@charset "UTF-8";

:root {
  /* =========================================================================
     PTNK Hub · Design Tokens (Theo đúng 100% DESIGN.md & NhanDienPTNK.css)
     ========================================================================= */

  /* Colors (Màu sắc chuẩn DESIGN.md:4-28) */
  --mau-thuong-hieu: #1A4A92;
  --mau-thuong-hieu-hover: #174790;
  --mau-thuong-hieu-nhan: #123A78;
  --mau-xanh-sang: #3F87C7;
  --mau-xanh-phu: #2268A6;
  --mau-nen-nhat: #E3F4FD;
  --mau-nen-trang: #FFFFFF;
  --mau-nen-trang-phu: #F7FAFD;
  --mau-nen-chon: #ECF3FA;
  --mau-chu-chinh: #142B47;
  --mau-chu-phu: #52647A;
  --mau-chu-tren-xanh: #FFFFFF;
  --mau-vien-nhe: #D8E4F0;
  --mau-vien-dieu-khien: #7F94AE;
  --mau-nen-chan-trang: #174790;
  --mau-nen-toi: #08244D;
  --mau-thanh-cong: #176B4A;
  --mau-nen-thanh-cong: #ECF8F1;
  --mau-canh-bao: #8A4B0F;
  --mau-nen-canh-bao: #FFF6E8;
  --mau-loi: #B42332;
  --mau-nen-loi: #FFF1F2;
  --mau-vo-hieu: #E8EDF3;
  --mau-chu-vo-hieu: #617187;

  /* Typography (Chuẩn DESIGN.md:29-49 & NhanDienPTNK.css:46-60) */
  --phong-chu: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  --chu-noi-bat: 48px;
  --chu-tieu-de: 32px;
  --chu-nhom: 24px;
  --chu-the: 20px;
  --chu-noi-dung: 16px;
  --chu-nhan: 14px;
  --chu-chu-thich: 12px;
  --dong-noi-bat: 1.15;
  --dong-noi-dung: 1.6;
  --net-thuong: 400;
  --net-vua: 600;
  --net-dam: 700;
  --rong-noi-dung: 1200px;
  --rong-doan-van: 65ch;

  /* Bo góc (Rounded chuẩn DESIGN.md:50-55 & NhanDienPTNK.css:28-32) */
  --bo-nho: 8px;
  --bo-dieu-khien: 12px;
  --bo-the: 16px;
  --bo-noi-bat: 24px;
  --bo-nhan: 9999px;

  /* Khoảng cách (Spacing chuẩn DESIGN.md:56-69 & NhanDienPTNK.css:33-45) */
  --cach-0: 0px;
  --cach-4: 4px;
  --cach-8: 8px;
  --cach-12: 12px;
  --cach-16: 16px;
  --cach-20: 20px;
  --cach-24: 24px;
  --cach-32: 32px;
  --cach-40: 40px;
  --cach-48: 48px;
  --cach-64: 64px;
  --cach-80: 80px;
  --cach-96: 96px;

  --le-trang: 32px;
  --dem-panel: 32px;
  --dem-the: 24px;
  --cach-nhom: 24px;
  --cach-phan: 80px;
  --cao-dieu-khien: 48px;
  --co-bieu-tuong: 20px;
  --net-bieu-tuong: 1.75;

  /* Elevation Shadows (Bóng chuẩn DESIGN.md:131-136 & NhanDienPTNK.css:69-70) */
  --bong-nhe: 0 2px 8px rgb(8 36 77 / 6%);
  --bong-noi: 0 4px 8px rgb(8 36 77 / 10%);

  /* Motion & Transitions (Chuẩn DESIGN.md:135 & NhanDienPTNK.css:71-73) */
  --thoi-gian-nhanh: 160ms;
  --thoi-gian-thuong: 200ms;
  --nhip-chuyen: cubic-bezier(0.16, 1, 0.3, 1);

  /* Focus (Chuẩn DESIGN.md:119 & NhanDienPTNK.css:74-75) */
  --vien-tap-trung: 3px solid var(--mau-thuong-hieu);
  --le-tap-trung: 3px;

  /* Lớp hiển thị (Layers chuẩn NhanDienPTNK.css:76-80) */
  --lop-thanh-dieu-huong: 10;
  --lop-danh-sach-noi: 20;
  --lop-nen-hop-thoai: 30;
  --lop-hop-thoai: 40;
  --lop-thong-bao: 50;

  /* =========================================================================
     Ánh xạ tương thích biến nội bộ (Internal Semantic Mapping - 100% DESIGN.md)
     ========================================================================= */
  --brand-primary: var(--mau-thuong-hieu);
  --brand-950: var(--mau-nen-toi);
  --brand-900: var(--mau-thuong-hieu-nhan);
  --brand-850: #153E7E;
  --brand-800: var(--mau-thuong-hieu-hover);
  --brand-700: var(--mau-thuong-hieu);
  --brand-600: var(--mau-xanh-phu);
  --brand-500: var(--mau-xanh-sang);
  --brand-400: #5FA1D8;
  --brand-300: #90C3EB;
  --brand-200: #C2E0F6;
  --brand-100: var(--mau-nen-nhat);
  --brand-50:  var(--mau-nen-chon);

  --ink: var(--mau-chu-chinh);
  --ink-2: #243B5A;
  --ink-muted: var(--mau-chu-phu);
  --ink-subtle: var(--mau-chu-vo-hieu);
  --line-subtle: #EDF3F9;
  --line: var(--mau-vien-nhe);
  --line-strong: var(--mau-vien-dieu-khien);
  --surface: var(--mau-nen-trang);
  --surface-2: var(--mau-nen-trang-phu);
  --surface-3: var(--mau-nen-chon);
  --surface-blue: var(--mau-nen-nhat);

  --success: var(--mau-thanh-cong);
  --success-bg: var(--mau-nen-thanh-cong);
  --success-border: #A7F3D0;
  --warning: var(--mau-canh-bao);
  --warning-bg: var(--mau-nen-canh-bao);
  --warning-border: #FDE68A;
  --danger: var(--mau-loi);
  --danger-bg: var(--mau-nen-loi);
  --danger-border: #FECACA;
  --info: #0284C7;
  --info-bg: #F0F9FF;
  --info-border: #BAE6FD;

  /* Shadows mapped directly to DESIGN.md */
  --shadow-xs: 0 1px 2px 0 rgb(8 36 77 / 4%);
  --shadow-sm: var(--bong-nhe);
  --shadow-md: var(--bong-noi);
  --shadow-lg: 0 8px 16px -2px rgb(8 36 77 / 10%), 0 4px 6px -2px rgb(8 36 77 / 6%);
  --shadow-xl: 0 16px 24px -4px rgb(8 36 77 / 12%), 0 8px 10px -4px rgb(8 36 77 / 6%);
  --shadow-card-hover: 0 4px 12px -2px rgb(8 36 77 / 10%), 0 2px 4px -1px rgb(8 36 77 / 5%);

  /* Radii mapped directly to DESIGN.md */
  --radius-xs: var(--bo-nho);
  --radius-sm: var(--bo-dieu-khien);
  --radius-md: var(--bo-dieu-khien);
  --radius: var(--bo-dieu-khien);
  --radius-lg: var(--bo-the);
  --radius-xl: var(--bo-noi-bat);
  --radius-pill: var(--bo-nhan);

  --container: var(--rong-noi-dung);
  --header-height: 74px;
  --sidebar-width: 268px;

  --ease: var(--nhip-chuyen);
  --transition-fast: var(--thoi-gian-nhanh) var(--nhip-chuyen);
  --transition-normal: var(--thoi-gian-thuong) var(--nhip-chuyen);
}

/* Responsive design tokens (DESIGN.md:83-92 & NhanDienPTNK.css:83-92) */
@media (max-width: 767px) {
  :root {
    --chu-noi-bat: 32px;
    --chu-tieu-de: 28px;
    --le-trang: 16px;
    --dem-panel: 24px;
    --dem-the: 16px;
    --cach-phan: 48px;
  }
}

/* Base resets & typography */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; overflow-x: hidden; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface-2);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a, select, input[type="checkbox"], input[type="radio"] { cursor: pointer; }
button:disabled, input:disabled, select:disabled {
  cursor: not-allowed;
  background: var(--mau-vo-hieu);
  color: var(--mau-chu-vo-hieu);
  border-color: var(--mau-vien-nhe);
  opacity: 1;
}

:focus-visible {
  outline: var(--vien-tap-trung);
  outline-offset: var(--le-tap-trung);
}

/* High-contrast focus indicators for dark backgrounds (WCAG 2.4.11 / 1.4.11 >= 7:1) */
.utility-bar a:focus-visible,
.hero a:focus-visible,
.hero button:focus-visible,
.hero-compact a:focus-visible,
.hero-compact button:focus-visible,
.hero-masthead a:focus-visible,
.hero-masthead button:focus-visible,
.site-footer a:focus-visible,
.site-footer button:focus-visible,
.btn-primary:focus-visible,
.filter-pill[aria-pressed="true"]:focus-visible,
.filter-pill.active:focus-visible,
.amount-highlight button:focus-visible,
.auth-submit:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 3px;
}

/* Accessibility utilities (WCAG 2.1) */
.visually-hidden,
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Accessibility Reduced Motion (WCAG 2.3.3 / 2.2.2) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Accessibility Skip Link (ẩn hoàn toàn, chỉ hiện khi focus) */
.skip-link {
  position: absolute;
  top: -9999px;
  left: -9999px;
  z-index: 9999;
  padding: 10px 18px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  color: #ffffff;
  background: var(--brand-900);
  border-radius: var(--bo-dieu-khien);
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
  transition: none;
}
.skip-link:focus {
  top: 14px;
  left: 14px;
  outline: 3px solid #ffffff;
  outline-offset: 3px;
}

/* Structural layout (DESIGN.md:97 - container 1200px, lề trang 32px / 16px) */
.container { width: min(calc(100% - var(--le-trang) * 2), var(--rong-noi-dung)); margin-inline: auto; }
.container-wide { width: min(calc(100% - var(--le-trang) * 2), 1400px); margin-inline: auto; }
.page { padding: 32px 0 72px; }
.page-space { padding-block: 28px 64px; }
.section { margin-top: 36px; }
.section + .section { margin-top: 44px; }

/* Top utility bar (PTNK Light Institutional Scheme - DESIGN.md:109) */
.utility-bar {
  background: var(--brand-100);
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.utility-bar .container {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.utility-brand-text { display: flex; align-items: center; gap: 8px; }
.utility-brand-text span { color: var(--ink); font-weight: 600; }
.utility-brand-text strong { color: var(--brand-700); font-weight: 700; }
.utility-links { display: flex; gap: 20px; align-items: center; }
.utility-links a {
  color: var(--brand-700);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 6px;
  font-weight: 600;
}
.utility-links a:hover { color: var(--brand-900); }

/* Header & Main navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 3px 0 rgb(8 36 77 / 4%);
}
.site-header .container {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
  min-height: 44px;
}
.brand-lockup img {
  height: 44px;
  width: auto;
  object-fit: contain;
  display: block;
}
.brand-hub-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  background: var(--mau-nen-nhat);
  color: var(--mau-thuong-hieu);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: var(--bo-nho);
  line-height: 1.2;
}

/* Site Navigation (Phẳng, thanh lịch, chuẩn LMS/SaaS DESIGN.md) */
.site-nav,
.nav-pill-dock,
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-inline: auto;
  flex-shrink: 0;
}
.nav-link,
.dock-link,
.main-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 16px;
  color: var(--mau-chu-phu);
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
  border-radius: var(--bo-dieu-khien);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.nav-link svg,
.dock-link svg,
.main-nav a svg {
  width: 16px;
  height: 16px;
  color: var(--mau-chu-phu);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}
.nav-link:hover,
.dock-link:hover,
.main-nav a:hover {
  color: var(--mau-thuong-hieu);
  background: var(--mau-nen-chon);
}
.nav-link:hover svg,
.dock-link:hover svg,
.main-nav a:hover svg {
  color: var(--mau-thuong-hieu);
}
.nav-link.active,
.nav-link[aria-current="page"],
.dock-link[aria-current="page"],
.main-nav a[aria-current="page"] {
  color: var(--mau-thuong-hieu);
  background: var(--mau-nen-nhat);
  font-weight: 700;
}
.nav-link.active svg,
.nav-link[aria-current="page"] svg,
.dock-link[aria-current="page"] svg,
.main-nav a[aria-current="page"] svg {
  color: var(--mau-thuong-hieu);
}
.nav-link.active::after,
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 16px;
  right: 16px;
  height: 2px;
  background-color: var(--mau-thuong-hieu);
  border-radius: var(--bo-nhan);
}

.header-actions { display: flex; align-items: center; gap: 12px; }

/* User chip in header */
.account-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 8px;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-fast);
}
.account-chip:hover {
  background: var(--brand-50);
  border-color: var(--brand-200);
}
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-800), var(--brand-600));
  font-size: 12px;
  font-weight: 700;
  box-shadow: var(--shadow-xs);
}
.avatar-sm {
  width: 26px;
  height: 26px;
  font-size: 12px;
}

/* Buttons (DESIGN.md:71-78, 147 - chiều cao 48px, bo góc 12px, padding 12px 24px) */
.btn {
  min-height: var(--cao-dieu-khien);
  padding: 12px 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--bo-dieu-khien);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.3;
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform 80ms ease;
  user-select: none;
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn svg { width: var(--co-bieu-tuong); height: var(--co-bieu-tuong); flex-shrink: 0; stroke-width: var(--net-bieu-tuong); }

.btn-primary {
  color: #ffffff;
  background: var(--mau-thuong-hieu);
  border-color: var(--mau-thuong-hieu);
  box-shadow: var(--bong-nhe);
}
.btn-primary:hover {
  background: var(--mau-thuong-hieu-hover);
  border-color: var(--mau-thuong-hieu-hover);
  box-shadow: var(--bong-noi);
}
.btn-primary:active {
  background: var(--mau-thuong-hieu-nhan);
  border-color: var(--mau-thuong-hieu-nhan);
}
.btn-secondary {
  color: var(--mau-thuong-hieu);
  background: #ffffff;
  border-color: var(--mau-vien-dieu-khien);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  color: var(--mau-thuong-hieu-hover);
  border-color: var(--mau-thuong-hieu);
  background: var(--mau-nen-chon);
}
.btn-light {
  color: var(--mau-thuong-hieu);
  background: #ffffff;
  border-color: #ffffff;
  box-shadow: var(--bong-nhe);
}
.btn-light:hover {
  background: var(--mau-nen-chon);
  color: var(--mau-thuong-hieu-hover);
}
.btn-quiet {
  color: inherit;
  background: transparent;
  border-color: transparent;
}
.btn-quiet:hover {
  background: var(--mau-nen-chon);
  color: var(--mau-thuong-hieu);
}
.btn-danger {
  color: #ffffff;
  background: var(--danger);
  border-color: var(--danger);
}
.btn-danger:hover {
  background: var(--danger);
}
.btn-danger-outline {
  color: var(--danger);
  background: #ffffff;
  border-color: var(--danger-border);
}
.btn-danger-outline:hover {
  background: var(--danger-bg);
  border-color: var(--danger);
}
.btn-sm {
  min-height: 44px;
  padding: 8px 16px;
  font-size: 14px;
  border-radius: var(--radius-xs);
}
.btn-lg {
  min-height: 48px;
  padding: 12px 24px;
  font-size: 16px;
  border-radius: var(--radius-md);
}
.btn-block { width: 100%; }

/* Academic Masthead (PTNK Hub Style: Mềm mại, sáng rõ, uy tín) */
.hero-masthead {
  position: relative;
  overflow: hidden;
  border-radius: var(--bo-noi-bat);
  background: linear-gradient(135deg, var(--brand-900) 0%, var(--brand-700) 65%, var(--brand-600) 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--bong-nhe);
  margin-bottom: 32px;
}
.hero-masthead-inner {
  padding: 40px 44px;
  max-width: 860px;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 2;
}
.hero-badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.hero-org-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #e3f4fd;
  font-size: 14px;
  font-weight: 600;
}
.hero-org-badge svg {
  width: 16px;
  height: 16px;
  color: var(--brand-300);
  flex-shrink: 0;
}
.hero-term-pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--bo-nhan);
  font-size: 12px;
  font-weight: 600;
  color: #ffffff;
}
.hero-title {
  margin: 0 0 16px;
  font-size: var(--chu-noi-bat);
  line-height: var(--dong-noi-bat);
  font-weight: var(--net-dam);
  letter-spacing: -0.02em;
  color: #ffffff;
  text-wrap: balance;
}
.hero-desc {
  max-width: var(--rong-doan-van);
  margin: 0 0 24px;
  color: var(--brand-50);
  font-size: var(--chu-noi-dung);
  line-height: var(--dong-noi-dung);
  text-wrap: pretty;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.btn-hero {
  min-height: var(--cao-dieu-khien);
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 650;
  border-radius: var(--bo-dieu-khien);
}
.hero-meta-strip {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--brand-200);
}
.hero-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.hero-meta-item svg {
  width: 14px;
  height: 14px;
  color: var(--brand-300);
  flex-shrink: 0;
}
.hero-meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
}

/* Listing Control Panel (Hợp nhất khối tìm kiếm & bộ lọc, không chia 4 tầng) */
.listing-control-panel {
  margin-bottom: 32px;
}
.listing-control-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.listing-main-heading {
  margin: 0 0 6px;
  font-size: 32px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--mau-chu-chinh);
  display: flex;
  align-items: center;
  gap: 10px;
}
.listing-main-heading svg {
  color: var(--mau-thuong-hieu);
}
.listing-sub-heading {
  margin: 0;
  font-size: 14px;
  color: var(--mau-chu-phu);
}
.listing-count-text {
  font-size: 14px;
  color: var(--mau-chu-phu);
}
.listing-count-text strong {
  color: var(--mau-thuong-hieu);
  font-weight: 700;
}
.unified-filter-card {
  background: var(--mau-nen-trang);
  border: none;
  border-radius: var(--bo-the);
  padding: 24px;
  box-shadow: var(--bong-nhe);
}
.unified-search-bar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}
.unified-input-wrap {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}
.unified-input-wrap .search-icon {
  position: absolute;
  left: 16px;
  color: var(--mau-chu-phu);
  pointer-events: none;
}
.unified-search-input {
  width: 100%;
  min-height: var(--cao-dieu-khien);
  padding: 12px 44px 12px 46px;
  border: 1px solid var(--mau-vien-dieu-khien);
  border-radius: var(--bo-dieu-khien);
  font-size: 16px;
  color: var(--mau-chu-chinh);
  background: #ffffff;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.unified-search-input:focus {
  border-color: var(--mau-thuong-hieu);
  outline: var(--vien-tap-trung);
  outline-offset: var(--le-tap-trung);
}
.search-kbd-hint {
  position: absolute;
  right: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  color: var(--mau-chu-phu);
  background: var(--mau-nen-chon);
  border: 1px solid var(--mau-vien-dieu-khien);
  border-radius: var(--bo-nho);
  box-shadow: 0 1px 1px rgba(8, 36, 77, 0.08);
  pointer-events: none;
  user-select: none;
}
@media (max-width: 768px) {
  .search-kbd-hint {
    display: none;
  }
}
.subject-pills-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.subject-pills-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--mau-chu-phu);
  white-space: nowrap;
}
.subject-pills-scroll {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.btn-clear-filters {
  white-space: nowrap;
  min-height: var(--cao-dieu-khien);
  padding: 10px 16px;
  font-size: 14px;
}

/* Page titles, section headings, breadcrumbs */
.page-title {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.page-lead {
  max-width: 68ch;
  margin: 8px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 1.55;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}
.section-head h2, .panel-head h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-head p, .panel-head p {
  margin: 4px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
}
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--ink-muted);
  font-size: 14px;
}
.breadcrumbs a {
  color: var(--brand-700);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 44px;
  min-height: 44px;
  justify-content: center;
  padding: 4px 6px;
  border-radius: var(--radius-xs);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.breadcrumbs a:hover { color: var(--brand-900); background: var(--surface-3); text-decoration: none; }
.breadcrumbs a svg { width: 14px; height: 14px; }
.breadcrumbs-sep { color: var(--ink-subtle); }

/* Toolbars & Form Controls */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
}
.filter-pills-wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.filter-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-muted);
  margin-right: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
/* Filter Pills (DESIGN.md:141, 149 - bo góc 9999px, viền điều khiển, màu thương hiệu) */
.filter-pill {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 16px;
  border-radius: var(--bo-nhan);
  font-size: 14px;
  font-weight: 600;
  color: var(--mau-thuong-hieu);
  background: #ffffff;
  border: 1px solid var(--mau-vien-dieu-khien);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.filter-pill:hover {
  border-color: var(--mau-thuong-hieu);
  color: var(--mau-thuong-hieu-hover);
  background: var(--mau-nen-chon);
}
.filter-pill.active,
.filter-pill[aria-pressed="true"] {
  background: var(--mau-thuong-hieu);
  color: #ffffff;
  border-color: var(--mau-thuong-hieu);
  box-shadow: var(--bong-nhe);
}
.pill-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 6px;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  background: var(--surface-2);
  color: var(--ink-muted);
}
.filter-pill.active .pill-count {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
}
.pill-icon {
  margin-right: 6px;
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  opacity: 0.8;
}
.filter-pill:hover .pill-icon,
.filter-pill.active .pill-icon {
  opacity: 1;
}

.field { display: grid; gap: 6px; }
.field label {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 600;
}

/* ASP.NET Core Validation Summary */
.validation-summary-valid { display: none !important; }
.validation-summary-errors {
  padding: 12px 16px;
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  border-radius: var(--radius-sm);
  color: var(--danger);
  font-size: 14px;
  margin-bottom: 16px;
}
.validation-summary-errors ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.validation-summary-errors li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-field { flex: 1 1 320px; }
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-icon {
  position: absolute;
  left: 14px;
  width: 17px;
  height: 17px;
  color: var(--ink-muted);
  pointer-events: none;
}
.input, .select, .textarea {
  width: 100%;
  min-height: var(--cao-dieu-khien);
  padding: 12px 16px;
  color: var(--mau-chu-chinh);
  background: #ffffff;
  border: 1px solid var(--mau-vien-dieu-khien);
  border-radius: var(--bo-dieu-khien);
  font-size: 16px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input-has-icon { padding-left: 44px; }
.textarea { min-height: 108px; resize: vertical; line-height: 1.5; }
.input::placeholder, .textarea::placeholder { color: var(--mau-chu-phu); }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--mau-thuong-hieu);
  outline: var(--vien-tap-trung);
  outline-offset: var(--le-tap-trung);
}
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  color: var(--ink-2);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-fast);
}
.filter-chip:hover {
  border-color: var(--brand-600);
  color: var(--brand-800);
  background: var(--brand-50);
}
.filter-chip[aria-current="true"] {
  color: var(--brand-900);
  background: var(--brand-100);
  border-color: var(--brand-600);
}

/* =========================================================================
   SUBJECT CATALOG & STRUCTURED CLASS ROWS (DESIGN.md: Nhóm theo môn, hàng học vụ)
   ========================================================================= */
.subject-catalog {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-top: 24px;
}
.subject-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.subject-section:hover {
  border-color: var(--brand-300);
}
.subject-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 24px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
.subject-title-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.subject-badge-line {
  display: flex;
  align-items: center;
  gap: 8px;
}
.subject-tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--brand-100);
  color: var(--brand-800);
  border-radius: var(--radius-xs);
  border: 1px solid var(--brand-200);
}
.subject-class-count {
  font-size: 12px;
  color: var(--ink-muted);
  font-weight: 550;
}
.subject-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.01em;
}
.subject-thumb-wrap {
  width: 140px;
  height: 75px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
  flex-shrink: 0;
  background: var(--surface-3);
}
.subject-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Container danh sách lớp học */
.class-rows-container {
  display: flex;
  flex-direction: column;
}
.class-item-row {
  display: grid;
  grid-template-columns: 2.2fr 1.6fr 1.1fr auto;
  align-items: center;
  gap: 20px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--line-subtle);
  background: var(--surface);
  transition: background-color var(--transition-fast);
}
.class-item-row:last-child {
  border-bottom: none;
}
.class-item-row:hover {
  background-color: rgba(26, 74, 146, 0.025);
}

/* Cột thông tin chính của lớp */
.class-main-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.class-meta-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12px;
}
.class-code-badge {
  font-weight: 700;
  color: var(--brand-800);
  background: var(--brand-50);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--brand-200);
  font-family: var(--font-mono);
  font-size: 12px;
}
.meta-dot-sep {
  color: var(--line-strong);
  font-weight: bold;
}
.class-term-label {
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 500;
}
.modality-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.2;
}
.tag-online {
  background: var(--brand-100);
  color: var(--brand-600);
  border: 1px solid var(--brand-200);
}
.tag-offline {
  background: var(--brand-50);
  color: var(--brand-800);
  border: 1px solid var(--brand-200);
}
.class-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
}
.class-title a {
  color: var(--ink);
  text-decoration: none;
  transition: color var(--transition-fast);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.class-title a:hover {
  color: var(--brand-700);
  text-decoration: underline;
}

/* Cột lịch học & giảng viên */
.class-schedule-col {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 14px;
  color: var(--ink-2);
}
.class-info-line {
  display: flex;
  align-items: center;
  gap: 7px;
}
.info-icon {
  color: var(--brand-600);
  flex-shrink: 0;
}
.schedule-text {
  font-weight: 600;
  color: var(--ink);
}
.teacher-line {
  color: var(--ink-muted);
  font-size: 12px;
}

/* Cột học phí dạng số liệu kế toán */
.class-pricing-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  text-align: right;
}
.price-figure {
  font-size: 16px;
  font-weight: 800;
  color: var(--brand-900);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}
.price-subtext {
  font-size: 12px;
  color: var(--ink-muted);
  margin-top: 2px;
}

/* Cột hành động xem chi tiết */
.class-action-col {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.class-detail-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 650;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: all var(--transition-fast);
}
.class-detail-btn svg {
  transition: transform var(--transition-fast);
}
.class-detail-btn:hover svg {
  transform: translateX(3px);
}

/* Badges with dot indicator */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 24px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  width: fit-content;
  white-space: nowrap;
}
.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.badge-blue { color: var(--brand-800); background: var(--brand-100); border: 1px solid var(--brand-200); }
.badge-green { color: var(--success); background: var(--success-bg); border: 1px solid var(--success-border); }
.badge-warning { color: var(--warning); background: var(--warning-bg); border: 1px solid var(--warning-border); }
.badge-danger { color: var(--danger); background: var(--danger-bg); border: 1px solid var(--danger-border); }
.badge-neutral { color: var(--ink-2); background: var(--surface-3); border: 1px solid var(--line); }

/* Panels & Cards */
.panel {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  min-width: 0;
  max-width: 100%;
}
.panel + .panel { margin-top: 20px; }
.panel-head {
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.panel-body { padding: 22px; min-width: 0; }
.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 370px;
  gap: 24px;
  align-items: start;
  min-width: 0;
  max-width: 100%;
}
.two-column > * {
  min-width: 0;
  max-width: 100%;
}
.sticky { position: sticky; top: calc(var(--header-height) + 20px); }

/* =========================================================================
   COURSE DETAIL PAGE (DESIGN.md: Tinh tế, Học thuật, Rõ ràng)
   ========================================================================= */

/* Hero khối tổng quan lớp học */
.course-detail-hero {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 28px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  box-shadow: var(--shadow-xs);
  margin-top: 16px;
}
.course-hero-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}
.course-hero-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.badge-term {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-muted);
  background: var(--surface-2);
  padding: 3px 9px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--line);
}
.course-hero-title {
  font-size: 24px;
  font-weight: 850;
  color: var(--ink);
  margin: 0;
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.course-hero-facts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  font-size: 14px;
  color: var(--ink-2);
  margin-top: 2px;
}
.hero-fact-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.fact-label {
  color: var(--ink-muted);
  font-weight: 500;
}
.fact-val {
  font-weight: 650;
  color: var(--ink);
}
.course-hero-media {
  width: 280px;
  height: 160px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  flex-shrink: 0;
  background: var(--surface-3);
}
.course-hero-banner {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Quick CTA trong Hero khi ở mobile */
.course-hero-mobile-cta {
  display: none;
  flex-direction: column;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line-subtle);
  margin-top: 8px;
}
.mobile-cta-price {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.mobile-cta-price .price-label {
  font-size: 14px;
  color: var(--ink-muted);
  font-weight: 500;
}
.mobile-cta-price .price-value {
  font-size: 20px;
  font-weight: 800;
  color: var(--brand-900);
}

/* Spacing and typography utilities */
.mt-0 { margin-top: 0 !important; }
.mb-2 { margin-bottom: 8px !important; }
.mb-3 { margin-bottom: 12px !important; }
.mb-5 { margin-bottom: 20px !important; }
.mb-6 { margin-bottom: 24px !important; }
.mt-5 { margin-top: 20px !important; }

/* Phần hiển thị Lịch học */
.course-main-content {
  min-width: 0;
}
.schedule-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  box-shadow: var(--shadow-xs);
}
.section-sub-head {
  margin-bottom: 20px;
}
.section-sub-head h2 {
  font-size: 18px;
  font-weight: 750;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}
.section-sub-head h2 svg {
  color: var(--brand-700);
  flex-shrink: 0;
}
.term-dates-callout {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--brand-50);
  border: 1px solid var(--brand-200);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--brand-900);
  margin-bottom: 20px;
}
.term-dates-callout svg {
  color: var(--brand-700);
  flex-shrink: 0;
}
.schedule-table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 14px;
}
.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}
.schedule-table th {
  background: var(--surface-2);
  padding: 12px 18px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--line);
}
.schedule-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-subtle);
  color: var(--ink);
}
.schedule-table tbody tr:last-child td {
  border-bottom: none;
}
.schedule-table .schedule-hours {
  font-weight: 650;
  color: var(--brand-900);
}
.schedule-table .schedule-duration {
  color: var(--ink-muted);
}
.schedule-note {
  font-size: 12px;
  color: var(--ink-muted);
  font-style: italic;
  margin: 14px 0 0;
  line-height: 1.45;
}

/* Thẻ đăng ký cố định bên sidebar */
.course-sidebar-col {
  min-width: 0;
}
.enrollment-action-card {
  background: var(--surface);
  border: 1px solid var(--brand-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.action-card-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-subtle);
}
.action-card-subtitle {
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}
.action-card-price {
  font-size: 32px;
  font-weight: 850;
  color: var(--brand-900);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.action-card-caption {
  font-size: 12px;
  color: var(--ink-muted);
  margin-top: 2px;
}
.enrollment-policy-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 4px;
}
.policy-item {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  color: var(--ink-2);
}
.policy-icon {
  color: var(--brand-600);
  flex-shrink: 0;
}

/* Thanh hành động cố định đáy màn hình trên Mobile */
.mobile-sticky-action {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--line);
  padding: 10px 16px;
  box-shadow: 0 -4px 16px rgb(8 36 77 / 8%);
  z-index: 100;
}
.mobile-sticky-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 600px;
  margin: 0 auto;
}
.mobile-sticky-price {
  display: flex;
  flex-direction: column;
}
.sticky-price-label {
  font-size: 12px;
  color: var(--ink-muted);
  font-weight: 500;
}
.sticky-price-amount {
  font-size: 18px;
  font-weight: 850;
  color: var(--brand-900);
  line-height: 1.2;
}
.mobile-sticky-btn {
  min-height: 42px;
  padding: 8px 18px;
  font-weight: 700;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Authentication panel */
.auth-panel {
  max-width: 440px;
  margin: 48px auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 36px 32px;
}
.auth-header {
  text-align: center;
  margin-bottom: 24px;
}
.auth-icon-badge {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--brand-50);
  color: var(--brand-700);
  display: grid;
  place-items: center;
  margin: 0 auto 14px;
  border: 1px solid var(--brand-100);
}
.auth-title {
  font-size: 24px !important;
  margin-bottom: 0 !important;
}
.auth-lead {
  margin-top: 6px !important;
}
.auth-submit {
  margin-top: 12px;
}
.auth-footer-help {
  text-align: center;
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.5;
}

/* Summary List */
.summary-list { list-style: none; padding: 0; margin: 0; }
.summary-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-subtle);
  font-size: 14px;
}
.summary-list li:last-child { border-bottom: 0; }
.summary-list span { color: var(--ink-muted); }
.summary-list strong { color: var(--ink); font-weight: 600; }
.summary-total {
  margin-top: 14px;
  padding-top: 16px;
  border-top: 2px solid var(--brand-100);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
}
.summary-total span { font-size: 14px; font-weight: 600; color: var(--ink-2); }
.summary-total strong { color: var(--brand-900); font-size: 24px; font-weight: 800; }

/* Notice / Status alerts */
.notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  color: var(--ink);
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.5;
}
.notice svg { width: 20px; height: 20px; color: var(--info); flex-shrink: 0; margin-top: 1px; }
.notice.warning { background: var(--warning-bg); border-color: var(--warning-border); }
.notice.warning svg { color: var(--warning); }
.notice.danger { background: var(--danger-bg); border-color: var(--danger-border); }
.notice.danger svg { color: var(--danger); }
.notice.success { background: var(--success-bg); border-color: var(--success-border); }
.notice.success svg { color: var(--success); }

/* Payment & QR Box */
.payment-layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 24px;
}
.qr-box {
  padding: 26px 20px;
  text-align: center;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.qr-frame {
  display: inline-block;
  padding: 14px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin-bottom: 14px;
}
.qr-frame img { border-radius: var(--bo-nho); display: block; }
.qr-box p { margin: 0; font-size: 14px; color: var(--ink-muted); }
.bank-detail { display: grid; gap: 0; }
.bank-detail-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-subtle);
}
.bank-detail-row:last-child { border-bottom: 0; }
.bank-detail-label { color: var(--ink-muted); font-size: 14px; }
.bank-detail-value-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}
.bank-detail-value {
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  word-break: break-all;
}
.btn-copy {
  position: relative;
  min-height: 44px;
  min-width: 44px;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-700);
  background: var(--brand-50);
  border: 1px solid var(--brand-200);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition-fast);
}
.btn-copy:hover {
  background: var(--brand-100);
  border-color: var(--brand-600);
  color: var(--brand-900);
}
.btn-copy:focus-visible {
  outline: 3px solid var(--brand-700);
  outline-offset: 2px;
}
.amount-highlight {
  margin: 20px 0;
  padding: 20px 22px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand-950) 0%, var(--brand-800) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  box-shadow: var(--shadow-md);
}
.amount-highlight-label { color: var(--brand-200); font-size: 14px; font-weight: 500; }
.amount-highlight-value { font-size: 32px; font-weight: 800; }

/* Modern Enterprise Data Table */
.table-wrap {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow-xs);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 540px;
}
.data-table th, .data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
.data-table th {
  color: var(--ink-2);
  background: var(--surface-2);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.data-table tbody tr {
  transition: background-color var(--transition-fast);
}
.data-table tbody tr:hover {
  background: var(--brand-50);
}
.data-table tr:last-child td { border-bottom: 0; }

/* Empty state */
.empty-state {
  padding: 56px 24px;
  text-align: center;
  background: #ffffff;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.empty-state svg {
  width: 44px;
  height: 44px;
  color: var(--ink-subtle);
  margin-bottom: 16px;
}
.empty-state h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}
.empty-state p {
  max-width: 48ch;
  margin: 8px 0 20px;
  color: var(--ink-muted);
  font-size: 14px;
}

/* =========================================================================
   ADMIN LAYOUT & SHELL
   ========================================================================= */
.admin-body { background: var(--surface-2); }
.admin-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

/* Sidebar */
.admin-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--brand-950);
  color: var(--brand-100);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  overflow-y: auto;
}
.admin-brand {
  min-height: 74px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}
.admin-brand img {
  height: 42px;
  width: auto;
}
.admin-nav {
  padding: 16px 12px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.admin-nav-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.admin-nav-group-title {
  padding: 6px 12px 4px;
  color: var(--brand-400);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.admin-nav a {
  min-height: 40px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--brand-200);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-fast);
}
.admin-nav a svg {
  width: 18px;
  height: 18px;
  color: var(--brand-400);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}
.admin-nav a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}
.admin-nav a:hover svg { color: #ffffff; }
.admin-nav a[aria-current="page"] {
  color: #ffffff;
  background: var(--brand-700);
  box-shadow: 0 1px 3px rgb(8 36 77 / 20%);
}
.admin-nav a[aria-current="page"] svg { color: #ffffff; }

.admin-sidebar-footer {
  margin-top: auto;
  padding: 16px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 12px;
  color: var(--brand-300);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.admin-portal-link {
  color: #ffffff;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.admin-portal-link:hover { text-decoration: underline; }

/* Admin Main Content */
.admin-main { min-width: 0; display: flex; flex-direction: column; }
.admin-topbar {
  min-height: 64px;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}
.admin-topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-muted);
}
.admin-topbar-breadcrumb strong { color: var(--ink); font-weight: 700; }
.admin-topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.admin-user-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 12px 5px 6px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.admin-content { padding: 28px; flex: 1; }
.admin-page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}
.admin-page-head h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.015em;
}
.admin-page-head p {
  margin: 6px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
}

/* Metric cards in admin */
.metric-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.metric {
  padding: 18px 20px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
}
.metric span {
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
  font-weight: 800;
  color: var(--brand-900);
  line-height: 1.15;
}
.metric em {
  display: block;
  margin-top: 6px;
  color: var(--ink-muted);
  font-size: 12px;
  font-style: normal;
}

/* Forms in Admin: Modern Tabbed or Clean Cards */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.form-grid .span-2 { grid-column: 1 / -1; }
.form-card {
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
  margin-bottom: 20px;
}
.form-card-title {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 700;
  color: var(--brand-900);
  display: flex;
  align-items: center;
  gap: 8px;
}
.form-card-title svg { width: 18px; height: 18px; color: var(--brand-700); }

/* Auth page helper rules */
.auth-panel .page-title { text-align: center; }
.auth-panel .page-lead { text-align: center; margin-bottom: 24px; }
.auth-panel form { display: grid; gap: 18px; }

/* Toast Feedback */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  padding: 12px 18px;
  background: var(--brand-950);
  color: #ffffff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
  animation: toastIn 0.25s var(--ease);
}
.toast svg { width: 16px; height: 16px; color: var(--brand-400); }
@keyframes toastIn {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* =========================================================================
   ACADEMIC SHOWCASE SECTIONS (Journey, Distinction, Admissions)
   ========================================================================= */
.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 36px;
}
.section-sub-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--brand-50);
  border: 1px solid var(--brand-200);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  color: var(--brand-800);
  margin-bottom: 10px;
}
.section-main-title {
  font-size: 24px;
  font-weight: 850;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 10px;
  line-height: 1.3;
}
.section-lead-text {
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.55;
  margin: 0;
}

/* 4-Step Enrollment Process Stepper */
.enrollment-journey-section {
  margin-top: 48px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
}
.journey-stepper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.journey-step-item {
  display: flex;
  flex-direction: column;
  padding-top: 16px;
  border-top: 2px solid var(--line-strong);
  background: transparent;
}
.step-num-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--brand-800);
  color: #ffffff;
  font-size: 14px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  box-shadow: 0 2px 4px rgba(26, 74, 146, 0.22);
}
.step-content {
  display: flex;
  flex-direction: column;
}
.journey-step-item .step-title {
  font-size: 16px;
  font-weight: 750;
  color: var(--ink);
  margin: 0 0 6px;
  line-height: 1.3;
}
.journey-step-item .step-desc {
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.5;
  margin: 0;
}

/* Institutional Academic Distinction & Admissions Banner (Light academic block before dark footer) */
.institutional-admissions-banner {
  margin-top: 40px;
  padding: 36px 38px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-xs);
}
.institutional-banner-inner {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 36px;
  align-items: center;
}
.institutional-info {
  display: flex;
  flex-direction: column;
}
.institutional-badge {
  display: inline-flex;
  width: fit-content;
  padding: 4px 12px;
  background: var(--brand-50);
  border: 1px solid var(--brand-200);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 650;
  color: var(--brand-800);
  margin-bottom: 10px;
}
.institutional-title {
  font-size: 24px;
  font-weight: 850;
  color: var(--ink);
  margin: 0 0 10px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.institutional-desc {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.6;
  margin: 0 0 18px;
}
.institutional-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.highlight-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--bo-nho);
  font-size: 12px;
  font-weight: 550;
  color: var(--ink-2);
}
.highlight-chip svg {
  color: var(--success);
}
.institutional-helpline {
  display: flex;
  flex-direction: column;
  padding: 22px 24px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--bo-the);
}
.helpline-label {
  font-size: 12px;
  font-weight: 650;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.helpline-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 24px;
  background: var(--brand-700);
  color: #ffffff;
  border-radius: var(--bo-dieu-khien);
  font-size: 18px;
  font-weight: 850;
  text-decoration: none;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-fast);
  margin-bottom: 10px;
}
.helpline-cta-btn:hover {
  background: var(--brand-800);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.helpline-cta-btn svg {
  color: #ffffff;
}
.helpline-hours {
  font-size: 12px;
  color: var(--ink-muted);
  margin-bottom: 4px;
}
.helpline-email {
  font-size: 12px;
  color: var(--brand-700);
  font-weight: 600;
}

/* =========================================================================
   SITE FOOTER (PTNK Academic Identity - DESIGN.md:106, 111)
   ========================================================================= */
.site-footer {
  margin-top: var(--cach-phan);
  background: var(--mau-nen-chan-trang);
  color: #edf5fc;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 44px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1.1fr 0.85fr;
  gap: 36px;
  align-items: start;
  margin-bottom: 36px;
}
.footer-col {
  display: flex;
  flex-direction: column;
}
.footer-brand-lockup {
  display: inline-flex;
  align-items: center;
  margin: 0 0 16px 0;
  min-height: 44px;
}
.footer-logo-badge {
  display: inline-flex;
  align-items: center;
  background: #ffffff;
  padding: 4px 12px;
  border-radius: var(--bo-nho);
  box-shadow: var(--bong-nhe);
}
.footer-logo {
  height: 34px;
  width: auto;
  max-width: 210px;
  object-fit: contain;
  display: block;
}
.footer-desc {
  color: var(--brand-200);
  font-size: 14px;
  line-height: 1.55;
  margin: 0 0 16px;
  max-width: var(--rong-doan-van);
}
.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--bo-dieu-khien);
  font-size: 12px;
  font-weight: 600;
  color: var(--brand-200);
  width: fit-content;
}
.footer-badge svg {
  width: 14px;
  height: 14px;
  color: var(--mau-xanh-sang);
  flex-shrink: 0;
}
.footer-title,
.footer-col-title {
  margin: 0 0 16px 0;
  height: 44px;
  display: flex;
  align-items: center;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #ffffff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}
.campus-card {
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--bo-nho);
  margin-bottom: 10px;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.campus-card:hover {
  background: rgba(255, 255, 255, 0.10);
  border-color: rgba(255, 255, 255, 0.22);
}
.campus-name {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 3px;
}
.campus-address,
.campus-detail {
  font-size: 12px;
  color: #e3f4fd;
  line-height: 1.45;
  margin-bottom: 4px;
}
.campus-contact {
  font-size: 12px;
  font-weight: 600;
  color: #ffffff;
}
.footer-links-list {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links-list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #edf5fc;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition-fast), transform var(--transition-fast);
  padding: 6px 0;
  min-height: 44px;
}
.footer-links-list a:hover {
  color: #ffffff;
  text-decoration: underline;
  transform: translateX(3px);
}
.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 12px;
  color: var(--brand-200);
}
.footer-copy {
  color: #edf5fc;
}
.footer-legal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.footer-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
}
.footer-top-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--info-border);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}
.footer-top-link:hover {
  color: #ffffff;
  text-decoration: underline;
}
.footer-top-link svg {
  width: 12px;
  height: 12px;
}

/* Fallback legacy footer-note if used elsewhere */
.footer-note {
  margin: 32px 0 0;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-brand { font-weight: 700; color: var(--brand-900); }

/* Mobile Utilities & Detail Actions */
.d-mobile-only { display: none; }
.mobile-sticky-action { display: none; }

/* Responsive adjustments */
@media (max-width: 1080px) {
  .hero,
  .hero-compact,
  .hero-masthead { grid-template-columns: 1fr; }
  .payment-layout { grid-template-columns: 1fr; }
  .two-column { grid-template-columns: minmax(0, 1fr); }
  .sticky { position: static; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .footer-col-brand {
    grid-column: 1 / -1;
  }
  .journey-stepper {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .institutional-banner-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .d-mobile-only { display: block; }
  .mobile-sticky-action {
    display: block;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 150;
    background: rgba(255, 255, 255, 0.98);
    border-top: 1px solid var(--line);
    box-shadow: 0 -4px 16px -2px rgb(8 36 77 / 8%);
    padding: 10px 16px;
    padding-bottom: max(10px, env(safe-area-inset-bottom));
  }
  .mobile-sticky-inner {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }
  .mobile-sticky-price {
    display: flex;
    flex-direction: column;
  }
  .sticky-price-label {
    font-size: 12px;
    color: var(--ink-muted);
    line-height: 1.2;
  }
  .sticky-price-amount {
    font-size: 18px;
    font-weight: 800;
    color: var(--brand-900);
    line-height: 1.2;
  }
  .mobile-sticky-btn {
    min-height: 44px;
    padding: 0 18px;
    font-weight: 700;
  }
  body:has(.mobile-sticky-action) {
    padding-bottom: 74px;
  }
}

@media (max-width: 860px) {
  .admin-shell { grid-template-columns: 1fr; }
  .admin-sidebar { position: static; height: auto; border-right: 0; }
  .admin-nav { flex-direction: row; flex-wrap: wrap; gap: 8px; }
  .admin-nav-group { flex-direction: row; flex-wrap: wrap; }
  .admin-nav-group-title { width: 100%; }
  .admin-sidebar-footer { display: none; }
}

@media (max-width: 880px) {
  .site-header .container {
    flex-wrap: wrap;
    padding: 10px 16px;
    min-height: auto;
  }
  .header-left {
    width: 100%;
    justify-content: space-between;
    margin-bottom: 6px;
  }
  .brand-lockup {
    justify-content: flex-start;
  }
  .header-actions {
    margin-left: auto;
  }
  .nav-pill-dock,
  .main-nav,
  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    margin-top: 8px;
    overflow-x: auto;
    padding: 4px 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
    justify-content: flex-start;
  }
  .nav-pill-dock::-webkit-scrollbar,
  .main-nav::-webkit-scrollbar,
  .site-nav::-webkit-scrollbar {
    display: none;
  }
  .dock-link,
  .main-nav a,
  .site-nav .nav-link {
    min-height: 44px;
    padding: 0 14px;
    font-size: 14px;
    white-space: nowrap;
    flex-shrink: 0;
  }
}

@media (max-width: 720px) {
  .container {
    width: 100%;
    padding-inline: 16px;
    box-sizing: border-box;
  }
  .page-space {
    padding-block: 16px 48px;
  }
  .panel-body {
    padding: 18px 16px;
  }
  .banner-photo {
    height: 150px;
    border-radius: var(--radius-sm);
    margin-bottom: 14px !important;
  }
  .page-title {
    font-size: 24px;
  }
  .utility-bar { display: none; }
  .filter-pills-wrap {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
    margin-inline: -12px;
    padding-inline: 12px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .filter-pills-wrap::-webkit-scrollbar {
    display: none;
  }
  .filter-pill {
    flex-shrink: 0;
    min-height: 44px;
    padding: 8px 14px;
  }
  .header-actions { margin-left: auto; }
  .site-header .btn-primary.btn-sm {
    min-height: 44px;
    padding: 8px 16px;
    font-size: 14px;
  }
  .hero-masthead-inner,
  .hero-compact-inner { padding: 28px 20px; }
  .hero-title { font-size: 32px; }
  .hero-compact h1 { font-size: 24px; }
  .admin-content { padding: 18px 14px; }
  .admin-topbar { padding: 0 16px; }
}

@media (max-width: 640px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn-hero {
    width: 100%;
    justify-content: center;
  }
  .journey-stepper {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .journey-step-item {
    padding-top: 14px;
  }
  .enrollment-journey-section {
    padding: 24px 0;
    margin-top: 32px;
  }
  .institutional-admissions-banner {
    padding: 24px 18px;
    margin-top: 32px;
  }
  .institutional-banner-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .institutional-title {
    font-size: 20px;
  }
  .helpline-cta-btn {
    width: 100%;
    justify-content: center;
    font-size: 16px;
  }
  .section-main-title {
    font-size: 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-brand-lockup {
    min-height: 44px;
    margin-bottom: 12px;
  }
  .footer-title,
  .footer-col-title {
    height: auto;
    margin-bottom: 12px;
  }
  .footer-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .filter-results-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  /* Subject catalog responsive layout */
  .subject-section-head {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 18px;
  }
  .subject-thumb-wrap {
    width: 100%;
    height: 110px;
  }
  .class-item-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 14px 16px;
  }
  .class-pricing-col {
    align-items: flex-start;
    text-align: left;
  }
  .class-action-col {
    justify-content: stretch;
  }
  .class-detail-btn {
    width: 100%;
    justify-content: center;
  }

  /* Course detail responsive layout */
  .course-detail-hero {
    grid-template-columns: 1fr;
    padding: 20px 16px;
    gap: 16px;
  }
  .course-hero-media {
    width: 100%;
    height: 180px;
    order: -1;
  }
  .course-hero-title {
    font-size: 24px;
  }
  .course-hero-mobile-cta {
    display: flex;
  }
  .course-sidebar-col.sticky {
    display: block;
    position: static;
  }
  .course-sidebar-col.sticky .action-card-header,
  .course-sidebar-col.sticky .enrollment-action-card > .btn {
    display: none;
  }
  .course-sidebar-col.sticky .enrollment-action-card {
    padding: 16px 18px;
    gap: 10px;
  }
  .mobile-sticky-action {
    display: block;
  }
  body {
    padding-bottom: 64px;
  }
}

@media (max-width: 480px) {
  .hero-masthead-inner,
  .hero-compact-inner { padding: 24px 16px; }
  .hero-title { font-size: 32px !important; line-height: 1.25; }
  .hero-compact h1 { font-size: 24px !important; }
  .hero-desc { font-size: 14px !important; }
  .hero-compact p { font-size: 14px !important; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* Cổng đăng nhập trang chủ + đăng nhập ngoài */
.auth-gate {
  max-width: 1040px;
  margin: 48px auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 440px;
  gap: 48px;
  align-items: center;
}
.auth-gate-intro .page-title { text-align: left; }
.auth-gate-intro .page-lead { text-align: left; margin-bottom: 20px; }
.auth-gate-points { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 10px; }
.auth-gate-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink);
}
.auth-gate-points .ph-bold { color: var(--success); font-size: 18px; flex-shrink: 0; }
.auth-gate-school {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-700);
  text-decoration: none;
}
.auth-gate-school:hover { text-decoration: underline; }
.auth-gate .auth-panel { margin: 0; max-width: none; }

.auth-panel-wide { max-width: 560px; }
.auth-panel textarea.input { resize: vertical; min-height: 76px; }
.auth-icon-success { background: var(--success-bg); color: var(--success); border-color: var(--success-border); }

.auth-alt { margin-top: 20px; }
.auth-alt-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-muted);
  font-size: 13px;
  margin-bottom: 14px;
}
.auth-alt-divider::before,
.auth-alt-divider::after {
  content: "";
  flex: 1;
  border-top: 1px solid var(--line);
}
.auth-alt-buttons { display: grid; gap: 10px; }
.auth-alt-btn { justify-content: center; }
.auth-alt-btn svg { flex-shrink: 0; }

@media (max-width: 900px) {
  .auth-gate { grid-template-columns: 1fr; gap: 28px; margin: 32px auto; }
  .auth-gate-intro .page-title,
  .auth-gate-intro .page-lead { text-align: center; }
  .auth-gate-points li { justify-content: flex-start; }
}


/* Trang nội dung tĩnh: chính sách bảo mật, điều khoản */
.trang-noi-dung {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 0 56px;
}
.trang-noi-dung .page-lead { margin-bottom: 24px; }
.trang-noi-dung h2 {
  margin: 28px 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--brand-900);
}
.trang-noi-dung p,
.trang-noi-dung li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}
.trang-noi-dung ul { margin: 0 0 8px; padding-left: 22px; }
.trang-noi-dung li + li { margin-top: 6px; }
.trang-noi-dung a { color: var(--brand-700); font-weight: 600; }
.trang-noi-dung a:hover { text-decoration: underline; }