/* ==========================================================================
   Trường Tiểu học Quốc tế Thăng Long – Hệ thống Giáo dục Bill Gates
   Tuyển sinh 2027–2028 Landing Page Stylesheet
   Brand Color: Deep Royal Purple (#4e008a) from Official School Logo
   Zero Box Borders • Single-Line Menu • Unified Buttons • Typographic Numbers
   ========================================================================== */

:root {
  /* Brand Purple Identity Palette (Extracted from logo-icon.jpg: #4e008a) */
  --primary: #4e008a;
  --primary-hover: #6209a8;
  --primary-light: #7c1fc4;
  --primary-vivid: #9333ea;
  --on-primary: #ffffff;
  --primary-container: #f2e7fe;
  --on-primary-container: #31005a;

  /* Secondary / Complementary Violet-Magenta & Warm Gold Accents */
  --accent: #a21caf;
  --accent-light: #c026d3;
  --accent-container: #fae8ff;
  --on-accent-container: #4a044e;

  --warm: #d97706;
  --warm-container: #fef3c7;

  /* Tonal Surfaces (Used instead of borders to separate boxes cleanly) */
  --surface: #fcfaff;
  --surface-bright: #ffffff;
  --surface-container-low: #f5f0fb;
  --surface-container: #ede4f7;
  --surface-container-high: #e3d5f3;
  --on-surface: #1b0c2e;
  --on-surface-variant: #524168;

  /* Semantic Validation Colors */
  --error: #d93025;
  --error-container: #fce8e6;
  --success: #15803d;
  --success-container: #dcfce7;

  /* Typography */
  --font-sans: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', 'Be Vietnam Pro', sans-serif;

  /* M3 Shape Tokens */
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --radius-pill: 9999px;

  /* Soft Diffused Ambient Shadows (Replaces box borders) */
  --shadow-1: 0 8px 28px -6px rgba(78, 0, 138, 0.06), 0 4px 12px -4px rgba(78, 0, 138, 0.04);
  --shadow-2: 0 14px 36px -8px rgba(78, 0, 138, 0.1), 0 6px 18px -6px rgba(78, 0, 138, 0.06);
  --shadow-3: 0 24px 48px -12px rgba(78, 0, 138, 0.16), 0 8px 24px -6px rgba(78, 0, 138, 0.08);

  /* Layout & Header */
  --header-height-initial: 84px;
  --header-height-shrunk: 68px;
  --container-max: 1280px;

  /* Physics-based Easing (linear() Spring Curve per modern-web-guidance) */
  --gentle-spring: linear(
    0, 0.009, 0.035 2.1%, 0.141, 0.281 6.7%, 0.723 12.9%, 0.938 16.7%, 1.017,
    1.077, 1.121, 1.149 24.3%, 1.159, 1.163, 1.161, 1.154 29.9%, 1.129 32.8%,
    1.051 39.6%, 1.017 43.1%, 0.991, 0.977 51%, 0.974 53.8%, 0.975 57.1%,
    0.997 69.8%, 1.003 76.9%, 1
  );
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  font-family: var(--font-sans);
  color: var(--on-surface);
  background-color: var(--surface);
  line-height: 1.65;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  @media (prefers-reduced-motion: reduce) {
    scroll-behavior: auto;
  }
}

body {
  padding-top: var(--header-height-initial);
  overflow-x: clip;
  width: 100%;
  max-width: 100vw;
}

/* Text Layout and Legibility (improve-text-layout-and-legibility) */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--on-surface);
  line-height: 1.24;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

p, li, blockquote, dd {
  text-wrap: pretty;
}

/* Prevent awkward line-breaks on compound terms like (Lớp 1–5) */
.nowrap {
  white-space: nowrap;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Material Symbols Font Icons Configuration */
.material-symbols-rounded {
  font-variation-settings: 'FILL' 1, 'wght' 500, 'GRAD' 0, 'opsz' 24;
  font-size: 1.3rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  flex-shrink: 0;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip Link */
.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  background: var(--primary);
  color: var(--on-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  transition: translate 0.25s ease-out;
}
.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  width: min(100% - 2.5rem, var(--container-max));
  margin-inline: auto;
}

/* ==========================================================================
   Scroll Progress Indicator & Shrinking Header (Strictly 1-Line Menu)
   ========================================================================== */
.scroll-progress-track {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1100;
  background: rgba(78, 0, 138, 0.08);
}

.scroll-progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-vivid), var(--accent-light));
  transform-origin: 0 50%;
  scale: 0 1;
}

@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: scroll()) and (animation-range: 0% 100%)) {
    @keyframes scale-progress {
      to {
        scale: 1 1;
      }
    }
    .scroll-progress-bar {
      animation: scale-progress auto linear forwards;
      animation-timeline: scroll(block root);
      animation-range: 0% 100%;
    }
  }
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height-initial);
  z-index: 1000;
  background: rgba(252, 250, 255, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 4px 24px -6px rgba(78, 0, 138, 0.06);
  display: flex;
  align-items: center;
  transition: height 0.25s ease-out, box-shadow 0.25s ease-out, background-color 0.25s ease-out;
}

.site-header.is-scrolled {
  height: var(--header-height-shrunk);
  background: rgba(255, 255, 255, 0.97);
  box-shadow: var(--shadow-1);
}

@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: scroll()) and (animation-range: 0% 100%)) {
    @keyframes shrink-header {
      to {
        height: var(--header-height-shrunk);
        background-color: rgba(255, 255, 255, 0.97);
        box-shadow: 0 6px 24px -4px rgba(78, 0, 138, 0.1);
      }
    }
    .site-header {
      animation: shrink-header auto linear both;
      animation-timeline: scroll(block root);
      animation-range: 0px 120px;
    }
  }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  height: 100%;
  flex-wrap: nowrap;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
  min-width: 0;
  white-space: nowrap;
}

.brand-logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 10px;
  background: #ffffff;
  flex-shrink: 0;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}

.main-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.15rem;
  list-style: none;
  white-space: nowrap;
}

.nav-link {
  display: inline-block;
  padding: 0.5rem 0.72rem;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background-color: var(--primary-container);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.mobile-menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  border: none;
  background: var(--primary-container);
  color: var(--primary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.mobile-drawer {
  position: fixed;
  top: var(--header-height-shrunk);
  left: 0;
  right: 0;
  background: var(--surface-bright);
  box-shadow: var(--shadow-2);
  padding: 1rem 1.5rem 1.5rem;
}

.mobile-nav-list {
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.mobile-nav-link {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--on-surface);
}
.mobile-nav-link:hover {
  background: var(--primary-container);
  color: var(--primary);
}

.mobile-drawer-cta {
  margin-top: 1rem;
  padding-top: 1rem;
  display: flex;
}

/* ==========================================================================
   Unified Buttons (Strictly identical height, padding, font-size & pill shape)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  height: 48px;
  padding: 0 1.6rem;
  font-family: var(--font-sans);
  font-size: 0.94rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  width: fit-content;
  flex-shrink: 0;
  transition: transform 0.25s ease-out, box-shadow 0.25s ease-out, background-color 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--on-primary);
  box-shadow: 0 8px 20px -4px rgba(78, 0, 138, 0.32);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary-vivid) 100%);
  box-shadow: 0 12px 26px -4px rgba(78, 0, 138, 0.42);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #ffffff;
  box-shadow: 0 8px 20px -4px rgba(162, 28, 175, 0.3);
}
.btn-secondary:hover {
  box-shadow: 0 12px 26px -4px rgba(162, 28, 175, 0.4);
}

.btn-tonal {
  background-color: var(--primary-container);
  color: var(--primary);
}
.btn-tonal:hover {
  background-color: #e5d0fd;
}

.card-action-row,
.form-submit-row {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
}

/* Physics-based Spring Hover Interaction */
.spring-interactive {
  transition: scale 0.35s ease-out, translate 0.35s ease-out, box-shadow 0.3s ease-out;
  transition-timing-function: var(--gentle-spring);
  @media (prefers-reduced-motion: reduce) {
    transition: none;
  }
}

.spring-interactive:hover {
  scale: 1.025;
  translate: 0 -3px;
  @media (prefers-reduced-motion: reduce) {
    scale: 1;
    translate: 0 0;
  }
}

.spring-interactive:active {
  scale: 0.985;
  translate: 0 0;
}

/* ==========================================================================
   Typographic Numbering System (Pure Number + Brand Color, No Background Fill)
   ========================================================================== */
.num-accent,
.pillar-num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.65rem;
  user-select: none;
  flex-shrink: 0;
}

.pillar-num {
  font-size: 2.35rem;
  margin-bottom: 0;
}

.num-accent-lg {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--primary);
  flex-shrink: 0;
  min-width: 52px;
}

.num-accent-sm {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1;
  color: var(--primary);
  flex-shrink: 0;
  min-width: 34px;
}

.step-num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.95rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--primary);
  min-width: 44px;
  flex-shrink: 0;
}

.step-num-accent {
  color: var(--accent);
}

/* Pill Badges (No borders) */
.badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.15rem;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42rem 1rem;
  border-radius: var(--radius-pill);
  font-size: 0.83rem;
  font-weight: 700;
  white-space: nowrap;
}
.pill-badge .material-symbols-rounded {
  font-size: 1.1rem;
}

.badge-primary {
  background-color: var(--primary-container);
  color: var(--primary);
}
.badge-tonal {
  background-color: var(--surface-container);
  color: var(--on-surface);
}
.badge-accent {
  background-color: var(--accent-container);
  color: var(--accent);
}
.badge-light {
  background-color: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

/* ==========================================================================
   Scroll Entry/Exit Effects (scroll-entry-exit-effects)
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: view()) and (animation-range: entry)) {
    @keyframes reveal-up {
      from {
        opacity: 0;
        translate: 0 32px;
        scale: 0.97;
      }
      to {
        opacity: 1;
        translate: 0 0;
        scale: 1;
      }
    }

    .reveal-item {
      animation: reveal-up auto linear backwards;
      animation-timeline: view(block);
      animation-range: entry 5% cover 24%;
    }
  }
}

.reveal-fallback-hidden {
  opacity: 0;
  translate: 0 28px;
  transition: opacity 0.6s ease-out, translate 0.6s ease-out;
}
.reveal-fallback-visible {
  opacity: 1;
  translate: 0 0;
}

/* ==========================================================================
   Section 1: Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 3.25rem 0 4.5rem;
  background:
    radial-gradient(circle at 12% 15%, rgba(78, 0, 138, 0.08) 0%, transparent 44%),
    radial-gradient(circle at 88% 22%, rgba(162, 28, 175, 0.08) 0%, transparent 48%),
    linear-gradient(180deg, #f7f2fd 0%, var(--surface) 100%);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 3rem;
  align-items: center;
}

.hero-school-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}

.title-highlight {
  font-size: clamp(1.85rem, 3.1vw, 2.75rem);
  font-weight: 800;
  background: linear-gradient(125deg, var(--primary) 0%, var(--primary-vivid) 55%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.title-sub {
  font-size: clamp(1.25rem, 1.9vw, 1.6rem);
  font-weight: 700;
  color: var(--on-surface);
}

.hero-description {
  font-size: 1.01rem;
  color: var(--on-surface-variant);
  margin-bottom: 1.85rem;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 2.35rem;
}

/* Stat Cards: Tonal Surface + Typographic Purple Numbers (Zero Borders) */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.stat-card {
  background: var(--surface-bright);
  border-radius: var(--radius-md);
  padding: 1.15rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: var(--shadow-1);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  line-height: 1.4;
}

/* Hero Visual & Floating Cards (Zero Borders) */
.hero-image-frame {
  position: relative;
  border-radius: var(--radius-xl);
  padding: 0.65rem;
  background: var(--surface-bright);
  box-shadow: var(--shadow-3);
}

.hero-main-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: calc(var(--radius-xl) - 6px);
}

.floating-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  padding: 0.9rem 1.2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 295px;
}

.floating-card strong {
  display: block;
  font-size: 0.88rem;
  color: var(--primary);
}

.floating-card span {
  font-size: 0.76rem;
  color: var(--on-surface-variant);
}

.floating-icon {
  color: var(--primary);
  font-size: 1.65rem;
}

.floating-card-top {
  top: -1rem;
  right: -1rem;
}

.floating-card-bottom {
  bottom: -1.2rem;
  left: -1rem;
}
.floating-card-bottom .floating-icon {
  color: var(--accent);
}

/* Hero Functional Rooms Bar (Zero Borders) */
.hero-highlights-bar {
  margin-top: 3.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  background: var(--surface-bright);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-2);
}

.highlight-pillar {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
}

.highlight-pillar h2 {
  font-size: 1.06rem;
  margin-bottom: 0.45rem;
  color: var(--on-surface);
}

.highlight-pillar p {
  font-size: 0.89rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* ==========================================================================
   General Sections & M3 Tonal Cards (Zero Borders)
   ========================================================================== */
.section {
  padding: 5.25rem 0;
}

.section-tonal {
  background-color: var(--surface-container-low);
}

.section-header {
  max-width: 920px;
  margin: 0 auto 3.25rem;
  text-align: center;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 1.05rem;
  border-radius: var(--radius-pill);
  background: var(--primary-container);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.95rem;
}

.section-title {
  font-size: clamp(1.65rem, 2.5vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 0.85rem;
}

.section-subtitle {
  max-width: 760px;
  margin-inline: auto;
  font-size: 1.03rem;
  color: var(--on-surface-variant);
}

/* M3 Card: Pure Surface + Ambient Elevation Shadow, No Border */
.m3-card,
.hero-content,
.hero-visual,
.table-wrapper,
.campus-card,
.stat-card {
  min-width: 0;
  max-width: 100%;
}

.m3-card {
  background: var(--surface-bright);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-1);
}

/* ==========================================================================
   Section 2: Định hướng trường
   ========================================================================== */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.pillar-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

.pillar-card p {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
}

.orientation-bento {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 1.5rem;
  align-items: stretch;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.28rem;
  margin-bottom: 1.35rem;
  color: var(--primary);
}

.detail-list {
  display: grid;
  gap: 0.85rem;
}

.detail-row {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 1rem;
  padding: 0.95rem 1.15rem;
  border-radius: var(--radius-sm);
  background: var(--surface-container-low);
  align-items: start;
}

.detail-row dt {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.92rem;
}

.detail-row dd {
  font-size: 0.94rem;
  color: var(--on-surface);
}

.principal-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(160deg, var(--primary) 0%, #2c0052 100%);
  color: #ffffff;
}

.principal-photo-wrap {
  width: 118px;
  height: 118px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
  margin-bottom: 1.15rem;
}

.principal-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.principal-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #e9d5ff;
  margin-bottom: 0.35rem;
}

.principal-info h3 {
  color: #ffffff;
  font-size: 1.35rem;
  margin-bottom: 0.2rem;
}

.principal-role {
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1rem;
}

.principal-quote {
  font-size: 0.92rem;
  font-style: italic;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.94);
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   Section 3: Chương trình & Thời gian biểu
   ========================================================================== */
.tabs-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.25rem;
  background: var(--surface-container-low);
  padding: 0.45rem;
  border-radius: var(--radius-pill);
  width: fit-content;
  margin-inline: auto;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 46px;
  padding: 0 1.4rem;
  border-radius: var(--radius-pill);
  border: none;
  background: transparent;
  color: var(--on-surface-variant);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.tab-btn:hover {
  color: var(--primary);
}

.tab-btn.active {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: var(--shadow-1);
}

.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.curr-card {
  background: var(--surface-container-low);
}

.curr-card-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 0.85rem;
}

.curr-highlight {
  font-weight: 700;
  color: var(--primary);
  background: var(--surface-bright);
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.85rem;
}

.tag-cloud {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.tag-cloud li {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-pill);
  background: var(--surface-bright);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--on-surface);
}
.tag-cloud li .material-symbols-rounded {
  font-size: 1.05rem;
  color: var(--primary);
}

.dual-list {
  display: grid;
  gap: 1rem;
}
.dual-list h4 {
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.primary-program-layout {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 1.5rem;
  align-items: stretch;
}

.program-visual-card {
  background: var(--surface-bright);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  display: flex;
  flex-direction: column;
}

.program-visual-card img {
  width: 100%;
  height: 100%;
  min-height: 260px;
  object-fit: cover;
  flex: 1;
}

.program-visual-caption {
  padding: 1rem 1.25rem;
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-weight: 600;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.inline-highlight {
  display: inline-block;
  padding: 0.28rem 0.8rem;
  border-radius: var(--radius-pill);
  background: var(--accent-container);
  color: var(--accent);
  font-weight: 800;
}

/* ==========================================================================
   Responsive Data Tables (Zero Borders, Tonal Alternating Rows)
   ========================================================================== */
.table-wrapper {
  width: 100%;
  overflow: auto;
  max-inline-size: 100%;
  max-block-size: min(620px, 80vh);
  container-type: inline-size;
  border-radius: var(--radius-md);
  background: var(--surface-bright);
  box-shadow: var(--shadow-1);
}

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
  font-size: 0.94rem;
}

.data-table thead {
  position: sticky;
  inset-block-start: 0;
  z-index: 2;
}

.data-table thead th {
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 700;
  padding: 1.05rem 1.35rem;
}

.data-table tbody th,
.data-table tbody td {
  padding: 1rem 1.35rem;
  vertical-align: middle;
}

.data-table tbody tr:nth-child(even) th,
.data-table tbody tr:nth-child(even) td {
  background-color: var(--surface-container-low);
}

.data-table tbody tr:nth-child(odd) th,
.data-table tbody tr:nth-child(odd) td {
  background-color: var(--surface-bright);
}

.data-table tbody th {
  position: sticky;
  inset-inline-start: 0;
  font-weight: 700;
  color: var(--primary);
  z-index: 1;
}

.data-table tbody tr:hover th,
.data-table tbody tr:hover td {
  background-color: var(--primary-container);
}

.row-icon {
  vertical-align: middle;
  margin-right: 0.45rem;
  color: var(--primary);
}

.schedule-tag {
  display: inline-flex;
  padding: 0.28rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
}
.tag-study {
  background: var(--primary-container);
  color: var(--primary);
}
.tag-care {
  background: #dcfce7;
  color: #15803d;
}
.tag-break {
  background: var(--warm-container);
  color: var(--warm);
}
.tag-club {
  background: var(--accent-container);
  color: var(--accent);
}

/* Container Query Stacked Layout for Narrow Containers (responsive-table) */
@container (width < 600px) {
  .data-table,
  .data-table thead,
  .data-table tbody,
  .data-table tr,
  .data-table th,
  .data-table td {
    display: block;
  }

  .data-table thead {
    /* MANDATORY: Hide column header from layout and screen readers */
    display: none;
  }

  .data-table tr {
    margin-block-end: 1rem;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--surface-container-low);
  }

  .data-table tbody th {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background: var(--primary-container) !important;
  }

  .data-table td:nth-child(2)::before {
    content: var(--label-2) ": ";
    font-weight: 700;
    color: var(--on-surface-variant);
  }

  .data-table td:nth-child(3)::before {
    content: var(--label-3) ": ";
    font-weight: 700;
    color: var(--on-surface-variant);
  }

  .data-table td:nth-child(4)::before {
    content: var(--label-4) ": ";
    font-weight: 700;
    color: var(--on-surface-variant);
  }
}

.schedule-intro {
  margin-bottom: 1.25rem;
}
.schedule-intro h3 {
  font-size: 1.3rem;
  margin-bottom: 0.35rem;
}

/* ==========================================================================
   Section 4 & 6: Dự án, Xưởng LUMINA & Hồ sơ tốt nghiệp
   ========================================================================== */
.project-showcase-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.5rem;
  align-items: stretch;
}

.project-feature-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-feature-media {
  position: relative;
}

.project-feature-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.project-overlay-badge {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  background: rgba(78, 0, 138, 0.92);
  color: #ffffff;
  padding: 0.5rem 1.05rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.project-feature-body {
  padding: 1.85rem;
}

.project-kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.project-kpi {
  background: var(--surface-container-low);
  padding: 0.95rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

.project-kpi strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
}

.project-kpi span {
  font-size: 0.78rem;
  color: var(--on-surface-variant);
}

.graduate-profile-column {
  display: grid;
  gap: 1.15rem;
}

.profile-group-card {
  display: flex;
  align-items: flex-start;
  gap: 1.15rem;
  padding: 1.65rem;
}

.profile-group-card h3 {
  font-size: 1.18rem;
  margin-bottom: 0.4rem;
}

.profile-group-card p {
  font-size: 0.92rem;
  color: var(--on-surface-variant);
}

/* ==========================================================================
   Section 5: Kết quả và thành tích
   ========================================================================== */
.awards-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.award-card {
  background: var(--surface-container-low);
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.award-total {
  background: linear-gradient(145deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #ffffff;
}
.award-total .award-count,
.award-total .award-tier,
.award-total .award-detail {
  color: #ffffff;
  background: none;
  -webkit-text-fill-color: #ffffff;
}

.award-count {
  font-family: var(--font-display);
  font-size: 2.35rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.award-tier {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.45rem;
  color: var(--on-surface);
}

.award-detail {
  font-size: 0.86rem;
  color: var(--on-surface-variant);
}

.table-card {
  background: var(--surface-container-low);
}

.table-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.table-card-header h3 {
  font-size: 1.25rem;
}
.table-card-header p {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

/* ==========================================================================
   Section 7: Học phí và ưu đãi
   ========================================================================== */
.tuition-layout {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 1.5rem;
  align-items: stretch;
}

.tuition-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.35rem;
}

.tuition-card-top h3 {
  font-size: 1.35rem;
  margin-top: 0.5rem;
}

.tuition-highlight-price {
  background: var(--primary-container);
  padding: 0.95rem 1.4rem;
  border-radius: var(--radius-md);
  text-align: right;
}

.price-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
}

.price-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}
.price-value span {
  font-size: 0.95rem;
}

.tuition-policy-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.policy-card-heading {
  font-size: 1.35rem;
  margin: 0.65rem 0 0.6rem;
}

.policy-checklist {
  list-style: none;
  display: grid;
  gap: 0.9rem;
  margin: 1.25rem 0 1.5rem;
}

.policy-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.93rem;
}
.policy-checklist .material-symbols-rounded {
  color: var(--primary);
  margin-top: 0.1rem;
}

/* ==========================================================================
   Section 8 & 9: Học bổng & Tuyển sinh thông thường (Typographic Steppers)
   ========================================================================== */
.admissions-dual-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.admission-box {
  background: var(--surface-container-low);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.admission-box-header h3 {
  font-size: 1.35rem;
  margin: 0.65rem 0 0.4rem;
}

.admission-box-header p {
  font-size: 0.92rem;
  color: var(--on-surface-variant);
  margin-bottom: 1.5rem;
}

.stepper-list {
  list-style: none;
  display: grid;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

.stepper-item {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  padding: 1.05rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--surface-bright);
  box-shadow: 0 2px 10px rgba(78, 0, 138, 0.04);
}

.step-content h4 {
  font-size: 0.98rem;
  margin-bottom: 0.25rem;
  color: var(--on-surface);
}

.step-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.84rem;
  color: var(--on-surface-variant);
}
.step-meta .material-symbols-rounded {
  font-size: 1rem;
  color: var(--primary);
}

.admission-quick-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.quick-fact {
  background: var(--primary-container);
  color: var(--on-primary-container);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.quick-fact .material-symbols-rounded {
  color: var(--primary);
  margin-bottom: 0.15rem;
}
.quick-fact strong {
  font-size: 0.76rem;
  text-transform: uppercase;
  opacity: 0.85;
}
.quick-fact span {
  font-size: 0.88rem;
  font-weight: 700;
}

.scholarship-meta-note {
  background: var(--surface-bright);
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius-md);
}
.scholarship-meta-note p {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.87rem;
  color: var(--on-surface-variant);
}
.scholarship-meta-note .material-symbols-rounded {
  color: var(--accent);
}

/* ==========================================================================
   Section 10: Cơ sở vật chất & Không gian
   ========================================================================== */
.campus-gallery-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}

.campus-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  background: #1b0c2e;
}

.campus-card img {
  width: 100%;
  height: 390px;
  object-fit: cover;
  transition: scale 0.6s ease-out;
}
.campus-card:hover img {
  scale: 1.04;
}

.campus-caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1.6rem;
  background: linear-gradient(0deg, rgba(27, 12, 46, 0.94) 0%, rgba(27, 12, 46, 0.58) 70%, transparent 100%);
  color: #ffffff;
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}
.campus-caption h3 {
  color: #ffffff;
  font-size: 1.18rem;
  margin-bottom: 0.25rem;
}
.campus-caption p {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.88);
}

.facilities-specs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.spec-card h3 {
  font-size: 1.12rem;
  margin-bottom: 0.4rem;
}

.spec-card p {
  font-size: 0.92rem;
  color: var(--on-surface-variant);
}

/* ==========================================================================
   Section 11: Khảo sát và phản hồi phụ huynh
   ========================================================================== */
.survey-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.survey-metric-card {
  background: var(--surface-container-low);
  text-align: center;
  padding: 2.35rem 1.5rem;
}

.survey-metric-featured {
  background: linear-gradient(145deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #ffffff;
}
.survey-metric-featured h3,
.survey-metric-featured p,
.survey-metric-featured .survey-value {
  color: #ffffff;
  background: none;
  -webkit-text-fill-color: #ffffff;
}

.survey-value {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: block;
  line-height: 1.1;
  margin-bottom: 0.45rem;
}
.survey-value span {
  font-size: 1.4rem;
}

.parent-feedback-layout {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 1.5rem;
}

.feedback-themes-card,
.parent-directory-card {
  background: var(--surface-container-low);
}

.feedback-themes-card h3,
.parent-directory-card h3 {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.22rem;
  margin-bottom: 1.25rem;
  color: var(--primary);
}

.themes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.theme-item {
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: var(--surface-bright);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.theme-item h4 {
  font-size: 0.98rem;
  margin-bottom: 0.35rem;
}
.theme-item p {
  font-size: 0.87rem;
  color: var(--on-surface-variant);
}

.parent-list {
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.parent-list-item {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.95rem 1.1rem;
  border-radius: var(--radius-sm);
  background: var(--surface-bright);
}

.parent-list-item strong {
  display: block;
  font-size: 0.95rem;
}
.parent-list-item span {
  font-size: 0.83rem;
  color: var(--on-surface-variant);
}

/* ==========================================================================
   Section 12: Biểu mẫu và liên hệ + Form Validation (Zero Box Borders)
   ========================================================================== */
.section-contact {
  background: linear-gradient(135deg, #2b004d 0%, var(--primary) 55%, #5c0b9e 100%);
  color: #ffffff;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 3rem;
  align-items: start;
}

.contact-title {
  color: #ffffff;
  font-size: clamp(1.7rem, 2.5vw, 2.25rem);
  margin: 0.9rem 0 1rem;
}

.contact-desc {
  color: rgba(255, 255, 255, 0.88);
  font-size: 1rem;
  margin-bottom: 2rem;
}

.contact-cards {
  display: grid;
  gap: 1.1rem;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.2rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

.contact-info-item h3 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 0.2rem;
}
.contact-info-item p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.86);
}

.contact-form-card {
  color: var(--on-surface);
  padding: 2.35rem;
  box-shadow: var(--shadow-3);
}

.form-header {
  margin-bottom: 1.5rem;
}
.form-header h3 {
  font-size: 1.4rem;
  color: var(--primary);
}
.form-header p {
  font-size: 0.88rem;
  color: var(--on-surface-variant);
}

.admission-form {
  display: grid;
  gap: 1.15rem;
}

.field,
.field-group {
  border: none;
  display: flex;
  flex-direction: column;
}

.field-label {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--on-surface);
  margin-bottom: 0.2rem;
}

.req-star {
  color: var(--error);
}

/* MANDATORY per validate-input-after-interaction: Place format hints above the input */
.field-hint {
  display: block;
  color: var(--on-surface-variant);
  font-size: 0.8rem;
  margin-bottom: 0.45rem;
}

.chip-checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

.chip-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.72rem 0.95rem;
  border-radius: var(--radius-sm);
  background: var(--surface-container-low);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.chip-option input {
  accent-color: var(--primary);
}

.chip-option:has(input:checked) {
  background-color: var(--primary-container);
  color: var(--primary);
}

.input-wrap,
.select-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix-icon {
  position: absolute;
  left: 0.95rem;
  color: var(--primary);
  pointer-events: none;
  font-size: 1.2rem;
}

.admission-form input[type="text"],
.admission-form input[type="tel"],
.admission-form select {
  width: 100%;
  height: 48px;
  padding: 0 1rem 0 2.8rem;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--on-surface);
  background-color: var(--surface-container-low);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.admission-form input:focus,
.admission-form select:focus {
  outline: none;
  background-color: var(--surface-bright);
  box-shadow: 0 0 0 2.5px var(--primary);
}

.error-msg {
  display: none;
  align-items: center;
  gap: 0.35rem;
  color: var(--error);
  font-size: 0.83rem;
  font-weight: 600;
  margin-top: 0.35rem;
}
.error-msg .material-symbols-rounded {
  font-size: 1.05rem;
}

/* Validate Input After Interaction (:user-invalid & :user-valid + fallback) */
.admission-form input:user-invalid,
.admission-form input.user-invalid-fallback {
  background-color: var(--error-container);
  box-shadow: 0 0 0 2px var(--error);
}

.field:has(input:user-invalid) .error-msg,
.field:has(input.user-invalid-fallback) .error-msg {
  display: flex;
}

.field:has(input:user-invalid) .field-hint,
.field:has(input.user-invalid-fallback) .field-hint {
  color: var(--error);
  font-weight: 600;
}

.admission-form input:user-valid,
.admission-form input.user-valid-fallback {
  box-shadow: 0 0 0 2px var(--success);
}

.form-success-banner {
  margin-top: 0.75rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-sm);
  background: var(--success-container);
  color: #14532d;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.form-success-banner[hidden] {
  display: none;
}

/* ==========================================================================
   Footer & Floating CTA & Native Modal Dialog
   ========================================================================== */
.site-footer {
  background: #170429;
  color: rgba(255, 255, 255, 0.84);
  padding: 3.5rem 0 2rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
}

.footer-brand .brand-title {
  color: #ffffff;
}

.footer-motto {
  margin: 1rem 0 0.65rem;
  font-weight: 700;
  color: #e9d5ff;
  font-size: 0.92rem;
}

.footer-location {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
}

.footer-links h4 {
  color: #ffffff;
  margin-bottom: 0.9rem;
}

.footer-links ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.55rem 1rem;
  font-size: 0.88rem;
}
.footer-links a:hover {
  color: #e9d5ff;
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.56);
}

/* Floating Quick Action CTA (Unified .btn height) */
.floating-cta-btn {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 950;
}

/* Native <dialog> Modal with Top-Layer Discrete Transitions */
.m3-dialog {
  margin: auto;
  border: none;
  border-radius: var(--radius-xl);
  padding: 0;
  width: min(92vw, 520px);
  background: var(--surface-bright);
  box-shadow: var(--shadow-3);
  opacity: 0;
  scale: 0.94;
  transition:
    opacity 0.24s ease-out,
    scale 0.24s ease-out,
    display 0.24s allow-discrete,
    overlay 0.24s allow-discrete;
}

.m3-dialog[open] {
  opacity: 1;
  scale: 1;
}

@starting-style {
  .m3-dialog[open] {
    opacity: 0;
    scale: 0.94;
  }
}

.m3-dialog::backdrop {
  background: rgba(23, 4, 41, 0.58);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition:
    opacity 0.24s ease-out,
    display 0.24s allow-discrete,
    overlay 0.24s allow-discrete;
}

.m3-dialog[open]::backdrop {
  opacity: 1;
}

@starting-style {
  .m3-dialog[open]::backdrop {
    opacity: 0;
  }
}

.modal-surface {
  padding: 2.25rem;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.modal-header h2 {
  font-size: 1.35rem;
  margin-top: 0.45rem;
}

.icon-close-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: var(--surface-container-low);
  color: var(--primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-close-btn:hover {
  background: var(--primary-container);
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 1220px) {
  .main-nav {
    display: none;
  }
  .mobile-menu-toggle {
    display: inline-flex;
  }
}

@media (max-width: 1080px) {
  .hero-grid,
  .orientation-bento,
  .primary-program-layout,
  .project-showcase-grid,
  .tuition-layout,
  .admissions-dual-grid,
  .campus-gallery-grid,
  .parent-feedback-layout,
  .contact-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .hero-highlights-bar,
  .pillars-grid,
  .curriculum-grid,
  .facilities-specs-grid,
  .survey-metrics-grid,
  .hero-stats-grid,
  .awards-summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .container {
    width: min(100% - 2rem, var(--container-max));
  }
  .header-inner {
    gap: 0.65rem;
  }
  .brand-logo {
    flex: 1;
    gap: 0.55rem;
  }
  .brand-logo-img {
    width: 36px;
    height: 36px;
  }
  .brand-title {
    font-size: clamp(0.82rem, 3.8vw, 0.98rem);
  }
  .header-actions .btn {
    display: none;
  }
  .mobile-menu-toggle {
    width: 42px;
    height: 42px;
  }
  .tabs-list {
    width: 100%;
    border-radius: var(--radius-md);
    flex-direction: column;
    align-items: stretch;
  }
  .tab-btn {
    width: 100%;
    justify-content: center;
    white-space: normal;
  }
}

@media (max-width: 680px) {
  .section {
    padding: 3.5rem 0;
  }
  .hero-section {
    padding: 2rem 0 3.25rem;
  }
  .hero-highlights-bar,
  .pillars-grid,
  .curriculum-grid,
  .facilities-specs-grid,
  .survey-metrics-grid,
  .awards-summary-grid,
  .themes-grid,
  .project-kpis,
  .admission-quick-facts,
  .chip-checkbox-grid,
  .footer-inner,
  .footer-links ul {
    grid-template-columns: minmax(0, 1fr);
  }
  .hero-stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }
  .m3-card,
  .hero-highlights-bar,
  .contact-form-card,
  .modal-surface {
    padding: 1.4rem;
  }
  .pill-badge {
    white-space: normal;
    max-width: 100%;
  }
  .detail-row {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  .floating-card {
    position: static;
    margin-top: 0.65rem;
    max-width: 100%;
  }
  .floating-cta-btn {
    right: 1rem;
    bottom: 1rem;
  }
}