/* ============================================================
   Hoc Lai Nhanh — style.css
   Mobile-first, responsive, dark mode support
   ============================================================ */

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

:root {
  --color-primary: #0e6b49;
  --color-primary-dark: #0a5038;
  --color-primary-light: #e8f5ef;
  --color-accent: #f59e0b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafb;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #5a5a7a;
  --color-border: #e2e8f0;
  --color-shadow: rgba(0,0,0,0.08);
  --font-main: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
  --radius: 10px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
  --container-max: 1200px;
  --header-h: 64px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #2dd4a0;
    --color-primary-dark: #1fb88a;
    --color-primary-light: #0f2a20;
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-surface: #1e293b;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
    --color-shadow: rgba(0,0,0,0.3);
  }
}

:root[data-theme="dark"] {
  --color-primary: #2dd4a0;
  --color-primary-dark: #1fb88a;
  --color-primary-light: #0f2a20;
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-surface: #1e293b;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-border: #334155;
  --color-shadow: rgba(0,0,0,0.3);
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; display: block; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 16px; }

/* --- Header --- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-h);
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
}
.logo {
  font-size: 1.3rem; font-weight: 700;
  color: var(--color-primary) !important;
  letter-spacing: -0.02em;
}
.main-nav { display: flex; gap: 4px; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500;
  color: var(--color-text-secondary);
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Menu toggle mobile */
.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.menu-toggle span {
  width: 24px; height: 2px; background: var(--color-text);
  transition: transform var(--transition);
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .main-nav {
    display: none; flex-direction: column;
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 16px;
    box-shadow: 0 4px 12px var(--color-shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; font-size: 1rem; }
}

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff; text-align: center;
  padding: 60px 16px 50px;
}
.hero h1 { font-size: 2rem; font-weight: 700; line-height: 1.25; margin-bottom: 12px; }
.hero-sub { font-size: 1.05rem; opacity: 0.9; max-width: 600px; margin: 0 auto 30px; }
.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { display: block; font-size: 1.8rem; font-weight: 700; }
.stat-label { font-size: 0.85rem; opacity: 0.85; }

@media (min-width: 768px) {
  .hero { padding: 80px 16px 70px; }
  .hero h1 { font-size: 2.8rem; }
}

/* --- Search --- */
.search-section { padding: 40px 0; }
.search-box { max-width: 600px; margin: 0 auto 32px; }
.search-box input {
  width: 100%; padding: 14px 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem; font-family: var(--font-main);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
}
.search-box input:focus {
  outline: none; border-color: var(--color-primary);
}
.search-box input::placeholder { color: var(--color-text-secondary); }

/* --- School Grid --- */
.school-grid {
  display: grid; gap: 20px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .school-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .school-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1280px) { .school-grid { grid-template-columns: repeat(4, 1fr); } }

.school-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.school-card:hover {
  box-shadow: 0 8px 24px var(--color-shadow);
  transform: translateY(-2px);
}
.card-img {
  width: 100%; height: 160px; object-fit: cover;
  background: var(--color-bg-alt);
}
.card-img-placeholder {
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light);
  font-size: 2rem; font-weight: 700; color: var(--color-primary);
}
.card-body { padding: 16px; }
.card-title { font-size: 1rem; font-weight: 600; margin-bottom: 6px; line-height: 1.35; }
.card-addr { font-size: 0.82rem; color: var(--color-text-secondary); margin-bottom: 8px; line-height: 1.4; }
.card-meta { display: flex; gap: 12px; font-size: 0.8rem; color: var(--color-text-secondary); margin-bottom: 8px; flex-wrap: wrap; }
.card-price { font-size: 0.95rem; font-weight: 600; color: var(--color-primary); margin-bottom: 12px; }

/* --- Buttons --- */
.btn {
  display: inline-block; padding: 10px 20px;
  border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 600;
  text-align: center; cursor: pointer; border: none;
  transition: background var(--transition), color var(--transition);
  font-family: var(--font-main);
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn-outline { border: 2px solid var(--color-primary); color: var(--color-primary); background: transparent; }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 0.82rem; }

/* --- Tables --- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 16px 0; }
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
}
.data-table th, .data-table td {
  padding: 10px 14px; text-align: left;
  border-bottom: 1px solid var(--color-border);
}
.data-table th {
  background: var(--color-bg-alt); font-weight: 600;
  position: sticky; top: 0;
  cursor: pointer; user-select: none;
}
.data-table th:hover { background: var(--color-primary-light); }
.data-table th::after { content: ' \2195'; font-size: 0.75rem; opacity: 0.4; }
.data-table tr:hover { background: var(--color-bg-alt); }
.data-table tr.highlight { background: var(--color-primary-light) !important; }
.data-table tr.highlight td { font-weight: 600; }
.price-cell { white-space: nowrap; }

/* --- Compare & Resources --- */
.compare-section, .resources-section { padding: 40px 0; }
.compare-section { background: var(--color-bg-alt); }
.compare-section h2, .resources-section h2 { font-size: 1.5rem; margin-bottom: 8px; }

.res-grid { display: grid; gap: 20px; grid-template-columns: 1fr; margin-top: 20px; }
@media (min-width: 640px) { .res-grid { grid-template-columns: repeat(3, 1fr); } }
.res-card {
  display: block; padding: 28px 20px; text-align: center;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: box-shadow var(--transition);
  color: var(--color-text);
}
.res-card:hover { box-shadow: 0 4px 16px var(--color-shadow); color: var(--color-text); }
.res-icon { font-size: 2rem; margin-bottom: 10px; }
.res-card h3 { font-size: 1rem; margin-bottom: 6px; }
.res-card p { font-size: 0.85rem; color: var(--color-text-secondary); }

/* --- School Detail Page --- */
.page-content { padding: 24px 0 60px; }
.breadcrumb { font-size: 0.85rem; color: var(--color-text-secondary); margin-bottom: 20px; }
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-primary); }

.school-header { margin-bottom: 32px; }
.school-header h1 { font-size: 1.8rem; margin-bottom: 10px; }
.school-desc { color: var(--color-text-secondary); font-size: 0.95rem; margin-bottom: 8px; line-height: 1.6; }
.school-source { font-size: 0.85rem; margin-bottom: 4px; }
.school-price-summary { font-size: 1.05rem; margin-top: 8px; }

.section-block { margin-bottom: 36px; }
.section-block h2 { font-size: 1.25rem; margin-bottom: 14px; padding-bottom: 8px; border-bottom: 2px solid var(--color-primary); }

.vp-list { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .vp-list { grid-template-columns: repeat(2, 1fr); } }
.vp-card {
  padding: 16px; background: var(--color-bg-alt);
  border-radius: var(--radius-sm); border: 1px solid var(--color-border);
}
.vp-card h4 { font-size: 0.95rem; margin-bottom: 6px; color: var(--color-primary); }
.vp-addr { font-size: 0.88rem; color: var(--color-text-secondary); margin-bottom: 4px; }
.vp-phone { font-size: 0.88rem; font-weight: 600; }

.promo-block {
  background: var(--color-primary-light);
  padding: 20px; border-radius: var(--radius);
}
.promo-block h2 { border-color: var(--color-primary); }
.promo-block ul { list-style: disc; padding-left: 20px; }
.promo-block li { margin-bottom: 6px; font-size: 0.92rem; }

.news-list { list-style: none; }
.news-list li { padding: 10px 0; border-bottom: 1px solid var(--color-border); display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.news-date { font-size: 0.8rem; color: var(--color-text-secondary); white-space: nowrap; min-width: 90px; }
.news-list a { font-size: 0.92rem; }

.contact-info p { margin-bottom: 8px; }
.contact-phone, .contact-email {
  display: inline-block; padding: 4px 10px; margin: 2px 4px 2px 0;
  background: var(--color-bg-alt); border-radius: var(--radius-sm);
  font-size: 0.88rem;
}
.social-links { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.social-link {
  display: inline-block; padding: 8px 16px;
  border-radius: var(--radius-sm); font-size: 0.85rem; font-weight: 600;
  color: #fff !important;
}
.social-facebook { background: #1877f2; }
.social-zalo { background: #0068ff; }
.social-tiktok { background: #010101; }
.social-youtube { background: #ff0000; }

.gallery { display: grid; gap: 8px; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 640px) { .gallery { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .gallery { grid-template-columns: repeat(4, 1fr); } }
.gallery-img { width: 100%; height: 150px; object-fit: cover; border-radius: var(--radius-sm); cursor: pointer; }
.gallery-img:hover { opacity: 0.85; }

.ext-link { font-size: 0.8rem; margin-left: 4px; }
.back-link { margin-top: 40px; }

/* --- Document List --- */
.doc-list { display: grid; gap: 12px; }
.doc-card {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
}
.doc-ext {
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; flex-shrink: 0;
  background: var(--color-primary-light); color: var(--color-primary);
  border-radius: var(--radius-sm); font-size: 0.75rem; font-weight: 700;
}
.doc-info h3 { font-size: 0.92rem; margin-bottom: 6px; line-height: 1.35; }
.offline-list { list-style: disc; padding-left: 24px; }
.offline-list li { margin-bottom: 6px; }

/* --- Notes --- */
.notes-block { margin-top: 32px; padding: 20px; background: var(--color-bg-alt); border-radius: var(--radius); }
.notes-block h3 { margin-bottom: 10px; }
.notes-block ul { list-style: disc; padding-left: 20px; }
.notes-block li { margin-bottom: 6px; font-size: 0.88rem; color: var(--color-text-secondary); }

.page-desc { color: var(--color-text-secondary); margin-bottom: 28px; }

/* --- No result --- */
.no-result { text-align: center; padding: 40px; color: var(--color-text-secondary); font-size: 1.1rem; }

/* --- Footer --- */
.site-footer { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); padding: 40px 0 0; margin-top: 40px; }
.footer-inner { display: grid; gap: 30px; grid-template-columns: 1fr; }
@media (min-width: 768px) { .footer-inner { grid-template-columns: repeat(3, 1fr); } }
.footer-col h3 { font-size: 1rem; margin-bottom: 10px; color: var(--color-primary); }
.footer-col p, .footer-col li { font-size: 0.88rem; color: var(--color-text-secondary); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 6px; }
.footer-col a { color: var(--color-text-secondary); }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom { margin-top: 30px; padding: 16px 0; border-top: 1px solid var(--color-border); text-align: center; }
.footer-bottom p { font-size: 0.8rem; color: var(--color-text-secondary); }