:root {
  --bg: #070c17;
  --bg-alt: #0b1120;
  --bg-card: #131c31;
  --border: #22304a;
  --text: #e6ebf5;
  --text-dim: #9aa7c2;
  --accent: #3ddc97;
  --accent-soft: rgba(61, 220, 151, 0.15);
  --accent-dim: #1f6f52;
  --danger: #ff6b6b;
  --radius: 10px;
  --max-width: 960px;
  --header-h: 64px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}

a { color: inherit; }

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 20px;
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(7, 12, 23, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.brand .logo {
  display: flex;
  color: var(--accent);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 0.98rem;
  letter-spacing: 0.3px;
}

.brand-text small {
  color: var(--text-dim);
  font-size: 0.72rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.92rem;
  transition: color 0.15s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
}

/* Menu quan tri (Quan tri / Doi mat khau) gom vao 1 icon nho, kin dao
   de khong lam giao dien thien ve "san pham quan ly" khi chia se cong khai. */
.admin-menu {
  position: relative;
}

.admin-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  cursor: pointer;
}

.admin-toggle:hover,
.admin-toggle[aria-expanded="true"] {
  color: var(--accent);
  border-color: var(--accent-dim);
}

.admin-links {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 168px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  display: none;
  flex-direction: column;
  gap: 2px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
  z-index: 60;
}

.admin-links.open {
  display: flex;
}

.admin-links a {
  padding: 9px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
}

.admin-links a:hover {
  background: var(--bg-alt);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 20px 96px;
  text-align: center;
  background: radial-gradient(ellipse at top, #0f1a30 0%, var(--bg) 65%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(61, 220, 151, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 220, 151, 0.07) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse at top, black 0%, transparent 70%);
  pointer-events: none;
}

/* Banner anh noi bat, chon tay tu kho anh trong /admin */
.banner {
  position: relative;
  max-width: var(--max-width);
  height: clamp(200px, 32vw, 380px);
  margin: 0 auto 36px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.banner[hidden] { display: none; }

.banner-track {
  position: relative;
  width: 100%;
  height: 100%;
}

.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.7s ease;
  cursor: pointer;
}

.banner-slide.active {
  opacity: 1;
  z-index: 1;
}

.banner-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.banner-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 34px 20px 14px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: #fff;
  text-align: left;
  font-size: 0.86rem;
}

.banner-caption strong {
  display: block;
  font-size: 0.98rem;
  margin-bottom: 2px;
}

.banner-dots {
  position: absolute;
  bottom: 12px;
  right: 16px;
  z-index: 2;
  display: flex;
  gap: 6px;
}

.banner-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: width 0.25s ease, background 0.25s ease;
}

.banner-dot.active {
  width: 20px;
  border-radius: 4px;
  background: var(--accent);
}

.hero-inner {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
}

.hero-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-dim);
  margin-bottom: 22px;
  box-shadow: 0 0 40px var(--accent-soft);
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: 0.3px;
}

.hero p {
  color: var(--text-dim);
  margin: 0 auto 28px;
  max-width: 520px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #06120c;
  background: var(--accent);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 999px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-soft);
}

.stats-row {
  position: relative;
  max-width: var(--max-width);
  margin: 48px auto 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 12px;
}

.stat-tile strong {
  display: block;
  font-size: 1.6rem;
  color: var(--accent);
  letter-spacing: 0.3px;
}

.stat-tile span {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---------- About ---------- */

.about {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about h2 {
  margin: 0 0 12px;
  font-size: 1.5rem;
}

.about > .section-inner > p {
  color: var(--text-dim);
  max-width: 640px;
}

.partner-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
}

.partner-badge {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  max-width: 100%;
}

.badge-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 4px;
}

.partner-badge span {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.about-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.point {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  font-size: 0.92rem;
}

.point-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--accent);
}

.directive-basis {
  margin-top: 28px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-dim);
  border-radius: var(--radius);
}

.directive-basis h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.directive-basis ul {
  margin: 0;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.directive-basis li {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.55;
}

.directive-basis strong {
  color: var(--text);
}

/* ---------- Timeline section ---------- */

.timeline-section h2 {
  margin: 0 0 6px;
  font-size: 1.5rem;
}

.section-hint {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0 0 20px;
}

.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.category-pill {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.category-pill:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

.category-pill.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #06120c;
  font-weight: 600;
}

.event-card.filtered-out {
  display: none;
}

.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 2px solid var(--border);
}

.loading, .empty, .error {
  color: var(--text-dim);
  padding: 20px 0;
}

.error { color: var(--danger); }

.event-card {
  position: relative;
  margin-bottom: 20px;
}

.event-dot {
  position: absolute;
  left: -34px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.event-summary {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  text-align: left;
  color: var(--text);
  font: inherit;
}

.event-card.open .event-summary {
  border-color: var(--accent-dim);
}

.event-summary-text {
  flex: 1;
  min-width: 0;
}

.event-date {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.4px;
  margin-bottom: 4px;
}

.event-title {
  margin: 0 0 4px;
  font-size: 1.08rem;
}

.event-location {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.event-category {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2px;
  vertical-align: middle;
}

.toggle-icon {
  flex-shrink: 0;
  color: var(--text-dim);
  transition: transform 0.25s ease;
}

.event-card.open .toggle-icon {
  transform: rotate(180deg);
  color: var(--accent);
}

.event-panel {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.25s ease;
}

.event-card.open .event-panel {
  max-height: 3000px;
  opacity: 1;
}

.event-panel-inner {
  padding: 16px 18px 4px;
}

.event-body { color: var(--text); font-size: 0.96rem; }
.event-body p { margin: 0 0 10px; }
.event-body ul { margin: 0 0 10px 20px; padding: 0; }
.event-body a { color: var(--accent); }

.event-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: 4px 0 14px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #000;
}

.event-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.event-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 8px;
  margin: 4px 0 14px;
}

.event-gallery img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: zoom-in;
  transition: transform 0.15s ease;
}

.event-gallery img:hover { transform: scale(1.03); }

.event-link {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
}

.event-link:hover { text-decoration: underline; }

/* ---------- Footer (gon, trang trong, dung nhan dien Hoc vien/CAND) ---------- */

.site-footer {
  border-top: 2px solid var(--accent-dim);
  background: var(--bg-alt);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 20px;
  text-align: center;
}

.footer-line-1 {
  margin: 0 0 2px;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--text);
}

.footer-line-2 {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.3px;
  color: var(--text-dim);
}

.footer-sep {
  margin: 0 6px;
  color: var(--border);
}

/* ---------- Lightbox ---------- */

.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
  padding: 30px;
  z-index: 100;
  cursor: zoom-out;
}

.lightbox.active { display: flex; }

.lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 6px;
}

/* ---------- Link modal (xem link tham khao ngay trong trang) ---------- */

.link-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 110;
}

.link-modal.active { display: flex; }

.link-modal-box {
  width: 100%;
  max-width: 960px;
  height: 88vh;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.link-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.link-modal-title {
  font-size: 0.82rem;
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.link-modal-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.link-modal-newtab {
  font-size: 0.82rem;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
}

.link-modal-newtab:hover { text-decoration: underline; }

.link-modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

.link-modal-note {
  margin: 0;
  padding: 8px 14px;
  font-size: 0.78rem;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.link-modal-box iframe {
  flex: 1;
  width: 100%;
  border: 0;
  background: #fff;
}

@media (max-width: 640px) {
  .link-modal { padding: 0; }
  .link-modal-box { max-width: none; height: 100vh; border-radius: 0; }
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .about-points { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .site-nav.open { max-height: 420px; }

  .site-nav a {
    padding: 14px 20px;
    border-top: 1px solid var(--border);
  }

  .admin-toggle { display: none; }

  .admin-links {
    position: static;
    display: flex;
    flex-direction: column;
    background: transparent;
    border: 0;
    box-shadow: none;
    padding: 0;
  }

  .section-inner { padding: 44px 18px; }
  .hero { padding: 64px 18px 72px; }
  .timeline { padding-left: 20px; }
  .event-dot { left: -26px; }
  .event-summary { align-items: flex-start; }

  .banner { margin: 0 auto 28px; border-radius: 8px; }
  .stats-row { margin-top: 32px; }
}