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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
}

/* Hang 1: logo + ten thuong hieu, can giua, rieng 1 hang - kieu masthead
   bao dien tu (vd Cong an nhan dan). */
.header-brand-row {
  height: var(--header-brand-h);
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 17px;
  text-decoration: none;
  color: var(--text);
}

.brand .logo {
  display: flex;
  flex-shrink: 0;
}

.brand .logo img {
  width: 78px;
  height: 78px;
  object-fit: contain;
  /* Lam sang, ro net hon tren nen ca 2 theme - huy hieu goc hoi tram. */
  filter: brightness(1.2) saturate(1.14) contrast(1.05) drop-shadow(0 5px 12px rgba(0, 0, 0, 0.2));
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  font-size: 1.05em;
}

.brand-line1,
.brand-line2 {
  font-size: clamp(1.5rem, 5.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  line-height: 1;
}

.brand-line2 {
  color: var(--gold);
}

/* Hang 2: thanh dieu huong mau accent, rieng 1 khung - kieu bao dien tu. */
.header-nav-row {
  background: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  text-decoration: none;
  color: var(--on-accent);
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  transition: color 0.15s ease;
}

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

/* Ngan cach nhe giua cac muc menu chinh, khong ap dung cho theme-toggle/
   admin-menu (da co khung rieng). */
.site-nav > a {
  position: relative;
}

.site-nav > a:not(:first-child)::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 14px;
  background: rgba(255, 255, 255, 0.3);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  color: var(--on-accent);
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--gold);
  border-color: var(--gold);
}

.theme-toggle .theme-icon-sun { display: none; }
.theme-toggle .theme-icon-moon { display: flex; }
:root[data-theme="light"] .theme-toggle .theme-icon-sun { display: flex; }
:root[data-theme="light"] .theme-toggle .theme-icon-moon { display: none; }

/* Truy cap nhanh tren mobile (Gioi thieu/Tuyen truyen/Bo ky nang) - chi hien
   duoi nguong 940px, xem quy tac o media query ben duoi. Tren desktop cac
   muc nay da co san dang chu trong .site-nav nen an di o day. */
.mobile-quick-nav {
  display: none;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.mobile-quick-nav::-webkit-scrollbar {
  display: none;
}

.mobile-quick-link {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 7px 12px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  color: var(--on-accent);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
}

.mobile-quick-link:hover,
.mobile-quick-link:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

/* Menu "Them" gop chung: 4 muc noi dung con lai (Doi moi sang tao, Khac,
   Nghien cuu khoa hoc, Kiem tra nhanh) + 2 muc quan tri, ngan cach bang
   .admin-links-sep. Gop vao 1 icon nho theo yeu cau nguoi dung, thay vi 2
   nut rieng nhu truoc. */
.admin-menu {
  position: relative;
}

.admin-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  color: var(--on-accent);
  cursor: pointer;
}

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

.admin-links {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 210px;
  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;
  color: var(--text);
}

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

.admin-links-sep {
  height: 1px;
  margin: 4px 6px;
  background: var(--border);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--on-accent);
  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: 28px 20px 96px;
  text-align: center;
  background: radial-gradient(ellipse at top, var(--hero-glow) 0%, var(--bg) 65%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(214, 40, 40, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(214, 40, 40, 0.08) 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: 760px;
  margin: 0 auto;
}

/* Carousel chay ngang qua lai giua huy hieu va cac anh Banner, dang khoi
   banner chu nhat 16:9, cao va sat ngay duoi dai tin "Thoi su". Be rong co
   dinh (khong con dong bo theo chu tieu de - qua nho so voi 1 khoi banner).
   Slide moi truot vao tu phai, slide cu truot ra trai (xem setupHeroCarousel
   trong main.js). */
.hero-icon {
  position: relative;
  display: block;
  width: min(720px, 94vw);
  aspect-ratio: 16 / 9;
  margin: 0 auto 24px;
  border-radius: 14px;
  overflow: hidden;
  filter: drop-shadow(0 0 28px var(--accent-soft));
}

.hero-icon img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translateX(100%);
  transition: transform 0.9s ease;
}

.hero-icon img[data-logo="true"] {
  object-fit: contain;
  padding: 8%;
}

.hero-icon img.is-active { transform: translateX(0); }
.hero-icon img.is-prev { transform: translateX(-100%); }

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  letter-spacing: 0.3px;
  white-space: nowrap;
}

@media (max-width: 460px) {
  .hero h1 { white-space: normal; }
}

.hero p {
  color: var(--text-dim);
  margin: 0 auto 28px;
  max-width: 680px;
  white-space: pre-line;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--on-accent);
  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(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

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

.stat-icon {
  display: inline-block;
  width: 22px;
  height: 22px;
  margin-bottom: 6px;
  color: var(--gold);
}

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

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

.stat-tile-link {
  width: 100%;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.stat-tile-link:hover,
.stat-tile-link:focus-visible {
  transform: translateY(-2px);
}

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

@media (max-width: 640px) {
  .stats-row { margin-top: 32px; }
}