/* ============================
   RESET
============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;

    /* Light mode variables */
    --bg: #ffffff;
    --bg-card: #f5f5f5;
    --text: #333;
    --header-bg: rgba(0,0,0,0.35);
    --header-bg-scroll: rgba(0,0,0,0.55);
    --nav-color: #fff;
}

/* Dark mode variables */
body.dark {
    --bg: #0f0f0f;
    --bg-card: #1a1a1a;
    --text: #e6e6e6;
    --header-bg: rgba(0,0,0,0.35);
    --header-bg-scroll: rgba(0,0,0,0.55);
    --nav-color: #fff;
}

body {
    background: var(--bg);
    color: var(--text);
}

/* ============================
   CONTAINER
============================ */
.container {
    width: 92%;
    max-width: 1200px;
    margin: auto;
}

/* ============================
   HEADER (A1 — TRANSPARENT)
============================ */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 16px 0;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    transition: all 0.25s ease;
}

.header.shrink {
    padding: 10px 0;
    background: var(--header-bg-scroll);
}

/* Header inner */
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo img {
    height: 60px;
    width: auto;
    transition: 0.25s ease;
}

.header.shrink .logo img {
    height: 90px !important;
    transform: scale(1.15);
}

/* Navigation */
.nav {
    display: flex;
    gap: 32px;
}

.nav a {
    text-decoration: none;
    color: var(--nav-color);
    font-weight: 500;
    opacity: 0.85;
    transition: 0.25s ease;
}

.nav a:hover {
    opacity: 1;
}

/* Header icons */
.header-icons {
    display: flex;
    gap: 16px;
    align-items: center;
}

.header-icons button {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--nav-color);
}

/* ============================
   HERO SECTION (TRANG CHỦ)
============================ */
.hero-img {
    width: 100%;
    height: 360px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.hero-desc {
    font-size: 1.2rem;
    opacity: 0.85;
}

/* ============================
   SECTION SPACING
============================ */
.section-block {
    margin-top: 100px;
}

.section-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, #d4af37, transparent);
  margin: 40px 0;
}

/* ============================
   NEWS GRID
============================ */
.news-grid {
    margin-top: 40px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.news-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    transition: 0.25s ease;
}

.news-card:hover {
    transform: translateY(-4px);
    background: #222;
}

.news-card img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 12px;
}

/* ============================
   BLOG PAGE
============================ */
.blog-header {
    text-align: center;
    margin: 120px 0 40px;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 30px;
}

.blog-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    transition: 0.25s ease;
}

.blog-card:hover {
    transform: translateY(-4px);
    background: #222;
}

.read-more {
    color: #4da3ff;
    font-weight: 600;
}

/* ============================
   FOOTER
============================ */
.footer {
    margin-top: 60px;
    padding: 30px 0;
    text-align: center;
    background: #111;
    border-top: 1px solid #222;
}

.footer a {
    color: #ccc;
    text-decoration: none;
}

.footer a:hover {
    color: #ff4d4d;
}

/* ============================
   RESPONSIVE — TABLET + MOBILE
============================ */

/* Tablet (iPad, Samsung Tab) */
@media (max-width: 900px) {
    .nav {
        gap: 20px;
    }
}

/* Mobile (iPhone, Samsung) */
@media (max-width: 600px) {

    .header-inner {
        flex-direction: column;
        gap: 12px;
    }

    .logo img {
        height: 52px;
    }

    .header-icons {
        position: absolute;
        top: 10px;
        right: 14px;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 14px;
        margin-top: 6px;
    }

    .nav a {
        padding: 6px 0;
    }
}

/* ============================
   FLAGS
============================ */
.flag-icon {
    width: 22px;
    height: 22px;
}
/* ============================
   Visttor Statistics
============================ */
#stats-box {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(20,20,20,0.85);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 4px 18px rgba(0,0,0,0.4);
  color: #fff;
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 14px;
  z-index: 999;
  backdrop-filter: blur(6px);
  opacity: 0;
  transform: translateY(10px);
  animation: fadeInStats 0.6s ease-out forwards;
}

@keyframes fadeInStats {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
/* ============================
   Toogle for guest counter
============================ */
#toggle-stats {
  position: fixed;
  bottom: 20px;
  right: 160px;
  background: #222;
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  opacity: 0.8;
}
#toggle-stats:hover {
  opacity: 1;
}