/* ================================================================
   RESPONSIVE.CSS — Complete Mobile-First Responsive System
   Breakpoints:
   - Mobile:   < 480px
   - Mobile+:  < 640px
   - Tablet:   < 768px
   - Laptop:   < 1024px
   - Desktop:  >= 1024px
================================================================ */

/* ---- MOBILE MENU DRAWER ELEMENTS ---- */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 900;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.mobile-menu-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.mobile-menu-drawer {
  position: fixed;
  top: 0;
  left: -100%;
  width: min(320px, 85vw);
  height: 100vh;
  background: #0d0d0d;
  z-index: 950;
  overflow-y: auto;
  transition: left 0.35s cubic-bezier(0.25, 1, 0.5, 1);
  display: flex;
  flex-direction: column;
}
.mobile-menu-drawer.open { left: 0; }
.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.mobile-menu-logo {
  font-family: 'Playfair Display', serif;
  color: #fff;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.mobile-menu-close {
  color: rgba(255,255,255,0.7);
  font-size: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}
.mobile-menu-links {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  flex: 1;
}
.mobile-menu-links a {
  display: block;
  padding: 16px 24px;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.75);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color 0.2s, background 0.2s;
}
.mobile-menu-links a:hover, .mobile-menu-links a.active {
  color: #fff;
  background: rgba(255,255,255,0.05);
}
.mobile-menu-footer {
  padding: 20px 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.72rem;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.05em;
}

/* ================================================================
   LAPTOP — max-width: 1024px
================================================================ */
@media (max-width: 1024px) {
  .container { padding: 0 20px; }
  .hero-title { font-size: 2.75rem; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .category-card { height: 380px; }
  .news-grid { grid-template-columns: 1fr; gap: 24px; }
  .featured-news-card { height: 380px; }
  .side-news-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .side-news-item {
    flex-direction: column;
    align-items: flex-start;
    padding-bottom: 0;
    border-bottom: none;
  }
  .side-news-thumb { width: 100%; height: 160px; }
  .top-listing { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .grid-listing { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .footer-top-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* ================================================================
   TABLET — max-width: 768px
================================================================ */
@media (max-width: 768px) {
  /* Top bar */
  .top-bar { display: none; }

  /* Header — fixed + frosted glass */
  .main-header {
    position: fixed;
    top: 0;
    background: rgba(10,10,10,0.93);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: 12px 0;
  }
  .header-container { gap: 12px; }
  .nav-menu-links { display: none; }
  .mobile-menu-overlay { display: block; }
  .brand-avatar-ring { width: 38px; height: 38px; }
  .brand-logo { font-size: 1.05rem; }
  .brand-tagline { font-size: 0.52rem; }

  /* Hero */
  .hero-section { height: 75vh; min-height: 440px; }
  .hero-title { font-size: 2rem; max-width: 100%; }
  .hero-stats-line { font-size: 0.68rem; }
  .hero-content { padding-bottom: 80px; }
  .hero-bottom-controls { right: 16px; bottom: 28px; padding: 8px 14px; gap: 12px; }

  /* Section */
  :root { --section-padding: 48px 0; }
  .section-title { font-size: 1.6rem; margin-bottom: 20px; }
  .section-header-flex { flex-wrap: wrap; gap: 12px; }

  /* Categories */
  .categories-grid { grid-template-columns: 1fr; gap: 12px; }
  .category-card { height: 260px; }

  /* Trending */
  .trending-card { width: 210px; }
  .trending-img-wrapper { height: 148px; }

  /* News */
  .featured-news-card { height: 320px; }
  .side-news-list { display: flex; flex-direction: column; gap: 14px; }
  .side-news-item { flex-direction: row; padding-bottom: 14px; border-bottom: 1px solid var(--color-border); }
  .side-news-thumb { width: 110px; height: 78px; }

  /* Podcast */
  .podcast-section-header { flex-direction: column; align-items: flex-start; gap: 6px; }
  .podcast-list { grid-template-columns: 1fr; gap: 16px; }
  .podcast-card-box { padding: 20px; }
  .podcast-title { font-size: 1.1rem; }

  /* Tabs */
  .tabs-header { gap: 2px; overflow-x: auto; padding-bottom: 0; }
  .tab-btn { padding: 12px 14px; font-size: 0.82rem; }

  /* Top listing */
  .top-listing { grid-template-columns: 1fr; gap: 12px; }
  .top-listing-card { height: 255px; }

  /* Grid listing — 2 col */
  .grid-listing { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .grid-card { height: 200px; }
  .grid-card h5 { font-size: 0.88rem; }
  .car-price { font-size: 0.76rem !important; }

  /* Footer */
  .footer-top-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom-bar { flex-direction: column; gap: 10px; text-align: center; }

  /* Zalo */
  .zalo-floating-btn { width: 52px; height: 52px; bottom: 20px; right: 16px; }
  .zalo-icon { font-size: 1.5rem; }
}

/* ================================================================
   MOBILE — max-width: 480px
================================================================ */
@media (max-width: 480px) {
  .container { padding: 0 14px; }

  /* Hero */
  .hero-section { height: 68vh; min-height: 360px; }
  .hero-title { font-size: 1.6rem; line-height: 1.22; }
  .hero-stats-line { font-size: 0.6rem; }
  .hero-bottom-controls { display: none; }
  .hero-content { padding-bottom: 60px; }

  /* Logo & Brand */
  .brand-avatar-ring { width: 34px; height: 34px; }
  .brand-logo { font-size: 0.92rem; letter-spacing: 0.08em; }
  .brand-tagline { font-size: 0.48rem; }

  /* Section */
  .section-title { font-size: 1.25rem; }

  /* Categories */
  .category-card { height: 210px; }
  .category-card-title { font-size: 1.25rem; }

  /* Trending */
  .trending-card { width: 165px; }
  .trending-img-wrapper { height: 125px; }
  .trending-price { font-size: 0.88rem; }
  .trending-title { font-size: 0.76rem; }

  /* Tabs */
  .tab-btn { padding: 10px 11px; font-size: 0.76rem; }

  /* Top listing → single */
  .top-listing-card { height: 220px; }
  .top-listing-info h4 { font-size: 1.1rem; }

  /* Grid listing → single col */
  .grid-listing { grid-template-columns: 1fr; gap: 10px; }
  .grid-card { height: 210px; }

  /* Side news */
  .side-news-thumb { width: 88px; height: 68px; }
  .side-news-title { font-size: 0.83rem; }
  .side-news-excerpt { display: none; }

  /* Sub-tabs */
  .sub-tabs-header { flex-wrap: wrap; gap: 8px; }
  .sub-tab-btn { font-size: 0.76rem; padding: 6px 13px; }

  /* Podcast */
  .podcast-card-box { padding: 18px 14px; }
  .podcast-desc { font-size: 0.76rem; }

  /* Footer */
  .footer-bottom-bar { font-size: 0.68rem; }

  /* Zalo */
  .zalo-floating-btn { width: 46px; height: 46px; bottom: 14px; right: 12px; }
  .zalo-icon { font-size: 1.25rem; }
}

/* ================================================================
   ARTICLE PAGE — article.html specific
================================================================ */
@media (max-width: 768px) {
  .article-header { padding: 100px 0 36px; }
  .article-title { font-size: 1.75rem !important; }
  .article-body { font-size: 1rem; }
  .magazine-quote {
    font-size: 1.15rem;
    padding: 20px 18px;
    margin: 24px auto;
    max-width: 100%;
  }
  .magazine-dropcap::first-letter {
    font-size: 3rem;
    padding-right: 8px;
  }
  .magazine-figure { margin: 22px 0; }
}
@media (max-width: 480px) {
  .article-title { font-size: 1.4rem !important; line-height: 1.2; }
  .magazine-quote { font-size: 0.95rem; padding: 14px; }
  .article-body h2 { font-size: 1.15rem; }
}

/* ================================================================
   TOUCH DEVICE — disable hover transforms for performance
================================================================ */
@media (hover: none) {
  .category-card:hover .category-card-bg,
  .featured-news-card:hover .featured-news-bg,
  .trending-card:hover .trending-img-wrapper img,
  .grid-card:hover .grid-img img,
  .top-listing-card:hover .top-listing-img,
  .side-news-item:hover .side-news-thumb img { transform: none !important; }
}

/* ================================================================
   UTILITIES — Scroll-smooth, scrollbar hide on mobile tab headers
================================================================ */
.tabs-header::-webkit-scrollbar { display: none; }
.tabs-header { -ms-overflow-style: none; scrollbar-width: none; }