/* ==========================================================================
   TÀI LIỆU CHO TRẺ - ULTRA-FAST & MODERN EDUCATIONAL DOWNLOAD THEME
   Fully Responsive (Desktop, Laptop, Tablet, Mobile) - Zero Overflow
   ========================================================================== */

:root {
  /* Primary & Accents */
  --primary: #059669;
  --primary-hover: #047857;
  --primary-light: #d1fae5;
  --primary-dark: #065f46;

  /* Orange Download Brand Color */
  --orange-download: #f97316;
  --orange-download-hover: #ea580c;
  --orange-download-dark: #c2410c;
  --orange-download-light: #ffedd5;

  --secondary: #f97316;
  --secondary-light: #ffedd5;
  --accent-blue: #2563eb;
  --accent-blue-light: #dbeafe;
  --accent-purple: #8b5cf6;
  --accent-purple-light: #ede9fe;
  --accent-pink: #ec4899;
  --accent-pink-light: #fce7f3;
  --accent-yellow: #f59e0b;
  --accent-yellow-light: #fef3c7;

  /* Neutrals */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-alt: #f1f5f9;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;

  /* Badges */
  --badge-pdf: #ef4444;
  --badge-doc: #2563eb;
  --badge-ppt: #ea580c;
  --badge-zip: #8b5cf6;
  --badge-img: #10b981;

  /* Typography & Layout */
  --font-main: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 35px -10px rgba(0,0,0,0.12);
  --shadow-orange: 0 6px 18px rgba(249, 115, 22, 0.4);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --container-width: 1320px;
}

[data-theme="dark"] {
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --bg-card-alt: #334155;
  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-light: #94a3b8;
  --border-color: #334155;
  --border-light: #1e293b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 10px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  position: relative;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
  border: none;
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  box-sizing: border-box;
}

/* ==========================================================================
   ORANGE DOWNLOAD BUTTONS (UNIVERSAL STYLING)
   ========================================================================== */

/* 1. Card Download Button */
.btn-card-download,
a.btn-card-download,
button.btn-card-download {
  flex: 1;
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%) !important;
  color: #ffffff !important;
  border: none !important;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 800;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.35);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-card-download svg,
a.btn-card-download svg {
  stroke: #ffffff !important;
  fill: none;
}

.btn-card-download:hover,
a.btn-card-download:hover {
  background: linear-gradient(135deg, #ea580c 0%, #c2410c 100%) !important;
  color: #ffffff !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(249, 115, 22, 0.5);
}

/* 2. Single Document Primary Download CTA */
.btn-download-primary,
a.btn-download-primary {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%) !important;
  color: #ffffff !important;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-size: 1.08rem;
  font-weight: 900;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 6px 22px rgba(249, 115, 22, 0.45);
  cursor: pointer;
  transition: var(--transition);
  animation: pulse-orange 2s infinite;
  border: none;
  text-decoration: none;
  width: 100%;
  box-sizing: border-box;
}

.btn-download-primary svg,
a.btn-download-primary svg {
  stroke: #ffffff !important;
  fill: none;
}

@keyframes pulse-orange {
  0% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.6); }
  70% { box-shadow: 0 0 0 12px rgba(249, 115, 22, 0); }
  100% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0); }
}

.btn-download-primary:hover,
a.btn-download-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #ea580c 0%, #c2410c 100%) !important;
  color: #ffffff !important;
  box-shadow: 0 8px 28px rgba(249, 115, 22, 0.55);
}

/* 3. Modal Ready Download Button */
.btn-modal-ready,
a.btn-modal-ready {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%) !important;
  color: #ffffff !important;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
  cursor: pointer;
  width: 100%;
  justify-content: center;
  border: none;
  text-decoration: none;
}

.btn-modal-ready svg,
a.btn-modal-ready svg {
  stroke: #ffffff !important;
  fill: none;
}

.btn-modal-ready:hover,
a.btn-modal-ready:hover {
  background: linear-gradient(135deg, #ea580c 0%, #c2410c 100%) !important;
  color: #ffffff !important;
  transform: translateY(-2px);
}

/* ==========================================================================
   HEADER & NAVIGATION BAR
   ========================================================================== */

.site-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.top-bar {
  background: linear-gradient(90deg, #059669, #0d9488, #2563eb);
  color: #ffffff;
  font-size: 0.83rem;
  padding: 6px 0;
  font-weight: 500;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-tags {
  display: flex;
  gap: 10px;
  align-items: center;
}

.top-bar-tag {
  background: rgba(255,255,255,0.22);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.header-main {
  padding: 12px 0;
}

.header-main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), #10b981);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
  flex-shrink: 0;
}

.logo-text .logo-title {
  font-size: 1.32rem;
  font-weight: 900;
  line-height: 1.15;
  color: var(--primary-dark);
  letter-spacing: -0.02em;
}

[data-theme="dark"] .logo-text .logo-title {
  color: #34d399;
}

.logo-text span {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-weight: 500;
  display: block;
}

/* Header Search */
.header-search {
  flex: 1;
  max-width: 500px;
  position: relative;
}

.search-form-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: 10px 46px 10px 18px;
  background: var(--bg-card-alt);
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-size: 0.9rem;
  transition: var(--transition);
}

.search-input:focus {
  background: var(--bg-card);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-light);
}

.search-btn {
  position: absolute;
  right: 5px;
  width: 34px;
  height: 34px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.search-btn:hover {
  background: var(--primary-hover);
  transform: scale(1.05);
}

/* Live Search Suggestions Dropdown */
.search-results-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  max-height: 380px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
}

.search-results-dropdown.active {
  display: block;
}

.search-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.search-item:hover {
  background: var(--bg-card-alt);
}

.search-item-thumb {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-alt);
  object-fit: cover;
  flex-shrink: 0;
}

.search-item-info {
  flex: 1;
}

.search-item-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}

.search-item-meta {
  font-size: 0.74rem;
  color: var(--text-muted);
  display: flex;
  gap: 8px;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle-btn, .mobile-menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-card-alt);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.theme-toggle-btn:hover, .mobile-menu-toggle:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.mobile-menu-toggle {
  display: none;
}

.btn-upload-req {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--secondary), #ea580c);
  color: white;
  padding: 9px 16px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
  transition: var(--transition);
  white-space: nowrap;
}

.btn-upload-req:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(249, 115, 22, 0.4);
}

/* ==========================================================================
   DESKTOP MEGA NAVIGATION BAR
   ========================================================================== */

.nav-bar {
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  position: relative;
}

.nav-menu {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2px;
  flex-wrap: nowrap;
}

.nav-item {
  position: relative;
  flex-shrink: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 11px 9px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link:hover, .nav-item.current-menu-item > .nav-link {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-link .menu-icon {
  font-size: 0.95rem;
}

.nav-link .arrow-icon {
  font-size: 0.65rem;
  transition: transform 0.2s ease;
}

.nav-item:hover > .nav-link .arrow-icon {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 250px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 1100;
}

.nav-item:hover > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.dropdown-item a:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding-left: 16px;
}

/* Mega Menu Dropdown */
.nav-item.has-mega-menu {
  position: static;
}

.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  width: 100%;
  background: var(--bg-card);
  border-top: 2px solid var(--primary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  padding: 24px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 1100;
}

.nav-item.has-mega-menu:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.mega-col-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.mega-sub-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mega-sub-list li a:hover {
  color: var(--primary);
  background: var(--primary-light);
  padding-left: 12px;
}

/* ==========================================================================
   HERO SEARCH & BANNER SECTION
   ========================================================================== */

.hero-section {
  background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 50%, #eff6ff 100%);
  padding: 42px 0 32px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
  width: 100%;
  box-sizing: border-box;
}

[data-theme="dark"] .hero-section {
  background: linear-gradient(135deg, #064e3b 0%, #0f172a 60%, #1e1b4b 100%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: white;
  border: 1px solid #a7f3d0;
  color: var(--primary-dark);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .hero-badge {
  background: #064e3b;
  border-color: #059669;
  color: #6ee7b7;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 14px;
  color: #064e3b;
  letter-spacing: -0.03em;
  word-break: break-word;
}

[data-theme="dark"] .hero-title {
  color: #f8fafc;
}

.hero-title .highlight {
  background: linear-gradient(120deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 24px;
}

.hero-search-box {
  max-width: 700px;
  position: relative;
  margin-bottom: 18px;
  width: 100%;
  box-sizing: border-box;
}

.hero-search-input-group {
  display: flex;
  background: var(--bg-card);
  padding: 6px 8px 6px 18px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  border: 2px solid #a7f3d0;
  transition: var(--transition);
  width: 100%;
  box-sizing: border-box;
}

.hero-search-input-group:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 6px var(--primary-light), var(--shadow-xl);
}

.hero-search-input {
  flex: 1;
  font-size: 1rem;
  background: transparent;
  color: var(--text-main);
  min-width: 0;
}

.hero-search-btn {
  background: linear-gradient(135deg, var(--primary), #059669);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  flex-shrink: 0;
}

.hero-search-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(5, 150, 105, 0.4);
}

.hero-trending-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.83rem;
}

.hero-trending-title {
  color: var(--text-muted);
  font-weight: 600;
}

.trending-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-weight: 600;
  transition: var(--transition);
  font-size: 0.82rem;
  white-space: nowrap;
}

.trending-pill:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary);
  transform: translateY(-1px);
}

/* Hero Stats Bar */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
  width: 100%;
  box-sizing: border-box;
}

.stat-card {
  background: var(--bg-card);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  box-sizing: border-box;
}

.stat-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.stat-num {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.15;
}

.stat-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ==========================================================================
   CATEGORY GRID SECTION
   ========================================================================== */

.section-block {
  padding: 42px 0;
  width: 100%;
  box-sizing: border-box;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 12px;
  gap: 16px;
  box-sizing: border-box;
}

.section-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.section-icon-badge {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.section-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  word-break: break-word;
}

.section-subtitle {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-top: 2px;
  word-break: break-word;
}

.view-all-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--primary);
  transition: var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.view-all-link:hover {
  color: var(--primary-hover);
  transform: translateX(4px);
}

/* 12 Categories Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
  width: 100%;
  box-sizing: border-box;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 12px;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  min-width: 0;
  box-sizing: border-box;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  opacity: 0;
  transition: var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.category-card:hover::before {
  opacity: 1;
}

.cat-icon-wrap {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.category-card:hover .cat-icon-wrap {
  transform: scale(1.12) rotate(4deg);
}

.cat-card-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 4px;
  word-break: break-word;
}

.cat-card-count {
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg-card-alt);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* ==========================================================================
   DOCUMENT CARDS & GRID
   ========================================================================== */

.documents-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  width: 100%;
  box-sizing: border-box;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  min-width: 0;
  box-sizing: border-box;
}

.doc-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: #fdba74;
}

.doc-thumb-wrap {
  position: relative;
  aspect-ratio: 4/3;
  background: var(--bg-card-alt);
  overflow: hidden;
  width: 100%;
}

.doc-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.doc-card:hover .doc-thumb {
  transform: scale(1.05);
}

.doc-format-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 3px 7px;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 800;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-sm);
  z-index: 2;
}

.doc-format-badge.pdf { background: var(--badge-pdf); }
.doc-format-badge.doc, .doc-format-badge.docx { background: var(--badge-doc); }
.doc-format-badge.ppt, .doc-format-badge.pptx { background: var(--badge-ppt); }
.doc-format-badge.zip { background: var(--badge-zip); }
.doc-format-badge.img, .doc-format-badge.png { background: var(--badge-img); }

.doc-free-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: #10b981;
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  z-index: 2;
}

.doc-grade-tag {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(4px);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  z-index: 2;
}

.doc-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  box-sizing: border-box;
}

.doc-category-link {
  font-size: 0.73rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 4px;
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-title {
  font-size: 0.94rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 8px;
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 2.7em;
  word-break: break-word;
}

.doc-title a:hover {
  color: var(--orange-download);
}

.doc-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--border-color);
  gap: 4px;
  flex-wrap: wrap;
}

.doc-meta-item {
  display: flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}

.doc-footer-action {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-card-preview {
  width: 36px;
  height: 36px;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}

.btn-card-preview:hover {
  background: var(--accent-blue-light);
  color: var(--accent-blue);
}

/* Tab Filters */
.tabs-filter {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tab-pill {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.tab-pill.active, .tab-pill:hover {
  background: var(--orange-download);
  color: white;
}

/* ==========================================================================
   SINGLE DOCUMENT PAGE (PERFECT RESPONSIVE & TEXT WRAPPING)
   ========================================================================== */

.single-doc-wrapper {
  padding: 28px 0 60px;
  width: 100%;
  box-sizing: border-box;
}

.breadcrumbs-bar {
  margin-bottom: 18px;
  width: 100%;
  box-sizing: border-box;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  word-break: break-word;
  max-width: 100%;
}

.breadcrumb-list a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  color: var(--text-light);
}

.single-doc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 28px;
  align-items: start;
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.single-doc-main {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  overflow: hidden;
}

.single-header-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
  width: 100%;
}

.single-doc-title {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 16px;
  word-break: break-word;
  overflow-wrap: break-word;
}

.single-sub-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.83rem;
  color: var(--text-muted);
  padding-bottom: 18px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
  width: 100%;
}

.single-sub-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* High Conversion Download Box */
.download-cta-box {
  background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
  border: 2px solid #fdba74;
  border-radius: var(--radius-md);
  padding: 22px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

[data-theme="dark"] .download-cta-box {
  background: linear-gradient(135deg, #431407 0%, #1e1b4b 100%);
  border-color: #ea580c;
}

.download-cta-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}

.download-cta-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--orange-download-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

[data-theme="dark"] .download-cta-title {
  color: #fdba74;
}

.download-specs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 18px;
  width: 100%;
  box-sizing: border-box;
}

.spec-item {
  background: var(--bg-card);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0,0,0,0.05);
  min-width: 0;
  box-sizing: border-box;
  overflow: hidden;
}

.spec-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.spec-val {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text-main);
  word-break: break-word;
  overflow-wrap: break-word;
}

.download-buttons-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  box-sizing: border-box;
}

.download-secondary-links {
  display: flex;
  gap: 8px;
  width: 100%;
  box-sizing: border-box;
}

.btn-download-sec {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  font-weight: 700;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: var(--transition);
  cursor: pointer;
  box-sizing: border-box;
  min-width: 0;
}

.btn-download-sec:hover {
  background: var(--bg-card-alt);
  border-color: var(--orange-download);
  color: var(--orange-download);
}

/* Document Previewer Box */
.doc-preview-box {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 28px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.doc-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 6px;
}

.doc-preview-title {
  font-size: 0.96rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 6px;
}

.preview-carousel-wrap {
  position: relative;
  background: white;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.preview-image-list {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  gap: 12px;
  padding: 12px;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.preview-image-item {
  scroll-snap-align: start;
  flex-shrink: 0;
  width: 220px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: var(--transition);
  box-sizing: border-box;
}

.preview-image-item:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.preview-image-item img {
  width: 100%;
  height: 290px;
  object-fit: cover;
}

/* Content & Typography (No Clipping & Word Wrapping) */
.single-content {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-main);
  margin-bottom: 32px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  word-break: break-word;
  overflow-wrap: break-word;
}

.single-content * {
  max-width: 100% !important;
  box-sizing: border-box !important;
  word-break: break-word !important;
  overflow-wrap: break-word !important;
}

.single-content h2 {
  font-size: 1.32rem;
  font-weight: 800;
  margin: 24px 0 12px;
  color: var(--text-main);
  position: relative;
  padding-left: 12px;
  word-break: break-word;
}

.single-content h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--orange-download);
  border-radius: var(--radius-full);
}

.single-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 18px 0 8px;
  word-break: break-word;
}

.single-content p {
  margin-bottom: 14px;
  word-break: break-word;
}

.single-content ul, .single-content ol {
  margin-bottom: 16px;
  padding-left: 20px;
  word-break: break-word;
}

.single-content ul li, .single-content ol li {
  list-style: disc;
  margin-bottom: 6px;
  word-break: break-word;
}

/* FAQ Section */
.faq-box {
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 32px;
  width: 100%;
  box-sizing: border-box;
}

.faq-box-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  word-break: break-word;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
  width: 100%;
  box-sizing: border-box;
}

.faq-question {
  padding: 12px 16px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  word-break: break-word;
  gap: 8px;
}

.faq-answer {
  padding: 0 16px 12px;
  font-size: 0.86rem;
  color: var(--text-muted);
  display: none;
  word-break: break-word;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(180deg);
}

/* Share Box */
.doc-share-box {
  margin-top: 32px;
  padding: 18px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  width: 100%;
  box-sizing: border-box;
}

.doc-share-info {
  min-width: 0;
}

.doc-share-info strong {
  display: block;
  font-size: 0.92rem;
  word-break: break-word;
}

.doc-share-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  word-break: break-word;
}

.doc-share-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-share-fb {
  background: #2563eb !important;
  color: white !important;
}

.btn-share-zalo {
  background: #0284c7 !important;
  color: white !important;
}

/* Sidebar Widgets */
.sidebar-sticky {
  position: sticky;
  top: 85px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
  box-sizing: border-box;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  width: 100%;
  box-sizing: border-box;
}

.widget-title {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-light);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.widget-doc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.widget-doc-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

.widget-doc-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.widget-doc-thumb {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.widget-doc-title {
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-word;
}

.widget-doc-title:hover {
  color: var(--orange-download);
}

.widget-doc-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
  display: flex;
  gap: 8px;
}

/* ==========================================================================
   CATEGORY & ARCHIVE PAGE
   ========================================================================== */

.archive-header-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  width: 100%;
  box-sizing: border-box;
}

.archive-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
  word-break: break-word;
}

.archive-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  max-width: 800px;
  word-break: break-word;
}

.subcategories-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  width: 100%;
  box-sizing: border-box;
}

.subcat-pill {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.83rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}

.subcat-pill:hover, .subcat-pill.active {
  background: var(--orange-download);
  color: white;
  border-color: var(--orange-download);
}

/* Filter & Sort Bar */
.archive-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  margin-bottom: 20px;
  gap: 12px;
  width: 100%;
  box-sizing: border-box;
}

.filter-left, .filter-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.filter-select {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  cursor: pointer;
}

/* Pagination */
.pagination-wrapper {
  margin-top: 36px;
  display: flex;
  justify-content: center;
  width: 100%;
  box-sizing: border-box;
}

.page-numbers {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.page-numbers a, .page-numbers span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 10px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-main);
  transition: var(--transition);
}

.page-numbers a:hover, .page-numbers .current {
  background: var(--orange-download);
  color: white;
  border-color: var(--orange-download);
}

/* ==========================================================================
   DOWNLOAD MODAL DIALOG
   ========================================================================== */

.download-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-sizing: border-box;
}

.download-modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.download-modal-dialog {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  max-width: 460px;
  width: 100%;
  padding: 28px;
  box-shadow: var(--shadow-xl);
  text-align: center;
  position: relative;
  transform: scale(0.92);
  transition: var(--transition);
  box-sizing: border-box;
}

.download-modal-backdrop.active .download-modal-dialog {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
}

.modal-timer-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 4px solid #ffedd5;
  border-top-color: #f97316;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.8rem;
  font-weight: 900;
  color: #f97316;
  animation: spin-pulse 1s linear infinite;
}

.modal-timer-num {
  animation: none;
}

.modal-doc-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 6px;
  word-break: break-word;
}

.modal-tip {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  word-break: break-word;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 48px 0 20px;
  margin-top: auto;
  font-size: 0.88rem;
  width: 100%;
  box-sizing: border-box;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 32px;
  margin-bottom: 40px;
  width: 100%;
  box-sizing: border-box;
}

.footer-col-title {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 6px;
}

.footer-col-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--orange-download);
}

.footer-about p {
  line-height: 1.65;
  margin-bottom: 14px;
  font-size: 0.85rem;
  word-break: break-word;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links li a {
  color: #94a3b8;
  transition: var(--transition);
}

.footer-links li a:hover {
  color: #fdba74;
  padding-left: 6px;
}

.footer-social-box {
  background: #1e293b;
  border-radius: var(--radius-md);
  padding: 14px;
  border: 1px solid #334155;
  box-sizing: border-box;
}

.footer-social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #0284c7;
  color: white;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  margin-top: 8px;
  transition: var(--transition);
}

.footer-social-btn:hover {
  background: #0369a1;
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #64748b;
  flex-wrap: wrap;
  gap: 12px;
}

/* Sticky Mobile Bottom Bar */
.mobile-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 8px 10px;
  z-index: 999;
  box-shadow: 0 -4px 15px rgba(0,0,0,0.06);
  width: 100%;
  box-sizing: border-box;
}

.mobile-bottom-nav {
  display: flex;
  align-items: center;
  justify-content: space-around;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
}

.mobile-nav-item.active, .mobile-nav-item:hover {
  color: var(--orange-download);
}

.mobile-nav-icon {
  font-size: 1.25rem;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 75px;
  right: 18px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--orange-download);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 900;
  font-size: 1.1rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   MOBILE DRAWER MENU
   ========================================================================== */

.mobile-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-drawer-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  left: -320px;
  width: 300px;
  max-width: 85vw;
  background: var(--bg-card);
  z-index: 1510;
  box-shadow: var(--shadow-xl);
  overflow-y: auto;
  transition: left 0.3s ease;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

.mobile-drawer.active {
  left: 0;
}

.drawer-header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-menu-list {
  padding: 10px;
}

.drawer-menu-item {
  border-bottom: 1px solid var(--border-light);
}

.drawer-menu-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 8px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-main);
}

.drawer-sub-list {
  padding-left: 12px;
  padding-bottom: 6px;
  display: none;
}

.drawer-menu-item.open .drawer-sub-list {
  display: block;
}

.drawer-sub-link {
  display: block;
  padding: 6px 8px;
  font-size: 0.83rem;
  color: var(--text-muted);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (DESKTOP, LAPTOP, TABLET, MOBILE)
   ========================================================================== */

/* 1. Large Laptops / Small Desktops (1024px - 1280px) */
@media (max-width: 1280px) {
  .nav-link {
    padding: 10px 6px;
    font-size: 0.82rem;
    gap: 3px;
  }
  .nav-link .menu-icon {
    font-size: 0.85rem;
  }
  .categories-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .documents-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

/* 2. Tablets & Small Laptops (769px - 1024px) */
@media (max-width: 1024px) {
  .nav-bar {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .header-search {
    max-width: 360px;
  }
  .categories-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }
  .documents-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }
  .single-doc-grid {
    grid-template-columns: 100% !important;
    min-width: 0 !important;
  }
  .sidebar-sticky {
    position: static;
  }
}

/* 3. Mobile Devices (<= 768px) */
@media (max-width: 768px) {
  .container {
    padding-left: 14px !important;
    padding-right: 14px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .top-bar {
    display: none;
  }
  .mobile-bottom-bar {
    display: block;
  }
  body {
    padding-bottom: 75px;
  }
  
  .header-main {
    padding: 10px 0;
  }
  .header-search {
    display: none;
  }
  .btn-upload-req {
    display: none;
  }
  .logo-text .logo-title {
    font-size: 1.12rem;
  }
  .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }

  /* Hero Section Mobile */
  .hero-section {
    padding: 24px 0 20px;
  }
  .hero-title {
    font-size: 1.55rem;
    line-height: 1.25;
    margin-bottom: 10px;
  }
  .hero-desc {
    font-size: 0.88rem;
    margin-bottom: 16px;
  }
  .hero-search-input-group {
    padding: 4px 6px 4px 14px;
  }
  .hero-search-input {
    font-size: 0.88rem;
  }
  .hero-search-btn {
    padding: 10px 16px;
    font-size: 0.88rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 20px;
  }
  .stat-card {
    padding: 10px 12px;
  }
  .stat-icon {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }
  .stat-num {
    font-size: 1.05rem;
  }
  .stat-label {
    font-size: 0.7rem;
  }

  /* Categories Grid Mobile (3 columns) */
  .categories-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }
  .category-card {
    padding: 12px 6px;
  }
  .cat-icon-wrap {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
    margin-bottom: 6px;
  }
  .cat-card-name {
    font-size: 0.78rem;
    line-height: 1.2;
    margin-bottom: 2px;
  }
  .cat-card-count {
    font-size: 0.65rem;
    padding: 1px 6px;
  }

  /* Document Cards Mobile (2 columns) */
  .documents-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .doc-body {
    padding: 10px;
  }
  .doc-title {
    font-size: 0.82rem;
    height: 2.6em;
    line-height: 1.3;
    margin-bottom: 6px;
  }
  .doc-meta-row {
    font-size: 0.68rem;
    padding-top: 8px;
  }
  .doc-format-badge {
    font-size: 0.64rem;
    padding: 2px 6px;
  }
  .doc-free-badge {
    font-size: 0.64rem;
    padding: 2px 6px;
  }
  .doc-grade-tag {
    font-size: 0.64rem;
    padding: 2px 6px;
  }
  .btn-card-download {
    font-size: 0.76rem;
    padding: 7px 8px;
  }
  .btn-card-preview {
    width: 32px;
    height: 32px;
  }

  /* Single Document Page Mobile (100% width, No Cutoff) */
  .single-doc-wrapper {
    padding: 16px 0 40px;
  }
  .single-doc-grid {
    grid-template-columns: 100% !important;
    width: 100% !important;
    min-width: 0 !important;
    gap: 20px;
  }
  .single-doc-main {
    padding: 18px 14px !important;
    border-radius: var(--radius-md) !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    box-sizing: border-box !important;
  }
  .single-doc-title {
    font-size: 1.35rem !important;
    line-height: 1.35 !important;
    margin-bottom: 12px !important;
  }
  .single-sub-meta {
    gap: 8px !important;
    font-size: 0.76rem !important;
    padding-bottom: 12px !important;
    margin-bottom: 16px !important;
  }
  .download-cta-box {
    padding: 14px 12px !important;
    margin-bottom: 20px !important;
  }
  .download-specs-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 6px !important;
    margin-bottom: 12px !important;
  }
  .spec-item {
    padding: 6px 8px !important;
  }
  .spec-label {
    font-size: 0.65rem !important;
  }
  .spec-val {
    font-size: 0.82rem !important;
  }
  .btn-download-primary {
    padding: 13px 14px !important;
    font-size: 0.92rem !important;
  }
  .download-secondary-links {
    flex-direction: column !important;
    gap: 6px !important;
    width: 100% !important;
  }
  .btn-download-sec {
    width: 100% !important;
    padding: 8px 10px !important;
    font-size: 0.8rem !important;
  }

  /* Previewer on mobile */
  .doc-preview-box {
    padding: 12px 10px !important;
    margin-bottom: 20px !important;
  }
  .preview-image-list {
    padding: 8px !important;
    gap: 8px !important;
  }
  .preview-image-item {
    width: 150px !important;
  }
  .preview-image-item img {
    height: 200px !important;
  }

  /* Single Post Content on mobile */
  .single-content {
    font-size: 0.94rem !important;
    line-height: 1.7 !important;
    margin-bottom: 20px !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    overflow-wrap: break-word !important;
    word-break: break-word !important;
  }
  .single-content h2 {
    font-size: 1.15rem !important;
    margin: 18px 0 10px !important;
    padding-left: 10px !important;
  }
  .single-content h3 {
    font-size: 1.02rem !important;
    margin: 14px 0 6px !important;
  }
  .single-content p {
    margin-bottom: 12px !important;
  }
  .single-content ul, .single-content ol {
    padding-left: 18px !important;
    margin-bottom: 14px !important;
  }

  /* FAQ & Share on mobile */
  .faq-box {
    padding: 14px 12px !important;
    margin-top: 20px !important;
  }
  .faq-question {
    padding: 10px 12px !important;
    font-size: 0.86rem !important;
  }
  .faq-answer {
    padding: 0 12px 10px !important;
    font-size: 0.82rem !important;
  }
  .doc-share-box {
    flex-direction: column !important;
    align-items: flex-start !important;
    padding: 14px 12px !important;
    margin-top: 20px !important;
    gap: 10px !important;
  }
  .doc-share-buttons {
    width: 100% !important;
    gap: 6px !important;
  }

  /* Category Archive Mobile */
  .archive-header-box {
    padding: 16px 12px !important;
  }
  .archive-title {
    font-size: 1.35rem !important;
  }
  .subcategories-pills {
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    padding-bottom: 6px !important;
    -webkit-overflow-scrolling: touch !important;
    width: 100% !important;
  }
  .archive-filter-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 10px !important;
    padding: 10px 12px !important;
  }
  .filter-right .tabs-filter {
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    padding-bottom: 4px !important;
  }

  /* Footer Mobile */
  .footer-grid {
    grid-template-columns: 1fr !important;
    gap: 24px !important;
  }
}

/* 4. Small Mobile Devices (<= 400px) */
@media (max-width: 400px) {
  .container {
    padding-left: 10px !important;
    padding-right: 10px !important;
  }
  .single-doc-main {
    padding: 14px 10px !important;
  }
  .single-doc-title {
    font-size: 1.2rem !important;
  }
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .doc-meta-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }
  .download-specs-grid {
    gap: 4px !important;
  }
  .spec-item {
    padding: 5px 6px !important;
  }
  .spec-val {
    font-size: 0.76rem !important;
  }
}

/* ==========================================================================
   STATIC PAGES & LEGAL / POLICY LAYOUTS
   ========================================================================== */

.page-card-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin-top: 18px;
  box-shadow: var(--shadow-sm);
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.page-header {
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 16px;
}

.page-title {
  font-size: 1.85rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  word-break: break-word;
}

.page-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-card-alt);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.policy-nav-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  margin-top: 14px;
  -webkit-overflow-scrolling: touch;
  white-space: nowrap;
}

.policy-tab-link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
}

.policy-tab-link:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.policy-tab-link.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.single-content .lead {
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--text-main);
  background: var(--bg-card-alt);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 24px;
}

.single-content code {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.88rem;
  color: var(--orange-download-dark);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
  width: 100%;
}

@media (max-width: 600px) {
  .contact-grid {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 768px) {
  .page-card-content {
    padding: 20px 16px !important;
  }
  .page-title {
    font-size: 1.4rem !important;
  }
}