/*
Theme Name: LaiHay v2
Theme URI: https://laihay.vn
Author: Antigravity
Author URI: https://laihay.vn
Description: Theme Material Design 3 × Bento Grid cho LaiHay.vn — Vanilla CSS, hiệu năng cao.
Version: 2.0.0
Text Domain: laihay
*/

/* ============================================================
   1. DESIGN TOKENS — Material You Color System
   ============================================================ */
:root {
  /* Brand Colors */
  --primary: #B83A3A;
  --primary-rgb: 184, 58, 58;
  --primary-hover: #9E2A2A;
  --primary-light: #F2DCDC;
  --on-primary: #FFFFFF;

  --secondary: #4A6FA5;
  --secondary-rgb: 74, 111, 165;
  --on-secondary: #FFFFFF;

  --tertiary: #4A8F6D;
  --on-tertiary: #FFFFFF;

  /* Surfaces */
  --surface: #FFFFFF;
  --surface-rgb: 255, 255, 255;
  --surface-dim: #F5F2F0;
  --surface-container: #F0EDEB;
  --surface-container-high: #EAE7E5;
  --surface-variant: #E8E0DC;
  --on-surface: #1C1B1F;
  --on-surface-variant: #5F5E62;

  --outline: rgba(0, 0, 0, 0.08);
  --outline-variant: rgba(0, 0, 0, 0.05);
  --background: #FBF8F6;
  --on-background: #1C1B1F;

  /* Elevation Shadows - Premium Layered */
  --shadow-1: 0 2px 5px rgba(0,0,0,0.04), 0 5px 15px rgba(0,0,0,0.03);
  --shadow-2: 0 4px 10px rgba(0,0,0,0.05), 0 10px 25px rgba(0,0,0,0.05), 0 15px 40px rgba(0,0,0,0.03);
  --shadow-3: 0 10px 20px rgba(0,0,0,0.06), 0 20px 40px rgba(0,0,0,0.06), 0 40px 80px rgba(0,0,0,0.04);
  --shadow-primary: 0 8px 24px rgba(var(--primary-rgb), 0.35), 0 2px 8px rgba(var(--primary-rgb), 0.2);

  /* Radius — Material 3 */
  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;

  /* Transitions - Snappy & Smooth */
  --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --duration-short: 0.25s;
  --duration-medium: 0.4s;
  --duration-long: 0.6s;
}

/* ============================================================
   2. DARK MODE
   ============================================================ */
[data-theme="dark"] {
  --primary: #E07070;
  --primary-rgb: 224, 112, 112;
  --primary-hover: #F09090;
  --primary-light: #3D2020;
  --on-primary: #1A1A1A;

  --secondary: #8CB4E0;
  --on-secondary: #1A1A1A;

  --surface: #1E1E1E;
  --surface-rgb: 30, 30, 30;
  --surface-dim: #161616;
  --surface-container: #252525;
  --surface-container-high: #2E2E2E;
  --surface-variant: #3A3A3A;
  --on-surface: #E6E1E5;
  --on-surface-variant: #A0A0A0;

  --outline: rgba(255, 255, 255, 0.08);
  --outline-variant: rgba(255, 255, 255, 0.04);
  --background: #121212;
  --on-background: #E6E1E5;

  --shadow-1: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-2: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-3: 0 10px 30px rgba(0,0,0,0.5);
  --shadow-primary: 0 6px 20px rgba(var(--primary-rgb), 0.25);
}

/* ============================================================
   3. RESET & BASE
   ============================================================ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--background);
  color: var(--on-background);
  line-height: 1.7;
  transition: background-color var(--duration-medium) var(--ease-standard),
              color var(--duration-medium) var(--ease-standard);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, .site-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--on-surface);
}

a { color: var(--primary); text-decoration: none; transition: color var(--duration-short); }
a:hover { color: var(--primary-hover); }

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

ul, ol { list-style: none; }

/* ============================================================
   4. LAYOUT
   ============================================================ */
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--sp-4); }

.section { padding: var(--sp-12) 0; }
.section-header { margin-bottom: var(--sp-8); }
.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'Outfit', sans-serif;
}
.section-subtitle {
  color: var(--on-surface-variant);
  margin-top: var(--sp-2);
  font-size: 1.05rem;
}

.site-main { margin-top: var(--sp-8); min-height: 60vh; }

/* Two Column Layout */
.layout-2col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
}
@media (min-width: 1024px) {
  .layout-2col { grid-template-columns: 1fr 340px; }
}

/* ============================================================
   5. GLASSMORPHISM HEADER
   ============================================================ */
.glass-header {
  background: rgba(var(--surface-rgb), 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--outline);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background var(--duration-medium), box-shadow var(--duration-medium);
}
.glass-header.scrolled {
  box-shadow: var(--shadow-2);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-3) 0;
  gap: var(--sp-4);
}

.site-branding { flex-shrink: 0; }
.site-branding .custom-logo-link img { height: 48px; width: auto; border-radius: 0; }
.site-branding .site-title {
  font-size: 1.4rem;
  margin: 0;
}
.site-branding .site-title a { color: var(--on-surface); }
.site-branding .site-description {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  margin: 0;
}

/* Desktop Nav */
.nav-menu {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
}
.nav-menu > li { position: relative; }
.nav-menu > li > a {
  color: var(--on-surface);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background var(--duration-short), color var(--duration-short);
}

/* Hardcoded Menu Icons */
.nav-menu > li > a::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    background-color: currentColor;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
    opacity: 0.85;
}
/* 1. Trang Chủ */
.nav-menu > li:nth-child(1) > a::before {
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M160-120v-480l320-240 320 240v480H560v-280H400v280H160Z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M160-120v-480l320-240 320 240v480H560v-280H400v280H160Z'/%3E%3C/svg%3E");
}
/* 2. Luyện thi GPLX */
.nav-menu > li:nth-child(2) > a::before {
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M320-240h320v-80H320v80Zm0-160h320v-80H320v80ZM240-80q-33 0-56.5-23.5T160-160v-640q0-33 23.5-56.5T240-880h320l240 240v480q0 33-23.5 56.5T720-80H240Zm280-520v-200H240v640h480v-440H520ZM240-800v200-200 640-640Z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M320-240h320v-80H320v80Zm0-160h320v-80H320v80ZM240-80q-33 0-56.5-23.5T160-160v-640q0-33 23.5-56.5T240-880h320l240 240v480q0 33-23.5 56.5T720-80H240Zm280-520v-200H240v640h480v-440H520ZM240-800v200-200 640-640Z'/%3E%3C/svg%3E");
}
/* 3. Kiến thức */
.nav-menu > li:nth-child(3) > a::before {
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M200-120q-33 0-56.5-23.5T120-200v-560q0-33 23.5-56.5T200-840h560q33 0 56.5 23.5T840-760v560q0 33-23.5 56.5T760-120H200Zm0-80h560v-560H200v560Zm80-80h400v-80H280v80Zm0-160h400v-80H280v80Zm0-160h400v-80H280v80Z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M200-120q-33 0-56.5-23.5T120-200v-560q0-33 23.5-56.5T200-840h560q33 0 56.5 23.5T840-760v560q0 33-23.5 56.5T760-120H200Zm0-80h560v-560H200v560Zm80-80h400v-80H280v80Zm0-160h400v-80H280v80Zm0-160h400v-80H280v80Z'/%3E%3C/svg%3E");
}
/* 4. Tin tức */
.nav-menu > li:nth-child(4) > a::before {
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M160-160q-33 0-56.5-23.5T80-240v-480q0-33 23.5-56.5T160-800h640q33 0 56.5 23.5T880-720v480q0 33-23.5 56.5T800-160H160Zm0-80h640v-480H160v480Zm0 0v-480 480Zm240-240h320v-80H400v80Zm0 120h320v-80H400v80ZM240-360h120v-120H240v120Z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M160-160q-33 0-56.5-23.5T80-240v-480q0-33 23.5-56.5T160-800h640q33 0 56.5 23.5T880-720v480q0 33-23.5 56.5T800-160H160Zm0-80h640v-480H160v480Zm0 0v-480 480Zm240-240h320v-80H400v80Zm0 120h320v-80H400v80ZM240-360h120v-120H240v120Z'/%3E%3C/svg%3E");
}
/* 5. Phụ lục (Nếu có) */
.nav-menu > li:nth-child(5) > a::before {
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M440-280h80v-240h-80v240Zm40-320q17 0 28.5-11.5T520-640q0-17-11.5-28.5T480-680q-17 0-28.5 11.5T440-640q0 17 11.5 28.5T480-600Zm0 520q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T763-197q-54 54-127 85.5T480-80Z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M440-280h80v-240h-80v240Zm40-320q17 0 28.5-11.5T520-640q0-17-11.5-28.5T480-680q-17 0-28.5 11.5T440-640q0 17 11.5 28.5T480-600Zm0 520q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T763-197q-54 54-127 85.5T480-80Z'/%3E%3C/svg%3E");
}

/* Submenu Arrow (Chevron Down) */
.nav-menu > li:has(ul.sub-menu) > a::after,
.nav-menu > li:has(.sub-menu) > a::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M480-360 280-560h400L480-360Z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 -960 960 960' fill='black'%3E%3Cpath d='M480-360 280-560h400L480-360Z'/%3E%3C/svg%3E");
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
    transition: transform 0.3s var(--ease-out);
    margin-left: 2px;
}
.nav-menu > li:has(ul.sub-menu):hover > a::after,
.nav-menu > li:has(.sub-menu):hover > a::after {
    transform: rotate(180deg);
}

.nav-menu > li > a:hover,
.nav-menu > li.current-menu-item > a {
  background: var(--surface-variant);
  color: var(--primary);
}

/* Dropdown */
.nav-menu .sub-menu {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  top: 100%;
  left: 0;
  background: rgba(var(--surface-rgb), 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--outline);
  padding: var(--sp-2);
  min-width: 240px;
  z-index: 1001;
  transform: translateY(12px) scale(0.96);
  transform-origin: top left;
  transition: all var(--duration-medium) var(--ease-out);
}
.nav-menu > li:hover > .sub-menu {
  visibility: visible;
  opacity: 1;
  transform: translateY(6px) scale(1);
}
.nav-menu .sub-menu li a {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--on-surface);
  border-radius: var(--radius-xs);
  transition: background var(--duration-short), padding-left var(--duration-short);
}
.nav-menu .sub-menu li a:hover {
  background: var(--surface-variant);
  color: var(--primary);
  padding-left: var(--sp-5);
}

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: var(--sp-2); }

.header-cta {
  background: var(--primary);
  color: var(--on-primary) !important;
  padding: var(--sp-2) var(--sp-5);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  transition: all var(--duration-short);
  white-space: nowrap;
}
.header-cta:hover {
  background: var(--primary-hover);
  color: var(--on-primary) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

/* Theme Toggle */
.theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  color: var(--on-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  transition: background var(--duration-short), transform var(--duration-short);
  position: relative;
  overflow: hidden;
}
.theme-toggle-btn:hover { background: var(--surface-variant); }
.theme-toggle-btn svg {
  position: absolute;
  width: 22px;
  height: 22px;
  transition: all var(--duration-medium) var(--ease-out);
}
.theme-toggle-btn .moon-icon { opacity: 0; transform: rotate(90deg) scale(0.5); }
.theme-toggle-btn .sun-icon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="dark"] .theme-toggle-btn .sun-icon { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="dark"] .theme-toggle-btn .moon-icon { opacity: 1; transform: rotate(0) scale(1); }

/* Hamburger Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  position: relative;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: background var(--duration-short);
}
.menu-toggle:hover { background: var(--surface-variant); }
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--on-surface);
  border-radius: 2px;
  transition: all var(--duration-medium) var(--ease-out);
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Nav Drawer */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--duration-medium);
}
.mobile-nav-overlay.active { opacity: 1; }

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  right: -300px;
  width: 300px;
  height: 100vh;
  background: var(--surface);
  z-index: 1001;
  padding: var(--sp-8) var(--sp-6);
  overflow-y: auto;
  transition: right var(--duration-medium) var(--ease-out);
  box-shadow: var(--shadow-3);
}
.mobile-nav.active { right: 0; }
.mobile-nav ul { display: flex; flex-direction: column; gap: var(--sp-1); }
.mobile-nav ul li a {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  color: var(--on-surface);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background var(--duration-short);
}
.mobile-nav ul li a:hover { background: var(--surface-variant); color: var(--primary); }
.mobile-nav .sub-menu {
  padding-left: var(--sp-4);
  margin-top: var(--sp-1);
}
.mobile-nav .sub-menu li a {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

/* ============================================================
   6. CARDS — Material 3 System
   ============================================================ */
.card {
  background: var(--surface);
  color: var(--on-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  border: 1px solid var(--outline);
  overflow: hidden;
  position: relative;
  transition: all var(--duration-medium) var(--ease-bounce);
}
.card:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-6px);
  border-color: rgba(var(--primary-rgb), 0.3);
}

.card-elevated {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  border: none;
  overflow: hidden;
  transition: all var(--duration-medium) var(--ease-out);
}
.card-elevated:hover {
  box-shadow: var(--shadow-3);
  transform: translateY(-4px);
}

.card-filled {
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  border: none;
  overflow: hidden;
  transition: all var(--duration-medium) var(--ease-out);
}

.card-body { padding: var(--sp-6); }
.card-body-sm { padding: var(--sp-4); }

/* Glass Card */
.glass-card {
  background: rgba(var(--surface-rgb), 0.6) !important;
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
}
[data-theme="dark"] .glass-card {
  border-color: rgba(255, 255, 255, 0.06) !important;
  background: rgba(var(--surface-rgb), 0.5) !important;
}

/* Post Card */
.post-card { display: flex; flex-direction: column; }
.post-card .post-thumb {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.post-card .post-thumb img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 0;
  transition: transform var(--duration-long) var(--ease-out);
}
.post-card:hover .post-thumb img { transform: scale(1.06); }
.post-card .post-card-body {
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.post-card .post-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  background: var(--primary-light);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--sp-3);
  width: fit-content;
}
.post-card .post-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: var(--sp-2);
}
.post-card .post-title a { color: var(--on-surface); }
.post-card .post-title a:hover { color: var(--primary); }
.post-card .post-excerpt {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: var(--sp-3);
}
.post-card .post-meta {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.post-card .post-meta svg { width: 14px; height: 14px; }

/* Tool Card */
.tool-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--sp-8) var(--sp-4);
  text-decoration: none;
  color: var(--on-surface);
}
.tool-card .tool-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-4);
  transition: transform var(--duration-medium) var(--ease-out), background var(--duration-medium);
}
.tool-card .tool-icon svg {
  width: 32px;
  height: 32px;
  color: var(--primary);
  transition: color var(--duration-short);
}
.tool-card:hover .tool-icon {
  transform: scale(1.15) rotate(-5deg);
  background: var(--primary);
  box-shadow: var(--shadow-primary);
}
.tool-card:hover .tool-icon svg { color: var(--on-primary); }
.tool-card .tool-title {
  font-size: 1rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
}

/* Feature Card */
.feature-card {
  padding: var(--sp-6);
  text-align: center;
}
.feature-card .feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}
.feature-card .feature-icon svg { width: 40px; height: 40px; }
.feature-card .feature-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: var(--sp-2);
  font-family: 'Outfit', sans-serif;
}
.feature-card .feature-desc {
  font-size: 0.88rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* CTA Card */
.cta-card {
  background: var(--primary) !important;
  color: var(--on-primary);
  padding: var(--sp-8) var(--sp-6);
  text-align: center;
  border: none !important;
}
.cta-card:hover { background: var(--primary-hover) !important; }
.cta-card .cta-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--on-primary);
}
.cta-card .cta-icon svg { width: 40px; height: 40px; }
.cta-card .cta-title {
  font-size: 1.05rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  color: var(--on-primary);
}

/* ============================================================
   7. BUTTONS
   ============================================================ */
.btn-filled {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--primary);
  color: var(--on-primary) !important;
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--duration-short) var(--ease-out);
  font-family: 'Inter', sans-serif;
  text-decoration: none;
}
.btn-filled:hover {
  background: var(--primary-hover);
  color: var(--on-primary) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary);
}

.btn-outlined {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: transparent;
  color: var(--primary);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid var(--primary);
  cursor: pointer;
  transition: all var(--duration-short);
  text-decoration: none;
}
.btn-outlined:hover {
  background: var(--primary);
  color: var(--on-primary);
}

.btn-tonal {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--primary-light);
  color: var(--primary);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--duration-short);
  text-decoration: none;
}
.btn-tonal:hover { filter: brightness(0.95); transform: translateY(-1px); }

/* Legacy support */
.btn-primary { 
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--primary);
  color: var(--on-primary) !important;
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-full);
  font-weight: 700;
  transition: all var(--duration-short) var(--ease-out);
  box-shadow: var(--shadow-primary);
  font-family: 'Outfit', sans-serif;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(var(--primary-rgb), 0.45);
  color: var(--on-primary) !important;
  background: var(--primary-hover);
}

/* ============================================================
   7.5. FORMS & INPUTS
   ============================================================ */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="tel"],
input[type="url"],
textarea,
select {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--on-surface);
  background: rgba(var(--surface-rgb), 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--outline);
  border-radius: var(--radius-full);
  transition: all var(--duration-short) var(--ease-out);
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02);
}

textarea {
  border-radius: var(--radius-md);
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.15);
}

input::placeholder,
textarea::placeholder {
  color: var(--on-surface-variant);
  opacity: 0.7;
}

/* Glass Search Form (Tra cứu phạt nguội) */
.glass-form-container {
  background: rgba(var(--surface-rgb), 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--outline);
  border-radius: var(--radius-xl);
  padding: var(--sp-6) var(--sp-8);
  box-shadow: var(--shadow-2);
}

/* ============================================================
   8. CHIPS
   ============================================================ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid var(--outline);
  background: var(--surface);
  color: var(--on-surface);
  cursor: pointer;
  transition: all var(--duration-short);
  text-decoration: none;
  white-space: nowrap;
}
.chip:hover {
  background: var(--surface-variant);
  border-color: var(--primary);
  color: var(--primary);
}
.chip-badge {
  font-size: 0.6rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.chip-badge.hot { background: #FF4444; color: #fff; }
.chip-badge.trend { background: #FF9800; color: #fff; }
.chip-badge.new { background: #4CAF50; color: #fff; }

/* ============================================================
   9. BENTO GRID SYSTEM
   ============================================================ */
.bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
}

@media (min-width: 640px) {
  .bento-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .bento-grid { grid-template-columns: repeat(12, 1fr); }
  .bento-grid > *:nth-child(1) { grid-column: span 8; grid-row: span 2; }
  .bento-grid > *:nth-child(1) .post-thumb img { height: 100%; min-height: 320px; }
  .bento-grid > *:nth-child(2),
  .bento-grid > *:nth-child(3) { grid-column: span 4; }
  .bento-grid > *:nth-child(n+4) { grid-column: span 4; }
}

/* Simple grid variants */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: var(--sp-6); }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: var(--sp-6); }
.grid-4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-6); }

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ============================================================
   10. HERO SECTION
   ============================================================ */
.hero-section { position: relative; padding: var(--sp-8) 0; }

.mesh-bg {
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle at -10% -10%, rgba(var(--primary-rgb), 0.12) 0%, transparent 60%),
              radial-gradient(circle at 100% 100%, rgba(var(--secondary-rgb), 0.08) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, rgba(var(--primary-rgb), 0.05) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
  border-radius: var(--radius-xl);
  animation: meshMove 15s ease-in-out infinite alternate;
  filter: blur(40px);
}
[data-theme="dark"] .mesh-bg {
  background: radial-gradient(circle at 10% 20%, rgba(var(--primary-rgb), 0.04) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(var(--primary-rgb), 0.06) 0%, transparent 40%);
}

@keyframes meshMove {
  0% { transform: scale(1) translate(0, 0); }
  50% { transform: scale(1.03) translate(1%, 1%); }
  100% { transform: scale(1) translate(-1%, -1%); }
}

.hero-card {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-8);
  align-items: center;
  padding: var(--sp-8);
  position: relative;
  z-index: 1;
}
.hero-content { flex: 1 1 300px; }
.hero-content .hero-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--sp-4);
}
.hero-content .hero-title a { color: var(--on-surface); }
.hero-content .hero-title a:hover { color: var(--primary); }
.hero-content .hero-excerpt {
  color: var(--on-surface-variant);
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: var(--sp-6);
}
.hero-image {
  flex: 1 1 400px;
  text-align: center;
}
.hero-image a {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3);
}
.hero-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  max-height: 420px;
  transition: transform var(--duration-long) var(--ease-out);
}
.hero-image a:hover img { transform: scale(1.04); }

/* ============================================================
   11. SINGLE POST
   ============================================================ */
.single-article {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-1);
  border: 1px solid var(--outline);
  padding: var(--sp-8);
}
.single-article .entry-title {
  font-size: 2rem;
  line-height: 1.35;
  margin-bottom: var(--sp-4);
}
.single-article .entry-meta {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--outline);
  margin-bottom: var(--sp-6);
}
.single-article .post-thumbnail {
  margin-bottom: var(--sp-8);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.single-article .post-thumbnail img {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
}
.single-article .entry-content {
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--on-surface);
}
.single-article .entry-content h2 { font-size: 1.5rem; margin: var(--sp-8) 0 var(--sp-4); }
.single-article .entry-content h3 { font-size: 1.25rem; margin: var(--sp-6) 0 var(--sp-3); }
.single-article .entry-content p { margin-bottom: var(--sp-4); }
.single-article .entry-content ul,
.single-article .entry-content ol {
  padding-left: var(--sp-6);
  margin-bottom: var(--sp-4);
}
.single-article .entry-content li { margin-bottom: var(--sp-2); list-style: disc; }
.single-article .entry-content ol li { list-style: decimal; }
.single-article .entry-content img { border-radius: var(--radius-md); margin: var(--sp-4) 0; }
.single-article .entry-content blockquote {
  border-left: 4px solid var(--primary);
  padding: var(--sp-4) var(--sp-6);
  background: var(--surface-container);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: var(--sp-6) 0;
  font-style: italic;
  color: var(--on-surface-variant);
}

.single-article .entry-footer {
  margin-top: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--outline);
}
.single-article .tags-links a {
  display: inline-block;
  padding: var(--sp-1) var(--sp-3);
  background: var(--surface-container);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  margin: var(--sp-1);
  color: var(--on-surface-variant);
}
.single-article .tags-links a:hover {
  background: var(--primary-light);
  color: var(--primary);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  align-items: center;
  font-size: 0.88rem;
  color: var(--on-surface-variant);
  margin-bottom: var(--sp-6);
  padding: var(--sp-3) var(--sp-4);
  background: var(--surface-container);
  border-radius: var(--radius-sm);
}
.breadcrumbs a { color: var(--on-surface-variant); }
.breadcrumbs a:hover { color: var(--primary); }
.breadcrumbs .sep { color: var(--outline); margin: 0 var(--sp-1); }
.breadcrumbs .current { color: var(--on-surface); font-weight: 600; }

/* Share Buttons */
.share-buttons {
  display: flex;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--outline);
  background: var(--surface);
  color: var(--on-surface);
  cursor: pointer;
  transition: all var(--duration-short);
  text-decoration: none;
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); }
.share-btn svg { width: 16px; height: 16px; }

/* Related Posts */
.related-posts { margin-top: var(--sp-12); }
.related-posts .section-title { font-size: 1.4rem; }

/* ============================================================
   12. SIDEBAR
   ============================================================ */
.sidebar { position: sticky; top: 80px; }
.sidebar-widget {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  border: 1px solid var(--outline);
  padding: var(--sp-6);
  margin-bottom: var(--sp-6);
}
.sidebar-widget .widget-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 2px solid var(--primary);
  font-family: 'Outfit', sans-serif;
}

/* Latest Posts Widget */
.widget-post-item {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--outline-variant);
}
.widget-post-item:last-child { border-bottom: none; }
.widget-post-thumb {
  width: 70px;
  height: 50px;
  flex-shrink: 0;
  border-radius: var(--radius-xs);
  overflow: hidden;
}
.widget-post-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-xs);
}
.widget-post-info { flex: 1; min-width: 0; }
.widget-post-info .widget-post-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.widget-post-info .widget-post-title a { color: var(--on-surface); }
.widget-post-info .widget-post-title a:hover { color: var(--primary); }
.widget-post-info .widget-post-date {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  margin-top: var(--sp-1);
}

/* Tags Cloud Widget */
.tag-cloud { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.tag-cloud a {
  display: inline-block;
  padding: var(--sp-1) var(--sp-3);
  background: var(--surface-container);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--on-surface-variant);
  transition: all var(--duration-short);
}
.tag-cloud a:hover {
  background: var(--primary-light);
  color: var(--primary);
}

/* ============================================================
   13. FOOTER
   ============================================================ */
.site-footer {
  background: var(--surface-dim);
  border-top: 1px solid var(--outline);
  margin-top: var(--sp-16);
}
.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
  padding: var(--sp-12) 0 var(--sp-8);
}
@media (min-width: 768px) {
  .footer-content { grid-template-columns: 1.5fr 1fr 1fr; }
}

.footer-brand .footer-logo { margin-bottom: var(--sp-4); }
.footer-brand .footer-logo img { height: 42px; width: auto; border-radius: 0; }
.footer-brand .footer-desc {
  color: var(--on-surface-variant);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: var(--sp-4);
}
.footer-social { display: flex; gap: var(--sp-3); }
.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--surface-container);
  color: var(--on-surface-variant);
  transition: all var(--duration-short);
}
.footer-social a:hover {
  background: var(--primary);
  color: var(--on-primary);
}
.footer-social a svg { width: 18px; height: 18px; }

.footer-widget-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--sp-4);
  font-family: 'Outfit', sans-serif;
}
.footer-links { display: flex; flex-direction: column; gap: var(--sp-3); }
.footer-links a {
  color: var(--on-surface-variant);
  font-size: 0.92rem;
  transition: color var(--duration-short);
}
.footer-links a:hover { color: var(--primary); }
.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
  color: var(--on-surface-variant);
  font-size: 0.92rem;
  margin-bottom: var(--sp-3);
}
.footer-contact-item svg {
  width: 16px;
  height: 16px;
  margin-top: 3px;
  flex-shrink: 0;
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid var(--outline);
  padding: var(--sp-4) 0;
  text-align: center;
  color: var(--on-surface-variant);
  font-size: 0.85rem;
}

/* ============================================================
   14. PAGINATION
   ============================================================ */
.pagination-nav {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  margin-top: var(--sp-8);
}
.pagination-nav a,
.pagination-nav span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--duration-short);
}
.pagination-nav a {
  background: var(--surface);
  border: 1px solid var(--outline);
  color: var(--on-surface);
}
.pagination-nav a:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}
.pagination-nav .current {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
}

/* ============================================================
   15. ACCESSIBILITY
   ============================================================ */
.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute !important;
  width: 1px;
  word-wrap: normal !important;
}

/* Admin Bar offset */
.admin-bar .glass-header { top: 32px !important; }
@media screen and (max-width: 782px) {
  .admin-bar .glass-header { top: 46px !important; }
}

/* ============================================================
   16. SCROLL REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   17. SVG LINKS (Legacy shortcode support)
   ============================================================ */
.entry-content a:has(svg) {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  width: 140px;
  min-height: 140px;
  height: auto;
  padding: var(--sp-5) var(--sp-4) var(--sp-4);
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--on-surface);
  font-weight: bold;
  font-size: 1.1rem;
  line-height: 1.4;
  box-shadow: var(--shadow-1);
  transition: all var(--duration-short);
  text-align: center;
}
.entry-content a:has(svg):hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-2);
  border-color: var(--primary);
  color: var(--primary);
}
.entry-content a:has(svg) svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--sp-3);
  fill: currentColor;
  flex-shrink: 0;
}
.entry-content p:has(> a > svg) {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-6);
  justify-content: center;
  margin-top: var(--sp-8);
}

/* ============================================================
   18. RESPONSIVE
   ============================================================ */
@media (max-width: 1023px) {
  .nav-menu { display: none !important; }
  .menu-toggle { display: flex !important; }
  .mobile-nav { display: block; }
  .mobile-nav-overlay { display: block; }
  .header-cta { display: none; }

  .hero-title { font-size: 1.6rem !important; }
  .hero-card { padding: var(--sp-6) !important; }

  .single-article { padding: var(--sp-5); }
  .single-article .entry-title { font-size: 1.5rem; }
}

@media (max-width: 639px) {
  .container { padding: 0 var(--sp-4); }
  .section { padding: var(--sp-8) 0; }
  .section-title { font-size: 1.4rem; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-content .hero-excerpt { font-size: 1rem; }
  .footer-content { grid-template-columns: 1fr; }
}

/* ============================================================
   19. REVIEW BOX (Shortcode Legacy)
   ============================================================ */
.review-box {
  margin: var(--sp-8) 0;
  border-left: 4px solid var(--primary);
  background: var(--surface-variant);
}

/* ============================================================
   20. UTILITY CLASSES
   ============================================================ */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.font-bold { font-weight: 700; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.mt-4 { margin-top: var(--sp-4); }
.mt-8 { margin-top: var(--sp-8); }
/* ============================================================
   21. 600 CÂU HỎI LUYỆN THI
   ============================================================ */

/* Archive Grid */
.question-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}
@media (min-width: 768px) {
  .question-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .question-grid { grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
}

.question-card {
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
}
.question-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-3);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--on-surface-variant);
}
.question-badge {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--surface-container-high);
  color: var(--on-surface-variant);
}
.question-badge.danger {
  background: #FFEBEE;
  color: #D32F2F;
}
[data-theme="dark"] .question-badge.danger {
  background: rgba(211, 47, 47, 0.2);
  color: #FFCDD2;
}

.question-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--on-surface);
  margin-bottom: 0;
}
.question-card:hover .question-title { color: var(--primary); }

/* Single Page Layout */
.single-question-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
  margin-top: var(--sp-8);
}
@media (min-width: 1024px) {
  .single-question-layout { grid-template-columns: 2fr 1fr; }
}

/* Header */
.single-question-title {
  font-size: 1.5rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--sp-6);
  padding-bottom: var(--sp-4);
  border-bottom: 2px solid var(--surface-variant);
}
.single-question-image {
  margin-bottom: var(--sp-6);
  text-align: center;
}
.single-question-image img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}

/* Choices list (Left col) */
.question-choices { display: flex; flex-direction: column; gap: var(--sp-3); margin-bottom: var(--sp-6); }
.choice-item {
  padding: var(--sp-4) var(--sp-5);
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--outline);
  color: var(--on-surface);
  font-size: 1.05rem;
  line-height: 1.6;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  transition: all var(--duration-short);
}
.choice-item:hover {
  background: var(--surface-container);
  border-color: var(--outline-variant);
}
.choice-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-variant);
  color: var(--on-surface-variant);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
}

/* Result Box (Right col) */
.question-result-box {
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  border: 1px solid rgba(var(--primary-rgb), 0.2);
  height: fit-content;
}
[data-theme="dark"] .question-result-box {
  background: rgba(var(--primary-rgb), 0.1);
}
.result-header {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--sp-4);
  font-family: 'Outfit', sans-serif;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.result-content {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--sp-3);
  border-bottom: 1px dashed rgba(var(--primary-rgb), 0.3);
}
.result-row:last-child { border-bottom: none; padding-bottom: 0; }
.result-label { color: var(--on-surface-variant); font-size: 0.95rem; }
.result-value { font-weight: 700; font-size: 1.1rem; color: var(--on-surface); }
.result-value.is-danger { color: #D32F2F; }
[data-theme="dark"] .result-value.is-danger { color: #FFCDD2; }

/* Tip Box (Bottom) */
.question-tip-box {
  background: var(--surface-container);
  border: 2px dashed rgba(var(--primary-rgb), 0.5);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  margin-top: var(--sp-8);
  color: var(--on-surface);
  line-height: 1.7;
  font-size: 1.05rem;
  position: relative;
}
.question-tip-title {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--sp-2);
  background: var(--surface);
  padding: 0 var(--sp-2);
  position: absolute;
  top: -15px;
  left: 20px;
  border-radius: var(--radius-full);
  border: 2px dashed rgba(var(--primary-rgb), 0.5);
}

/* Navigation */
.question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--surface-variant);
}
.question-nav-link {
  display: inline-flex;
  flex-direction: column;
  color: var(--on-surface-variant);
  text-decoration: none;
  transition: all var(--duration-short);
}
.question-nav-link:hover { color: var(--primary); }
.question-nav-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.question-nav-title { font-weight: 600; font-size: 1rem; color: var(--on-surface); }
.question-nav-link:hover .question-nav-title { color: var(--primary); }
.nav-next { text-align: right; }
.nav-prev { text-align: left; }

/* ============================================================
   22. LUYỆN THI ONLINE PLUGIN (M3 OVERRIDES)
   ============================================================ */

/* Hide plugin's internal title (duplicate of page title) */
.ltg-quiz-container .ltg-info-panel h3 {
    display: none !important;
}

/* Hide duplicate user-entered titles embedded at the start of post contents */
.single-article .entry-content > h1:first-child,
.single-article .entry-content > h2:first-child,
.single-article .entry-content > .wp-block-heading:first-child {
    display: none !important;
}

/* Container & Layout */
.ltg-quiz-container {
    background-color: var(--surface-container-lowest) !important;
    border: none !important;
    padding: var(--sp-6) !important;
    border-radius: var(--radius-xl) !important;
    box-shadow: none !important;
    max-width: 100% !important;
}

.ltg-exam-layout-container {
    gap: var(--sp-8) !important;
}

/* Sidebar (Left) */
.ltg-exam-sidebar {
    background-color: var(--surface-container-low) !important;
    border-radius: var(--radius-lg) !important;
    padding: var(--sp-6) !important;
    box-shadow: var(--shadow-1) !important;
    border: 1px solid var(--outline-variant);
}

/* Main Content (Right) */
.ltg-exam-main-content {
    background-color: var(--surface) !important;
    border-radius: var(--radius-lg) !important;
    padding: var(--sp-6) !important;
    box-shadow: var(--shadow-1) !important;
    border: 1px solid var(--outline-variant);
}

/* Header row inside Sidebar */
#ltg-exam-header-top-row {
    border-color: var(--outline-variant) !important;
    margin-bottom: var(--sp-4) !important;
    padding-bottom: var(--sp-4) !important;
}

/* Timer */
.ltg-timer span {
    color: var(--primary) !important;
    font-size: 1.25rem;
    font-weight: 700;
}
.ltg-progress span {
    color: var(--on-surface-variant) !important;
}

/* Layout & Sidebar Info */
#ltg-exam-header-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--sp-4);
}
.ltg-auto-next-question-switch-container {
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
    white-space: nowrap !important;
}
.ltg-switch input:checked + .ltg-slider {
    background-color: var(--primary) !important;
}

/* Question Nav Buttons (The number grid) */
#ltg-question-navigation-panel {
    gap: 8px !important;
    border-top: none !important;
    padding-top: 0 !important;
    max-height: none !important; /* Fix buttons 21-25 cutoff */
    overflow-y: visible !important;
}

.ltg-nav-button {
    border-radius: var(--radius-md) !important;
    font-weight: 600 !important;
    background-color: var(--surface) !important;
    border: 1px solid var(--outline-variant) !important;
    color: var(--on-surface) !important;
    min-height: 40px !important;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem !important;
    transition: all var(--duration-short) !important;
}
.ltg-nav-button:hover {
    background-color: var(--surface-container-high) !important;
    border-color: var(--outline) !important;
}
.ltg-nav-button.answered {
    background-color: var(--primary-light) !important;
    border-color: rgba(var(--primary-rgb), 0.3) !important;
    color: var(--primary) !important;
}
.ltg-nav-button.current {
    background-color: var(--primary) !important;
    color: var(--on-primary) !important;
    border-color: var(--primary) !important;
    box-shadow: var(--shadow-1);
    transform: scale(1.05);
}

/* Question Text */
#ltg-current-question-display h4 {
    font-size: 1.35rem !important;
    font-weight: 600 !important;
    color: var(--on-surface) !important;
    line-height: 1.5 !important;
    margin-bottom: var(--sp-6) !important;
}

/* Image */
#ltg-question-image {
    border-radius: var(--radius-md) !important;
    border: none !important;
    box-shadow: var(--shadow-1) !important;
}

/* Answer Choices */
.ltg-choice-item {
    background-color: var(--surface) !important;
    border: 1px solid var(--outline) !important;
    border-radius: var(--radius-md) !important;
    padding: var(--sp-4) var(--sp-5) !important;
    margin-bottom: var(--sp-3) !important;
    transition: all var(--duration-short) !important;
}
.ltg-choice-item:hover {
    background-color: var(--surface-variant) !important;
    border-color: var(--outline-variant) !important;
}
/* If active/selected */
.ltg-choice-item:has(input:checked) {
    background-color: var(--primary-light) !important;
    border-color: var(--primary) !important;
}
.ltg-choice-item label {
    font-size: 1.05rem !important;
    color: var(--on-surface) !important;
    margin-left: 8px;
}

/* Custom Checkbox/Radio styling (Optional progressive enhancement) */
.ltg-choice-item input[type="radio"] {
    accent-color: var(--primary);
    width: 20px;
    height: 20px;
}

/* Buttons */
.ltg-button {
    border-radius: var(--radius-full) !important;
    text-transform: none !important;
    font-weight: 600 !important;
    padding: 12px 28px !important;
    box-shadow: none !important;
    border: 1px solid transparent !important;
    background-color: var(--primary) !important;
    color: var(--on-primary) !important;
}
.ltg-button:hover {
    background-color: var(--primary-dark) !important;
}
#ltg-prev-question-button, #ltg-next-question-button {
    background-color: var(--surface-variant) !important;
    color: var(--on-surface-variant) !important;
}
#ltg-prev-question-button:hover, #ltg-next-question-button:hover {
    background-color: var(--outline-variant) !important;
    color: var(--on-surface) !important;
}
#ltg-submit-exam-button-main {
    background-color: var(--primary) !important;
    color: var(--on-primary) !important;
    box-shadow: var(--shadow-2) !important;
}
#ltg-submit-exam-button-main:hover {
    background-color: var(--primary-dark) !important;
}

/* Controls Panel */
#ltg-exam-controls-panel {
    border-top: none !important;
    margin-top: var(--sp-8) !important;
    padding-top: 0 !important;
    display: flex;
    justify-content: center;
    gap: var(--sp-4);
}

/* Mobile Responsive */
@media (max-width: 767px) {
    .ltg-quiz-container { padding: 0 !important; }
    .ltg-exam-sidebar, .ltg-exam-main-content {
        border-radius: 0 !important;
        border: none !important;
        border-bottom: 1px solid var(--outline-variant) !important;
    }
    .ltg-nav-button { min-width: 44px !important; height: 44px !important; }
    #ltg-exam-controls-panel {
        flex-direction: column;
        gap: var(--sp-2);
    }
    #ltg-exam-controls-panel .ltg-button {
        width: 100%;
        margin: 0 !important;
    }
}

/* ============================================================
   24. PHASE 3 RESULT BOARD & CHART
   ============================================================ */
.ltg-chart-container {
    display: flex;
    justify-content: center;
    margin: var(--sp-6) 0;
}
.ltg-doughnut-chart {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: conic-gradient(#4CAF50 0deg, #F44336 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-2);
    position: relative;
    transition: background 1s var(--ease-bounce);
}
.ltg-doughnut-inner {
    width: 100px;
    height: 100px;
    background: var(--surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--on-surface);
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
}


/* ============================================================
   23. PHASE 2 GAMIFICATION & MICRO-ANIMATIONS
   ============================================================ */

/* Progress Bar Visual */
.ltg-progress-visual-wrapper {
    width: 100%;
    height: 10px;
    background: var(--surface-variant);
    border-radius: var(--radius-full);
    margin-top: var(--sp-2);
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}
.ltg-progress-visual-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary), var(--tertiary));
    width: 0%;
    transition: width 0.5s var(--ease-bounce);
    border-radius: var(--radius-full);
    position: relative;
    overflow: hidden;
}
.ltg-progress-visual-fill::after {
    content: '';
    position: absolute;
    top: 0; left: 0; bottom: 0; right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transform: translateX(-100%);
    animation: shimmer 2s infinite;
}

/* Timer Warning Colors */
.ltg-timer.warning span {
    color: #FF9800 !important;
    animation: pulse-orange 2s infinite;
}
.ltg-timer.danger span {
    color: #D32F2F !important;
    animation: pulse-red 1s infinite;
    font-weight: 800;
}

/* Choice Micro-animations */
.ltg-choice-item {
    position: relative;
    overflow: hidden;
}
.ltg-choice-item.is-correct-click {
    background-color: rgba(76, 175, 80, 0.1) !important;
    border-color: #4CAF50 !important;
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.3);
}
.ltg-choice-item.is-correct-click label::after {
    content: '✅';
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    animation: popIn 0.3s var(--ease-bounce);
}
.ltg-choice-item.is-wrong-click {
    background-color: rgba(211, 47, 47, 0.1) !important;
    border-color: #D32F2F !important;
    animation: shake 0.4s var(--ease-out);
}
.ltg-choice-item.is-wrong-click label::after {
    content: '❌';
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    animation: popIn 0.3s var(--ease-bounce);
}

/* Keyframes */
@keyframes shimmer {
    100% { transform: translateX(100%); }
}
@keyframes pulse-orange {
    0% { transform: scale(1); text-shadow: 0 0 0 rgba(255, 152, 0, 0.4); }
    50% { transform: scale(1.05); text-shadow: 0 0 10px rgba(255, 152, 0, 0.8); }
    100% { transform: scale(1); text-shadow: 0 0 0 rgba(255, 152, 0, 0.4); }
}
@keyframes pulse-red {
    0% { transform: scale(1); text-shadow: 0 0 0 rgba(211, 47, 47, 0.6); }
    50% { transform: scale(1.1); text-shadow: 0 0 15px rgba(211, 47, 47, 1); }
    100% { transform: scale(1); text-shadow: 0 0 0 rgba(211, 47, 47, 0.6); }
}
@keyframes shake {
    0% { transform: translateX(0); }
    20% { transform: translateX(-5px); }
    40% { transform: translateX(5px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(3px); }
    100% { transform: translateX(0); }
}
@keyframes popIn {
    0% { transform: translateY(-50%) scale(0); opacity: 0; }
    80% { transform: translateY(-50%) scale(1.2); opacity: 1; }
    100% { transform: translateY(-50%) scale(1); }
}

/* ============================================================
   15. TRAFFIC SIGNS ARCHIVE (BIỂN BÁO GIAO THÔNG)
   ============================================================ */

/* Bộ lọc (Filter Tabs) */
.ltg-bien-bao-page .sign-filter-tabs {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: var(--sp-3);
    padding: var(--sp-2) 0;
    margin-top: var(--sp-6);
    justify-content: center;
    -ms-overflow-style: none; /* IE and Edge */
    scrollbar-width: none;    /* Firefox */
}
.ltg-bien-bao-page .sign-filter-tabs::-webkit-scrollbar {
    display: none;
}
@media (max-width: 768px) {
    .ltg-bien-bao-page .sign-filter-tabs {
        justify-content: flex-start;
        padding: var(--sp-2) var(--sp-4);
        margin-left: calc(var(--sp-4) * -1);
        margin-right: calc(var(--sp-4) * -1);
    }
}
.sign-filter-btn {
    flex: 0 0 auto;
    background: var(--surface);
    border: 1px solid var(--outline);
    color: var(--on-surface-variant);
    padding: var(--sp-2) var(--sp-4);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-short) var(--ease-out);
}
.sign-filter-btn:hover {
    background: var(--surface-variant);
    color: var(--on-surface);
}
.sign-filter-btn.active {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

/* Biển báo Grid */
.sign-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-4);
}
@media (min-width: 576px) { .sign-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 768px) { .sign-grid { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 1024px) { .sign-grid { grid-template-columns: repeat(6, 1fr); } }

/* Sign Card */
.sign-card {
    background: var(--surface);
    border: 1px solid var(--surface-variant);
    border-radius: var(--radius-md);
    padding: var(--sp-3);
    text-align: center;
    position: relative;
    transition: transform var(--duration-short) var(--ease-out), box-shadow var(--duration-short);
    display: flex;
    flex-direction: column;
    align-items: center;
}
.sign-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2);
    border-color: rgba(var(--primary-rgb), 0.3);
}

.sign-thumbnail {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--surface-variant);
    border-radius: var(--radius-sm);
    margin-bottom: var(--sp-4);
    overflow: hidden;
}
.sign-thumbnail img {
    max-width: 85%;
    max-height: 85%;
    object-fit: contain;
}
.sign-placeholder {
    font-size: 2rem;
    color: var(--on-surface-variant);
    opacity: 0.5;
}

.sign-info { width: 100%; }
.sign-code {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 var(--sp-1);
}
.sign-name {
    font-size: 0.85rem;
    color: var(--on-surface);
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.sign-link-overlay {
    position: absolute;
    inset: 0;
    z-index: 10;
}

/* ============================================================
   16. STICKY SIDEBAR ARTICLE ACTIONS (TUOITRE STYLE)
   ============================================================ */

.article-sticky-wrapper {
    display: none; /* Ẩn trên Mobile/Tablet nhỏ */
}

@media (min-width: 1024px) {
    .article-sticky-wrapper {
        display: block;
        position: absolute;
        left: -64px; /* Đẩy ra ngoài lề trái của content */
        top: 0;
        bottom: 0;
        width: 48px;
        z-index: 50;
    }
    .article-sticky-actions {
        position: sticky;
        top: 140px; /* Cách mép trên màn hình */
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 12px;
        background: var(--surface);
        border: 1px solid var(--outline);
        border-radius: 40px;
        padding: 16px 8px;
        box-shadow: 0 4px 16px rgba(0,0,0,0.06);
    }
    .sticky-action-btn {
        background: transparent;
        border: 1px solid transparent;
        color: var(--on-surface-variant);
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        cursor: pointer;
        transition: all var(--duration-short) ease;
        padding: 0;
    }
    .sticky-action-btn:hover {
        background: var(--surface-variant);
        color: var(--primary);
    }
    .sticky-action-btn svg {
        width: 18px;
        height: 18px;
    }
    .sticky-action-label {
        font-size: 14px;
        font-weight: 700;
        color: var(--on-surface-variant);
        line-height: 1;
        user-select: none;
        padding: 4px 0;
    }
    
    .action-zoom-in, .action-zoom-out {
        font-size: 20px;
        font-weight: 400;
        border: 1px solid var(--outline);
    }
    
    .action-fb {
        color: #1877F2;
    }
    .action-fb:hover {
        background: rgba(24, 119, 242, 0.1);
        color: #1877F2;
    }
}

/* ============================================================
   17. BACK TO TOP BUTTON
   ============================================================ */
.back-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--duration-medium) var(--ease-bounce);
    z-index: 999;
}
.back-to-top-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top-btn:hover {
    background-color: var(--primary);
    box-shadow: 0 6px 16px rgba(var(--primary-rgb), 0.4);
    transform: translateY(-3px);
}
.back-to-top-btn svg {
    width: 24px;
    height: 24px;
}
@media (max-width: 768px) {
    .back-to-top-btn {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
    .back-to-top-btn svg {
        width: 20px;
        height: 20px;
    }
}