/* =============================================================
   HonziGo - Design System & Modern Stylesheet
   Matching hanzi-flip-learn-main aesthetic
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&family=Noto+Serif+SC:wght@500;600;700;900&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ---- CSS Variables & Design Tokens ---- */
:root {
  --radius: 0.9rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 0.9rem;
  --radius-xl: 1.15rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 1.75rem;

  /* Font Families */
  --font-sans: "Plus Jakarta Sans", "Noto Sans SC", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-hanzi: "Noto Serif SC", "Noto Sans SC", "KaiTi", "STKaiti", serif;

  /* Color Palette - Warm Ink Wash & Cinnabar Red */
  --background: #faf8f5;
  --foreground: #2d2424;
  --ink: #1f1c1d;

  --card: #ffffff;
  --card-foreground: #2d2424;

  --primary: #c23b2b;
  --primary-hover: #ab3122;
  --primary-foreground: #ffffff;

  --secondary: #f4efe9;
  --secondary-hover: #ebe3d9;
  --secondary-foreground: #463833;

  --muted: #f0ece6;
  --muted-foreground: #7a726e;

  --accent: #f4e8dc;
  --accent-foreground: #5e3b26;

  --border: #e8e2d8;
  --input: #e8e2d8;

  --destructive: #dc2626;
  --destructive-foreground: #ffffff;

  --success: #16a34a;
  --success-foreground: #ffffff;

  --warning: #d97706;
  --warning-foreground: #ffffff;

  --chart-1: #c23b2b;
  --chart-2: #e07a38;
  --chart-3: #16a34a;
  --chart-4: #2563eb;
  --chart-5: #64748b;

  /* Gradients & Shadows */
  --gradient-hero: radial-gradient(
      120% 90% at 85% 0%,
      rgba(194, 59, 43, 0.14),
      transparent 60%
    ),
    linear-gradient(180deg, rgba(244, 232, 220, 0.45), transparent 70%);

  --shadow-card: 0 1px 3px rgba(60, 30, 20, 0.05), 0 10px 25px -15px rgba(60, 30, 20, 0.2);
  --shadow-lift: 0 20px 40px -20px rgba(194, 59, 43, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s ease, opacity 0.15s ease;
}
a:hover {
  text-decoration: none;
  opacity: 0.9;
}

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

/* ---- Typography Utilities ---- */
.font-hanzi {
  font-family: var(--font-hanzi);
}

.text-ink { color: var(--ink) !important; }
.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--muted-foreground) !important; }
.text-muted { color: var(--muted-foreground) !important; }
.text-muted-foreground { color: var(--muted-foreground) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--destructive) !important; }
.text-warning { color: var(--warning) !important; }
.text-white { color: #ffffff !important; }

.fw-bold { font-weight: 700 !important; }
.fw-semibold { font-weight: 600 !important; }
.fw-extrabold { font-weight: 800 !important; }
.fw-medium { font-weight: 500 !important; }
.fw-normal { font-weight: 400 !important; }

.text-center { text-align: center !important; }
.text-start { text-align: left !important; }
.text-end { text-align: right !important; }

.tracking-tight { letter-spacing: -0.025em; }
.tracking-wider { letter-spacing: 0.05em; }
.tracking-widest { letter-spacing: 0.1em; }
.uppercase { text-transform: uppercase; }
.capitalize { text-transform: capitalize; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---- Layout & Container ---- */
.main-content {
  flex: 1;
}

.container {
  width: 100%;
  max-width: 1152px; /* max-w-6xl */
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }

/* ---- Backgrounds & Effects ---- */
.bg-hero {
  background-image: var(--gradient-hero);
}

.bg-card {
  background-color: var(--card) !important;
}

.bg-secondary {
  background-color: var(--secondary) !important;
}

.bg-muted {
  background-color: var(--muted) !important;
}

.bg-accent {
  background-color: var(--accent) !important;
}

.bg-primary {
  background-color: var(--primary) !important;
  color: var(--primary-foreground) !important;
}

.shadow-card {
  box-shadow: var(--shadow-card) !important;
}

.shadow-lift {
  box-shadow: var(--shadow-lift) !important;
}

.border-border {
  border: 1px solid var(--border) !important;
}

.rounded-xl { border-radius: var(--radius-xl) !important; }
.rounded-2xl { border-radius: var(--radius-2xl) !important; }
.rounded-3xl { border-radius: var(--radius-3xl) !important; }
.rounded-full { border-radius: 9999px !important; }

/* ---- Grid & Flexbox System ---- */
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-block { display: block; }
.d-none { display: none; }
.d-grid { display: grid; }

.flex-1 { flex: 1 1 0%; }
.flex-fill { flex: 1 1 auto; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.align-items-center { align-items: center; }
.align-items-start { align-items: flex-start; }
.align-items-end { align-items: flex-end; }
.align-self-center { align-self: center; }

.justify-content-start { justify-content: flex-start; }
.justify-content-center { justify-content: center; }
.justify-content-end { justify-content: flex-end; }
.justify-content-between { justify-content: space-between; }

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-5 { gap: 1.25rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.gap-10 { gap: 2.5rem; }

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

@media (min-width: 640px) {
  .sm-grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm-grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sm-flex-row { flex-direction: row; }
  .sm-block { display: block !important; }
}

/* Responsive visibility & breakpoints */
.mobile-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 768px) {
  .md-grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md-grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md-flex { display: flex !important; }
  .md-hidden { display: none !important; }
}

@media (min-width: 1024px) {
  .lg-grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg-grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .lg-flex { display: flex !important; }
  .lg-hidden { display: none !important; }

  /* Navbar desktop display at >= 1024px */
  .main-nav {
    display: flex !important;
  }
  .mobile-menu-btn,
  #mobileMenuToggle,
  #mobileMenuToggle.md-hidden {
    display: none !important;
  }
}

/* Ẩn navbar và hiện hamburger dưới 1024px để không bao giờ vỡ menu */
@media (max-width: 1023.98px) {
  .main-nav,
  .main-nav.md-flex {
    display: none !important;
  }
  .mobile-menu-btn,
  #mobileMenuToggle,
  #mobileMenuToggle.md-hidden {
    display: inline-flex !important;
  }
}

/* ---- Spacing ---- */
.m-0 { margin: 0 !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 0.75rem !important; }
.mb-4 { margin-bottom: 1rem !important; }
.mb-5 { margin-bottom: 1.25rem !important; }
.mb-6 { margin-bottom: 1.5rem !important; }
.mb-8 { margin-bottom: 2rem !important; }
.mb-10 { margin-bottom: 2.5rem !important; }
.mb-12 { margin-bottom: 3rem !important; }

.section-header-spaced {
  margin-bottom: 3rem !important;
}
@media (max-width: 768px) {
  .section-header-spaced {
    margin-bottom: 2rem !important;
  }
}

.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 0.75rem !important; }
.mt-4 { margin-top: 1rem !important; }
.mt-5 { margin-top: 1.25rem !important; }
.mt-6 { margin-top: 1.5rem !important; }
.mt-7 { margin-top: 1.75rem !important; }
.mt-8 { margin-top: 2rem !important; }
.mt-10 { margin-top: 2.5rem !important; }
.mt-auto { margin-top: auto !important; }

.ms-1 { margin-left: 0.25rem !important; }
.ms-2 { margin-left: 0.5rem !important; }
.me-1 { margin-right: 0.25rem !important; }
.me-2 { margin-right: 0.5rem !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }
.my-4 { margin-top: 1rem !important; margin-bottom: 1rem !important; }
.my-5 { margin-top: 1.25rem !important; margin-bottom: 1.25rem !important; }

.p-3 { padding: 0.75rem !important; }
.p-4 { padding: 1rem !important; }
.p-5 { padding: 1.25rem !important; }
.p-6 { padding: 1.5rem !important; }
.p-8 { padding: 2rem !important; }
.p-10 { padding: 2.5rem !important; }

.px-2 { padding-left: 0.5rem !important; padding-right: 0.5rem !important; }
.px-3 { padding-left: 0.75rem !important; padding-right: 0.75rem !important; }
.px-4 { padding-left: 1rem !important; padding-right: 1rem !important; }
.px-5 { padding-left: 1.25rem !important; padding-right: 1.25rem !important; }
.px-6 { padding-left: 1.5rem !important; padding-right: 1.5rem !important; }

.py-1 { padding-top: 0.25rem !important; padding-bottom: 0.25rem !important; }
.py-1-5 { padding-top: 0.375rem !important; padding-bottom: 0.375rem !important; }
.py-2 { padding-top: 0.5rem !important; padding-bottom: 0.5rem !important; }
.py-3 { padding-top: 0.75rem !important; padding-bottom: 0.75rem !important; }
.py-4 { padding-top: 1rem !important; padding-bottom: 1rem !important; }
.py-6 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; }
.py-8 { padding-top: 2rem !important; padding-bottom: 2rem !important; }
.py-10 { padding-top: 2.5rem !important; padding-bottom: 2.5rem !important; }
.py-12 { padding-top: 3rem !important; padding-bottom: 3rem !important; }
.py-14 { padding-top: 3.5rem !important; padding-bottom: 3.5rem !important; }
.py-16 { padding-top: 4rem !important; padding-bottom: 4rem !important; }
.py-20 { padding-top: 5rem !important; padding-bottom: 5rem !important; }

/* Responsive Section Padding: py-12 on desktop, py-8 on mobile */
.home-section {
  padding-top: 3rem;
  padding-bottom: 3rem;
}
@media (max-width: 767.98px) {
  .home-section {
    padding-top: 2rem !important;
    padding-bottom: 2rem !important;
  }
}

/* ---- Sticky Header & Navbar ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(232, 226, 216, 0.8);
  background-color: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header .header-inner {
  height: 4rem; /* h-16 */
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  text-decoration: none;
}
.brand-logo:hover {
  text-decoration: none;
  opacity: 1;
}

.brand-logo .logo-icon {
  display: flex;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xl);
  background-color: var(--primary);
  color: var(--primary-foreground);
  font-family: var(--font-hanzi);
  font-size: 1.15rem;
  box-shadow: var(--shadow-lift);
}

.brand-logo .logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--ink);
}

.main-nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1.5rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-link-item {
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  transition: background-color 0.15s, color 0.15s;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-link-item:hover {
  background-color: var(--secondary);
  color: var(--ink);
  text-decoration: none;
}
.nav-link-item.active {
  background-color: var(--secondary);
  color: var(--ink);
  font-weight: 600;
}

.mobile-menu-drawer {
  display: none;
  border-top: 1px solid var(--border);
  background-color: var(--background);
  padding: 0.75rem 1.25rem;
}
.mobile-menu-drawer.show {
  display: block;
}
.mobile-menu-drawer .nav-link-item {
  display: block;
  margin-bottom: 0.25rem;
  padding: 0.6rem 0.75rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25rem;
  padding: 0.5rem 1rem;
  transition: all 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  font-family: inherit;
}
.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  color: var(--primary-foreground);
}

.btn-outline {
  border-color: var(--border);
  background-color: var(--card);
  color: var(--foreground);
}
.btn-outline:hover {
  background-color: var(--secondary);
  color: var(--ink);
  border-color: var(--border);
}

.btn-outline-white {
  background-color: rgba(255, 255, 255, 0.15);
  color: #ffffff !important;
  border: 1.5px solid rgba(255, 255, 255, 0.75);
  font-weight: 600;
  backdrop-filter: blur(4px);
  transition: all 0.2s ease;
}
.btn-outline-white:hover {
  background-color: #ffffff !important;
  color: var(--primary) !important;
  border-color: #ffffff !important;
}

.btn-secondary {
  background-color: var(--secondary);
  color: var(--secondary-foreground);
  border-color: transparent;
}
.btn-secondary:hover {
  background-color: var(--secondary-hover);
  color: var(--ink);
}

.btn-ghost {
  background-color: transparent;
  color: var(--muted-foreground);
}
.btn-ghost:hover {
  background-color: var(--secondary);
  color: var(--ink);
}

.btn-danger-outline {
  border-color: var(--destructive);
  background-color: transparent;
  color: var(--destructive);
}
.btn-danger-outline:hover {
  background-color: rgba(220, 38, 38, 0.08);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border-radius: var(--radius-md);
}

.w-full { width: 100% !important; }

/* ---- Level Picker Component ---- */
.level-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.level-picker-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background-color: var(--card);
  color: var(--muted-foreground);
  text-decoration: none;
  transition: all 0.15s ease;
}
.level-picker-pill:hover {
  color: var(--ink);
  background-color: var(--secondary);
  text-decoration: none;
}
.level-picker-pill.active {
  background-color: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(194, 59, 43, 0.25);
}

/* ---- Cards & Tiles ---- */
.card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-2px);
}

.card-plain {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

/* ---- Progress Bars ---- */
.progress-container {
  width: 100%;
  height: 0.5rem; /* 8px */
  background-color: var(--secondary);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary);
  border-radius: 9999px;
  transition: width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.progress-bar-fill.success {
  background-color: var(--success);
}

/* ---- 3D Flip Card Styles ---- */
.card-3d {
  perspective: 1600px;
  width: 100%;
}

.card-flipper {
  position: relative;
  width: 100%;
  height: 20rem; /* h-80 */
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  cursor: pointer;
}

@media (min-width: 640px) {
  .card-flipper {
    height: 24rem; /* h-96 */
  }
}

.card-flipper.card-flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-3xl);
  border: 1px solid var(--border);
  background-color: var(--card);
  padding: 1.5rem;
  box-shadow: var(--shadow-lift);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-face-back {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  border-radius: var(--radius-3xl);
  border: 1px solid rgba(194, 59, 43, 0.3);
  background-color: var(--card);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-lift);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: rotateY(180deg);
}

.card-hanzi-text {
  font-family: var(--font-hanzi);
  font-size: 4.5rem;
  line-height: 1;
  color: var(--ink);
}

@media (min-width: 640px) {
  .card-hanzi-text {
    font-size: 5.5rem;
  }
}

/* ---- Badges & Pills ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  line-height: 1;
  text-transform: capitalize;
}

.badge-primary {
  background-color: rgba(194, 59, 43, 0.12);
  color: var(--primary);
  border: 1px solid rgba(194, 59, 43, 0.25);
}

.badge-secondary {
  background-color: var(--secondary);
  color: var(--secondary-foreground);
}

.badge-accent {
  background-color: var(--accent);
  color: var(--accent-foreground);
}

.badge-success {
  background-color: rgba(22, 163, 74, 0.12);
  color: var(--success);
  border: 1px solid rgba(22, 163, 74, 0.25);
}

.badge-warning {
  background-color: rgba(217, 119, 6, 0.12);
  color: var(--warning);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

/* ---- Form Inputs ---- */
.form-group {
  display: grid;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink);
}

.form-control,
.form-select {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--input);
  background-color: var(--card);
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  color: var(--foreground);
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(194, 59, 43, 0.15);
}

textarea.form-control {
  min-height: 5rem;
  resize: vertical;
}

.input-with-icon {
  position: relative;
}
.input-with-icon input {
  padding-left: 2.25rem;
}
.input-with-icon .icon-left {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted-foreground);
  pointer-events: none;
}

/* ---- Table Styles ---- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border);
  background-color: var(--card);
  box-shadow: var(--shadow-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.data-table th {
  background-color: var(--secondary);
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--secondary-foreground);
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover {
  background-color: rgba(244, 239, 233, 0.5);
}

/* ---- List Group (Word List Item) ---- */
.word-list-group {
  list-style: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  background-color: var(--card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.word-list-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  transition: background-color 0.15s;
}
.word-list-item:last-child {
  border-bottom: none;
}
.word-list-item:hover {
  background-color: rgba(244, 239, 233, 0.5);
}

/* ---- Quiz Option Buttons ---- */
.quiz-option-btn {
  display: block;
  width: 100%;
  text-align: left;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background-color: var(--card);
  padding: 0.85rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--foreground);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}
.quiz-option-btn:hover {
  background-color: var(--secondary);
  border-color: var(--border);
}

.quiz-option-btn.selected {
  border-color: var(--primary);
  background-color: rgba(194, 59, 43, 0.08);
  font-weight: 600;
}

.quiz-option-btn.right {
  border-color: var(--success);
  background-color: rgba(22, 163, 74, 0.1);
  color: var(--success);
}

.quiz-option-btn.wrong {
  border-color: var(--destructive);
  background-color: rgba(220, 38, 38, 0.1);
  color: var(--destructive);
}

/* ---- Alerts ---- */
.alert-box {
  border-radius: var(--radius-xl);
  padding: 0.85rem 1.25rem;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.alert-box.alert-success {
  background-color: rgba(22, 163, 74, 0.1);
  border: 1px solid rgba(22, 163, 74, 0.25);
  color: #15803d;
}

.alert-box.alert-error {
  background-color: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.25);
  color: #b91c1c;
}

.alert-box.alert-info {
  background-color: var(--secondary);
  border: 1px solid var(--border);
  color: var(--muted-foreground);
}

/* ---- Pagination ---- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  list-style: none;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
}

.page-item .page-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  height: 2.25rem;
  padding: 0 0.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: var(--card);
  color: var(--foreground);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}
.page-item .page-link:hover {
  background-color: var(--secondary);
}
.page-item.active .page-link {
  background-color: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}
.page-item.disabled .page-link {
  opacity: 0.5;
  pointer-events: none;
}

/* ---- Tabs (Nav Tabs) ---- */
.tab-header {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted-foreground);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}
.tab-btn:hover {
  color: var(--ink);
}
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content-panel {
  display: none;
}
.tab-content-panel.active {
  display: block;
}

/* ---- Modal Architecture (Modern & Mobile-First) ---- */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(31, 28, 29, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 10000;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem;
  box-sizing: border-box;
}
.modal-backdrop.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-dialog {
  background-color: var(--card);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border);
  box-shadow: 0 25px 60px -15px rgba(31, 28, 29, 0.35);
  max-width: 580px;
  width: 100%;
  max-height: calc(100dvh - 2rem);
  max-height: calc(100vh - 2rem);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  margin: auto;
  position: relative;
  animation: modalScaleIn 0.2s cubic-bezier(0.22, 1, 0.36, 1);
  box-sizing: border-box;
}

.modal-dialog.p-0 {
  padding: 0 !important;
}

.modal-header-fixed {
  flex-shrink: 0;
  background: #faf8f5;
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 1.75rem 1.15rem 1.75rem;
  position: relative;
}

.modal-body-scrollable {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 1.25rem 1.75rem;
}

.modal-body-scrollable::-webkit-scrollbar {
  width: 5px;
}
.modal-body-scrollable::-webkit-scrollbar-track {
  background: transparent;
}
.modal-body-scrollable::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
}
.modal-body-scrollable::-webkit-scrollbar-thumb:hover {
  background: var(--muted-foreground);
}

.modal-footer-fixed {
  flex-shrink: 0;
  background: #faf8f5;
  border-top: 1px solid var(--border);
  padding: 1rem 1.75rem;
}

.modal-close-btn {
  width: 32px;
  height: 32px;
  min-width: 32px;
  min-height: 32px;
  border-radius: 50%;
  background: var(--secondary);
  border: 1px solid var(--border);
  color: var(--muted-foreground);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
  flex-shrink: 0;
  font-size: 0.95rem;
}
.modal-close-btn:hover {
  background: var(--border);
  color: var(--ink);
  transform: rotate(90deg);
}

@keyframes modalScaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* Mobile Responsiveness for Modal (< 640px) */
@media (max-width: 640px) {
  .modal-backdrop {
    padding: 0.5rem;
  }
  .modal-dialog {
    max-width: 100% !important;
    width: 100% !important;
    max-height: calc(100dvh - 1rem);
    max-height: calc(100vh - 1rem);
    border-radius: var(--radius-xl);
  }
  .modal-header-fixed {
    padding: 1rem 1.25rem !important;
  }
  .modal-header-fixed h2,
  .modal-header-fixed h3,
  .modal-header-fixed .modal-title {
    font-size: 1.25rem !important;
    line-height: 1.35 !important;
  }
  .modal-header-fixed p {
    font-size: 0.825rem !important;
    line-height: 1.45 !important;
  }
  .modal-body-scrollable {
    padding: 1rem 1.25rem !important;
  }
  .modal-footer-fixed {
    padding: 0.875rem 1.25rem !important;
  }
}

/* ---- Audio Wave / Speaker button ---- */
.btn-speaker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--muted-foreground);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background-color 0.15s;
}
.btn-speaker:hover {
  color: var(--primary);
  background-color: var(--secondary);
}

/* ---- Site Footer ---- */
.site-footer {
  border-top: 1px solid rgba(232, 226, 216, 0.7);
  padding: 2rem 1.25rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

/* ---- Homepage Specific Components ---- */
.leitner-box-row {
  background: #faf8f5;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0.65rem 0.85rem;
  transition: background-color 0.15s ease;
}
.leitner-box-row:hover {
  background: #f4efe9;
}
.leitner-badge {
  min-width: 58px;
  text-align: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}
.leitner-tag {
  font-size: 0.775rem;
  padding: 0.35rem 0.65rem;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 105px;
  text-align: center;
  justify-content: center;
  font-weight: 600;
}
@media (max-width: 576px) {
  .leitner-box-row {
    padding: 0.5rem 0.6rem !important;
    gap: 0.4rem !important;
  }
  .leitner-badge {
    min-width: 50px !important;
    font-size: 0.725rem !important;
    padding: 0.25rem 0.35rem !important;
  }
  .leitner-tag {
    min-width: 88px !important;
    font-size: 0.725rem !important;
    padding: 0.25rem 0.45rem !important;
  }
  .leitner-title {
    font-size: 0.825rem !important;
  }
  .leitner-desc {
    font-size: 0.7rem !important;
  }
}

.comp-icon-col {
  width: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.cta-banner {
  padding: 2.25rem 1.5rem;
}
@media (min-width: 640px) {
  .cta-banner {
    padding: 3rem 2.5rem;
  }
}