/* =========================================================
   MAIN CSS — Mobile-First Fully Responsive
   โรงเรียนวัดปัญจทายิกาวาส | คลังสื่อการเรียนรู้
   =========================================================
   Breakpoints:
     sm:  480px   (large phone landscape)
     md:  768px   (tablet portrait)
     lg: 1024px   (laptop/desktop)
     xl: 1280px   (large desktop)
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700;800&display=swap');

/* ---- Design Tokens ---- */
:root {
  --font-th: 'Prompt', sans-serif;

  /* School Red */
  --red-900: #7B0013;  --red-800: #9B0018;
  --red-700: #C0152A;  --red-600: #D91F33;
  --red-500: #E8293E;  --red-400: #F05060;
  --red-100: rgba(192,21,42,0.08);

  /* Grade colors */
  --c1:#FF6FA3; --c2:#FF9A3C; --c3:#FFB800;
  --c4:#34C759; --c5:#34AADC; --c6:#AF52DE;

  /* Neutrals */
  --white:    #FFFFFF;
  --gray-50:  #FAFAFA; --gray-100: #F4F4F5;
  --gray-200: #E4E4E7; --gray-300: #D1D1D6;
  --gray-500: #71717A; --gray-700: #3F3F46;
  --gray-900: #18181B;

  /* Surfaces */
  --surface-0: #FFFFFF;
  --surface-1: #F8F9FA;
  --surface-2: #FFFFFF;
  --border:    rgba(0,0,0,0.06);
  --border-md: rgba(0,0,0,0.10);

  /* Text */
  --text-1: #18181B; --text-2: #3F3F46;
  --text-3: #71717A; --text-4: #A1A1AA;

  /* Shadows */
  --shadow-xs: 0 2px 4px rgba(0,0,0,0.02);
  --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
  --shadow-lg: 0 16px 40px rgba(0,0,0,0.08);
  --shadow-red-sm: 0 4px 16px rgba(192,21,42,0.15);
  --shadow-red-md: 0 8px 28px rgba(192,21,42,0.20);

  /* Radius */
  --r-xs:6px; --r-sm:12px; --r-md:18px;
  --r-lg:24px; --r-xl:32px; --r-full:9999px;

  /* Transitions */
  --ease: cubic-bezier(0.4,0,0.2,1);
  --ease-bounce: cubic-bezier(0.34,1.56,0.64,1);
  --t-fast:0.15s var(--ease); --t-base:0.25s var(--ease);
  --t-slow:0.4s  var(--ease); --t-bounce:0.45s var(--ease-bounce);

  /* Banner vars (overridden by settings) */
  --banner-bg-1: #8B0D1E;
  --banner-bg-2: #C0152A;
  --banner-bg-3: #E03050;

  /* Touch target minimum (WCAG) */
  --touch-min: 48px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%; /* prevent iOS font scale */
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-th);
  background: var(--surface-1);
  color: var(--text-1);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Dot grid texture */
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image: radial-gradient(circle, rgba(192,21,42,0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none; z-index: 0;
}

/* ============================================================
   SCHOOL BANNER
   ============================================================ */
.school-banner {
  position: relative;
  background: linear-gradient(135deg,
    var(--banner-bg-1) 0%,
    var(--banner-bg-2) 55%,
    var(--banner-bg-3) 100%);
  overflow: hidden; z-index: 1;
}
.school-banner::before {
  content: '';
  position: absolute; top: -40%; right: -8%;
  width: 420px; height: 420px; border-radius: 50%;
  background: rgba(255,255,255,0.05);
  pointer-events: none;
}
.school-banner .stripe {
  position: absolute; top: 0; right: 15%; bottom: 0; width: 3px;
  background: rgba(255,255,255,0.08);
  transform: skewX(-20deg);
}

/* Banner inner — Mobile first: stack vertically */
.banner-inner {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.8rem;
  padding: 1.2rem 1rem;
}

/* Logo */
.banner-logo {
  flex-shrink: 0;
  width: 70px; height: 70px;
  background: rgba(255,255,255,0.12);
  border: 2px solid rgba(255,255,255,0.25);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  padding: 7px;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.2);
  transition: var(--t-bounce);
  animation: logoPing 3s ease-out infinite;
}
.banner-logo:hover { transform: scale(1.06); }
.banner-logo img { width: 100%; height: 100%; object-fit: contain; border-radius: 50%; }

.banner-text { color: #FFFFFF; }
.banner-school-th {
  font-size: 1.1rem; font-weight: 700;
  line-height: 1.3;
  text-shadow: 0 2px 12px rgba(0,0,0,0.25);
}
.banner-school-en {
  font-size: 0.75rem; font-weight: 400;
  color: rgba(255,255,255,0.8);
  margin-top: 0.1rem; letter-spacing: 0.05em;
}
.banner-motto {
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-top: 0.5rem;
  font-size: 0.75rem; font-weight: 500;
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--r-full);
  padding: 0.22rem 0.8rem;
  backdrop-filter: blur(8px);
}

/* Tagline — hidden on mobile */
.banner-tagline { display: none; }

/* Tablet+ banner layout */
@media (min-width: 768px) {
  .banner-inner {
    flex-direction: row;
    text-align: left;
    padding: 1.6rem 2rem;
    gap: 1.5rem;
  }
  .banner-logo { width: 80px; height: 80px; }
  .banner-school-th { font-size: 1.45rem; }
  .banner-school-en { font-size: 0.82rem; }
  .banner-motto      { font-size: 0.8rem; }
  .banner-tagline {
    display: block;
    text-align: right;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.7;
    border-left: 1px solid rgba(255,255,255,0.2);
    padding-left: 1.2rem;
    margin-left: auto;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .banner-inner   { padding: 1.8rem 2.5rem; }
  .banner-logo    { width: 88px; height: 88px; }
  .banner-school-th { font-size: 1.65rem; }
}

@keyframes logoPing {
  0%  { box-shadow: 0 0 0 0 rgba(255,255,255,0.25); }
  70% { box-shadow: 0 0 0 16px rgba(255,255,255,0); }
  100%{ box-shadow: 0 0 0 0 rgba(255,255,255,0); }
}

/* ============================================================
   NAVBAR — Glass sticky
   ============================================================ */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1rem;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 20px rgba(192,21,42,0.06);
  transition: background var(--t-base), box-shadow var(--t-base);
}
.navbar.scrolled {
  background: rgba(255,255,255,0.97);
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

.navbar-brand {
  display: flex; align-items: center; gap: 0.55rem;
  text-decoration: none; flex-shrink: 0;
}
.navbar-brand .brand-logo {
  width: 32px; height: 32px; border-radius: 50%;
  border: 2px solid var(--border-md);
  object-fit: contain; padding: 2px; background: white;
}
.navbar-brand .brand-name {
  font-size: 1rem; font-weight: 700;
  background: linear-gradient(135deg, var(--red-700), var(--red-500));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

/* Desktop nav links */
.navbar-links {
  list-style: none;
  display: none; /* hidden on mobile */
  align-items: center; gap: 0.2rem;
}
.navbar-links a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.875rem; font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: var(--r-full);
  border: 1.5px solid transparent;
  transition: var(--t-fast);
  white-space: nowrap;
}
.navbar-links a:hover, .navbar-links a.active-link {
  color: var(--red-700);
  background: var(--red-100);
  border-color: rgba(192,21,42,0.15);
}

/* Hamburger button — visible on mobile */
.hamburger {
  display: flex; flex-direction: column;
  justify-content: center; align-items: center;
  gap: 5px;
  width: 44px; height: 44px;
  border: none; background: transparent;
  cursor: pointer; padding: 8px;
  border-radius: var(--r-sm);
  transition: var(--t-fast);
}
.hamburger:hover { background: var(--red-100); }
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text-2);
  border-radius: 2px;
  transition: var(--t-base);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile dropdown nav */
.mobile-nav {
  display: none;
  flex-direction: column;
  position: fixed; top: 56px; left: 0; right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
  padding: 0.8rem 1rem;
  gap: 0.3rem;
  z-index: 990;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 1rem; font-weight: 600;
  padding: 0.75rem 1rem;
  border-radius: var(--r-sm);
  border: 1.5px solid transparent;
  transition: var(--t-fast);
  min-height: var(--touch-min); /* touch target */
  display: flex; align-items: center;
}
.mobile-nav a:hover, .mobile-nav a.active-link {
  background: var(--red-100);
  color: var(--red-700);
  border-color: rgba(192,21,42,0.15);
}

/* Show desktop nav, hide hamburger on tablet+ */
@media (min-width: 768px) {
  .navbar         { padding: 0 1.5rem; height: 60px; }
  .navbar-links   { display: flex; }
  .hamburger      { display: none; }
  .mobile-nav     { display: none !important; }
}
@media (min-width: 1024px) {
  .navbar { padding: 0 2.5rem; }
}

/* ============================================================
   CONTAINER
   ============================================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;     /* 16px on mobile */
  position: relative;
  z-index: 1;
}
@media (min-width: 768px)  { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2.5rem; } }

.page-content { padding-top: 1.5rem; padding-bottom: 4rem; }
@media (min-width: 768px) { .page-content { padding-top: 2rem; padding-bottom: 5rem; } }

.page-transition { animation: fadeUp 0.5s var(--ease) both; }

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  padding: 2rem 0 1.5rem;
  text-align: center;
  position: relative;
}
.hero-orb { position: absolute; pointer-events: none; border-radius: 50%; filter: blur(60px); }
.hero-orb-1 { top:-60px; left:5%;  width:200px;height:200px; background:rgba(192,21,42,0.07); }
.hero-orb-2 { top:0;  right:8%;    width:160px;height:160px; background:rgba(255,111,163,0.06); }
.hero-orb-3 { bottom:-40px;left:30%;width:260px;height:160px;background:rgba(255,184,0,0.04); }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: white;
  border: 1.5px solid var(--border-md);
  border-radius: var(--r-full);
  font-size: 0.78rem; font-weight: 600; color: var(--red-700);
  margin-bottom: 1.2rem;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: clamp(1.7rem, 5vw, 3.4rem);
  font-weight: 800; line-height: 1.2;
  color: var(--text-1);
  letter-spacing: -0.02em;
  margin-bottom: 0.9rem;
}
.hero-title .gradient-word {
  background: linear-gradient(135deg, var(--red-700), #E8293E, #FF6FA3, #FF9A3C);
  background-size: 200%;
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradShift 4s ease infinite;
}

.hero-sub {
  font-size: 0.95rem; color: var(--text-3);
  max-width: 520px; margin: 0 auto 1.5rem;
  line-height: 1.75;
}

.search-wrap {
  position: relative; max-width: 440px; margin: 0 auto 1.5rem;
}
.search-input {
  width: 100%;
  padding: 0.85rem 1.1rem 0.85rem 2.8rem;
  border: 2px solid var(--border-md);
  border-radius: var(--r-full);
  font-family: var(--font-th); font-size: 0.95rem;
  color: var(--text-1); background: white;
  outline: none;
  box-shadow: var(--shadow-sm);
  transition: var(--t-base);
  min-height: var(--touch-min); /* touch friendly */
}
.search-input:focus {
  border-color: var(--red-600);
  box-shadow: 0 0 0 3px rgba(192,21,42,0.1), var(--shadow-sm);
}
.search-icon {
  position: absolute; left: 0.9rem; top: 50%;
  transform: translateY(-50%);
  font-size: 1rem; pointer-events: none;
}

/* Hero stats */
.hero-stats {
  display: flex; justify-content: center;
  gap: 0.8rem; flex-wrap: wrap;
}
.hero-stat {
  display: flex; flex-direction: column; align-items: center;
  background: white; border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  padding: 0.75rem 1.2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--t-bounce);
  min-width: 85px;
}
.hero-stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.hero-stat-num   { font-size: 1.6rem; font-weight: 800; color: var(--red-700); line-height: 1; }
.hero-stat-label { font-size: 0.68rem; font-weight: 500; color: var(--text-3); margin-top: 0.25rem; }

@keyframes gradShift  { 0%,100%{background-position:0% 50%} 50%{background-position:100% 50%} }
@keyframes fadeUp     { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-eyebrow {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.72rem; font-weight: 700;
  color: var(--red-700); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.section-title { font-size: clamp(1.2rem, 3vw, 1.7rem); font-weight: 800; color: var(--text-1); letter-spacing: -0.02em; }
.section-sub   { font-size: 0.88rem; color: var(--text-3); margin-top: 0.3rem; }

/* ============================================================
   GRADE CARDS GRID — Mobile First
   ============================================================ */
.grades-grid {
  display: grid;
  grid-template-columns: 1fr;                     /* Mobile: 1 col */
  gap: 1rem;
}
@media (min-width: 480px)  { .grades-grid { grid-template-columns: repeat(2, 1fr); } }   /* 2 col */
@media (min-width: 1024px) { .grades-grid { grid-template-columns: repeat(3, 1fr); gap:1.3rem; } } /* 3 col */
@media (min-width: 1280px) { .grades-grid { grid-template-columns: repeat(3, 1fr); gap:1.5rem; } }

.grade-card {
  position: relative;
  display: block;
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
  text-decoration: none; color: var(--text-1);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-bounce), box-shadow var(--t-slow), border-color var(--t-base);
}
.grade-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--card-gradient);
  z-index: 1;
}

/* Disable hover transforms on mobile (touch devices) */
@media (hover: hover) {
  .grade-card:hover {
    transform: translateY(-8px) scale(1.008);
    box-shadow: var(--shadow-lg), 0 0 0 2px var(--card-color, var(--red-700));
    border-color: var(--card-color, var(--red-700));
  }
  .grade-card:hover .grade-icon-wrap { transform: scale(1.08) rotate(-4deg); }
  .grade-card:hover .grade-arrow-btn { transform: translateX(5px) scale(1.1); }
  .grade-card:hover .grade-card-glow { opacity: 0.1; transform: scale(1.5); }
}

/* Active state for touch */
.grade-card:active {
  transform: scale(0.97);
  box-shadow: var(--shadow-xs);
}

.grade-card-strip {
  position: absolute; top: 0; left: 0; bottom: 0; width: 5px;
  background: var(--card-gradient); opacity: 0;
  transition: opacity var(--t-base);
}
.grade-card-glow {
  position: absolute; top: -60px; right: -60px;
  width: 200px; height: 200px; border-radius: 50%;
  background: var(--card-gradient);
  opacity: 0.04;
  transition: opacity var(--t-base), transform var(--t-slow);
}

.grade-card-inner { position: relative; z-index: 2; padding: 1.2rem; }
@media (min-width: 768px) { .grade-card-inner { padding: 1.5rem; } }

.grade-card-top {
  display: flex; align-items: flex-start; gap: 0.9rem;
  margin-bottom: 1rem;
}
.grade-icon-wrap {
  width: 56px; height: 56px; flex-shrink: 0;
  border-radius: var(--r-md);
  background: var(--card-gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.7rem;
  box-shadow: 0 6px 18px rgba(0,0,0,0.12);
  transition: var(--t-bounce);
}
@media (min-width: 768px) {
  .grade-icon-wrap { width: 64px; height: 64px; font-size: 2rem; }
}

.grade-meta    { flex: 1; }
.grade-label   { font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-4); margin-bottom: 0.15rem; }
.grade-name    { font-size: 0.95rem; font-weight: 800; color: var(--text-1); margin-bottom: 0.35rem; line-height: 1.3; }
@media (min-width: 768px) { .grade-name { font-size: 1.05rem; } }
.grade-chip {
  display: inline-block;
  padding: 0.12rem 0.6rem;
  border-radius: var(--r-full);
  font-size: 0.68rem; font-weight: 700; color: white;
  background: var(--card-gradient);
}

.grade-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
}
.grade-media-types { display: flex; gap: 0.3rem; flex-wrap: wrap; }
.grade-type-chip {
  font-size: 0.62rem; font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--r-full);
  background: var(--gray-100); color: var(--text-3);
}
.grade-count-chip {
  display: flex; align-items: center; gap: 0.35rem;
  font-size: 0.78rem; font-weight: 700; color: var(--text-2);
  padding: 0.25rem 0.7rem;
  background: var(--gray-100);
  border-radius: var(--r-full);
  margin-bottom: 0.35rem;
}
.grade-arrow-btn {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--card-gradient);
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 0.95rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transition: var(--t-bounce); flex-shrink: 0;
}

/* ============================================================
   LESSON CARDS GRID — Mobile First
   ============================================================ */
.lesson-grid {
  display: grid;
  grid-template-columns: 1fr;                          /* Mobile: 1 col */
  gap: 0.9rem;
}
@media (min-width: 480px)  { .lesson-grid { grid-template-columns: repeat(2, 1fr); gap:1rem; } }
@media (min-width: 768px)  { .lesson-grid { grid-template-columns: repeat(2, 1fr); gap:1.1rem; } }
@media (min-width: 1024px) { .lesson-grid { grid-template-columns: repeat(3, 1fr); gap:1.2rem; } }
@media (min-width: 1280px) { .lesson-grid { grid-template-columns: repeat(4, 1fr); gap:1.3rem; } }

.lesson-card {
  display: flex; flex-direction: column;
  background: white; border: 1.5px solid var(--border);
  border-radius: var(--r-xl); overflow: hidden;
  text-decoration: none; color: var(--text-1);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-bounce), box-shadow var(--t-slow), border-color var(--t-base);
}
@media (hover: hover) {
  .lesson-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--card-color, var(--red-700));
  }
  .lesson-card:hover .lesson-thumb-icon { transform: scale(1.12); }
}
.lesson-card:active { transform: scale(0.97); }

.lesson-thumb {
  height: 120px; position: relative; overflow: hidden;
  background: var(--card-gradient, linear-gradient(135deg,var(--red-700),var(--red-500)));
  display: flex; align-items: center; justify-content: center;
}
@media (min-width: 768px) { .lesson-thumb { height: 140px; } }

.lesson-thumb-icon {
  font-size: 3.2rem;
  filter: drop-shadow(0 4px 10px rgba(0,0,0,0.2));
  transition: var(--t-bounce); position: relative; z-index: 1;
}
@media (min-width: 768px) { .lesson-thumb-icon { font-size: 4rem; } }

.lesson-thumb-shine {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12), rgba(255,255,255,0));
}
.lesson-type-pill {
  position: absolute; bottom: 8px; left: 8px;
  padding: 0.2rem 0.6rem;
  border-radius: var(--r-full); font-size: 0.65rem; font-weight: 700;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.9); color: var(--text-2);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  z-index: 2;
}

.lesson-body {
  padding: 0.9rem; flex: 1; display: flex; flex-direction: column;
}
@media (min-width: 768px) { .lesson-body { padding: 1rem 1.1rem; } }

.lesson-num {
  font-size: 0.65rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--card-color, var(--red-700)); margin-bottom: 0.3rem;
}
.lesson-title {
  font-size: 0.88rem; font-weight: 700; line-height: 1.45;
  color: var(--text-1); flex: 1;
}
@media (min-width: 768px) { .lesson-title { font-size: 0.92rem; } }

.lesson-meta { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: 0.65rem; }
.lesson-badge {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 0.14rem 0.5rem;
  border-radius: var(--r-full); font-size: 0.65rem; font-weight: 700;
}
.badge-video { background:rgba(255,111,163,0.1);color:#C0336B; }
.badge-game  { background:rgba(175,82,222,0.1); color:#7B2FAA; }
.badge-pdf   { background:rgba(255,184,0,0.12); color:#8B5500; }
.badge-image { background:rgba(52,170,220,0.1); color:#0A6A9F; }
.badge-other { background:rgba(76,215,100,0.1); color:#1A7A30; }
.badge-draft { background:var(--gray-100);       color:var(--text-4); }

/* ============================================================
   BUTTONS — Touch-friendly minimum sizes
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--r-full);
  font-family: var(--font-th); font-size: 0.9rem; font-weight: 700;
  text-decoration: none; cursor: pointer; border: none;
  transition: var(--t-bounce); white-space: nowrap;
  min-height: var(--touch-min);    /* ✅ Touch target */
  min-width: var(--touch-min);
  -webkit-tap-highlight-color: transparent;
}
.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
  min-height: 40px; min-width: 40px;
}
@media (max-width: 480px) {
  /* Full-width buttons on very small screens */
  .btn-mobile-full { width: 100%; justify-content: center; }
}

.btn-primary {
  background: linear-gradient(135deg, var(--red-700), var(--red-500));
  color: white; box-shadow: var(--shadow-red-sm);
}
@media (hover: hover) { .btn-primary:hover { transform: translateY(-3px); box-shadow: var(--shadow-red-md); } }
.btn-primary:active  { transform: scale(0.96); }

.btn-ghost {
  background: white; color: var(--text-2);
  border: 1.5px solid var(--border-md);
  box-shadow: var(--shadow-xs);
}
@media (hover: hover) { .btn-ghost:hover { background: var(--surface-2); color: var(--red-700); border-color: rgba(192,21,42,0.3); } }
.btn-ghost:active { transform: scale(0.96); }

/* ============================================================
   LESSON DETAIL PAGE
   ============================================================ */
/* Mobile: single column stack */
.lesson-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
/* Desktop: content + sidebar */
@media (min-width: 900px) {
  .lesson-layout { grid-template-columns: 1fr 220px; gap: 2rem; }
}

.lesson-header {
  background: white; border: 1.5px solid var(--border);
  border-radius: var(--r-xl); padding: 1.4rem;
  margin-bottom: 1.2rem; box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
@media (min-width: 768px) { .lesson-header { padding: 2rem 2.2rem; margin-bottom: 1.5rem; } }

.lesson-header::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--card-gradient, linear-gradient(135deg,var(--red-700),var(--red-500)));
}
.lesson-header h1 {
  font-size: clamp(1.2rem, 3.5vw, 1.7rem);
  font-weight: 800; letter-spacing: -0.02em; margin-bottom: 0.5rem;
}

.lesson-breadcrumb {
  display: flex; align-items: center; gap: 0.4rem;
  font-size: 0.75rem; color: var(--text-3); margin-bottom: 0.8rem;
  flex-wrap: wrap;
}
.lesson-breadcrumb a { color: var(--text-2); text-decoration: none; transition: var(--t-fast); }
.lesson-breadcrumb a:hover { color: var(--red-700); }

.lesson-section {
  background: white; border: 1.5px solid var(--border);
  border-radius: var(--r-xl); padding: 1.3rem;
  margin-bottom: 1.2rem; box-shadow: var(--shadow-sm);
}
@media (min-width: 768px) { .lesson-section { padding: 2rem; margin-bottom: 1.5rem; } }

.lesson-sec-title {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 1rem; font-weight: 800;
  margin-bottom: 1.2rem; padding-bottom: 0.8rem;
  border-bottom: 1px dashed var(--border-md);
  color: var(--text-1);
}
.sec-icon {
  width: 38px; height: 38px; flex-shrink: 0;
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}

.intro-content { font-size: 0.95rem; line-height: 1.9; color: var(--text-2); }
.intro-content p { margin-bottom: 0.9rem; }

/* Media embed — responsive 16:9 */
.media-embed-wrap {
  position: relative; padding-bottom: 56.25%; height: 0;
  overflow: hidden; border-radius: var(--r-md);
  background: var(--gray-900); box-shadow: var(--shadow-md);
}
.media-embed-wrap iframe {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  border: none;
}

/* "Open link" button — full width on mobile */
.open-link-btn {
  display: flex; align-items: center; justify-content: center; gap: 0.6rem;
  width: 100%;
  padding: 0.9rem 1.4rem;
  background: linear-gradient(135deg, var(--red-700), var(--red-500));
  border-radius: var(--r-full); color: white;
  text-decoration: none; font-weight: 700; font-size: 0.95rem;
  box-shadow: var(--shadow-red-sm);
  transition: var(--t-bounce); margin-top: 1rem;
  min-height: var(--touch-min);
}
@media (min-width: 480px) {
  .open-link-btn { width: auto; display: inline-flex; }
}
@media (hover: hover) { .open-link-btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-red-md); } }

/* Document item — touch-friendly */
.doc-item {
  display: flex; align-items: center; gap: 0.9rem;
  padding: 1rem 1.2rem;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  text-decoration: none; color: var(--text-1);
  transition: var(--t-bounce); margin-bottom: 0.65rem;
  min-height: 64px; /* touch friendly */
}
@media (hover: hover) { .doc-item:hover { border-color: var(--red-600); transform: translateX(5px); background: var(--red-100); } }
.doc-item:active { transform: scale(0.98); }

.doc-icon {
  width: 46px; height: 46px; flex-shrink: 0;
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
}
.doc-icon.pdf   { background: rgba(255,184,0,0.12); }
.doc-icon.image { background: rgba(52,170,220,0.10); }
.doc-title      { font-weight: 700; font-size: 0.9rem; }
.doc-type       { font-size: 0.72rem; color: var(--text-3); margin-top: 0.1rem; }
.doc-arrow      { color: var(--text-3); margin-left: auto; font-size: 1.1rem; }

/* TOC sidebar — hidden on mobile, shows on desktop */
.toc-sidebar {
  display: none;
}
@media (min-width: 900px) {
  .toc-sidebar {
    display: block;
    position: sticky; top: 76px;
    background: white; border: 1.5px solid var(--border);
    border-radius: var(--r-lg); padding: 1.1rem;
    box-shadow: var(--shadow-sm);
  }
}
.toc-label { font-size: 0.65rem; font-weight: 700; color: var(--text-4); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.5rem; }
.toc-link {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.45rem 0.65rem; border-radius: var(--r-sm);
  text-decoration: none; color: var(--text-2); font-size: 0.82rem; font-weight: 500;
  transition: var(--t-fast); margin-bottom: 0.12rem;
}
.toc-link:hover, .toc-link.active { background: var(--red-100); color: var(--red-700); }

/* Lesson prev/next nav */
.lesson-nav {
  display: flex; align-items: center; gap: 0.7rem;
  margin-top: 1.5rem; padding-top: 1.2rem;
  border-top: 1px dashed var(--border-md);
  flex-wrap: wrap;
}
.nav-btn {
  flex: 1; min-width: 120px;
  padding: 0.85rem 1rem;
  background: white; border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  text-decoration: none; color: var(--text-2);
  display: flex; align-items: center; gap: 0.6rem;
  font-weight: 700; font-size: 0.85rem;
  font-family: var(--font-th); cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: var(--t-bounce);
  min-height: var(--touch-min);
}
@media (hover: hover) { .nav-btn:hover { border-color: var(--red-600); color: var(--red-700); transform: translateY(-2px); box-shadow: var(--shadow-md); } }
.nav-btn.next { justify-content: flex-end; text-align: right; }
.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; pointer-events: none; }

/* ============================================================
   MODULE HERO
   ============================================================ */
.module-hero {
  background: white; border: 1.5px solid var(--border);
  border-radius: var(--r-xl); padding: 1.3rem;
  margin-bottom: 1.5rem; box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
@media (min-width: 768px) { .module-hero { padding: 2rem 2.2rem; } }
.module-hero::before { content:''; position:absolute; top:0; left:0; right:0; height:4px; background:var(--card-gradient); }
.module-hero-deco {
  position:absolute; right:-30px; top:-30px;
  width:140px; height:140px; border-radius:50%;
  background:var(--card-gradient); opacity:0.05; pointer-events:none;
}

/* Filter bar */
.filter-bar {
  display: flex; align-items: center; gap: 0.45rem;
  flex-wrap: wrap; margin-bottom: 1.3rem;
  /* horizontal scroll on tiny screens */
  overflow-x: auto; padding-bottom: 4px;
}
.filter-bar::-webkit-scrollbar { display: none; }
.filter-label { font-size: 0.76rem; font-weight: 700; color: var(--text-3); flex-shrink: 0; }
.filter-btn {
  padding: 0.5rem 0.9rem;
  border-radius: var(--r-full);
  border: 1.5px solid var(--border-md);
  background: white; color: var(--text-2);
  cursor: pointer; font-family: var(--font-th);
  font-size: 0.8rem; font-weight: 700;
  transition: var(--t-bounce);
  box-shadow: var(--shadow-xs);
  white-space: nowrap;
  min-height: 40px;
  -webkit-tap-highlight-color: transparent;
}
@media (hover: hover) { .filter-btn:hover { border-color: var(--red-600); color: var(--red-700); } }
.filter-btn.active {
  background: linear-gradient(135deg, var(--red-700), var(--red-500));
  color: white; border-color: transparent;
  box-shadow: var(--shadow-red-sm);
}

/* ============================================================
   EMPTY STATE
   ============================================================ */
.empty-state { text-align: center; padding: 3rem 1.5rem; color: var(--text-3); }
.empty-icon  { font-size: 3.5rem; margin-bottom: 0.8rem; }
.empty-state h3 { font-size: 1rem; font-weight: 700; color: var(--text-2); margin-bottom: 0.4rem; }

/* ============================================================
   PREMIUM FOOTER
   ============================================================ */
.site-footer {
  background: linear-gradient(135deg, var(--red-900), var(--red-800) 50%, var(--red-700));
  color: white;
  position: relative; overflow: hidden; z-index: 1;
  border-top: 2px solid rgba(255,255,255,0.1);
}
.site-footer::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 20px 20px; pointer-events: none; z-index: -1;
}
.footer-rainbow {
  height: 4px;
  background: linear-gradient(90deg, #F87171, #F43F5E, #E11D48, #BE123C, #9F1239);
  box-shadow: 0 2px 10px rgba(225,29,72,0.3);
}

.footer-inner {
  position: relative; z-index: 1;
  max-width: 1280px; margin: 0 auto;
  padding: 2rem 1.5rem;
  display: grid; gap: 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 1.2fr 2fr 1fr;
    padding: 2.5rem 2.5rem;
    gap: 2.5rem;
  }
}

.footer-brand { display: flex; align-items: flex-start; gap: 1rem; }
.footer-brand img {
  width: 48px; height: 48px; border-radius: 12px;
  background: white; padding: 4px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
  object-fit: contain; transition: var(--t-bounce);
}
@media (hover: hover) { .footer-brand:hover img { transform: rotate(-5deg) scale(1.05); } }
.footer-brand-name { font-size: 1.05rem; font-weight: 800; color: white; line-height: 1.2; letter-spacing: -0.01em; }
.footer-brand-sub  { font-size: 0.78rem; margin-top: 0.2rem; }

.footer-center-txt { font-size: 0.85rem; line-height: 1.6; opacity: 0.9; }
.footer-center-txt strong { display: inline-block; font-size: 0.95rem; font-weight: 700; color: white; margin-bottom: 0.3rem; }

.footer-links-col {
  display: flex; flex-direction: column; gap: 0.5rem;
}
.footer-links-title { font-size: 0.75rem; font-weight: 800; color: white; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 0.2rem; opacity: 0.8; }
.footer-links-col a {
  font-size: 0.88rem; color: rgba(255,255,255,0.85);
  text-decoration: none; transition: var(--t-base);
  display: inline-flex; align-items: center; width: max-content;
  position: relative;
}
.footer-links-col a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 1.5px;
  background: white; transition: var(--t-base);
}
@media (hover: hover) { 
  .footer-links-col a:hover { color: white; transform: translateX(4px); }
  .footer-links-col a:hover::after { width: 100%; }
}

.footer-bottom {
  position: relative; z-index: 1;
  text-align: center; padding: 1rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.05);
  font-size: 0.75rem; opacity: 0.7;
  letter-spacing: 0.01em;
}

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease-bounce);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.d1{transition-delay:0.05s} .d2{transition-delay:0.10s}
.d3{transition-delay:0.15s} .d4{transition-delay:0.20s}
.d5{transition-delay:0.25s}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .reveal, .grade-card, .lesson-card, .btn { transition: none; animation: none; }
  .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--surface-1); }
::-webkit-scrollbar-thumb { background: rgba(192,21,42,0.2); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(192,21,42,0.4); }

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .navbar, .school-banner, .site-footer,
  .filter-bar, .lesson-nav, .toc-sidebar { display: none !important; }
  .container { max-width: 100%; padding: 0; }
  .lesson-layout { grid-template-columns: 1fr; }
}