/* ============================================
   TUDU INFOTECH — Light Mode Premium Redesign
   Demo 2 Stylesheet
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+Devanagari:wght@300;400;500;600;700;800;900&display=swap');

/* ---- CSS Variables (Light Palette) ---- */
:root {
  --primary:        #4f46e5;
  --primary-light:  #6366f1;
  --primary-dark:   #3730a3;
  --accent:         #f59e0b;
  --accent-light:   #d97706;

  --safety:         #059669;
  --safety-bg:      #ecfdf5;
  --safety-border:  #a7f3d0;

  --hardware:       #ea580c;
  --hardware-bg:    #fff7ed;
  --hardware-border:#fed7aa;

  --shortcuts:      #7c3aed;
  --shortcuts-bg:   #f5f3ff;
  --shortcuts-border:#ddd6fe;

  --internet:       #0284c7;
  --internet-bg:    #f0f9ff;
  --internet-border:#bae6fd;

  /* Light surface colors */
  --bg-page:        #f8fafc;
  --bg-white:       #ffffff;
  --bg-subtle:      #f1f5f9;
  --bg-nav:         rgba(255, 255, 255, 0.92);

  --border:         #e2e8f0;
  --border-md:      #cbd5e1;
  --border-hover:   #a5b4fc;

  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;

  --font-main: 'Inter', 'Noto Sans Devanagari', sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-xs:  0 1px 3px rgba(15,23,42,0.08), 0 1px 2px rgba(15,23,42,0.05);
  --shadow-sm:  0 4px 12px rgba(15,23,42,0.08);
  --shadow-md:  0 8px 24px rgba(15,23,42,0.1);
  --shadow-lg:  0 20px 48px rgba(15,23,42,0.12);
  --shadow-primary: 0 8px 24px rgba(79,70,229,0.25);

  --transition:      all 0.3s cubic-bezier(0.4,0,0.2,1);
  --transition-fast: all 0.18s ease;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin:0; padding:0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.navbar.scrolled {
  box-shadow: 0 2px 16px rgba(15,23,42,0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  box-shadow: 0 4px 12px rgba(79,70,229,0.3);
  flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; }
.logo-main  { font-size: 14px; font-weight: 800; color: var(--text-primary); letter-spacing: 0.5px; }
.logo-sub   { font-size: 10px; color: var(--text-muted); font-weight: 400; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
}
.nav-link:hover { color: var(--primary); background: #eef2ff; }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 14px; right: 14px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.btn-primary {
  display: flex; align-items: center; gap: 7px;
  padding: 9px 18px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-primary);
  white-space: nowrap;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(79,70,229,0.4);
}

.hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; border-radius: 8px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: var(--transition); }
.hamburger:hover span { background: var(--primary); }

.nav-mobile { display: none; flex-direction: column; gap: 4px; padding: 12px 24px 16px; border-top: 1px solid var(--border); background: var(--bg-white); }
.nav-mobile.open { display: flex; }
.nav-mobile-link { padding: 12px 16px; border-radius: 10px; font-size: 15px; font-weight: 500; color: var(--text-secondary); transition: var(--transition-fast); }
.nav-mobile-link:hover { background: #eef2ff; color: var(--primary); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 68px;
  overflow: hidden;
  background: linear-gradient(160deg, #eef2ff 0%, #f0fdf4 40%, #fefce8 100%);
}

.hero-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  animation: orb-float 8s ease-in-out infinite;
}
.hero-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(99,102,241,0.18), transparent);
  top: -150px; left: -150px;
}
.hero-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(245,158,11,0.14), transparent);
  bottom: -100px; right: -80px;
  animation-delay: 3s;
}
.hero-orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(16,185,129,0.12), transparent);
  top: 40%; left: 45%;
  animation-delay: 5s;
}

.hero-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(79,70,229,0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black, transparent);
}

@keyframes orb-float {
  0%,100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-28px) scale(1.04); }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
  width: 100%;
}

/* Badge */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 28px;
  animation: fade-in-up 0.6s ease both;
}
.badge-dot {
  width: 8px; height: 8px;
  background: var(--safety);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { box-shadow: 0 0 0 0 rgba(5,150,105,0.35); }
  50%      { box-shadow: 0 0 0 6px rgba(5,150,105,0); }
}

.hero-title {
  display: flex;
  flex-direction: column;
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 24px;
  color: var(--text-primary);
  animation: fade-in-up 0.6s ease 0.1s both;
}
.title-line { display: block; }
.title-line em { font-style: italic; color: var(--accent-light); }
.gradient-text {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 36px;
  animation: fade-in-up 0.6s ease 0.2s both;
}
.hero-desc strong { color: var(--accent-light); font-weight: 700; }

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
  animation: fade-in-up 0.6s ease 0.3s both;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: var(--shadow-primary);
  position: relative;
  overflow: hidden;
}
.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(79,70,229,0.4);
}

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 28px;
  background: var(--bg-white);
  color: var(--text-primary);
  border: 1.5px solid var(--border-md);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-xs);
}
.btn-hero-secondary:hover {
  background: #f8faff;
  border-color: var(--border-hover);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Stats */

/* Hero Right – Floating Cards */
.hero-right {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fade-in-up 0.7s ease 0.2s both;
}
.hero-cards-visual { position: relative; width: 380px; height: 380px; }

.hero-central-glow {
  position: absolute;
  width: 200px; height: 200px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(79,70,229,0.12), transparent 70%);
  border-radius: 50%;
  animation: pulse-glow 3s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%,100% { transform: translate(-50%,-50%) scale(1); opacity:.6; }
  50%      { transform: translate(-50%,-50%) scale(1.3); opacity:1; }
}

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 150px;
  animation: float-card 4s ease-in-out infinite;
  transition: var(--transition);
}
.floating-card:hover {
  transform: scale(1.05) !important;
  border-color: var(--border-hover);
  box-shadow: 0 12px 36px rgba(79,70,229,0.18);
}
.card-1 { top: 10px; left: 20px; animation-delay: 0s; }
.card-2 { top: 10px; right: 0px; animation-delay: 1s; }
.card-3 { bottom: 80px; left: 0px; animation-delay: 2s; }
.card-4 { bottom: 60px; right: 10px; animation-delay: 0.5s; }

@keyframes float-card {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}

.fc-icon {
  font-size: 24px;
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px;
  flex-shrink: 0;
}
.fc-icon.safety    { background: var(--safety-bg); }
.fc-icon.hardware  { background: var(--hardware-bg); }
.fc-icon.shortcuts { background: var(--shortcuts-bg); }
.fc-icon.internet  { background: var(--internet-bg); }

.fc-title { font-size: 13px; font-weight: 700; color: var(--text-primary); }
.fc-sub   { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ============================================
   FEATURED SECTION
   ============================================ */
.featured-section { padding: 56px 0 0; }

.featured-card {
  background: var(--bg-white);
  border: 1.5px solid #ddd6fe;
  border-radius: var(--radius-xl);
  padding: 36px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--shortcuts));
}
.featured-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 56px rgba(79,70,229,0.12);
  border-color: #c4b5fd;
}

.featured-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
  fill: var(--accent-light);
}

.featured-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 36px;
  align-items: center;
}

.featured-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.featured-thumb {
  width: 130px; height: 130px;
  background: var(--shortcuts-bg);
  border: 1.5px solid var(--shortcuts-border);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.thumb-icon { font-size: 52px; position: relative; z-index: 1; }
.thumb-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(124,58,237,0.12), transparent);
  animation: pulse-glow 2.5s ease-in-out infinite;
}

.featured-meta-left { display: flex; flex-direction: column; gap: 8px; align-items: center; }

.tag-chip { padding: 5px 12px; border-radius: 100px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.shortcuts-chip { background: var(--shortcuts-bg); color: var(--shortcuts); border: 1px solid var(--shortcuts-border); }
.read-time { font-size: 12px; color: var(--text-muted); }

.featured-category { font-size: 11px; font-weight: 700; color: var(--shortcuts); text-transform: uppercase; letter-spacing: 2px; margin-bottom: 12px; }
.featured-title { font-size: clamp(1.2rem, 2.5vw, 1.6rem); font-weight: 800; color: var(--text-primary); line-height: 1.3; margin-bottom: 14px; }
.featured-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }

.featured-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}

.btn-featured {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--shortcuts), var(--primary));
  color: white;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 6px 20px rgba(124,58,237,0.3);
}
.btn-featured:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(124,58,237,0.45);
}

/* ============================================
   CATEGORIES STRIP
   ============================================ */
.categories-strip { padding: 36px 0 0; }

.cat-strip-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 14px 20px;
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
}
.cat-strip-label { font-size: 13px; font-weight: 600; color: var(--text-muted); white-space: nowrap; }

.cat-pills { display: flex; gap: 8px; flex-wrap: wrap; flex: 1; }

.cat-pill {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1.5px solid var(--border);
  transition: var(--transition-fast);
  cursor: pointer;
}
.cat-pill:hover { color: var(--primary); background: #eef2ff; border-color: #c7d2fe; }
.cat-pill.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(79,70,229,0.3);
}
.cat-count { font-size: 12px; color: var(--text-muted); font-weight: 500; white-space: nowrap; margin-left: auto; }

/* ============================================
   ARTICLES SECTION
   ============================================ */
.articles-section { padding: 48px 0 80px; }

.section-header { display: flex; align-items: center; gap: 16px; margin-bottom: 36px; }
.section-title { font-size: 1.6rem; font-weight: 800; color: var(--text-primary); white-space: nowrap; }
.section-line { flex: 1; height: 1px; background: linear-gradient(90deg, var(--border), transparent); }

.articles-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }

/* ---- Card Thumbnail ---- */
.card-thumb {
  position: relative;
  width: 100%;
  height: 160px;
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--bg-subtle);
  flex-shrink: 0;
}
.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.article-card:hover .card-thumb img {
  transform: scale(1.05);
}
.card-thumb .card-cat-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border-radius: 100px;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Badge inside card header for read time */
.card-read-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Meta icon */
.meta-icon {
  display: flex;
  align-items: center;
  color: var(--text-muted);
}

/* Article Card */
.article-card {
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  position: relative;
}
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.article-card.hidden { display: none; }

.card-cat-badge { font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.8px; padding: 5px 10px; border-radius: 100px; display: inline-flex; align-items: center; gap: 4px; }
.safety-badge    { background: rgba(240,253,244,0.92); color: var(--safety); border: 1px solid var(--safety-border); }
.hardware-badge  { background: rgba(255,247,237,0.92); color: var(--hardware); border: 1px solid var(--hardware-border); }
.shortcuts-badge { background: rgba(245,243,255,0.92); color: var(--shortcuts); border: 1px solid var(--shortcuts-border); }
.internet-badge  { background: rgba(240,249,255,0.92); color: var(--internet); border: 1px solid var(--internet-border); }

.card-body { padding: 16px 20px; flex: 1; }
.card-title { font-size: 15px; font-weight: 700; color: var(--text-primary); line-height: 1.4; margin-bottom: 10px; }
.card-desc  { font-size: 13px; color: var(--text-secondary); line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.card-footer { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: flex-end; }

.card-read-btn {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition-fast);
  flex-shrink: 0;
}
.safety-btn:hover, .article-card:hover .safety-btn    { background: var(--safety); border-color: var(--safety); color: white; }
.hardware-btn:hover, .article-card:hover .hardware-btn  { background: var(--hardware); border-color: var(--hardware); color: white; }
.shortcuts-btn:hover, .article-card:hover .shortcuts-btn { background: var(--shortcuts); border-color: var(--shortcuts); color: white; }
.internet-btn:hover, .article-card:hover .internet-btn  { background: var(--internet); border-color: var(--internet); color: white; }

/* ============================================
   COURSE BANNER
   ============================================ */
.course-banner { padding: 0 0 80px; }

.course-card {
  background: linear-gradient(135deg, #eef2ff 0%, #f0fdf4 50%, #fefce8 100%);
  border: 1.5px solid #c7d2fe;
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.course-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--safety), var(--accent));
}
.course-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(79,70,229,0.07) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(5,150,105,0.06) 0%, transparent 50%);
  pointer-events: none;
}

.course-content { position: relative; z-index: 1; flex: 1; }
.course-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 16px;
  fill: none;
}
.course-title { font-size: clamp(1.4rem, 2.5vw, 2rem); font-weight: 900; color: var(--text-primary); margin-bottom: 12px; line-height: 1.2; }
.course-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }

.course-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.course-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  background: rgba(255,255,255,0.75);
  border: 1px solid var(--border-md);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.course-cta { display: flex; flex-direction: column; align-items: center; gap: 12px; flex-shrink: 0; position: relative; z-index: 1; }
.btn-course {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 800;
  transition: var(--transition);
  box-shadow: var(--shadow-primary);
  white-space: nowrap;
}
.btn-course:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(79,70,229,0.4);
}
.course-note { font-size: 12px; color: var(--text-muted); }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--bg-white);
  border-top: 1.5px solid var(--border);
  padding: 56px 0 0;
}

.footer-inner { display: grid; grid-template-columns: 1.5fr 1fr; gap: 60px; padding-bottom: 48px; }
.footer-brand { display: flex; flex-direction: column; gap: 10px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.footer-tagline { font-size: 14px; color: var(--text-secondary); }
.footer-address { font-size: 13px; color: var(--text-muted); }
.footer-credit { font-size: 13px; color: var(--text-muted); margin-top: 4px; display: flex; align-items: center; gap: 5px; }

.footer-links { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col-title { font-size: 13px; font-weight: 700; color: var(--text-primary); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.footer-link { font-size: 14px; color: var(--text-muted); transition: var(--transition-fast); display: flex; align-items: center; gap: 7px; }
.footer-link:hover { color: var(--primary); transform: translateX(4px); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-subtle);
}

/* ============================================
   SCROLL TO TOP
   ============================================ */
.scroll-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-primary);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  z-index: 999;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); pointer-events: all; }
.scroll-top:hover { background: var(--primary-dark); transform: translateY(-3px); box-shadow: 0 10px 28px rgba(79,70,229,0.4); }

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.revealed { opacity: 1; transform: translateY(0); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; gap: 40px; text-align: center; padding: 60px 24px; }
  .hero-left { align-items: center; }

  .hero-right { display: none; }
  .articles-grid { grid-template-columns: repeat(2,1fr); }
  .featured-inner { grid-template-columns: 1fr; gap: 24px; }
  .featured-left { flex-direction: row; align-items: center; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .articles-grid { grid-template-columns: 1fr; }
  .course-card { flex-direction: column; gap: 28px; padding: 32px 24px; }
  .footer-inner { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-container { padding: 40px 16px; }
  .hero-actions { flex-direction: column; }
  .btn-hero-primary, .btn-hero-secondary { width: 100%; justify-content: center; }
  .course-card { padding: 24px 20px; }
  .featured-card { padding: 20px; }

}