/* ============================================================
   base-product theme — main.css
   Product / Landing Page / SaaS theme
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --clr-bg: #ffffff;
  --clr-bg-alt: #f8fafc;
  --clr-surface: #ffffff;
  --clr-border: #e2e8f0;
  --clr-primary: #6366f1;
  --clr-primary-hover: #4f46e5;
  --clr-primary-light: #eef2ff;
  --clr-primary-dark: #3730a3;
  --clr-accent: #ec4899;
  --clr-accent2: #14b8a6;
  --clr-text: #1e293b;
  --clr-text-muted: #64748b;
  --clr-text-light: #94a3b8;
  --clr-heading: #0f172a;
  --clr-card-bg: #ffffff;
  --clr-nav-bg: rgba(255, 255, 255, 0.95);
  --clr-nav-text: #334155;
  --clr-hero-bg: #0f172a;
  --clr-hero-text: #ffffff;
  --clr-footer-bg: #020617;
  --clr-footer-text: #94a3b8;
  --clr-cta-bg: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-accent) 100%);
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: var(--font-sans);
  --font-body: var(--font-sans);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-card: 0 2px 16px rgba(99, 102, 241, 0.08);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 70px;
  --gradient-primary: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
  --gradient-cta: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-accent) 100%);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  flex: 1;
}

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

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

a:hover {
  color: var(--clr-primary-hover);
}

ul, ol {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--clr-heading);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--clr-primary);
  border: 2px solid var(--clr-primary);
}

.btn-outline:hover {
  background: var(--clr-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.6);
  color: #fff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.0625rem;
}

/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.badge-primary {
  background: var(--clr-primary-light);
  color: var(--clr-primary);
}

.badge-accent {
  background: #fdf2f8;
  color: var(--clr-accent);
}

/* ---------- Section ---------- */
.section {
  padding: 5rem 0;
}

.section-sm {
  padding: 3rem 0;
}

.section-lg {
  padding: 7rem 0;
}

.section-alt {
  background: var(--clr-bg-alt);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3.5rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clr-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--clr-text-muted);
  font-size: 1.0625rem;
  line-height: 1.7;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--clr-nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
  transition: box-shadow var(--transition), background var(--transition);
}

.site-nav.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 2rem;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--clr-heading);
  letter-spacing: -0.03em;
  flex-shrink: 0;
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--clr-primary);
}

.nav-logo img {
  height: 36px;
  width: auto;
  border-radius: var(--radius-sm);
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  color: #fff;
  flex-shrink: 0;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  justify-content: center;
}

.nav-link {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-nav-text);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--clr-primary);
  background: var(--clr-primary-light);
}

/* Nav CTA */
.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
  padding: 0;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: var(--clr-bg-alt);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-nav-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: 1.25rem 1.5rem 1.75rem;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  flex-direction: column;
  gap: 0.25rem;
  animation: slideDown 0.2s ease;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile .nav-link {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 1rem;
}

.nav-mobile-cta {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--clr-border);
}

.nav-mobile-cta .btn {
  width: 100%;
  justify-content: center;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  padding: calc(var(--header-height) + 5rem) 0 6rem;
  background: var(--gradient-hero);
  overflow: hidden;
  min-height: 88vh;
  display: flex;
  align-items: center;
}

/* Animated background blobs */
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: blobFloat 8s ease-in-out infinite alternate;
}

.hero::before {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--clr-primary) 0%, transparent 70%);
  top: -100px;
  right: -100px;
}

.hero::after {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--clr-accent) 0%, transparent 70%);
  bottom: -100px;
  left: -80px;
  animation-delay: -4s;
  animation-direction: alternate-reverse;
}

@keyframes blobFloat {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(40px, -40px) scale(1.08); }
  100% { transform: translate(-20px, 30px) scale(0.95); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.125rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(12px);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2rem;
  letter-spacing: 0.03em;
  animation: fadeInUp 0.6s ease both;
}

.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.5); }
  50%       { box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
}

.hero-title {
  color: #fff;
  font-size: clamp(2.25rem, 6vw, 4rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s 0.1s ease both;
}

.hero-title .highlight {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: rgba(255, 255, 255, 0.75);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.7;
  max-width: 580px;
  margin: 0 auto 2.5rem;
  animation: fadeInUp 0.6s 0.2s ease both;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s 0.3s ease both;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s 0.4s ease both;
}

.hero-stat {
  text-align: center;
  color: rgba(255, 255, 255, 0.9);
}

.hero-stat strong {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat span {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.55);
}

.hero-divider {
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.15);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   FEATURES SECTION
   ============================================================ */
.features {
  padding: 6rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--clr-card-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition);
  border-radius: inherit;
}

.feature-card:hover {
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-card), 0 0 0 1px var(--clr-primary);
  transform: translateY(-4px);
}

.feature-card:hover::before {
  opacity: 0.03;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--clr-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.625rem;
  margin-bottom: 1.25rem;
  transition: all var(--transition);
  position: relative;
}

.feature-card:hover .feature-icon {
  background: var(--gradient-primary);
  transform: scale(1.1) rotate(-3deg);
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--clr-heading);
  margin-bottom: 0.625rem;
  position: relative;
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
  position: relative;
  margin-bottom: 0;
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-primary);
  position: relative;
  transition: gap var(--transition);
}

.feature-link:hover {
  gap: 0.625rem;
}

/* Feature icon emojis by index */
.feature-card:nth-child(1) .feature-icon { background: #eef2ff; }
.feature-card:nth-child(2) .feature-icon { background: #fdf4ff; }
.feature-card:nth-child(3) .feature-icon { background: #f0fdf4; }
.feature-card:nth-child(4) .feature-icon { background: #fff7ed; }
.feature-card:nth-child(5) .feature-icon { background: #f0f9ff; }
.feature-card:nth-child(6) .feature-icon { background: #fdf2f8; }

.feature-card:nth-child(1):hover .feature-icon,
.feature-card:nth-child(2):hover .feature-icon,
.feature-card:nth-child(3):hover .feature-icon,
.feature-card:nth-child(4):hover .feature-icon,
.feature-card:nth-child(5):hover .feature-icon,
.feature-card:nth-child(6):hover .feature-icon {
  background: var(--gradient-primary);
}

/* ============================================================
   ARTICLE CARDS
   ============================================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

.article-card {
  background: var(--clr-card-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-card), 0 8px 40px rgba(99, 102, 241, 0.1);
  transform: translateY(-4px);
}

.article-card-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--clr-bg-alt);
  position: relative;
}

.article-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.article-card:hover .article-card-img img {
  transform: scale(1.05);
}

.article-card-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--clr-primary-light) 0%, #fdf2f8 100%);
  font-size: 3rem;
}

.article-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.875rem;
  flex-wrap: wrap;
}

.article-card-category {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--clr-primary-light);
  color: var(--clr-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
}

.article-card-category:hover {
  background: var(--clr-primary);
  color: #fff;
}

.article-card-date {
  font-size: 0.8125rem;
  color: var(--clr-text-light);
}

.article-card-ai {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.625rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #eef2ff, #fdf2f8);
  color: var(--clr-primary);
  font-size: 0.75rem;
  font-weight: 600;
}

.article-card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--clr-heading);
  line-height: 1.4;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}

.article-card-title a {
  color: inherit;
  text-decoration: none;
}

.article-card:hover .article-card-title a {
  color: var(--clr-primary);
}

.article-card-excerpt {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--clr-border);
  gap: 0.5rem;
}

.article-card-views {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--clr-text-light);
}

.article-card-read-more {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-primary);
  display: flex;
  align-items: center;
  gap: 0.375rem;
  transition: gap var(--transition);
}

.article-card-read-more:hover {
  gap: 0.625rem;
  color: var(--clr-primary-hover);
}

/* Sticky Article Card */
.article-card.sticky {
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-card);
}

.sticky-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  z-index: 1;
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section {
  padding: 5rem 0;
  background: var(--gradient-cta);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-title {
  color: #fff;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.cta-subtitle {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.0625rem;
  margin-bottom: 2.25rem;
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-white {
  background: #fff;
  color: var(--clr-primary);
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  color: var(--clr-primary-hover);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--clr-footer-bg);
  color: var(--clr-footer-text);
  padding: 4rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  padding-bottom: 3rem;
}

.footer-brand {
  grid-column: 1;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.1875rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  text-decoration: none;
  margin-bottom: 1rem;
}

.footer-logo:hover {
  color: var(--clr-primary);
}

.footer-logo-icon {
  width: 34px;
  height: 34px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}

.footer-tagline {
  font-size: 0.9375rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
  color: #64748b;
}

.footer-social {
  display: flex;
  gap: 0.625rem;
}

.social-link {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--clr-footer-text);
  transition: all var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: #fff;
  transform: translateY(-2px);
}

.footer-heading {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 1.25rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-links a {
  font-size: 0.9375rem;
  color: #64748b;
  transition: color var(--transition);
  text-decoration: none;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.875rem;
  color: #475569;
}

.footer-copy a {
  color: #64748b;
  text-decoration: none;
  transition: color var(--transition);
}

.footer-copy a:hover {
  color: #fff;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  font-size: 0.875rem;
  color: #475569;
  text-decoration: none;
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: #fff;
}

/* ============================================================
   ARTICLE PAGE
   ============================================================ */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3rem;
  padding: calc(var(--header-height) + 2.5rem) 0 4rem;
  align-items: start;
}

.article-main {}

.article-header {
  margin-bottom: 2rem;
}

.article-meta-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.article-title {
  font-size: clamp(1.625rem, 4vw, 2.5rem);
  line-height: 1.25;
  color: var(--clr-heading);
  margin-bottom: 1.25rem;
  letter-spacing: -0.025em;
}

.article-info {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  padding: 1.125rem 1.5rem;
  background: var(--clr-bg-alt);
  border-radius: var(--radius);
  border: 1px solid var(--clr-border);
  margin-bottom: 2rem;
}

.article-info-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.article-cover {
  width: 100%;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin-bottom: 2.5rem;
  background: var(--clr-bg-alt);
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--clr-text);
}

.article-body h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--clr-border);
  color: var(--clr-heading);
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
  color: var(--clr-heading);
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body a {
  color: var(--clr-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body ul,
.article-body ol {
  list-style: revert;
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  border-left: 4px solid var(--clr-primary);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: var(--clr-primary-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--clr-text-muted);
}

.article-body pre {
  background: var(--clr-hero-bg);
  color: #e2e8f0;
  padding: 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 2rem 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.article-body code {
  background: var(--clr-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--clr-primary-dark);
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body img {
  border-radius: var(--radius);
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.9375rem;
}

.article-body th,
.article-body td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--clr-border);
}

.article-body th {
  font-weight: 700;
  background: var(--clr-bg-alt);
  color: var(--clr-heading);
}

.article-body tr:hover td {
  background: var(--clr-bg-alt);
}

/* Article Tags */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--clr-border);
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.875rem;
  border-radius: var(--radius-full);
  background: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: all var(--transition);
}

.tag-chip:hover {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: #fff;
}

/* Article Sidebar */
.article-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}

.sidebar-widget {
  background: var(--clr-card-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.sidebar-widget:last-child {
  margin-bottom: 0;
}

.sidebar-widget-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--clr-text-muted);
  margin-bottom: 1.125rem;
}

.sidebar-popular-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-popular-item {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.sidebar-popular-num {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--clr-primary-light);
  color: var(--clr-primary);
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.sidebar-popular-item:nth-child(1) .sidebar-popular-num {
  background: var(--gradient-primary);
  color: #fff;
}

.sidebar-popular-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}

.sidebar-popular-title:hover {
  color: var(--clr-primary);
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sidebar-categories {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.sidebar-category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--clr-text);
  text-decoration: none;
  transition: all var(--transition);
}

.sidebar-category-link:hover {
  background: var(--clr-primary-light);
  color: var(--clr-primary);
}

.sidebar-category-count {
  font-size: 0.8rem;
  color: var(--clr-text-light);
  background: var(--clr-bg-alt);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

/* Related Articles */
.related-articles {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--clr-border);
}

.related-title {
  font-size: 1.5rem;
  margin-bottom: 2rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* ============================================================
   CATEGORY PAGE
   ============================================================ */
.page-hero {
  background: var(--gradient-hero);
  padding: calc(var(--header-height) + 3rem) 0 3.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
}

.page-hero-inner {
  position: relative;
  z-index: 1;
}

.page-hero-title {
  color: #fff;
  margin-bottom: 0.75rem;
}

.page-hero-subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.0625rem;
  max-width: 560px;
  margin: 0 auto;
}

.category-layout {
  padding: 3.5rem 0;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  align-items: start;
}

/* ============================================================
   SEARCH PAGE
   ============================================================ */
.search-hero {
  background: var(--gradient-hero);
  padding: calc(var(--header-height) + 2.5rem) 0 3rem;
  text-align: center;
  position: relative;
}

.search-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.25) 0%, transparent 65%);
}

.search-hero-inner {
  position: relative;
  z-index: 1;
}

.search-hero-title {
  color: #fff;
  margin-bottom: 1.5rem;
}

.search-form {
  display: flex;
  max-width: 560px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  backdrop-filter: blur(12px);
  padding: 0.25rem;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 0.75rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: #fff;
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.search-btn {
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.search-btn:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.search-results-count {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9375rem;
  margin-top: 1.25rem;
}

.search-layout {
  padding: 3.5rem 0 4rem;
}

/* ============================================================
   PAGE (STATIC PAGE)
   ============================================================ */
.static-page-layout {
  padding: calc(var(--header-height) + 3rem) 0 5rem;
}

.static-page-header {
  max-width: 760px;
  margin: 0 auto 3rem;
  text-align: center;
}

.static-page-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

.static-page-meta {
  color: var(--clr-text-muted);
  font-size: 0.9375rem;
}

.static-page-content {
  max-width: 760px;
  margin: 0 auto;
}

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
  padding: 1rem 0;
  font-size: 0.875rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.breadcrumb-item a {
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

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

.breadcrumb-item.current {
  color: var(--clr-text);
  font-weight: 500;
}

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

/* Breadcrumb on dark bg */
.breadcrumb-dark .breadcrumb-item a {
  color: rgba(255, 255, 255, 0.5);
}

.breadcrumb-dark .breadcrumb-item a:hover {
  color: rgba(255, 255, 255, 0.9);
}

.breadcrumb-dark .breadcrumb-item.current {
  color: rgba(255, 255, 255, 0.85);
}

.breadcrumb-dark .breadcrumb-sep {
  color: rgba(255, 255, 255, 0.3);
}

/* ============================================================
   PAGINATION
   ============================================================ */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 2.5rem 0 1rem;
  flex-wrap: wrap;
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  text-decoration: none;
  transition: all var(--transition);
  line-height: 1;
}

.pagination-btn:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  background: var(--clr-primary-light);
}

.pagination-btn.active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.pagination-btn.disabled {
  opacity: 0.4;
  pointer-events: none;
  cursor: default;
}

.pagination-ellipsis {
  color: var(--clr-text-light);
  padding: 0 0.25rem;
}

/* ============================================================
   404 PAGE
   ============================================================ */
.not-found {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.not-found::before {
  content: '404';
  position: absolute;
  font-size: 40vw;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.03);
  letter-spacing: -0.05em;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

.not-found-inner {
  position: relative;
  z-index: 1;
  max-width: 540px;
}

.not-found-code {
  font-size: clamp(5rem, 15vw, 9rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 1rem;
}

.not-found-title {
  color: #fff;
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.not-found-desc {
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.0625rem;
  margin-bottom: 2.5rem;
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.text-center { text-align: center; }
.text-muted { color: var(--clr-text-muted); }
.text-primary { color: var(--clr-primary); }
.mt-auto { margin-top: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.w-full { width: 100%; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.flex-wrap { flex-wrap: wrap; }

/* Page top padding for nav */
.page-with-nav {
  padding-top: var(--header-height);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--clr-text-muted);
}

.empty-state-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-heading);
  margin-bottom: 0.5rem;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
.fade-in {
  animation: fadeIn 0.5s ease both;
}

.fade-in-up {
  animation: fadeInUp 0.5s ease both;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Stagger animation helpers */
[data-delay="1"] { animation-delay: 0.1s; }
[data-delay="2"] { animation-delay: 0.2s; }
[data-delay="3"] { animation-delay: 0.3s; }
[data-delay="4"] { animation-delay: 0.4s; }
[data-delay="5"] { animation-delay: 0.5s; }

/* Intersection observer target */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
  .category-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .section { padding: 3.5rem 0; }
  .section-lg { padding: 5rem 0; }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: calc(var(--header-height) + 3rem) 0 4rem;
    min-height: 75vh;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .hero-divider {
    display: none;
  }

  .features-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
  }

  .article-layout {
    padding-top: calc(var(--header-height) + 1.5rem);
    padding-bottom: 3rem;
  }

  .search-form {
    flex-direction: column;
    border-radius: var(--radius-lg);
    gap: 0.5rem;
  }

  .search-input {
    text-align: center;
  }

  .search-btn {
    border-radius: var(--radius);
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-actions .btn {
    justify-content: center;
  }

  .pagination {
    gap: 0.25rem;
  }

  .pagination-btn {
    min-width: 36px;
    height: 36px;
    font-size: 0.85rem;
  }
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  .site-nav,
  .site-footer,
  .article-sidebar,
  .cta-section,
  .related-articles {
    display: none !important;
  }

  .article-layout {
    grid-template-columns: 1fr;
    padding-top: 0;
  }

  body {
    font-size: 12pt;
    color: #000;
  }
}