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

/* ===========================
   Design Tokens
   =========================== */
:root {
  --color-primary: #1B6B5A;
  --color-primary-hover: #2A8F7A;
  --color-accent: #E8752A;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-text: #1A1A2E;
  --color-text-secondary: #5A6275;
  --color-border: #E2E5EB;
  --color-trending: #D93025;

  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 16px;
  --line-height-body: 1.65;
  --line-height-heading: 1.2;

  --max-width: 1200px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 40px;
  --spacing-2xl: 64px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

/* ===========================
   Base Styles
   =========================== */
html {
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--line-height-body);
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ===========================
   Header
   =========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.logo a {
  color: inherit;
}

/* Desktop Nav */
.main-nav {
  display: none;
}

.main-nav ul {
  display: flex;
  gap: var(--spacing-lg);
}

.main-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
}

/* Hamburger */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

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

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Nav */
.mobile-nav {
  display: none;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md);
}

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

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-nav a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--color-primary);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
  padding: var(--spacing-lg) var(--spacing-md);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: block;
}

.hero-card img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.1) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--spacing-lg);
}

.hero-overlay .badge {
  margin-bottom: var(--spacing-sm);
}

.hero-overlay h1 {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-sm);
}

.hero-overlay .meta {
  color: rgba(255,255,255,0.8);
  font-size: 0.8125rem;
}

/* ===========================
   Badges
   =========================== */
.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--spacing-xs);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--color-primary);
  color: #fff;
}

/* ===========================
   Section Shared
   =========================== */
.section {
  padding: var(--spacing-xl) var(--spacing-md);
}

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

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  font-size: 1.375rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--color-primary);
}

.trending-dot {
  width: 10px;
  height: 10px;
  background: var(--color-trending);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ===========================
   Trending Cards Grid
   =========================== */
.trending-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
  display: block;
}

.card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-body {
  padding: var(--spacing-md);
}

.card-body .badge {
  margin-bottom: var(--spacing-sm);
}

.card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.card-body .meta {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

/* ===========================
   Popular Section
   =========================== */
.popular-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.popular-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow 0.2s;
}

.popular-item:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.popular-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-border);
  min-width: 36px;
  text-align: center;
  flex-shrink: 0;
}

.popular-thumb {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.popular-content {
  flex: 1;
  min-width: 0;
}

.popular-content .badge {
  margin-bottom: var(--spacing-xs);
  font-size: 0.6875rem;
  padding: 2px 6px;
}

.popular-content h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: var(--spacing-xs);
}

.popular-content .meta {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* ===========================
   Footer
   =========================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

/* ===========================
   Responsive — Tablet (768px+)
   =========================== */
@media (min-width: 768px) {
  .trending-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-card img {
    height: 400px;
  }

  .hero-overlay h1 {
    font-size: 2rem;
  }

  .popular-thumb {
    width: 96px;
    height: 96px;
  }
}

/* ===========================
   Responsive — Desktop (1024px+)
   =========================== */
@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }

  .main-nav {
    display: block;
  }

  .hero-card img {
    height: 480px;
  }

  .hero-overlay {
    padding: var(--spacing-xl);
  }

  .hero-overlay h1 {
    font-size: 2.5rem;
    max-width: 700px;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }

  .card-image {
    height: 200px;
  }

  .card-body h3 {
    font-size: 1.0625rem;
  }
}