*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --bg-alt: #f8faf8;
  --text: #1a2e1a;
  --text-secondary: #4a6b4a;
  --text-muted: #7a9a7a;
  --green: #2e7d32;
  --green-light: #4caf50;
  --border: #e0ede0;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-w: 1100px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

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

/* ─── Navigation ─── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--green);
  letter-spacing: -0.3px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-right a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-right a:hover {
  color: var(--green);
}

.nav-right a:last-child {
  background: var(--green);
  color: #fff;
  padding: 6px 18px;
  border-radius: 100px;
  font-weight: 600;
}

.nav-right a:last-child:hover {
  background: var(--green-light);
}

/* ─── Hero ─── */
.hero {
  margin-top: 60px;
  padding: 0 24px;
}

.hero-frame {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  min-height: 480px;
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-video-stack {
  position: absolute;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
  z-index: 1;
}

.hero-stack-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  padding: 3px 12px;
  border-radius: 100px;
  align-self: flex-end;
}

.hero-video-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(6px);
  padding: 3px 14px;
  border-radius: 6px;
  transition: all var(--transition);
  white-space: nowrap;
  width: fit-content;
}

.hero-video-link:hover {
  background: rgba(255, 255, 255, 0.85);
  color: var(--green);
}

/* ─── Sections ─── */
.section {
  padding: 64px 24px;
}

.section-videos {
  padding-top: 4px;
  padding-bottom: 24px;
}

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

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 28px;
  color: var(--text);
}

/* ─── Featured Articles (4 cards) ─── */
.featured-section {
  background: var(--bg-alt);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.featured-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.featured-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--green);
}

.featured-img {
  height: 160px;
  background-size: cover;
  background-position: center;
}

.featured-body {
  padding: 16px;
}

.featured-body h3 {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 6px;
}

.featured-body p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ─── Article Directory ─── */
.directory-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.directory-row {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  transition: all var(--transition);
}

.directory-row:hover {
  border-color: var(--green);
  box-shadow: var(--shadow);
}

.dir-thumb {
  width: 100px;
  height: 70px;
  border-radius: 8px;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}

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

.dir-content h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  line-height: 1.35;
  color: var(--text);
}

.dir-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dir-arrow {
  font-size: 1.3rem;
  color: var(--green);
  font-weight: 300;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.directory-row:hover .dir-arrow {
  transform: translateX(4px);
}

/* ─── Footer ─── */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px 20px;
  background: var(--bg-alt);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-col p,
.footer-col a {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-col a {
  display: block;
  margin-bottom: 6px;
}

.footer-col a:hover {
  color: var(--green);
}

.footer-bottom {
  max-width: var(--max-w);
  margin: 24px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════
   Article Pages (kept for article HTML)
   ═══════════════════════════════════ */
.article-page-hero {
  padding: 120px 24px 48px;
  background: var(--bg-alt);
}

.article-page-hero .section-inner {
  max-width: 720px;
}

.article-page-hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.article-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 40px 0 16px;
  color: var(--green);
}

.article-content h3 {
  font-size: 1.2rem;
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.article-content ul,
.article-content ol {
  margin: 0 0 16px 24px;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 8px;
}

.article-content .video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.article-content .video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.article-content blockquote {
  border-left: 3px solid var(--green);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--bg-alt);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-content .highlight-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 24px 0;
}

.article-content .highlight-box h4 {
  color: var(--green);
  margin-bottom: 8px;
}

.article-nav {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border);
}

.article-nav a {
  font-size: 0.9rem;
  color: var(--green);
}

.article-nav a:hover {
  color: var(--green-light);
}

.article-page-hero .hero-badge {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--green);
  background: rgba(46, 125, 50, 0.08);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}

/* ─── Extreme Temperatures ─── */
.section-extreme {
  padding-top: 8px;
  padding-bottom: 32px;
}

.extreme-grid {
  display: flex;
  flex-direction: column;
}

.extreme-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.extreme-bar {
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(to right, #d84315, #e65100, #ef6c00, #f57c00, #f9a825, #c0ca33, #66bb6a, #26a69a, #1565c0);
  margin-bottom: 16px;
}

.extreme-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.extreme-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.extreme-box {
  min-width: 52px;
  padding: 8px 6px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  text-align: center;
  background: var(--bg);
  transition: all var(--transition);
  flex-shrink: 0;
}

.extreme-box:hover {
  border-color: var(--green);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.extreme-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.2;
}

.extreme-value.hot {
  color: #d84315;
}

.extreme-value.cold {
  color: #1565c0;
}

.extreme-place {
  display: block;
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-top: 2px;
  white-space: nowrap;
}

.extreme-loading,
.extreme-error {
  text-align: center;
  padding: 32px 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (max-width: 700px) {
  .extreme-row {
    flex-direction: column;
    gap: 16px;
  }

  .extreme-group {
    flex-wrap: wrap;
  }
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .featured-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .featured-grid {
    grid-template-columns: 1fr;
  }

  .hero-frame {
    min-height: 300px;
  }

  .hero-video-link {
    font-size: 0.75rem;
    padding: 5px 10px;
  }

  .directory-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .dir-thumb {
    width: 100%;
    height: 160px;
  }

  .dir-arrow {
    align-self: flex-end;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .article-nav {
    flex-direction: column;
    gap: 12px;
  }
}