/* Stylesheet for frontend/zh-CN/blog/index.html (blog list page). */
:root {
  --bg: #f7f5f2;
  --bg-card: #ffffff;
  --bg-soft: #eef6f4;
  --ink: #16202e;
  --ink-soft: #5c6b7a;
  --accent: #2d9c8a;
  --accent-light: #d4f0eb;
  --accent-dark: #1f7a6c;
  --warm: #e8a87c;
  --warm-light: #fdf0e8;
  --line: #e2e6ea;
  --shadow: 0 4px 24px rgba(22, 32, 46, 0.06);
  --shadow-lg: 0 24px 64px rgba(22, 32, 46, 0.12);
  --font-display: 'Outfit', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
  height: 100vh;
}

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

.container { width: min(1180px, 92vw); margin: 0 auto; }

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1), transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible { opacity: 1; transform: translateY(0); }

/* Nav */
.nav-wrap {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 0 4vw;
  pointer-events: none;
}

.nav-pill {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 32px rgba(22, 32, 46, 0.1);
  border-radius: 999px;
  padding: 8px 10px 8px 18px;
  width: min(920px, 100%);
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.logo-mark { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.logo-mark img { width: 100%; height: 100%; object-fit: contain; display: block; }

.nav-links { display: flex; align-items: center; gap: 2px; list-style: none; }

.nav-links a {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 8px 14px;
  border-radius: 999px;
  transition: all 0.2s;
}

.nav-links a:hover { color: var(--accent-dark); background: var(--accent-light); }
.nav-links a.active { color: #fff; background: var(--ink); }

.nav-right { display: flex; align-items: center; gap: 8px; }

.lang-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  cursor: pointer;
  background: #fff;
}

.lang-chip i { color: var(--accent); }

.lang-switch { position: relative; }

.lang-chip { cursor: pointer; border: none; font-family: inherit; transition: border-color 0.2s, color 0.2s; }
.lang-chip:hover { border-color: var(--accent); color: var(--accent-dark); }

.lang-caret { font-size: 0.6rem; margin-left: 2px; color: var(--ink-soft); transition: transform 0.2s; }
.lang-switch.open .lang-caret { transform: rotate(180deg); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 200px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 8px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  z-index: 120;
}

.lang-switch.open .lang-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: none;
  background: none;
  font-family: var(--font-body);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s;
  text-align: left;
}

.lang-option:hover:not(:disabled) { background: var(--accent-light); }
.lang-option:disabled { color: var(--ink-soft); cursor: not-allowed; opacity: 0.7; }

.lang-flag { font-size: 1rem; line-height: 1; flex-shrink: 0; }
.lang-option-name { flex: 1; }
.lang-check { color: var(--accent); font-size: 0.8rem; flex-shrink: 0; }

.lang-soon {
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 999px;
  flex-shrink: 0;
  white-space: nowrap;
}


.nav-gh {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: transform 0.2s, background 0.2s;
}

.nav-gh:hover { transform: rotate(-8deg) scale(1.08); background: var(--accent-dark); }

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--ink);
  cursor: pointer;
  padding: 0;
}

.mobile-menu { display: none; }


@media (max-width: 1080px) {
  .nav-links { display: none; }
  .menu-toggle { display: flex; }

  .mobile-menu.open {
    display: flex;
    position: fixed;
    top: 86px;
    left: 4vw;
    right: 4vw;
    z-index: 99;
    flex-direction: column;
    gap: 4px;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(16px);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 14px;
    box-shadow: var(--shadow-lg);
    list-style: none;
  }

  .mobile-menu a { display: block; padding: 12px 18px; border-radius: 12px; font-weight: 500; color: var(--ink); }
  .mobile-menu a:hover, .mobile-menu a.active { background: var(--accent-light); color: var(--accent-dark); }
}

.btn-major {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.25s;
  border: none;
  cursor: pointer;
}

.btn-major .arr {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  transition: transform 0.25s;
}

.btn-major:hover { background: var(--accent-dark); transform: translateY(-3px); box-shadow: 0 12px 28px rgba(31, 122, 108, 0.35); }
.btn-major:hover .arr { transform: translateX(3px); background: rgba(255, 255, 255, 0.22); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  transition: all 0.25s;
  background: transparent;
}

.btn-ghost:hover { background: var(--ink); color: #fff; transform: translateY(-3px); }

/* Hero */
.blog-hero { position: relative; padding: 140px 0 56px; overflow: hidden; }

.blog-hero-orb {
  position: absolute;
  top: -120px;
  left: -80px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: var(--accent-light);
  filter: blur(80px);
  opacity: 0.55;
  pointer-events: none;
}

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

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent-dark);
  margin-bottom: 20px;
}

.hero-eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

.blog-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  max-width: 14em;
}

.blog-hero h1 .accent-word {
  background: linear-gradient(120deg, var(--accent) 0%, #3db89e 60%, var(--warm) 110%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.blog-hero .lead {
  max-width: 560px;
  font-size: 1.02rem;
  color: var(--ink-soft);
  line-height: 1.85;
}

/* Category filter */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 32px 0 0;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1.5px solid var(--line);
  background: var(--bg-card);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}

.filter-chip:hover { border-color: var(--accent); color: var(--accent-dark); }

.filter-chip.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

/* Article grid */
.articles-section { padding-top: 8px; }

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 26px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.article-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.article-card .a-icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--accent-light);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: 18px;
}

.article-card .a-cat {
  display: inline-flex;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.article-card h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  flex: 0;
}

.article-card p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.76rem;
  color: var(--ink-soft);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.article-meta .arrow {
  margin-left: auto;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.74rem;
  color: var(--ink);
  transition: all 0.2s;
}

.article-card:hover .article-meta .arrow {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-soft);
  border: 1px dashed var(--line);
  border-radius: 22px;
  background: var(--bg-card);
}

.empty-state i { font-size: 1.6rem; color: var(--accent); margin-bottom: 12px; display: block; }

/* CTA */
.cta-band {
  background: linear-gradient(135deg, #1f2a38 0%, #2a3a4d 100%);
  border-radius: 28px;
  padding: 48px 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  color: #dce4ec;
  margin-top: 56px;
}

.cta-band h2 { font-family: var(--font-display); font-size: clamp(1.4rem, 2.5vw, 1.85rem); font-weight: 700; color: #fff; margin-bottom: 8px; }
.cta-band p { font-size: 0.92rem; max-width: 420px; line-height: 1.7; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.cta-band .btn-major { background: #fff; color: #1f2a38; }
.cta-band .btn-major:hover { background: var(--accent-light); color: var(--accent-dark); }
.cta-band .btn-major .arr { background: var(--accent); color: #fff; }
.cta-band .btn-ghost { border-color: rgba(255,255,255,0.5); color: #fff; }
.cta-band .btn-ghost:hover { background: #fff; color: #1f2a38; }

/* Footer */
.footer { background: var(--bg-card); border-top: 1px solid var(--line); padding: 72px 0 0; overflow: hidden; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 56px; }
.footer .logo { margin-bottom: 14px; }
.footer-desc { font-size: 0.88rem; line-height: 1.7; max-width: 280px; color: var(--ink-soft); }
.footer h4 { font-size: 0.82rem; font-weight: 600; letter-spacing: 0.14em; color: var(--ink-soft); margin-bottom: 18px; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.footer-links a { font-size: 0.9rem; color: var(--ink); transition: color 0.2s; }
.footer-links a:hover { color: var(--accent-dark); }
.footer-lang { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-lang a { padding: 5px 12px; border-radius: 999px; font-size: 0.78rem; border: 1px solid var(--line); color: var(--ink-soft); cursor: pointer; }
.footer-lang a.active { background: var(--ink); border-color: var(--ink); color: #fff; }
.footer-bottom { border-top: 1px solid var(--line); padding: 22px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.8rem; color: var(--ink-soft); }
.footer-wordmark {
  font-family: var(--font-display);
  font-size: clamp(5rem, 16vw, 13rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.9;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line);
  user-select: none;
  margin-bottom: -0.18em;
  pointer-events: none;
}

section { padding: 40px 0; }

@media (max-width: 960px) {
  .article-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-band { flex-direction: column; text-align: center; }
  .cta-band p { margin: 0 auto; }
  .cta-actions { justify-content: center; }
}

@media (max-width: 640px) {
  .lang-chip-text,
  .lang-caret {
    display: none;
  }

  .lang-chip {
    width: 36px;
    height: 36px;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
    background: var(--ink);
    border-color: var(--ink);
  }

  .lang-chip i {
    color: #fff;
  }

  .lang-dropdown {
    right: -8px;
  }
  .article-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}