/* ══════════════════════════════════════════════
   Fantula Blog — Premium Dark Design v2.0
   匹配主站玻璃拟态风格 + 动态视觉升级
══════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-deep:     #020617;
  --bg-dark:     #0f172a;
  --bg-card:     rgba(15,23,42,.8);
  --bg-glass:    rgba(9,14,30,.9);
  --border:      hsla(0,0%,100%,.07);
  --border-h:    hsla(0,0%,100%,.15);
  --blue:        #178fc6;
  --blue-2:      #3b82f6;
  --blue-glow:   rgba(23,143,198,.35);
  --orange:      #f97316;
  --orange-glow: rgba(249,115,22,.25);
  --text-1:      #f1f5f9;
  --text-2:      #94a3b8;
  --text-3:      #475569;
  --r-xl:        28px;
  --r-lg:        20px;
  --r-md:        14px;
  --r-sm:        10px;
  --shadow-card: 0 4px 24px rgba(0,0,0,.4), 0 1px 0 hsla(0,0%,100%,.04) inset;
  --shadow-glow: 0 0 40px var(--blue-glow);
}

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

body {
  font-family: 'Outfit', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  background: var(--bg-deep);
  color: var(--text-1);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── 背景网格 + 光晕 ── */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(23,143,198,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,143,198,.04) 1px, transparent 1px);
  background-size: 60px 60px;
}
body::after {
  content: '';
  position: fixed; top: -20%; left: 50%; transform: translateX(-50%);
  width: 900px; height: 500px; z-index: 0; pointer-events: none;
  background: radial-gradient(ellipse, rgba(23,143,198,.12) 0%, rgba(249,115,22,.05) 40%, transparent 70%);
  animation: aurora 8s ease-in-out infinite alternate;
}
@keyframes aurora {
  from { opacity: .7; transform: translateX(-50%) scaleX(1); }
  to   { opacity: 1;  transform: translateX(-50%) scaleX(1.1); }
}

a { color: inherit; text-decoration: none; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }

/* ══ HEADER ══ */
.header {
  position: sticky; top: 0; z-index: 100;
  height: 64px;
  background: var(--bg-glass);
  backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background .3s, box-shadow .3s;
}
.header.scrolled {
  background: rgba(2,6,23,.95);
  box-shadow: 0 4px 30px rgba(0,0,0,.5);
}
.header-inner {
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 800; letter-spacing: -.02em;
}
.logo-icon {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), var(--orange));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  box-shadow: 0 0 16px var(--blue-glow);
}
.logo-accent { color: var(--blue); }
.nav { display: flex; align-items: center; gap: 12px; }
.nav-cta {
  font-size: .875rem; font-weight: 600;
  padding: 8px 18px; border-radius: 100px;
  background: linear-gradient(135deg, var(--blue), #0ea5e9);
  color: #fff;
  box-shadow: 0 0 20px rgba(23,143,198,.4);
  transition: opacity .2s, transform .2s, box-shadow .2s;
}
.nav-cta:hover { opacity: .9; transform: scale(1.04); box-shadow: 0 0 32px rgba(23,143,198,.6); }
.lang-switch { display: flex; gap: 4px; }
.lang-btn {
  background: none; border: 1px solid var(--border);
  color: var(--text-3); font-size: .78rem; font-weight: 500;
  padding: 5px 11px; border-radius: 100px;
  cursor: pointer; transition: all .2s; font-family: inherit;
}
.lang-btn.active, .lang-btn:hover {
  color: var(--text-1); border-color: var(--blue);
  background: rgba(23,143,198,.18);
}

/* ══ HERO ══ */
.hero {
  position: relative; overflow: hidden;
  padding: 80px 0 56px; text-align: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .8rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  color: var(--blue); border: 1px solid rgba(23,143,198,.35);
  background: rgba(23,143,198,.1);
  padding: 6px 14px; border-radius: 100px; margin-bottom: 20px;
}
.hero-badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--blue); animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.8)} }

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 18px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--blue) 0%, #0ea5e9 40%, var(--orange) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: grad-shift 4s ease infinite;
}
@keyframes grad-shift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.hero-sub {
  color: var(--text-2); font-size: 1.05rem; line-height: 1.8;
  margin-bottom: 14px; max-width: 560px; margin-left: auto; margin-right: auto;
}
.hero-platforms {
  display: flex; justify-content: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 36px;
}
.platform-chip {
  display: flex; align-items: center; gap: 6px;
  font-size: .82rem; color: var(--text-3);
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 5px 13px; border-radius: 100px;
  backdrop-filter: blur(8px);
  transition: all .25s;
}
.platform-chip:hover { color: var(--text-2); border-color: var(--border-h); transform: translateY(-2px); }

/* ── Category Bar ── */
.category-bar { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.cat-btn {
  position: relative; overflow: hidden;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-2); font-size: .875rem; font-weight: 500;
  padding: 8px 20px; border-radius: 100px;
  cursor: pointer; transition: all .25s; font-family: inherit;
  backdrop-filter: blur(8px);
}
.cat-btn::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(135deg, rgba(23,143,198,.3), rgba(249,115,22,.2));
  opacity: 0; transition: opacity .25s;
}
.cat-btn.active::before, .cat-btn:hover::before { opacity: 1; }
.cat-btn.active, .cat-btn:hover { color: var(--text-1); border-color: rgba(23,143,198,.5); }

/* ══ POSTS GRID ══ */
.main-content { padding: 40px 0 100px; }
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

/* ── Post Card ── */
.post-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
  cursor: pointer;
  display: flex; flex-direction: column;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1), box-shadow .3s;
  box-shadow: var(--shadow-card);
}
/* 旋转彩色光边框 */
.post-card::before {
  content: '';
  position: absolute; inset: -1px; border-radius: inherit; z-index: 0;
  background: conic-gradient(from 0deg, var(--blue), var(--orange), #a855f7, var(--blue));
  opacity: 0; transition: opacity .3s;
  animation: spin-border 3s linear infinite;
}
@keyframes spin-border { to { --angle: 360deg; } }
.post-card:hover::before { opacity: 1; }
.post-card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 24px 48px rgba(0,0,0,.5), var(--shadow-glow);
}
.post-card > * { position: relative; z-index: 1; }
.card-inner { background: var(--bg-card); border-radius: calc(var(--r-xl) - 1px); overflow: hidden; flex:1; display:flex; flex-direction:column; }

.card-cover-wrap { overflow: hidden; aspect-ratio: 16/9; }
.card-cover { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; display: block; }
.post-card:hover .card-cover { transform: scale(1.06); }
.card-cover-placeholder {
  width: 100%; aspect-ratio: 16/9;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
}

.card-body { padding: 22px; flex: 1; display: flex; flex-direction: column; background: var(--bg-card); }
.card-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.card-category {
  font-size: .72rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase;
  padding: 4px 12px; border-radius: 100px;
  background: linear-gradient(135deg, rgba(23,143,198,.25), rgba(23,143,198,.1));
  color: #60c8f0; border: 1px solid rgba(23,143,198,.25);
}
.card-lang {
  font-size: .7rem; color: var(--text-3);
  padding: 3px 8px; border-radius: 6px; border: 1px solid var(--border);
}
.card-title {
  font-size: 1.05rem; font-weight: 700; line-height: 1.4;
  margin-bottom: 10px; color: var(--text-1);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  transition: color .2s;
}
.post-card:hover .card-title { color: #fff; }
.card-excerpt {
  font-size: .875rem; color: var(--text-2); line-height: 1.65;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; flex: 1; margin-bottom: 18px;
}
.card-footer {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .78rem; color: var(--text-3);
  border-top: 1px solid var(--border); padding-top: 14px; margin-top: auto;
}
.card-read {
  display: flex; align-items: center; gap: 5px;
  color: var(--blue); font-weight: 600; font-size: .82rem;
  transition: gap .2s;
}
.post-card:hover .card-read { gap: 8px; }

/* ── Loading ── */
.loading { display: flex; justify-content: center; padding: 80px 0; }
.spinner {
  width: 44px; height: 44px; border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--blue);
  animation: spin .7s linear infinite;
  box-shadow: 0 0 20px var(--blue-glow);
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty { text-align: center; padding: 80px 0; color: var(--text-3); font-size: 1.1rem; }

/* ── Pagination ── */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 48px; }
.page-btn {
  width: 42px; height: 42px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-2); border-radius: var(--r-md);
  cursor: pointer; font-family: inherit; font-size: .9rem;
  transition: all .2s; backdrop-filter: blur(8px);
}
.page-btn.active { background: linear-gradient(135deg, var(--blue), #0ea5e9); color: #fff; border-color: transparent; box-shadow: 0 0 20px var(--blue-glow); }
.page-btn:hover:not(.active) { border-color: var(--border-h); color: var(--text-1); }

/* ══ POST ARTICLE ══ */
.post-main { padding: 0 0 100px; max-width: 820px; }

/* 顶部阅读进度条 */
.progress-bar {
  position: fixed; top: 64px; left: 0; right: 0; height: 3px; z-index: 99;
  background: linear-gradient(90deg, var(--blue), var(--orange));
  transform-origin: left; transform: scaleX(0);
  transition: transform .1s linear;
  box-shadow: 0 0 10px var(--blue-glow);
}

.post-hero {
  position: relative; padding: 48px 0 40px;
  border-bottom: 1px solid var(--border); margin-bottom: 40px;
}
.post-meta-top {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.back-link {
  display: flex; align-items: center; gap: 6px;
  color: var(--text-3); font-size: .875rem; font-weight: 500;
  padding: 6px 14px; border-radius: 100px;
  border: 1px solid var(--border); background: var(--bg-card);
  transition: all .2s;
}
.back-link:hover { color: var(--text-1); border-color: var(--border-h); }
.post-category {
  font-size: .75rem; font-weight: 700; letter-spacing: .05em;
  padding: 5px 14px; border-radius: 100px;
  background: rgba(23,143,198,.15); color: #60c8f0;
  border: 1px solid rgba(23,143,198,.3);
}
.post-title {
  font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 800;
  line-height: 1.25; margin-bottom: 18px; letter-spacing: -.02em;
}
.post-info {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  color: var(--text-3); font-size: .84rem;
}
.post-info-item { display: flex; align-items: center; gap: 5px; }
.post-cover {
  width: 100%; border-radius: var(--r-xl); margin: 32px 0;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}

/* 文章正文排版 */
.post-body { font-size: 1.02rem; line-height: 1.9; color: var(--text-2); }
.post-body h1,.post-body h2,.post-body h3,.post-body h4 { color: var(--text-1); font-weight: 700; margin: 36px 0 14px; line-height: 1.3; }
.post-body h2 { font-size: 1.5rem; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.post-body h3 { font-size: 1.2rem; color: #e2e8f0; }
.post-body p { margin-bottom: 18px; }
.post-body a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; transition: color .2s; }
.post-body a:hover { color: #60c8f0; }
.post-body strong { color: var(--text-1); font-weight: 700; }
.post-body code {
  background: rgba(23,143,198,.12); color: #60c8f0;
  padding: 2px 8px; border-radius: 6px; font-size: .9em;
  border: 1px solid rgba(23,143,198,.2);
}
.post-body pre {
  background: #0a0f1e; border: 1px solid var(--border);
  border-radius: var(--r-md); padding: 20px; overflow-x: auto; margin: 20px 0;
  box-shadow: inset 0 2px 16px rgba(0,0,0,.4);
}
.post-body pre code { background: none; border: none; padding: 0; color: #e2e8f0; }
.post-body ul,.post-body ol { padding-left: 26px; margin-bottom: 18px; }
.post-body li { margin-bottom: 8px; }
.post-body li::marker { color: var(--blue); }
.post-body blockquote {
  border-left: 3px solid var(--blue); padding: 14px 22px; margin: 24px 0;
  background: rgba(23,143,198,.07); border-radius: 0 var(--r-md) var(--r-md) 0;
  color: var(--text-2); font-style: italic;
}
.post-body img { max-width: 100%; border-radius: var(--r-md); margin: 20px 0; box-shadow: 0 8px 32px rgba(0,0,0,.4); }
.post-body table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.post-body th,.post-body td { padding: 12px 16px; border: 1px solid var(--border); font-size: .9rem; }
.post-body th { background: var(--bg-dark); color: var(--text-1); font-weight: 600; }
.post-body td { background: rgba(15,23,42,.4); }
.post-body hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }

/* ── CTA ── */
.post-cta { margin-top: 56px; }
.cta-card {
  position: relative; overflow: hidden;
  border-radius: var(--r-xl); padding: 32px;
  background: linear-gradient(135deg, rgba(23,143,198,.12), rgba(249,115,22,.08));
  border: 1px solid rgba(23,143,198,.25);
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.cta-card::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 300px; height: 300px; border-radius: 50%;
  background: radial-gradient(circle, rgba(249,115,22,.12), transparent 70%);
  pointer-events: none;
}
.cta-icon { font-size: 2.8rem; flex-shrink: 0; }
.cta-content { flex: 1; }
.cta-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 6px; color: var(--text-1); }
.cta-sub { font-size: .9rem; color: var(--text-2); line-height: 1.6; }
.cta-btn {
  flex-shrink: 0; margin-left: auto;
  background: linear-gradient(135deg, var(--blue), var(--orange));
  color: #fff; font-weight: 700; font-size: .95rem;
  padding: 14px 28px; border-radius: 100px; white-space: nowrap;
  box-shadow: 0 8px 24px rgba(23,143,198,.35);
  transition: transform .2s, box-shadow .2s;
  animation: cta-pulse 3s ease-in-out infinite;
}
@keyframes cta-pulse {
  0%,100% { box-shadow: 0 8px 24px rgba(23,143,198,.35); }
  50%      { box-shadow: 0 8px 40px rgba(23,143,198,.6), 0 0 0 6px rgba(23,143,198,.1); }
}
.cta-btn:hover { transform: scale(1.05); box-shadow: 0 12px 36px rgba(23,143,198,.5); }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border); padding: 28px 0;
  color: var(--text-3); font-size: .875rem; position: relative; z-index: 1;
}
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text-2); }
.footer-copy a { color: var(--blue); transition: color .2s; }
.footer-copy a:hover { color: #60c8f0; }

/* ── Back to Top ── */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 99;
  width: 46px; height: 46px; border-radius: 14px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-2); font-size: 1.1rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  opacity: 0; transform: translateY(12px);
  transition: all .3s; pointer-events: none;
}
.back-top.show { opacity: 1; transform: translateY(0); pointer-events: all; }
.back-top:hover { border-color: var(--blue); color: var(--blue); box-shadow: 0 0 20px var(--blue-glow); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .posts-grid { grid-template-columns: 1fr; gap: 16px; }
  .hero { padding: 56px 0 40px; }
  .hero-title { font-size: 2rem; }
  .cta-card { flex-direction: column; text-align: center; }
  .cta-btn { margin-left: 0; width: 100%; text-align: center; }
  .lang-switch { display: none; }
  .post-title { font-size: 1.6rem; }
}

/* ── Animations ── */
.fade-up { opacity: 0; transform: translateY(24px); animation: fadeUp .5s ease forwards; }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }
.fade-up:nth-child(1){animation-delay:.05s}
.fade-up:nth-child(2){animation-delay:.1s}
.fade-up:nth-child(3){animation-delay:.15s}
.fade-up:nth-child(4){animation-delay:.2s}
.fade-up:nth-child(5){animation-delay:.25s}
.fade-up:nth-child(6){animation-delay:.3s}