:root {
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #ffffff;
  --surface-muted: rgba(255, 255, 255, 0.68);
  --text: #132238;
  --muted: #60718a;
  --accent: #0f6fff;
  --accent-strong: #1d4ed8;
  --border: rgba(70, 98, 136, 0.18);
  --ring: rgba(29, 78, 216, 0.18);
  --shadow-soft: 0 18px 40px rgba(23, 47, 83, 0.12);
  --shadow-hover: 0 24px 44px rgba(15, 31, 58, 0.18);
  --max-width: 1100px;
  --radius: 24px;
  --radius-sm: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Avenir Next", "Segoe UI Variable", "PingFang SC", "HarmonyOS Sans SC",
    "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.72;
  background:
    radial-gradient(circle at 12% 12%, rgba(77, 148, 255, 0.16), transparent 28%),
    radial-gradient(circle at 86% 12%, rgba(48, 110, 222, 0.12), transparent 26%),
    linear-gradient(150deg, #f4f8ff 0%, #eef4fb 52%, #f8fbff 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(106, 141, 191, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(106, 141, 191, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at 50% 35%, black 28%, transparent 80%);
  z-index: -1;
}

body.home-page {
  color: #edf4ff;
  background:
    radial-gradient(circle at 50% 18%, rgba(110, 198, 255, 0.18), transparent 24%),
    radial-gradient(circle at 18% 18%, rgba(70, 118, 244, 0.16), transparent 30%),
    radial-gradient(circle at 82% 12%, rgba(32, 67, 133, 0.35), transparent 24%),
    linear-gradient(180deg, #060b14 0%, #0b1322 46%, #0f172a 100%);
}

body.home-page::before {
  background-image:
    linear-gradient(rgba(129, 167, 224, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(129, 167, 224, 0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at 50% 20%, black 32%, transparent 82%);
  opacity: 0.65;
}

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

.container {
  width: min(var(--max-width), calc(100% - 2.4rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px) saturate(160%);
  background: rgba(7, 12, 22, 0.58);
  border-bottom: 1px solid rgba(164, 190, 232, 0.1);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}

.brand-mark {
  font-size: 1rem;
  font-weight: 780;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.topbar-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 62px;
  padding: 0.48rem 0.86rem;
  border-radius: 999px;
  border: 1px solid rgba(146, 181, 228, 0.16);
  background: rgba(12, 19, 34, 0.56);
  color: rgba(232, 239, 251, 0.82);
  font-size: 0.86rem;
  font-weight: 650;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.topbar-pill:hover {
  transform: translateY(-1px);
  border-color: rgba(125, 211, 252, 0.34);
  background: rgba(18, 31, 55, 0.72);
}

.topbar-pill.accent {
  background: linear-gradient(135deg, rgba(20, 87, 214, 0.92), rgba(56, 189, 248, 0.92));
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 12px 28px rgba(33, 97, 214, 0.24);
}

.card-home {
  width: min(680px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4.75rem 0 3rem;
}

.intro-shell,
.meta-item,
.entry-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(151, 181, 224, 0.12);
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.84), rgba(8, 14, 27, 0.92));
  box-shadow: 0 26px 60px rgba(4, 10, 21, 0.48);
}

.intro-shell::before,
.meta-item::before,
.entry-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(125, 211, 252, 0.08), transparent 40%, rgba(59, 130, 246, 0.05));
}

.intro-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border-radius: 34px;
  padding: 2.4rem 1.6rem 1.6rem;
}

.avatar-orb {
  width: 120px;
  height: 120px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 50%;
  padding: 4px;
  border: 1px solid rgba(148, 197, 255, 0.2);
  background: linear-gradient(160deg, rgba(125, 211, 252, 0.45), rgba(29, 78, 216, 0.28));
  box-shadow:
    inset 0 1px 18px rgba(255, 255, 255, 0.08),
    0 24px 40px rgba(7, 13, 25, 0.48);
}

.avatar-photo {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  border-radius: 50%;
  background: #0f172a;
}

.intro-kicker {
  margin: 1.05rem 0 0;
  font-size: 0.78rem;
  font-weight: 780;
  letter-spacing: 0.26em;
  color: #7dd3fc;
  text-transform: uppercase;
}

.intro-shell h1 {
  margin: 0.72rem 0 0;
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  line-height: 1.06;
  letter-spacing: 0.02em;
}

.intro-alias {
  margin: 0.75rem 0 0;
  color: rgba(222, 233, 249, 0.74);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.intro-summary {
  margin: 1rem 0 0;
  max-width: 34rem;
  color: rgba(214, 225, 243, 0.76);
  font-size: 0.98rem;
}

.intro-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.intro-tags span {
  padding: 0.42rem 0.78rem;
  border-radius: 999px;
  border: 1px solid rgba(147, 197, 253, 0.16);
  background: rgba(14, 24, 43, 0.72);
  color: rgba(227, 237, 252, 0.78);
  font-size: 0.82rem;
  font-weight: 640;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1.25rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 104px;
  padding: 1rem 1rem 0.95rem;
  border-radius: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

a.meta-item:hover {
  transform: translateY(-2px);
  border-color: rgba(125, 211, 252, 0.3);
  background: linear-gradient(180deg, rgba(17, 28, 50, 0.9), rgba(10, 17, 30, 0.96));
}

.meta-label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(125, 211, 252, 0.82);
}

.meta-item strong {
  margin-top: 0.46rem;
  font-size: 1rem;
  line-height: 1.45;
  color: #f7fbff;
}

.entry-list {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.35rem;
}

.entry-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  border-radius: 26px;
  padding: 1.02rem 1.08rem;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.entry-card:hover {
  transform: translateY(-2px);
  border-color: rgba(125, 211, 252, 0.36);
  box-shadow: 0 30px 62px rgba(2, 9, 20, 0.56);
}

.entry-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: rgba(12, 20, 35, 0.88);
  border: 1px solid rgba(148, 196, 255, 0.14);
  color: #8dd7ff;
  font-weight: 760;
  letter-spacing: 0.08em;
}

.entry-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.entry-copy strong {
  font-size: 1.02rem;
  line-height: 1.32;
  color: #f8fbff;
}

.entry-copy span {
  margin-top: 0.22rem;
  color: rgba(210, 222, 241, 0.7);
  font-size: 0.9rem;
}

.entry-arrow {
  font-size: 1.3rem;
  color: rgba(171, 206, 251, 0.76);
  transition: transform 0.2s ease, color 0.2s ease;
}

.entry-card:hover .entry-arrow {
  transform: translate(2px, -2px);
  color: #e0f2fe;
}

.site-footer {
  margin-top: 1.8rem;
  border-top: 1px solid var(--border);
  background: rgba(236, 242, 251, 0.72);
}

.home-page .site-footer {
  border-top-color: rgba(148, 181, 230, 0.1);
  background: rgba(4, 9, 18, 0.42);
}

.footer-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.footer-inner p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.home-page .footer-inner p,
.home-page .footer-inner a {
  color: rgba(197, 211, 235, 0.58);
}

.footer-inner a {
  color: var(--accent-strong);
}

/* 文章页 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px) saturate(150%);
  background: rgba(240, 247, 255, 0.78);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 68px;
  gap: 1rem;
}

.brand {
  font-size: 1.03rem;
  font-weight: 760;
  letter-spacing: 0.025em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.55rem;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 620;
  padding: 0.35rem 0.78rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.site-nav a:hover {
  color: var(--accent-strong);
  border-color: var(--ring);
  background: rgba(29, 78, 216, 0.06);
}

.site-nav .external-link {
  color: #ffffff;
  border-color: transparent;
  background: linear-gradient(125deg, var(--accent), var(--accent-strong));
  box-shadow: 0 10px 18px rgba(29, 78, 216, 0.22);
}

.site-nav .external-link:hover {
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 14px 22px rgba(29, 78, 216, 0.28);
}

.post-page {
  margin: 1.8rem auto;
  width: min(860px, calc(100% - 2.4rem));
}

.post-layout {
  position: relative;
  overflow: hidden;
  padding: 1.8rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.88), rgba(246, 250, 255, 0.76));
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(6px);
}

.post-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.tag {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 780;
  letter-spacing: 0.16em;
  color: var(--accent-strong);
  text-transform: uppercase;
}

.post-layout h1 {
  margin: 0.45rem 0 0.9rem;
  line-height: 1.3;
  font-size: clamp(1.55rem, 2.7vw, 2.2rem);
}

.post-content h2 {
  margin-top: 1.72rem;
  margin-bottom: 0.54rem;
  font-size: 1.2rem;
}

.post-content p {
  margin: 0.62rem 0;
}

.post-content ul,
.post-content ol {
  margin: 0.6rem 0;
  padding-left: 1.25rem;
}

.post-content li {
  margin: 0.35rem 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 1rem;
  color: var(--accent-strong);
  font-weight: 700;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 60;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, #0f6fff, #38bdf8, #1d4ed8);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.56s ease, transform 0.56s ease;
}

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

@media (max-width: 768px) {
  .container,
  .post-page {
    width: min(100%, calc(100% - 1.4rem));
  }

  .topbar-inner {
    min-height: 60px;
  }

  .card-home {
    width: min(100%, calc(100% - 1.2rem));
    padding-top: 3.6rem;
  }

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

  .entry-card {
    grid-template-columns: 1fr auto;
    gap: 0.9rem;
  }

  .entry-icon {
    display: none;
  }

  .header-inner {
    align-items: flex-start;
    min-height: 58px;
    padding-top: 0.55rem;
    padding-bottom: 0.55rem;
  }
}

@media (max-width: 540px) {
  .brand-mark {
    font-size: 0.88rem;
    letter-spacing: 0.1em;
  }

  .topbar-actions {
    gap: 0.45rem;
  }

  .topbar-pill {
    min-width: 54px;
    padding: 0.42rem 0.72rem;
  }

  .intro-shell {
    padding: 1.5rem 0.92rem 1rem;
    border-radius: 28px;
  }

  .avatar-orb {
    width: 96px;
    height: 96px;
  }

  .intro-shell h1 {
    font-size: 2rem;
  }

  .intro-summary {
    font-size: 0.9rem;
  }

  .intro-tags {
    gap: 0.45rem;
    margin-top: 1rem;
  }

  .meta-item {
    min-height: 82px;
    padding: 0.88rem;
  }

  .entry-card {
    padding: 0.84rem 0.9rem;
    border-radius: 22px;
  }

  .entry-copy strong {
    font-size: 0.98rem;
  }

  .entry-copy span {
    font-size: 0.86rem;
  }

  .brand {
    font-size: 0.95rem;
  }

  .site-nav {
    gap: 0.4rem;
  }

  .site-nav a {
    font-size: 0.83rem;
    padding: 0.3rem 0.6rem;
  }

  .post-layout {
    padding: 1.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .topbar-pill,
  .meta-item,
  .entry-card,
  .entry-arrow,
  .site-nav a,
  .site-nav .external-link,
  .reveal,
  .reveal.visible {
    transition: none;
    transform: none;
  }

  .reveal,
  .reveal.visible {
    opacity: 1;
  }
}