:root {
  --bg: #ffffff;
  --bg-blur: rgba(255, 255, 255, 0.72);
  --bg-soft: #f5f5f7;
  --fg: #1d1d1f;
  --fg-soft: #6e6e73;
  --border: rgba(0, 0, 0, 0.09);
  --accent: #4a4fd4;
  --on-accent: #ffffff;
  --code-bg: #f5f5f7;
  --glow: rgba(74, 79, 212, 0.11);
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lift: 0 16px 36px rgba(0, 0, 0, 0.1);
  --radius: 20px;
  --maxw: 66rem;
  --readw: 43rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0d;
    --bg-blur: rgba(11, 11, 13, 0.72);
    --bg-soft: #151517;
    --fg: #f5f5f7;
    --fg-soft: #a1a1a6;
    --border: rgba(255, 255, 255, 0.11);
    --accent: #a8abff;
    --on-accent: #0b0b0d;
    --code-bg: #17171a;
    --glow: rgba(130, 134, 255, 0.16);
    --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-lift: 0 18px 44px rgba(0, 0, 0, 0.5);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.wrap-narrow {
  max-width: var(--readw);
}

a {
  color: var(--accent);
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- 吸顶导航 ---------- */

header.site {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-blur);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.4rem;
}

.brand {
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
}

nav.site {
  display: flex;
  gap: 1.6rem;
}

nav.site a {
  color: var(--fg-soft);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

nav.site a:hover,
nav.site a[aria-current="page"] {
  color: var(--fg);
}

/* ---------- 首屏 ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 7.5rem 0 6.5rem;
  text-align: center;
}

.hero::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -60%;
  width: 140%;
  height: 160%;
  transform: translateX(-50%);
  background: radial-gradient(38% 46% at 50% 50%, var(--glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero .wrap {
  position: relative;
}

.hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2.6rem, 8vw, 4.75rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.hero-sub {
  margin: 0 auto;
  max-width: 34rem;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  color: var(--fg-soft);
}

/* ---------- 分区 ---------- */

.band {
  padding: 5rem 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section {
  padding: 5rem 0;
}

.section-title {
  margin: 0 0 1.9rem;
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.cards + .section-title {
  margin-top: 3.5rem;
}

/* ---------- 入口卡片 ---------- */

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1.1rem;
}

.cards > li {
  display: flex;
}

.card {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  width: 100%;
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: var(--shadow-soft);
  color: inherit;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.3, 1), box-shadow 0.3s ease,
    border-color 0.3s ease;
}

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

a.card:hover .card-title {
  color: var(--accent);
}

.card-monogram {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 2.9rem;
  height: 2.9rem;
  border-radius: 15px;
  background: var(--accent);
  background: linear-gradient(
    140deg,
    var(--accent),
    color-mix(in srgb, var(--accent) 52%, var(--bg))
  );
  color: var(--on-accent);
  font-size: 1.15rem;
  font-weight: 600;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.card-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.06rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
}

.card-desc {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--fg-soft);
}

.badge {
  padding: 0.12rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--fg-soft);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.badge-live {
  color: var(--accent);
}

.card.is-pending {
  opacity: 0.6;
  box-shadow: none;
}

/* ---------- 文章列表 ---------- */

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list li:first-child {
  padding-top: 0;
}

.post-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.post-list time {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.82rem;
  color: var(--fg-soft);
  font-variant-numeric: tabular-nums;
}

.post-list a.title {
  display: inline-block;
  font-size: clamp(1.15rem, 2.4vw, 1.42rem);
  font-weight: 600;
  letter-spacing: -0.018em;
  color: var(--fg);
  transition: color 0.2s ease;
}

.post-list a.title:hover {
  color: var(--accent);
}

.post-list p {
  max-width: 46rem;
  margin: 0.45rem 0 0;
  font-size: 0.95rem;
  color: var(--fg-soft);
}

/* ---------- 文章页 ---------- */

.back {
  margin: 0 0 2.5rem;
  font-size: 0.9rem;
}

.back a {
  color: var(--fg-soft);
  transition: color 0.2s ease;
}

.back a:hover {
  color: var(--accent);
}

article h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(2rem, 5.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

article .meta {
  margin: 0 0 3rem;
  font-size: 0.88rem;
  color: var(--fg-soft);
  font-variant-numeric: tabular-nums;
}

article p {
  margin: 1.3rem 0;
  font-size: 1.06rem;
  line-height: 1.8;
}

article h2 {
  margin: 3rem 0 1rem;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

article h3 {
  margin: 2.2rem 0 0.8rem;
  font-size: 1.2rem;
  font-weight: 600;
}

article a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

article ul,
article ol {
  padding-left: 1.4rem;
}

article li {
  margin: 0.5rem 0;
  font-size: 1.06rem;
}

article img {
  max-width: 100%;
  height: auto;
  border-radius: 14px;
}

article blockquote {
  margin: 2rem 0;
  padding: 0.3rem 0 0.3rem 1.3rem;
  border-left: 3px solid var(--border);
  color: var(--fg-soft);
}

article code {
  padding: 0.15em 0.4em;
  border-radius: 6px;
  background: var(--code-bg);
  font-size: 0.88em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

article pre {
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--code-bg);
  overflow-x: auto;
}

article pre code {
  padding: 0;
  background: none;
  font-size: 0.88rem;
  line-height: 1.7;
}

article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.98rem;
}

article th,
article td {
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

article hr {
  margin: 3rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

/* ---------- 页脚 ---------- */

footer.site {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--fg-soft);
}

/* ---------- 入场动效 ---------- */

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero h1,
  .hero-sub {
    animation: rise 0.9s cubic-bezier(0.2, 0.7, 0.3, 1) both;
  }
  .hero-sub {
    animation-delay: 0.1s;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }
  .hero {
    padding: 5rem 0 4rem;
  }
  .band,
  .section {
    padding: 3.5rem 0;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .card {
    padding: 1.35rem;
  }
}