/* =========================================================
   阿岚的小站 — 样式表
   想换配色，只改下面 :root 里的变量就够了。
   ========================================================= */

:root {
  --bg: #faf8f5;
  --surface: #fffdfa;
  --surface-2: #f3efe9;
  --ink: #1b1916;
  --ink-2: #57514a;
  --ink-3: #8a8378;
  --line: #e4ddd3;
  --accent: #b45309;
  --accent-2: #8a3f06;
  --accent-soft: rgba(180, 83, 9, 0.10);
  --on-accent: #fffdfa;
  --shadow: 0 1px 2px rgba(27, 25, 22, 0.04), 0 8px 24px rgba(27, 25, 22, 0.05);
  --radius: 16px;
  --measure: 680px;
  --wide: 960px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131211;
    --surface: #1a1817;
    --surface-2: #211e1c;
    --ink: #eee9e1;
    --ink-2: #b3aa9e;
    --ink-3: #8b8377;
    --line: #2e2a27;
    --accent: #f0b429;
    --accent-2: #ffd27a;
    --accent-soft: rgba(240, 180, 41, 0.12);
    --on-accent: #1a1205;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

/* ---------- 基础 ---------- */

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

::selection { background: var(--accent-soft); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

code, kbd {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.1em 0.38em;
}

pre {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 0.85em;
  line-height: 1.65;
}

pre code { background: none; border: 0; padding: 0; font-size: 1em; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 99;
  background: var(--accent);
  color: var(--on-accent);
  padding: 8px 14px;
  border-radius: 8px;
}
.skip-link:focus { left: 16px; color: var(--on-accent); }

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 16px 28px;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 65%, transparent);
}

.brand {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.brand:hover { color: var(--ink); }
.brand-dot { color: var(--accent); }

.nav { display: flex; gap: 22px; }

.nav a {
  position: relative;
  padding: 4px 0;
  font-size: 0.93rem;
  color: var(--ink-2);
  transition: color 0.18s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--accent); }
.nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

/* ---------- 主体 ---------- */

main {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 28px;
}

main.narrow { max-width: calc(var(--measure) + 56px); }

.hero {
  max-width: var(--measure);
  padding: clamp(48px, 9vw, 92px) 0 clamp(32px, 5vw, 44px);
}

.eyebrow {
  margin: 0 0 20px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6.2vw, 3.3rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 700;
  text-wrap: balance;
}

.lede {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: 1.04rem;
  color: var(--ink-2);
  text-wrap: pretty;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 0.92rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}
.btn:hover { color: var(--on-accent); opacity: 0.9; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-3); }

/* ---------- 区块 ---------- */

.section {
  max-width: var(--measure);
  padding: clamp(28px, 5vw, 42px) 0;
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}

h2 {
  margin: 0;
  font-size: 1.14rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.hint {
  font-size: 0.78rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* ---------- 文章列表 ---------- */

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

.post-item {
  display: block;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.post-list li:last-child .post-item { border-bottom: 0; padding-bottom: 0; }

.post-item time {
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.post-item h3 {
  margin: 6px 0 4px;
  font-size: 1.06rem;
  font-weight: 650;
  line-height: 1.45;
  color: var(--ink);
  transition: color 0.18s var(--ease);
}

.post-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ink-2);
}

.post-item:hover h3,
.post-item:focus-visible h3 { color: var(--accent); }

/* ---------- 卡片 ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 6px;
  font-size: 0.97rem;
  font-weight: 650;
}

.card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.65;
  color: var(--ink-2);
}

/* ---------- 正文页 ---------- */

.prose { padding: clamp(36px, 6vw, 60px) 0 32px; }

.back {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: var(--ink-3);
}
.back:hover { color: var(--accent); }

.prose h1 {
  font-size: clamp(1.7rem, 4.6vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.post-meta {
  margin: 12px 0 0;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.prose h2 {
  margin: 44px 0 12px;
  font-size: 1.3rem;
  line-height: 1.4;
}

.prose h3 {
  margin: 30px 0 8px;
  font-size: 1.08rem;
}

.prose p { margin: 0 0 18px; }

.prose ul, .prose ol { margin: 0 0 18px; padding-left: 1.4em; }
.prose li { margin: 6px 0; }

.prose blockquote {
  margin: 28px 0;
  padding: 2px 0 2px 20px;
  border-left: 3px solid var(--accent);
  color: var(--ink-2);
  font-size: 1.02rem;
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose img {
  margin: 26px 0;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.prose a {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--accent); }

.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}

/* ---------- 404 ---------- */

.notfound {
  min-height: 62vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  max-width: var(--measure);
  padding: 60px 0;
}

/* ---------- 页脚 ---------- */

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 34px 28px 48px;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--ink-3);
}

.site-footer p { margin: 0; }

.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--ink-2); }
.footer-links a:hover { color: var(--accent); }

/* ---------- 小屏 ---------- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .site-header { padding: 14px 18px; gap: 14px; }
  .nav { gap: 16px; }
  main { padding: 0 18px; }
  .site-footer { padding: 28px 18px 40px; }
  .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 40px; }
}