/* ---------- tokens ---------- */
:root {
  --cream: #f7f5ee;
  --g-deep: #12603e;
  --g-mid: #34aa70;
  --g-soft: #7ecd9e;
  --radius: 18px;
  --wrap: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC",
    "Helvetica Neue", "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
:root,
[data-theme="light"] {
  --bg: var(--cream);
  --bg-alt: #efece1;
  --surface: #fffefb;
  --line: rgba(18, 96, 62, 0.14);
  --text: #10231a;
  --subtle: #55665d;
  --accent: var(--g-deep);
  --accent-ink: #ffffff;
  --chip: rgba(18, 96, 62, 0.08);
  --shadow: 0 1px 2px rgba(16, 35, 26, 0.05), 0 18px 40px -22px rgba(16, 60, 40, 0.35);
}
[data-theme="dark"] {
  --bg: #0d1512;
  --bg-alt: #101a16;
  --surface: #16221d;
  --line: rgba(126, 205, 158, 0.16);
  --text: #e9f1ec;
  --subtle: #93a69c;
  --accent: #4fbe82;
  --accent-ink: #06170f;
  --chip: rgba(126, 205, 158, 0.12);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 22px 46px -24px rgba(0, 0, 0, 0.8);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #0d1512;
    --bg-alt: #101a16;
    --surface: #16221d;
    --line: rgba(126, 205, 158, 0.16);
    --text: #e9f1ec;
    --subtle: #93a69c;
    --accent: #4fbe82;
    --accent-ink: #06170f;
    --chip: rgba(126, 205, 158, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 22px 46px -24px rgba(0, 0, 0, 0.8);
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -0.02em; margin: 0 0 0.4em; }
h1 { font-size: clamp(2rem, 4.7vw, 3.15rem); font-weight: 800; }
h1 span { display: block; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); font-weight: 750; }
h3 { font-size: 1.06rem; font-weight: 680; }
p { margin: 0 0 1em; }
strong { font-weight: 680; }
code, pre, kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}
code {
  background: var(--chip);
  border-radius: 6px;
  padding: 0.12em 0.4em;
  word-break: break-word;
}
kbd {
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0.05em 0.42em;
  background: var(--surface);
}
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 22px; }
/* 栅格轨道是 minmax(auto, 1fr)：里面只要有一个 pre / 长 code 就会把列撑宽，
   小屏上整页横向溢出。min-width: 0 让子项可以收缩，宽内容改由 pre 自己横向滚。*/
.hero-grid > *, .grid > *, .steps > *, .split > *, .diagram > *, .dg-col > *, .table > * { min-width: 0; }
.wrap.narrow { max-width: 780px; }
.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 0 0 10px 0; z-index: 99;
}
.skip:focus { left: 0; }

section { padding: 84px 0; }
section.alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section-lede { color: var(--subtle); max-width: 62ch; font-size: 1.05rem; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; gap: 18px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 750; text-decoration: none; letter-spacing: -0.01em; }
.brand img { border-radius: 8px; }
.nav { margin-left: auto; display: flex; gap: 4px; }
.nav a {
  text-decoration: none; color: var(--subtle); font-size: 0.94rem;
  padding: 7px 12px; border-radius: 9px; transition: color .18s, background .18s;
}
.nav a:hover { color: var(--text); background: var(--chip); }
.ghost {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--line); background: transparent; color: var(--subtle);
  border-radius: 10px; padding: 6px 11px; font: inherit; font-size: 0.86rem; cursor: pointer;
}
.ghost:hover { color: var(--text); border-color: var(--accent); }
.theme-icon::before { content: "◐"; }
[data-theme="dark"] .theme-icon::before { content: "☾"; }
[data-theme="light"] .theme-icon::before { content: "☀"; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 20px; border-radius: 12px; text-decoration: none;
  font-weight: 620; font-size: 0.97rem; border: 1px solid var(--line);
  background: var(--surface); color: var(--text);
  transition: transform .16s, box-shadow .16s, border-color .16s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--accent); }
.btn.primary {
  background: linear-gradient(160deg, var(--g-mid), var(--g-deep));
  color: #fff; border-color: transparent;
  box-shadow: 0 10px 24px -12px rgba(18, 96, 62, 0.75);
}
[data-theme="dark"] .btn.primary { color: #06170f; }

/* ---------- hero ---------- */
.hero { padding: 92px 0 76px; }
.hero-grid {
  display: grid; grid-template-columns: 1.12fr 0.88fr;
  gap: 48px; align-items: center;
}
.eyebrow {
  font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.16em;
  color: var(--accent); margin-bottom: 18px; font-weight: 600;
}
.lede { color: var(--subtle); font-size: 1.1rem; max-width: 52ch; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 26px 0 22px; }
.hero-facts { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 18px; padding: 0; margin: 0; font-size: 0.9rem; color: var(--subtle); }
.hero-facts li { display: flex; align-items: center; gap: 7px; }
.hero-facts li::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }

/* ---------- hero screenshot ---------- */
.shot { margin: 0; }
.shot-frame {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 20px; box-shadow: var(--shadow); overflow: hidden;
}
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption {
  margin-top: 12px; font-size: 0.79rem; color: var(--subtle);
  line-height: 1.6; text-align: center;
}
.shot figcaption code { font-size: 0.76rem; }

/* ---------- strip ---------- */
.strip { padding: 0; }
.strip-inner {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap; justify-content: center;
  padding-block: 26px; border-block: 1px solid var(--line); background: var(--surface);
}
.strip-step { display: flex; align-items: center; gap: 10px; font-size: 0.95rem; }
.strip-step b {
  width: 25px; height: 25px; border-radius: 8px; display: grid; place-items: center;
  background: var(--chip); color: var(--accent); font-size: 0.82rem; font-family: var(--mono);
}
.strip-arrow { color: var(--subtle); opacity: 0.6; }

/* ---------- grids ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 34px; }
.grid.tight { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.card h3 { margin-bottom: 6px; }
.card p { margin: 0; color: var(--subtle); font-size: 0.94rem; }

/* ---------- steps ---------- */
.steps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 34px; align-items: start; }
.step {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px;
}
.step-no {
  font-family: var(--mono); font-size: 0.78rem; color: var(--accent);
  letter-spacing: 0.1em; display: block; margin-bottom: 10px;
}
.step p { color: var(--subtle); font-size: 0.95rem; margin-bottom: 0; }
.step pre {
  margin: 14px 0 0; padding: 13px 15px; border-radius: 12px;
  background: var(--bg-alt); border: 1px solid var(--line); overflow-x: auto;
}
.step pre code { background: none; padding: 0; font-size: 0.84rem; }

/* ---------- diagram ---------- */
.diagram {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px;
  align-items: center; margin: 34px 0 44px;
}
.dg-col { display: grid; gap: 14px; }
.node {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 14px; padding: 15px 17px; box-shadow: var(--shadow);
}
.node b { display: block; font-size: 0.98rem; }
.node span { font-size: 0.8rem; color: var(--subtle); }
.node.ext { border-left: 3px solid var(--g-mid); }
.node.app { border-left: 3px solid var(--g-deep); }
.node.core { border-right: 3px solid var(--g-mid); }
.node.db { border-right: 3px solid var(--g-deep); }
.node.secret { border-right: 3px solid var(--g-soft); }
.node.more { opacity: 0.72; border-style: dashed; }
.dg-mid { display: grid; gap: 26px; }
.wire {
  font-family: var(--mono); font-size: 0.72rem; color: var(--subtle);
  white-space: nowrap; padding-inline: 6px;
  border-top: 1px dashed var(--line);
}
.wire::before { content: "⇄ "; color: var(--accent); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.api { list-style: none; padding: 0; margin: 0 0 14px; display: grid; gap: 7px; }
.api li code { background: var(--bg-alt); border: 1px solid var(--line); padding: 0.2em 0.5em; display: inline-block; }
section p.note { margin-top: 26px; font-size: 0.86rem; color: var(--subtle); }

/* ---------- table ---------- */
.table { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin-top: 30px; background: var(--surface); }
.tr { display: grid; grid-template-columns: 190px 130px 1fr; gap: 14px; padding: 15px 20px; border-top: 1px solid var(--line); align-items: center; font-size: 0.94rem; }
.tr:first-child { border-top: 0; }
.tr.th { background: var(--bg-alt); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--subtle); font-family: var(--mono); }
.pill { display: inline-block; font-size: 0.76rem; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); }
.pill.ok { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); background: var(--chip); }
.pill.wip { color: var(--subtle); }

/* ---------- faq ---------- */
details {
  border-bottom: 1px solid var(--line); padding: 4px 0;
}
summary {
  cursor: pointer; font-weight: 640; padding: 16px 34px 16px 0; position: relative; list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  color: var(--accent); font-size: 1.2rem; font-weight: 400;
}
details[open] summary::after { content: "–"; }
details p { color: var(--subtle); font-size: 0.96rem; padding-bottom: 16px; margin: 0; }

/* ---------- closing ---------- */
.closing { text-align: center; }
.closing-inner { display: grid; justify-items: center; gap: 4px; }
.closing img { border-radius: 12px; margin-bottom: 14px; }
.closing p { color: var(--subtle); max-width: 46ch; margin-bottom: 22px; }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); padding: 26px 0 40px; background: var(--bg-alt); }
.foot-inner { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; font-size: 0.85rem; color: var(--subtle); }
.foot-links a { text-decoration: none; }
.foot-links a:hover { color: var(--accent); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .55s ease, transform .55s ease; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal.in { opacity: 1; transform: none; transition: none; }
  .card:hover, .btn:hover { transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid, .grid.tight, .steps { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 26px; }
  .diagram { grid-template-columns: 1fr; }
  .dg-mid { grid-auto-flow: column; justify-content: start; gap: 14px; }
  .nav { display: none; }
  section { padding: 64px 0; }
}
@media (max-width: 620px) {
  .grid, .grid.tight, .steps { grid-template-columns: 1fr; }
  .tr { grid-template-columns: 1fr; gap: 4px; }
  .tr.th { display: none; }
  .word { font-size: 1.55rem; }
  .strip-arrow { display: none; }
  .strip-inner { justify-content: flex-start; }
}

/* ---------- 顶栏图标链接 / 作者区块 ---------- */
.icon-link {
  display: inline-grid; place-items: center; width: 34px; height: 34px;
  border-radius: 10px; border: 1px solid var(--line); color: var(--subtle);
  transition: color .18s, border-color .18s;
}
.icon-link:hover { color: var(--text); border-color: var(--accent); }

.author {
  display: flex; gap: 24px; align-items: flex-start; max-width: 780px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); margin-top: 30px;
}
.author-avatar {
  width: 84px; height: 84px; border-radius: 20px; object-fit: cover;
  flex: none; border: 1px solid var(--line);
}
.author-name { font-size: 1.16rem; font-weight: 720; letter-spacing: -0.01em; margin: 0 0 2px; }
.author-handle { font-family: var(--mono); font-size: 0.8rem; font-weight: 500; color: var(--accent); margin-left: 9px; }
.author-bio { color: var(--subtle); font-size: 0.92rem; margin: 0 0 12px; }
.author-links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

.foot a { color: inherit; }
.foot-links a + a { margin-left: 16px; }
.closing { border-top: 1px solid var(--line); }

@media (max-width: 620px) {
  .author { flex-direction: column; gap: 16px; padding: 20px; }
}