/* ============================================================
   xPoster website
   ============================================================ */
:root {
  --ink: #20231f;
  --paper: #fbfaf6;
  --g1: #f3f0e8;
  --g2: #e7e1d5;
  --g3: #d5ccbc;
  --g4: #a69b89;
  --g5: #746c60;
  --g6: #3f423b;
  --line: #b9ad9a;
  --hair: #ded6ca;
  --panel: #30352f;
  --on-panel: #f8f5ee;
  --accent: #6f7f68;
  --accent-soft: #dfe7d9;
  --shadow: 0 18px 42px rgba(68, 60, 45, .08);
  --shadow-lift: 0 22px 54px rgba(68, 60, 45, .13);
  --ease-out-quart: cubic-bezier(.25, 1, .5, 1);
  --ease-out-quint: cubic-bezier(.22, 1, .36, 1);
  --motion-fast: 140ms;
  --motion-med: 240ms;
  --motion-slow: 420ms;
  --wrap: 1180px;
  --pad: 28px;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", "Menlo", "Consolas", "Liberation Mono", monospace;
}

:root { color-scheme: light; }

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #ece8df;
  --paper: #141610;
  --g1: #1d2119;
  --g2: #2a2d24;
  --g3: #3a3b31;
  --g4: #958d7f;
  --g5: #b4aa99;
  --g6: #d6d0c4;
  --line: #514d43;
  --hair: #34362e;
  --panel: #20251e;
  --on-panel: #f4efe5;
  --accent: #9aaa8e;
  --accent-soft: #2c3529;
  --shadow: 0 18px 42px rgba(0, 0, 0, .26);
}
/* keep QR codes scannable on dark backgrounds */
:root[data-theme="dark"] .support-qr img { background: #fff; filter: grayscale(1) contrast(1.1); }
:root[data-theme="dark"] .hero-shot img { filter: saturate(.76) contrast(1.02) brightness(.94); }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { overflow-x: hidden; }
body { transition: background-color var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart); }
body {
  margin: 0;
  background:
    radial-gradient(circle at 18% 0%, color-mix(in srgb, var(--accent-soft) 54%, transparent) 0 280px, transparent 520px),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--ink); color: var(--paper); }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding-inline: var(--pad); }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 10px 16px; font: 600 13px/1 var(--mono);
}
.skip:focus { left: 12px; top: 12px; }

/* ---------- buttons ---------- */
.solid-btn, .ghost-btn {
  position: relative; overflow: hidden; isolation: isolate;
  display: inline-flex; align-items: center; justify-content: center;
  font: 600 13px/1 var(--mono); letter-spacing: .03em; text-transform: uppercase;
  padding: 11px 18px; border: 1px solid var(--line);
  cursor: pointer; transition:
    background-color var(--motion-med) var(--ease-out-quart),
    color var(--motion-med) var(--ease-out-quart),
    border-color var(--motion-med) var(--ease-out-quart),
    box-shadow var(--motion-med) var(--ease-out-quart),
    transform var(--motion-med) var(--ease-out-quart);
  white-space: nowrap;
}
.solid-btn::before, .ghost-btn::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(105deg, transparent 0 28%, color-mix(in srgb, var(--on-panel) 22%, transparent) 42%, transparent 58% 100%);
  transform: translateX(-120%) skewX(-16deg);
  transition: transform var(--motion-slow) var(--ease-out-quint);
}
.solid-btn { background: var(--panel); color: var(--on-panel); border-color: var(--panel); }
.solid-btn:hover { background: var(--accent); color: var(--paper); border-color: var(--accent); box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 20%, transparent); transform: translateY(-2px); }
.ghost-btn { background: var(--paper); color: var(--ink); }
.ghost-btn::before { background: linear-gradient(105deg, transparent 0 28%, color-mix(in srgb, var(--accent) 18%, transparent) 42%, transparent 58% 100%); }
.ghost-btn:hover { background: var(--accent-soft); color: var(--ink); border-color: var(--accent); box-shadow: 0 10px 22px color-mix(in srgb, var(--accent) 15%, transparent); transform: translateY(-2px); }
.solid-btn:hover::before, .ghost-btn:hover::before { transform: translateX(120%) skewX(-16deg); }
.solid-btn:active, .ghost-btn:active, .chip:active, .icon-toggle:active, .lang-toggle:active { transform: translateY(0) scale(.985); }
.solid-btn.lg, .ghost-btn.lg { padding: 15px 26px; font-size: 14px; }
.ghost-btn.wide { padding: 14px 40px; }

/* ---------- header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  border-bottom: 1px solid var(--hair);
  backdrop-filter: blur(16px);
}
.head-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 26px; height: 26px; display: block; transition: transform var(--motion-med) var(--ease-out-quart), filter var(--motion-med) var(--ease-out-quart); }
.brand:hover .brand-mark { transform: translateY(-1px) rotate(-3deg); filter: drop-shadow(0 6px 12px color-mix(in srgb, var(--ink) 16%, transparent)); }
.brand-word { transition: color var(--motion-med) var(--ease-out-quart); }
.brand:hover .brand-word { color: var(--accent); }
.brand-mark rect { fill: var(--ink); }
.brand-mark path { stroke: var(--paper); }
.brand-word { font: 800 19px/1 var(--sans); letter-spacing: -.01em; }
.head-nav { display: flex; gap: 22px; margin-left: 8px; }
.head-nav a {
  position: relative;
  font: 600 13px/1 var(--mono); letter-spacing: .02em; text-transform: uppercase;
  color: var(--g5); padding: 6px 0;
  transition: color var(--motion-med) var(--ease-out-quart);
}
.head-nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: 0 50%;
  transition: transform var(--motion-med) var(--ease-out-quart);
}
.head-nav a:hover { color: var(--ink); }
.head-nav a:hover::after { transform: scaleX(1); }
.head-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.lang-toggle {
  transition: background-color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart);
  font: 600 12px/1 var(--mono); background: var(--paper); color: var(--g4);
  border: 1px solid var(--line); padding: 9px 11px; cursor: pointer;
  letter-spacing: .04em;
}
.lang-toggle:hover { background: var(--accent-soft); border-color: var(--accent); transform: translateY(-1px); }
.lang-toggle .lang-sep { margin: 0 3px; color: var(--g3); }
.lang-toggle .lang-en, .lang-toggle .lang-zh { transition: color .12s; }
body[data-lang="en"] .lang-toggle .lang-en { color: var(--ink); }
body[data-lang="zh"] .lang-toggle .lang-zh { color: var(--ink); }
.head-actions .ghost-btn, .head-actions .solid-btn { padding: 9px 14px; }
.icon-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 36px; padding: 0; cursor: pointer;
  background: var(--paper); color: var(--ink); border: 1px solid var(--line);
  transition: background-color var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart);
}
.icon-toggle:hover { background: var(--accent-soft); border-color: var(--accent); transform: translateY(-1px); }
.icon-toggle svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform var(--motion-med) var(--ease-out-quart); }
.icon-toggle:hover svg { transform: rotate(-12deg) scale(1.04); }
.icon-toggle .i-sun { display: none; }
:root[data-theme="dark"] .icon-toggle .i-sun { display: block; }
:root[data-theme="dark"] .icon-toggle .i-moon { display: none; }

/* ---------- hero ---------- */
.hero { border-bottom: 1px solid var(--hair); }
.hero-grid {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 0;
  align-items: stretch;
}
.hero-grid > * { min-width: 0; }
.hero-text { padding: 72px 48px 72px 0; }
.kicker {
  font: 600 12px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--g5); margin: 0 0 22px;
}
.hero-title {
  font: 800 clamp(38px, 5.4vw, 64px)/1.02 var(--sans);
  letter-spacing: -.025em; margin: 0 0 24px;
  overflow-wrap: anywhere;
}
.hero-title .hl { color: var(--accent); }
.hero-sub { font-size: 18px; line-height: 1.6; color: var(--g6); max-width: 46ch; margin: 0 0 34px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 34px; }
.hero-flags {
  list-style: none; display: flex; flex-wrap: wrap; gap: 0; margin: 0; padding: 0;
  border: 1px solid var(--hair); overflow: hidden; background: color-mix(in srgb, var(--paper) 70%, var(--g1));
}
.hero-flags li {
  font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: .05em;
  color: var(--g5); padding: 12px 18px; border-right: 1px solid var(--hair);
  transition: background-color var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart);
}
.hero-flags li::before { content: ""; width: 5px; height: 5px; background: var(--accent); display: inline-block; margin-right: 9px; vertical-align: 1px; transition: transform var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-med) var(--ease-out-quart); }
.hero-flags li:hover { background: color-mix(in srgb, var(--accent-soft) 64%, transparent); color: var(--ink); }
.hero-flags li:hover::before { transform: scale(1.45); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); }
.hero-flags li:last-child { border-right: 0; }

.hero-shot {
  border-left: 1px solid var(--hair); background: linear-gradient(135deg, var(--g1), color-mix(in srgb, var(--accent-soft) 46%, var(--paper)));
  display: flex; align-items: center; justify-content: center; padding: 36px;
  min-width: 0;
}
.shot-frame { flex: 1 1 0; width: 100%; max-width: 100%; min-width: 0; border: 1px solid var(--line); overflow: hidden; background: var(--paper); box-shadow: var(--shadow); transition: transform var(--motion-slow) var(--ease-out-quint), box-shadow var(--motion-slow) var(--ease-out-quint), border-color var(--motion-med) var(--ease-out-quart); }
.hero-shot:hover .shot-frame { transform: translateY(-6px) scale(1.01); border-color: var(--accent); box-shadow: var(--shadow-lift); }
.shot-bar {
  display: flex; gap: 7px; padding: 11px 13px; border-bottom: 1px solid var(--hair);
  background: var(--g1);
}
.shot-bar span { width: 10px; height: 10px; border: 1px solid var(--line); display: block; background: var(--paper); transition: background-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.hero-shot:hover .shot-bar span:nth-child(1) { background: color-mix(in srgb, var(--accent) 35%, var(--paper)); transform: translateY(-1px); }
.hero-shot:hover .shot-bar span:nth-child(2) { transform: translateY(-1px); transition-delay: 35ms; }
.hero-shot:hover .shot-bar span:nth-child(3) { transform: translateY(-1px); transition-delay: 70ms; }
.hero-shot img { filter: saturate(.82) contrast(1.01); display: block; width: 100%; max-width: 100%; min-width: 0; transition: filter var(--motion-slow) var(--ease-out-quint), transform var(--motion-slow) var(--ease-out-quint); }
.hero-shot:hover img { filter: saturate(.98) contrast(1.03); transform: scale(1.012); }

/* ---------- stats band ---------- */
.stats { border-bottom: 1px solid var(--hair); background: var(--panel); color: var(--on-panel); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); padding: 0; }
.stat {
  position: relative; overflow: hidden;
  padding: 34px 28px; border-right: 1px solid color-mix(in srgb, var(--on-panel) 22%, transparent);
  display: flex; flex-direction: column; gap: 8px;
}
.stat::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 0 35%, color-mix(in srgb, var(--on-panel) 10%, transparent) 50%, transparent 68% 100%);
  transform: translateX(-120%);
  transition: transform var(--motion-slow) var(--ease-out-quint);
}
.stat:hover::before { transform: translateX(120%); }
.stat-num, .stat-label { position: relative; transition: transform var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart); }
.stat:hover .stat-num { transform: translateY(-2px); }
.stat:last-child { border-right: 0; }
.stat-num { font: 800 clamp(40px, 5vw, 58px)/.9 var(--sans); letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stat-label { font: 600 12px/1.4 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: color-mix(in srgb, var(--on-panel) 60%, transparent); }

/* ---------- generic block ---------- */
.block { padding: 80px 0; border-bottom: 1px solid var(--hair); }
.block.alt { background: var(--g1); }
.block-head { max-width: 64ch; margin-bottom: 44px; }
.sec-no { font: 700 13px/1 var(--mono); letter-spacing: .1em; color: var(--accent); margin: 0 0 14px; }
.sec-title { font: 800 clamp(28px, 3.6vw, 42px)/1.05 var(--sans); letter-spacing: -.02em; margin: 0 0 14px; }
.sec-lead { font-size: 17px; color: var(--g6); margin: 0; max-width: 60ch; }

/* ---------- features ---------- */
.feature-tools {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center;
  justify-content: space-between; margin-bottom: 26px;
}
.search { display: flex; align-items: center; gap: 10px; border: 1px solid var(--line); padding: 0 14px; flex: 1 1 300px; min-width: 240px; background: var(--paper); }
.search { transition: background-color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-med) var(--ease-out-quart); }
.search:focus-within { background: color-mix(in srgb, var(--paper) 84%, var(--accent-soft)); border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 12%, transparent); }
.search svg { width: 18px; height: 18px; fill: var(--g5); flex: none; transition: fill var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.search:focus-within svg { fill: var(--accent); transform: scale(1.06); }
.search input { border: 0; outline: 0; font: 500 15px/1 var(--sans); padding: 13px 0; width: 100%; background: transparent; color: var(--ink); }
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  position: relative; overflow: hidden;
  font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: .03em;
  border: 1px solid var(--line); background: var(--paper); color: var(--g5);
  padding: 11px 14px; cursor: pointer; transition: background-color var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-med) var(--ease-out-quart);
}
.chip::after {
  content: ""; position: absolute; inset: auto 14px 6px; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: 0 50%;
  transition: transform var(--motion-med) var(--ease-out-quart);
}
.chip:hover { color: var(--ink); border-color: var(--accent); transform: translateY(-1px); box-shadow: 0 8px 18px color-mix(in srgb, var(--accent) 12%, transparent); }
.chip:hover::after, .chip.is-on::after { transform: scaleX(1); }
.chip.is-on { background: var(--accent-soft); color: var(--ink); border-color: var(--accent); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--hair); border-bottom: 0; }
.fcard {
  position: relative; overflow: hidden; padding: 26px 24px 28px; border: 1px solid var(--hair);
  margin: -1px 0 0 -1px; background: var(--paper); transition: background-color var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-med) var(--ease-out-quart);
}
.fcard::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(90deg, var(--accent), transparent 34%) 0 0 / 100% 1px no-repeat,
    radial-gradient(circle at 18% 0%, color-mix(in srgb, var(--accent-soft) 70%, transparent), transparent 54%);
  opacity: 0; transform: translateY(6px);
  transition: opacity var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart);
}
.fcard:hover { background: var(--g1); color: var(--ink); border-color: color-mix(in srgb, var(--accent) 54%, var(--hair)); transform: translateY(-2px); box-shadow: 0 14px 28px color-mix(in srgb, var(--accent) 10%, transparent); z-index: 1; }
.fcard:hover::before { opacity: 1; transform: translateY(0); }
.fcard:hover .fcard-no, .fcard:hover .fcard-cat { color: var(--accent); }
.fcard:hover .fcard-cat { border-color: var(--accent); }
.fcard-top, .fcard h3, .fcard p { position: relative; }
.fcard-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; transition: transform var(--motion-med) var(--ease-out-quart); }
.fcard-no { font: 700 12px/1 var(--mono); color: var(--g4); letter-spacing: .08em; }
.fcard-cat { font: 600 10px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--g5); border: 1px solid var(--hair); padding: 5px 7px; transition: color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), background-color var(--motion-med) var(--ease-out-quart); }
.fcard h3 { font: 700 18px/1.25 var(--sans); letter-spacing: -.01em; margin: 0 0 9px; transition: transform var(--motion-med) var(--ease-out-quart); }
.fcard p { font-size: 14.5px; line-height: 1.5; color: var(--g6); margin: 0; }
.fcard:hover p { color: var(--g6); }
.fcard:hover .fcard-top { transform: translateY(-1px); }
.fcard:hover h3 { transform: translateX(2px); }
.fcard.is-star::after { content: "★"; position: absolute; top: 24px; right: 22px; font-size: 12px; color: var(--ink); }
.fcard.is-star::after { transition: color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.fcard.is-star:hover::after { color: var(--accent); transform: rotate(18deg) scale(1.18); }

.feature-empty { text-align: center; padding: 48px; color: var(--g5); font: 600 14px/1 var(--mono); border: 1px solid var(--hair); border-top: 0; }
/* ---------- cover workbench ---------- */
.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition:
    border-color var(--motion-med) var(--ease-out-quart),
    box-shadow var(--motion-slow) var(--ease-out-quint),
    transform var(--motion-slow) var(--ease-out-quint);
}
.cover-grid:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}
.cover-card {
  min-width: 0;
  padding: 28px 26px 30px;
  border-right: 1px solid var(--hair);
  background: var(--paper);
  transition:
    background-color var(--motion-med) var(--ease-out-quart),
    color var(--motion-med) var(--ease-out-quart);
}
.cover-card:last-child { border-right: 0; }
.cover-card:hover { background: color-mix(in srgb, var(--paper) 74%, var(--accent-soft)); }
.cover-no {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 30px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  background: var(--accent-soft);
  color: var(--ink);
  font: 800 12px/1 var(--mono);
  letter-spacing: .04em;
  transition:
    background-color var(--motion-med) var(--ease-out-quart),
    border-color var(--motion-med) var(--ease-out-quart),
    transform var(--motion-med) var(--ease-out-quart);
}
.cover-card:hover .cover-no {
  background: var(--paper);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.cover-card h3 {
  margin: 0 0 10px;
  font: 800 19px/1.2 var(--sans);
  letter-spacing: -.01em;
}
.cover-card p {
  margin: 0;
  color: var(--g6);
  font-size: 15px;
  line-height: 1.55;
}

/* ---------- workflow steps ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--hair); border-bottom: 0; }
.step { position: relative; overflow: hidden; display: flex; gap: 16px; padding: 26px 24px; border: 1px solid var(--hair); margin: -1px 0 0 -1px; background: var(--paper); transition: background-color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.step::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 3px; background: var(--accent);
  transform: scaleY(0); transform-origin: 50% 100%;
  transition: transform var(--motion-med) var(--ease-out-quart);
}
.step:hover { background: color-mix(in srgb, var(--paper) 70%, var(--accent-soft)); border-color: color-mix(in srgb, var(--accent) 44%, var(--hair)); transform: translateY(-2px); }
.step:hover::before { transform: scaleY(1); }
.step-no {
  flex: none; width: 38px; height: 38px; border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font: 800 16px/1 var(--mono); background: var(--accent-soft);
  transition: background-color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart);
}
.step:hover .step-no { background: var(--paper); border-color: var(--accent); transform: translateX(2px); }
.step h3 { font: 700 16px/1.2 var(--sans); margin: 4px 0 6px; }
.step p { font-size: 14px; color: var(--g6); margin: 0; }

/* ---------- markdown layout ---------- */
.md-layout { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.1fr); gap: 0; border: 1px solid var(--line); overflow: hidden; box-shadow: var(--shadow); transition: border-color var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-slow) var(--ease-out-quint), transform var(--motion-slow) var(--ease-out-quint); }
.md-layout:hover { border-color: var(--accent); box-shadow: var(--shadow-lift); transform: translateY(-3px); }
.code {
  position: relative; margin: 0; padding: 22px 22px 24px; background: var(--panel);
  color: color-mix(in srgb, var(--on-panel) 82%, transparent);
  font: 500 13px/1.65 var(--mono); overflow-x: auto; border-right: 1px solid var(--line);
  min-width: 0;
}
.code code { white-space: pre; display: block; }
.copy-btn {
  position: absolute; top: 12px; right: 12px; font: 600 11px/1 var(--mono); text-transform: uppercase;
  letter-spacing: .05em; background: transparent;
  color: color-mix(in srgb, var(--on-panel) 70%, transparent);
  border: 1px solid color-mix(in srgb, var(--on-panel) 35%, transparent);
  padding: 7px 10px; cursor: pointer;
  transition:
    background-color var(--motion-med) var(--ease-out-quart),
    color var(--motion-med) var(--ease-out-quart),
    border-color var(--motion-med) var(--ease-out-quart),
    transform var(--motion-med) var(--ease-out-quart);
}
.copy-btn:hover { background: var(--on-panel); color: var(--panel); border-color: var(--on-panel); transform: translateY(-1px); }
.copy-btn.ok { background: var(--on-panel); color: var(--panel); border-color: var(--on-panel); }

.md-table { border-collapse: collapse; width: 100%; background: var(--paper); }
.md-table th, .md-table td { text-align: left; padding: 13px 18px; border-bottom: 1px solid var(--hair); font-size: 14px; vertical-align: top; }
.md-table tr { transition: background-color var(--motion-med) var(--ease-out-quart); }
.md-table tbody tr:hover { background: color-mix(in srgb, var(--accent-soft) 42%, transparent); }
.md-table th { font: 700 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--g5); background: var(--g1); }
.md-table td:first-child { width: 38%; color: var(--ink); }
.md-table td { color: var(--g6); }
.md-table tr:last-child td { border-bottom: 0; }
.md-table code, .install-steps code, .sec-lead code { font: 600 12.5px/1.4 var(--mono); background: var(--g2); padding: 2px 5px; color: var(--ink); }

/* ---------- best for / not for ---------- */
.fit-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); overflow: hidden; box-shadow: var(--shadow); transition: border-color var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-slow) var(--ease-out-quint); }
.fit-grid:hover { border-color: var(--accent); box-shadow: var(--shadow-lift); }
.fit-col { padding: 30px 30px 34px; }
.fit-col.yes { border-right: 1px solid var(--line); }
.fit-title { font: 800 14px/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; margin: 0 0 20px; display: flex; align-items: center; gap: 10px; }
.fit-title::before { width: 22px; height: 22px; border: 1px solid var(--line); background: var(--accent-soft); display: inline-flex; align-items: center; justify-content: center; font-size: 13px; transition: transform var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart); }
.fit-col:hover .fit-title::before { border-color: var(--accent); transform: rotate(-4deg) scale(1.04); }
.fit-col.yes .fit-title::before { content: "+"; }
.fit-col.no .fit-title::before { content: "\2212"; }
.fit-col ul { list-style: none; margin: 0; padding: 0; }
.fit-col li { font-size: 15px; line-height: 1.5; color: var(--g6); padding: 13px 0 13px 26px; border-top: 1px solid var(--hair); position: relative; transition: color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.fit-col li:first-child { border-top: 0; }
.fit-col li::before { position: absolute; left: 0; top: 13px; font: 700 13px/1.5 var(--mono); transition: transform var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart); }
.fit-col li:hover { color: var(--ink); transform: translateX(2px); }
.fit-col li:hover::before { transform: scale(1.18); color: var(--accent); }
.fit-col.yes li::before { content: "+"; color: var(--ink); }
.fit-col.no li::before { content: "\2212"; color: var(--g4); }

/* ---------- install ---------- */
.install-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); overflow: hidden; box-shadow: var(--shadow); transition: border-color var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-slow) var(--ease-out-quint), transform var(--motion-slow) var(--ease-out-quint); }
.install-grid:hover { border-color: var(--accent); box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.install-card { padding: 30px; min-width: 0; }
.install-card { transition: background-color var(--motion-med) var(--ease-out-quart); }
.install-card:last-child:hover { background: color-mix(in srgb, var(--paper) 78%, var(--accent-soft)); }
.install-card:first-child { border-right: 1px solid var(--line); background: var(--panel); color: var(--on-panel); }
.install-tag { font: 700 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--g4); margin: 0 0 14px; }
.install-card h3 { font: 800 22px/1.1 var(--sans); letter-spacing: -.01em; margin: 0 0 12px; }
.install-card > p { color: color-mix(in srgb, var(--on-panel) 70%, transparent); margin: 0 0 22px; font-size: 15px; }
.install-card:last-child > p, .install-card:last-child h3 { color: var(--ink); }
.install-card:first-child .solid-btn { background: var(--on-panel); color: var(--panel); border-color: var(--on-panel); }
.install-card:first-child .solid-btn:hover { background: transparent; color: var(--on-panel); }
.install-steps { margin: 0 0 22px; padding-left: 0; list-style: none; counter-reset: s; }
.install-steps li { position: relative; padding: 10px 0 10px 34px; border-top: 1px solid var(--hair); font-size: 14.5px; color: var(--g6); counter-increment: s; transition: color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.install-steps li:hover { color: var(--ink); transform: translateX(2px); }
.install-steps li:first-child { border-top: 0; }
.install-steps li::before { content: counter(s); position: absolute; left: 0; top: 9px; width: 22px; height: 22px; border: 1px solid var(--line); background: var(--accent-soft); display: flex; align-items: center; justify-content: center; font: 700 11px/1 var(--mono); color: var(--ink); transition: background-color var(--motion-med) var(--ease-out-quart), border-color var(--motion-med) var(--ease-out-quart), transform var(--motion-med) var(--ease-out-quart); }
.install-steps li:hover::before { background: var(--paper); border-color: var(--accent); transform: scale(1.05); }
.cmd { display: flex; align-items: stretch; border: 1px solid var(--line); overflow: hidden; min-width: 0; transition: border-color var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-med) var(--ease-out-quart); }
.cmd:hover { border-color: var(--accent); box-shadow: 0 8px 20px color-mix(in srgb, var(--accent) 10%, transparent); }
.cmd code { flex: 1; min-width: 0; padding: 13px 14px; font: 500 12.5px/1.4 var(--mono); overflow-x: auto; white-space: nowrap; color: var(--ink); }
.cmd .copy-btn { position: static; border: 0; border-left: 1px solid var(--hair); color: var(--g5); background: var(--g1); padding: 0 16px; }
.cmd .copy-btn:hover, .cmd .copy-btn.ok { background: var(--accent); color: var(--paper); }

/* ---------- faq ---------- */
.faq-list { border: 1px solid var(--line); overflow: hidden; box-shadow: var(--shadow); transition: border-color var(--motion-med) var(--ease-out-quart), box-shadow var(--motion-slow) var(--ease-out-quint); }
.faq-list:hover { border-color: var(--accent); box-shadow: var(--shadow-lift); }
.faq { border-top: 1px solid var(--hair); background: var(--paper); }
.faq:first-child { border-top: 0; }
.faq summary { cursor: pointer; list-style: none; padding: 20px 56px 20px 24px; font: 700 16px/1.35 var(--sans); position: relative; transition: background-color var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 24px; top: 50%; transform: translateY(-50%); font: 400 24px/1 var(--mono); color: var(--g5); transition: transform var(--motion-med) var(--ease-out-quart), color var(--motion-med) var(--ease-out-quart); }
.faq summary:hover { background: color-mix(in srgb, var(--accent-soft) 38%, transparent); color: var(--ink); }
.faq summary:hover::after { color: var(--accent); transform: translateY(-50%) rotate(90deg); }
.faq[open] summary::after { content: "\2212"; }
.faq[open] summary::after { transform: translateY(-50%) rotate(180deg); }
.faq[open] summary { color: var(--ink); }
.faq p { margin: 0; padding: 0 24px 22px; color: var(--g6); font-size: 15px; max-width: 70ch; }

/* ---------- support ---------- */
.support-grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: 56px; align-items: center; }
.support-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.support-qr { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); background: var(--paper); box-shadow: var(--shadow); }
.support-qr figure { margin: 0; border: 1px solid var(--line); overflow: hidden; background: var(--paper); box-shadow: var(--shadow); transition: transform var(--motion-slow) var(--ease-out-quint), box-shadow var(--motion-slow) var(--ease-out-quint), border-color var(--motion-med) var(--ease-out-quart); }
.support-qr figure { border-width: 0 1px 0 0; box-shadow: none; }
.support-qr figure:last-child { border-right: 0; }
.support-qr img { width: 100%; aspect-ratio: 1; object-fit: contain; padding: 14px; filter: saturate(.86) contrast(1.03); transition: filter var(--motion-med) var(--ease-out-quart), transform var(--motion-slow) var(--ease-out-quint); }
.support-qr figure:hover { border-color: var(--accent); box-shadow: var(--shadow-lift); transform: translateY(-4px); }
.support-qr figure:hover img { filter: none; transform: scale(1.025); }
.support-qr figcaption { font: 600 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .05em; text-align: center; padding: 10px; border-top: 1px solid var(--hair); color: var(--g5); }

/* ---------- footer ---------- */
.site-foot { background: var(--panel); color: var(--on-panel); }
.foot-inner { display: grid; grid-template-columns: 1.4fr 1fr auto; gap: 32px; align-items: center; padding-block: 40px; }
.foot-brand .brand-word { color: var(--on-panel); }
.foot-brand p { margin: 8px 0 0; color: color-mix(in srgb, var(--on-panel) 58%, transparent); font-size: 14px; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 20px; }
.foot-nav a { position: relative; font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: .04em; color: color-mix(in srgb, var(--on-panel) 64%, transparent); padding-bottom: 3px; transition: color var(--motion-med) var(--ease-out-quart); }
.foot-nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--on-panel); transform: scaleX(0); transform-origin: 0 50%; transition: transform var(--motion-med) var(--ease-out-quart); }
.foot-nav a:hover { color: var(--on-panel); }
.foot-nav a:hover::after { transform: scaleX(1); }
.foot-legal { font: 500 12px/1.5 var(--mono); color: color-mix(in srgb, var(--on-panel) 46%, transparent); margin: 0; text-align: right; }

/* ---------- language visibility ---------- */
body[data-lang="en"] [data-zh-only] { display: none; }
body[data-lang="zh"] [data-en-only] { display: none; }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-text { padding: 56px 0 48px; }
  .hero-shot { border-left: 0; border-top: 1px solid var(--hair); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--g6); }
  .feature-grid, .steps, .cover-grid { grid-template-columns: repeat(2, 1fr); }
  .cover-card:nth-child(2) { border-right: 0; }
  .cover-card:nth-child(3) { grid-column: 1 / -1; border-top: 1px solid var(--hair); }
  .support-grid { grid-template-columns: 1fr; gap: 36px; }
  .head-nav { display: none; }
}
@media (max-width: 640px) {
  :root { --pad: 18px; }
  .head-inner { gap: 12px; }
  .brand-word { font-size: 17px; }
  .head-actions { gap: 8px; min-width: 0; }
  .feature-grid, .steps, .cover-grid, .md-layout, .fit-grid, .install-grid { grid-template-columns: 1fr; }
  .cover-card,
  .cover-card:nth-child(2) {
    border-right: 0;
    border-top: 1px solid var(--hair);
  }
  .cover-card:first-child { border-top: 0; }
  .cover-card:nth-child(3) { grid-column: auto; }
  .code { border-right: 0; border-bottom: 1px solid var(--line); }
  .fit-col.yes, .install-card:first-child { border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-tools { flex-direction: column; align-items: stretch; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .support-qr { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .support-qr img { padding: 10px; }
  .foot-inner { grid-template-columns: 1fr; gap: 24px; }
  .foot-legal { text-align: left; }
  .head-actions .ghost-btn, .head-actions .solid-btn { display: none; }
  .lang-toggle { display: none; }
  .hero-title { font-size: clamp(28px, 8vw, 32px); }
  .hero-sub { max-width: 100%; overflow-wrap: anywhere; }
  .hero-shot { padding: 28px; }
}