/* ==========================================================================
   AWX 云 · 技术文档风
   冷白底色 / 无衬线标题 / 钴蓝单色 / 细线分隔 / 等宽编号 / 克制动效
   ========================================================================== */

:root {
  color-scheme: light;
  --paper: #f7f8fa;
  --paper-2: #eef1f5;
  --paper-3: #e3e7ed;
  --screen: #ffffff;
  --ink: #101418;
  --ink-2: #2a3138;
  --muted: #4b5560;
  --muted-2: #7c858f;
  --line: rgba(16, 20, 24, 0.10);
  --line-strong: rgba(16, 20, 24, 0.24);
  --accent: #2f5bea;
  --accent-deep: #1f4bd8;
  --accent-soft: rgba(47, 91, 234, 0.12);
  --positive: #15803d;
  --danger: #b42318;
  --warning: #b45309;
  --max: 1200px;
  --gutter: clamp(20px, 5vw, 48px);
  --rail: 150px;
  --rail-gap: clamp(24px, 4vw, 64px);
  --font-display: "Inter", "SF Pro Display", -apple-system, "Segoe UI",
    "Noto Sans", "PingFang SC", "HarmonyOS Sans SC", "MiSans",
    "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-sans: "Inter", -apple-system, "Segoe UI", "Noto Sans",
    "PingFang SC", "HarmonyOS Sans SC", "MiSans",
    "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular",
    Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open { overflow: hidden; }

h1, h2, h3, h4, p, dl, dd, blockquote, figure { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

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

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

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb {
  background: var(--paper-3);
  border: 2px solid var(--paper);
}
::-webkit-scrollbar-thumb:hover { background: var(--muted-2); }

.container {
  width: min(var(--max), 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  transform: translateY(-160%);
  transition: transform 0.25s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.icon {
  width: 16px;
  height: 16px;
  flex: none;
}

/* --------------------------------------------------------------------------
   按钮与文本链接
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.16s var(--ease), color 0.16s var(--ease),
    border-color 0.16s var(--ease);
}
.btn .icon { transition: transform 0.16s var(--ease); }
.btn:hover .icon { transform: translateX(2px); }

.btn-primary { background: var(--accent); color: var(--paper); }
.btn-primary:hover { background: var(--accent-deep); }

.btn-ghost {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--ink); background: var(--paper-2); }

.btn-sm { min-height: 36px; padding: 8px 16px; font-size: 13px; }
.btn-xs { min-height: 32px; padding: 6px 12px; font-size: 12px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
  color: var(--ink);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.text-link .icon { transition: transform 0.16s var(--ease); }
.text-link:hover { color: var(--accent); border-color: var(--accent); }
.text-link:hover .icon { transform: translateX(2px); }

/* --------------------------------------------------------------------------
   页头
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.site-header.is-scrolled {
  background: var(--paper);
  border-bottom-color: var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 80px;
}

.brand {
  position: relative;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand-seal { width: 30px; height: 30px; flex: none; }
.brand-name {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--ink);
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3.6vw, 48px);
}
.nav-links { display: flex; align-items: center; gap: clamp(16px, 2.4vw, 32px); }
.nav-links a {
  position: relative;
  display: inline-block;
  padding: 8px 0;
  font-size: 14px;
  color: var(--muted);
  transition: color 0.16s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.18s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.is-active { color: var(--ink); }
.nav-links a.is-active::after,
.nav-links a:hover::after { transform: scaleX(1); }

.nav-actions { display: flex; align-items: center; gap: 20px; }

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}
.lang-switch button {
  padding: 2px;
  border: 0;
  background: none;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.16s var(--ease);
}
.lang-switch button:hover { color: var(--ink); }
.lang-switch button.is-active { color: var(--ink); }
.lang-switch span { color: var(--muted-2); }

.nav-toggle {
  display: none;
  position: relative;
  z-index: 3;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}
.nav-toggle span {
  position: absolute;
  left: 9px;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: top 0.24s var(--ease), transform 0.24s var(--ease);
}
.nav-toggle span:first-child { top: 16px; }
.nav-toggle span:last-child { top: 23px; }
.nav-toggle.is-open span:first-child { top: 20px; transform: rotate(45deg); }
.nav-toggle.is-open span:last-child { top: 20px; transform: rotate(-45deg); }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  padding-top: clamp(136px, 16vh, 176px);
  padding-bottom: 32px;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  align-items: start;
  gap: clamp(40px, 5vw, 72px);
}
.hero-copy { min-width: 0; max-width: 600px; padding-top: 28px; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--muted);
}
.eyebrow-mark {
  width: 7px;
  height: 7px;
  flex: none;
  background: var(--accent);
}

.hero h1 {
  margin: 24px 0 24px;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.4vw, 4rem);
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: -0.01em;
}
html[data-lang="en"] .hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.4vw, 3.9rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.lede {
  max-width: 32em;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--muted);
}

.hero-cta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 32px;
}

/* 施工图 --------------------------------------------------------------- */
.hero-drawing {
  min-width: 0;
  margin: 0;
  padding-top: 8px;
}
.drawing-label {
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--muted);
}
.drawing-stage {
  position: relative;
  height: 560px;
}

.phone {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  width: 264px;
  height: 540px;
  padding: 16px 16px 0;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--screen);
  box-shadow: 0 12px 32px rgba(16, 20, 24, 0.07);
}

.phone-store {
  font-size: 11px;
  color: var(--muted);
}
.phone-title {
  margin-top: 4px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.3;
}

.date-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 4px;
  margin-top: 16px;
  border-bottom: 1px solid var(--line);
}
.date-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 0 8px;
  border-bottom: 1.5px solid transparent;
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.date-cell em {
  font-style: normal;
  font-size: 11px;
  color: var(--muted);
}
.date-cell.is-on {
  border-bottom-color: var(--accent);
  color: var(--ink);
}
.date-cell.is-on em { color: var(--accent); }

.slot-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 16px;
  font-size: 11px;
  color: var(--muted);
}
.slot-count { font-variant-numeric: tabular-nums; }

.slot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
}
.slot {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  padding: 8px 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 11px;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.slot i {
  font-style: normal;
  font-size: 11px;
  color: var(--muted);
}
.slot.is-on {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--ink);
}
.slot.is-on i { color: var(--accent); }

.phone-note {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}
.phone-note p { margin-bottom: 6px; }
.phone-note li { position: relative; padding-left: 10px; line-height: 1.9; }
.phone-note li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 3px;
  height: 3px;
  background: var(--muted-2);
}

.phone-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: auto -16px 0;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}
.phone-price {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 11px;
  color: var(--muted);
}
.phone-price strong {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.phone-btn {
  padding: 8px 12px;
  border-radius: 3px;
  background: var(--accent);
  color: var(--paper);
  font-size: 11px;
  white-space: nowrap;
}

/* 批注引线 */
.callout {
  position: absolute;
  left: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  width: calc(100% - 276px);
  font-size: 12px;
  color: var(--muted);
}
.callout-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
}
.callout-text { white-space: nowrap; }
.callout-line {
  flex: 1;
  height: 1px;
  background: var(--line-strong);
}
.callout-pin {
  width: 5px;
  height: 5px;
  flex: none;
  margin-right: -3px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: var(--paper);
}
.callout-1 { top: 88px; }
.callout-2 { top: 220px; }
.callout-3 { top: 488px; }

/* 交付物 --------------------------------------------------------------- */
.delivery-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: clamp(48px, 5.5vw, 72px);
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}
.delivery-label {
  font-size: 12px;
  color: var(--muted);
}
.delivery-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink);
}
.delivery-list li { position: relative; }
.delivery-list li:not(:last-child)::after {
  content: "·";
  position: absolute;
  right: -12px;
  color: var(--muted-2);
}
.delivery-note {
  margin-left: auto;
  font-size: 12px;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   区块与标题
   -------------------------------------------------------------------------- */
.section {
  position: relative;
  padding-block: clamp(72px, 8vw, 112px);
  border-top: 1px solid var(--line);
}
.section-tint { background: var(--paper-2); }

.sec-head {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  column-gap: var(--rail-gap);
  margin-bottom: clamp(36px, 4.4vw, 56px);
}
.sec-meta {
  grid-column: 1;
  grid-row: 1 / span 2;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
}
.sec-no {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.sec-kicker { font-size: 12px; color: var(--muted); }
.sec-head h2 {
  grid-column: 2;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.55rem);
  font-weight: 500;
  line-height: 1.34;
  letter-spacing: 0;
}
html[data-lang="en"] .sec-head h2 { font-family: var(--font-display); }
.sec-desc {
  grid-column: 2;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--muted);
}

.section-body {
  margin-left: calc(var(--rail) + var(--rail-gap));
}

/* --------------------------------------------------------------------------
   服务索引
   -------------------------------------------------------------------------- */
.service-list { border-top: 1px solid var(--line-strong); }
.service-item { border-bottom: 1px solid var(--line); }
.service-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1.45fr) minmax(0, 0.75fr) 24px;
  align-items: start;
  gap: clamp(16px, 3vw, 40px);
  padding: 24px 16px;
  margin-inline: -16px;
  transition: background-color 0.16s var(--ease);
}
.service-row:hover { background: var(--paper-2); }
.service-no {
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.service-main h3 {
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 1.7vw, 1.45rem);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.service-main p {
  max-width: 30em;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}
.service-out {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  padding-top: 6px;
  font-size: 12px;
  color: var(--muted);
}
.service-tags span { white-space: nowrap; }
.service-tags span:not(:last-child)::after {
  content: " ·";
  color: var(--muted-2);
}
.service-arrow {
  align-self: center;
  color: var(--muted-2);
  transition: transform 0.16s var(--ease), color 0.16s var(--ease);
}
.service-row:hover .service-arrow {
  transform: translateX(3px);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   优势
   -------------------------------------------------------------------------- */
.advantage-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(32px, 5vw, 72px);
}
.advantage {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.adv-no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.adv-body h3 {
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 500;
}
.adv-body p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   流程（工单表）
   -------------------------------------------------------------------------- */
.process-list { border-top: 1px solid var(--line-strong); }
.process-list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 96px;
  align-items: baseline;
  gap: clamp(16px, 3vw, 40px);
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.step-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.step-body h3 {
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 500;
}
.step-body p {
  max-width: 52ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}
.step-out {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}
.step-dur {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   案例
   -------------------------------------------------------------------------- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.case {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  background: var(--screen);
}
.case-lg {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
}
.case-lg .preview { border-bottom: 0; border-right: 1px solid var(--line); }

.preview {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-2);
}
.preview-agent { min-height: 360px; }
.preview-mini,
.preview-dash,
.preview-admin { height: 340px; }

/* Agent 对话窗口 */
.pv-window {
  width: 100%;
  max-width: 440px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--screen);
  box-shadow: 0 8px 24px rgba(16, 20, 24, 0.06);
  overflow: hidden;
}
.pv-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.pv-title { font-size: 12px; font-weight: 500; }
.pv-meta { font-size: 11px; color: var(--muted); }
.pv-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
}
.msg {
  font-size: 12.5px;
  line-height: 1.75;
}
.msg-user {
  align-self: flex-end;
  max-width: 82%;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--paper-2);
  color: var(--ink);
}
.msg-bot {
  max-width: 92%;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}
.cite {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-top: 10px;
  font-size: 11px;
  color: var(--muted);
}
.cite-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-size: 11px;
  color: var(--accent);
}
.msg-actions {
  display: flex;
  gap: 16px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}
.pv-input {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}
.pv-send { color: var(--accent); }

/* 小程序核销卡 */
.mini-screen {
  width: 210px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--screen);
  box-shadow: 0 8px 24px rgba(16, 20, 24, 0.06);
}
.mini-store { font-size: 11px; color: var(--muted); }
.mini-ticket {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.mini-state {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--muted);
}
.mini-state::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--positive);
}
.mini-when {
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 15px;
  line-height: 1.4;
}
.mini-svc { margin-top: 2px; font-size: 12px; color: var(--muted); }
.mini-kv {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}
.mini-kv strong {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}
.mini-bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 11px;
  color: var(--muted);
}

/* 运营看板 */
.preview-dash .dash-window {
  width: 100%;
  max-width: 340px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--screen);
  box-shadow: 0 8px 24px rgba(16, 20, 24, 0.06);
}
.dash-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-size: 11px;
  color: var(--muted);
}
.dash-date { font-family: var(--font-mono); font-size: 11px; }
.dash-figure {
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.dash-change {
  margin-top: 2px;
  font-size: 11px;
  color: var(--positive);
}
.dash-chart { width: 100%; height: 84px; margin-top: 10px; }
.dash-rank {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}
.dash-rank li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 8px;
  font-size: 11.5px;
  color: var(--ink-2);
}
.dash-rank i {
  height: 4px;
  background: rgba(16, 20, 24, 0.1);
}
.dash-rank b {
  display: block;
  height: 100%;
  background: rgba(16, 20, 24, 0.32);
}
.dash-rank em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.case-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 24px;
}
.case-lg .case-body { padding: 32px; justify-content: center; }
.case-lg .tags { margin-top: 0; }
.case h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
}
.case-lg h3 { font-size: 1.45rem; }
.case p {
  margin-bottom: 20px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}
.case-lg p { max-width: 38ch; font-size: 14px; }
.tags {
  display: flex;
  flex-wrap: wrap;
  margin-top: auto;
  font-size: 12px;
  color: var(--muted);
}
.tags li { white-space: nowrap; }
.tags li:not(:last-child)::after {
  content: " ·";
  color: var(--muted-2);
}

.work-note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 20px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}
.note-mark {
  width: 6px;
  height: 6px;
  flex: none;
  margin-top: 6px;
  background: var(--accent);
}

/* --------------------------------------------------------------------------
   系统结构
   -------------------------------------------------------------------------- */
.arch-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 24px;
  align-items: stretch;
}
.diagram {
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--screen);
}
.diagram-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.diagram-title { font-size: 14px; font-weight: 500; }
.diagram-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.layers { display: flex; flex-direction: column; }
.layer {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-left: 2px solid transparent;
  background: var(--paper);
}
.layer.is-core {
  border-left-color: var(--accent);
  background: rgba(47, 91, 234, 0.05);
}
.layer-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.layer-items {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  font-size: 12.5px;
  color: var(--ink-2);
}
.layer-items li { white-space: nowrap; }

.layer-arrow {
  position: relative;
  display: block;
  width: 1px;
  height: 16px;
  margin-left: 53px;
  background: var(--line-strong);
}
.layer-arrow::after {
  content: "";
  position: absolute;
  left: -2px;
  bottom: -1px;
  border-left: 3px solid transparent;
  border-right: 3px solid transparent;
  border-top: 4px solid var(--line-strong);
}

.flow { display: flex; flex-direction: column; }
.flow li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.flow li:last-child { border-bottom: 0; }
.flow-no {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
}
.flow h3 { margin-bottom: 2px; font-size: 13px; font-weight: 500; }
.flow p { font-size: 12px; line-height: 1.7; color: var(--muted); }

/* --------------------------------------------------------------------------
   交付内容
   -------------------------------------------------------------------------- */
.handover-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  align-items: start;
  gap: clamp(32px, 5vw, 64px);
}
.deliverables {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 32px;
}
.deliverables li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.deliverable-icon { padding-top: 2px; color: var(--accent); }
.deliverable-icon .icon { width: 16px; height: 16px; }
.deliverables h3 { margin-bottom: 4px; font-size: 14px; font-weight: 500; }
.deliverables p { font-size: 12.5px; line-height: 1.75; color: var(--muted); }

.repo-card {
  border: 1px solid var(--line);
  background: var(--screen);
}
.repo-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.repo-title { font-family: var(--font-mono); font-size: 12px; color: var(--ink); }
.repo-note { font-family: var(--font-mono); font-size: 11px; color: var(--muted); }
.repo-tree {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2;
  color: var(--ink-2);
  -webkit-font-smoothing: auto;
}
.repo-tree span { color: var(--muted); }

/* --------------------------------------------------------------------------
   常见问题
   -------------------------------------------------------------------------- */
.faq-list { border-top: 1px solid var(--line-strong); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 500;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-icon {
  flex: none;
  color: var(--muted);
  transition: transform 0.16s var(--ease);
}
.faq-item[open] .faq-icon { transform: rotate(180deg); }
.faq-item p {
  max-width: 62ch;
  padding-bottom: 20px;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   后台案例预览
   -------------------------------------------------------------------------- */
.admin-window {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  width: 100%;
  max-width: 340px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--screen);
  box-shadow: 0 8px 24px rgba(16, 20, 24, 0.06);
}
.admin-side {
  padding: 12px 8px;
  border-right: 1px solid var(--line);
  background: var(--paper);
}
.admin-brand {
  display: block;
  margin-bottom: 12px;
  padding-left: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}
.admin-side li {
  padding: 5px 6px;
  border-radius: 3px;
  font-size: 11px;
  color: var(--muted);
}
.admin-side li.is-on {
  background: var(--accent-soft);
  color: var(--accent);
}
.admin-main { min-width: 0; }
.admin-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 11.5px;
  font-weight: 500;
}
.admin-filter {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--muted);
}
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
}
.admin-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
.admin-table tr:last-child td { border-bottom: 0; }
.cell-id { display: block; font-variant-numeric: tabular-nums; color: var(--ink); }
.cell-sub { display: block; font-size: 11px; color: var(--muted); }
.cell-amount {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.chip {
  display: inline-flex;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--paper-2);
  color: var(--ink-2);
  font-size: 11px;
  white-space: nowrap;
}
.chip-paid { background: rgba(21, 128, 61, 0.1); color: var(--positive); }
.chip-muted { color: var(--muted); }
.admin-foot {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   技术栈（规格表）
   -------------------------------------------------------------------------- */
.stack-table { border-top: 1px solid var(--line-strong); }
.stack-table > div {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  align-items: baseline;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.stack-table dt { font-size: 12px; color: var(--muted); }
.stack-table dd {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   关于
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  align-items: start;
  gap: clamp(40px, 6vw, 80px);
}
.about-lead {
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.95;
  color: var(--muted);
}
.pull-quote {
  margin: 36px 0;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.2vw, 1.8rem);
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0;
}
.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 32px;
}
.principle { padding-top: 14px; border-top: 1px solid var(--line); }
.principle-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.principle h3 { margin: 6px 0; font-size: 14px; font-weight: 500; }
.principle p { font-size: 13px; line-height: 1.75; color: var(--muted); }

.about-aside {
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--paper-2);
}
.aside-label { margin-bottom: 12px; font-size: 12px; color: var(--muted); }
.aside-mail {
  display: block;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  letter-spacing: -0.01em;
  color: var(--ink);
  word-break: break-all;
}
.aside-mail:hover { color: var(--accent); border-color: var(--accent); }
.aside-facts { margin: 20px 0 24px; }
.aside-facts div { padding: 12px 0; border-top: 1px solid var(--line); }
.aside-facts dt { margin-bottom: 4px; font-size: 12px; color: var(--muted); }
.aside-facts dd { font-size: 13px; }

/* --------------------------------------------------------------------------
   联系与表单
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  align-items: start;
  gap: clamp(36px, 6vw, 80px);
}
.contact-lead {
  max-width: 38ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}
.contact-mail {
  display: inline-block;
  margin-top: 24px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  letter-spacing: -0.01em;
  color: var(--ink);
  word-break: break-all;
}
.contact-mail:hover { color: var(--accent); border-color: var(--accent); }
.contact-facts {
  margin-top: 32px;
  border-top: 1px solid var(--line);
}
.contact-facts div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.contact-facts dt { margin-bottom: 0; font-size: 12px; color: var(--muted); }
.contact-facts dd { font-size: 13px; color: var(--ink-2); text-align: right; }

.form-card {
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--screen);
}
.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
}
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }
.field label { font-size: 12px; color: var(--muted); }
.req { color: var(--accent); }
.opt { margin-left: 4px; font-size: 11px; color: var(--muted); }

input,
select,
textarea {
  width: 100%;
  padding: 9px 0;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14.5px;
  line-height: 1.5;
  transition: border-color 0.16s var(--ease);
}
input::placeholder,
textarea::placeholder { color: var(--muted); opacity: 1; }
input:hover,
select:hover,
textarea:hover { border-bottom-color: var(--ink-2); }
input:focus,
select:focus,
textarea:focus { outline: none; border-bottom-color: var(--accent); }

select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 24px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5l5-5' fill='none' stroke='%2337322a' stroke-width='1.3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1px center;
  cursor: pointer;
}
select option { background: var(--paper); color: var(--ink); }
textarea { min-height: 110px; resize: vertical; }

input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--ink);
  box-shadow: 0 0 0 1000px var(--paper) inset;
}

.field.is-invalid input,
.field.is-invalid textarea,
.field.is-invalid select { border-bottom-color: var(--danger); }
.field-error { display: none; font-size: 12px; color: var(--danger); }
.field.is-invalid .field-error { display: block; }

.hp {
  position: absolute !important;
  left: -9999px !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.backend-note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0 0 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--accent);
}
.backend-note .note-mark { margin-top: 5px; }

.form-note {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.form-status {
  display: none;
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid transparent;
  font-size: 13px;
  line-height: 1.7;
}
.form-status h4 { margin-bottom: 6px; font-size: 13px; font-weight: 500; }
.form-status p { margin-bottom: 4px; }
.form-status.is-warning {
  display: block;
  border-color: rgba(180, 83, 9, 0.3);
  background: rgba(180, 83, 9, 0.06);
  color: var(--ink);
}
.form-status.is-success {
  display: block;
  border-color: rgba(21, 128, 61, 0.3);
  background: rgba(21, 128, 61, 0.07);
  color: var(--ink);
}
.form-status.is-error {
  display: block;
  border-color: rgba(180, 35, 24, 0.4);
  background: rgba(180, 35, 24, 0.07);
  color: var(--ink);
}
.status-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 10px; }

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
.site-footer {
  padding-block: 56px 28px;
  border-top: 1px solid var(--line-strong);
}
.footer-top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}
.footer-brand .brand-name { font-size: 1.1rem; }
.footer-tagline { margin-top: 12px; font-size: 13px; color: var(--muted); }
.footer-mail {
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 1.9vw, 1.45rem);
  letter-spacing: -0.01em;
  color: var(--ink);
  word-break: break-all;
}
.footer-mail:hover { color: var(--accent); border-color: var(--accent); }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
  padding-block: 32px;
}
.footer-heading { margin-bottom: 12px; font-size: 12px; color: var(--muted); }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col a,
.footer-col span { font-size: 13px; color: var(--ink-2); }
.footer-col a { transition: color 0.16s var(--ease); }
.footer-col a:hover { color: var(--accent); }
.footer-note p {
  margin-bottom: 6px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}
.footer-top-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.footer-top-link:hover { color: var(--accent); border-color: var(--accent); }

/* --------------------------------------------------------------------------
   动效：两次入场，滚动揭示
   -------------------------------------------------------------------------- */
.js .reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  transition-delay: calc(var(--i, 0) * 40ms);
}
.js .reveal.is-visible { opacity: 1; transform: none; }
.reveal-fallback .reveal { opacity: 1 !important; transform: none !important; }

.hero-copy { animation: rise 0.55s var(--ease) both; }
.hero-drawing { animation: rise 0.55s var(--ease) 0.06s both; }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1180px) {
  .callout { width: calc(100% - 276px); }
  .service-row { grid-template-columns: 44px minmax(0, 1.5fr) minmax(0, 0.75fr) 24px; }
}

@media (max-width: 1024px) {
  .hero { padding-top: 128px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .hero-copy { max-width: 640px; }
  .hero-drawing { max-width: 560px; width: 100%; margin-inline: auto; }
  .delivery-note { margin-left: 0; flex-basis: 100%; }
  .about-grid,
  .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .about-aside .btn-block { width: auto; }
  .arch-grid,
  .handover-grid { grid-template-columns: minmax(0, 1fr); }
  .work-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-lg,
  .case:last-child { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav { height: 72px; }
  .nav-toggle { display: block; }
  .nav-panel {
    position: fixed;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    gap: 32px;
    padding: 104px var(--gutter) 40px;
    background: var(--paper);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
      visibility 0.24s;
    overflow-y: auto;
  }
  .nav-panel.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-links { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-links a {
    display: block;
    padding: 15px 0;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-display);
    font-size: 1.7rem;
    color: var(--ink);
  }
  .nav-links a::after { display: none; }
  .nav-links a.is-active { color: var(--accent); }
  .nav-actions { flex-direction: column; align-items: stretch; gap: 18px; }
  .nav-actions .btn { width: 100%; }
  .lang-switch { align-self: flex-start; }
  .lang-switch button { font-size: 13px; }

  .case-lg { grid-template-columns: minmax(0, 1fr); }
  .case-lg .preview { border-right: 0; border-bottom: 1px solid var(--line); }
  .case-lg .case-body { padding: 24px; }
}

@media (max-width: 760px) {
  .section-body { margin-left: 0; }

  .callout { display: none; }
  .drawing-stage { height: auto; }
  .phone {
    position: relative;
    right: auto;
    margin-inline: auto;
  }

  .sec-head {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 12px;
    margin-bottom: 32px;
  }
  .sec-meta {
    grid-column: 1;
    grid-row: auto;
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
    padding-top: 10px;
  }
  .sec-head h2,
  .sec-desc { grid-column: 1; }

  .service-row {
    grid-template-columns: 32px minmax(0, 1fr) 20px;
    grid-template-areas:
      "no main arrow"
      "no tags arrow";
    row-gap: 10px;
    padding: 24px 12px;
    margin-inline: -12px;
  }
  .service-no { grid-area: no; padding-top: 3px; }
  .service-main { grid-area: main; }
  .service-tags { grid-area: tags; padding-top: 0; }
  .service-arrow { grid-area: arrow; align-self: start; margin-top: 2px; }

  .advantage-list { grid-template-columns: minmax(0, 1fr); }
  .advantage { padding: 24px 0; }

  .process-list li {
    grid-template-columns: 32px minmax(0, 1fr) auto;
    gap: 12px;
    padding: 18px 0;
  }

  .work-grid { grid-template-columns: minmax(0, 1fr); }
  .case-lg,
  .case:last-child { grid-column: auto; }
  .deliverables { grid-template-columns: minmax(0, 1fr); }
  .preview-agent { min-height: 0; padding: 20px; }
  .preview-mini,
  .preview-dash,
  .preview-admin { height: auto; min-height: 240px; padding: 20px; }

  .stack-table > div {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
  }

  .principles { grid-template-columns: minmax(0, 1fr); }
  .about-aside { padding: 24px; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-note { grid-column: span 2; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .hero { padding-top: 112px; }
  .hero h1 { font-size: clamp(1.9rem, 8.4vw, 2.7rem); }
  html[data-lang="en"] .hero h1 { font-size: clamp(1.85rem, 7.6vw, 2.5rem); }
  .lede { font-size: 14.5px; }
  .hero-cta { align-items: flex-start; flex-direction: column; gap: 18px; }

  .section { padding-block: 64px; }
  .sec-head h2 { font-size: clamp(1.6rem, 6.6vw, 2rem); }
  .sec-desc { font-size: 13.5px; }

  .delivery-strip { margin-top: 48px; }
  .delivery-list { gap: 8px 20px; font-size: 15px; }
  .delivery-list li:not(:last-child)::after { right: -12px; }

  .phone { width: 100%; max-width: 300px; }

  .service-tags { font-size: 11.5px; }
  .service-out { font-size: 12px; }
  .stack-table dd { font-size: 15px; }
  .layer { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .layer-arrow { margin-left: 16px; }

  .form-row { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .form-card { padding: 20px; }
  .contact-mail { font-size: 1.2rem; }

  .pull-quote { margin: 28px 0; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .footer-note { grid-column: auto; }
  .footer-top { align-items: flex-start; }
  .footer-mail { font-size: 1.2rem; }
}

@media (max-width: 420px) {
  .process-list li { grid-template-columns: 28px minmax(0, 1fr); }
  .step-dur { grid-column: 2; text-align: left; }
  .pv-window .msg-bot { max-width: 100%; }
}

/* --------------------------------------------------------------------------
   减弱动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .hero-copy,
  .hero-drawing { opacity: 1; transform: none; }
}