/* ===========================================================
   鸥 · 创意工作室  —  进化柔性 UI (Soft UI Evolution)
   设计系统：单色底 + 双向柔和阴影 / 圆角 10px / Nunito
   =========================================================== */

:root {
  --wcag-level: "AA+";
  --contrast-ratio: 4.5;

  /* 浅色模式（默认） */
  --bg: #E9EFF6;
  --bg-sunken: #DEE8F2;
  --card: #FBFDFF;
  --ink: #1F2A37;
  --ink-soft: #43566B;
  --line: #C9D7E4;
  --accent: #0F609B;
  --accent-deep: #0B4A73;
  --accent-soft: #D9EBF8;
  --accent-ink: #FFFFFF;
  --ok: #1E7A4B;
  --warn: #9A5B00;

  --shadow-key: rgba(150, 174, 201, 0.55);
  --shadow-light: rgba(255, 255, 255, 0.95);

  --radius: 10px;
  --radius-sm: 8px;
  --radius-lg: 12px;

  --shadow-out:
    6px 6px 14px var(--shadow-key),
    -6px -6px 14px var(--shadow-light);
  --shadow-out-sm:
    3px 3px 7px var(--shadow-key),
    -3px -3px 7px var(--shadow-light);
  --shadow-in:
    inset 4px 4px 9px var(--shadow-key),
    inset -4px -4px 9px var(--shadow-light);
  --shadow-in-sm:
    inset 2px 2px 5px var(--shadow-key),
    inset -2px -2px 5px var(--shadow-light);
  --shadow-flat: 0 2px 4px rgba(31, 42, 55, 0.06);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 240ms;

  --wrap: 1200px;
  --space: 8px;
}

[data-theme="dark"] {
  --bg: #1D2632;
  --bg-sunken: #19212B;
  --card: #232F3D;
  --ink: #ECF2F8;
  --ink-soft: #AFBFCF;
  --line: #354454;
  --accent: #6FB6E8;
  --accent-deep: #4E9AD4;
  --accent-soft: #23394C;
  --accent-ink: #12202C;
  --ok: #6FD3A2;
  --warn: #E4B266;

  --shadow-key: rgba(0, 0, 0, 0.5);
  --shadow-light: rgba(255, 255, 255, 0.055);
  --shadow-flat: 0 2px 4px rgba(0, 0, 0, 0.3);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Nunito", "Nunito Sans", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  overflow-x: hidden;
}

img, svg { max-width: 100%; }

h1, h2, h3, h4 {
  color: var(--ink);
  margin: 0 0 8px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 5vw, 4rem); font-weight: 900; line-height: 1.1; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; }
h3 { font-size: 18px; font-weight: 700; line-height: 1.3; }
h4 { font-size: 16px; font-weight: 700; }

p { margin: 0 0 16px; color: var(--ink-soft); max-width: 34em; }
ul, ol { color: var(--ink-soft); }

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

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

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

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 12px 16px;
  border-radius: var(--radius);
}
.skip-link:focus { left: 16px; top: 16px; }

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

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .site-header { background: var(--bg); }
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 20px;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.brand:hover { color: var(--accent); }
.brand .logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow-out-sm);
  color: var(--accent);
  flex: none;
}
.brand small {
  display: block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.site-nav { margin-left: auto; }
.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 700;
  transition: color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-nav a:hover { color: var(--accent); background: var(--card); box-shadow: var(--shadow-out-sm); }
.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--bg-sunken);
  box-shadow: var(--shadow-in-sm);
}

.nav-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink-soft);
  box-shadow: var(--shadow-out-sm);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), color var(--dur) var(--ease);
}
.icon-btn:hover { color: var(--accent); box-shadow: var(--shadow-out); }
.icon-btn:active { box-shadow: var(--shadow-in-sm); transform: translateY(1px); }

.nav-toggle { display: none; margin-left: auto; }

.theme-toggle .ico-sun { display: none; }
[data-theme="dark"] .theme-toggle .ico-sun { display: block; }
[data-theme="dark"] .theme-toggle .ico-moon { display: none; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 4px 4px 10px var(--shadow-key), -2px -2px 8px var(--shadow-light);
}
.btn-primary:hover {
  background: var(--accent-deep);
  color: var(--accent-ink);
  transform: translateY(-2px);
  box-shadow: 6px 8px 16px var(--shadow-key), -2px -2px 8px var(--shadow-light);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: inset 3px 3px 7px rgba(0, 0, 0, 0.28);
}

.btn-secondary {
  background: var(--card);
  color: var(--accent);
  border-color: var(--line);
  box-shadow: var(--shadow-out-sm);
}
.btn-secondary:hover {
  color: var(--accent-deep);
  transform: translateY(-2px);
  box-shadow: var(--shadow-out);
}
.btn-secondary:active { transform: translateY(0); box-shadow: var(--shadow-in-sm); }

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: transparent;
  padding-left: 10px;
  padding-right: 10px;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}
.btn-ghost:hover { color: var(--accent-deep); text-decoration-thickness: 3px; }

.btn[disabled],
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
  background: var(--bg-sunken);
  color: var(--ink-soft);
  border-color: var(--line);
  box-shadow: none;
  transform: none;
}

.btn-sm { min-height: 40px; padding: 8px 16px; font-size: 14px; }
.btn-block { width: 100%; }

/* ---------------- 区块 ---------------- */
.section { padding: 72px 0; border-top: 1px solid var(--line); }
.section:first-of-type { border-top: 0; }
.section-tight { padding: 48px 0; }

.section-head { margin-bottom: 32px; max-width: 46em; }
.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.lead { font-size: 17px; line-height: 1.65; color: var(--ink-soft); }

/* ---------------- Hero ---------------- */
.hero { padding: 64px 0 72px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 48px;
  align-items: center;
}
.hero h1 { margin-bottom: 16px; }
.hero .lead { font-size: clamp(17px, 2vw, 19px); max-width: 30em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.hero-stats div { min-width: 120px; }
.hero-stats strong {
  display: block;
  font-size: 28px;
  font-weight: 900;
  color: var(--ink);
  line-height: 1.1;
}
.hero-stats span { font-size: 14px; color: var(--ink-soft); }

/* Hero 纯 CSS 装饰视觉 */
.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-out);
  display: grid;
  place-items: center;
  padding: 32px;
  overflow: hidden;
}
.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
}
.hero-visual::before {
  width: 190px; height: 190px;
  top: -40px; right: -40px;
  background: radial-gradient(circle at 35% 35%, var(--accent-soft), transparent 70%);
}
.hero-visual::after {
  width: 150px; height: 150px;
  bottom: -30px; left: -30px;
  background: radial-gradient(circle at 60% 40%, rgba(135, 206, 235, 0.45), transparent 70%);
}
.orb {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 28%, var(--card) 0%, var(--accent-soft) 45%, var(--accent) 100%);
  box-shadow:
    18px 18px 40px var(--shadow-key),
    -18px -18px 40px var(--shadow-light),
    inset 0 0 0 10px rgba(255, 255, 255, 0.18);
  animation: float 7s var(--ease) infinite alternate;
  position: relative;
  z-index: 1;
}
.hero-badge-float {
  position: absolute;
  z-index: 2;
  bottom: 24px;
  right: 24px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 12px 16px;
  box-shadow: var(--shadow-out-sm);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

@keyframes float {
  from { transform: translateY(-8px) scale(1); }
  to   { transform: translateY(8px) scale(1.03); }
}

/* ---------------- 信息条 chip ---------------- */
.chip-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: var(--bg-sunken);
  box-shadow: var(--shadow-in);
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.chip strong { color: var(--accent); font-weight: 700; }
.chip-accent { background: var(--accent-soft); border-color: transparent; color: var(--accent-deep); }

/* ---------------- 卡片 ---------------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-out);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: 8px 10px 22px var(--shadow-key), -6px -6px 16px var(--shadow-light); }
.card p:last-child { margin-bottom: 0; }
.card-ico {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  background: var(--bg-sunken);
  box-shadow: var(--shadow-in-sm);
  color: var(--accent);
  flex: none;
}
.card-link { margin-top: auto; font-weight: 700; font-size: 15px; min-height: 44px; display: inline-flex; align-items: center; }
.card-kicker { font-size: 13px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); }

/* 团队成员卡 */
.member-card { text-align: center; align-items: center; }
.avatar {
  width: 96px; height: 96px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 30px;
  font-weight: 900;
  color: var(--accent-deep);
  background: radial-gradient(circle at 32% 28%, var(--card), var(--accent-soft));
  box-shadow: 6px 6px 14px var(--shadow-key), -6px -6px 14px var(--shadow-light);
}
.member-role { font-size: 14px; color: var(--accent); font-weight: 700; margin: 0; }
.member-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }

/* ---------------- 控件展示 ---------------- */
.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--line);
}
.control-row:last-child { border-bottom: 0; }
.control-label {
  min-width: 132px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}
.control-label span { display: block; font-weight: 400; font-size: 13px; color: var(--ink-soft); }

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-soft);
  min-height: 44px;
}
.toggle input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.track {
  position: relative;
  width: 56px;
  height: 30px;
  border-radius: 999px;
  background: var(--bg-sunken);
  box-shadow: var(--shadow-in-sm);
  transition: background-color var(--dur) var(--ease);
  flex: none;
}
.track::after {
  content: "";
  position: absolute;
  top: 4px; left: 4px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--card);
  box-shadow: 2px 2px 5px var(--shadow-key), -1px -1px 3px var(--shadow-light);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.toggle input:checked + .track { background: var(--accent); box-shadow: inset 2px 2px 5px rgba(0, 0, 0, 0.25); }
.toggle input:checked + .track::after { transform: translateX(26px); background: #fff; }
.toggle input:focus-visible + .track { outline: 3px solid var(--accent); outline-offset: 2px; }
.toggle input:disabled + .track { opacity: 0.5; cursor: not-allowed; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border: 1px solid transparent;
}
.badge-neutral { background: var(--bg-sunken); color: var(--ink-soft); border-color: var(--line); }
.badge-ok { background: color-mix(in srgb, var(--ok) 16%, var(--card)); color: var(--ok); }
.badge-warn { background: color-mix(in srgb, var(--warn) 18%, var(--card)); color: var(--warn); }

/* ---------------- 表单 ---------------- */
.form-panel {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-out);
}
.form-grid { display: grid; gap: 20px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.field { display: flex; flex-direction: column; gap: 8px; }
.field-full { grid-column: 1 / -1; }
.field label {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.field .hint { font-size: 13px; color: var(--ink-soft); font-weight: 400; }

.input, .textarea, .select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 16px;
  color: var(--ink);
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-in-sm);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.textarea { min-height: 140px; resize: vertical; line-height: 1.6; }
.input::placeholder, .textarea::placeholder { color: color-mix(in srgb, var(--ink-soft) 70%, var(--bg)); }
.input:hover, .textarea:hover, .select:hover { border-color: var(--accent); }
.input:focus-visible, .textarea:focus-visible, .select:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
  background: var(--card);
}
.input:disabled, .textarea:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}
.checkbox-row { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: var(--ink-soft); }
.checkbox-row input { width: 20px; height: 20px; accent-color: var(--accent); margin-top: 2px; flex: none; }
.form-note { font-size: 13px; color: var(--ink-soft); margin: 0; }
.form-status {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 15px;
  font-weight: 700;
  display: none;
}
.form-status.is-visible { display: block; }
.form-status[data-state="error"] {
  background: color-mix(in srgb, var(--warn) 18%, var(--card));
  color: var(--warn);
}
.field-error { font-size: 13px; font-weight: 700; color: var(--warn); min-height: 0; }
.input[aria-invalid="true"], .textarea[aria-invalid="true"] { border-color: var(--warn); }

/* ---------------- 内容排版辅助 ---------------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: start;
}
.stack-lg > * + * { margin-top: 24px; }

.panel {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-out);
}
.panel-sunken {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-sunken);
  box-shadow: var(--shadow-in);
}

.list-check { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.list-check li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; }
.list-check svg { flex: none; margin-top: 4px; color: var(--accent); }

.stat-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.stat {
  padding: 20px;
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow-out-sm);
  text-align: center;
}
.stat strong { display: block; font-size: 26px; font-weight: 900; color: var(--accent); line-height: 1.2; }
.stat span { font-size: 13px; color: var(--ink-soft); }

.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.timeline li { display: grid; grid-template-columns: 96px 1fr; gap: 16px; align-items: start; }
.timeline .year { font-weight: 900; color: var(--accent); font-size: 15px; letter-spacing: 0.04em; }
.timeline .body { border-left: 2px solid var(--line); padding-left: 16px; }
.timeline .body p { margin: 0; font-size: 15px; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 16px;
  list-style: none;
  padding: 0;
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }

.page-head { padding: 48px 0 8px; }
.page-head h1 { font-size: clamp(1.9rem, 4vw, 3rem); }

.cta-band {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-out);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.cta-band p { margin: 4px 0 0; }

/* ---------------- 待补充占位组件 ---------------- */
.placeholder {
  border: 1px dashed var(--line);
  box-shadow: none;
  background: var(--card);
}
.placeholder-block { display: grid; gap: 12px; align-content: start; }
.todo-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.todo-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 15px;
  color: var(--ink-soft);
}
.todo-list li::before {
  content: "";
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border-radius: 4px;
  border: 1.5px dashed var(--line);
  background: var(--bg-sunken);
}

/* ---------------- 页脚 ---------------- */
.site-footer {
  margin-top: 72px;
  padding: 48px 0 24px;
  background: var(--bg-sunken);
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 32px;
}
.site-footer h3 { font-size: 15px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.site-footer a { color: var(--ink-soft); font-size: 15px; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-note { font-size: 14px; color: var(--ink-soft); max-width: 30em; }
.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1000px) {
  .hero-grid, .split { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .hero-visual { max-width: 420px; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .nav-toggle { display: grid; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    padding: 16px 24px 24px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-flat);
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; align-items: stretch; gap: 8px; }
  .site-nav a { min-height: 48px; }
  .nav-actions .btn-primary { display: none; }
  .grid-3, .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .form-grid { grid-template-columns: minmax(0, 1fr); }
  .section { padding: 56px 0; }
  .form-panel { padding: 24px; }
  .cta-band { padding: 28px; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .grid-4, .stat-row { grid-template-columns: minmax(0, 1fr); }
  .timeline li { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .brand small { display: none; }
}

@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;
  }
}