/* =========================================================================
   Tideway 官网 — 设计系统
   品牌 token 复用客户端 src/index.css：橙色主色 #ff9500 + Apple-HIG 中性灰。
   零依赖：纯手写现代 CSS，无框架。
   ========================================================================= */

:root {
  /* 品牌色 —— 与客户端一致 */
  --tw-accent-soft: #fff3e0;
  --tw-accent-bg: #ffe0b2;
  --tw-accent: #ff9500;
  --tw-accent-hover: #e68600;
  --tw-accent-deep: #bf7000;
  --tw-accent-bright: #ffab40;

  /* 中性 —— Apple HIG */
  --warm-00: #ffffff;
  --warm-01: #f5f5f7;
  --warm-015: #f2f2f7;
  --warm-02: #e5e5ea;
  --warm-03: #d1d1d6;
  --warm-05: #aeaeb2;
  --warm-06: #6e6e73;
  --warm-08: #3a3a3c;
  --warm-09: #1d1d1f;

  --ink: #1d1d1f;
  --ink-soft: #4b4b4f;
  --ink-muted: #6e6e73;

  /* 深色 CTA 渐变 —— 与客户端「进入工作区」一致 */
  --btn-dark: linear-gradient(180deg, #2c2c2e 0%, #1d1d1f 55%, #111113 100%);
  --btn-dark-hover: linear-gradient(180deg, #3a3a3c 0%, #2c2c2e 55%, #1d1d1f 100%);

  /* 排版 */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
    "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;

  /* 半径 / 阴影 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 12px 40px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08), 0 30px 90px rgba(0, 0, 0, 0.10);
  --shadow-accent: 0 8px 24px rgba(255, 149, 0, 0.28);

  --maxw: 1180px;
  --nav-h: 64px;
}

/* ------------------------------------------------------------------ reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--warm-00);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
h1,
h2,
h3,
h4,
p {
  margin: 0;
}
button {
  font-family: inherit;
  cursor: pointer;
}
/* 键盘焦点可见性（A11y），仅键盘触发、不影响鼠标点击 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--tw-accent);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ----------------------------------------------------------------- layout */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 96px 0;
}
.section--tight {
  padding: 64px 0;
}
.section-head {
  max-width: 680px;
  margin: 0 auto 56px;
  text-align: center;
}
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tw-accent-deep);
  background: var(--tw-accent-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.section-sub {
  margin-top: 16px;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--ink-muted);
}

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease,
    border-color 0.2s ease;
  white-space: nowrap;
}
.btn:active {
  transform: translateY(1px);
}
.btn--primary {
  color: #fff;
  background: var(--btn-dark);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover {
  background: var(--btn-dark-hover);
  box-shadow: var(--shadow-md);
}
.btn--accent {
  color: #fff;
  /* 下沉渐变以满足白字 AA 对比；浅色起点仅 8% 保留光泽 */
  background: linear-gradient(180deg, var(--tw-accent) 0%, var(--tw-accent-hover) 55%, var(--tw-accent-deep) 100%);
  box-shadow: var(--shadow-accent);
  text-shadow: 0 1px 1px rgba(120, 60, 0, 0.35);
}
.btn--accent:hover {
  filter: brightness(1.04);
  box-shadow: 0 10px 30px rgba(255, 149, 0, 0.36);
}
.btn--ghost {
  color: var(--ink);
  background: var(--warm-00);
  border-color: var(--warm-02);
}
.btn--ghost:hover {
  background: var(--warm-01);
  border-color: var(--warm-03);
}
.btn--lg {
  font-size: 16px;
  padding: 16px 30px;
}
.btn__icon {
  width: 18px;
  height: 18px;
}
.btn__sub {
  font-weight: 400;
  opacity: 0.7;
  font-size: 12px;
  margin-left: 2px;
}

/* -------------------------------------------------------------------- nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand__mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
.nav__links a:hover {
  color: var(--ink);
}
.nav__links a.is-active {
  color: var(--ink);
  font-weight: 600;
}
.nav__cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav__burger {
  display: none;
  background: none;
  border: none;
  padding: 8px;
}
.nav__burger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}
.nav__burger span + span {
  margin-top: 5px;
}

/* ------------------------------------------------------------------- hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  background:
    radial-gradient(60% 50% at 78% 8%, rgba(255, 171, 64, 0.20), transparent 70%),
    radial-gradient(50% 40% at 8% 30%, rgba(255, 149, 0, 0.10), transparent 72%),
    linear-gradient(180deg, #fffaf3 0%, #ffffff 55%);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero__pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--tw-accent-deep);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--tw-accent-bg);
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero__pill .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--tw-accent);
  box-shadow: 0 0 0 4px rgba(255, 149, 0, 0.18);
}
.hero h1 {
  font-size: clamp(38px, 5.4vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--tw-accent) 0%, var(--tw-accent-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__sub {
  margin-top: 22px;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--ink-soft);
  max-width: 520px;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}
.hero__meta {
  margin-top: 22px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--ink-muted);
}
.hero__meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

/* ------------------------------------------------- 产品 UI 复刻（mock 窗口）*/
.mock {
  position: relative;
  border-radius: var(--r-lg);
  background: var(--warm-015);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(0, 0, 0, 0.06);
  overflow: hidden;
  transform: perspective(1600px) rotateY(-7deg) rotateX(2deg);
}
.mock__bar {
  height: 40px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  background: var(--warm-00);
  border-bottom: 1px solid var(--warm-02);
}
.mock__bar i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--warm-03);
}
.mock__bar i:nth-child(1) {
  background: #ff5f57;
}
.mock__bar i:nth-child(2) {
  background: #febc2e;
}
.mock__bar i:nth-child(3) {
  background: #28c840;
}
.mock__bar b {
  margin-left: 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-muted);
}
.mock__body {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 14px;
  padding: 16px;
  min-height: 320px;
  background:
    radial-gradient(circle at 1px 1px, rgba(0, 0, 0, 0.05) 1px, transparent 0)
      0 0 / 22px 22px,
    var(--warm-015);
}
.wf-card {
  background: #fff;
  border: 2px solid var(--tw-accent);
  border-radius: var(--r-md);
  padding: 14px;
  box-shadow: var(--shadow-sm);
}
.wf-card__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.wf-card__ico {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--tw-accent-soft);
  display: grid;
  place-items: center;
  font-size: 17px;
}
.wf-card__head b {
  font-size: 14px;
}
.wf-card__head small {
  display: block;
  font-size: 11px;
  color: var(--ink-muted);
  font-weight: 400;
}
.wf-slots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.wf-slot {
  aspect-ratio: 3 / 4;
  border-radius: 10px;
  background: repeating-linear-gradient(
    -45deg,
    var(--warm-01),
    var(--warm-01) 7px,
    #fff 7px,
    #fff 14px
  );
  border: 1px solid var(--warm-02);
  position: relative;
}
.wf-slot--a {
  background: linear-gradient(160deg, #ffe6c2, #ffd29b);
}
.wf-slot--b {
  background: linear-gradient(160deg, #d8e9ff, #bcd6ff);
}
.wf-run {
  margin-top: 12px;
  height: 38px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--tw-accent-bright), var(--tw-accent));
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-accent);
}
.mock__result {
  border-radius: var(--r-md);
  background: linear-gradient(170deg, #efe7df 0%, #e3d6c8 100%);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: end center;
}
/* 抽象服装剪影，让"合成结果"更像出图而非纯色块（贴合服装 AI 主题） */
.mock__result::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2%;
  width: 50%;
  height: 82%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #9aa0a8 0%, #6b7079 70%, #565b63 100%);
  clip-path: polygon(
    40% 0, 60% 0, 70% 12%, 60% 20%, 80% 52%, 71% 100%, 29% 100%, 20% 52%, 40% 20%, 30% 12%
  );
  opacity: 0.82;
}
.mock__result::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(50% 38% at 50% 30%, rgba(255, 255, 255, 0.55), transparent),
    linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.08));
}
.mock__result span {
  position: relative;
  z-index: 1;
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
  padding: 4px 12px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}

/* --------------------------------------------------------------- 信任条 */
.trust {
  border-top: 1px solid var(--warm-02);
  border-bottom: 1px solid var(--warm-02);
  background: var(--warm-01);
}
.trust__row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 40px 0;
  text-align: center;
}
.trust__num {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink);
}
.trust__lbl {
  margin-top: 8px;
  font-size: 14px;
  color: var(--ink-muted);
}

/* --------------------------------------------------------------- features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--r-lg);
  background: var(--warm-00);
  border: 1px solid var(--warm-02);
  box-shadow: var(--shadow-sm);
  transition: transform 0.28s cubic-bezier(0.22, 0.61, 0.36, 1),
    box-shadow 0.28s ease, border-color 0.2s ease;
}
.feature:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--tw-accent-bg);
}
.feature__ico {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 24px;
  background: linear-gradient(160deg, var(--tw-accent-soft), #fff);
  border: 1px solid var(--tw-accent-bg);
  margin-bottom: 18px;
}
.feature__ico svg {
  width: 26px;
  height: 26px;
  stroke: var(--tw-accent-deep);
}
/* 演示步骤序号：圆形，区别于功能图标的圆角方块 */
.step-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  font-size: 22px;
  font-weight: 700;
  color: var(--tw-accent-deep);
  background: linear-gradient(160deg, var(--tw-accent-soft), #fff);
  border: 1px solid var(--tw-accent-bg);
}
.feature h3 {
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.01em;
}
.feature p {
  margin-top: 10px;
  font-size: 15px;
  color: var(--ink-muted);
}
.feature--wide {
  grid-column: span 3;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 30px;
  padding: 36px;
  background: linear-gradient(135deg, #1d1d1f 0%, #2c2c2e 100%);
  color: #fff;
  border: none;
}
.feature--wide h3 {
  font-size: 26px;
}
.feature--wide p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 16px;
}
.feature--wide .chat-mock {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-md);
  padding: 18px;
}
.chat-mock .bubble {
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 13.5px;
  margin-bottom: 10px;
  max-width: 85%;
}
.chat-mock .bubble--user {
  background: var(--tw-accent);
  color: #fff;
  margin-left: auto;
  border-bottom-right-radius: 4px;
}
.chat-mock .bubble--ai {
  background: rgba(255, 255, 255, 0.1);
  border-bottom-left-radius: 4px;
}

/* -------------------------------------------------------------- scenarios */
.scenarios {
  background: var(--warm-01);
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.scenario {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--warm-02);
  box-shadow: var(--shadow-sm);
}
.scenario__img {
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
  letter-spacing: 0.04em;
  position: relative;
}
.scenario__img--1 {
  background: linear-gradient(140deg, #ffb56b, #ff7a45);
}
.scenario__img--2 {
  background: linear-gradient(140deg, #7aa8ff, #5b7cff);
}
.scenario__img--3 {
  background: linear-gradient(140deg, #9be3b4, #57c08a);
}
.scenario__body {
  padding: 22px 24px 26px;
}
.scenario__body h3 {
  font-size: 18px;
}
.scenario__body p {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--ink-muted);
}

/* ------------------------------------------------------------- download CTA */
.dl-cta {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(50% 60% at 80% 20%, rgba(255, 171, 64, 0.25), transparent 60%),
    linear-gradient(135deg, #161617 0%, #1d1d1f 60%, #2a2118 100%);
  color: #fff;
  border-radius: var(--r-xl);
  padding: 60px;
  text-align: center;
}
.dl-cta h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.dl-cta p {
  margin: 16px auto 0;
  max-width: 560px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 17px;
}
.dl-cta__btns {
  margin-top: 32px;
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.dl-cta__note {
  margin-top: 18px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ----------------------------------------------------------- download page */
.dl-hero {
  padding: 72px 0 32px;
  text-align: center;
  background: linear-gradient(180deg, #fffaf3, #fff);
}
.dl-latest {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 8px;
}
.dl-card {
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--warm-02);
  background: #fff;
  box-shadow: var(--shadow-sm);
  padding: 30px;
  text-align: left;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.dl-card--primary {
  border-color: var(--tw-accent);
  box-shadow: 0 0 0 3px rgba(255, 149, 0, 0.12), var(--shadow-md);
}
.dl-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.dl-card__os {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.dl-card__os svg {
  width: 34px;
  height: 34px;
}
.dl-card__os h3 {
  font-size: 20px;
}
.dl-card__os small {
  display: block;
  font-size: 13px;
  color: var(--ink-muted);
  font-weight: 400;
}
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.03em;
}
.badge--latest {
  color: #fff;
  /* 下沉至 deep 以满足白字 AA（白 / #bf7000 ≈ 4.6:1） */
  background: var(--tw-accent-deep);
}
.badge--soft {
  color: var(--tw-accent-deep);
  background: var(--tw-accent-soft);
}
.badge--muted {
  color: var(--ink-muted);
  background: var(--warm-02);
}
.dl-card__meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--ink-muted);
  margin: 4px 0 20px;
}
.dl-card .btn {
  width: 100%;
}
.dl-current-os {
  position: absolute;
  top: 18px;
  right: 18px;
}

/* 安装指引 / 折叠 */
.acc {
  border: 1px solid var(--warm-02);
  border-radius: var(--r-md);
  overflow: hidden;
  background: #fff;
}
.acc + .acc {
  margin-top: 12px;
}
.acc > summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  font-size: 15.5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.acc > summary::-webkit-details-marker {
  display: none;
}
.acc > summary::after {
  content: "";
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--ink-muted);
  border-bottom: 2px solid var(--ink-muted);
  transform: rotate(45deg);
  transition: transform 0.22s ease;
  margin-top: -4px;
}
.acc[open] > summary::after {
  transform: rotate(-135deg);
  margin-top: 2px;
}
.acc__body {
  padding: 0 22px 20px;
  color: var(--ink-soft);
  font-size: 14.5px;
}
.acc__body ol,
.acc__body ul {
  margin: 0;
  padding-left: 20px;
}
.acc__body li {
  margin: 6px 0;
}

/* 历史版本 */
.history {
  margin-top: 16px;
  border: 1px solid var(--warm-02);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #fff;
}
.hist-row {
  padding: 20px 24px;
  border-top: 1px solid var(--warm-02);
}
.hist-row:first-child {
  border-top: none;
}
.hist-row__head {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.hist-row__ver {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.hist-row__date {
  font-size: 13px;
  color: var(--ink-muted);
}
.hist-row__dls {
  margin-left: auto;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hist-dl {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  border: 1px solid var(--warm-03);
  background: var(--warm-00);
  padding: 8px 14px;
  border-radius: 999px;
  display: inline-flex;
  gap: 7px;
  align-items: center;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.hist-dl:hover {
  background: var(--warm-01);
  border-color: var(--ink-muted);
}
.hist-dl small {
  color: var(--ink-muted);
  font-weight: 400;
}
.hist-row__log {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-muted);
}
.hist-row__log ul {
  margin: 6px 0 0;
  padding-left: 18px;
}
.hist-sha {
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--warm-05);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  word-break: break-all;
}
.history__more {
  display: block;
  width: 100%;
  text-align: center;
  padding: 16px;
  font-weight: 600;
  font-size: 14px;
  color: var(--tw-accent-deep);
  background: var(--warm-01);
  border: none;
  border-top: 1px solid var(--warm-02);
}
.history__more:hover {
  background: var(--tw-accent-soft);
}

/* ------------------------------------------------------------------ about */
.about-hero {
  padding: 80px 0 40px;
  background: linear-gradient(180deg, #fffaf3, #fff);
}
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 8px;
}
.value {
  padding: 28px;
  border-radius: var(--r-lg);
  background: var(--warm-00);
  border: 1px solid var(--warm-02);
}
.value h3 {
  font-size: 18px;
  margin-bottom: 8px;
}
.value p {
  font-size: 14.5px;
  color: var(--ink-muted);
}
.contact-card {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.contact-item {
  padding: 22px 24px;
  border-radius: var(--r-md);
  border: 1px solid var(--warm-02);
  background: var(--warm-01);
}
.contact-item small {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}
.contact-item p {
  margin-top: 6px;
  font-size: 16px;
  font-weight: 600;
}

/* --------------------------------------------------------------- legal/doc */
.doc {
  max-width: 780px;
  margin: 0 auto;
  padding: 64px 24px 96px;
}
.doc h1 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.doc .doc__meta {
  color: var(--ink-muted);
  font-size: 14px;
  margin: 12px 0 36px;
}
.doc h2 {
  font-size: 21px;
  margin: 36px 0 12px;
}
.doc p {
  color: var(--ink-soft);
  margin: 12px 0;
}
.doc ul {
  color: var(--ink-soft);
}
.callout {
  border-left: 3px solid var(--tw-accent);
  background: var(--tw-accent-soft);
  padding: 14px 18px;
  border-radius: 0 10px 10px 0;
  font-size: 14.5px;
  color: var(--ink-soft);
  margin: 20px 0;
}

/* ----------------------------------------------------------------- footer */
.footer {
  background: var(--warm-09);
  color: rgba(255, 255, 255, 0.65);
  padding: 64px 0 32px;
}
.footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 32px;
}
.footer__brand .brand {
  color: #fff;
  margin-bottom: 14px;
}
.footer__brand p {
  font-size: 14px;
  max-width: 280px;
  line-height: 1.7;
}
.footer__col h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer__col li {
  margin: 10px 0;
}
.footer__col a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.15s ease;
}
.footer__col a:hover {
  color: #fff;
}
.footer__bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
}
.footer__bottom a {
  color: rgba(255, 255, 255, 0.6);
}

/* ---------------------------------------------------------------- reveal
   渐进增强：默认内容可见。仅当 JS 确认运行（html.js-on）时才先隐藏再动画，
   保证 JS 报错 / 被禁用时内容始终可见，不会出现整屏空白。 */
.reveal {
  opacity: 1;
  transform: none;
}
.js-on .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.js-on .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ------------------------------------------------------------ responsive */
@media (max-width: 960px) {
  .hero__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .mock {
    transform: none;
    max-width: 480px;
  }
  .feature-grid,
  .scenario-grid,
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature--wide {
    grid-column: span 2;
    grid-template-columns: 1fr;
  }
  .footer__top {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 720px) {
  .section {
    padding: 64px 0;
  }
  .nav__links {
    display: none;
  }
  .nav__burger {
    display: block;
  }
  .nav__links.is-open {
    display: flex;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--warm-02);
    padding: 8px 0;
  }
  .nav__links.is-open li {
    padding: 12px 24px;
  }
  .feature-grid,
  .scenario-grid,
  .value-grid,
  .trust__row,
  .dl-latest {
    grid-template-columns: 1fr;
  }
  .feature--wide {
    grid-column: span 1;
  }
  .trust__row {
    grid-template-columns: 1fr 1fr;
    gap: 28px 16px;
  }
  .dl-cta {
    padding: 40px 24px;
  }
  .footer__top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .hist-row__dls {
    margin-left: 0;
    width: 100%;
  }
  /* 移动端 hero mock 上下堆叠，避免两列挤压 */
  .mock__body {
    grid-template-columns: 1fr;
  }
  .mock__result {
    min-height: 150px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}