/* ==========================================================================
   同行智能 Towin AI — 站点样式
   配色：暖白 #F7F5F0 / 纯白 #FFFFFF × 炭黑 #171717 × 同行橙 #E86F2C
   设计取向：咨询公司的稳重、科技公司的清楚、商业杂志的排版感
   字体：系统字体栈，无需联网即可正常显示
   ========================================================================== */

/* --- 1. 设计变量 --------------------------------------------------------- */
:root {
  /* 背景层：暖白与纯白交替 */
  --bg-warm: #f7f5f0;
  --bg-white: #ffffff;

  /* 文字：炭黑 + 两级灰 */
  --ink: #171717;
  --ink-2: #4f4f4a;
  --ink-3: #82827a;

  /* 线条：细线分隔 */
  --line: #e5e1d6;
  --line-strong: #cfc9b9;

  /* 同行橙 */
  --accent: #e86f2c;
  --accent-ink: #b8541a; /* 文字/小元素用，保证对比度 */
  --accent-wash: #fbf0e8;

  /* 排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue",
    Arial, sans-serif;
  --fs-display: 3.25rem;
  --fs-h1: 2.5rem;
  --fs-h2: 1.875rem;
  --fs-h3: 1.25rem;
  --fs-body: 1.0625rem;
  --fs-small: 0.9375rem;
  --fs-mini: 0.8125rem;

  /* 版心 */
  --maxw: 1180px;
  --readw: 44rem; /* 正文宽度，约 700px */
  --gutter: clamp(1.25rem, 4vw, 2.5rem);

  /* 节奏 */
  --section-y: 4rem;
  --radius: 3px;

  color-scheme: light;
}

/* --- 2. 基础重置 --------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem; /* 锚点跳转避开吸顶导航 */
}

body {
  margin: 0;
  background: var(--bg-warm);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.is-menu-open {
  overflow: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--ink);
  text-decoration: none;
}

a:hover {
  color: var(--accent-ink);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

p {
  margin: 0 0 1.05em;
}

p:last-child,
ul:last-child,
ol:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0 0 1.05em;
  padding-left: 1.15em;
}

li {
  margin-bottom: 0.35em;
}

li::marker {
  color: var(--ink-3);
}

strong,
b {
  font-weight: 700;
  color: var(--ink);
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

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

::selection {
  background: #f7d9c4;
  color: var(--ink);
}

/* --- 3. 布局容器 --------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.wrap--read {
  max-width: calc(var(--readw) + var(--gutter) * 2);
}

.section {
  padding: var(--section-y) 0;
  background: var(--bg-warm);
}

.section--white {
  background: var(--bg-white);
}

.section--tight {
  padding: 2.5rem 0;
}

.section--hairline {
  border-top: 1px solid var(--line);
}

/* --- 4. 排版元素 --------------------------------------------------------- */
.eyebrow {
  display: block;
  font-size: var(--fs-mini);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 1.1rem;
}

.section-head {
  max-width: var(--readw);
  margin-bottom: 1.5rem;
}

.section-head h2 {
  font-size: var(--fs-h2);
  margin-bottom: 0.7rem;
}

.section-head p {
  color: var(--ink-2);
  margin: 0;
}

.section-num {
  display: block;
  font-size: var(--fs-mini);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 0.85rem;
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.7;
  color: var(--ink-2);
}

.muted {
  color: var(--ink-3);
}

.small {
  font-size: var(--fs-small);
}

.mini {
  font-size: var(--fs-mini);
}

.prose {
  max-width: var(--readw);
}

.prose h2 {
  font-size: var(--fs-h2);
  margin: 2.6rem 0 0.9rem;
}

.prose h3 {
  font-size: var(--fs-h3);
  margin: 2rem 0 0.7rem;
}

.prose ul {
  padding-left: 1.15em;
}

.note {
  font-size: var(--fs-small);
  color: var(--ink-3);
  border-left: 2px solid var(--line-strong);
  padding-left: 1rem;
  margin-top: 1.75rem;
}

/* 间距工具类 */
.mt-sm {
  margin-top: 1rem;
}

.mt-md {
  margin-top: 1.5rem;
}

.mt-lg {
  margin-top: 2.25rem;
}

.mb-0 {
  margin-bottom: 0;
}

.tag {
  display: inline-block;
  font-size: var(--fs-mini);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--accent-ink);
  background: var(--accent-wash);
  border-radius: 999px;
  padding: 0.28em 0.75em;
}

.tag--plain {
  color: var(--ink-3);
  background: transparent;
  border: 1px solid var(--line);
}

/* --- 5. 按钮 ------------------------------------------------------------- */
.btn {
  --btn-gap: 0.55rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--btn-gap);
  min-height: 48px;
  padding: 0.72rem 1.4rem;
  border: 1.5px solid transparent;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  text-align: center;
  cursor: pointer;
  background: transparent;
  color: var(--ink);
  transition: background-color 0.16s ease, color 0.16s ease,
    border-color 0.16s ease, transform 0.12s ease;
  -webkit-appearance: none;
  appearance: none;
}

.btn:active {
  transform: translateY(1px);
}

/* 主按钮：橙底 + 炭黑字（对比度 5.9:1，满足无障碍） */
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #171717;
}

.btn--primary:hover {
  background: #f07c3d;
  border-color: #f07c3d;
  color: #171717;
}

/* 次按钮：描边 */
.btn--outline {
  border-color: var(--ink);
  color: var(--ink);
}

.btn--outline:hover {
  background: var(--ink);
  color: #fff;
}

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

.btn--ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.btn--sm {
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: var(--fs-small);
}

/* 看起来像链接的按钮（同样触发复制微信） */
.link-button {
  display: inline;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  background: none;
  font: inherit;
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
}

.link-button:hover {
  color: var(--accent-ink);
  border-bottom-color: var(--accent);
}

.btn--block {
  width: 100%;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

/* 图标（内联 SVG） */
.icon {
  width: 1.05em;
  height: 1.05em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* --- 6. 顶部导航 --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(247, 245, 240, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.site-header.is-stuck {
  border-bottom-color: var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex: none;
  color: var(--ink);
}

.brand img {
  height: 34px;
  width: auto;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__cn {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand__en {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* 桌面导航 */
.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 0.7rem;
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink-2);
  border-radius: var(--radius);
  background: none;
  border: 0;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--ink);
}

.nav__link[aria-current="page"]::after,
.nav__link.is-current::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--accent);
}

.dropdown a[aria-current="page"] {
  background: var(--bg-warm);
}

.dropdown a[aria-current="page"] strong {
  color: var(--accent-ink);
}

.drawer__sub a[aria-current="page"] {
  border-left-color: var(--accent);
  color: var(--ink);
  font-weight: 600;
}

.nav__caret {
  width: 0.6em;
  height: 0.6em;
  stroke-width: 2.2;
  transition: transform 0.18s ease;
}

.nav__item {
  position: relative;
}

.nav__item.is-open .nav__caret {
  transform: rotate(180deg);
}

/* 服务方案下拉 */
.dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 19rem;
  padding: 0.5rem;
  background: var(--bg-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 40px -22px rgba(23, 23, 23, 0.28);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
}

.nav__item.is-open .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown a {
  display: block;
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius);
}

.dropdown a:hover {
  background: var(--bg-warm);
}

.dropdown strong {
  display: block;
  font-size: var(--fs-small);
  font-weight: 700;
}

.dropdown span {
  display: block;
  font-size: var(--fs-mini);
  color: var(--ink-3);
  line-height: 1.5;
}

.nav__cta {
  margin-left: 0.6rem;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  color: var(--ink);
  padding: 0;
}

.nav-toggle__bars {
  position: relative;
  width: 20px;
  height: 12px;
}

.nav-toggle__bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.8px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle__bars span:nth-child(1) {
  top: 0;
}
.nav-toggle__bars span:nth-child(2) {
  top: 5.1px;
}
.nav-toggle__bars span:nth-child(3) {
  top: 10.2px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5.1px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5.1px) rotate(-45deg);
}

/* 移动端抽屉 */
.drawer {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--bg-white);
  max-height: calc(100dvh - 4.5rem);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.drawer.is-open {
  display: block;
}

.drawer__inner {
  padding: 1.25rem 0 2rem;
}

.drawer__group {
  border-bottom: 1px solid var(--line);
}

.drawer__group:last-of-type {
  border-bottom: 0;
}

.drawer__link,
.drawer__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  min-height: 52px;
  padding: 0.85rem 0;
  font-family: inherit;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--ink);
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
}

.drawer__sub {
  display: none;
  padding-bottom: 0.85rem;
}

.drawer__sub.is-open {
  display: block;
}

.drawer__sub a {
  display: block;
  padding: 0.6rem 0 0.6rem 0.9rem;
  border-left: 2px solid var(--line);
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.drawer__sub a:hover {
  border-left-color: var(--accent);
  color: var(--ink);
}

.drawer__sub a span {
  display: block;
  font-size: var(--fs-mini);
  color: var(--ink-3);
}

.drawer__cta {
  margin-top: 1.5rem;
}

.drawer__meta {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: var(--fs-small);
  color: var(--ink-3);
}

/* --- 7. 首屏 ------------------------------------------------------------- */
.hero {
  background: var(--bg-warm);
  padding: 3.5rem 0 2.5rem;
}

.hero__inner {
  max-width: 52rem;
}

.hero h1 {
  font-size: var(--fs-display);
  letter-spacing: 0;
  line-height: 1.22;
  margin-bottom: 1.5rem;
}

.hero__lede {
  font-size: clamp(1.05rem, 1.9vw, 1.28rem);
  line-height: 1.75;
  color: var(--ink-2);
  max-width: 40rem;
  margin-bottom: 1.5rem;
}

.hero__actions {
  margin-bottom: 1.5rem;
}

.hero__foot {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1.25rem 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
  max-width: 46rem;
}

.hero__foot dt {
  font-size: var(--fs-mini);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.3rem;
}

.hero__foot dd {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.hero__foot dd a {
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1px;
}

.hero__foot dd a:hover {
  border-bottom-color: var(--accent);
}

/* --- 8. 企业现状：三个条目 ---------------------------------------------- */
.status-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.status-item {
  padding: 1.75rem 1.75rem 0.5rem 0;
  border-right: 1px solid var(--line);
}

.status-item:last-child {
  border-right: 0;
  padding-right: 0;
}

.status-item:not(:first-child) {
  padding-left: 1.75rem;
}

.status-item__label {
  display: block;
  font-size: var(--fs-small);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.status-item__label::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 0.6rem;
  background: var(--ink);
  vertical-align: 0.08em;
}

.status-item p {
  color: var(--ink-2);
  font-size: var(--fs-small);
  margin: 0;
}

.status-close {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
  font-weight: 600;
  color: var(--ink);
}

/* --- 9. 三项服务（桌面端三行条目）-------------------------------------- */
/* 桌面端列标题 */
.service-rows__head {
  display: grid;
  grid-template-columns: 3.5rem 15rem 1fr 17rem;
  gap: 2rem;
  padding: 0 0 0.85rem;
  border-bottom: 1px solid var(--line-strong);
  font-size: var(--fs-mini);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

.service-rows__head span:nth-child(n + 2) {
  text-transform: none;
}

.service-rows__head + .service-rows {
  border-top: 0;
}

.service-rows {
  border-top: 1px solid var(--line);
}

.service-row {
  display: grid;
  grid-template-columns: 3.5rem 15rem 1fr 17rem;
  gap: 2rem;
  align-items: start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background-color 0.18s ease;
}

a.service-row:hover {
  background: rgba(232, 111, 44, 0.04);
  color: inherit;
}

.service-row__num {
  font-size: var(--fs-mini);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--accent);
  padding-top: 0.45rem;
}

.service-row__title {
  display: block;
  font-size: var(--fs-h3);
  margin-bottom: 0.45rem;
}

.service-row__title .icon {
  width: 0.85em;
  height: 0.85em;
  margin-left: 0.35rem;
  color: var(--ink-3);
  transition: transform 0.18s ease;
}

a.service-row:hover .service-row__title .icon {
  transform: translateX(3px);
  color: var(--accent);
}

.service-row__for {
  display: block;
  font-size: var(--fs-mini);
  color: var(--ink-3);
  margin: 0;
  line-height: 1.6;
}

.service-row__body {
  color: var(--ink-2);
  font-size: var(--fs-small);
  margin: 0;
}

.service-row__deliver {
  margin: 0;
  padding: 0;
  list-style: none;
}

.service-row__deliver li {
  position: relative;
  padding-left: 1.1rem;
  font-size: var(--fs-small);
  color: var(--ink-2);
  margin-bottom: 0.35rem;
}

.service-row__deliver li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1.5px;
  background: var(--accent);
}

.service-row__head {
  display: block;
}

.service-rows__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.75rem;
  font-size: var(--fs-small);
  color: var(--ink-3);
}

/* --- 10. 应用场景卡片 --------------------------------------------------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.scenario-card {
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  background: var(--bg-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease,
    transform 0.18s ease;
}

.section--white .scenario-card {
  background: var(--bg-warm);
}

a.scenario-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 20px 40px -30px rgba(23, 23, 23, 0.4);
  transform: translateY(-2px);
  color: inherit;
}

.scenario-card__num {
  font-size: var(--fs-mini);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.scenario-card h3 {
  font-size: var(--fs-h3);
  margin-bottom: 0.75rem;
}

.scenario-card dl {
  margin: 0 0 0.85rem;
  display: grid;
  gap: 0.9rem;
}

.scenario-card dt {
  font-size: var(--fs-mini);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.scenario-card dd {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.scenario-card__more {
  margin-top: auto;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

a.scenario-card:hover .scenario-card__more {
  color: var(--accent-ink);
}

/* --- 11. 合作方式四步 --------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.step {
  padding: 1.9rem 1.6rem 0.5rem 0;
  border-right: 1px solid var(--line);
}

.step:last-child {
  border-right: 0;
  padding-right: 0;
}

.step:not(:first-child) {
  padding-left: 1.6rem;
}

.step__num {
  display: block;
  font-size: var(--fs-mini);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.step h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.55rem;
}

.step p {
  font-size: var(--fs-small);
  color: var(--ink-2);
  margin: 0;
}

/* --- 12. 关于与联系 ----------------------------------------------------- */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.statement {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.015em;
  margin: 0 0 1.5rem;
}

.statement em {
  font-style: normal;
  color: var(--accent);
}

.contact-card {
  padding: clamp(1.75rem, 3.5vw, 2.5rem);
  background: var(--bg-warm);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.section--white .contact-card {
  background: var(--bg-warm);
}

.contact-card h3 {
  font-size: var(--fs-h3);
  margin-bottom: 0.5rem;
}

.contact-card > p {
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.contact-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.85rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  margin: 0;
}

.contact-list dt,
.contact-list__key {
  flex: none;
  width: 4.5rem;
  font-size: var(--fs-mini);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.contact-list__val {
  font-size: var(--fs-small);
  word-break: break-all;
  min-width: 0;
}

.contact-list__val a {
  border-bottom: 1px solid var(--line-strong);
}

.contact-list__val a:hover {
  border-bottom-color: var(--accent);
}

/* --- 13. 页脚 ----------------------------------------------------------- */
.site-footer {
  background: var(--bg-warm);
  border-top: 1px solid var(--line);
  padding: clamp(2.75rem, 6vw, 4rem) 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 2rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--line);
}

.footer-brand img {
  height: 40px;
  width: auto;
  margin-bottom: 1rem;
}

.footer-slogan {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.footer-note {
  font-size: var(--fs-mini);
  color: var(--ink-3);
  line-height: 1.7;
  margin: 0;
  max-width: 22rem;
}

.footer-col h4 {
  font-size: var(--fs-mini);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.9rem;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin-bottom: 0.5rem;
}

.footer-col a,
.footer-col span {
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.footer-col a:hover {
  color: var(--accent-ink);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  font-size: var(--fs-mini);
  color: var(--ink-3);
}

.footer-bottom p {
  margin: 0;
}

/* --- 14. 移动端底部咨询条 ---------------------------------------------- */
.mobile-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  display: none;
  gap: 0.5rem;
  padding: 0.6rem var(--gutter) calc(0.6rem + env(safe-area-inset-bottom));
  background: rgba(247, 245, 240, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  transform: translateY(110%);
  transition: transform 0.24s ease;
}

.mobile-cta.is-visible {
  transform: translateY(0);
}

.mobile-cta .btn {
  flex: 1;
  min-height: 46px;
  font-size: var(--fs-small);
}

/* --- 15. 轻提示（复制反馈）-------------------------------------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 5.5rem;
  z-index: 90;
  transform: translate(-50%, 0.75rem);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: calc(100vw - 2 * var(--gutter));
  padding: 0.7rem 1.1rem;
  background: var(--ink);
  color: #fff;
  font-size: var(--fs-small);
  font-weight: 600;
  border-radius: var(--radius);
  box-shadow: 0 20px 40px -20px rgba(23, 23, 23, 0.6);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.toast--warn {
  background: #7a2e0c;
}

.toast__wechat {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.04em;
  user-select: all;
  -webkit-user-select: all;
}

/* --- 16. 页面头部（详情页）-------------------------------------------- */
.page-head {
  padding: 2.5rem 0 2rem;
  background: var(--bg-warm);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-size: var(--fs-mini);
  color: var(--ink-3);
  margin-bottom: 1.35rem;
  padding: 0;
  list-style: none;
}

.breadcrumb li {
  margin: 0;
}

.breadcrumb a {
  color: var(--ink-3);
}

.breadcrumb a:hover {
  color: var(--accent-ink);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--line-strong);
}

.page-head h1 {
  font-size: var(--fs-h1);
  margin-bottom: 0.9rem;
  max-width: 34rem;
}

.page-head .lede {
  max-width: 42rem;
}

.page-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

/* 详情页双栏 */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 20rem;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.detail-grid > * {
  min-width: 0;
}

.detail-aside {
  position: sticky;
  top: 6rem;
  padding: 1.6rem;
  background: var(--bg-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.section--white .detail-aside,
.detail-aside {
  background: var(--bg-white);
}

.detail-aside h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.detail-aside p {
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.detail-aside .contact-list {
  margin-top: 1.25rem;
}

.detail-aside .contact-list li {
  padding: 0.7rem 0;
}

/* 交付物 / 清单块 */
.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.panel {
  padding: 1.5rem;
  background: var(--bg-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.section--white .panel {
  background: var(--bg-warm);
}

.panel h3 {
  font-size: 1rem;
  margin-bottom: 0.9rem;
}

.panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.panel li {
  position: relative;
  padding-left: 1.15rem;
  font-size: var(--fs-small);
  color: var(--ink-2);
  margin-bottom: 0.5rem;
}

.panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1.5px;
  background: var(--accent);
}

.panel li:last-child {
  margin-bottom: 0;
}

/* 详情页正文区块 */
.detail-body > .detail-block {
  padding-bottom: clamp(1.75rem, 3.5vw, 2.75rem);
  margin-bottom: clamp(1.75rem, 3.5vw, 2.75rem);
  border-bottom: 1px solid var(--line);
}

.detail-body > .detail-block:last-child {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

.detail-block__num {
  display: block;
  font-size: var(--fs-mini);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.detail-block h2 {
  font-size: clamp(1.2rem, 2.3vw, 1.5rem);
  margin-bottom: 0.85rem;
}

.detail-block > p {
  color: var(--ink-2);
}

.detail-block p {
  max-width: var(--readw);
}

/* 编号步骤列表 */
.step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  max-width: var(--readw);
}

.step-list li {
  position: relative;
  padding-left: 2.6rem;
  margin-bottom: 1.35rem;
}

.step-list li:last-child {
  margin-bottom: 0;
}

.step-list li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.05em;
  font-size: var(--fs-mini);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.step-list strong {
  display: block;
  margin-bottom: 0.25rem;
}

.step-list p {
  font-size: var(--fs-small);
  color: var(--ink-2);
  margin: 0;
}

/* --- 17. 折叠面板（FAQ / 移动端详情）---------------------------------- */
.faq {
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 0;
  font-size: 1.0625rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  margin-top: 0.5em;
  border-right: 1.8px solid var(--ink-3);
  border-bottom: 1.8px solid var(--ink-3);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.faq details[open] summary::after {
  transform: rotate(-135deg);
  margin-top: 0.75em;
}

.faq details[open] summary {
  color: var(--accent-ink);
}

.faq__body {
  padding: 0 0 1.4rem;
  max-width: var(--readw);
  color: var(--ink-2);
  font-size: var(--fs-small);
}

.faq__body p:last-child {
  margin-bottom: 0;
}

/* --- 18. 场景切换器 ---------------------------------------------------- */
.scenario-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.scenario-tab {
  min-height: 44px;
  padding: 0.55rem 1.05rem;
  font-family: inherit;
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease,
    border-color 0.16s ease;
}

.scenario-tab:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.scenario-tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.scenario-panel[hidden] {
  display: none;
}

.scenario-panel {
  animation: fade-in 0.28s ease;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.scenario-panel__head {
  max-width: var(--readw);
  margin-bottom: 1.75rem;
}

.scenario-panel__head h2 {
  font-size: var(--fs-h2);
  margin-bottom: 0.7rem;
}

.scenario-panel__head p {
  color: var(--ink-2);
}

/* 流程条：输入 → 处理 → 人工确认 → 输出 */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 0 0 2.25rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.flow__step {
  position: relative;
  padding: 1.5rem 1.5rem 1.5rem 0;
  border-right: 1px solid var(--line);
}

.flow__step:last-child {
  border-right: 0;
  padding-right: 0;
}

.flow__step:not(:first-child) {
  padding-left: 1.5rem;
}

.flow__step::after {
  content: "";
  position: absolute;
  right: -4.5px;
  top: 2.1rem;
  width: 7px;
  height: 7px;
  border-top: 1.5px solid var(--accent);
  border-right: 1.5px solid var(--accent);
  transform: rotate(45deg);
  background: var(--bg-warm);
}

.section--white .flow__step::after {
  background: var(--bg-white);
}

.flow__step:last-child::after {
  display: none;
}

.flow__label {
  display: block;
  font-size: var(--fs-mini);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin-bottom: 0.6rem;
}

.flow__step h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.flow__step p {
  font-size: var(--fs-small);
  color: var(--ink-2);
  margin: 0;
}

.flow__step--human .flow__label {
  color: var(--ink);
}

.flow__step--human {
  background: var(--accent-wash);
}

.section--white .flow__step--human {
  background: var(--accent-wash);
}

.flow__step--human::after {
  background: var(--accent-wash);
}

/* 演示样例块 */
.demo {
  margin-top: 2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-white);
  overflow: hidden;
}

.section--white .demo {
  background: var(--bg-warm);
}

.demo__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  background: var(--accent-wash);
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-mini);
  font-weight: 600;
  color: var(--accent-ink);
  letter-spacing: 0.04em;
}

.demo__body {
  padding: 1.35rem 1.25rem;
}

.demo__row {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.5rem 1.25rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-small);
}

.demo__row:last-child {
  border-bottom: 0;
}

.demo__key {
  font-weight: 600;
  color: var(--ink-3);
  font-size: var(--fs-mini);
  letter-spacing: 0.04em;
  padding-top: 0.15em;
}

.demo__val {
  color: var(--ink-2);
  min-width: 0;
}

.demo__val ul {
  margin: 0;
  padding-left: 1.1em;
}

/* --- 19. 通用列表/表格 -------------------------------------------------- */
.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.plain-list li {
  position: relative;
  padding-left: 1.15rem;
  margin-bottom: 0.55rem;
  color: var(--ink-2);
  font-size: var(--fs-small);
}

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1.5px;
  background: var(--accent);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 0;
  font-size: var(--fs-small);
}

.data-table caption {
  caption-side: top;
  text-align: left;
  font-size: var(--fs-mini);
  color: var(--ink-3);
  padding-bottom: 0.6rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.85rem 1rem 0.85rem 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table thead th {
  font-size: var(--fs-mini);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom-color: var(--line-strong);
}

.data-table tbody th {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.data-table td {
  color: var(--ink-2);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* CTA 区块 */
.cta-band {
  background: var(--bg-warm);
  border-top: 1px solid var(--line);
  padding: clamp(2.75rem, 6vw, 4.5rem) 0;
}

.cta-band__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
}

.cta-band h2 {
  font-size: var(--fs-h2);
  margin-bottom: 0.6rem;
}

.cta-band p {
  color: var(--ink-2);
  margin: 0;
  max-width: 38rem;
}

/* --- 20. 跳过导航 ------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background: var(--ink);
  color: #fff;
  border-radius: 0 0 var(--radius) 0;
  font-size: var(--fs-small);
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
}

/* --- 21. 响应式 --------------------------------------------------------- */
@media (max-width: 1080px) {
  .service-rows__head {
    display: none;
  }
  .service-rows__head + .service-rows {
    border-top: 1px solid var(--line);
  }
  .service-row {
    grid-template-columns: 2.75rem 1fr;
    grid-template-areas:
      "num head"
      ". body"
      ". deliver";
    gap: 0.6rem 1rem;
    padding: 1.35rem 0;
  }
  .service-row__num {
    grid-area: num;
    padding-top: 0.25rem;
  }
  .service-row__head {
    grid-area: head;
  }
  .service-row__body {
    grid-area: body;
  }
  .service-row__deliver {
    grid-area: deliver;
  }
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .nav,
  .nav__cta {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .drawer {
    display: none;
  }
  .drawer.is-open {
    display: block;
  }
  .status-grid {
    grid-template-columns: 1fr;
  }
  .status-item {
    padding: 1.5rem 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .status-item:last-child {
    border-bottom: 0;
    padding-bottom: 0.5rem;
  }
  .status-item:not(:first-child) {
    padding-left: 0;
  }
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .step {
    padding: 1.6rem 1.5rem 0.5rem 0;
    border-bottom: 1px solid var(--line);
  }
  .step:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
  }
  .step:nth-child(2n + 1) {
    padding-left: 0;
  }
  .step:nth-child(3) {
    padding-left: 0;
  }
  .step:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
  .detail-grid {
    grid-template-columns: 1fr;
  }
  .detail-aside {
    position: static;
    order: -1;
  }
  .about-split {
    grid-template-columns: 1fr;
  }
  .cta-band__inner {
    grid-template-columns: 1fr;
  }
  .flow {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow__step {
    padding: 1.35rem 1.25rem 1.35rem 0;
    border-bottom: 1px solid var(--line);
  }
  .flow__step:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
  }
  .flow__step:nth-child(3),
  .flow__step:nth-child(4) {
    padding-left: 0;
  }
  .flow__step:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
  .flow__step:nth-child(2)::after,
  .flow__step:nth-child(4)::after {
    display: none;
  }
}

@media (max-width: 720px) {
  :root {
    --fs-body: 1.0625rem; /* 移动端正文 17px */
    --fs-display: 2.125rem;
    --fs-h1: 1.875rem;
    --fs-h2: 1.5rem;
    --fs-h3: 1.125rem;
    --section-y: 2.5rem;
  }
  body {
    line-height: 1.7;
  }
  .hero {
    padding: 2.25rem 0 1.75rem;
  }
  .hero__lede {
    margin-bottom: 1.25rem;
  }
  .hero__foot {
    padding-top: 1rem;
    gap: 0.75rem;
  }
  .section-head {
    margin-bottom: 1.25rem;
  }
  .status-item {
    padding-top: 1rem;
    padding-bottom: 1rem;
  }
  .contact-card {
    padding: 1.25rem;
  }
  .page-head {
    padding: 1.75rem 0 1.5rem;
  }
  .detail-aside {
    padding: 1.25rem;
  }
  .hero h1 {
    line-height: 1.28;
  }
  .scenario-grid {
    grid-template-columns: 1fr;
  }
  .panel-grid {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .step {
    padding: 1.4rem 0 !important;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .step:last-child {
    border-bottom: 0;
  }
  .flow {
    grid-template-columns: 1fr;
  }
  .flow__step {
    padding: 1.25rem 0 !important;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .flow__step:last-child {
    border-bottom: 0;
  }
  .flow__step::after {
    display: none !important;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem 1.25rem;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-bottom {
    padding-bottom: 0.5rem;
  }
  .mobile-cta {
    display: flex;
  }
  /* 为底部咨询条预留空间，避免遮挡正文与页脚 */
  body.has-mobile-cta {
    padding-bottom: 4.75rem;
  }
  .site-footer {
    padding-bottom: 1.25rem;
  }
  .toast {
    bottom: 5.75rem;
  }
  .btn-row {
    width: 100%;
  }
  .hero__actions .btn {
    flex: 1 1 100%;
  }
  .data-table {
    min-width: 32rem;
  }
  .demo__row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

@media (max-width: 420px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .brand img {
    height: 30px;
  }
}

/* 横屏小高度：避免吸顶导航占满 */
@media (max-height: 520px) and (orientation: landscape) {
  .site-header .wrap {
    min-height: 3.5rem;
  }
}

/* --- 22. 无障碍：尊重减少动效偏好 ------------------------------------- */
@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;
  }
}

/* --- 23. 高对比度模式 -------------------------------------------------- */
@media (forced-colors: active) {
  .btn,
  .scenario-card,
  .panel,
  .contact-card,
  .detail-aside {
    border: 1px solid CanvasText;
  }
}