/* ==========================================================================
   锐动科技官网 · PC 端单页
   设计基准：1440px / 内容区 1200px
   ========================================================================== */

/* ---------- 0. 设计令牌 ---------- */
:root {
  /* 深色底 */
  --navy-950: #071019;
  --navy-900: #0A1628;
  --navy-880: #0C1829;
  --navy-850: #0E1B31;
  --navy-800: #132340;
  --navy-750: #12294D;
  --navy-700: #1B2C4A;

  /* 品牌蓝 */
  --blue-600: #2F6BFF;
  --blue-500: #2F6BFF;
  --blue-300: #7FA3FF;
  --blue-200: #8FB2FF;
  --blue-050: #EAF0FF;
  --blue-025: #FBFCFF;

  /* 文字 */
  --ink-900: #0A1628;
  --ink-800: #3D4759;
  --ink-600: #5A6B80;
  --ink-500: #63758C;
  --ink-400: #7C8CA0;
  --ink-300: #9AA7B8;

  /* 深底文字 */
  --on-dark-1: #FFFFFF;
  --on-dark-2: #D6E0EF;
  --on-dark-3: #A9B8CE;
  --on-dark-4: #8CA0BA;
  --on-dark-5: #7F92AC;
  --on-dark-6: #6E8099;
  --on-dark-7: #63779B;

  /* 描边与分隔 */
  --line-light: #E3EBF2;
  --line-light-2: #E7EDF5;
  --line-light-3: #EDF1F6;
  --line-dark: rgba(255, 255, 255, 0.09);
  --line-dark-2: rgba(255, 255, 255, 0.08);
  --line-dark-3: rgba(255, 255, 255, 0.11);

  /* 面 */
  --surface-white: #FFFFFF;
  --surface-muted: #F5F7FA;
  --surface-scene: #F7F9FC;
  --surface-input: #F6F8FB;

  /* 圆角 */
  --r-sm: 8px;
  --r-md: 10px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-2xl: 18px;
  --r-3xl: 20px;

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-num: "Inter", "SF Pro Display", "Helvetica Neue", Arial, var(--font-sans);
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 阴影 */
  --shadow-card: 0 6px 18px -4px rgba(10, 22, 40, 0.06);
  --shadow-accent: 0 8px 22px -4px rgba(47, 107, 255, 0.10);
  --shadow-header: 0 8px 24px -12px rgba(0, 0, 0, 0.55);

  /* 版心：1440 视口下内容宽 1200、左右各留 120 */
  --container: 1248px;
  --gutter: 24px;
}

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0;
  background: var(--navy-900);
  color: var(--ink-900);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, p, dl, dd, dt, ul, ol, figure {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

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

:focus-visible {
  outline: 2px solid var(--blue-300);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: rgba(47, 107, 255, 0.28);
  color: #fff;
}

/* ---------- 2. 基础版式 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: 88px 0;
}

.section--muted {
  background: var(--surface-muted);
}

.services { background: var(--surface-white); padding: 96px 0; }
.commitment { background: var(--surface-muted); }
.scenarios { background: var(--surface-white); }
.process { background: var(--surface-muted); }
.about { background: var(--navy-900); }
.faq { background: var(--surface-white); }
.contact { background: var(--navy-880); }

/* 区块抬头 */
.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 44px;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  font-weight: 500;
  line-height: 16px;
  color: var(--blue-600);
  letter-spacing: 0.06em;
}

.kicker--dark {
  color: var(--blue-300);
}

.kicker__bar {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 1px;
  background: var(--blue-600);
}

.section-head__title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.section-head__sub {
  max-width: 760px;
  font-size: 15px;
  font-weight: 400;
  line-height: 26px;
  color: var(--ink-600);
}

/* ---------- 3. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: var(--r-md);
  font-size: 15px;
  font-weight: 500;
  line-height: 21px;
  white-space: nowrap;
  transition: transform 0.18s ease, background-color 0.18s ease,
    box-shadow 0.18s ease, border-color 0.18s ease;
}

.btn--primary {
  background: var(--blue-600);
  color: #fff;
  box-shadow: 0 6px 18px -6px rgba(47, 107, 255, 0.6);
}

.btn--primary:hover {
  background: #245BF0;
  transform: translateY(-1px);
  box-shadow: 0 10px 24px -8px rgba(47, 107, 255, 0.7);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--ghost {
  padding: 13px 24px;
  background: transparent;
  color: var(--on-dark-2);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.btn--ghost:hover {
  border-color: rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.04);
}

.btn--nav {
  padding: 11px 22px;
  border-radius: var(--r-md);
  font-size: 14px;
  line-height: 20px;
  box-shadow: none;
}

.btn--nav:hover {
  transform: none;
  background: #245BF0;
}

.btn--block {
  width: 100%;
  padding: 13px 24px;
  border-radius: 9px;
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  background: var(--blue-600);
  color: #fff;
  font-size: 14px;
  transition: top 0.2s ease;
}

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

/* ---------- 5. 导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy-900);
  border-bottom: 1px solid var(--line-dark);
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(10, 22, 40, 0.92);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  box-shadow: var(--shadow-header);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--container);
  height: 76px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
}

.brand__mark {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  transition: transform 0.2s ease;
}

.brand:hover .brand__mark {
  transform: translateY(-1px);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand__name {
  font-size: 19px;
  font-weight: 700;
  line-height: 25px;
  color: #fff;
  letter-spacing: 0.01em;
}

.brand__en {
  font-family: var(--font-num);
  font-size: 9px;
  font-weight: 500;
  line-height: 12px;
  letter-spacing: 0.14em;
  color: #5E7699;
}

.nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav__link {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  color: var(--on-dark-3);
  transition: color 0.18s ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 1.5px;
  border-radius: 1px;
  background: var(--blue-300);
  transition: width 0.22s ease;
}

.nav__link:hover {
  color: #fff;
}

.nav__link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  border-radius: var(--r-sm);
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 1.6px;
  border-radius: 1px;
  background: #fff;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.6px) rotate(-45deg);
}

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  background: var(--navy-900);
  padding: 84px 0 92px;
  overflow: hidden;
}

/* 极淡的网格底纹，只在首屏出现 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 68% 42%, #000 0%, transparent 78%);
  mask-image: radial-gradient(ellipse 80% 70% at 68% 42%, #000 0%, transparent 78%);
  pointer-events: none;
}

.hero__row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 56px;
}

.hero__copy {
  display: flex;
  flex-direction: column;
  gap: 22px;
  flex: 1 1 auto;
  min-width: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  align-self: flex-start;
  padding: 7px 14px;
  border-radius: 100px;
  background: var(--navy-700);
  border: 1px solid rgba(47, 107, 255, 0.45);
  font-size: 12px;
  font-weight: 500;
  line-height: 17px;
  color: var(--blue-200);
  letter-spacing: 0.02em;
}

.eyebrow__dot {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue-600);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.16);
}

.hero__title {
  display: flex;
  flex-direction: column;
  font-size: 46px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: #fff;
}

.hero__title--accent {
  color: var(--blue-300);
}

.hero__sub {
  max-width: 580px;
  font-size: 15px;
  font-weight: 400;
  line-height: 29px;
  color: var(--on-dark-3);
}

.hero__cta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.hero__trust {
  font-size: 12px;
  line-height: 18px;
  color: var(--on-dark-6);
  letter-spacing: 0.01em;
}

/* 架构示意 */
.arch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  flex: 0 0 500px;
  width: 500px;
  padding: 30px 28px;
  border-radius: var(--r-3xl);
  background: var(--navy-850);
  border: 1px solid var(--line-dark);
  box-shadow: 0 30px 60px -40px rgba(0, 0, 0, 0.9);
}

.arch__caption {
  width: 100%;
  margin-bottom: 18px;
  font-size: 11px;
  font-weight: 500;
  line-height: 16px;
  color: var(--on-dark-7);
  letter-spacing: 0.05em;
}

.layer {
  display: flex;
  align-items: center;
  gap: 13px;
  width: 100%;
  padding: 15px 16px;
  border-radius: var(--r-lg);
  background: var(--navy-800);
  border: 1px solid var(--line-dark-3);
}

.layer--security {
  background: var(--navy-750);
  border: 1px solid rgba(47, 107, 255, 0.75);
  box-shadow: 0 0 0 4px rgba(47, 107, 255, 0.05);
}

.layer__icon {
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
}

.layer__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1 1 auto;
  min-width: 0;
}

.layer__text strong {
  font-size: 14px;
  font-weight: 700;
  line-height: 19px;
  color: #fff;
}

.layer__text em {
  font-style: normal;
  font-size: 11px;
  line-height: 16px;
  color: var(--on-dark-4);
}

.layer--security .layer__text em {
  color: #9DB6D8;
}

.layer__code {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  line-height: 14px;
  letter-spacing: 0.04em;
  color: #4A628A;
}

.layer--security .layer__code {
  color: #6E8FC4;
}

.arch__link {
  display: block;
  width: 1px;
  height: 20px;
  background: rgba(47, 107, 255, 0.55);
}

.arch__note {
  width: 100%;
  margin-top: 18px;
  font-size: 11px;
  line-height: 17px;
  color: var(--on-dark-7);
}

/* ---------- 7. 数字信任条 ---------- */
.stats {
  background: var(--navy-880);
  padding: 38px 0;
}

.stats__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  flex: 1 1 0;
  text-align: center;
}

.stat__num {
  font-family: var(--font-num);
  font-size: 42px;
  font-weight: 700;
  line-height: 48px;
  letter-spacing: -0.02em;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-size: 12px;
  line-height: 17px;
  color: #8296AE;
}

.stat__div {
  flex: 0 0 1px;
  width: 1px;
  height: 44px;
  background: rgba(255, 255, 255, 0.10);
}

/* ---------- 8. 业务卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 374px;
  padding: 26px;
  border-radius: var(--r-xl);
  background: var(--surface-white);
  border: 1px solid var(--line-light);
  box-shadow: var(--shadow-card);
  transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px -10px rgba(10, 22, 40, 0.14);
}

.card--accent {
  background: var(--blue-025);
  border: 1.5px solid rgba(47, 107, 255, 0.5);
  box-shadow: var(--shadow-accent);
}

.card--accent:hover {
  border-color: rgba(47, 107, 255, 0.72);
  box-shadow: 0 18px 38px -10px rgba(47, 107, 255, 0.20);
}

.card__icon {
  display: block;
  width: 44px;
  height: 44px;
}

.card__title {
  font-size: 19px;
  font-weight: 700;
  line-height: 26px;
  color: var(--ink-900);
}

.card__badge {
  align-self: flex-start;
  padding: 5px 10px;
  border-radius: 6px;
  background: var(--blue-050);
  font-size: 11px;
  font-weight: 500;
  line-height: 15px;
  color: var(--blue-600);
}

.card__desc {
  font-size: 13px;
  line-height: 22px;
  color: var(--ink-500);
}

.card__div {
  display: block;
  height: 1px;
  margin: 2px 0;
  background: var(--line-light-3);
}

.card--accent .card__div {
  background: #E4EBFA;
}

.card__list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin-top: auto;
}

.card__list li {
  position: relative;
  padding-left: 13px;
  font-size: 13px;
  line-height: 20px;
  color: var(--ink-800);
}

.card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(47, 107, 255, 0.35);
}

.card--accent .card__list li::before {
  background: rgba(47, 107, 255, 0.55);
}

/* ---------- 9. 整包交付承诺 ---------- */
.promise {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  align-items: stretch;
}

.promise__col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 248px;
  padding: 26px;
  border-radius: var(--r-xl);
  background: var(--surface-white);
  border: 1px solid var(--line-light);
  box-shadow: var(--shadow-card);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.promise__col:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px -10px rgba(10, 22, 40, 0.12);
}

.promise__head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  line-height: 20px;
  color: var(--ink-900);
}

.promise__dot {
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.promise__dot--blue { background: var(--blue-600); }
.promise__dot--grey { background: #8A97A8; }
.promise__dot--green { background: #12A150; }

.promise__list {
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.promise__list li {
  position: relative;
  padding-left: 15px;
  font-size: 13px;
  line-height: 22px;
  color: var(--ink-800);
}

.promise__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 1.5px;
  border-radius: 1px;
  background: #C2CFE0;
}

/* ---------- 10. 应用场景 ---------- */
.scenes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.scene {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 272px;
  padding: 26px;
  border-radius: var(--r-xl);
  background: var(--surface-scene);
  border: 1px solid #E8EDF5;
  transition: background-color 0.24s ease, border-color 0.24s ease, transform 0.24s ease;
}

.scene:hover {
  background: #FFFFFF;
  border-color: rgba(47, 107, 255, 0.28);
  transform: translateY(-3px);
  box-shadow: 0 16px 34px -12px rgba(10, 22, 40, 0.12);
}

.scene__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 24px;
  color: var(--ink-900);
}

.scene__div {
  display: block;
  height: 1px;
  background: var(--line-light-2);
}

.scene__problem {
  min-height: 44px;
  font-size: 13px;
  line-height: 22px;
  color: var(--ink-500);
}

.scene__label {
  margin-top: auto;
  padding-top: 2px;
  font-size: 11px;
  font-weight: 500;
  line-height: 15px;
  color: var(--blue-600);
  letter-spacing: 0.04em;
}

.scene__solution {
  font-size: 13px;
  line-height: 22px;
  color: var(--ink-900);
}

/* ---------- 11. 交付流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
}

.step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding-top: 18px;
  border-top: 1px solid #DCE4EE;
}

.step::before {
  content: "";
  position: absolute;
  top: -1.5px;
  left: 0;
  width: 28px;
  height: 2px;
  border-radius: 1px;
  background: var(--blue-600);
}

.step__num {
  font-family: var(--font-num);
  font-size: 28px;
  font-weight: 700;
  line-height: 34px;
  letter-spacing: -0.02em;
  color: #C2CFE0;
}

.step__title {
  font-size: 15px;
  font-weight: 700;
  line-height: 21px;
  color: var(--ink-900);
}

.step__deliver {
  font-size: 12.5px;
  line-height: 21px;
  color: var(--ink-500);
}

.step__time {
  margin-top: auto;
  padding-top: 4px;
  font-size: 11px;
  font-weight: 500;
  line-height: 15px;
  color: var(--blue-600);
  letter-spacing: 0.02em;
}

/* ---------- 12. 关于我们 ---------- */
.about__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 480px;
  gap: 64px;
  align-items: start;
}

.about__left {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about__title {
  font-size: 30px;
  font-weight: 700;
  line-height: 42px;
  letter-spacing: -0.01em;
  color: #fff;
}

.about__p {
  font-size: 14px;
  line-height: 28px;
  color: var(--on-dark-3);
}

.about__p--dim {
  color: var(--on-dark-5);
}

.creds {
  display: flex;
  flex-direction: column;
}

.creds__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-dark-2);
}

.creds__row dt {
  font-size: 13px;
  font-weight: 500;
  line-height: 18px;
  color: var(--on-dark-2);
}

.creds__row dt.creds__dt--strong {
  color: #fff;
}

.creds__row dd {
  font-size: 12px;
  line-height: 17px;
  color: var(--on-dark-6);
  white-space: nowrap;
}

.creds__row dd.creds__dd--accent {
  font-weight: 500;
  color: var(--blue-300);
}

/* ---------- 13. FAQ ---------- */
.faq__list {
  border-top: 1px solid var(--line-light-2);
}

.faq__item {
  border-bottom: 1px solid var(--line-light-2);
}

.faq__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  padding: 20px 4px 20px 0;
  text-align: left;
  font-size: 15px;
  font-weight: 500;
  line-height: 22px;
  color: var(--ink-900);
  transition: color 0.18s ease;
}

.faq__q:hover {
  color: var(--blue-600);
}

.faq__icon {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
}

.faq__icon i {
  position: absolute;
  top: 50%;
  left: 0;
  width: 16px;
  height: 1.5px;
  border-radius: 1px;
  background: #98A6B8;
  transition: transform 0.26s ease, background-color 0.2s ease;
}

.faq__icon i:nth-child(1) {
  transform: translateY(-50%);
}

.faq__icon i:nth-child(2) {
  transform: translateY(-50%) rotate(90deg);
}

.faq__q[aria-expanded="true"] .faq__icon i:nth-child(1) {
  background: var(--blue-600);
}

.faq__q[aria-expanded="true"] .faq__icon i:nth-child(2) {
  transform: translateY(-50%) rotate(0deg);
  background: var(--blue-600);
}

.faq__panel {
  overflow: hidden;
}

.faq__panel > p {
  padding-right: 48px;
  font-size: 14px;
  line-height: 26px;
  color: var(--ink-600);
}

.faq__panel > p:first-child {
  padding-top: 2px;
}

.faq__panel > p:last-child {
  padding-bottom: 22px;
}

.faq__panel > p + p {
  padding-top: 10px;
}

/* ---------- 14. 联系我们 ---------- */
.contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 460px;
  gap: 56px;
  align-items: start;
}

.contact__left {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.contact__title {
  font-size: 30px;
  font-weight: 700;
  line-height: 42px;
  letter-spacing: -0.01em;
  color: #fff;
}

.contact__sub {
  font-size: 14px;
  line-height: 27px;
  color: var(--on-dark-3);
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 8px;
  padding-top: 22px;
  border-top: 1px solid var(--line-dark-2);
}

.info-line {
  display: flex;
  align-items: baseline;
  gap: 16px;
  width: 100%;
}

.info-line__key {
  flex: 0 0 44px;
  font-size: 12px;
  line-height: 18px;
  color: var(--on-dark-6);
}

.info-line__val {
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  color: var(--on-dark-2);
  transition: color 0.18s ease;
}

.info-line__val--mono {
  font-family: var(--font-num);
  letter-spacing: 0.01em;
}

a.info-line__val:hover {
  color: var(--blue-300);
}

.contact__promise {
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin-top: 14px;
}

.contact__promise li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  line-height: 18px;
  color: var(--on-dark-4);
}

.dot {
  display: block;
  flex: 0 0 5px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-600);
}

/* 表单 */
.form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px;
  border-radius: var(--r-2xl);
  background: #fff;
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.65);
}

.form__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 24px;
  color: var(--ink-900);
}

.form__note {
  margin-top: -4px;
  font-size: 12px;
  line-height: 18px;
  color: var(--ink-400);
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field__label {
  font-size: 12px;
  font-weight: 500;
  line-height: 17px;
  color: var(--ink-600);
}

.field__input {
  width: 100%;
  height: 42px;
  padding: 0 14px;
  border-radius: var(--r-sm);
  background: var(--surface-input);
  border: 1px solid var(--line-light);
  font-family: inherit;
  font-size: 13px;
  line-height: 18px;
  color: var(--ink-900);
  transition: border-color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
  -webkit-appearance: none;
  appearance: none;
}

.field__input::placeholder {
  color: var(--ink-300);
}

.field__input:hover {
  border-color: #D3DEEA;
}

.field__input:focus {
  outline: none;
  background: #fff;
  border-color: var(--blue-600);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.12);
}

.field__input--area {
  height: auto;
  min-height: 76px;
  padding: 12px 14px;
  line-height: 20px;
  resize: none;
}

.field__select {
  position: relative;
}

.field__input--select {
  padding-right: 34px;
  color: var(--ink-900);
  cursor: pointer;
}

.field__input--select:invalid,
.field__input--select option[value=""] {
  color: var(--ink-300);
}

.field__chevron {
  position: absolute;
  top: 50%;
  right: 14px;
  transform: translateY(-50%);
  pointer-events: none;
}

.field__err {
  display: none;
  font-size: 11px;
  line-height: 15px;
  color: #D92D20;
}

.field.has-error .field__input {
  border-color: #F0A6A0;
  background: #FFF7F6;
}

.field.has-error .field__err {
  display: block;
}

.form__status {
  min-height: 0;
  font-size: 12.5px;
  line-height: 18px;
  color: var(--ink-500);
}

.form__status.is-ok {
  color: #0B7A3E;
}

.form__status.is-err {
  color: #D92D20;
}

.btn--block[disabled] {
  opacity: 0.62;
  cursor: not-allowed;
  transform: none !important;
}

/* ---------- 15. Footer ---------- */
.footer {
  background: var(--navy-950);
  padding: 30px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer__copy {
  font-size: 12.5px;
  line-height: 18px;
  color: var(--on-dark-6);
}

.footer__legal {
  font-size: 12px;
  line-height: 18px;
  // color: #51637A;
  color: var(--on-dark-6);
}

/* ---------- 16. 入场动画 ----------
   仅在 html.js 下隐藏初始状态：JS 不可用时内容直接可见，
   避免脚本失败导致整页空白。 */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* FAQ 折叠同样只在 JS 可用时生效 */
.js .faq__panel {
  max-height: 0;
  transition: max-height 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

.cards .reveal:nth-child(2),
.promise .reveal:nth-child(2),
.scenes .reveal:nth-child(2),
.steps .reveal:nth-child(2) { transition-delay: 0.06s; }

.cards .reveal:nth-child(3),
.promise .reveal:nth-child(3),
.scenes .reveal:nth-child(3),
.steps .reveal:nth-child(3) { transition-delay: 0.12s; }

.steps .reveal:nth-child(4) { transition-delay: 0.18s; }
.steps .reveal:nth-child(5) { transition-delay: 0.24s; }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1320px) {
  .hero__row { gap: 40px; }
  .arch { flex-basis: 440px; width: 440px; }
}

@media (max-width: 1180px) {
  .hero { padding: 64px 0 72px; }
  .hero__row { gap: 36px; }
  .hero__title { font-size: 40px; }
  .arch { flex-basis: 400px; width: 400px; padding: 24px; }
  .section-head__title { font-size: 30px; }
  .about__row { grid-template-columns: minmax(0, 1fr) 420px; gap: 48px; }
  .contact__row { grid-template-columns: minmax(0, 1fr) 420px; gap: 40px; }
}

@media (max-width: 1024px) {
  .nav { gap: 24px; }
  .nav__link { font-size: 13.5px; }

  .hero__row {
    flex-direction: column;
    align-items: stretch;
    gap: 44px;
  }

  .hero__sub { max-width: 640px; }

  .arch {
    flex: 0 0 auto;
    width: 100%;
    max-width: 560px;
    padding: 26px;
    margin: 0 auto;
  }

  .cards,
  .promise,
  .scenes {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card,
  .promise__col,
  .scene { min-height: 0; }

  .card__list { margin-top: 0; }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 20px;
  }

  .about__row,
  .contact__row {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about__right,
  .contact__right {
    width: 100%;
    max-width: 560px;
  }

  .form { padding: 24px; }
}

@media (max-width: 820px) {
  :root { --gutter: 20px; }

  html { scroll-padding-top: 84px; }

  .site-header__inner { height: 68px; }

  .nav-toggle { display: flex; }

  .nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    z-index: 99;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100dvh - 68px);
    overflow-y: auto;
    padding: 8px 20px 24px;
    background: rgba(10, 22, 40, 0.98);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line-dark);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  }

  .nav.is-open {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  /* 菜单展开时的遮罩，点击空白处收起 */
  body.nav-open {
    overflow: hidden;
  }

  body.nav-open::after {
    content: "";
    position: fixed;
    inset: 68px 0 0;
    z-index: 98;
    background: rgba(3, 8, 16, 0.58);
  }

  .nav__link {
    padding: 15px 4px;
    font-size: 15px;
    border-bottom: 1px solid var(--line-dark-2);
  }

  .nav__link::after { display: none; }

  .btn--nav {
    margin-top: 18px;
    width: 100%;
    padding: 13px 22px;
    font-size: 15px;
  }

  .hero { padding: 48px 0 60px; }
  .hero__title { font-size: clamp(28px, 7vw, 36px); line-height: 1.38; }
  .hero__sub { font-size: 14px; line-height: 26px; }
  .hero__cta { gap: 10px; }
  .hero__cta .btn { flex: 1 1 auto; justify-content: center; }

  .stats { padding: 30px 0; }
  .stats__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 26px 12px;
  }
  .stat__div { display: none; }
  .stat__num { font-size: 34px; line-height: 40px; }

  .section { padding: 60px 0; }
  .services { padding: 64px 0; }
  .section-head { margin-bottom: 32px; gap: 10px; }
  .section-head__title { font-size: 26px; line-height: 1.4; }
  .section-head__sub { font-size: 14px; line-height: 24px; }

  .steps { grid-template-columns: 1fr; gap: 22px; }

  .about__title,
  .contact__title { font-size: 24px; line-height: 34px; }

  .about__p,
  .contact__sub { font-size: 13.5px; line-height: 26px; }

  .faq__q { padding: 17px 0; font-size: 14px; gap: 16px; }
  .faq__panel > p { padding-right: 0; font-size: 13.5px; line-height: 25px; }

  .footer { padding: 24px 0; }
  .footer__inner { flex-direction: column; align-items: flex-start; gap: 8px; }
  .footer__legal { font-size: 11px; line-height: 17px; }
}

@media (max-width: 480px) {
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { width: 100%; }
  .form { padding: 20px; }
  .form__row { grid-template-columns: 1fr; }
  .about__right,
  .contact__right { max-width: 100%; }
  .creds__row { gap: 12px; }
  .creds__row dt { font-size: 12.5px; }
}

/* ---------- 18. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 19. 打印 ---------- */
@media print {
  .site-header,
  .nav-toggle,
  .skip-link,
  .hero__cta,
  .form {
    display: none !important;
  }

  body { background: #fff; }

  .hero,
  .stats,
  .about,
  .contact,
  .footer {
    background: #fff !important;
    color: #000 !important;
  }

  .hero__title,
  .about__title,
  .contact__title,
  .stat__num,
  .creds__row dt {
    color: #000 !important;
  }

  .reveal { opacity: 1 !important; transform: none !important; }
}