/* ==========================================================================
   寒松智能科技 · 官网设计系统
   Design tokens + base + components
   ========================================================================== */

:root {
  /* 品牌色：深松绿 + 冷调蓝绿，呼应"寒松"的坚韧与科技感 */
  --brand-900: #04161a;
  --brand-800: #072a30;
  --brand-700: #0b3d45;
  --brand-600: #0f5560;
  --brand-500: #12707d;
  --brand-400: #1b8b99;
  --brand-300: #38aab8;
  --brand-200: #6fcdd6;
  --brand-100: #b3e5ea;
  --brand-50: #e8f7f9;

  --accent-aurora: #3ba5c8;
  --accent-mist: #6f8fd6;
  --accent-ember: #d98b4a;
  --accent-violet: #8b6fd1;

  /* 中性色：偏冷的灰阶，与品牌色协调 */
  --ink-900: #0b1417;
  --ink-800: #16252a;
  --ink-700: #2b3f46;
  --ink-600: #47595f;
  --ink-500: #6b7f86;
  --ink-400: #93a5ab;
  --ink-300: #c2ced2;
  --ink-200: #dde5e8;
  --ink-100: #eef3f5;
  --ink-50: #f6f9fa;
  --white: #ffffff;

  --bg: var(--white);
  --bg-tint: var(--ink-50);

  --text: var(--ink-800);
  --text-muted: var(--ink-500);
  --text-soft: var(--ink-400);
  --heading: var(--ink-900);
  --border: var(--ink-200);
  --border-strong: var(--ink-300);

  /* 字体：优先系统中文字体，保证首屏渲染速度（LCP ≤ 2.5s） */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* 间距与圆角 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 26px;
  --r-full: 999px;

  --shadow-xs: 0 1px 2px rgba(11, 20, 23, .05);
  --shadow-sm: 0 2px 8px rgba(11, 20, 23, .06), 0 1px 2px rgba(11, 20, 23, .04);
  --shadow-md: 0 8px 24px rgba(11, 20, 23, .08), 0 2px 6px rgba(11, 20, 23, .04);
  --shadow-lg: 0 20px 50px rgba(11, 20, 23, .12), 0 6px 16px rgba(11, 20, 23, .05);
  --shadow-brand: 0 10px 30px rgba(18, 112, 125, .22);

  --container: 1200px;
  --nav-h: 68px;

  --ease: cubic-bezier(.4, 0, .2, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, h4, h5 { margin: 0; color: var(--heading); line-height: 1.25; font-weight: 700; letter-spacing: -.02em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

::selection { background: var(--brand-200); color: var(--brand-900); }

:focus-visible {
  outline: 2px solid var(--brand-400);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 104px 0; }
.section--tight { padding: 72px 0; }
.section--tint { background: var(--bg-tint); }
.section--dark { background: var(--brand-900); color: var(--brand-100); }
.section--dark h2, .section--dark h3 { color: var(--white); }

.section-head {
  max-width: 680px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-head--left { margin-left: 0; text-align: left; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--brand-500);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand-400), transparent);
}
.section--dark .eyebrow { color: var(--brand-200); }

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 16px;
}
.section-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.8;
}
.section--dark .section-desc { color: var(--brand-100); opacity: .8; }

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

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--brand-600);
  --btn-fg: var(--white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: var(--r-full);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .25s var(--ease-out), box-shadow .25s var(--ease-out), background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
  white-space: nowrap;
  user-select: none;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-brand); }
.btn:active { transform: translateY(0); }

.btn--primary { --btn-bg: linear-gradient(135deg, var(--brand-500), var(--brand-700)); }
.btn--primary:hover { box-shadow: 0 14px 34px rgba(18, 112, 125, .3); }

.btn--ghost { --btn-bg: transparent; --btn-fg: var(--brand-700); border-color: var(--border-strong); }
.btn--ghost:hover { --btn-bg: var(--brand-50); border-color: var(--brand-300); box-shadow: var(--shadow-sm); }

.btn--onDark { --btn-bg: rgba(255,255,255,.1); --btn-fg: var(--white); border-color: rgba(255,255,255,.28); backdrop-filter: blur(8px); }
.btn--onDark:hover { --btn-bg: rgba(255,255,255,.18); box-shadow: 0 12px 30px rgba(0,0,0,.3); }

.btn--white { --btn-bg: var(--white); --btn-fg: var(--brand-800); }
.btn--sm { padding: 9px 18px; font-size: 14px; }
.btn--lg { padding: 16px 34px; font-size: 16px; }
.btn--block { width: 100%; }

.btn[disabled], .btn.is-loading { opacity: .6; pointer-events: none; }

/* ---------- Header / Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: transparent;
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-xs);
}

.nav__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
/* 品牌标志为位图（favicon 同源），无需容器底色 */
.brand__mark {
  width: 38px; height: 38px; flex-shrink: 0;
  border-radius: 10px;
  display: block;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-size: 16.5px; font-weight: 700; color: var(--heading); letter-spacing: -.01em; }
.brand__sub { font-size: 10.5px; color: var(--text-soft); letter-spacing: .1em; text-transform: uppercase; font-weight: 600; }

.nav__links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav__link {
  position: relative;
  padding: 8px 14px;
  border-radius: var(--r-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-600);
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.nav__link:hover { color: var(--brand-700); background: var(--ink-100); }
.nav__link.is-active { color: var(--brand-700); font-weight: 600; }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--brand-500);
}
.nav__actions { display: flex; align-items: center; gap: 10px; }

.nav__toggle {
  display: none;
  width: 42px; height: 42px;
  align-items: center; justify-content: center;
  margin-left: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--white);
  cursor: pointer;
}
.nav__toggle span {
  display: block;
  width: 18px; height: 1.8px;
  background: var(--ink-800);
  border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.nav__toggle span + span { margin-top: 4.5px; }
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(6.3px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-6.3px) rotate(-45deg); }

/* 移动端菜单展开时强制浅色面板 + 深色文字（优先级需高于 .nav:not(.is-stuck) 规则） */
@media (max-width: 900px) {
  .nav.is-open:not(.is-stuck) .nav__link,
  .nav.is-open:not(.is-stuck) .nav__link:hover,
  .nav.is-open:not(.is-stuck) .nav__link.is-active {
    color: var(--ink-600);
  }
  .nav.is-open:not(.is-stuck) .nav__link.is-active { color: var(--brand-700); }
  .nav.is-open:not(.is-stuck) .nav__link:hover { background: var(--ink-100); }
}
.nav:not(.is-stuck) .brand__name { color: var(--white); }
.nav:not(.is-stuck) .brand__sub { color: rgba(255,255,255,.55); }
.nav:not(.is-stuck) .nav__link { color: rgba(255,255,255,.82); }
.nav:not(.is-stuck) .nav__link:hover { color: var(--white); background: rgba(255,255,255,.1); }
.nav:not(.is-stuck) .nav__link.is-active { color: var(--white); }
.nav:not(.is-stuck) .nav__link.is-active::after { background: var(--brand-200); }

/* 移动端菜单展开时强制浅色面板 */
@media (max-width: 900px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 16px 24px 24px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .25s var(--ease), transform .25s var(--ease-out), visibility .25s;
  }
  .nav.is-open .nav__links { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav.is-open .nav__link { color: var(--ink-600); }
  .nav.is-open .nav__link:hover { color: var(--brand-700); background: var(--ink-100); }
  .nav__link { padding: 12px 14px; font-size: 16px; }
  .nav__link.is-active::after { display: none; }
  .nav__actions { display: none; }
  .nav__toggle { display: flex; flex-direction: column; }
  .nav:not(.is-stuck) .nav__toggle { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.3); }
  .nav:not(.is-stuck) .nav__toggle span { background: var(--white); }
}

/* ---------- Hero ---------- */
/* 注意：hero 的垂直内边距由各页 .hero__slide 自行承担（轮播层为绝对定位），
   .hero 本身不设 padding，避免高度被双重放大 */
.hero {
  position: relative;
  min-height: min(100svh, 780px);
  display: flex;
  align-items: stretch;
  background: var(--brand-900);
  overflow: hidden;
  isolation: isolate;
}
.hero__bg { position: absolute; inset: 0; z-index: -2; }
.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .5;
  z-index: -1;
  animation: drift 22s var(--ease) infinite alternate;
}
.hero__glow--a { width: 620px; height: 620px; top: -180px; right: -120px; background: radial-gradient(circle, rgba(56,170,184,.55), transparent 68%); }
.hero__glow--b { width: 520px; height: 520px; bottom: -200px; left: -140px; background: radial-gradient(circle, rgba(107,141,214,.42), transparent 68%); animation-delay: -8s; }
.hero__glow--c { width: 400px; height: 400px; top: 40%; left: 42%; background: radial-gradient(circle, rgba(139,111,209,.3), transparent 70%); animation-delay: -15s; }

@keyframes drift {
  from { transform: translate3d(0,0,0) scale(1); }
  to   { transform: translate3d(40px, 30px, 0) scale(1.12); }
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 35%, transparent 78%);
}

.hero__inner { position: relative; max-width: 780px; }
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 8px;
  margin-bottom: 28px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--r-full);
  background: rgba(255,255,255,.07);
  backdrop-filter: blur(10px);
  font-size: 13.5px;
  color: var(--brand-100);
}
.hero__badge b { color: var(--white); font-weight: 600; }
.hero__dot {
  width: 22px; height: 22px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-300), var(--brand-500));
}
.hero__dot i { width: 6px; height: 6px; border-radius: 50%; background: var(--white); }

.hero__title {
  font-size: clamp(36px, 6.4vw, 68px);
  line-height: 1.08;
  color: var(--white);
  letter-spacing: -.035em;
  margin-bottom: 24px;
}
.hero__title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--brand-200) 10%, #9fd8ff 50%, var(--accent-mist) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__desc {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.8;
  color: rgba(226, 244, 246, .82);
  max-width: 620px;
  margin-bottom: 40px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 56px; }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  justify-content: start;
  gap: 40px;
  padding-top: 36px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.hero__stat b {
  display: block;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -.02em;
  line-height: 1.2;
}
.hero__stat span { font-size: 13.5px; color: rgba(226,244,246,.62); }

@media (max-width: 640px) {
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 24px 20px; }
}

/* 滚动提示 */
.hero__scroll {
  position: absolute;
  left: 50%; bottom: 28px;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(226,244,246,.5);
}
.hero__scroll i {
  width: 1px; height: 34px;
  background: linear-gradient(180deg, rgba(226,244,246,.6), transparent);
  animation: scrollHint 2.2s var(--ease) infinite;
}
@keyframes scrollHint {
  0%, 100% { transform: scaleY(.4); transform-origin: top; opacity: .4; }
  50% { transform: scaleY(1); transform-origin: top; opacity: 1; }
}
@media (max-width: 640px) { .hero__scroll { display: none; } }

/* ---------- Trust bar ---------- */
.trust {
  padding: 30px 0;
  background: var(--ink-50);
  border-bottom: 1px solid var(--border);
}
.trust__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 40px;
}
.trust__item {
  display: flex; align-items: center; gap: 9px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-600);
}
.trust__item svg { color: var(--brand-500); flex-shrink: 0; }

/* ---------- Cards ---------- */
.card {
  position: relative;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--white);
  transition: transform .3s var(--ease-out), box-shadow .3s var(--ease-out), border-color .3s var(--ease);
  overflow: hidden;
}
.card--hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand-200);
}
.card__icon {
  width: 50px; height: 50px;
  display: grid; place-items: center;
  margin-bottom: 20px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--brand-50), var(--brand-100));
  color: var(--brand-600);
  transition: transform .3s var(--ease-out);
}
.card--hover:hover .card__icon { transform: scale(1.06) rotate(-4deg); }
/* 品牌图标为自绘矢量位图（自带深色圆角底），不叠加容器底色 */
.card__icon--brand { background: none; }
.card__icon-img {
  width: 100%; height: 100%;
  display: block;
  border-radius: var(--r-md);
  object-fit: contain;
  /* 源 SVG 自带安全边距，此处放大以填满容器 */
  transform: scale(1.18);
}
.card--hover:hover .card__icon-img { transform: scale(1.24) rotate(-4deg); }
.card__title { font-size: 18px; margin-bottom: 10px; }
.card__text { font-size: 15px; color: var(--text-muted); line-height: 1.75; }

.card__link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 18px;
  font-size: 14.5px; font-weight: 600;
  color: var(--brand-600);
}
.card__link svg { transition: transform .25s var(--ease-out); }
.card__link:hover svg { transform: translateX(4px); }

/* 卡片顶部彩条 */
.card--accent::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-400), var(--brand-200));
  opacity: 0;
  transition: opacity .3s var(--ease);
}
.card--accent:hover::before { opacity: 1; }

/* ---------- Product card ---------- */
.product {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.product__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
.product__badge {
  padding: 4px 11px;
  border-radius: var(--r-full);
  background: var(--brand-50);
  color: var(--brand-600);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .02em;
  white-space: nowrap;
}
.product__ver { font-family: var(--font-mono); font-size: 12px; color: var(--text-soft); }
.product__name { font-size: 21px; margin-bottom: 6px; }
.product__tagline { font-size: 14px; color: var(--brand-600); font-weight: 500; margin-bottom: 12px; }
.product__summary { font-size: 14.5px; color: var(--text-muted); line-height: 1.75; margin-bottom: 20px; }
.product__feats { display: flex; flex-direction: column; gap: 9px; margin-bottom: 24px; }
.product__feat {
  display: flex; align-items: flex-start; gap: 9px;
  font-size: 14px;
  color: var(--ink-600);
  line-height: 1.6;
}
.product__feat svg { flex-shrink: 0; margin-top: 4px; color: var(--brand-400); }
.product__foot {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.price { display: flex; align-items: baseline; gap: 8px; }
.price__now {
  font-size: 25px; font-weight: 700;
  color: var(--heading);
  letter-spacing: -.02em;
}
.price__now small { font-size: 14px; font-weight: 600; margin-right: 2px; }
.price__was { font-size: 14px; color: var(--text-soft); text-decoration: line-through; }
.price__free { font-size: 21px; font-weight: 700; color: var(--brand-600); }

/* ---------- Split / feature rows ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}
.split--reverse .split__media { order: -1; }
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split--reverse .split__media { order: 0; }
}

.feature-list { display: flex; flex-direction: column; gap: 24px; margin-top: 32px; }
.feature-list__item { display: flex; gap: 16px; }
.feature-list__num {
  flex-shrink: 0;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--brand-50);
  color: var(--brand-600);
  font-size: 14px; font-weight: 700;
  font-family: var(--font-mono);
}
.feature-list__body h4 { font-size: 16.5px; margin-bottom: 6px; }
.feature-list__body p { font-size: 14.5px; color: var(--text-muted); line-height: 1.75; }

/* 深色区块内的编号与正文提亮，保证对比度 */
.section--dark .feature-list__num {
  background: rgba(56, 170, 184, .18);
  color: var(--brand-200);
}
.section--dark .feature-list__body p { color: rgba(226, 244, 246, .74); }
.section--dark .step::before { color: var(--brand-200); }
.section--dark .step p { color: rgba(226, 244, 246, .7); }
.section--dark .step::after { background: linear-gradient(90deg, rgba(111,205,214,.4), transparent); }

/* 可视化面板（纯 CSS 绘制，无需图片） */
.panel {
  position: relative;
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
  background: var(--white);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.panel__bar {
  display: flex; align-items: center; gap: 7px;
  padding: 13px 18px;
  background: var(--ink-50);
  border-bottom: 1px solid var(--border);
}
.panel__bar i { width: 10px; height: 10px; border-radius: 50%; }
.panel__bar i:nth-child(1) { background: #ff5f57; }
.panel__bar i:nth-child(2) { background: #febc2e; }
.panel__bar i:nth-child(3) { background: #28c840; }
.panel__bar span { margin-left: 8px; font-size: 12.5px; color: var(--text-soft); font-family: var(--font-mono); }
.panel__body { padding: 24px; }

.flow { display: flex; flex-direction: column; gap: 10px; }
.flow__node {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--ink-50);
  transition: all .3s var(--ease-out);
}
.flow__node:hover { border-color: var(--brand-300); background: var(--brand-50); transform: translateX(4px); }
.flow__key {
  flex-shrink: 0;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--white);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--brand-600);
}
.flow__label { font-size: 14.5px; font-weight: 500; }
.flow__arrow { align-self: center; color: var(--brand-300); }
.flow__tag {
  margin-left: auto;
  font-size: 11.5px;
  color: var(--text-soft);
  font-family: var(--font-mono);
}

/* 指标块 */
.metrics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.metric {
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--ink-50);
  border: 1px solid var(--border);
}
.metric b { display: block; font-size: 26px; font-weight: 700; color: var(--brand-600); letter-spacing: -.02em; }
.metric span { font-size: 13px; color: var(--text-muted); }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
@media (max-width: 980px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

.step { position: relative; padding-top: 30px; }
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 0; left: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--brand-400);
  letter-spacing: .06em;
}
.step::after {
  content: "";
  position: absolute;
  top: 9px; left: 40px; right: -20px;
  height: 1px;
  background: linear-gradient(90deg, var(--brand-200), transparent);
}
.step:last-child::after { display: none; }
.step h4 { font-size: 16.5px; margin-bottom: 8px; }
.step p { font-size: 14.5px; color: var(--text-muted); line-height: 1.75; }
@media (max-width: 560px) { .step::after { display: none; } }

/* ---------- CTA ---------- */
.cta {
  position: relative;
  padding: 76px 48px;
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, var(--brand-800), var(--brand-600) 55%, var(--brand-500));
  color: var(--white);
  text-align: center;
  overflow: hidden;
  isolation: isolate;
}
.cta::before {
  content: "";
  position: absolute;
  width: 460px; height: 460px;
  top: -180px; right: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.14), transparent 68%);
  z-index: -1;
}
.cta::after {
  content: "";
  position: absolute;
  width: 380px; height: 380px;
  bottom: -160px; left: -100px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.1), transparent 70%);
  z-index: -1;
}
.cta h2 { color: var(--white); font-size: clamp(24px, 3.6vw, 36px); margin-bottom: 14px; }
.cta p { font-size: 16.5px; color: rgba(255,255,255,.82); max-width: 560px; margin: 0 auto 32px; line-height: 1.75; }
.cta__actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ---------- Form ---------- */
.form { display: grid; gap: 18px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 620px) { .form__row { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 7px; }
.field__label { font-size: 14px; font-weight: 500; color: var(--ink-700); }
.field__label .req { color: var(--accent-ember); margin-left: 2px; }
.field__control {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--white);
  font-size: 15px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.field__control::placeholder { color: var(--text-soft); }
.field__control:focus {
  outline: none;
  border-color: var(--brand-400);
  box-shadow: 0 0 0 3px rgba(56,170,184,.16);
}
textarea.field__control { resize: vertical; min-height: 108px; line-height: 1.65; }
select.field__control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%236b7f86' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 38px;
}
.field__error { font-size: 13px; color: #c0392b; min-height: 0; }
.field.has-error .field__control { border-color: #e08b80; }

.form__note { font-size: 13px; color: var(--text-soft); line-height: 1.65; }
.form__status { font-size: 14.5px; font-weight: 500; min-height: 22px; }
.form__status.is-ok { color: #1a7f5a; }
.form__status.is-err { color: #c0392b; }

/* 提交中 spinner */
.btn.is-loading { position: relative; color: transparent !important; }
.btn.is-loading::after {
  content: "";
  position: absolute;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,.35);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Footer ---------- */
.footer {
  padding: 72px 0 32px;
  background: var(--brand-900);
  color: var(--brand-100);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
@media (max-width: 900px) { .footer__grid { grid-template-columns: 1fr 1fr; gap: 36px; } }
@media (max-width: 560px) { .footer__grid { grid-template-columns: 1fr; } }

.footer .brand__name { color: var(--white); }
.footer .brand__sub { color: rgba(255,255,255,.5); }
.footer__about { font-size: 14px; line-height: 1.8; color: rgba(226,244,246,.62); margin-top: 18px; max-width: 320px; }
.footer__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 18px;
  letter-spacing: .04em;
}
.footer__list { display: flex; flex-direction: column; gap: 11px; }
.footer__list a, .footer__list li { font-size: 14px; color: rgba(226,244,246,.62); transition: color .2s var(--ease); }
.footer__list a:hover { color: var(--brand-200); }
.footer__contact { display: flex; flex-direction: column; gap: 12px; }
.footer__contact li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: rgba(226,244,246,.62); line-height: 1.6; }
.footer__contact svg { flex-shrink: 0; margin-top: 4px; color: var(--brand-300); }
.footer__bottom {
  padding-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(226,244,246,.45);
}
.footer__legal { display: flex; gap: 20px; flex-wrap: wrap; }
.footer__legal a:hover { color: var(--brand-200); }

/* ICP 备案号：工信部要求可点击跳转查询页 */
.footer__icp {
  color: rgba(226,244,246,.55);
  text-decoration: none;
  transition: color .18s ease;
}
.footer__icp:hover { color: var(--brand-200); }
.footer__sep { color: rgba(226,244,246,.25); }
/* 未填备案号时由 JS 隐藏 */
.footer__icp[hidden] { display: none; }

/* ---------- Page hero (内页) ---------- */
.page-hero {
  position: relative;
  padding: calc(var(--nav-h) + 88px) 0 88px;
  background: var(--brand-900);
  color: var(--white);
  overflow: hidden;
  isolation: isolate;
}
.page-hero::before {
  content: "";
  position: absolute;
  width: 620px; height: 620px;
  top: -280px; right: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56,170,184,.35), transparent 68%);
  z-index: -1;
}
.page-hero__inner { max-width: 720px; }
.page-hero h1 {
  font-size: clamp(30px, 5vw, 50px);
  color: var(--white);
  margin-bottom: 18px;
  letter-spacing: -.03em;
}
.page-hero p { font-size: 17px; line-height: 1.8; color: rgba(226,244,246,.78); }

.crumbs { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; font-size: 13.5px; color: rgba(226,244,246,.55); }
.crumbs a:hover { color: var(--brand-200); }
.crumbs span { opacity: .5; }

/* ---------- Reveal on scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
}
[data-reveal].is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .section { padding: 76px 0; }
  .grid-3 { grid-template-columns: 1fr; }
  .cta { padding: 56px 26px; }
}
@media (max-width: 640px) {
  .container { padding: 0 18px; }
  .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 62px 0; }
  .section-head { margin-bottom: 40px; }
  .card { padding: 26px; }
}

/* 打印 */
@media print {
  .nav, .hero__scroll, .cta { display: none; }
  body { color: #000; }
}