/* =============================================================
   原点数维 官网设计系统
   深空工程感 — 近黑深蓝 + 蓝青渐变 + 细网格 + 玻璃卡片
   ============================================================= */

/* ---- OD-LAYOUT-PRIMITIVES v1 — 布局原语（结构层，先行） ---- */
@layer od-layout {
  [hidden]:not([hidden="until-found" i]) { display: none !important; }
  dialog:not([open]) { display: none !important; }

  :where(.od-stack,.od-row,.od-row-top,.od-cluster,.od-grid,.od-field,.od-stat,.od-cell,.od-tile) > :where(*) { min-width: 0; }

  .od-stack   { display: flex; flex-direction: column; gap: var(--od-gap, 8px); }
  .od-row     { display: flex; align-items: center; gap: var(--od-gap, 8px); }
  .od-row-top { display: flex; align-items: flex-start; gap: var(--od-gap, 8px); }
  .od-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--od-gap, 8px); }
  .od-fill    { flex: 1 1 0; min-width: 0; }
  .od-fixed   { flex: none; }
  .od-grid    { display: grid; gap: var(--od-gap, 12px); grid-template-columns: repeat(var(--od-cols, 3), minmax(0, 1fr)); }

  .od-stat, .od-field, .od-cell { display: grid; gap: var(--od-gap, 2px); }
  :where(.od-stat,.od-field,.od-cell) > :where(*) { display: block; }
  .od-tile { display: grid; grid-template-rows: auto 1fr; }
  :where(.od-tile) > :where(*) { display: block; }

  .od-media { display: block; width: 100%; height: auto; aspect-ratio: var(--od-ratio, auto); }
  .od-media-cover { object-fit: cover; }

  .od-icon { display: inline-block; inline-size: var(--od-icon-size, 1em); block-size: var(--od-icon-size, 1em); flex: none; }

  .od-truncate { display: block; max-width: 100%; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
  .od-clamp-2, .od-clamp-3 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; overflow-wrap: anywhere; }
  .od-clamp-2 { -webkit-line-clamp: 2; }
  .od-clamp-3 { -webkit-line-clamp: 3; }
  .od-lines-2 { min-height: calc(2 * 1.4em); }
  .od-nowrap  { white-space: nowrap; }
  .od-keep    { word-break: keep-all; overflow-wrap: anywhere; }

  .od-screen { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; height: 100%; }
  .od-scroll { overflow-y: auto; overscroll-behavior: contain; min-height: 0; }

  .od-rail { display: flex; gap: var(--od-gap, 8px); overflow-x: auto; scroll-snap-type: x proximity; scrollbar-width: none;
             padding-inline: var(--od-rail-pad, 16px); scroll-padding-inline: var(--od-rail-pad, 16px); }
  .od-rail::-webkit-scrollbar { display: none; }
  :where(.od-rail) > :where(*) { flex: none; scroll-snap-align: start; }
  :where(.od-rail) > :where(:last-child) { margin-inline-end: var(--od-rail-pad, 16px); }

  .od-spacer { flex: none; visibility: hidden; pointer-events: none; }
  .od-touch  { min-width: 44px; min-height: 44px; }
}
:root [hidden]:where(:not([hidden="until-found" i])) { display: none; }
/* /OD-LAYOUT-PRIMITIVES v1 */

/* ---- 设计令牌 ---- */
:root {
  /* 色彩 */
  --ink-900: #0B1020;
  --ink-850: #0D1428;
  --ink-800: #0F172A;
  --ink-700: #16213B;
  --ink-600: #1E2A47;
  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-400: #94A3B8;
  --slate-300: #CBD5E1;
  --slate-200: #E2E8F0;
  --slate-100: #EDF1F7;
  --slate-50:  #F7F9FC;
  --white: #FFFFFF;

  --brand: #2563EB;
  --brand-700: #1D4ED8;
  --brand-800: #1E40AF;
  --cyan: #06B6D4;
  --cyan-700: #0891B2;
  --gold: #C9A227;
  --gold-600: #B08D1E;

  --link: #2563EB;

  /* 语义 */
  --text: #0B1020;
  --text-soft: #334155;
  --text-muted: #5B6B82;
  --bg: #FFFFFF;
  --bg-soft: #F7F9FC;
  --line: #E4E9F2;
  --line-strong: #D4DCE9;

  --on-dark: #F2F6FC;
  --on-dark-muted: #A9B6CC;
  --dark-line: rgba(255,255,255,0.10);

  /* 字阶 */
  --fs-display: clamp(2rem, 4.6vw, 3.5rem);   /* 32–56 */
  --fs-h2: clamp(1.75rem, 3.1vw, 2.5rem);     /* 28–40 */
  --fs-h3: 1.25rem;
  --fs-h4: 1.125rem;
  --fs-body: 1rem;
  --fs-sm: 0.9375rem;
  --fs-xs: 0.8125rem;

  --lh-body: 1.7;
  --lh-tight: 1.25;
  --lh-heading: 1.3;

  /* 间距（4/8 倍数） */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;
  --sp-24: 96px;

  /* 圆角 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.14), 0 4px 10px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 0 1px rgba(37, 99, 235, 0.18), 0 8px 28px rgba(37, 99, 235, 0.24);

  /* 动效 */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in: cubic-bezier(0.55, 0, 0.55, 0.2);
  --t-fast: 160ms;
  --t-base: 240ms;
  --t-slow: 360ms;

  /* 布局 */
  --container: 1200px;
  --header-h: 72px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
               "Source Han Sans SC", sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

h1, h2, h3, h4, h5, p { margin: 0; }
h1, h2, h3, h4 { line-height: var(--lh-heading); font-weight: 700; letter-spacing: -0.01em; }

button { font-family: inherit; font-size: inherit; cursor: pointer; }

::selection { background: rgba(37, 99, 235, 0.22); }

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

/* ---- 布局容器 ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

.section { padding-block: var(--sp-20); }
.section--soft { background: var(--bg-soft); }
.section--dark { background: var(--ink-900); color: var(--on-dark); }

.section-head { max-width: 720px; margin-bottom: var(--sp-12); }
.section-head--center { margin-inline: auto; text-align: center; }
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: var(--sp-4);
}
.section-eyebrow::before {
  content: "";
  width: 20px; height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
  border-radius: 2px;
}
.section-head--center .section-eyebrow::after {
  content: "";
  width: 20px; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--brand));
  border-radius: 2px;
}
.section-title { font-size: var(--fs-h2); color: var(--text); }
.section-lead { font-size: var(--fs-body); color: var(--text-muted); margin-top: var(--sp-4); }

/* 深色区域标题 */
.section--dark .section-title,
.section--dark .section-lead { color: var(--on-dark); }
.section--dark .section-lead { color: var(--on-dark-muted); }

/* ---- 顶部导航 ---- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(11, 16, 32, 0.82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--dark-line);
  color: var(--on-dark);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--on-dark);
  flex: none;
}
.brand:hover { color: var(--on-dark); }
.brand-mark {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.42);
  flex: none;
}
.brand-mark svg { width: 18px; height: 18px; }

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-inline: auto;
}
.main-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-inline: var(--sp-4);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--on-dark-muted);
  border-radius: var(--r-sm);
  transition: color var(--t-fast) var(--ease-out), background var(--t-fast) var(--ease-out);
}
.main-nav a:hover { color: var(--on-dark); background: rgba(255,255,255,0.06); }
.main-nav a[aria-current="page"] { color: var(--on-dark); background: rgba(255,255,255,0.08); }
.main-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%; transform: translateX(-50%);
  bottom: -4px; width: 20px; height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
  border-radius: 2px;
}
.main-nav a { position: relative; }

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 44px;
  padding-inline: var(--sp-5);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--white);
  background: linear-gradient(135deg, var(--brand), var(--cyan-700));
  border-radius: var(--r-pill);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.32);
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out);
  flex: none;
  white-space: nowrap;
}
.header-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(37, 99, 235, 0.42); }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--dark-line);
  border-radius: var(--r-sm);
  color: var(--on-dark);
  flex: none;
}
.nav-toggle svg { width: 22px; height: 22px; }

.mobile-nav {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 99;
  background: var(--ink-900);
  padding: var(--sp-4) var(--sp-6) var(--sp-8);
  overflow-y: auto;
}
.mobile-nav a {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding-inline: var(--sp-4);
  color: var(--on-dark-muted);
  font-size: var(--fs-body);
  font-weight: 500;
  border-bottom: 1px solid var(--dark-line);
}
.mobile-nav a[aria-current="page"] { color: var(--on-dark); }
.mobile-nav .mobile-cta {
  margin-top: var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  color: var(--white);
  font-weight: 600;
  background: linear-gradient(135deg, var(--brand), var(--cyan-700));
  border-radius: var(--r-md);
  border-bottom: none;
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 48px;
  padding: var(--sp-3) var(--sp-6);
  font-size: var(--fs-body);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out),
              background var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out),
              color var(--t-fast) var(--ease-out);
  white-space: nowrap;
  text-align: center;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--brand) 0%, var(--cyan-700) 100%);
  background-size: 150% 150%;
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.30);
}
.btn--primary:hover { transform: translateY(-2px); background-position: 100% 100%; box-shadow: 0 10px 26px rgba(37, 99, 235, 0.40); }

.btn--ghost {
  color: var(--on-dark);
  background: rgba(255,255,255,0.04);
  border-color: var(--dark-line);
}
.btn--ghost:hover { background: rgba(255,255,255,0.10); border-color: rgba(255,255,255,0.24); }

.btn--outline {
  color: var(--text);
  background: var(--white);
  border-color: var(--line-strong);
}
.btn--outline:hover { border-color: var(--brand); color: var(--brand); }

.btn--link {
  min-height: 0;
  padding: 0;
  background: none;
  border: none;
  color: var(--brand);
  font-weight: 600;
  gap: var(--sp-2);
}
.btn--link:hover { color: var(--brand-700); }
.btn--link .od-icon { transition: transform var(--t-fast) var(--ease-out); }
.btn--link:hover .od-icon { transform: translateX(3px); }

.btn .od-icon { --od-icon-size: 18px; }

/* ---- 首页 Hero ---- */
.hero {
  position: relative;
  padding-top: calc(var(--header-h) + var(--sp-16));
  padding-bottom: var(--sp-16);
  background: var(--ink-900);
  color: var(--on-dark);
  overflow: hidden;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148,163,184,0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,163,184,0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 0%, #000 30%, transparent 78%);
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}
.hero-glow--a {
  width: 520px; height: 520px;
  top: -160px; left: 8%;
  background: radial-gradient(circle, rgba(37,99,235,0.50), transparent 70%);
}
.hero-glow--b {
  width: 460px; height: 460px;
  top: -80px; right: 4%;
  background: radial-gradient(circle, rgba(6,182,212,0.40), transparent 70%);
}
.hero-inner { position: relative; z-index: 1; max-width: 860px; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding: var(--sp-2) var(--sp-4);
  border: 1px solid rgba(6,182,212,0.35);
  border-radius: var(--r-pill);
  background: rgba(6,182,212,0.08);
  margin-bottom: var(--sp-6);
}
.hero-eyebrow .od-icon { --od-icon-size: 14px; }
.hero-title {
  font-size: var(--fs-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--white);
}
.hero-title .grad {
  background: linear-gradient(120deg, var(--cyan), var(--brand) 55%, #8FA7FF);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero-subtitle {
  margin-top: var(--sp-6);
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--on-dark-muted);
  max-width: 640px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  margin-top: var(--sp-8);
}
.hero-trust {
  margin-top: var(--sp-12);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--dark-line);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3) var(--sp-8);
}
.hero-trust-item {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  color: var(--on-dark-muted);
  font-weight: 500;
}
.hero-trust-item .od-icon { --od-icon-size: 16px; color: var(--cyan); }

/* 淡入动效 */
.fade-up { opacity: 0; transform: translateY(18px); animation: fadeUp 0.6s var(--ease-out) forwards; }
.fade-up--1 { animation-delay: 0.05s; }
.fade-up--2 { animation-delay: 0.15s; }
.fade-up--3 { animation-delay: 0.25s; }
.fade-up--4 { animation-delay: 0.35s; }
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ---- 卡片 ---- */
.card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-8);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base) var(--ease-out), box-shadow var(--t-base) var(--ease-out),
              border-color var(--t-base) var(--ease-out);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--line-strong); }

.card-icon {
  width: 48px; height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(6,182,212,0.12));
  color: var(--brand);
  margin-bottom: var(--sp-5);
  --od-icon-size: 24px;
}
.card h3 { font-size: var(--fs-h3); margin-bottom: var(--sp-3); }
.card p { font-size: var(--fs-sm); color: var(--text-muted); line-height: 1.7; }

.card--dark {
  background: rgba(255,255,255,0.035);
  border-color: var(--dark-line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.card--dark:hover { border-color: rgba(255,255,255,0.2); }
.card--dark h3 { color: var(--on-dark); }
.card--dark p { color: var(--on-dark-muted); }

/* 能力卡网格 */
.capability-grid { --od-cols: 4; --od-gap: 20px; }
.capability-card { height: 100%; }

/* ---- 交付保障 ---- */
.guarantee-wrap { background: linear-gradient(180deg, var(--ink-900), var(--ink-850)); border-radius: var(--r-lg); overflow: hidden; }
.guarantee-inner { padding: var(--sp-16) var(--sp-12); }
.guarantee-grid { --od-cols: 3; --od-gap: 24px; }
.guarantee-item {
  display: flex;
  gap: var(--sp-4);
  align-items: flex-start;
}
.guarantee-num {
  flex: none;
  width: 32px; height: 32px;
  display: grid;
  place-items: center;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--cyan);
  border: 1px solid rgba(6,182,212,0.4);
  border-radius: 8px;
  background: rgba(6,182,212,0.08);
  margin-top: 2px;
}
.guarantee-item h4 { font-size: var(--fs-body); color: var(--on-dark); margin-bottom: var(--sp-2); }
.guarantee-item p { font-size: var(--fs-sm); color: var(--on-dark-muted); line-height: 1.65; }

/* ---- 技术方向 ---- */
.tech-tags { display: flex; flex-wrap: wrap; gap: var(--sp-3); }
.tech-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 44px;
  padding: var(--sp-2) var(--sp-5);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-soft);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  transition: border-color var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out),
              transform var(--t-fast) var(--ease-out);
}
.tech-tag:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); }
.tech-tag .od-icon { --od-icon-size: 18px; color: var(--brand); }

/* ---- 流程 ---- */
.steps { --od-cols: 5; --od-gap: 20px; }
.step {
  position: relative;
  padding-top: var(--sp-2);
}
.step-num {
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1;
  color: var(--slate-200);
  margin-bottom: var(--sp-3);
}
.step h3 { font-size: var(--fs-body); margin-bottom: var(--sp-2); }
.step p { font-size: var(--fs-sm); color: var(--text-muted); line-height: 1.6; }
.step::before {
  content: "";
  position: absolute;
  top: 12px; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
  opacity: 0.18;
}
.step .step-num { position: relative; background: var(--bg); display: inline-block; padding-right: var(--sp-4); }

/* ---- CTA 区块 ---- */
.cta {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--brand-800), var(--ink-900) 55%, var(--ink-850));
  color: var(--on-dark);
  padding: var(--sp-16) var(--sp-12);
  text-align: center;
}
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 0%, rgba(37,99,235,0.35), transparent 55%),
                    radial-gradient(circle at 80% 100%, rgba(6,182,212,0.30), transparent 55%);
  pointer-events: none;
}
.cta > * { position: relative; z-index: 1; }
.cta h2 { font-size: var(--fs-h2); color: var(--white); }
.cta p { margin: var(--sp-4) auto 0; max-width: 560px; color: var(--on-dark-muted); }
.cta-actions { display: flex; flex-wrap: wrap; gap: var(--sp-4); justify-content: center; margin-top: var(--sp-8); }

/* ---- 页脚 ---- */
.site-footer {
  background: var(--ink-900);
  color: var(--on-dark-muted);
  padding-block: var(--sp-16) var(--sp-8);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--sp-12);
  padding-bottom: var(--sp-12);
  border-bottom: 1px solid var(--dark-line);
}
.footer-brand .brand { margin-bottom: var(--sp-4); }
.footer-brand p { font-size: var(--fs-sm); line-height: 1.7; max-width: 340px; }
.footer-col h4 {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--on-dark);
  text-transform: uppercase;
  margin-bottom: var(--sp-5);
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--sp-3); }
.footer-col a {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  color: var(--on-dark-muted);
  min-height: 28px;
  transition: color var(--t-fast) var(--ease-out);
}
.footer-col a:hover { color: var(--on-dark); }
.footer-col a .od-icon { --od-icon-size: 16px; }
.footer-contact { display: grid; gap: var(--sp-3); }
.footer-contact li { display: flex; align-items: flex-start; gap: var(--sp-3); font-size: var(--fs-sm); }
.footer-contact .od-icon { --od-icon-size: 18px; color: var(--cyan); margin-top: 3px; flex: none; }
.footer-contact a { color: var(--on-dark); font-weight: 500; }

.footer-bottom {
  padding-top: var(--sp-8);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--on-dark-muted);
}
.footer-bottom a { color: var(--on-dark-muted); }
.footer-bottom a:hover { color: var(--on-dark); }
.footer-legal { display: flex; flex-wrap: wrap; gap: var(--sp-5); align-items: center; }

/* ---- 页面标题（内页 Hero） ---- */
.page-hero {
  position: relative;
  padding-top: calc(var(--header-h) + var(--sp-16));
  padding-bottom: var(--sp-16);
  background: var(--ink-900);
  color: var(--on-dark);
  overflow: hidden;
}
.page-hero .hero-grid-bg { mask-image: radial-gradient(ellipse 70% 70% at 50% 0%, #000 30%, transparent 75%); -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 0%, #000 30%, transparent 75%); }
.page-hero .hero-glow--a { opacity: 0.7; }
.page-hero .hero-glow--b { opacity: 0.7; }
.page-hero-inner { position: relative; z-index: 1; max-width: 760px; }
.page-hero h1 { font-size: var(--fs-display); font-weight: 800; color: var(--white); letter-spacing: -0.02em; }
.page-hero p { margin-top: var(--sp-5); font-size: 1.125rem; color: var(--on-dark-muted); line-height: 1.75; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  color: var(--on-dark-muted);
  margin-bottom: var(--sp-6);
}
.breadcrumb a { color: var(--on-dark-muted); }
.breadcrumb a:hover { color: var(--on-dark); }
.breadcrumb .od-icon { --od-icon-size: 14px; color: var(--slate-500); }

/* ---- 服务页 ---- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: var(--sp-12);
  padding-block: var(--sp-16);
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.service-block:last-child { border-bottom: none; }
.service-block-head .card-icon { margin-bottom: var(--sp-5); }
.service-block-head h2 { font-size: var(--fs-h2); margin-bottom: var(--sp-4); }
.service-block-head p { color: var(--text-muted); font-size: var(--fs-body); }
.service-fields { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
.service-field {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: var(--sp-5);
}
.service-field h3 {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--brand);
  margin-bottom: var(--sp-3);
}
.service-field h3 .od-icon { --od-icon-size: 16px; }
.service-field p { font-size: var(--fs-sm); color: var(--text-soft); line-height: 1.7; }
.service-field .kv { display: grid; gap: var(--sp-1); font-size: var(--fs-sm); }
.service-field .kv .k { font-weight: 600; color: var(--text); }

/* ---- 解决方案页 ---- */
.solution-grid { --od-cols: 3; --od-gap: 24px; }
.solution-card { height: 100%; }
.solution-card .card-icon { color: var(--brand); }
.solution-card ul {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}
.solution-card li {
  position: relative;
  padding-left: var(--sp-5);
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: 1.6;
}
.solution-card li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.65em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
}
.solution-note {
  margin-top: var(--sp-8);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-5) var(--sp-6);
  background: rgba(37,99,235,0.05);
  border: 1px solid rgba(37,99,235,0.18);
  border-radius: var(--r-md);
  color: var(--text-soft);
  font-size: var(--fs-sm);
}
.solution-note .od-icon { --od-icon-size: 20px; color: var(--brand); flex: none; }

/* ---- 关于我们 ---- */
.value-grid { --od-cols: 4; --od-gap: 20px; }
.value-card { height: 100%; text-align: left; }
.method-list { display: grid; gap: var(--sp-3); }
.method-item {
  display: flex;
  gap: var(--sp-4);
  align-items: flex-start;
  padding: var(--sp-5);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.method-item .card-icon { margin: 0; width: 40px; height: 40px; flex: none; --od-icon-size: 20px; }
.method-item h3 { font-size: var(--fs-body); margin-bottom: var(--sp-2); }
.method-item p { font-size: var(--fs-sm); color: var(--text-muted); line-height: 1.65; }
.promise-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--sp-3); }
.promise-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  font-size: var(--fs-body);
  color: var(--text-soft);
  line-height: 1.7;
}
.promise-list .od-icon { --od-icon-size: 20px; color: var(--brand); margin-top: 4px; flex: none; }

/* ---- 联系我们 ---- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: var(--sp-12);
  align-items: start;
}
.contact-info { display: grid; gap: var(--sp-4); }
.contact-item {
  display: flex;
  gap: var(--sp-4);
  align-items: flex-start;
  padding: var(--sp-5);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.contact-item .card-icon { margin: 0; width: 40px; height: 40px; flex: none; --od-icon-size: 20px; }
.contact-item h3 { font-size: var(--fs-sm); font-weight: 700; color: var(--text); margin-bottom: var(--sp-1); }
.contact-item p, .contact-item a { font-size: var(--fs-sm); color: var(--text-soft); }
.contact-item a { color: var(--brand); font-weight: 600; }
.response-note {
  margin-top: var(--sp-3);
  padding: var(--sp-4) var(--sp-5);
  font-size: var(--fs-sm);
  color: var(--text-soft);
  background: rgba(201,162,39,0.08);
  border: 1px solid rgba(201,162,39,0.30);
  border-radius: var(--r-md);
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
}
.response-note .od-icon { --od-icon-size: 18px; color: var(--gold-600); margin-top: 3px; flex: none; }

/* ---- 表单 ---- */
.form-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-8);
  box-shadow: var(--shadow-md);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-5); }
.form-field { display: grid; gap: var(--sp-2); }
.form-field--full { grid-column: 1 / -1; }
.form-field label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text);
}
.form-field label .req { color: #DC2626; }
.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  min-height: 48px;
  padding: var(--sp-3) var(--sp-4);
  font-family: inherit;
  font-size: var(--fs-body);
  color: var(--text);
  background: var(--white);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  transition: border-color var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out);
}
.form-field textarea { min-height: 132px; resize: vertical; line-height: 1.6; }
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}
.form-field input[aria-invalid="true"],
.form-field textarea[aria-invalid="true"] {
  border-color: #DC2626;
}
.form-field .hint { font-size: var(--fs-xs); color: var(--text-muted); }
.form-field .error {
  font-size: var(--fs-xs);
  color: #DC2626;
  min-height: 1em;
}
.form-field .error:empty { display: none; }
.form-submit {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.form-status {
  display: none;
  align-items: flex-start;
  gap: var(--sp-2);
  padding: var(--sp-4);
  font-size: var(--fs-sm);
  border-radius: var(--r-sm);
}
.form-status--success { display: flex; color: #065F46; background: #ECFDF5; border: 1px solid #A7F3D0; }
.form-status--error { display: flex; color: #991B1B; background: #FEF2F2; border: 1px solid #FECACA; }
.form-status .od-icon { --od-icon-size: 18px; flex: none; margin-top: 1px; }
.consent { grid-column: 1 / -1; font-size: var(--fs-xs); color: var(--text-muted); line-height: 1.6; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .capability-grid, .solution-grid, .guarantee-grid, .value-grid { --od-cols: 2; }
  .steps { --od-cols: 3; }
  .contact-layout { grid-template-columns: 1fr; }
  .service-block { grid-template-columns: 1fr; gap: var(--sp-8); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }
  .section { padding-block: var(--sp-16); }
  .main-nav { display: none; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  /* 修复：JS 移除 hidden 后需恢复显示，否则移动菜单永不出现（原型遗漏） */
  .mobile-nav:not([hidden]) { display: block; }
  .site-header .container { gap: var(--sp-4); }
  .brand { margin-inline-end: auto; }
  .capability-grid, .solution-grid, .guarantee-grid, .value-grid { --od-cols: 1; }
  .steps { --od-cols: 1; gap: var(--sp-8); }
  .step::before { display: none; }
  .service-fields { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .form-field--full, .form-submit, .consent { grid-column: auto; }
  .footer-top { grid-template-columns: 1fr; gap: var(--sp-8); }
  .guarantee-inner { padding: var(--sp-10) var(--sp-6); }
  .cta { padding: var(--sp-12) var(--sp-6); }
  .hero-actions .btn { width: 100%; }
  .btn { padding-inline: var(--sp-5); }
  .contact-layout { gap: var(--sp-8); }
  .form-card { padding: var(--sp-6); }
}

/* ---- 减少动效 ---- */
@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;
  }
  .fade-up { opacity: 1; transform: none; }
}