/**
 * [INPUT]: 依赖 index.html 的区块类名结构、assets/vendor/(swiper/aos) 的类名
 * [OUTPUT]: 对外提供全站深色科技风样式与响应式断点(1024/768/560)
 * [POS]: css 模块唯一样式文件,消费 index.html 结构,与 js/main.js 的状态类名协同(.scrolled/.open/.show/.active)
 * [PROTOCOL]: 变更时更新此头部,然后检查 CLAUDE.md
 *
 * 三岔口科技官网 · 主样式
 * 深色科技风 | 蓝紫青渐变 | 三线交汇视觉母题
 */

/* ---------- 设计令牌 ---------- */
:root {
  --bg: #05070f;
  --bg-soft: #090d1a;
  --bg-panel: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  --text: #e8ecf4;
  --text-dim: #8a94a8;
  --text-faint: #5c6577;

  --blue: #3b82f6;
  --purple: #8b5cf6;
  --cyan: #22d3ee;

  --grad: linear-gradient(120deg, var(--blue), var(--purple) 50%, var(--cyan));

  --header-h: 76px;
  --radius: 16px;
  --radius-sm: 10px;

  --shadow-glow: 0 8px 32px rgba(59, 130, 246, 0.28);
  --shadow-card: 0 16px 40px rgba(0, 0, 0, 0.4);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 重置与基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul,
ol {
  list-style: none;
}

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

/* 防止组件级 display 声明覆盖 hidden 属性 */
[hidden] {
  display: none !important;
}

::selection {
  background: rgba(139, 92, 246, 0.45);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.22);
}

/* ---------- 通用 ---------- */
.container {
  width: min(1200px, 92%);
  margin-inline: auto;
}

.section {
  position: relative;
  padding: clamp(72px, 9vw, 120px) 0;
}

.section-head {
  max-width: 720px;
  margin: 0 auto clamp(48px, 6vw, 72px);
  text-align: center;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.35em;
  color: var(--cyan);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.section-desc {
  margin-top: 16px;
  color: var(--text-dim);
  font-size: clamp(14px, 1.6vw, 16px);
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: transform 0.25s ease, box-shadow 0.25s ease,
    border-color 0.25s ease, background-color 0.25s ease;
  will-change: transform;
}

.btn svg {
  width: 17px;
  height: 17px;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(139, 92, 246, 0.42);
}

.btn-ghost {
  border: 1px solid var(--border-strong);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}

.btn-ghost:hover {
  border-color: rgba(34, 211, 238, 0.55);
  background: rgba(34, 211, 238, 0.06);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 16px;
}

.btn-sm {
  padding: 9px 22px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

/* ---------- 导航栏 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  height: var(--header-h);
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease,
    backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(5, 7, 15, 0.82);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 38px;
  height: 38px;
  flex: none;
  filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.5));
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.brand-en {
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--text-faint);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 34px);
}

.nav-link {
  position: relative;
  font-size: 15px;
  color: var(--text-dim);
  padding: 6px 2px;
  transition: color 0.25s ease;
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: translateX(-50%);
  transition: width 0.28s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-cta {
  margin-left: 8px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 48px) 0 72px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}

.hero-glow-1 {
  width: 560px;
  height: 560px;
  top: -180px;
  left: -160px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.22), transparent 65%);
}

.hero-glow-2 {
  width: 640px;
  height: 640px;
  bottom: -260px;
  right: -180px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.18), transparent 65%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 75%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.15);
  animation: badgePulse 2.2s ease-in-out infinite;
}

@keyframes badgePulse {
  0%,
  100% {
    box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.15);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(34, 211, 238, 0.05);
  }
}

.hero-title {
  margin-top: 26px;
  font-size: clamp(38px, 5.6vw, 66px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 0.02em;
}

.hero-subtitle {
  margin-top: 24px;
  max-width: 540px;
  color: var(--text-dim);
  font-size: clamp(15px, 1.7vw, 17px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-top: 44px;
}

.hero-meta li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--text-dim);
}

.hero-meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--grad);
}

/* --- Hero 三线交汇图形 --- */
.hero-art {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-svg {
  width: min(560px, 100%);
  height: auto;
  animation: heroFloat 7s ease-in-out infinite;
}

@keyframes heroFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-14px);
  }
}

.converge-base {
  stroke-width: 2.5;
  stroke-linecap: round;
  opacity: 0.22;
}

.converge-path {
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 7 11;
  opacity: 0.85;
  animation: dashFlow 1.1s linear infinite;
}

@keyframes dashFlow {
  to {
    stroke-dashoffset: -18;
  }
}

.end-dot {
  filter: drop-shadow(0 0 8px currentColor);
  animation: endBlink 2.6s ease-in-out infinite;
}

.ed1 {
  fill: var(--blue);
  color: var(--blue);
}

.ed2 {
  fill: var(--cyan);
  color: var(--cyan);
}

.ed3 {
  fill: var(--purple);
  color: var(--purple);
}

@keyframes endBlink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.orbit {
  stroke: rgba(255, 255, 255, 0.07);
  stroke-width: 1;
}

.orbit-dashed {
  stroke-dasharray: 3 7;
  animation: orbitSpin 40s linear infinite;
  transform-origin: 320px 290px;
}

@keyframes orbitSpin {
  to {
    transform: rotate(360deg);
  }
}

.node-pulse {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.5;
  animation: nodePulse 2.6s ease-out infinite;
}

.np2 {
  animation-delay: 1.3s;
}

@keyframes nodePulse {
  0% {
    r: 10;
    opacity: 0.85;
  }
  100% {
    r: 52;
    opacity: 0;
  }
}

.node-core {
  fill: #f5f8ff;
  filter: drop-shadow(0 0 14px rgba(34, 211, 238, 0.9));
}

.svg-label {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 500;
  fill: var(--text-dim);
  letter-spacing: 0.1em;
}

.svg-label-strong {
  fill: var(--text);
  font-weight: 700;
  letter-spacing: 0.24em;
}

/* ---------- 服务方向 ---------- */
.services {
  background:
    radial-gradient(ellipse 60% 40% at 85% 0%, rgba(139, 92, 246, 0.07), transparent),
    var(--bg-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.service-card {
  position: relative;
  padding: 36px 30px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: transform 0.32s ease, border-color 0.32s ease, box-shadow 0.32s ease;
}

.service-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.32s ease;
}

.service-card::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  top: -110px;
  right: -110px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.16), transparent 70%);
  opacity: 0;
  transition: opacity 0.32s ease;
  pointer-events: none;
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(139, 92, 246, 0.45);
  box-shadow: var(--shadow-card);
}

.service-card:hover::before,
.service-card:hover::after {
  opacity: 1;
}

.service-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  border: 1px solid var(--border-strong);
  background: linear-gradient(150deg, rgba(59, 130, 246, 0.14), rgba(139, 92, 246, 0.14));
  color: var(--cyan);
  margin-bottom: 24px;
}

.service-icon svg {
  width: 28px;
  height: 28px;
}

.service-title {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.service-en {
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.service-desc {
  margin-top: 16px;
  color: var(--text-dim);
  font-size: 14.5px;
  min-height: 72px;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.service-tags li {
  padding: 5px 13px;
  font-size: 12.5px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.02);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.service-card:hover .service-tags li {
  color: var(--text);
  border-color: rgba(34, 211, 238, 0.35);
}

.domains-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
  padding: 22px 28px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.015);
}

.domains-label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--text-dim);
}

.domains-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.domains-list li {
  padding: 6px 16px;
  font-size: 13.5px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.02);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.domains-list li:hover {
  color: var(--text);
  border-color: rgba(139, 92, 246, 0.45);
}

.domains-list .domains-more {
  color: var(--cyan);
  border-color: rgba(34, 211, 238, 0.3);
  background: rgba(34, 211, 238, 0.05);
}

/* ---------- 核心优势 ---------- */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 40px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(59, 130, 246, 0.06), rgba(139, 92, 246, 0.06));
  margin-bottom: 56px;
}

.stat {
  text-align: center;
  padding: 6px 10px;
}

.stat + .stat {
  border-left: 1px solid var(--border);
}

.stat-number {
  font-size: clamp(34px, 4.4vw, 48px);
  font-weight: 800;
  line-height: 1.15;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat-suffix {
  font-size: 0.55em;
  font-weight: 700;
}

.stat-label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  padding: 32px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transition: transform 0.32s ease, border-color 0.32s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 211, 238, 0.4);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: rgba(34, 211, 238, 0.08);
  color: var(--blue);
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
}

.feature-desc {
  margin-top: 12px;
  color: var(--text-dim);
  font-size: 14.5px;
}

/* ---------- 案例精选 ---------- */
.cases {
  background:
    radial-gradient(ellipse 55% 40% at 10% 10%, rgba(59, 130, 246, 0.06), transparent),
    var(--bg-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.cases-swiper-wrap {
  position: relative;
}

.cases-swiper {
  padding: 12px 6px 56px;
}

.case-card {
  height: 100%;
  padding: 30px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.case-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.45);
  box-shadow: var(--shadow-card);
}

.case-type {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 999px;
  margin-bottom: 18px;
}

.type-ai {
  color: #a78bfa;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.type-office {
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.type-edu {
  color: #22d3ee;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
}

.case-title {
  font-size: 19px;
  font-weight: 700;
}

.case-desc {
  margin-top: 12px;
  color: var(--text-dim);
  font-size: 14.5px;
  min-height: 66px;
}

.case-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.case-metrics span {
  padding: 5px 12px;
  font-size: 12.5px;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.28);
  background: rgba(34, 211, 238, 0.06);
  border-radius: 999px;
}

.cases-nav {
  position: absolute;
  top: 50%;
  left: -14px;
  right: -14px;
  transform: translateY(-72%);
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  z-index: 10;
}

.cases-btn {
  pointer-events: auto;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: rgba(9, 13, 26, 0.85);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text);
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.25s ease;
}

.cases-btn svg {
  width: 20px;
  height: 20px;
}

.cases-btn:hover {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.12);
  transform: scale(1.06);
}

.cases-pagination {
  position: relative;
  bottom: auto;
}

/* Swiper 分页器深色主题化 */
.swiper-pagination-bullet {
  background: rgba(255, 255, 255, 0.28);
  opacity: 1;
  transition: all 0.25s ease;
}

.swiper-pagination-bullet-active {
  width: 26px;
  border-radius: 4px;
  background: var(--grad);
}

/* ---------- 合作流程 ---------- */
.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px;
  counter-reset: step;
}

.process-step {
  position: relative;
  padding: 30px 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.process-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -26px;
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.5), rgba(34, 211, 238, 0.2));
}

.process-step:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 130, 246, 0.4);
}

.step-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.step-num {
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.03));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.step-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: linear-gradient(150deg, rgba(59, 130, 246, 0.12), rgba(34, 211, 238, 0.12));
  color: var(--cyan);
}

.step-icon svg {
  width: 22px;
  height: 22px;
}

.step-title {
  font-size: 18px;
  font-weight: 700;
}

.step-desc {
  margin-top: 10px;
  color: var(--text-dim);
  font-size: 14px;
}

/* ---------- 关于我们 ---------- */
.about-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(36px, 5vw, 72px);
  align-items: start;
}

.about .section-title {
  text-align: left;
}

.about-content .section-tag {
  text-align: left;
  display: block;
}

.about-text {
  margin-top: 22px;
  color: var(--text-dim);
  font-size: 15.5px;
}

.about-slogan {
  margin-top: 30px;
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.02em;
}

.path-list {
  margin-top: 26px;
}

.path-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.path-item + .path-item {
  margin-top: 14px;
}

.path-item:hover {
  transform: translateX(6px);
  border-color: rgba(34, 211, 238, 0.4);
}

.path-num {
  flex: none;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.15;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.path-body {
  min-width: 0;
}

.path-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.path-name {
  font-size: 16.5px;
  font-weight: 700;
}

.path-key {
  padding: 3px 13px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.3);
  background: rgba(34, 211, 238, 0.07);
  border-radius: 999px;
}

.path-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-dim);
}

.about-card {
  padding: 34px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    radial-gradient(ellipse 80% 50% at 100% 0%, rgba(34, 211, 238, 0.06), transparent),
    var(--bg-panel);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.about-card-title {
  font-size: 17px;
  font-weight: 700;
  padding-bottom: 18px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.about-item {
  padding: 16px 0;
}

.about-item + .about-item {
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
}

.about-item dt {
  font-size: 12.5px;
  color: var(--text-faint);
  letter-spacing: 0.14em;
  margin-bottom: 6px;
}

.about-item dd {
  font-size: 15px;
  line-height: 1.6;
}

/* ---------- 联系我们 ---------- */
.contact {
  background:
    radial-gradient(ellipse 55% 45% at 90% 100%, rgba(139, 92, 246, 0.08), transparent),
    var(--bg-soft);
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 4vw, 56px);
  align-items: center;
}

.info-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.info-card + .info-card {
  margin-top: 16px;
}

.info-card:hover {
  border-color: rgba(34, 211, 238, 0.4);
  transform: translateX(4px);
}

.info-icon {
  flex: none;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: linear-gradient(150deg, rgba(59, 130, 246, 0.12), rgba(34, 211, 238, 0.12));
  color: var(--cyan);
}

.info-icon svg {
  width: 22px;
  height: 22px;
}

.info-title {
  font-size: 15px;
  font-weight: 700;
}

.info-text {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.65;
}

.info-link {
  display: inline-block;
  margin-top: 6px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  padding: 7px 0;
  transition: color 0.25s ease;
  -webkit-tap-highlight-color: rgba(34, 211, 238, 0.25);
  tap-highlight-color: rgba(34, 211, 238, 0.25);
}

.info-link:hover {
  color: var(--text);
}

.info-link:active {
  color: var(--text);
}

.info-hint {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-faint);
}

.contact-tip {
  margin-top: 24px;
  padding: 16px 20px;
  border-left: 3px solid;
  border-image: linear-gradient(180deg, var(--blue), var(--purple)) 1;
  font-size: 14px;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.02);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 38px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  text-align: center;
}

.qr-frame {
  padding: 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 0 40px rgba(34, 211, 238, 0.12);
  margin-bottom: 14px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.qr-card:hover .qr-frame {
  transform: scale(1.03);
  box-shadow: 0 0 56px rgba(34, 211, 238, 0.25);
}

.qr-frame img {
  width: min(220px, 60vw);
  height: auto;
  border-radius: 6px;
}

.qr-title {
  font-size: 19px;
  font-weight: 700;
}

.qr-desc {
  font-size: 13.5px;
  color: var(--text-dim);
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: #04060c;
  padding: 56px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 44px;
}

.footer-slogan {
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--text-faint);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-dim);
  transition: color 0.25s ease;
  width: fit-content;
}

.footer-links a:hover {
  color: var(--cyan);
}

.footer-addr h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 10px;
}

.footer-addr p {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.8;
}

.footer-phone {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.04em;
  padding: 2px 0;
  transition: color 0.25s ease;
  -webkit-tap-highlight-color: rgba(34, 211, 238, 0.25);
  tap-highlight-color: rgba(34, 211, 238, 0.25);
}

.footer-phone:hover,
.footer-phone:active {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 13px;
  color: var(--text-faint);
}

.footer-bottom a {
  transition: color 0.25s ease;
}

.footer-bottom a:hover {
  color: var(--text-dim);
}

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: rgba(9, 13, 26, 0.9);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease,
    border-color 0.3s ease;
}

.back-top svg {
  width: 20px;
  height: 20px;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .cases-nav {
    left: -4px;
    right: -4px;
  }
}

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-content {
    text-align: center;
  }

  .hero-subtitle {
    margin-inline: auto;
  }

  .hero-actions,
  .hero-meta {
    justify-content: center;
  }

  .hero-art {
    order: 2;
    max-width: 440px;
    margin: 0 auto;
  }

  .services-grid,
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-card:nth-child(3) {
    grid-column: span 2;
  }

  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-step:nth-child(2)::after {
    display: none;
  }

  .about-inner,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 66px;
  }

  .br-md {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px 5% 24px;
    background: rgba(5, 7, 15, 0.96);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-link {
    padding: 13px 10px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover,
  .nav-link.active {
    background: rgba(255, 255, 255, 0.04);
  }

  .nav-cta {
    margin: 12px 0 0;
    justify-content: center;
  }

  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px 0;
    padding: 32px 16px;
  }

  .stat:nth-child(3) {
    border-left: none;
  }

  .process-list {
    grid-template-columns: 1fr;
  }

  .process-step::after {
    display: none !important;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .cases-nav {
    display: none;
  }
}

@media (max-width: 560px) {
  .services-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .service-card:nth-child(3) {
    grid-column: auto;
  }

  .service-desc {
    min-height: 0;
  }

  .hero-actions .btn {
    flex: 1;
  }

  .brand-en {
    display: none;
  }

  .footer-bottom {
    justify-content: center;
    text-align: center;
  }

  .back-top {
    right: 18px;
    bottom: 18px;
  }
}

/* ---------- 动效降级 ---------- */
@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;
  }
}