/* ============================================================
   图博 TUBO · 官网 v2（科技感 / 时尚版）
   设计语言：深空宇宙底 + 玻璃拟态 + 青紫渐变 + 沉浸大图
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景层级 */
  --bg-0: #050714;
  --bg-1: #080b1c;
  --bg-2: #0c1130;
  --bg-3: #14114a;

  /* 文字 */
  --ink-0: #ffffff;
  --ink-1: rgba(255, 255, 255, 0.88);
  --ink-2: rgba(255, 255, 255, 0.66);
  --ink-3: rgba(255, 255, 255, 0.42);

  /* 玻璃面板 */
  --glass: rgba(255, 255, 255, 0.04);
  --glass-hi: rgba(255, 255, 255, 0.07);
  --glass-bd: rgba(255, 255, 255, 0.09);
  --glass-bd-hi: rgba(255, 255, 255, 0.18);

  /* 品牌色 */
  --cyan: #4ad6ff;
  --cyan-strong: #00bfff;
  --violet: #a855f7;
  --violet-strong: #7c3aed;
  --amber: #ffb84d;
  --pink: #ff5e9c;
  --mint: #34e3c4;

  /* 渐变 */
  --grad-cyan: linear-gradient(135deg, #4ad6ff 0%, #00bfff 50%, #5b8def 100%);
  --grad-violet: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
  --grad-warm: linear-gradient(135deg, #ffb84d 0%, #ff5e9c 100%);
  --grad-mint: linear-gradient(135deg, #34e3c4 0%, #4ad6ff 100%);
  --grad-text: linear-gradient(110deg, #ffffff 0%, #c4eaff 35%, #a78bff 70%, #ffb1d6 100%);
  --grad-bg: radial-gradient(ellipse 80% 60% at 50% 0%, #1b1a5c 0%, #080b1c 55%, #050714 100%);

  /* 尺寸 */
  --container: 1280px;
  --header-h: 72px;
  --radius: 20px;
  --radius-sm: 12px;
  --radius-lg: 28px;

  /* 阴影 */
  --shadow-glow: 0 0 80px rgba(74, 214, 255, 0.18);
  --shadow-card: 0 24px 64px rgba(0, 0, 0, 0.45);

  /* 过渡 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

/* ---------- 无障碍 skip-link ---------- */
/* 默认隐藏（移到视口外），仅键盘 Tab 聚焦时显形，避免无样式链接污染页面顶端布局 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 10px 18px;
  background: var(--bg-1, #080b1c);
  color: var(--ink-0, #fff);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0 0 8px 0;
  outline: 2px solid var(--cyan, #4ad6ff);
}
.skip-link:focus,
.skip-link:focus-visible {
  left: 0;
}

body {
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
    "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  background: var(--bg-0);
  color: var(--ink-1);
  line-height: 1.7;
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* 整页深空底色 + 多层光晕 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  background:
    radial-gradient(ellipse 60% 50% at 80% 0%, rgba(168, 85, 247, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse 70% 60% at 0% 20%, rgba(0, 191, 255, 0.14) 0%, transparent 55%),
    radial-gradient(ellipse 80% 50% at 50% 80%, rgba(255, 94, 156, 0.08) 0%, transparent 60%),
    var(--grad-bg);
  pointer-events: none;
}

/* 星点 / 网格底纹 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255, 255, 255, 0.7) 50%, transparent 51%),
    radial-gradient(1px 1px at 28% 72%, rgba(255, 255, 255, 0.55) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 55% 35%, rgba(255, 255, 255, 0.85) 50%, transparent 51%),
    radial-gradient(1px 1px at 78% 60%, rgba(255, 255, 255, 0.6) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 92% 22%, rgba(255, 255, 255, 0.7) 50%, transparent 51%),
    radial-gradient(1px 1px at 8% 88%, rgba(255, 255, 255, 0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 42% 92%, rgba(255, 255, 255, 0.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 65% 14%, rgba(255, 255, 255, 0.5) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 88% 80%, rgba(255, 255, 255, 0.7) 50%, transparent 51%);
  background-size: 1200px 800px;
  background-repeat: repeat;
  opacity: 0.9;
  pointer-events: none;
  animation: starTwinkle 8s ease-in-out infinite alternate;
}

@keyframes starTwinkle {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

/* 全局元素基线 */
img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

ul,
ol {
  list-style: none;
}

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

::selection {
  background: rgba(74, 214, 255, 0.35);
  color: #fff;
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  position: relative;
  padding-block: 96px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3.5px;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 18px;
}

.section-eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.18;
  color: var(--ink-0);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

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

.section-desc {
  max-width: 640px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.7;
}

.section-head {
  margin-bottom: 56px;
}

.section-head.center {
  text-align: center;
  margin-inline: auto;
  max-width: 720px;
}

.section-head.center .section-desc {
  margin-inline: auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.4px;
  white-space: nowrap;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s var(--ease), box-shadow 0.3s var(--ease),
    background 0.25s var(--ease), border-color 0.25s var(--ease);
  border: 1px solid transparent;
}

.btn:active {
  transform: scale(0.97);
}

.btn .arrow {
  transition: transform 0.25s var(--ease);
}

.btn:hover .arrow {
  transform: translateX(4px);
}

.btn-primary {
  background: var(--grad-cyan);
  color: #001626;
  box-shadow:
    0 10px 30px rgba(74, 214, 255, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  font-weight: 700;
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #6ee5ff 0%, #00bfff 50%, #5b8def 100%);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.btn-primary > * {
  position: relative;
  z-index: 1;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 16px 40px rgba(74, 214, 255, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-ghost {
  background: var(--glass);
  border-color: var(--glass-bd-hi);
  color: var(--ink-0);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.btn-ghost:hover {
  background: var(--glass-hi);
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--glass-bd-hi);
  color: var(--ink-0);
  padding: 11px 22px;
  font-size: 14px;
}

.btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(5, 7, 20, 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom-color: var(--glass-bd);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--glass-hi);
  padding: 4px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--ink-0);
  letter-spacing: 1.5px;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand-sub {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2.5px;
  color: var(--ink-3);
  margin-top: 2px;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  display: block;
  padding: 8px 16px;
  font-size: 14.5px;
  color: var(--ink-2);
  border-radius: 8px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.nav-link:hover {
  color: var(--ink-0);
  background: var(--glass);
}

.nav-link.active {
  color: var(--cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-phone {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--ink-2);
  border: 1px solid var(--glass-bd);
  border-radius: 999px;
  background: var(--glass);
}

.nav-phone svg {
  color: var(--cyan);
}

.nav-cta {
  padding: 10px 22px;
  font-size: 14px;
}

/* 汉堡 */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  gap: 5px;
}

.nav-toggle .bar {
  width: 20px;
  height: 2px;
  background: var(--ink-0);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-links.open {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  padding: 14px 20px 22px;
  background: rgba(5, 7, 20, 0.94);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--glass-bd);
}

.nav-links.open .nav-link {
  padding: 14px 16px;
  font-size: 16px;
}

.nav-links.open .nav-actions-mobile {
  display: block;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--glass-bd);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--header-h) + 80px);
  padding-bottom: 80px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 20%;
  left: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(74, 214, 255, 0.15), transparent 60%);
  filter: blur(60px);
  pointer-events: none;
  animation: orbFloat 14s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -10%;
  right: -10%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18), transparent 60%);
  filter: blur(60px);
  pointer-events: none;
  animation: orbFloat 18s ease-in-out infinite reverse;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.1); }
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 7px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  font-size: 13px;
  color: var(--ink-1);
  margin-bottom: 32px;
}

.hero-badge-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--grad-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: #001626;
  font-weight: 800;
}

.hero-title {
  font-size: clamp(38px, 7vw, 76px);
  font-weight: 800;
  line-height: 1.06;
  color: var(--ink-0);
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}

.hero-title .grad {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  display: inline-block;
}

.hero-title .glow {
  position: relative;
  display: inline-block;
}

.hero-title .glow::after {
  content: "";
  position: absolute;
  inset: -8px -16px;
  background: radial-gradient(ellipse at center, rgba(74, 214, 255, 0.3), transparent 70%);
  z-index: -1;
  filter: blur(20px);
}

.hero-sub {
  font-size: 17px;
  color: var(--ink-2);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 48px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  padding-top: 32px;
  border-top: 1px solid var(--glass-bd);
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-meta-num {
  font-size: 30px;
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.hero-meta-num .unit {
  font-size: 14px;
  color: var(--ink-2);
  -webkit-text-fill-color: var(--ink-2);
  font-weight: 500;
  margin-left: 2px;
}

.hero-meta-label {
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.5px;
}

/* Hero 视觉：3D 电视框 */
.hero-visual {
  position: relative;
  height: 540px;
  display: none;
  perspective: 1600px;
}

.tv-wrap {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  animation: tvFloat 6s ease-in-out infinite;
}

@keyframes tvFloat {
  0%, 100% { transform: translateY(0) rotateX(8deg) rotateY(-12deg); }
  50% { transform: translateY(-14px) rotateX(8deg) rotateY(-12deg); }
}

.tv-frame {
  position: absolute;
  border-radius: 24px;
  background: linear-gradient(160deg, #1a1f3e 0%, #0c1130 100%);
  padding: 14px;
  box-shadow:
    0 50px 100px -20px rgba(0, 0, 0, 0.6),
    0 0 0 1px var(--glass-bd-hi),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transform-style: preserve-3d;
}

.tv-frame.main {
  inset: 0;
  z-index: 2;
  transform: translateZ(40px);
}

.tv-frame.back {
  inset: 6% 8% 6% 8%;
  z-index: 1;
  opacity: 0.5;
  background: linear-gradient(160deg, #14183a 0%, #0a0d28 100%);
  transform: translateZ(0px) translate(40px, 30px) rotate(2deg);
  filter: blur(1px);
}

.tv-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
  display: block;
}

.tv-glow {
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse at center, rgba(74, 214, 255, 0.4), transparent 60%);
  z-index: -1;
  filter: blur(40px);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

/* 浮动装饰小卡片 */
.float-card {
  position: absolute;
  z-index: 5;
  padding: 14px 18px;
  background: rgba(20, 24, 56, 0.65);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--glass-bd-hi);
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-card);
  font-size: 13px;
  color: var(--ink-1);
  animation: cardFloat 5s ease-in-out infinite;
}

.float-card-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.float-card-icon.cyan {
  background: rgba(74, 214, 255, 0.15);
  color: var(--cyan);
}

.float-card-icon.violet {
  background: rgba(168, 85, 247, 0.15);
  color: var(--violet);
}

.float-card-icon.amber {
  background: rgba(255, 184, 77, 0.15);
  color: var(--amber);
}

.float-card-title {
  display: block;
  font-weight: 700;
  color: var(--ink-0);
  font-size: 13px;
  line-height: 1.3;
}

.float-card-sub {
  display: block;
  font-size: 11px;
  color: var(--ink-3);
  margin-top: 2px;
}

.float-card.f1 {
  top: 8%;
  left: -8%;
  animation-delay: 0s;
}

.float-card.f2 {
  bottom: 14%;
  right: -4%;
  animation-delay: 1.5s;
}

@keyframes cardFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 跑马灯：服务场景 ---------- */
.marquee {
  position: relative;
  border-block: 1px solid var(--glass-bd);
  background: rgba(8, 11, 28, 0.4);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  padding-block: 18px;
  overflow: hidden;
}

.marquee::before,
.marquee::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 120px;
  z-index: 2;
  pointer-events: none;
}

.marquee::before {
  left: 0;
  background: linear-gradient(90deg, var(--bg-0), transparent);
}

.marquee::after {
  right: 0;
  background: linear-gradient(-90deg, var(--bg-0), transparent);
}

.marquee-track {
  display: flex;
  gap: 60px;
  width: max-content;
  animation: marquee 40s linear infinite;
}

.marquee-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink-2);
  white-space: nowrap;
  font-weight: 500;
  letter-spacing: 1px;
}

.marquee-item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- 解决方案 4 大场景 ---------- */
.solutions {
  position: relative;
}

.solutions::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-bd-hi), transparent);
  transform: translateX(-50%);
}

.solutions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.solution-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform 0.4s var(--ease), border-color 0.3s var(--ease), box-shadow 0.4s var(--ease);
  cursor: pointer;
  min-height: 360px;
  display: flex;
  flex-direction: column;
}

.solution-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-bd-hi);
  box-shadow: var(--shadow-card);
}

.solution-cover {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.solution-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.solution-card:hover .solution-cover img {
  transform: scale(1.06);
}

.solution-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(5, 7, 20, 0.9) 100%);
}

.solution-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--solution-tint, linear-gradient(135deg, rgba(74, 214, 255, 0.25), rgba(168, 85, 247, 0.2)));
  mix-blend-mode: overlay;
}

.solution-num {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 2;
  font-size: 64px;
  font-weight: 800;
  color: var(--ink-0);
  opacity: 0.18;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.solution-body {
  padding: 24px 26px 28px;
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.solution-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--glass-hi);
  border: 1px solid var(--glass-bd);
  font-size: 11px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 1px;
  margin-bottom: 14px;
  align-self: flex-start;
}

.solution-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-0);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.solution-card p {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.65;
  margin-bottom: 18px;
  flex: 1;
}

.solution-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.solution-features span {
  font-size: 12px;
  color: var(--ink-2);
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-bd);
}

.solution-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  align-self: flex-start;
  transition: gap 0.25s var(--ease);
}

.solution-card:hover .solution-link {
  gap: 12px;
}

/* 4 张卡分别注入不同色调 */
.solution-card.s1 { --solution-tint: linear-gradient(135deg, rgba(74, 214, 255, 0.3), rgba(91, 141, 239, 0.2)); }
.solution-card.s1 .solution-tag { color: var(--cyan); }
.solution-card.s2 { --solution-tint: linear-gradient(135deg, rgba(52, 227, 196, 0.3), rgba(74, 214, 255, 0.2)); }
.solution-card.s2 .solution-tag { color: var(--mint); }
.solution-card.s3 { --solution-tint: linear-gradient(135deg, rgba(255, 184, 77, 0.3), rgba(255, 94, 156, 0.2)); }
.solution-card.s3 .solution-tag { color: var(--amber); }
.solution-card.s4 { --solution-tint: linear-gradient(135deg, rgba(168, 85, 247, 0.3), rgba(255, 94, 156, 0.2)); }
.solution-card.s4 .solution-tag { color: var(--violet); }

/* ---------- 产品矩阵展示 ---------- */
.products {
  position: relative;
}

.products::before {
  content: "";
  position: absolute;
  top: 10%;
  left: -10%;
  width: 40%;
  height: 60%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.1), transparent 60%);
  filter: blur(80px);
  pointer-events: none;
}

.products-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 56px;
}

.products-head .section-title {
  margin-bottom: 0;
}

.products-stage {
  position: relative;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(ellipse 60% 80% at 50% 0%, rgba(74, 214, 255, 0.12), transparent 60%),
    linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--glass-bd);
  padding: 40px 20px;
  overflow: hidden;
}

.products-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 80%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 80%);
  pointer-events: none;
}

.products-mosaic {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: 18px;
  max-width: 1080px;
  margin-inline: auto;
}

.product-tile.main {
  grid-column: 1 / -1;
}

.product-tile {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 80% at 50% 50%, rgba(20, 17, 74, 0.6), rgba(5, 7, 20, 0.95)),
    var(--bg-1);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--shadow-card);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-tile:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.55),
    0 0 0 1px var(--glass-bd-hi);
}

.product-tile img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 6px;
}

.product-tile.main {
  grid-row: span 2;
  aspect-ratio: 16 / 9;
}

.product-tile {
  aspect-ratio: 16 / 9;
}

.product-tile-label {
  position: absolute;
  left: 16px;
  bottom: 16px;
  z-index: 2;
  padding: 6px 14px;
  background: rgba(5, 7, 20, 0.7);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-bd);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-0);
  letter-spacing: 0.5px;
}

.product-tile-label .dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  margin-right: 8px;
  vertical-align: middle;
}

/* ---------- 能力卡片 ---------- */
.capability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.capability-card {
  position: relative;
  padding: 32px 28px;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.capability-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-bd-hi);
  background: var(--glass-hi);
}

.capability-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-color, var(--cyan)), transparent);
  opacity: 0.6;
}

.capability-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-bg, rgba(74, 214, 255, 0.12));
  color: var(--accent-color, var(--cyan));
  margin-bottom: 22px;
  position: relative;
}

.capability-icon::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 18px;
  border: 1px solid var(--accent-color, var(--cyan));
  opacity: 0.25;
}

.capability-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-0);
  margin-bottom: 10px;
  letter-spacing: 0.3px;
}

.capability-card p {
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.7;
}

.capability-card .num {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 2px;
}

.capability-card.c1 { --accent-color: var(--cyan); --accent-bg: rgba(74, 214, 255, 0.12); }
.capability-card.c2 { --accent-color: var(--violet); --accent-bg: rgba(168, 85, 247, 0.12); }
.capability-card.c3 { --accent-color: var(--amber); --accent-bg: rgba(255, 184, 77, 0.12); }
.capability-card.c4 { --accent-color: var(--mint); --accent-bg: rgba(52, 227, 196, 0.12); }

/* ---------- 服务流程 ---------- */
.process {
  position: relative;
  background: linear-gradient(180deg, transparent, rgba(20, 17, 74, 0.25), transparent);
}

.process-list {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.process-list::before {
  content: "";
  position: absolute;
  top: 60px;
  left: 50%;
  width: 1px;
  height: calc(100% - 120px);
  background: linear-gradient(180deg, transparent, var(--glass-bd-hi), transparent);
  display: none;
}

.process-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 22px;
  padding: 28px 28px;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.process-item:hover {
  transform: translateX(6px);
  border-color: var(--glass-bd-hi);
}

.process-step {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, rgba(74, 214, 255, 0.15), rgba(168, 85, 247, 0.1));
  border: 1px solid var(--glass-bd-hi);
  font-size: 22px;
  font-weight: 800;
  color: var(--cyan);
  letter-spacing: -0.02em;
  position: relative;
}

.process-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-0);
  margin-bottom: 6px;
}

.process-item p {
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.65;
}

.process-item .duration {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* ---------- 联系区 ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: stretch;
}

.contact-info {
  position: relative;
  padding: 36px 32px;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  border-radius: var(--radius-lg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

.contact-info::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 100%;
  background: radial-gradient(circle, rgba(74, 214, 255, 0.12), transparent 60%);
  filter: blur(40px);
  pointer-events: none;
}

.contact-list {
  display: grid;
  gap: 18px;
  margin-top: 28px;
  position: relative;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--glass-bd);
  border-radius: 14px;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.contact-list li:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--glass-bd-hi);
}

.contact-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(74, 214, 255, 0.12);
  color: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-list strong {
  display: block;
  font-size: 12px;
  color: var(--ink-3);
  font-weight: 500;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.contact-list span {
  font-size: 16px;
  color: var(--ink-0);
  font-weight: 600;
}

.contact-form {
  position: relative;
  padding: 36px 32px;
  background: var(--glass);
  border: 1px solid var(--glass-bd);
  border-radius: var(--radius-lg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.form-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-0);
  margin-bottom: 8px;
}

.form-sub {
  color: var(--ink-2);
  font-size: 14px;
  margin-bottom: 28px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.form-field {
  margin-bottom: 18px;
}

.form-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-1);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.form-field .req {
  color: var(--pink);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid var(--glass-bd);
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink-0);
  font: inherit;
  font-size: 15px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--ink-3);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--cyan);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 0 0 4px rgba(74, 214, 255, 0.12);
}

.form-field textarea {
  resize: vertical;
  min-height: 110px;
}

.form-field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24'><path fill='%234ad6ff' d='M7 10l5 5 5-5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-field.invalid input,
.form-field.invalid select,
.form-field.invalid textarea {
  border-color: var(--pink);
}

.field-error {
  color: var(--pink);
  font-size: 12px;
  min-height: 16px;
  margin-top: 6px;
}

.form-status {
  text-align: center;
  font-size: 14px;
  margin-top: 14px;
  min-height: 22px;
}

.form-status.success { color: var(--mint); }
.form-status.error { color: var(--pink); }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  border-top: 1px solid var(--glass-bd);
  background: rgba(5, 7, 20, 0.6);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  padding-block: 48px 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.7;
  max-width: 360px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-0);
  margin-bottom: 18px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.footer-col ul {
  display: grid;
  gap: 10px;
}

.footer-col a {
  color: var(--ink-2);
  font-size: 14px;
  transition: color 0.2s var(--ease);
}

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

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 24px;
  border-top: 1px solid var(--glass-bd);
  font-size: 13px;
  color: var(--ink-3);
  text-align: center;
}

.footer-bottom p {
  margin: 0;
}

.beian {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.beian img {
  width: 14px;
  height: 14px;
  vertical-align: middle;
}

/* ---------- 滚动显现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-stagger.visible > * {
  opacity: 1;
  transform: none;
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.24s; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.32s; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
  }
}

/* ============================================================
   响应式断点
   ============================================================ */

@media (min-width: 640px) {
  .products-mosaic {
    grid-template-columns: 1.2fr 1fr 1fr;
    grid-template-rows: 1fr 1fr;
  }
  .product-tile.main {
    grid-column: 1 / 2;
    grid-row: span 2;
  }
  .capability-grid {
    grid-template-columns: 1fr 1fr;
  }
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
  .hero-meta {
    gap: 36px;
  }
}

@media (min-width: 1024px) {
  .section {
    padding-block: 120px;
  }
  .nav-toggle {
    display: none;
  }
  .nav-links {
    display: flex;
  }
  .nav-phone {
    display: inline-flex;
  }
  .hero-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
  }
  .hero-visual {
    display: block;
  }
  .solutions-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .solution-card {
    min-height: 480px;
  }
  .capability-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .process-list {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .process-list::before {
    display: block;
  }
  .process-item {
    flex-direction: column;
    padding: 32px 28px;
  }
  .process-item:hover {
    transform: translateY(-6px);
  }
  .contact-wrap {
    grid-template-columns: 1fr 1.2fr;
    gap: 32px;
  }
  .footer-grid {
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
  }
  .hero {
    padding-top: calc(var(--header-h) + 60px);
  }
}