/* ============================================================
   动量数字 MOMENTUM — 官网样式
   严格对应 1440 设计稿：颜色 / 圆角 / 间距 / 字号 逐项还原
   ============================================================ */

:root {
  /* 底色层次（整体提亮一档，保持深色科技感） */
  --bg: #0d141b;
  --bg-2: #121a23;
  --bg-3: #0a0f15;
  --surface: #182430;
  --surface-2: #141e28;
  --surface-3: #16212c;

  /* 边框 */
  --line: #283747;
  --line-2: #263543;
  --line-3: #22303d;
  --line-4: #212e3a;
  --line-accent: #258a72;

  /* 品牌色 */
  --accent: #1fe0a8;
  --accent-2: #96f0d0;
  --accent-3: #a9cdc2;
  --accent-dim: #14453a;
  --accent-ink: #04120d;

  /* 文字 */
  --text: #f6faf8;
  --text-1: #eef4f2;
  --text-2: #d5e3dc;
  --text-3: #adbfcc;
  --text-4: #a1b5c3;
  --text-5: #93a7b5;
  --text-6: #8294a3;
  --text-7: #6f8291;
  --text-8: #60727f;
  --text-9: #b7c6d0;

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 28px;

  --font-cn: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: "Inter Tight", "Inter", "SF Pro Display", "Segoe UI", system-ui, sans-serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --pad-x: 120px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, p, figure, ul, ol {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

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

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

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

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

.wrap {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 12px;
  font-weight: 600;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease),
    border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  white-space: nowrap;
}

.btn-primary {
  padding: 17px 32px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 16px;
}

.btn-primary:hover {
  background: #2ff0b7;
  transform: translateY(-1px);
  box-shadow: 0 10px 28px -10px rgba(31, 224, 168, 0.55);
}

.btn-ghost {
  padding: 16px 30px;
  background: var(--surface-3);
  border: 1px solid #2c4053;
  color: var(--text-2);
  font-size: 16px;
  font-weight: 500;
}

.btn-ghost:hover {
  border-color: #40607e;
  color: var(--text);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 15px;
}

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(13, 20, 27, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.site-header.is-stuck {
  border-bottom-color: var(--line-3);
  background: rgba(13, 20, 27, 0.95);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
}

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

.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
}

.brand-name {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-1);
}

.brand-en {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1.6px;
  color: var(--text-8);
}

.nav {
  display: flex;
  align-items: center;
  gap: 38px;
}

.nav a {
  font-size: 15px;
  color: var(--text-3);
  transition: color 0.2s var(--ease);
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -6px;
  height: 1px;
  background: var(--accent);
  transition: right 0.28s var(--ease);
}

.nav a:hover {
  color: var(--text);
}

.nav a:hover::after {
  right: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 22px;
}

.hotline {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-2);
  transition: color 0.2s var(--ease);
}

.hotline:hover {
  color: var(--accent);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 10px;
  align-items: center;
  justify-content: center;
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--text-2);
  position: relative;
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--text-2);
}

.menu-toggle span::before { top: -5px; }
.menu-toggle span::after { top: 5px; }

/* 移动端菜单面板 */
.mobile-menu {
  display: none;
  border-top: 1px solid var(--line-3);
  background: var(--bg);
  padding: 8px 0 20px;
}

.mobile-menu a {
  display: block;
  padding: 14px 0;
  font-size: 15px;
  color: var(--text-3);
  border-bottom: 1px solid rgba(40, 55, 71, 0.6);
}

.mobile-menu .btn {
  width: 100%;
  margin-top: 18px;
}

/* ---------------- 首屏 ---------------- */
.hero {
  display: flex;
  align-items: center;
  gap: 64px;
  padding-top: 72px;
  padding-bottom: 88px;
}

.hero-copy {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 30px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 16px 8px 12px;
  border-radius: 100px;
  background: #142a25;
  border: 1px solid #265046;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-2);
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(31, 224, 168, 0.6);
  animation: pulse 2.6s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(31, 224, 168, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(31, 224, 168, 0); }
  100% { box-shadow: 0 0 0 0 rgba(31, 224, 168, 0); }
}

.hero h1 {
  font-size: 60px;
  line-height: 78px;
  font-weight: 900;
  letter-spacing: 0.5px;
  color: var(--text);
}

.hero-sub {
  max-width: 560px;
  font-size: 17px;
  line-height: 32px;
  color: var(--text-4);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-trust {
  font-size: 13px;
  line-height: 24px;
  color: var(--text-7);
}

/* 数据看板卡 */
.board {
  flex: 0 0 460px;
  width: 460px;
  padding: 24px 24px 22px;
  border-radius: 20px;
  background: var(--surface-2);
  border: 1px solid #263645;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
}

.board-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.board-label {
  font-size: 13px;
  color: var(--text-5);
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--accent-dim);
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.board-big {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.board-big strong {
  font-family: var(--font-num);
  font-size: 46px;
  line-height: 50px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.board-big span {
  font-size: 13px;
  color: var(--text-6);
}

.board-delta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-top: -6px;
}

.board-bars {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 9px;
  height: 124px;
}

.bar {
  width: 24px;
  height: var(--h);
  border-radius: 3px;
  background: #1d574a;
  transform-origin: bottom;
  transition: transform 0.85s var(--ease);
}

.bar:nth-child(5),
.bar:nth-child(6),
.bar:nth-child(7) { background: #21705c; }

.bar:nth-child(8),
.bar:nth-child(9),
.bar:nth-child(10),
.bar:nth-child(11) { background: #238268; }

.bar:nth-child(12) { background: var(--accent); }

.js .board-bars .bar { transform: scaleY(0); }
.js .board-bars.is-in .bar { transform: scaleY(1); }
.board-bars.is-in .bar:nth-child(1) { transition-delay: 0.02s; }
.board-bars.is-in .bar:nth-child(2) { transition-delay: 0.05s; }
.board-bars.is-in .bar:nth-child(3) { transition-delay: 0.08s; }
.board-bars.is-in .bar:nth-child(4) { transition-delay: 0.11s; }
.board-bars.is-in .bar:nth-child(5) { transition-delay: 0.14s; }
.board-bars.is-in .bar:nth-child(6) { transition-delay: 0.17s; }
.board-bars.is-in .bar:nth-child(7) { transition-delay: 0.2s; }
.board-bars.is-in .bar:nth-child(8) { transition-delay: 0.23s; }
.board-bars.is-in .bar:nth-child(9) { transition-delay: 0.26s; }
.board-bars.is-in .bar:nth-child(10) { transition-delay: 0.29s; }
.board-bars.is-in .bar:nth-child(11) { transition-delay: 0.32s; }
.board-bars.is-in .bar:nth-child(12) { transition-delay: 0.35s; }

.board-divider {
  height: 1px;
  background: var(--line-2);
}

.board-stat {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-4);
}

.board-stat b {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 600;
  color: #e6f0eb;
}

.board-stat b.up {
  color: var(--accent);
}

/* ---------------- 平台授权条 ---------------- */
.strip {
  padding-bottom: 64px;
}

.strip-line {
  height: 1px;
  background: var(--line-3);
}

.strip-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  gap: 24px;
  flex-wrap: wrap;
}

.strip-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-8);
  letter-spacing: 0.5px;
}

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

.logos span {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-6);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
  white-space: nowrap;
}

.logos span:hover {
  color: var(--text-2);
  transform: translateY(-1px);
}

/* ---------------- 通用区块头 ---------------- */
.section {
  padding: 104px 0;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-title {
  font-size: 40px;
  line-height: 56px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.2px;
}

.section-desc {
  max-width: 660px;
  font-size: 15px;
  line-height: 28px;
  color: var(--text-4);
}

/* ---------------- 服务矩阵 ---------------- */
.services {
  background: var(--bg-2);
  padding: 104px 0 100px;
}

.services-inner {
  display: flex;
  flex-direction: column;
  gap: 52px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  min-height: 234px;
  padding: 28px 28px 26px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease),
    background-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

/* 悬浮时左上角扫过一层微光 */
.service-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(31, 224, 168, 0.09) 0%, transparent 38%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}

.service-card:hover {
  transform: translateY(-3px);
  border-color: #38536b;
  box-shadow: 0 22px 44px -26px rgba(0, 0, 0, 0.85);
}

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

.service-card .icon-box {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  transition: transform 0.3s var(--ease), background-color 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

.service-card:hover .icon-box {
  transform: translateY(-2px) scale(1.07);
  background: #155142;
  box-shadow: 0 10px 22px -10px rgba(31, 224, 168, 0.45);
}

.service-card h3 {
  font-size: 20px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--text);
  transition: color 0.25s var(--ease);
}

.service-card:hover h3 {
  color: var(--accent-2);
}

.service-card p {
  font-size: 14px;
  line-height: 26px;
  color: var(--text-4);
}

.service-card.is-featured {
  border-color: var(--line-accent);
  background: linear-gradient(to bottom right, #0f3a2d 0%, #1d2933 100%);
}

.service-card.is-featured .icon-box {
  background: #185847;
}

.service-card.is-featured h3 {
  color: var(--accent-2);
}

.service-card.is-featured p {
  color: #b3d2c6;
}

/* ---------------- 服务流程 ---------------- */
.flow {
  background: var(--bg-2);
  padding-bottom: 104px;
}

.flow-divider {
  height: 1px;
  background: var(--line);
}

.flow-inner {
  padding-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.flow-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.flow-head-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.flow-title {
  font-size: 32px;
  line-height: 44px;
  font-weight: 700;
  color: var(--text);
}

.flow-note {
  max-width: 320px;
  text-align: right;
  font-size: 13px;
  line-height: 24px;
  color: var(--text-6);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-rule {
  position: relative;
  height: 2px;
  background: #2e4152;
  overflow: hidden;
  border-radius: 2px;
}

.step-fill {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 0;
  border-radius: 2px;
  background: linear-gradient(90deg, #17b98a, var(--accent));
  transition: width 0.9s var(--ease);
}

.step:nth-child(1) .step-fill { transition-delay: 0.05s; }
.step:nth-child(2) .step-fill { transition-delay: 0.2s; }
.step:nth-child(3) .step-fill { transition-delay: 0.35s; }
.step:nth-child(4) .step-fill { transition-delay: 0.5s; }

/* 入场：第 1 阶段跑满，其余 2–4 阶段亮出「进行中」的进度 */
.steps.is-in .step:nth-child(1) .step-fill { width: 100%; }
.steps.is-in .step:nth-child(2) .step-fill,
.steps.is-in .step:nth-child(3) .step-fill,
.steps.is-in .step:nth-child(4) .step-fill { width: 38%; }

/* 悬浮：该阶段的进度条补满并提亮 */
.step:hover .step-fill,
.steps.is-in .step:hover .step-fill {
  width: 100%;
  background: linear-gradient(90deg, var(--accent), #5cf3c8);
  transition: width 0.45s var(--ease), background 0.3s var(--ease);
  transition-delay: 0s;
}

.step .step-index,
.step h3 {
  transition: color 0.25s var(--ease);
}

.step:hover .step-index {
  color: var(--accent);
}

.step:hover h3 {
  color: var(--accent-2);
}

.step-index {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text-7);
}

.step h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}

.step p {
  font-size: 13px;
  line-height: 24px;
  color: var(--text-5);
}

.step:first-child .step-index { color: var(--accent); }

/* ---------------- 数据背书 ---------------- */
.metrics-wrap {
  background: var(--bg-2);
  padding-bottom: 88px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  padding: 42px 48px;
  border-radius: var(--radius-xl);
  border: 1px solid #27574a;
  background: linear-gradient(105deg, #133c31 0%, #16222e 100%);
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.metric strong {
  font-family: var(--font-num);
  font-size: 40px;
  line-height: 44px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  white-space: nowrap;
  transition: text-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.metric:hover strong {
  text-shadow: 0 0 26px rgba(31, 224, 168, 0.3);
  transform: translateY(-2px);
}

.metric span {
  font-size: 13px;
  color: var(--text-4);
}

.metric.is-accent strong {
  color: var(--accent);
}

/* ---------------- 客户案例 ---------------- */
.cases {
  padding-top: 96px;
  padding-bottom: 104px;
}

.cases-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 44px;
}

.cases-head-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cases-note {
  max-width: 300px;
  text-align: right;
  font-size: 13px;
  line-height: 22px;
  color: var(--text-7);
}

.cases-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 18px;
}

.cases-nav {
  display: flex;
  gap: 10px;
}

.cases-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid #2c4053;
  background: var(--surface-3);
  color: var(--text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease),
    background-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.cases-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background: #1a2a37;
  transform: translateY(-1px);
}

.cases-btn:active:not(:disabled) {
  transform: translateY(0);
}

.cases-btn:disabled {
  opacity: 0.32;
  cursor: default;
}

.case-grid {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  /* 吸附基准与左右出血内边距对齐，避免加载时自动滚过 120px */
  scroll-padding-left: var(--pad-x);
  /* 左右出血到页面边缘，滚动内容与 120px 版心对齐 */
  margin: 0 calc(-1 * var(--pad-x));
  padding: 4px var(--pad-x) 14px;
  scrollbar-width: none;
  -ms-overflow-style: none;
  cursor: grab;
}

.case-grid::-webkit-scrollbar {
  display: none;
}

.case-grid.is-dragging {
  cursor: grabbing;
  scroll-snap-type: none;
  user-select: none;
}

.case-grid.is-dragging .case-card {
  pointer-events: none;
}

.case-card {
  flex: 0 0 calc((100% - 40px) / 2.55);
  min-width: 320px;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.case-thumb {
  position: relative;
  height: 196px;
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.45s var(--ease), box-shadow 0.45s var(--ease);
}

.case-thumb.v1 { background: linear-gradient(to bottom right, #124f40 0%, #0f2534 100%); }
.case-thumb.v2 { background: linear-gradient(to bottom right, #243258 0%, #0f2f36 100%); }
.case-thumb.v3 { background: linear-gradient(to bottom right, #372620 0%, #163038 100%); }

.case-metric {
  position: absolute;
  left: 26px;
  bottom: 18px;
  font-family: var(--font-num);
  font-size: 68px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent);
  transition: transform 0.4s var(--ease), text-shadow 0.4s var(--ease);
}

.case-card h3,
.case-card .case-tag {
  transition: color 0.25s var(--ease);
}

.case-card:hover .case-thumb {
  transform: translateY(-4px) scale(1.012);
  box-shadow: 0 26px 44px -26px rgba(0, 0, 0, 0.85);
}

.case-card:hover .case-metric {
  transform: translateY(-6px);
  text-shadow: 0 14px 32px rgba(31, 224, 168, 0.4);
}

.case-card:hover h3 {
  color: var(--accent-2);
}

.case-card:hover .case-tag {
  color: var(--text-5);
}

.case-thumb.v2 .case-metric { color: var(--accent-2); }
.case-thumb.v3 .case-metric { color: var(--text); }

.case-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-7);
}

.case-card h3 {
  font-size: 18px;
  line-height: 28px;
  font-weight: 600;
  color: var(--text);
}

.case-card p {
  font-size: 13px;
  line-height: 24px;
  color: var(--text-5);
}

/* ---------------- 资质与团队 ---------------- */
.why {
  background: var(--bg-2);
  padding: 104px 0 96px;
}

.why-inner {
  display: flex;
  align-items: center;
  gap: 72px;
}

.why-copy {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.why-title {
  font-size: 38px;
  line-height: 54px;
  font-weight: 700;
  color: var(--text);
}

.why-desc {
  max-width: 560px;
  font-size: 15px;
  line-height: 28px;
  color: var(--text-4);
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.adv {
  min-height: 148px;
  padding: 20px 20px 18px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.adv:hover {
  border-color: #38536b;
  transform: translateY(-2px);
}

.adv-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  transition: transform 0.3s var(--ease), background-color 0.3s var(--ease);
}

.adv:hover .adv-icon {
  transform: scale(1.1);
  background: #155142;
}

.adv h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.adv p {
  font-size: 13px;
  line-height: 22px;
  color: var(--text-5);
}

.why-media {
  flex: 0 0 440px;
  width: 440px;
  height: 420px;
  border-radius: 20px;
  overflow: hidden;
  position: relative;
}

.why-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.why-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(13, 20, 27, 0.55), transparent 55%);
  pointer-events: none;
}

/* ---------------- 报价 ---------------- */
.pricing {
  padding-top: 104px;
  padding-bottom: 104px;
}

.pricing-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 44px;
}

.pricing-head-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-note {
  max-width: 300px;
  text-align: right;
  font-size: 13px;
  line-height: 22px;
  color: var(--text-7);
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: stretch;
}

.plan {
  min-height: 424px;
  padding: 32px 32px 30px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease),
    box-shadow 0.28s var(--ease);
}

.plan:hover {
  transform: translateY(-4px);
  border-color: #38536b;
  box-shadow: 0 26px 52px -30px rgba(0, 0, 0, 0.9);
}

.plan.is-featured:hover {
  border-color: #2aa585;
  box-shadow: 0 26px 52px -28px rgba(31, 224, 168, 0.3);
}

.plan-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-4);
}

.plan-price {
  font-family: var(--font-num);
  font-size: 38px;
  line-height: 44px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.plan-desc {
  font-size: 13px;
  line-height: 22px;
  color: var(--text-5);
}

.plan-divider {
  height: 1px;
  background: var(--line-2);
  margin-top: 2px;
}

.plan-features {
  font-size: 13px;
  line-height: 26px;
  color: var(--text-9);
  flex: 1 1 auto;
}

.plan-features li::before {
  content: "·";
  margin-right: 6px;
  color: var(--text-7);
}

.plan .btn {
  height: 46px;
  width: 100%;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
}

.plan .btn-ghost {
  padding: 0;
}

.plan .btn-primary {
  padding: 0;
  font-weight: 600;
}

.plan.is-featured {
  border-color: var(--line-accent);
  background: linear-gradient(to bottom right, #0f3a2d 0%, #16202a 100%);
}

.plan.is-featured .plan-name {
  color: var(--accent);
  font-weight: 600;
}

.plan.is-featured .plan-desc { color: #a7c4b9; }
.plan.is-featured .plan-features { color: #d9ecdf; }
.plan.is-featured .plan-divider { background: #27574a; }
.plan.is-featured .plan-features li::before { color: var(--accent); }

/* ---------------- FAQ ---------------- */
.faq {
  padding-bottom: 104px;
}

.faq-inner {
  display: flex;
  gap: 64px;
  align-items: flex-start;
}

.faq-left {
  flex: 0 0 360px;
  width: 360px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-title {
  font-size: 30px;
  line-height: 44px;
  font-weight: 700;
  color: var(--text);
}

.faq-left p {
  font-size: 13px;
  line-height: 24px;
  color: var(--text-7);
}

.faq-list {
  flex: 1 1 auto;
  min-width: 0;
}

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

.faq-item:last-child {
  border-bottom: 0;
}

.faq-item > summary {
  list-style: none;
  cursor: pointer;
}

.faq-item > summary::-webkit-details-marker {
  display: none;
}

address {
  font-style: normal;
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

.faq-q:hover {
  color: var(--accent-2);
}

.faq-toggle {
  flex: none;
  width: 20px;
  height: 20px;
  position: relative;
}

.faq-toggle::before,
.faq-toggle::after {
  content: "";
  position: absolute;
  top: 9px;
  left: 3px;
  width: 14px;
  height: 1.5px;
  background: var(--text-7);
  transition: transform 0.28s var(--ease), background-color 0.2s var(--ease);
}

.faq-toggle::after {
  transform: rotate(90deg);
}

.faq-item[open] .faq-toggle::after {
  transform: rotate(0deg);
}

.faq-item[open] .faq-toggle::before,
.faq-item[open] .faq-toggle::after {
  background: var(--accent);
}

.faq-a {
  padding: 0 0 22px;
  font-size: 13px;
  line-height: 24px;
  color: var(--text-5);
  max-width: 90%;
}

.faq-item[open] .faq-q {
  padding-bottom: 9px;
}

/* ---------------- 结尾 CTA ---------------- */
.cta-wrap {
  padding-bottom: 96px;
}

.cta-box {
  position: relative;
  overflow: hidden;
  padding: 62px 64px 58px;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--line-accent);
  background: linear-gradient(to bottom right, #164c3d 0%, #0d1a20 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.cta-box::before {
  content: "";
  position: absolute;
  width: 620px;
  height: 620px;
  right: -180px;
  top: -320px;
  background: radial-gradient(circle, rgba(31, 224, 168, 0.18), transparent 62%);
  pointer-events: none;
}

.cta-title {
  font-size: 40px;
  line-height: 54px;
  font-weight: 700;
  color: var(--text);
  position: relative;
}

.cta-sub {
  max-width: 760px;
  font-size: 15px;
  line-height: 28px;
  color: var(--accent-3);
  position: relative;
}

.cta-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 16px;
  flex-wrap: wrap;
  justify-content: center;
  position: relative;
}

.cta-alt {
  font-size: 14px;
  color: var(--text-4);
}

.cta-alt a {
  color: var(--text-2);
  border-bottom: 1px solid rgba(213, 227, 220, 0.45);
  padding-bottom: 1px;
}

.cta-alt a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: var(--bg-3);
  padding: 72px 0 36px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-brand {
  width: 330px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand-row .brand-name {
  font-size: 18px;
}

.footer-tagline {
  max-width: 300px;
  font-size: 13px;
  line-height: 24px;
  color: var(--text-6);
}

.footer-contact {
  font-size: 13px;
  line-height: 26px;
  color: var(--text-4);
  display: flex;
  flex-direction: column;
}

.footer-contact a:hover {
  color: var(--accent);
}

.footer-cols {
  display: flex;
  gap: 96px;
}

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

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0;
}

.footer-col a {
  font-size: 13px;
  color: var(--text-6);
  transition: color 0.2s var(--ease);
  white-space: nowrap;
}

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

.footer-line {
  height: 1px;
  background: var(--line-4);
  margin-top: 52px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 52px;
  font-size: 12px;
  color: var(--text-8);
  flex-wrap: wrap;
}

.footer-legal {
  display: flex;
  gap: 22px;
}

.footer-legal a:hover {
  color: var(--text-3);
}

/* ---------------- 留资弹窗 ---------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(3, 6, 9, 0.72);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s var(--ease), visibility 0.28s var(--ease);
}

.modal.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  width: 100%;
  max-width: 480px;
  padding: 36px;
  border-radius: 22px;
  background: #141e28;
  border: 1px solid #263645;
  box-shadow: 0 40px 100px -40px rgba(0, 0, 0, 0.9);
  transform: translateY(14px) scale(0.985);
  transition: transform 0.32s var(--ease);
  position: relative;
}

.modal.is-open .modal-card {
  transform: none;
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: var(--text-6);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.modal-close:hover {
  background: #1e2c3a;
  color: var(--text);
}

.modal-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.modal-card > p {
  font-size: 13px;
  line-height: 22px;
  color: var(--text-5);
  margin-bottom: 22px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.field label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-4);
  letter-spacing: 0.3px;
}

.field input,
.field select {
  height: 44px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid #2e4152;
  background: #18232e;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  width: 100%;
}

.field input::placeholder {
  color: #5d7280;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 224, 168, 0.12);
}

.field .error {
  font-size: 12px;
  color: #ff7a7a;
  min-height: 16px;
}

.modal-card .btn-primary {
  width: 100%;
  padding: 15px 24px;
  margin-top: 4px;
}

.modal-note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 20px;
  color: var(--text-8);
  text-align: center;
}

.modal-success {
  padding: 26px 0 10px;
  text-align: center;
}

.modal-success .ok-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: rgba(31, 224, 168, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-success h3 {
  margin-bottom: 10px;
}

.modal-success p {
  font-size: 13px;
  line-height: 22px;
  color: var(--text-5);
}

[hidden] {
  display: none !important;
}

/* ---------------- 进场动效 ---------------- */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .js .board-bars .bar { transform: none; transition: none; }
  .badge-dot { animation: none; }
  html { scroll-behavior: auto; }
  .step-fill { transition: none !important; }
  .service-card, .service-card .icon-box, .plan, .case-thumb, .case-metric,
  .cases-btn, .metric strong, .adv-icon, .logos span, .btn, .step .step-index, .step h3 {
    transition: none !important;
  }
  .service-card:hover, .plan:hover, .case-thumb, .case-metric, .metric strong,
  .icon-box, .adv-icon, .logos span { transform: none !important; }
}

/* ============================================================
   响应式：≥1280 严格按 1440 设计稿；以下逐级重排
   ============================================================ */
@media (max-width: 1360px) {
  :root { --pad-x: 72px; }
  .hero { gap: 48px; }
  .hero h1 { font-size: 54px; line-height: 70px; }
  .board { flex-basis: 420px; width: 420px; }
  .why-inner { gap: 48px; }
  .why-media { flex-basis: 380px; width: 380px; height: 380px; }
  .footer-cols { gap: 64px; }
}

@media (max-width: 1120px) {
  :root { --pad-x: 48px; }
  .nav { display: none; }
  .menu-toggle { display: flex; }
  .mobile-menu.is-open { display: block; }
  .hero { flex-direction: column; align-items: flex-start; padding-top: 48px; padding-bottom: 72px; }
  .hero-copy { width: 100%; }
  .hero h1 { font-size: 46px; line-height: 60px; }
  .hero-sub { max-width: 100%; }
  .board { width: 100%; flex: none; max-width: 560px; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 28px 30px; }
  .metrics { grid-template-columns: repeat(2, 1fr); gap: 32px 40px; padding: 36px 36px; }
  .why-inner { flex-direction: column; align-items: stretch; }
  .why-media { width: 100%; flex: none; height: 360px; }
  .plan-grid { grid-template-columns: 1fr; }
  .plan { min-height: 0; }
  .faq-inner { flex-direction: column; gap: 32px; }
  .faq-left { flex: none; width: 100%; max-width: 420px; }
  .footer-top { flex-direction: column; }
  .footer-cols { gap: 48px; flex-wrap: wrap; }
}

@media (max-width: 720px) {
  :root { --pad-x: 24px; }
  .header-inner { height: 72px; }
  .brand-name { font-size: 18px; }
  .brand-en { display: none; }
  .hotline { display: none; }
  html { scroll-padding-top: 72px; }
  .hero { padding-top: 36px; padding-bottom: 56px; gap: 40px; }
  .hero h1 { font-size: 34px; line-height: 46px; letter-spacing: 0; }
  .hero-sub { font-size: 15px; line-height: 28px; }
  .hero-cta { width: 100%; }
  .btn-primary { padding: 15px 26px; font-size: 15px; }
  .btn-ghost { padding: 14px 24px; font-size: 15px; }
  .hero-trust { font-size: 12px; line-height: 22px; }
  .board { padding: 20px 18px 18px; border-radius: 16px; }
  .board-big strong { font-size: 38px; line-height: 42px; }
  .board-bars { gap: 6px; height: 104px; }
  .bar { flex: 1 1 0; width: auto; min-width: 0; }
  .strip { padding-bottom: 48px; }
  .logos { gap: 20px; }
  .logos span { font-size: 13px; }
  .section, .services { padding: 64px 0; }
  .services-inner { gap: 32px; }
  .section-title { font-size: 26px; line-height: 38px; }
  .section-desc { font-size: 14px; line-height: 26px; }
  .service-grid { grid-template-columns: 1fr; gap: 14px; }
  .service-card { min-height: 0; padding: 22px; }
  .flow { padding-bottom: 64px; }
  .flow-inner { padding-top: 32px; gap: 28px; }
  .flow-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .flow-title { font-size: 24px; line-height: 34px; }
  .flow-note { text-align: left; max-width: 100%; }
  .steps { grid-template-columns: 1fr; gap: 24px; }
  .metrics-wrap { padding-bottom: 56px; }
  .metrics { grid-template-columns: 1fr 1fr; gap: 24px; padding: 26px 22px; border-radius: 18px; }
  .metric strong { font-size: 28px; line-height: 32px; }
  .metric span { font-size: 12px; line-height: 18px; }
  .cases { padding-top: 64px; padding-bottom: 64px; }
  .cases-head { flex-direction: column; align-items: flex-start; gap: 16px; margin-bottom: 28px; }
  .cases-note { text-align: left; max-width: 100%; }
  .case-grid { gap: 16px; margin: 0 calc(-1 * var(--pad-x)); padding: 4px var(--pad-x) 12px; }
  .case-card { flex-basis: 84%; min-width: 0; gap: 14px; }
  .case-thumb { height: 180px; }
  .cases-side { align-items: flex-start; gap: 14px; }
  .cases-btn { width: 40px; height: 40px; }
  .case-metric { font-size: 54px; }
  .why { padding: 64px 0; }
  .why-title { font-size: 26px; line-height: 38px; }
  .why-desc { font-size: 14px; line-height: 26px; }
  .adv-grid { grid-template-columns: 1fr; }
  .adv { min-height: 0; }
  .why-media { height: 240px; }
  .pricing { padding-top: 64px; padding-bottom: 64px; }
  .pricing-head { flex-direction: column; align-items: flex-start; gap: 16px; margin-bottom: 28px; }
  .pricing-note { text-align: left; max-width: 100%; }
  .plan { padding: 26px 22px; }
  .plan-price { font-size: 32px; line-height: 38px; }
  .faq { padding-bottom: 64px; }
  .faq-title { font-size: 24px; line-height: 34px; }
  .faq-q { font-size: 15px; padding: 18px 0; }
  .faq-a { max-width: 100%; padding-bottom: 18px; }
  .cta-wrap { padding-bottom: 64px; }
  .cta-box { padding: 40px 22px; border-radius: 20px; gap: 18px; }
  .cta-title { font-size: 26px; line-height: 36px; }
  .cta-sub { font-size: 13px; line-height: 24px; }
  .cta-row { gap: 12px; padding-top: 8px; }
  .site-footer { padding: 48px 0 28px; }
  .footer-brand { width: 100%; }
  .footer-cols { gap: 32px 40px; }
  .footer-line { margin-top: 36px; }
  .footer-bottom { margin-top: 28px; gap: 12px; }
  .modal-card { padding: 26px 22px; }
}