/* ============================================
   有迹科技 · 暗黑高级质感 主样式
   ============================================ */

/* ---------- 设计变量 ---------- */
:root {
  /* 背景色阶 */
  --bg-deepest: #0A0A0B;
  --bg-base: #101012;
  --bg-elevated: #16161A;
  --bg-card: #1C1C1F;
  --bg-card-hover: #222227;
  --bg-fog: #2A2A2E;

  /* 金色系点缀 */
  --gold: #C9A961;
  --gold-bright: #D8BE7E;
  --gold-deep: #B8763E;
  --gold-dim: rgba(201, 169, 97, 0.15);
  --gold-glow: rgba(201, 169, 97, 0.35);

  /* 文字色阶 */
  --text-primary: #F5F5F0;
  --text-secondary: #9A9A95;
  --text-tertiary: #5C5C58;
  --text-faint: #3A3A37;

  /* 描边与分割 */
  --border-faint: rgba(201, 169, 97, 0.08);
  --border-subtle: rgba(201, 169, 97, 0.18);
  --border-strong: rgba(201, 169, 97, 0.4);

  /* 字体 */
  --font-display: "Cormorant Garamond", "Noto Serif SC", serif;
  --font-body: "Manrope", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --font-serif-cn: "Noto Serif SC", serif;

  /* 间距 */
  --space-section: 140px;
  --space-pad: 8px;

  /* 容器宽度 */
  --container-max: 1280px;

  /* 过渡 */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-lux: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-base: 0.6s var(--ease-out);
  --transition-slow: 1.2s var(--ease-lux);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-deepest);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  cursor: none;
}

/* 移动端样式调整 */
@media (max-width: 1023px) {
  body { cursor: none; }
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

::selection {
  background: var(--gold);
  color: var(--bg-deepest);
}

/* ---------- 自定义滚动条 ---------- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-deepest);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--gold-deep), var(--gold));
  border-radius: 3px;
}

/* ---------- 噪点蒙层 ---------- */
.grain-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* ---------- 自定义光标 ---------- */
.cursor-dot {
  position: fixed;
  width: 6px;
  height: 6px;
  background: var(--gold);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.15s var(--ease-out);
}

.cursor-ring {
  position: fixed;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease-out), height 0.3s var(--ease-out), border-color 0.3s;
}

.cursor-ring.hovering {
  width: 56px;
  height: 56px;
  border-color: var(--gold);
}

/* ---------- 加载动画 ---------- */
.loader {
  position: fixed;
  inset: 0;
  background: var(--bg-deepest);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  transition: opacity 0.8s var(--ease-out), visibility 0.8s;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-inner {
  display: flex;
  gap: 4px;
  font-family: var(--font-serif-cn);
  font-size: 42px;
  font-weight: 500;
  color: var(--gold);
  letter-spacing: 0.1em;
}

.loader-char {
  opacity: 0;
  transform: translateY(20px);
  animation: charReveal 0.6s var(--ease-out) forwards;
  animation-delay: calc(var(--i) * 0.12s + 0.2s);
}

@keyframes charReveal {
  to { opacity: 1; transform: translateY(0); }
}

.loader-line {
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  animation: lineExpand 1.4s var(--ease-out) 0.4s forwards;
}

@keyframes lineExpand {
  to { width: 220px; }
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 24px 0;
  transition: padding var(--transition-base), background var(--transition-base), backdrop-filter var(--transition-base);
}

.navbar.scrolled {
  padding: 16px 0;
  background: rgba(10, 10, 11, 0.7);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--border-faint);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-family: var(--font-serif-cn);
  font-size: 18px;
  font-weight: 600;
  color: var(--gold);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  background: linear-gradient(135deg, rgba(201,169,97,0.08), transparent);
}

.logo-text {
  font-family: var(--font-serif-cn);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-link {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: width var(--transition-base);
}

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

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

.nav-cta {
  padding: 8px 20px;
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  color: var(--text-primary);
}

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

.nav-cta:hover {
  background: var(--gold);
  color: var(--bg-deepest);
  border-color: var(--gold);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 1px;
  background: var(--text-primary);
  transition: var(--transition-base);
}

/* ---------- 移动端抽屉 ---------- */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s, visibility 0.4s;
}

.drawer-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100vh;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border-faint);
  z-index: 1101;
  transform: translateX(100%);
  transition: transform 0.5s var(--ease-lux);
  display: flex;
  flex-direction: column;
}

.drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px;
  border-bottom: 1px solid var(--border-faint);
}

.drawer-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  transition: color var(--transition-base);
}

.drawer-close:hover { color: var(--gold); }

.drawer-menu {
  list-style: none;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.drawer-link {
  display: block;
  padding: 16px 0;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-faint);
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.drawer-link:hover {
  color: var(--gold);
  padding-left: 8px;
}

.drawer-cta {
  margin-top: 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  text-align: center;
  padding: 16px;
}

.drawer-cta:hover {
  background: var(--gold);
  color: var(--bg-deepest);
  border-color: var(--gold);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gold);
  color: var(--bg-deepest);
  border: 1px solid var(--gold);
}

.btn-primary:hover {
  background: var(--gold-bright);
  box-shadow: 0 0 30px var(--gold-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ---------- 通用板块 ---------- */
.section {
  padding: var(--space-section) 0;
  position: relative;
}

.section-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 48px;
}

.section-head {
  margin-bottom: 72px;
}

.section-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--gold);
  margin-bottom: 20px;
  padding-left: 32px;
  position: relative;
}

.section-index::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 24px;
  height: 1px;
  background: var(--gold);
}

.section-title {
  font-family: var(--font-serif-cn);
  font-size: 48px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.title-sup {
  color: var(--gold);
  font-size: 28px;
  margin: 0 8px;
}

.section-desc {
  margin-top: 20px;
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
}

/* ============================================
   首屏 Hero
   ============================================ */
.hero {
  height: 100vh;
  min-height: 700px;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201,169,97,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,169,97,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 800px;
  height: 800px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(201,169,97,0.12) 0%, transparent 60%);
  filter: blur(40px);
}

.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--gold);
  border-radius: 50%;
  opacity: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 48px;
  width: 100%;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.eyebrow-line {
  width: 48px;
  height: 1px;
  background: var(--gold);
}

.hero-title {
  font-family: var(--font-serif-cn);
  font-size: 88px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.04em;
  margin-bottom: 36px;
}

.title-line {
  display: block;
}

.title-accent {
  color: var(--gold);
  font-style: italic;
  font-family: var(--font-display);
}

.hero-sub {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.9;
  margin-bottom: 48px;
}

.hero-actions {
  display: flex;
  gap: 20px;
}

.hero-scroll {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 2;
}

.scroll-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--text-tertiary);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(var(--gold), transparent);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: "";
  position: absolute;
  top: -60px;
  left: 0;
  width: 100%;
  height: 60px;
  background: linear-gradient(var(--gold-bright), transparent);
  animation: scrollDown 2s var(--ease-out) infinite;
}

@keyframes scrollDown {
  to { top: 60px; }
}

.hero-corner {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--text-faint);
  z-index: 2;
}

.hero-corner-tl { top: 120px; left: 48px; }
.hero-corner-br { bottom: 48px; right: 48px; }

/* ============================================
   关于我们
   ============================================ */
.about {
  background: var(--bg-base);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-left {
  position: sticky;
  top: 120px;
}

.about-lead {
  font-family: var(--font-serif-cn);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-faint);
}

.about-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 2;
}

.about-right {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.value-card {
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: 2px;
  position: relative;
  transition: all var(--transition-base);
}

.value-card:hover {
  border-color: var(--border-subtle);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.value-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 1px;
  background: var(--gold);
}

.value-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}

.value-title {
  font-family: var(--font-serif-cn);
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.value-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   核心技术
   ============================================ */
.tech {
  background: var(--bg-deepest);
}

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

.tech-card {
  padding: 48px 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: 2px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.tech-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, var(--gold-dim), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.tech-card:hover {
  border-color: var(--border-subtle);
  transform: translateY(-8px);
}

.tech-card:hover::before {
  opacity: 1;
}

.tech-card-featured {
  background: linear-gradient(180deg, var(--bg-card-hover), var(--bg-card));
  border-color: var(--border-subtle);
}

.tech-icon {
  width: 48px;
  height: 48px;
  color: var(--gold);
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.tech-icon svg {
  width: 100%;
  height: 100%;
}

.tech-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
  margin-bottom: 12px;
  letter-spacing: 0.15em;
  position: relative;
  z-index: 1;
}

.tech-name {
  font-family: var(--font-serif-cn);
  font-size: 26px;
  font-weight: 500;
  margin-bottom: 16px;
  color: var(--text-primary);
  position: relative;
  z-index: 1;
}

.tech-summary {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.tech-details {
  list-style: none;
  position: relative;
  z-index: 1;
}

.tech-details li {
  font-size: 13px;
  color: var(--text-tertiary);
  padding: 8px 0;
  padding-left: 20px;
  border-top: 1px solid var(--border-faint);
  position: relative;
  transition: color var(--transition-base);
}

.tech-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

.tech-card:hover .tech-details li {
  color: var(--text-secondary);
}

/* ============================================
   解决方案
   ============================================ */
.solutions {
  background: var(--bg-base);
}

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

.sol-card {
  position: relative;
  height: 320px;
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--border-faint);
  cursor: pointer;
}

.sol-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.25;
  filter: grayscale(60%) brightness(0.6);
  transition: all var(--transition-slow);
}

.sol-card:hover .sol-bg {
  opacity: 0.5;
  filter: grayscale(0%) brightness(0.8);
  transform: scale(1.05);
}

.sol-content {
  position: relative;
  z-index: 2;
  height: 100%;
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: linear-gradient(180deg, transparent 40%, rgba(10,10,11,0.9));
}

.sol-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  margin-bottom: 12px;
  letter-spacing: 0.15em;
}

.sol-name {
  font-family: var(--font-serif-cn);
  font-size: 32px;
  font-weight: 500;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.sol-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 380px;
}

.sol-arrow {
  position: absolute;
  top: 40px;
  right: 40px;
  font-size: 24px;
  color: var(--gold);
  opacity: 0;
  transform: translate(-12px, 12px);
  transition: all var(--transition-base);
}

.sol-card:hover .sol-arrow {
  opacity: 1;
  transform: translate(0, 0);
}

.sol-card:hover {
  border-color: var(--gold);
}

/* ============================================
   案例展示
   ============================================ */
.cases {
  background: var(--bg-deepest);
}

.cases-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: 2px;
  overflow: hidden;
  transition: all var(--transition-base);
}

.case-card:hover {
  border-color: var(--border-subtle);
  transform: translateY(-6px);
}

.case-img {
  height: 240px;
  background-size: cover;
  background-position: center;
  filter: grayscale(40%) brightness(0.7);
  transition: all var(--transition-slow);
}

.case-card:hover .case-img {
  filter: grayscale(0%) brightness(0.9);
  transform: scale(1.05);
}

.case-body {
  padding: 28px;
}

.case-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
  padding: 4px 10px;
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}

.case-title {
  font-family: var(--font-serif-cn);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.case-result {
  font-size: 13px;
  color: var(--text-secondary);
}

.case-num {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 16px;
  font-weight: 500;
}

/* ============================================
   数据亮点
   ============================================ */
.stats {
  background: var(--bg-base);
  position: relative;
  overflow: hidden;
}

.stats::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1000px;
  height: 1000px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, var(--gold-dim), transparent 60%);
  filter: blur(60px);
  pointer-events: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}

.stat-item {
  text-align: center;
  padding: 40px 24px;
  border-right: 1px solid var(--border-faint);
}

.stat-item:last-child {
  border-right: none;
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 300;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.stat-label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.stat-line {
  display: block;
  width: 40px;
  height: 1px;
  background: var(--gold);
  margin: 0 auto;
}

/* ============================================
   合作伙伴
   ============================================ */
.partners {
  background: var(--bg-deepest);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border: 1px solid var(--border-faint);
  border-radius: 2px;
}

.partner-logo {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif-cn);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-tertiary);
  border-right: 1px solid var(--border-faint);
  border-bottom: 1px solid var(--border-faint);
  transition: all var(--transition-base);
  background: var(--bg-card);
}

.partner-logo:nth-child(5n) { border-right: none; }
.partner-logo:nth-last-child(-n+5) { border-bottom: none; }

.partner-logo:hover {
  color: var(--gold);
  background: var(--bg-card-hover);
}

/* ============================================
   联系我们
   ============================================ */
.contact {
  background: var(--bg-base);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.contact-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-faint);
}

.contact-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: var(--gold);
}

.contact-icon svg {
  width: 100%;
  height: 100%;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.15em;
  margin-bottom: 8px;
}

.contact-value {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 400;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: 2px;
  padding: 40px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  margin-bottom: 10px;
  letter-spacing: 0.1em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-deepest);
  border: 1px solid var(--border-faint);
  border-radius: 2px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  transition: border-color var(--transition-base);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-faint);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--gold);
}

.form-submit {
  width: 100%;
  margin-top: 8px;
}

.form-note {
  margin-top: 16px;
  font-size: 13px;
  text-align: center;
  min-height: 20px;
  color: var(--gold);
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-deepest);
  border-top: 1px solid var(--border-faint);
  padding: 64px 0 32px;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 48px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border-faint);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-name {
  font-family: var(--font-serif-cn);
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
}

.footer-sub {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
  letter-spacing: 0.15em;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  padding: 6px 0;
  transition: color var(--transition-base);
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 32px 48px 0;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-faint);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1023px) {
  .nav-menu { display: none; }
  .nav-toggle { display: flex; }
  .nav-container { padding: 0 32px; }

  .hero-title { font-size: 56px; }
  .hero-sub { font-size: 15px; }
  .hero-corner-tl, .hero-corner-br { display: none; }

  .section { padding: 96px 0; }
  .section-inner { padding: 0 32px; }
  .section-title { font-size: 36px; }
  .section-head { margin-bottom: 48px; }

  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-left { position: static; }
  .about-lead { font-size: 22px; }

  .tech-grid { grid-template-columns: 1fr; }

  .sol-grid { grid-template-columns: 1fr; }
  .sol-card { height: 260px; }

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

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border-faint); }
  .stat-item:nth-last-child(-n+2) { border-bottom: none; }
  .stat-num { font-size: 48px; }

  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .partner-logo:nth-child(5n) { border-right: 1px solid var(--border-faint); }
  .partner-logo:nth-child(3n) { border-right: none; }
  .partner-logo:nth-last-child(-n+5) { border-bottom: 1px solid var(--border-faint); }
  .partner-logo:nth-last-child(-n+3) { border-bottom: none; }

  .contact-grid { grid-template-columns: 1fr; gap: 48px; }

  .footer-inner { grid-template-columns: 1fr; gap: 40px; padding: 0 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; padding: 32px 32px 0; }
}

@media (max-width: 640px) {
  .nav-container { padding: 0 20px; }
  .section-inner { padding: 0 20px; }

  .hero-title { font-size: 40px; }
  .hero-eyebrow { font-size: 10px; }
  .hero-sub { font-size: 14px; }
  .hero-actions { flex-direction: column; gap: 12px; }
  .hero-actions .btn { width: 100%; }

  .section-title { font-size: 28px; }
  .title-sup { font-size: 20px; }

  .cases-track { grid-template-columns: 1fr; }

  .stats-grid { grid-template-columns: 1fr; }
  .stat-item { border-bottom: 1px solid var(--border-faint); }
  .stat-item:last-child { border-bottom: none; }
  .stat-num { font-size: 40px; }

  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-logo:nth-child(3n) { border-right: 1px solid var(--border-faint); }
  .partner-logo:nth-child(2n) { border-right: none; }

  .contact-form { padding: 24px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }

  .footer-inner { padding: 0 20px; }
  .footer-bottom { padding: 24px 20px 0; }
  .footer-links { grid-template-columns: 1fr; gap: 24px; }

  .value-card { padding: 28px; }
  .sol-content { padding: 28px; }
  .sol-name { font-size: 24px; }
}