/* ============================================
   闫宝龙·西安GEO优化 - 主样式
   设计风格：Editorial × Tech-Minimalism
   配色：墨黑 #0A0A0A / 米白 #FAFAF7 / 雾金 #B8935A
   ============================================ */

:root {
  --ink: #0a0a0a;
  --ink-2: #1a1a18;
  --ink-3: #2c2c2a;
  --paper: #fafaf7;
  --paper-2: #f2f0ea;
  --paper-3: #e8e5dc;
  --line: #d8d4c7;
  --muted: #8b8b87;
  --text: #4a4a48;
  --text-2: #6b6b66;
  --gold: #b8935a;
  --gold-2: #9c7d48;
  --gold-soft: #d9c29a;
  --max: 1240px;
  --gutter: 24px;
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 0.2s;
  --t-mid: 0.5s;
  --t-slow: 0.9s;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans:
    "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --display: "Cormorant Garamond", "Noto Serif SC", Georgia, serif;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--paper);
  font-weight: 400;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg {
  display: block;
  max-width: 100%;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
ul,
ol {
  list-style: none;
}
button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

em {
  font-style: italic;
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 500;
}

/* ============================================
   导航 + Hero 头部
   ============================================ */

.site-header {
  position: relative;
  min-height: 100vh;
  background: var(--paper);
  overflow: hidden;
}

.nav-wrap {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--t-mid) var(--ease),
    background var(--t-mid) var(--ease);
}

.nav-wrap.is-scrolled {
  background: rgba(250, 250, 247, 0.95);
  border-bottom-color: var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 32px;
}

/* Logo */
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--serif);
  color: var(--ink);
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-mark {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1;
  position: relative;
  color: var(--ink);
  letter-spacing: 0.08em;
}

.reg-mark {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 500;
  vertical-align: super;
  color: var(--gold);
  margin-left: 2px;
  position: relative;
  top: -6px;
  letter-spacing: 0;
}

.brand-divider {
  color: var(--line);
  font-weight: 300;
  font-size: 20px;
  font-family: var(--sans);
}

.brand-name {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--ink);
}

/* 主导航 */
.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 28px;
}

.primary-nav a {
  font-size: 13.5px;
  font-weight: 400;
  color: var(--text);
  position: relative;
  padding: 6px 0;
  letter-spacing: 0.05em;
}

.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--t-mid) var(--ease);
}

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

.primary-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* 导航 CTA */
.nav-cta {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
  padding: 8px 16px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  transition:
    background var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}

.nav-cta:hover {
  background: transparent;
  color: var(--ink);
}

.cta-label {
  font-size: 10px;
  letter-spacing: 0.2em;
  opacity: 0.7;
  text-transform: uppercase;
  font-weight: 400;
}

.cta-value {
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* 移动端导航 */
.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition:
    transform var(--t-fast) var(--ease),
    opacity var(--t-fast) var(--ease);
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 120px 0 80px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(10, 10, 10, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(10, 10, 10, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(
    ellipse at center,
    black 30%,
    transparent 80%
  );
}

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 70%;
  height: 70%;
  background: radial-gradient(
    circle,
    rgba(184, 147, 90, 0.12) 0%,
    transparent 60%
  );
  filter: blur(40px);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1100px;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-2);
  font-weight: 500;
}

.meta-tag {
  padding: 4px 10px;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 10.5px;
}

.meta-line {
  flex: 0 0 60px;
  height: 1px;
  background: var(--line);
}

.meta-text {
  color: var(--text-2);
  font-family: var(--serif);
  font-style: italic;
  letter-spacing: 0.1em;
  text-transform: none;
  font-size: 13px;
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(40px, 6.4vw, 92px);
  line-height: 1.15;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 36px;
}

.title-row {
  display: block;
  opacity: 0;
  transform: translateY(40px);
  animation: revealUp 1s var(--ease-out) forwards;
}

.title-row-1 {
  animation-delay: 0.2s;
}
.title-row-2 {
  animation-delay: 0.4s;
}
.title-row-3 {
  animation-delay: 0.6s;
}

.title-row em {
  font-family: var(--display);
  font-style: italic;
  color: var(--gold);
  font-weight: 500;
  position: relative;
  padding: 0 0.05em;
}

.hero-sub {
  max-width: 640px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 44px;
  opacity: 0;
  animation: revealUp 1s var(--ease-out) 0.8s forwards;
  transform: translateY(20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 80px;
  opacity: 0;
  animation: revealUp 1s var(--ease-out) 1s forwards;
  transform: translateY(20px);
}

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

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  border-radius: var(--radius);
  transition: all var(--t-mid) var(--ease);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}

.btn-primary:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
  transform: translateY(-1px);
}

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

.btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-1px);
}

.btn svg {
  transition: transform var(--t-fast) var(--ease);
}

.btn:hover svg {
  transform: translate(2px, -2px);
}

/* Hero 统计 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  padding-top: 40px;
  opacity: 0;
  animation: revealUp 1s var(--ease-out) 1.2s forwards;
  transform: translateY(20px);
}

.stat {
  border-left: 1px solid var(--line);
  padding-left: 24px;
}

.stat:first-child {
  border-left: none;
  padding-left: 0;
}

.stat dt {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 12px;
  font-weight: 500;
}

.stat dd {
  font-family: var(--display);
  font-size: clamp(40px, 4.5vw, 64px);
  font-weight: 500;
  color: var(--ink);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat dd sup {
  font-size: 0.4em;
  font-weight: 500;
  color: var(--gold);
  margin-left: 2px;
  top: -0.5em;
  position: relative;
}

/* 滚动提示 */
.hero-scroll {
  position: absolute;
  bottom: 32px;
  right: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--text-2);
  z-index: 2;
  font-weight: 500;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  font-family: var(--mono);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--ink), transparent);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: "";
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gold);
  animation: scrollLine 2.5s var(--ease-out) infinite;
}

@keyframes scrollLine {
  0% {
    top: -100%;
  }
  100% {
    top: 100%;
  }
}

/* ============================================
   通用 section
   ============================================ */

.section {
  padding: 120px 0;
  position: relative;
}

.section-head {
  max-width: 820px;
  margin-bottom: 80px;
}

.section-num {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--gold);
  margin-bottom: 24px;
  font-weight: 500;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(32px, 4.2vw, 56px);
  line-height: 1.2;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}

.section-title em {
  font-family: var(--display);
  color: var(--gold);
  font-style: italic;
  font-weight: 500;
}

.section-lead {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text-2);
  max-width: 640px;
}

/* ============================================
   01 核心业务
   ============================================ */

.section-services {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.service-card {
  padding: 48px 40px 56px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background var(--t-mid) var(--ease);
}

.service-card:hover {
  background: var(--paper-2);
}

.card-num {
  font-family: var(--display);
  font-size: 14px;
  color: var(--gold);
  font-style: italic;
  margin-bottom: 24px;
  letter-spacing: 0.05em;
}

.service-card h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 16px;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.service-card > p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-2);
  margin-bottom: 24px;
}

.card-list {
  border-top: 1px dashed var(--line);
  padding-top: 20px;
}

.card-list li {
  font-size: 13px;
  color: var(--text);
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
}

.card-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 12px;
}

/* ============================================
   02 对比
   ============================================ */

.section-compare {
  background: var(--ink);
  color: var(--paper);
}

.section-compare .section-num {
  color: var(--gold-soft);
}
.section-compare .section-title {
  color: var(--paper);
}
.section-compare .section-title em {
  color: var(--gold-soft);
}
.section-compare .section-lead {
  color: rgba(250, 250, 247, 0.6);
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  border-top: 1px solid rgba(250, 250, 247, 0.15);
}

.compare-col {
  padding: 56px 48px;
  border-right: 1px solid rgba(250, 250, 247, 0.15);
}

.compare-col-featured {
  background: linear-gradient(
    180deg,
    rgba(184, 147, 90, 0.06) 0%,
    rgba(184, 147, 90, 0) 100%
  );
  position: relative;
}

.compare-col-featured::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold);
}

.compare-tag {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.5);
  margin-bottom: 24px;
}

.compare-col-featured .compare-tag {
  color: var(--gold-soft);
}

.compare-col h3 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  margin-bottom: 32px;
  letter-spacing: 0.01em;
}

.compare-col-featured h3 {
  color: var(--gold-soft);
}

.compare-col ul li {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(250, 250, 247, 0.7);
  padding: 14px 0;
  border-bottom: 1px solid rgba(250, 250, 247, 0.08);
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.compare-col ul li span {
  color: var(--gold);
  font-family: var(--display);
  font-style: italic;
  flex-shrink: 0;
}

.compare-col-featured ul li {
  color: rgba(250, 250, 247, 0.9);
}

.compare-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  font-family: var(--display);
  font-size: 32px;
  color: var(--gold);
  font-style: italic;
}

/* ============================================
   03 流程
   ============================================ */

.section-process {
  background: var(--paper-2);
}

.process-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.process-item {
  padding: 48px 32px 48px 0;
  border-right: 1px solid var(--line);
  padding-right: 32px;
  position: relative;
}

.process-item:nth-child(3n) {
  border-right: none;
  padding-right: 0;
}
.process-item:not(:nth-child(3n)) {
  padding-right: 40px;
}

.process-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--gold);
  margin-bottom: 24px;
  display: block;
  font-weight: 500;
}

.process-item h3 {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}

.process-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
}

/* ============================================
   04 平台矩阵
   ============================================ */

.section-platforms {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.plat-group {
  padding: 48px 40px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.plat-title {
  font-family: var(--display);
  font-size: 18px;
  font-style: italic;
  color: var(--gold);
  margin-bottom: 28px;
  font-weight: 500;
}

.plat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.plat-list li {
  font-size: 14px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all var(--t-fast) var(--ease);
}

.plat-list li:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* ============================================
   05 优势
   ============================================ */

.section-advantages {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.adv-item {
  padding: 48px 36px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background var(--t-mid) var(--ease);
}

.adv-item:hover {
  background: var(--paper);
}

.adv-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink);
  margin-bottom: 28px;
  color: var(--ink);
  transition: all var(--t-mid) var(--ease);
}

.adv-item:hover .adv-icon {
  background: var(--ink);
  color: var(--paper);
  transform: rotate(45deg);
}

.adv-item:hover .adv-icon svg {
  transform: rotate(-45deg);
}

.adv-icon svg {
  transition: transform var(--t-mid) var(--ease);
}

.adv-item h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}

.adv-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
}

/* ============================================
   06 行业
   ============================================ */

.section-industries {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.industry-card {
  padding: 40px 32px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: all var(--t-mid) var(--ease);
  cursor: default;
}

.industry-card:hover {
  background: var(--ink);
  color: var(--paper);
}

.industry-card:hover .ind-num {
  color: var(--gold-soft);
}
.industry-card:hover h3 {
  color: var(--paper);
}

.ind-num {
  font-family: var(--display);
  font-size: 14px;
  font-style: italic;
  color: var(--gold);
  margin-bottom: 16px;
  display: block;
  transition: color var(--t-fast) var(--ease);
}

.industry-card h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 10px;
  letter-spacing: 0.01em;
  transition: color var(--t-fast) var(--ease);
}

.industry-card p {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-2);
  transition: color var(--t-fast) var(--ease);
}

.industry-card:hover p {
  color: rgba(250, 250, 247, 0.7);
}

/* ============================================
   07 案例
   ============================================ */

.section-cases {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

.case-card {
  background: var(--paper);
  padding: 40px 36px;
  border: 1px solid var(--line);
  transition: all var(--t-mid) var(--ease);
  position: relative;
}

.case-card:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  transform: translateY(-4px);
}

.case-card:hover .case-meta,
.case-card:hover .case-tag {
  color: var(--gold-soft);
  border-color: var(--gold-soft);
}

.case-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 20px;
  transition: color var(--t-fast) var(--ease);
}

.case-card h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 14px;
  line-height: 1.4;
  transition: color var(--t-fast) var(--ease);
}

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

.case-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
  margin-bottom: 24px;
  transition: color var(--t-fast) var(--ease);
}

.case-card:hover p {
  color: rgba(250, 250, 247, 0.75);
}

.case-tag {
  display: inline-block;
  font-size: 11px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  color: var(--text);
  letter-spacing: 0.1em;
  font-family: var(--mono);
  transition: all var(--t-fast) var(--ease);
}

.case-disclaimer {
  font-size: 12.5px;
  color: var(--text-2);
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-style: italic;
  font-family: var(--serif);
}

/* ============================================
   08 关于闫宝龙
   ============================================ */

.section-about {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.about-wrap {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 80px;
  align-items: start;
}

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

.about-portrait img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: grayscale(20%) contrast(1.05);
  border: 1px solid var(--line);
  transition: filter var(--t-slow) var(--ease);
}

.about-portrait:hover img {
  filter: grayscale(0%) contrast(1);
}

.about-portrait figcaption {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.portrait-name {
  display: block;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.portrait-role {
  display: block;
  font-size: 12px;
  color: var(--text-2);
  letter-spacing: 0.15em;
}

.about-lead {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.65;
  color: var(--ink);
  margin-bottom: 40px;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.about-grid {
  margin-bottom: 40px;
}

.about-list > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}

.about-list > div:last-child {
  border-bottom: 1px solid var(--line);
}

.about-list dt {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.1em;
  font-weight: 500;
}

.about-list dd {
  font-size: 15px;
  color: var(--text);
  line-height: 1.7;
}

.about-closing {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
  padding: 32px 0 0;
  border-top: 1px solid var(--line);
}

.about-closing em {
  font-family: var(--display);
  color: var(--gold);
  font-weight: 500;
  font-style: italic;
}

/* ============================================
   09 FAQ
   ============================================ */

.section-faq {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
  transition: background var(--t-fast) var(--ease);
}

.faq-item[open] {
  background: var(--paper);
}

.faq-item summary {
  list-style: none;
  display: grid;
  grid-template-columns: 80px 1fr 32px;
  gap: 24px;
  align-items: center;
  padding: 28px 8px;
  cursor: pointer;
  transition: padding var(--t-mid) var(--ease);
}

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

.faq-item summary:hover {
  padding-left: 16px;
}

.faq-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.15em;
  font-weight: 500;
}

.faq-q {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.5;
  letter-spacing: 0.01em;
}

.faq-toggle {
  width: 28px;
  height: 28px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  position: relative;
  transition: all var(--t-fast) var(--ease);
}

.faq-toggle::before,
.faq-toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 1.5px;
  background: var(--ink);
  transform: translate(-50%, -50%);
  transition: transform var(--t-fast) var(--ease);
}

.faq-toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item[open] .faq-toggle {
  background: var(--ink);
}

.faq-item[open] .faq-toggle::before {
  background: var(--paper);
}
.faq-item[open] .faq-toggle::after {
  transform: translate(-50%, -50%) rotate(0);
  opacity: 0;
}

.faq-a {
  padding: 0 8px 36px 112px;
  max-width: 880px;
}

.faq-a p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* ============================================
   10 联系方式
   ============================================ */

.section-contact {
  background: var(--ink);
  color: var(--paper);
}

.section-contact .section-num {
  color: var(--gold-soft);
}
.section-contact .section-title {
  color: var(--paper);
}
.section-contact .section-title em {
  color: var(--gold-soft);
}
.section-contact .section-lead {
  color: rgba(250, 250, 247, 0.65);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 80px;
  align-items: start;
  border-top: 1px solid rgba(250, 250, 247, 0.15);
  padding-top: 80px;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-left: 1px solid rgba(250, 250, 247, 0.15);
  border-top: 1px solid rgba(250, 250, 247, 0.15);
}

.contact-item {
  padding: 36px 32px;
  border-right: 1px solid rgba(250, 250, 247, 0.15);
  border-bottom: 1px solid rgba(250, 250, 247, 0.15);
}

.contact-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--gold-soft);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.contact-value {
  display: block;
  font-family: var(--serif);
  font-size: 24px;
  color: var(--paper);
  margin-bottom: 6px;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color var(--t-fast) var(--ease);
}

a.contact-value:hover {
  color: var(--gold-soft);
}

.contact-tip {
  font-size: 12px;
  color: rgba(250, 250, 247, 0.45);
  letter-spacing: 0.05em;
}

.contact-qr {
  text-align: center;
  padding: 32px;
  border: 1px solid rgba(250, 250, 247, 0.15);
  background: rgba(250, 250, 247, 0.02);
}

.contact-qr img {
  width: 200px;
  height: 200px;
  margin: 0 auto 20px;
  display: block;
}

.qr-label {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--paper);
  margin-bottom: 4px;
  font-weight: 500;
}

.qr-sub {
  font-family: var(--mono);
  font-size: 10px;
  color: rgba(250, 250, 247, 0.4);
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

/* ============================================
   11 更多服务
   ============================================ */

.section-more {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.more-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.more-card {
  padding: 24px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all var(--t-fast) var(--ease);
  min-height: 120px;
  justify-content: space-between;
}

.more-card:hover {
  background: var(--ink);
  color: var(--paper);
}

.more-card:hover .more-name {
  color: var(--paper);
}
.more-card:hover .more-url {
  color: var(--gold-soft);
}
.more-card:hover .more-tag {
  color: var(--gold-soft);
  border-color: var(--gold-soft);
}

.more-card-current {
  background: var(--paper-2);
}

.more-card-current:hover {
  background: var(--ink);
}

.more-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 8px;
  align-self: flex-start;
  border: 1px solid var(--gold);
  padding: 2px 6px;
  transition: all var(--t-fast) var(--ease);
}

.more-name {
  font-family: var(--serif);
  font-size: 14.5px;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 2px;
  transition: color var(--t-fast) var(--ease);
  line-height: 1.4;
}

.more-url {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-2);
  letter-spacing: 0.05em;
  transition: color var(--t-fast) var(--ease);
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  background: var(--ink-2);
  color: rgba(250, 250, 247, 0.7);
  padding: 80px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(250, 250, 247, 0.1);
}

.footer-brand .brand {
  color: var(--paper);
}
.footer-brand .brand-mark {
  color: var(--paper);
}
.footer-brand .brand-name {
  color: var(--paper);
}
.footer-brand .brand-divider {
  color: rgba(250, 250, 247, 0.3);
}

.footer-tag {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  color: var(--gold-soft);
  margin: 20px 0 12px;
  font-weight: 500;
}

.footer-sub {
  font-size: 13px;
  color: rgba(250, 250, 247, 0.55);
  line-height: 1.7;
}

.footer-col h4 {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--paper);
  margin-bottom: 20px;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.footer-col ul li {
  font-size: 13px;
  padding: 6px 0;
  color: rgba(250, 250, 247, 0.55);
}

.footer-col ul li a {
  color: rgba(250, 250, 247, 0.7);
  transition: color var(--t-fast) var(--ease);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  font-size: 12.5px;
  color: rgba(250, 250, 247, 0.45);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom a {
  color: rgba(250, 250, 247, 0.7);
  transition: color var(--t-fast) var(--ease);
}

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

.copyright,
.beian {
  font-family: var(--sans);
  letter-spacing: 0.02em;
}

/* ============================================
   返回顶部
   ============================================ */

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-family: var(--mono);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: all var(--t-mid) var(--ease);
  z-index: 99;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--gold);
  color: var(--ink);
  transform: translateY(-2px);
}

/* ============================================
   响应式
   ============================================ */

@media (max-width: 1024px) {
  .nav-inner {
    gap: 16px;
  }
  .primary-nav ul {
    gap: 18px;
  }
  .primary-nav a {
    font-size: 12.5px;
  }
  .section {
    padding: 80px 0;
  }
  .section-head {
    margin-bottom: 56px;
  }
  .service-grid,
  .platforms-grid,
  .adv-grid,
  .industry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .process-item:nth-child(3n) {
    border-right: 1px solid var(--line);
    padding-right: 32px;
  }
  .process-item:nth-child(2n) {
    border-right: none;
    padding-right: 0;
  }
  .more-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .compare-grid {
    grid-template-columns: 1fr;
  }
  .compare-col {
    border-right: none;
    border-bottom: 1px solid rgba(250, 250, 247, 0.15);
  }
  .compare-divider {
    width: 100%;
    height: 60px;
    writing-mode: horizontal-tb;
  }
  .about-wrap {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .about-portrait {
    position: relative;
    top: 0;
    max-width: 320px;
    margin: 0 auto;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .case-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
  }
  body {
    font-size: 15px;
  }
  .nav-inner {
    height: 60px;
  }
  .nav-cta {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .primary-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    transform: translateY(-100%);
    transition: transform var(--t-mid) var(--ease);
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }
  .primary-nav.is-open {
    transform: translateY(0);
  }
  .primary-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 0;
  }
  .primary-nav a {
    display: block;
    padding: 14px 24px;
    border-bottom: 1px solid var(--line);
    font-size: 14px;
  }
  .primary-nav ul li:last-child a {
    border-bottom: none;
  }
  .primary-nav a::after {
    display: none;
  }

  .hero {
    min-height: 90vh;
    padding: 100px 0 60px;
  }
  .hero-title {
    font-size: clamp(32px, 9vw, 56px);
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 0;
  }
  .stat {
    padding-left: 16px;
  }
  .stat dd {
    font-size: 36px;
  }
  .hero-scroll {
    display: none;
  }

  .section {
    padding: 64px 0;
  }
  .section-head {
    margin-bottom: 40px;
  }
  .section-title {
    font-size: 30px;
  }

  .service-grid,
  .platforms-grid,
  .adv-grid,
  .industry-grid {
    grid-template-columns: 1fr;
  }
  .process-list {
    grid-template-columns: 1fr;
  }
  .process-item,
  .process-item:nth-child(3n) {
    border-right: none;
    padding-right: 0;
    padding-bottom: 32px;
    margin-bottom: 0;
  }
  .more-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-info {
    grid-template-columns: 1fr;
  }

  .faq-item summary {
    grid-template-columns: 56px 1fr 24px;
    gap: 12px;
    padding: 20px 4px;
  }
  .faq-q {
    font-size: 16px;
  }
  .faq-a {
    padding: 0 4px 24px 72px;
  }
  .faq-a p {
    font-size: 14px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .back-to-top {
    width: 40px;
    height: 40px;
    bottom: 20px;
    right: 20px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .more-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }
  .btn {
    padding: 12px 20px;
    font-size: 13px;
  }
  .cta-value {
    font-size: 12px;
  }
}

/* 减少动效 */
@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;
  }
  .title-row,
  .hero-sub,
  .hero-actions,
  .hero-stats {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* 滚动揭示动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 1s var(--ease-out),
    transform 1s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.1s;
}
.reveal-delay-2 {
  transition-delay: 0.2s;
}
.reveal-delay-3 {
  transition-delay: 0.3s;
}
.reveal-delay-4 {
  transition-delay: 0.4s;
}