/* ============================================================
   极瞰未来官网样式
   风格：暖纸白 + 墨黑 + 古铜金点缀，编辑部式排版，克制而高级
   ============================================================ */

:root {
  --ink: #1c1b17;          /* 主文字：暖墨黑 */
  --ink-soft: #57544b;     /* 次级文字 */
  --ink-faint: #94907f;    /* 弱化文字 */
  --accent: #a05f2c;       /* 古铜金 */
  --accent-deep: #7c4720;
  --accent-tint: rgba(160, 95, 44, 0.08);
  --bg: #fbfaf6;           /* 暖纸白 */
  --bg-alt: #f3f1e9;       /* 米灰分区 */
  --bg-dark: #1b1a16;      /* 暖炭黑分区 */
  --line: #e6e2d6;         /* 分隔线 */
  --radius: 14px;
  --shadow: 0 1px 2px rgba(28, 27, 23, 0.04), 0 10px 28px rgba(28, 27, 23, 0.06);
  --shadow-hover: 0 4px 8px rgba(28, 27, 23, 0.06), 0 22px 48px rgba(28, 27, 23, 0.12);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

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

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

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

.container {
  width: min(1160px, 92%);
  margin: 0 auto;
}

/* 强调文字：古铜金实色 */
.grad-text { color: var(--accent); }

/* ============ 顶部导航 ============ */
/* 默认透明，悬浮在 Hero 轮播之上；滚动后切换为浅色毛玻璃 */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.35s, border-color 0.35s, box-shadow 0.35s;
}

.site-header.scrolled {
  background: rgba(251, 250, 246, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
  box-shadow: 0 4px 20px rgba(28, 27, 23, 0.05);
}

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

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

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: rgba(245, 239, 228, 0.14);
  border: 1px solid rgba(245, 239, 228, 0.3);
  color: #f5efe4;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  transition: background 0.35s, border-color 0.35s, color 0.35s;
}

.site-header.scrolled .logo-mark {
  background: var(--ink);
  border-color: var(--ink);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  font-size: 17px;
  font-weight: 700;
  color: #f5efe4;
  transition: color 0.35s;
}

.site-header.scrolled .logo-text { color: var(--ink); }

.logo-text em {
  font-style: normal;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2.5px;
  color: rgba(245, 239, 228, 0.55);
  transition: color 0.35s;
}

.site-header.scrolled .logo-text em { color: var(--ink-faint); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.main-nav a {
  padding: 8px 16px;
  font-size: 15px;
  color: rgba(245, 239, 228, 0.82);
  border-radius: 8px;
  transition: color 0.25s, background 0.25s, border-color 0.25s;
}

.main-nav a:hover {
  color: #fff;
  background: rgba(245, 239, 228, 0.1);
}

.site-header.scrolled .main-nav a { color: var(--ink-soft); }

.site-header.scrolled .main-nav a:hover {
  color: var(--ink);
  background: var(--bg-alt);
}

.main-nav .nav-cta {
  margin-left: 8px;
  background: transparent;
  border: 1px solid rgba(245, 239, 228, 0.45);
  color: #f5efe4;
  font-weight: 500;
}

.main-nav .nav-cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.site-header.scrolled .main-nav .nav-cta {
  background: var(--ink);
  border-color: var(--ink);
  color: #f5efe4;
}

.site-header.scrolled .main-nav .nav-cta:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: #fff;
}

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

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: #f5efe4;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s, background 0.35s;
}

.site-header.scrolled .nav-toggle span { background: var(--ink); }

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero：沉浸式轮播 ============ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 660px;
  max-height: 1000px;
  background: var(--bg-dark);
  overflow: hidden;
}

/* ---------- 幻灯片背景层 ---------- */
.hero-slides { position: absolute; inset: 0; }

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.2s ease;
}

.hero-slide.active {
  opacity: 1;
  z-index: 1;
}

/* 照片层：真实摄影图（加载前以深色兜底） */
.hero-slide { background: #17150f; }

.hero-slide img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 激活帧缓慢缩放，营造沉浸感 */
.hero-slide.active img {
  animation: kenBurns 7s ease-out both;
}

@keyframes kenBurns {
  from { transform: scale(1.06); }
  to   { transform: scale(1); }
}

/* ---------- 深色遮罩：保证文字与导航可读 ---------- */
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    linear-gradient(180deg, rgba(20, 18, 14, 0.4) 0%, rgba(20, 18, 14, 0.02) 24%, rgba(20, 18, 14, 0.3) 100%),
    linear-gradient(90deg, rgba(20, 18, 14, 0.66) 0%, rgba(20, 18, 14, 0.34) 42%, rgba(20, 18, 14, 0.06) 100%);
}

/* ---------- 文案层 ---------- */
.hero-content {
  position: relative;
  z-index: 3;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 110px 0 120px;
}

.hero-copies {
  position: relative;
  max-width: 660px;
  min-height: 330px;
}

.hero-copy {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
  pointer-events: none;
}

.hero-copy.active {
  opacity: 1;
  transform: none;
  pointer-events: auto;
  transition-delay: 0.3s;
}

/* ---------- Hero 文案（深色背景） ---------- */
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 18px;
  border: 1px solid rgba(245, 239, 228, 0.28);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 2px;
  color: rgba(245, 239, 228, 0.92);
  background: rgba(245, 239, 228, 0.08);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  margin-bottom: 28px;
}

.kicker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d99a5b;
  animation: pulse 2.6s ease-in-out infinite;
}

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

.hero-title {
  font-size: clamp(34px, 4.8vw, 58px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: 1px;
  color: #f7f3ea;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
}

.hero .grad-text { color: #e3ab6d; }

.hero-sub {
  max-width: 560px;
  margin-top: 24px;
  font-size: 16.5px;
  color: rgba(245, 239, 228, 0.78);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 38px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 34px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.25s, color 0.25s, transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fdf8ef;
  box-shadow: 0 6px 20px rgba(160, 95, 44, 0.4);
}

.btn-primary:hover {
  background: #b06c33;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(160, 95, 44, 0.5);
}

.btn-arrow { transition: transform 0.25s; }

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

.btn-ghost.light {
  border: 1px solid rgba(245, 239, 228, 0.4);
  color: #f5efe4;
  background: rgba(245, 239, 228, 0.06);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.btn-ghost.light:hover {
  border-color: #d99a5b;
  color: #f0c89a;
  background: rgba(245, 239, 228, 0.12);
  transform: translateY(-2px);
}

/* ---------- 下滑提示（深色版） ---------- */
.scroll-hint.light {
  position: absolute;
  right: 50%;
  bottom: 46px;
  transform: translateX(calc(580px + 13px));
  display: flex;
  justify-content: center;
  width: 26px;
  height: 42px;
  border: 1.5px solid rgba(245, 239, 228, 0.3);
  border-radius: 999px;
  background: rgba(245, 239, 228, 0.05);
  z-index: 4;
}

.scroll-hint.light .scroll-line {
  width: 3px;
  height: 10px;
  margin-top: 7px;
  border-radius: 2px;
  background: #d99a5b;
  animation: scrollDown 1.8s ease-in-out infinite;
}

@keyframes scrollDown {
  0%   { transform: translateY(0); opacity: 1; }
  70%  { transform: translateY(12px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ============ 通用 Section ============ */
.section { padding: 110px 0; }

.section-alt {
  position: relative;
  background: var(--bg-alt);
}

.section-alt::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(28, 27, 23, 0.05) 1px, transparent 0);
  background-size: 26px 26px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, #000, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, #000, transparent 70%);
  pointer-events: none;
}

.section-alt > .container { position: relative; z-index: 1; }

.section-head {
  max-width: 700px;
  margin: 0 auto 68px;
  text-align: center;
}

.section-kicker {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-kicker::before,
.section-kicker::after {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--accent);
  opacity: 0.45;
}

.section-kicker.light { color: #c58a4e; }

.section-title {
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: 0.5px;
}

.section-title.light { color: #f5efe4; }

/* ============ 卡片网格 ============ */
.card-grid { display: grid; gap: 26px; }

.grid-3 { grid-template-columns: repeat(3, 1fr); }

.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  padding: 38px 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

/* 卡片顶部铜色细线（悬浮展开） */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(160, 95, 44, 0.3);
  box-shadow: var(--shadow-hover);
}

.card:hover::before { transform: scaleX(1); }

.card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid rgba(160, 95, 44, 0.2);
  transition: background 0.3s, color 0.3s;
}

.card:hover .card-index {
  background: var(--ink);
  color: #e9c9a4;
  border-color: var(--ink);
}

.card h3 {
  margin: 20px 0 14px;
  font-size: 21px;
  font-weight: 700;
}

.card > p {
  font-size: 15px;
  color: var(--ink-soft);
}

.card-list {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
  list-style: none;
}

.card-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.card-list li:last-child { margin-bottom: 0; }

.card-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
}

/* ============ 解决方案 ============ */
.solution-card {
  position: relative;
  padding: 32px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.solution-card:hover {
  transform: translateY(-6px);
  border-color: rgba(160, 95, 44, 0.3);
  box-shadow: var(--shadow-hover);
}

.solution-card h3 {
  position: relative;
  font-size: 17.5px;
  font-weight: 700;
  margin-bottom: 10px;
  padding-left: 16px;
}

.solution-card h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  border-radius: 3px;
  background: var(--accent);
}

.solution-card p {
  font-size: 14px;
  color: var(--ink-soft);
}

/* 服务流程 */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 80px;
  padding: 48px 44px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.process-item { position: relative; }

/* 步骤间连接虚线：从上一个圆圈右缘连到当前圆圈左缘 */
.process-item + .process-item::before {
  content: "";
  position: absolute;
  left: calc(34px - 100%);
  top: 23px;
  width: calc(100% - 44px);
  height: 0;
  border-top: 2px dashed rgba(160, 95, 44, 0.35);
}

.process-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  border-radius: 50%;
  font-size: 15px;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1.5px solid rgba(160, 95, 44, 0.35);
}

.process-item h4 { font-size: 17.5px; font-weight: 700; }

.process-item p {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--ink-faint);
}

/* ============ 关于我们 ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text .section-kicker { margin-bottom: 12px; }

.about-text .section-title {
  text-align: left;
  margin-bottom: 28px;
}

.about-text .section-kicker::before { display: none; }
.about-text .section-kicker::after { display: none; }

.about-text p {
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.about-points {
  margin-top: 32px;
  list-style: none;
}

.about-points li {
  position: relative;
  padding: 18px 22px 18px 26px;
  margin-bottom: 14px;
  background: var(--bg-alt);
  border-radius: 10px;
  overflow: hidden;
  font-size: 15px;
  color: var(--ink-soft);
  transition: transform 0.25s, box-shadow 0.25s;
}

.about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent);
}

.about-points li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
}

.about-points strong { color: var(--ink); margin-right: 6px; }

.about-panel {
  position: sticky;
  top: 112px;
  border-radius: var(--radius);
  padding: 46px 38px;
  color: #f5efe4;
  background: var(--bg-dark);
  box-shadow: 0 20px 50px rgba(27, 26, 22, 0.28);
  overflow: hidden;
}

.about-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 239, 228, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 239, 228, 0.035) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}

.about-panel-item { position: relative; }

.about-panel-item + .about-panel-item {
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid rgba(245, 239, 228, 0.14);
}

.about-panel h3 {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 4px;
  color: #c58a4e;
  margin-bottom: 12px;
}

.about-panel h3::before {
  content: "";
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.about-panel p {
  font-size: 15.5px;
  color: rgba(245, 239, 228, 0.82);
  line-height: 1.75;
}

/* ============ 联系我们（深色区） ============ */
.section-dark {
  position: relative;
  overflow: hidden;
  background: var(--bg-dark);
}

.section-dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 239, 228, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 239, 228, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000, transparent 80%);
  pointer-events: none;
}

.contact-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: center;
}

.contact-desc {
  margin-top: 22px;
  max-width: 480px;
  font-size: 15.5px;
  color: rgba(245, 239, 228, 0.6);
}

.contact-card {
  position: relative;
  padding: 48px 38px;
  border-radius: var(--radius);
  text-align: center;
  background: rgba(245, 239, 228, 0.04);
  border: 1px solid rgba(245, 239, 228, 0.14);
}

.contact-label {
  font-size: 13px;
  letter-spacing: 4px;
  color: rgba(245, 239, 228, 0.5);
  margin-bottom: 16px;
}

.contact-mail {
  display: inline-block;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #f5efe4;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 6px;
  transition: color 0.25s, border-color 0.25s, transform 0.25s;
}

.contact-mail:hover {
  color: #e9c9a4;
  border-bottom-color: #c58a4e;
  transform: translateY(-2px);
}

.contact-note {
  margin-top: 20px;
  font-size: 13px;
  color: rgba(245, 239, 228, 0.42);
}

/* 邮箱与企业微信二维码并排 */
.contact-ways {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 56px;
  flex-wrap: wrap;
}

.contact-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.contact-qr img {
  width: 132px;
  height: 132px;
  padding: 8px;
  background: #fff;
  border-radius: 10px;
  object-fit: contain;
}

.contact-qr-label {
  font-size: 13px;
  letter-spacing: 2px;
  color: rgba(245, 239, 228, 0.5);
}

/* ============ 页脚 ============ */
.site-footer {
  background: #141310;
  color: rgba(245, 239, 228, 0.55);
  padding: 60px 0 42px;
}

.footer-inner { text-align: center; }

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-bottom: 30px;
}

.footer-brand p { font-size: 15px; color: rgba(245, 239, 228, 0.85); }

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(245, 239, 228, 0.1);
}

.footer-links a {
  font-size: 14px;
  color: rgba(245, 239, 228, 0.5);
  transition: color 0.2s;
}

.footer-links a:hover { color: #f5efe4; }

/* 版权行与备案号：同一标签同一类，样式完全一致 */
.footer-copy {
  margin-top: 24px;
  font-size: 13px;
  color: rgba(245, 239, 228, 0.32);
}

.footer-icp { margin-top: 10px; }

.footer-icp a {
  color: inherit;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

/* ============ 入场动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.75s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.75s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

/* 同组卡片错峰出现 */
.card-grid .reveal:nth-child(2) { transition-delay: 0.1s; }
.card-grid .reveal:nth-child(3) { transition-delay: 0.2s; }
.card-grid .reveal:nth-child(4) { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .kicker-dot, .scroll-line { animation: none; }
  .hero-slide.active img { animation: none; }
}

/* ============ 响应式 ============ */
@media (max-width: 1240px) {
  .scroll-hint { display: none; }
}

@media (max-width: 1024px) {
  .scroll-hint { display: none; }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
  .process-item + .process-item::before { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-panel { position: static; }
  .contact-inner { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px 5%;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s, opacity 0.25s;
    box-shadow: 0 20px 40px rgba(28, 27, 23, 0.1);
  }

  .main-nav.open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }

  /* 展开后的白色菜单内恢复深色文字 */
  .main-nav.open a,
  .site-header:not(.scrolled) .main-nav.open a { color: var(--ink-soft); }
  .main-nav.open a:hover { color: var(--ink); background: var(--bg-alt); }

  .main-nav a { padding: 14px 12px; border-radius: 8px; }
  .main-nav .nav-cta { margin: 8px 0 4px; text-align: center; }
  .site-header:not(.scrolled) .main-nav.open .nav-cta {
    background: var(--ink);
    border-color: var(--ink);
    color: #f5efe4;
  }

  .hero { min-height: 600px; max-height: none; }
  .hero-content { padding: 96px 0 110px; }
  .hero-copies { min-height: 360px; }

  .section { padding: 76px 0; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .process { grid-template-columns: 1fr; padding: 34px 28px; }
}