/* roulang page: index */
/* ============ 设计变量 ============ */
:root {
  --bg: #0A1710;
  --surface: #10291D;
  --panel: #163524;
  --accent: #D8A44B;
  --accent-hover: #C08A35;
  --accent-light: #E8C47F;
  --glow-green: rgba(96,196,154,0.18);
  --glow-gold: rgba(216,164,75,0.22);
  --text-main: #EFE9DA;
  --text-secondary: #AEB8A6;
  --text-muted: #7F8C7D;
  --border: rgba(239,233,218,0.08);
  --border-accent: rgba(216,164,75,0.35);
  --shadow: 0 12px 30px rgba(0,0,0,0.35);
  --shadow-hover: 0 20px 44px rgba(0,0,0,0.5);
  --radius-card: 18px;
  --radius-btn: 10px;
  --radius-img: 14px;
  --radius-badge: 999px;
  --container: 1200px;
  --gap: 24px;
  --font-main: "PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  --ease: cubic-bezier(0.22,0.61,0.36,1);
}

/* ============ Reset / Base ============ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background-color: var(--bg);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color 0.25s var(--ease); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; }
button { cursor: pointer; background: none; border: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: rgba(216,164,75,0.3); }

.container { max-width: var(--container); margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.section { padding: 96px 0; position: relative; }
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent-light);
  background: rgba(216,164,75,0.1);
  border: 1px solid var(--border-accent);
  padding: 6px 16px; border-radius: var(--radius-badge);
  margin-bottom: 16px;
}
.section-title { font-size: 34px; font-weight: 800; line-height: 1.3; margin-bottom: 14px; }
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 640px; line-height: 1.7; }
.section-head { margin-bottom: 48px; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; font-size: 15px; font-weight: 600;
  border-radius: var(--radius-btn); border: 1px solid transparent;
  transition: all 0.25s var(--ease); cursor: pointer;
  text-align: center; white-space: nowrap; user-select: none;
}
.btn-primary {
  background: var(--accent); color: #0A1710;
  box-shadow: 0 4px 18px rgba(216,164,75,0.25);
}
.btn-primary:hover {
  background: var(--accent-hover); color: #0A1710;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(216,164,75,0.35);
}
.btn-primary:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(216,164,75,0.2); }
.btn-outline {
  background: transparent; color: var(--accent-light);
  border-color: rgba(216,164,75,0.5);
}
.btn-outline:hover {
  background: rgba(216,164,75,0.1);
  border-color: var(--accent);
  color: var(--accent-light);
  transform: translateY(-2px);
}
.btn-outline:active { transform: translateY(0); }
.btn-lg { padding: 14px 38px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn:disabled, .btn.disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ============ Header / Nav ============ */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,23,16,0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center;
  height: 72px; gap: 32px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; font-weight: 800; color: var(--text-main);
  letter-spacing: 0.02em; flex-shrink: 0;
}
.brand:hover .brand-text { color: var(--accent-light); }
.brand-icon {
  width: 34px; height: 34px; flex-shrink: 0;
  color: var(--accent);
}
.brand-text span { color: var(--accent-light); }
.nav-menu {
  display: flex; align-items: center; gap: 28px;
  margin-left: auto;
}
.nav-menu a {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  padding: 8px 2px; position: relative; white-space: nowrap;
  transition: color 0.2s;
}
.nav-menu a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 2px; background: var(--accent);
  transition: width 0.3s var(--ease);
}
.nav-menu a:hover { color: var(--accent-light); }
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }
.nav-menu a.active { color: var(--accent-light); }
.nav-cta { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.nav-toggle {
  display: none; width: 42px; height: 42px; border-radius: 8px;
  align-items: center; justify-content: center;
  color: var(--text-main); font-size: 20px;
  border: 1px solid var(--border); background: rgba(239,233,218,0.04);
  transition: all 0.2s;
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }
.nav-toggle:active { transform: scale(0.95); }

/* ============ Hero ============ */
.hero {
  position: relative; min-height: 720px;
  display: flex; align-items: center;
  padding: 72px 0 80px; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('/assets/images/backpic/back-1.jpg');
  background-size: cover; background-position: center;
}
.hero-bg::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10,23,16,0.92) 0%, rgba(10,23,16,0.78) 55%, rgba(16,41,29,0.55) 100%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 85% 15%, var(--glow-gold) 0%, transparent 50%),
    radial-gradient(circle at 10% 85%, var(--glow-green) 0%, transparent 50%);
  pointer-events: none;
}
.hero-grid {
  position: relative; z-index: 2;
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  grid-template-rows: auto auto auto;
  gap: 24px;
}
.hero-main {
  grid-row: 1 / 3; grid-column: 1;
  background: rgba(16,41,29,0.72);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 48px 44px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; justify-content: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 600; color: var(--accent-light);
  background: rgba(216,164,75,0.12);
  border: 1px solid var(--border-accent);
  padding: 5px 14px; border-radius: var(--radius-badge);
  width: fit-content; margin-bottom: 22px;
}
.hero-badge i { font-size: 12px; }
.hero h1 {
  font-size: 46px; font-weight: 900; line-height: 1.25;
  margin-bottom: 18px; letter-spacing: 0.01em;
}
.hero h1 .highlight { color: var(--accent-light); }
.hero-sub {
  font-size: 16px; line-height: 1.8; color: var(--text-secondary);
  max-width: 520px; margin-bottom: 32px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-metrics {
  display: flex; gap: 20px; margin-top: 36px;
  padding-top: 24px; border-top: 1px solid var(--border);
}
.hero-metrics span {
  font-size: 13px; color: var(--text-muted);
}
.hero-metrics strong { color: var(--accent-light); font-weight: 700; font-size: 15px; margin-right: 4px; }
.hero-card {
  background: rgba(16,41,29,0.72);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden; position: relative;
  backdrop-filter: blur(10px);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.hero-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--border-accent); }
.hero-card-hot { grid-row: 1; grid-column: 2; }
.hero-card-hot .card-img {
  position: relative; aspect-ratio: 16 / 9; overflow: hidden;
}
.hero-card-hot .card-img img { width: 100%; height: 100%; object-fit: cover; object-position: center; transition: transform 0.5s ease; }
.hero-card-hot:hover .card-img img { transform: scale(1.04); }
.hero-card-hot .badge-gold {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  background: var(--accent); color: #0A1710;
  font-size: 12px; font-weight: 700;
  padding: 4px 12px; border-radius: var(--radius-badge);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.hero-card .hot-content { padding: 16px 16px 18px; }
.hero-card .hot-content a {
  display: block; font-size: 14px; font-weight: 600; line-height: 1.5;
  color: var(--text-main); margin-bottom: 6px;
}
.hero-card .hot-content a:hover { color: var(--accent-light); }
.hero-card .hot-meta { font-size: 12px; color: var(--text-muted); display: flex; align-items: center; gap: 6px; }
.hero-card .hot-meta i { font-size: 11px; }
.hero-card-stats {
  grid-row: 2; grid-column: 2;
  padding: 24px 22px;
}
.hero-card-stats .label { font-size: 12px; color: var(--text-muted); display: block; margin-bottom: 6px; }
.hero-card-stats .num { font-size: 34px; font-weight: 800; color: var(--accent-light); font-feature-settings: "tnum"; line-height: 1.2; }
.hero-card-stats .desc { font-size: 13px; color: var(--text-secondary); margin-top: 8px; line-height: 1.6; }
.hero-cta-bar {
  grid-row: 3; grid-column: 1 / 3;
  background: rgba(11,24,17,0.75);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-card);
  padding: 22px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}
.hero-cta-bar .text { font-size: 15px; font-weight: 600; color: var(--text-main); }
.hero-cta-bar .text i { color: var(--accent); margin-right: 8px; }

/* ============ 服务区 ============ */
.services { background: var(--bg); }
.tag-strip {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 32px; padding-bottom: 8px;
}
.tag-strip .tag {
  padding: 9px 20px; font-size: 14px; font-weight: 500;
  border-radius: var(--radius-badge);
  background: rgba(239,233,218,0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer;
  transition: all 0.25s var(--ease); white-space: nowrap;
}
.tag-strip .tag:hover {
  border-color: var(--border-accent); color: var(--accent-light);
  background: rgba(216,164,75,0.08);
}
/* 不等宽两列 */
.services-wrap {
  display: grid; grid-template-columns: 7fr 5fr; gap: 24px;
}
.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 30px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.service-card:hover { border-color: var(--border-accent); box-shadow: var(--shadow-hover); }
.service-card .card-title { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.service-card .card-sub { font-size: 14px; color: var(--text-muted); margin-bottom: 22px; }
.svc-list li {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 0; border-bottom: 1px solid rgba(239,233,218,0.06);
}
.svc-list li:last-child { border-bottom: none; }
.svc-icon {
  width: 40px; height: 40px; flex-shrink: 0;
  background: rgba(216,164,75,0.1);
  border: 1px solid rgba(216,164,75,0.18);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); font-size: 17px;
}
.svc-list .svc-title { font-size: 15px; font-weight: 600; margin-bottom: 3px; }
.svc-list .svc-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.service-card .btn { margin-top: 20px; }

/* ============ 统计 ============ */
.stats {
  border-top: 1px solid transparent;
  border-image: linear-gradient(90deg, transparent, var(--accent), transparent) 1;
  background: var(--bg);
}
.stats-grid {
  display: flex; justify-content: space-between; gap: 24px;
  padding: 24px 0;
}
.stat-item {
  flex: 1; text-align: center;
  padding: 40px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.stat-item:hover { border-color: var(--border-accent); box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.stat-num {
  font-size: 46px; font-weight: 800; color: var(--accent);
  font-feature-settings: "tnum"; line-height: 1.1; margin-bottom: 8px;
}
.stat-label { font-size: 14px; color: var(--text-secondary); }

/* ============ 案例区 ============ */
.cases { background: var(--bg); }
.case-row-1 {
  display: flex; gap: 24px; margin-bottom: 24px;
}
.case-card-main { flex: 2; }
.case-card-side { flex: 1; }
.case-row-2 {
  display: flex; gap: 24px;
}
.case-card-b { flex: 1; }
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  height: 100%; display: flex; flex-direction: column;
}
.case-card:hover { border-color: var(--border-accent); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.case-img {
  position: relative; overflow: hidden; background: var(--panel);
}
.case-card-main .case-img { aspect-ratio: 16 / 10; }
.case-card-side .case-img { aspect-ratio: 4 / 3; }
.case-card-b .case-img { aspect-ratio: 16 / 9; }
.case-img img {
  width: 100%; height: 100%; object-fit: cover; object-position: center;
  transition: transform 0.5s ease;
}
.case-card:hover .case-img img { transform: scale(1.03); }
.case-badge {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  background: rgba(10,23,16,0.8); color: var(--accent-light);
  border: 1px solid var(--border-accent);
  font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: var(--radius-badge);
  backdrop-filter: blur(4px);
}
.case-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex: 1; }
.case-title { font-size: 18px; font-weight: 700; line-height: 1.4; margin-bottom: 10px; }
.case-card-main .case-title { font-size: 21px; }
.case-excerpt {
  font-size: 14px; color: var(--text-secondary); line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; margin-bottom: 16px;
}
.case-meta {
  display: flex; align-items: center; gap: 16px;
  font-size: 13px; color: var(--text-muted);
  margin-top: auto; padding-top: 14px; border-top: 1px solid rgba(239,233,218,0.06);
}
.case-meta .author { display: flex; align-items: center; gap: 6px; }
.case-meta .author i { color: var(--accent); }
.case-meta .views, .case-meta .likes { display: flex; align-items: center; gap: 5px; }
.case-meta .views i { font-size: 12px; }

/* ============ 方案区 ============ */
.steps {
  background: var(--surface);
  position: relative;
  overflow: hidden;
}
.steps::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(239,233,218,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(239,233,218,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.steps-inner { position: relative; z-index: 2; }
.step-list { position: relative; padding-left: 0; }
.step-list::before {
  content: "";
  position: absolute; left: 42px; top: 20px; bottom: 40px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, rgba(216,164,75,0.1) 100%);
}
.step-item {
  display: flex; align-items: flex-start; gap: 28px;
  padding: 34px 0; position: relative;
}
.step-num {
  width: 84px; flex-shrink: 0; text-align: right;
  font-size: 52px; font-weight: 800; line-height: 1;
  color: var(--accent); font-feature-settings: "tnum";
  opacity: 0.9; position: relative; z-index: 2;
}
.step-content {
  max-width: 560px; padding: 4px 0 0;
  border-left: 1px solid var(--border);
  padding-left: 28px;
}
.step-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 14px; }
.step-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; color: var(--accent-light);
  padding: 6px 0; border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.step-link:hover { color: var(--accent); border-bottom-color: var(--accent); }
.step-link i { font-size: 12px; }

/* ============ FAQ ============ */
.faq { background: var(--bg); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid rgba(239,233,218,0.1);
  transition: background 0.3s;
}
.faq-item:first-child { border-top: 1px solid rgba(239,233,218,0.1); }
.faq-item.open {
  background: rgba(216,164,75,0.05);
  border-left: 3px solid var(--accent);
}
.faq-q {
  display: flex; justify-content: space-between; align-items: center;
  width: 100%; padding: 20px 20px; cursor: pointer;
  font-size: 16px; font-weight: 600; color: var(--text-main);
  text-align: left; transition: color 0.2s;
}
.faq-q:hover { color: var(--accent-light); }
.faq-arrow {
  width: 22px; height: 22px; flex-shrink: 0;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
  margin-left: 16px;
}
.faq-item.open .faq-arrow { transform: rotate(225deg); }
.faq-a {
  max-height: 0; overflow: hidden; padding: 0 20px;
  transition: max-height 0.35s var(--ease), padding 0.35s var(--ease);
  font-size: 15px; color: var(--text-secondary); line-height: 1.75;
}
.faq-item.open .faq-a {
  max-height: 300px; padding: 0 20px 24px;
}

/* ============ CTA + 联系 ============ */
.contact-zone { background: var(--bg); }
.cta-banner {
  position: relative; overflow: hidden;
  border-radius: 22px;
  padding: 64px 56px;
  margin-bottom: 80px;
  background-image: url('/assets/images/backpic/back-2.jpg');
  background-size: cover; background-position: center;
  border: 1px solid var(--border-accent);
}
.cta-banner::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(10,23,16,0.9) 0%, rgba(10,23,16,0.75) 60%, rgba(16,41,29,0.65) 100%);
}
.cta-banner .inner { position: relative; z-index: 2; text-align: center; }
.cta-title { font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.cta-sub { font-size: 16px; color: var(--text-secondary); margin-bottom: 28px; max-width: 520px; margin-left: auto; margin-right: auto; }
.contact-wrap {
  display: grid; grid-template-columns: 5fr 7fr; gap: 48px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 48px;
}
.contact-info h3 { font-size: 24px; font-weight: 700; margin-bottom: 12px; }
.contact-info .sub { font-size: 14px; color: var(--text-muted); margin-bottom: 32px; }
.contact-item {
  display: flex; align-items: flex-start; gap: 14px;
  margin-bottom: 24px;
}
.contact-item .ic {
  width: 42px; height: 42px; flex-shrink: 0;
  background: rgba(216,164,75,0.1);
  border: 1px solid rgba(216,164,75,0.18);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); font-size: 16px;
}
.contact-item .label { font-size: 12px; color: var(--text-muted); display: block; margin-bottom: 2px; }
.contact-item .value { font-size: 15px; color: var(--text-main); font-weight: 500; }
.contact-form h3 { font-size: 22px; font-weight: 700; margin-bottom: 24px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.form-group input,
.form-group select,
.form-group textarea {
  background: #0C1A13;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  padding: 12px 14px;
  font-size: 15px; color: var(--text-main);
  transition: border-color 0.25s, box-shadow 0.25s;
  width: 100%;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(216,164,75,0.15);
  outline: none;
}
.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23D8A44B' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center;
}
.form-group option { background: #10291D; color: var(--text-main); }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-submit { margin-top: 24px; }

/* ============ Footer ============ */
.footer {
  background: var(--bg);
  border-top: 1px solid transparent;
  border-image: linear-gradient(90deg, transparent, rgba(216,164,75,0.5), transparent) 1;
  padding: 64px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 48px;
  padding-bottom: 40px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .icon { color: var(--accent); font-size: 24px; }
.footer-brand .name { font-size: 18px; font-weight: 800; }
.footer-about p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; max-width: 320px; }
.footer-col h4 { font-size: 15px; font-weight: 700; margin-bottom: 18px; color: var(--text-main); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 14px; color: var(--text-secondary);
  transition: color 0.2s, padding-left 0.2s;
}
.footer-col ul a:hover { color: var(--accent-light); padding-left: 4px; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; }
.footer-contact li i { color: var(--accent); margin-top: 4px; font-size: 13px; }
.footer-bottom {
  border-top: 1px solid rgba(239,233,218,0.06);
  padding: 20px 0;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  flex-wrap: wrap;
  font-size: 13px; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--accent-light); }

/* ============ 背景装饰 ============ */
.bg-decoration { pointer-events: none; position: absolute; inset: 0; z-index: 0; }
.bg-glow { position: absolute; border-radius: 50%; filter: blur(80px); }

/* ============ 响应式 ============ */
@media (max-width: 1199px) {
  .hero h1 { font-size: 40px; }
  .hero-grid { grid-template-columns: 1.2fr 0.8fr; }
}
@media (max-width: 991px) {
  .section { padding: 64px 0; }
  .nav-menu, .nav-cta {
    display: none;
    position: absolute; top: 72px; left: 24px; right: 24px;
    background: rgba(10,23,16,0.96);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 24px; flex-direction: column; gap: 16px;
  }
  .nav-menu.open { display: flex; }
  .nav-cta { position: static; display: none; }
  .nav-cta.open { display: flex; flex-direction: column; margin-top: 12px; padding-top: 16px; border-top: 1px solid var(--border); }
  .nav-cta.open .btn { width: 100%; }
  .nav-menu a { font-size: 16px; }
  .nav-toggle { display: flex; }
  .nav-inner { position: relative; }
  .nav-menu { margin-top: 8px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-main { grid-row: auto; grid-column: 1; }
  .hero-card-hot { grid-row: auto; grid-column: 1; }
  .hero-card-stats { grid-row: auto; grid-column: 1; }
  .hero-cta-bar { grid-column: 1; flex-direction: column; text-align: center; }
  .hero { min-height: auto; padding: 48px 0; }
  .services-wrap { grid-template-columns: 1fr; }
  .case-row-1 { flex-direction: column; }
  .case-row-2 { flex-direction: column; }
  .contact-wrap { grid-template-columns: 1fr; padding: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { flex-wrap: wrap; }
  .stat-item { min-width: calc(50% - 12px); }
  .step-item { gap: 16px; }
  .step-num { font-size: 42px; width: 60px; }
  .step-content { padding-left: 16px; }
}
@media (max-width: 767px) {
  .section { padding: 56px 0; }
  .section-title { font-size: 28px; }
  .hero-main { padding: 32px 24px; }
  .hero h1 { font-size: 34px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
  .hero-metrics { flex-wrap: wrap; gap: 12px; }
  .hero-cta-bar { padding: 18px 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-group.full { grid-column: 1; }
  .cta-banner { padding: 40px 24px; }
  .cta-title { font-size: 26px; }
  .contact-wrap { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .stats-grid { gap: 12px; }
  .stat-item { min-width: calc(50% - 6px); padding: 24px 12px; }
  .stat-num { font-size: 36px; }
  .step-list::before { left: 26px; }
  .step-num { font-size: 34px; width: 44px; }
  .step-content { padding-left: 12px; }
  .step-title { font-size: 18px; }
}

@media (max-width: 520px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .brand { font-size: 17px; }
  .brand-icon { width: 28px; height: 28px; }
  .hero h1 { font-size: 30px; }
  .hero-badge { font-size: 12px; }
  .btn-lg { padding: 12px 28px; }
  .case-body { padding: 16px 16px 20px; }
  .case-title { font-size: 16px; }
  .stat-item { padding: 18px 8px; }
  .stat-num { font-size: 30px; }
  .stat-label { font-size: 12px; }
  .step-item { flex-direction: column; }
  .step-num { text-align: left; width: auto; }
  .step-list::before { display: none; }
  .step-content { border-left: none; padding-left: 0; }
  .footer-bottom { flex-direction: column; text-align: center; }
}