/* roulang page: index */
:root {
    --primary: #3A6B9E;
    --primary-dark: #2D547D;
    --primary-light: #EDF3F8;
    --accent: #B9794E;
    --accent-dark: #9E6240;
    --accent-light: #FAF3EC;
    --gold: #E4C58D;
    --bg: #F7FAFC;
    --card-bg: #FFFFFF;
    --text-heading: #1F2B38;
    --text-body: #3D4C5C;
    --text-muted: #6B7A8A;
    --border: #E1E9F0;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 8px rgba(45, 70, 100, 0.05);
    --shadow-hover: 0 8px 24px rgba(45, 70, 100, 0.08);
    --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    --container: 1200px;
    --space-section: 96px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); font-size: 16px; line-height: 1.7; color: var(--text-body); background: var(--bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .25s; }
a:hover { color: var(--primary-dark); }
ul, ol { list-style: none; }
button { font-family: var(--font); cursor: pointer; }
input, textarea, select { font-family: var(--font); font-size: 15px; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space-section) 0; }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-num { display: inline-block; font-size: 14px; font-weight: 700; color: var(--primary); letter-spacing: .08em; margin-bottom: 10px; border: 1px solid var(--border); border-radius: 999px; padding: 4px 16px; background: #fff; }
.section-head h2 { font-size: 30px; font-weight: 800; color: var(--text-heading); line-height: 1.3; margin-bottom: 10px; }
.section-head p { font-size: 16px; color: var(--text-muted); line-height: 1.7; max-width: 640px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; padding: 12px 28px; border: 2px solid transparent; transition: all .25s ease; text-align: center; line-height: 1.4; }
.btn:focus { outline: none; box-shadow: 0 0 0 3px rgba(58, 107, 158, .2); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(185, 121, 78, .25); }
.btn-primary:active { transform: translateY(0); box-shadow: none; }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary-dark); }
.btn-outline:active { background: var(--primary-light); transform: translateY(0); }
.btn-copy { background: var(--primary-light); color: var(--primary); border: 1px solid var(--border); font-size: 14px; padding: 10px 20px; border-radius: 8px; transition: all .25s; }
.btn-copy:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-copy:active { transform: translateY(1px); }
.btn-block { width: 100%; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255, 255, 255, .92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); transition: box-shadow .3s; }
.site-header.scrolled { box-shadow: 0 1px 4px rgba(45, 70, 100, .08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding-top: 14px; padding-bottom: 14px; gap: 16px; }
.site-brand a { font-size: 28px; font-weight: 800; color: var(--text-heading); line-height: 1.2; letter-spacing: .01em; text-decoration: none; display: block; }
.site-brand a:hover { color: var(--primary); }
.site-nav ul { display: flex; gap: 4px; align-items: center; }
.site-nav ul li a { display: inline-block; padding: 8px 14px; font-size: 15px; color: var(--text-body); border-radius: 8px; font-weight: 500; transition: all .2s; }
.site-nav ul li a:hover { color: var(--primary); background: var(--primary-light); }
.site-nav ul li a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
.nav-sep { width: 1px; height: 20px; background: var(--border); margin: 0 8px; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; padding: 8px; border-radius: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--text-heading); border-radius: 2px; transition: all .3s; }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Hero */
.hero { position: relative; padding: 80px 0 0; background: var(--bg); overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background-image: url('/assets/images/backpic/back-1.jpg'); background-size: cover; background-position: center; opacity: .18; z-index: 0; }
.hero-bg::after { content: ''; position: absolute; inset: 0; background: linear-gradient(120deg, rgba(247, 250, 252, .96) 0%, rgba(247, 250, 252, .88) 45%, rgba(247, 250, 252, .65) 100%); }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; padding-bottom: 64px; }
.hero-content h1 { font-size: 40px; font-weight: 800; line-height: 1.25; color: var(--text-heading); letter-spacing: -.01em; margin-bottom: 20px; }
.hero-content h1 .highlight { color: var(--primary); }
.hero-sub { font-size: 17px; color: var(--text-body); line-height: 1.75; margin-bottom: 28px; max-width: 540px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-trust { display: flex; gap: 10px; flex-wrap: wrap; }
.trust-badge { display: inline-flex; align-items: center; gap: 6px; background: #fff; border: 1px solid var(--border); border-radius: 999px; padding: 6px 16px; font-size: 13px; font-weight: 500; color: var(--text-body); box-shadow: var(--shadow); }
.trust-badge::before { content: '✓'; color: var(--primary); font-weight: 700; }

/* Hero WeChat Card */
.hero-card { position: relative; z-index: 1; }
.wechat-card { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 32px; box-shadow: var(--shadow-hover); max-width: 380px; margin-left: auto; text-align: center; }
.wechat-card h3 { font-size: 20px; font-weight: 700; color: var(--text-heading); margin-bottom: 6px; }
.wechat-card .sub { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.qr-placeholder { width: 180px; height: 180px; background: linear-gradient(135deg, var(--primary-light), #fff); border: 1px solid var(--border); border-radius: 12px; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; font-size: 13px; color: var(--text-muted); position: relative; }
.qr-placeholder::after { content: '二维码占位'; position: absolute; bottom: 10px; left: 0; right: 0; text-align: center; font-size: 12px; color: var(--text-muted); }
.wechat-id { font-size: 18px; font-weight: 700; color: var(--text-heading); margin-bottom: 16px; letter-spacing: .02em; }
.wechat-id span { color: var(--primary); }
.wechat-card .btn-copy { width: 100%; margin-bottom: 12px; }
.wechat-hint { font-size: 12px; color: var(--text-muted); line-height: 1.6; }

/* Hero Index Strip */
.hero-index { position: relative; z-index: 1; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: rgba(255, 255, 255, .8); backdrop-filter: blur(4px); }
.index-inner { display: flex; justify-content: center; gap: 36px; flex-wrap: wrap; padding: 16px 0; }
.index-inner a { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 500; color: var(--text-muted); letter-spacing: .05em; text-decoration: none; transition: color .2s; }
.index-inner a span { color: var(--primary); font-weight: 800; }
.index-inner a:hover { color: var(--primary); }

/* Service Cards */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; box-shadow: var(--shadow); transition: all .3s; position: relative; overflow: hidden; }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--primary); opacity: 0; transition: opacity .3s; }
.service-card:hover { border-color: rgba(58, 107, 158, .3); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.service-card:hover::before { opacity: 1; }
.service-icon { width: 48px; height: 48px; background: var(--primary-light); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 22px; font-weight: 800; color: var(--primary); margin-bottom: 18px; }
.service-card h3 { font-size: 18px; font-weight: 700; color: var(--text-heading); margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin-bottom: 14px; }
.service-card .scene { font-size: 13px; color: var(--accent); font-weight: 500; margin-bottom: 14px; }
.service-card .card-link { font-size: 14px; font-weight: 600; color: var(--primary); text-decoration: none; display: inline-flex; align-items: center; gap: 4px; transition: gap .2s; }
.service-card .card-link:hover { gap: 8px; color: var(--primary-dark); }

/* Data Section */
.data-section { background: var(--primary-light); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.data-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 24px; text-align: center; transition: box-shadow .3s; }
.data-item:hover { box-shadow: var(--shadow-hover); }
.data-item .number { display: block; font-size: 42px; font-weight: 800; color: var(--primary); line-height: 1.2; margin-bottom: 8px; font-feature-settings: "tnum"; }
.data-item .data-label { font-size: 14px; color: var(--text-muted); font-weight: 500; }
.data-item .data-note { font-size: 12px; color: #9AA8B5; margin-top: 6px; }

/* Case Cards */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: all .3s; }
.case-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.case-cover { width: 100%; height: 200px; object-fit: cover; background: var(--primary-light); }
.case-cover-placeholder { width: 100%; height: 200px; background: linear-gradient(135deg, var(--primary-light), #F0F5FA); display: flex; align-items: center; justify-content: center; font-size: 14px; color: var(--text-muted); }
.case-body { padding: 22px 24px 24px; }
.case-body h3 { font-size: 17px; font-weight: 700; color: var(--text-heading); margin-bottom: 8px; }
.case-body p { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin-bottom: 14px; }
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.case-tag { display: inline-block; background: var(--primary-light); color: var(--primary); font-size: 12px; font-weight: 500; border-radius: 999px; padding: 4px 12px; }
.case-meta { font-size: 12px; color: #9AA8B5; border-top: 1px solid var(--border); padding-top: 10px; }
.case-more { display: block; text-align: center; margin-top: 36px; font-size: 15px; font-weight: 600; color: var(--primary); text-decoration: none; }
.case-more:hover { color: var(--primary-dark); text-decoration: underline; }

/* Plan Section */
.plan-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 56px; }
.plan-step { text-align: center; padding: 24px 16px; position: relative; }
.plan-step::after { content: '→'; position: absolute; top: 32px; right: -18px; font-size: 22px; color: var(--border); font-weight: 300; }
.plan-step:last-child::after { display: none; }
.plan-step .step-num { display: inline-flex; align-items: center; justify-content: center; width: 52px; height: 52px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 20px; font-weight: 800; margin-bottom: 14px; }
.plan-step:nth-child(2) .step-num { background: #4A7CA5; }
.plan-step:nth-child(3) .step-num { background: #5B8DB8; }
.plan-step:nth-child(4) .step-num { background: var(--accent); }
.plan-step h4 { font-size: 16px; font-weight: 700; color: var(--text-heading); margin-bottom: 6px; }
.plan-step p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

.plan-table-wrapper { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.plan-table { width: 100%; border-collapse: collapse; min-width: 720px; font-size: 14px; }
.plan-table thead th { background: var(--primary-light); color: var(--text-heading); font-weight: 700; text-align: left; padding: 16px 20px; border-bottom: 2px solid var(--border); font-size: 14px; }
.plan-table tbody td { padding: 16px 20px; border-bottom: 1px solid var(--border); color: var(--text-body); vertical-align: top; }
.plan-table tbody tr:last-child td { border-bottom: none; }
.plan-table tbody tr:hover td { background: rgba(58, 107, 158, .03); }
.plan-table .plan-name { font-weight: 700; color: var(--text-heading); font-size: 15px; }
.plan-table .plan-badge { display: inline-block; background: var(--accent); color: #fff; font-size: 11px; border-radius: 999px; padding: 2px 10px; margin-left: 6px; font-weight: 600; }

/* FAQ Section */
.faq-section { background: var(--bg); }
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; box-shadow: var(--shadow); overflow: hidden; transition: border-color .3s; }
.faq-item[open] { border-color: var(--primary); }
.faq-item summary { padding: 20px 24px; cursor: pointer; list-style: none; font-size: 16px; font-weight: 600; color: var(--text-heading); display: flex; justify-content: space-between; align-items: center; transition: background .25s; min-height: 48px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--primary-light); }
.faq-item summary .arrow { display: inline-block; width: 32px; height: 32px; background: var(--primary-light); border-radius: 50%; text-align: center; line-height: 32px; font-weight: 700; color: var(--primary); flex-shrink: 0; transition: transform .3s, background .3s; }
.faq-item[open] summary .arrow { transform: rotate(180deg); background: var(--primary); color: #fff; }
.faq-answer { padding: 0 24px 24px; border-left: 3px solid var(--primary); margin: 0 24px 20px; background: var(--bg); border-radius: 4px; padding: 16px 20px; font-size: 15px; color: var(--text-body); line-height: 1.7; }

/* Contact / CTA */
.contact-section { background: linear-gradient(135deg, #FAF3EC 0%, #FDF8F3 50%, var(--accent-light) 100%); border-top: 1px solid var(--border); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.contact-left h2 { font-size: 32px; font-weight: 800; color: var(--text-heading); line-height: 1.3; margin-bottom: 16px; }
.contact-left p { font-size: 16px; color: var(--text-body); line-height: 1.75; margin-bottom: 32px; }
.contact-methods { display: flex; flex-direction: column; gap: 18px; margin-bottom: 32px; }
.contact-method { display: flex; align-items: center; gap: 14px; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; box-shadow: var(--shadow); }
.contact-method .icon { width: 44px; height: 44px; background: var(--primary-light); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; }
.contact-method .text strong { display: block; font-size: 15px; color: var(--text-heading); }
.contact-method .text span { font-size: 13px; color: var(--text-muted); }
.contact-card { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 32px; box-shadow: var(--shadow-hover); }
.contact-card h3 { font-size: 20px; font-weight: 700; color: var(--text-heading); margin-bottom: 6px; }
.contact-card .sub { font-size: 14px; color: var(--text-muted); margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--text-heading); margin-bottom: 6px; }
.form-group label .req { color: var(--accent); margin-left: 2px; }
.form-group input, .form-group textarea { width: 100%; height: 44px; border: 1px solid #D5E0EA; border-radius: var(--radius-sm); padding: 0 14px; background: #fff; font-size: 15px; color: var(--text-body); transition: all .2s; }
.form-group textarea { height: auto; min-height: 84px; padding: 12px 14px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(58, 107, 158, .15); outline: none; }
.form-group input::placeholder, .form-group textarea::placeholder { color: #A5B3C2; }

/* Footer */
.site-footer { background: #243447; color: #B8C4CF; }
.footer-top { padding: 56px 0 36px; display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 48px; }
.footer-brand .logo { font-size: 24px; font-weight: 800; color: #fff; display: block; margin-bottom: 12px; line-height: 1.3; }
.footer-brand p { font-size: 14px; line-height: 1.7; color: #8FA0AF; }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 14px; color: #B8C4CF; transition: color .2s; }
.footer-col ul li a:hover { color: var(--gold); }
.footer-contact p { font-size: 14px; line-height: 1.8; color: #B8C4CF; }
.footer-contact .wechat { font-size: 18px; font-weight: 700; color: var(--gold); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding: 22px 0; font-size: 13px; color: #7A8FA0; text-align: center; }
.footer-bottom a { color: #7A8FA0; }
.footer-bottom a:hover { color: var(--gold); }

/* Responsive */
@media (max-width: 1200px) {
    .service-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .data-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
}
@media (max-width: 992px) {
    :root { --space-section: 72px; }
    .hero-inner { grid-template-columns: 1fr; gap: 40px; padding-bottom: 40px; }
    .wechat-card { margin: 0 auto; max-width: 420px; }
    .plan-steps { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .plan-step::after { display: none; }
    .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .site-nav { display: none; }
    .menu-toggle { display: flex; }
    .site-nav.open { display: block; position: absolute; top: 100%; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 16px 24px; box-shadow: 0 8px 24px rgba(45, 70, 100, .08); }
    .site-nav.open ul { flex-direction: column; gap: 0; }
    .site-nav.open ul li a { display: block; padding: 12px 16px; border-radius: 8px; font-size: 16px; }
}
@media (max-width: 768px) {
    .case-grid { grid-template-columns: 1fr; gap: 20px; }
    .service-grid { grid-template-columns: 1fr; }
    .data-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
    .index-inner { gap: 16px; }
    .hero-content h1 { font-size: 32px; }
}
@media (max-width: 576px) {
    :root { --space-section: 56px; }
    body { font-size: 15px; }
    .container { padding: 0 16px; }
    .data-grid { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 28px; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; }
    .plan-steps { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 32px; }
    .section-head h2 { font-size: 26px; }
    .contact-card { padding: 24px 20px; }
    .case-card { max-width: 100%; }
    .wechat-card { padding: 24px 20px; }
    .form-group input { height: 42px; }
}

/* roulang page: index */
/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif; background: #F7FAFC; color: #3D4C5C; font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: #3A6B9E; text-decoration: none; transition: color .25s ease, border-color .25s ease, background .25s ease, box-shadow .25s ease; }
a:hover { color: #2E5780; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: 15px; color: #3D4C5C; }

/* ===== Design Variables ===== */
:root {
  --color-primary: #3A6B9E;
  --color-primary-dark: #2E5780;
  --color-primary-light: #6B95C0;
  --color-primary-soft: #EDF3F8;
  --color-accent: #C98A5F;
  --color-accent-dark: #B9794E;
  --color-accent-soft: #FBF3EC;
  --color-gold: #E4C58D;
  --color-bg: #F7FAFC;
  --color-bg-light: #EDF3F8;
  --color-card: #FFFFFF;
  --color-heading: #1F2B38;
  --color-text: #3D4C5C;
  --color-muted: #6B7A8A;
  --color-border: #E1E9F0;
  --color-footer-bg: #1F2B38;
  --color-footer-text: #B8C6D4;
  --color-footer-heading: #F0F4F8;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(45, 70, 100, 0.05);
  --shadow-md: 0 8px 24px rgba(45, 70, 100, 0.08);
  --shadow-lg: 0 16px 40px rgba(45, 70, 100, 0.12);
  --container-width: 1200px;
  --space-section: 96px;
  --space-section-md: 72px;
  --space-section-sm: 56px;
  --transition: .25s ease;
}

/* ===== Container & Sections ===== */
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space-section) 0; }
.section-alt { background: var(--color-bg-light); }
.section-head { text-align: center; margin-bottom: 48px; }
.section-num { display: inline-block; font-size: 17px; font-weight: 700; color: var(--color-primary); letter-spacing: 3px; margin-bottom: 8px; }
.section-head h2 { font-size: 30px; font-weight: 700; color: var(--color-heading); line-height: 1.3; margin-bottom: 10px; letter-spacing: 1px; }
.section-desc { max-width: 640px; margin: 0 auto; font-size: 16px; color: var(--color-muted); line-height: 1.8; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 26px; border-radius: var(--radius-btn); font-size: 16px; font-weight: 600; line-height: 1.4; text-decoration: none; border: 2px solid transparent; min-height: 46px; transition: all var(--transition); cursor: pointer; white-space: nowrap; }
.btn:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.btn-accent { background: var(--color-accent); color: #fff; box-shadow: 0 2px 8px rgba(201, 138, 95, 0.2); }
.btn-accent:hover { background: var(--color-accent-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 6px 16px rgba(201, 138, 95, 0.3); }
.btn-accent:active { transform: translateY(1px); box-shadow: none; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(58, 107, 158, 0.3); }
.btn-primary:active { transform: translateY(1px); box-shadow: none; }
.btn-outline { background: transparent; border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-outline:hover { background: var(--color-bg-light); border-color: var(--color-primary-dark); color: var(--color-primary-dark); }
.btn-outline:active { transform: translateY(1px); }
.btn-block { width: 100%; }
.btn-sm { padding: 8px 18px; font-size: 14px; min-height: 36px; }

/* ===== Header / Nav ===== */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.94); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--color-border); transition: box-shadow var(--transition); }
.site-header.scrolled { box-shadow: 0 1px 4px rgba(45, 70, 100, 0.08); }
.header-top { text-align: center; padding: 16px 0 10px; }
.brand { font-size: 32px; font-weight: 800; color: var(--color-heading); letter-spacing: 1.5px; line-height: 1.3; text-decoration: none; display: inline-block; }
.brand:hover { color: var(--color-heading); }
.brand small { display: block; font-size: 12px; font-weight: 400; color: var(--color-muted); letter-spacing: 3px; margin-top: 2px; }
.main-nav { border-top: 1px solid var(--color-border); }
.nav-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 0; }
.nav-links a { display: block; padding: 10px 22px; font-size: 15px; font-weight: 500; color: var(--color-text); text-decoration: none; border-right: 1px solid var(--color-border); transition: all var(--transition); position: relative; }
.nav-links li:last-child a, .nav-links a:last-child { border-right: none; }
.nav-links a:hover { color: var(--color-primary); background: var(--color-bg-light); }
.nav-links a.active { color: var(--color-primary); background: var(--color-primary-soft); font-weight: 600; }
.menu-toggle { display: none; background: none; border: none; padding: 10px 14px; font-size: 18px; color: var(--color-heading); border-radius: var(--radius-btn); }

/* ===== Hero ===== */
.hero { position: relative; background: linear-gradient(100deg, rgba(255, 255, 255, 0.97) 0%, rgba(247, 250, 252, 0.92) 32%, rgba(58, 107, 158, 0.15) 100%), url('/assets/images/backpic/back-1.jpg') center / cover no-repeat; border-bottom: 1px solid var(--color-border); padding-top: 64px; }
.hero-inner { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; padding-bottom: 64px; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--color-accent-soft); color: var(--color-accent-dark); border: 1px solid rgba(201, 138, 95, 0.25); border-radius: var(--radius-pill); padding: 6px 16px; font-size: 13px; font-weight: 600; margin-bottom: 18px; }
.hero-badge::before { content: "●"; font-size: 8px; color: var(--color-accent); }
.hero h1 { font-size: 38px; line-height: 1.3; font-weight: 800; color: var(--color-heading); letter-spacing: 0.5px; margin-bottom: 18px; }
.hero-sub { font-size: 17px; line-height: 1.8; color: var(--color-text); max-width: 520px; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 24px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.hero-trust span { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; color: var(--color-muted); background: rgba(255, 255, 255, 0.8); border: 1px solid var(--color-border); border-radius: var(--radius-pill); padding: 4px 12px; }
.hero-trust span::before { content: "✓"; color: var(--color-primary); font-weight: 700; }

/* Hero WeChat Card */
.hero-card-wrap { position: relative; }
.wechat-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: 16px; box-shadow: var(--shadow-lg); padding: 30px 28px; text-align: center; max-width: 350px; margin-left: auto; position: relative; }
.wechat-card::before { content: ""; position: absolute; top: 0; left: 24px; right: 24px; height: 3px; background: linear-gradient(90deg, var(--color-accent), var(--color-gold), var(--color-accent)); border-radius: 0 0 4px 4px; }
.wechat-card-header { font-size: 17px; font-weight: 700; color: var(--color-heading); letter-spacing: 1px; margin-bottom: 4px; }
.wechat-card-sub { font-size: 13px; color: var(--color-muted); margin-bottom: 16px; }
.qr-placeholder { width: 150px; height: 150px; margin: 0 auto 18px; background: var(--color-bg-light); border: 1px dashed var(--color-primary-light); border-radius: var(--radius-card); display: flex; align-items: center; justify-content: center; color: var(--color-primary); font-size: 13px; letter-spacing: 1px; }
.wechat-id { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 14px 16px; margin-bottom: 12px; }
.wechat-id .label { display: block; font-size: 12px; color: var(--color-muted); margin-bottom: 4px; }
.wechat-id strong { display: block; font-size: 20px; letter-spacing: 1px; color: var(--color-heading); margin-bottom: 10px; word-break: break-all; }
.btn-copy { display: inline-block; padding: 7px 20px; border-radius: var(--radius-pill); border: 1px solid var(--color-primary); background: transparent; color: var(--color-primary); font-size: 13px; font-weight: 600; transition: all var(--transition); }
.btn-copy:hover { background: var(--color-primary); color: #fff; }
.wechat-tip { font-size: 13px; color: var(--color-muted); line-height: 1.6; }

/* Hero Index Bar */
.hero-index { border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(4px); }
.hero-index .container { display: flex; flex-wrap: wrap; justify-content: center; gap: 0; padding: 0 16px; }
.hero-index a { display: inline-block; padding: 10px 18px; font-size: 13px; letter-spacing: 1px; color: var(--color-muted); text-decoration: none; border-right: 1px solid var(--color-border); font-weight: 500; }
.hero-index a:last-child { border-right: none; }
.hero-index a::before { content: "▍"; margin-right: 4px; color: var(--color-gold); }
.hero-index a:hover { color: var(--color-primary); }

/* ===== Services Cards ===== */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; }
.card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); box-shadow: var(--shadow-sm); padding: 28px 24px; transition: all var(--transition); display: flex; flex-direction: column; }
.card:hover { border-color: var(--color-primary-light); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.card-icon { width: 46px; height: 46px; border-radius: var(--radius-btn); background: var(--color-primary-soft); color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 800; margin-bottom: 18px; }
.card h3 { font-size: 18px; font-weight: 700; color: var(--color-heading); margin-bottom: 8px; }
.card p { font-size: 14px; color: var(--color-text); line-height: 1.75; margin-bottom: 14px; flex-grow: 1; }
.card-tag { font-size: 12px; color: var(--color-accent-dark); background: var(--color-accent-soft); border-radius: var(--radius-pill); padding: 4px 12px; display: inline-block; width: fit-content; margin-bottom: 12px; }
.card-link { font-size: 14px; font-weight: 600; color: var(--color-primary); text-decoration: none; }
.card-link:hover { color: var(--color-primary-dark); text-decoration: underline; }

/* ===== Stats ===== */
.stats { background: var(--color-bg-light); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; }
.stat-item { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 32px 20px; text-align: center; transition: all var(--transition); }
.stat-item:hover { border-color: var(--color-primary-light); box-shadow: var(--shadow-md); }
.stat-number { display: block; font-size: 44px; font-weight: 800; color: var(--color-primary); line-height: 1.2; font-feature-settings: "tnum"; margin-bottom: 6px; letter-spacing: -1px; }
.stat-number small { font-size: 20px; font-weight: 700; color: var(--color-accent); margin-left: 2px; }
.stat-label { font-size: 15px; font-weight: 600; color: var(--color-heading); margin-bottom: 4px; }
.stat-note { font-size: 13px; color: var(--color-muted); }

/* ===== Case Cards ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.case-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-sm); transition: all var(--transition); display: flex; flex-direction: column; }
.case-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--color-primary-light); }
.case-cover { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; background: var(--color-bg-light); }
.case-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex-grow: 1; }
.case-card h3 { font-size: 17px; font-weight: 700; color: var(--color-heading); line-height: 1.4; margin-bottom: 8px; }
.case-card p { font-size: 14px; color: var(--color-text); line-height: 1.75; margin-bottom: 14px; flex-grow: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.case-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.case-tag { font-size: 12px; background: var(--color-primary-soft); color: var(--color-primary); border-radius: var(--radius-pill); padding: 3px 10px; font-weight: 500; }
.case-meta .case-source { font-size: 12px; color: var(--color-muted); margin-left: auto; }
.case-more { text-align: center; margin-top: 36px; }

/* ===== Plan / Flow & Table ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; margin-bottom: 56px; }
.step { position: relative; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 28px 22px; text-align: center; transition: all var(--transition); }
.step:hover { box-shadow: var(--shadow-md); border-color: var(--color-primary-light); }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%; background: var(--color-primary); color: #fff; font-size: 17px; font-weight: 700; margin-bottom: 14px; }
.step h4 { font-size: 16px; font-weight: 700; color: var(--color-heading); margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--color-muted); line-height: 1.7; }

.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius-card); background: var(--color-card); box-shadow: var(--shadow-sm); }
.plan-table { width: 100%; min-width: 680px; border-collapse: collapse; }
.plan-table th, .plan-table td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 14px; }
.plan-table th { background: var(--color-bg-light); font-weight: 700; color: var(--color-heading); }
.plan-table th:first-child { width: 120px; }
.plan-table tr:last-child td { border-bottom: none; }
.plan-table tbody tr { transition: background var(--transition); }
.plan-table tbody tr:hover { background: var(--color-primary-soft); }
.plan-table td:first-child { font-weight: 600; color: var(--color-heading); white-space: nowrap; }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 40px auto 0; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-card); background: var(--color-card); margin-bottom: 14px; transition: box-shadow var(--transition), border-color var(--transition); overflow: hidden; }
.faq-item[open] { box-shadow: var(--shadow-md); border-color: var(--color-primary-light); }
.faq-item summary { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 18px 24px; cursor: pointer; font-size: 15px; font-weight: 600; color: var(--color-heading); min-height: 48px; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--color-primary); }
.faq-q { display: flex; align-items: center; gap: 10px; }
.faq-q .num { color: var(--color-primary); font-weight: 700; font-size: 14px; }
.faq-icon { width: 22px; height: 22px; flex-shrink: 0; position: relative; transition: transform .3s ease; }
.faq-icon::before, .faq-icon::after { content: ""; position: absolute; background: var(--color-muted); border-radius: 2px; transition: all .3s ease; }
.faq-icon::before { width: 14px; height: 2px; top: 10px; left: 4px; }
.faq-icon::after { width: 2px; height: 14px; top: 4px; left: 10px; }
.faq-item[open] .faq-icon { transform: rotate(45deg); }
.faq-answer { margin: 0 24px 20px; padding: 16px 20px; background: var(--color-bg); border-left: 3px solid var(--color-primary); border-radius: 0 var(--radius-btn) var(--radius-btn) 0; font-size: 14px; line-height: 1.8; color: var(--color-text); }

/* ===== CTA / Contact ===== */
.contact-section { background: linear-gradient(135deg, #FBF3EC 0%, #F7FAFC 60%); border-top: 1px solid var(--color-border); }
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact-info h2 { font-size: 30px; font-weight: 700; color: var(--color-heading); line-height: 1.35; margin-bottom: 16px; }
.contact-info p { font-size: 16px; color: var(--color-text); line-height: 1.85; margin-bottom: 24px; }
.contact-wechat { display: inline-flex; align-items: center; gap: 10px; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 14px 20px; box-shadow: var(--shadow-sm); }
.contact-wechat .label { font-size: 13px; color: var(--color-muted); }
.contact-wechat strong { font-size: 18px; color: var(--color-heading); letter-spacing: 1px; }
.contact-note { font-size: 13px; color: var(--color-muted); margin-top: 16px; line-height: 1.7; }

.contact-form { background: var(--color-card); border: 1px solid var(--color-border); border-radius: 16px; box-shadow: var(--shadow-md); padding: 32px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--color-heading); margin-bottom: 6px; }
.form-group .required { color: var(--color-accent); }
.form-group .optional { color: var(--color-muted); font-weight: 400; font-size: 12px; }
.form-group input, .form-group textarea { width: 100%; height: 44px; border: 1px solid #D5E0EA; border-radius: var(--radius-btn); background: var(--color-bg); padding: 0 14px; font-size: 15px; transition: border-color var(--transition), box-shadow var(--transition); }
.form-group textarea { height: auto; min-height: 88px; padding: 12px 14px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(58, 107, 158, 0.15); background: #fff; }
.form-group input:hover, .form-group textarea:hover { border-color: var(--color-primary-light); }

/* ===== Footer ===== */
.site-footer { background: var(--color-footer-bg); color: var(--color-footer-text); padding: 56px 0 0; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.footer-brand { font-size: 22px; font-weight: 800; color: var(--color-footer-heading); letter-spacing: 1px; margin-bottom: 12px; display: block; }
.footer-top p { font-size: 14px; line-height: 1.8; margin-bottom: 14px; }
.footer-col h4 { font-size: 15px; font-weight: 700; color: var(--color-footer-heading); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul a { color: var(--color-footer-text); font-size: 14px; text-decoration: none; transition: color var(--transition); }
.footer-col ul a:hover { color: var(--color-gold); padding-left: 4px; }
.footer-wechat { background: rgba(255, 255, 255, 0.06); border-radius: var(--radius-card); padding: 16px; }
.footer-wechat .label { font-size: 13px; color: var(--color-footer-text); opacity: 0.8; display: block; margin-bottom: 4px; }
.footer-wechat .wxid { font-size: 18px; color: #fff; letter-spacing: 1px; }
.footer-wechat .btn-copy { margin-top: 10px; border-color: var(--color-gold); color: var(--color-gold); background: transparent; }
.footer-wechat .btn-copy:hover { background: var(--color-gold); color: var(--color-footer-bg); }
.footer-bottom { padding: 20px 0; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; font-size: 13px; color: var(--color-footer-text); opacity: 0.75; }
.footer-bottom a { color: var(--color-footer-text); }
.footer-bottom a:hover { color: var(--color-gold); }

/* ===== Responsive ===== */
@media (max-width: 1200px) {
  :root { --space-section: 80px; }
  .container { padding: 0 20px; }
  .grid-4 { gap: 20px; }
  .steps { gap: 20px; }
}

@media (max-width: 992px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; padding-bottom: 56px; }
  .wechat-card { margin: 0 auto; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --space-section: 60px; }
  .header-top { padding: 12px 0 8px; }
  .brand { font-size: 24px; }
  .menu-toggle { display: inline-flex; align-items: center; gap: 8px; }
  .nav-links { display: none; flex-direction: column; width: 100%; }
  .nav-links.open { display: flex; border-top: 1px solid var(--color-border); }
  .nav-links a { border-right: none; border-bottom: 1px solid var(--color-border); padding: 14px 24px; }
  .nav-links a:last-child { border-bottom: none; }
  .hero { padding-top: 40px; }
  .hero h1 { font-size: 28px; }
  .hero-sub { font-size: 16px; }
  .hero-index a { padding: 8px 12px; font-size: 12px; }
  .section-desc { font-size: 15px; }
  .contact-wrap { grid-template-columns: 1fr; gap: 32px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .step { padding: 20px 16px; }
}

@media (max-width: 576px) {
  .container { padding: 0 16px; }
  .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-item { padding: 22px 12px; }
  .stat-number { font-size: 34px; }
  .case-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .steps { grid-template-columns: 1fr; }
  .section-head h2 { font-size: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .contact-form { padding: 24px 20px; }
}