/* ===== 设计变量 ===== */
:root {
  --primary: #ff6b35;
  --primary-dark: #e5541f;
  --primary-light: #ff9466;
  --secondary: #7b2ff7;
  --secondary-light: #a36bf9;
  --accent: #ffb800;
  --ink: #141224;
  --text-body: #44445a;
  --text-muted: #7a7a92;
  --bg-deep: #0d0b1a;
  --bg-soft: #f8f6f3;
  --bg-white: #ffffff;
  --border: #e7e4ee;
  --radius: 18px;
  --radius-lg: 32px;
  --shadow-sm: 0 2px 12px rgba(20, 18, 36, 0.06);
  --shadow: 0 10px 35px rgba(20, 18, 36, 0.09);
  --shadow-lg: 0 24px 60px rgba(20, 18, 36, 0.16);
  --gradient-primary: linear-gradient(135deg, #ff6b35 0%, #ff2e63 100%);
  --gradient-brand: linear-gradient(135deg, #ff6b35 0%, #7b2ff7 100%);
  --gradient-deep: linear-gradient(135deg, #141224 0%, #241e3e 100%);
  --transition: all .3s cubic-bezier(.4, 0, .2, 1);
}
/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-soft); color: var(--text-body);
  line-height: 1.7; font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
ul, ol { list-style: none; }
button, input { font-family: inherit; font-size: inherit; border: none; outline: none; background: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-pad { padding: 96px 0; }
@media (max-width: 768px) { .section-pad { padding: 64px 0; } }

/* ===== 通用组件 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 30px; border-radius: 50px; font-weight: 600; font-size: 15px;
  line-height: 1.2; cursor: pointer; transition: var(--transition);
  border: 2px solid transparent; white-space: nowrap;
}
.btn-primary { background: var(--gradient-primary); color: #fff; box-shadow: 0 8px 24px rgba(255, 107, 53, 0.35); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(255, 107, 53, 0.45); }
.btn-primary:active { transform: translateY(-1px); }
.btn-outline { background: transparent; border-color: rgba(255,255,255,.6); color: #fff; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(20,18,36,.3); }
.btn-light { background: #fff; color: var(--ink); box-shadow: var(--shadow); }
.btn-light:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-block { width: 100%; }

.tag {
  display: inline-block; padding: 6px 16px; border-radius: 50px;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25);
  color: #fff; font-size: 13px; font-weight: 500; letter-spacing: .3px;
}
.tag-accent { background: rgba(255, 184, 0, .15); border-color: rgba(255, 184, 0, .4); color: var(--accent); }
.tag-soft { background: #f1edf9; border-color: transparent; color: var(--secondary); }

.badge {
  display: inline-block; padding: 6px 18px; border-radius: 50px;
  font-size: 13px; font-weight: 600; letter-spacing: 1px;
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.3);
  color: #fff; backdrop-filter: blur(8px);
}
.badge-accent {
  background: linear-gradient(135deg, rgba(255,184,0,.2), rgba(255,107,53,.2));
  border-color: rgba(255,184,0,.5); color: var(--accent);
}

.section-head { text-align: center; max-width: 720px; margin: 0 auto 60px; }
.section-head .section-tag {
  display: inline-block; padding: 6px 20px; border-radius: 50px;
  background: rgba(123, 47, 247, .08); color: var(--secondary);
  font-size: 14px; font-weight: 700; letter-spacing: 1px; margin-bottom: 18px;
}
.section-head h2 { font-size: 40px; font-weight: 800; color: var(--ink); line-height: 1.25; margin-bottom: 16px; letter-spacing: -1px; }
.section-head p { font-size: 16px; color: var(--text-muted); line-height: 1.8; }
@media (max-width: 768px) {
  .section-head h2 { font-size: 28px; }
  .section-head { margin-bottom: 40px; }
}

/* ===== 导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px); border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 24px;
}
.logo {
  font-size: 17px; font-weight: 800; color: var(--ink); letter-spacing: -.3px;
  display: flex; align-items: center; gap: 8px; white-space: nowrap;
}
.logo-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--gradient-primary); display: inline-block; flex-shrink: 0;
}
.main-nav ul { display: flex; align-items: center; gap: 8px; }
.main-nav a {
  padding: 8px 18px; border-radius: 50px; font-size: 15px; font-weight: 600;
  color: var(--text-body); transition: var(--transition);
}
.main-nav a:hover { background: rgba(123, 47, 247, .08); color: var(--secondary); }
.main-nav a.active { background: var(--gradient-primary); color: #fff; box-shadow: 0 4px 14px rgba(255,107,53,.3); }
.header-cta { display: flex; align-items: center; gap: 12px; }
.header-cta .btn { padding: 9px 22px; font-size: 14px; }
@media (max-width: 768px) {
  .header-inner { height: 64px; }
  .logo { font-size: 14px; }
  .main-nav a { padding: 6px 14px; font-size: 14px; }
  .header-cta .btn { display: none; }
}

/* ===== Hero ===== */
.hero {
  position: relative; background: var(--bg-deep); color: #fff;
  padding: 120px 0 100px; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
  opacity: .4;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(13,11,26,.95) 0%, rgba(13,11,26,.7) 55%, rgba(123,47,247,.35) 100%);
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 72px; align-items: center;
}
.hero-badge { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 24px; }
.hero-badge i { font-size: 16px; }
.hero h1 {
  font-size: 46px; font-weight: 800; line-height: 1.2; letter-spacing: -1.5px;
  margin-bottom: 20px; color: #fff;
}
.hero h1 .gradient-text {
  background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc { font-size: 17px; line-height: 1.9; color: rgba(255,255,255,.85); max-width: 560px; margin-bottom: 32px; }
.hero-toc { margin-bottom: 32px; }
.hero-toc .toc-label {
  display: block; font-size: 14px; font-weight: 700; color: var(--accent);
  letter-spacing: 1px; margin-bottom: 12px;
}
.toc-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 40px; border-top: 1px solid rgba(255,255,255,.15); padding-top: 28px; }
.hero-stat strong {
  display: block; font-size: 30px; font-weight: 800; color: var(--accent); line-height: 1.2;
}
.hero-stat span { font-size: 14px; color: rgba(255,255,255,.7); }

.hero-card {
  background: #fff; border-radius: var(--radius-lg); padding: 24px;
  box-shadow: 0 30px 80px rgba(0,0,0,.35); color: var(--text-body);
}
.book-cover {
  position: relative; border-radius: 20px; overflow: hidden;
  margin-bottom: 20px; box-shadow: 0 8px 28px rgba(0,0,0,.15);
}
.book-cover img { width: 100%; height: 260px; object-fit: cover; }
.book-cover::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(13,11,26,.75) 0%, transparent 50%);
}
.pdf-badge {
  position: absolute; top: 16px; right: 16px; z-index: 2;
  background: var(--gradient-primary); color: #fff; font-size: 12px; font-weight: 800;
  padding: 6px 14px; border-radius: 6px; letter-spacing: 1px;
  box-shadow: 0 4px 14px rgba(255,107,53,.5);
}
.book-title {
  position: absolute; bottom: 16px; left: 20px; right: 20px; z-index: 2;
  color: #fff; font-size: 16px; font-weight: 700; line-height: 1.4;
}
.download-form h3 { font-size: 20px; font-weight: 800; color: var(--ink); margin-bottom: 18px; }
.download-form input {
  width: 100%; padding: 13px 18px; border-radius: 12px; margin-bottom: 12px;
  background: #f5f4fa; border: 2px solid transparent; font-size: 15px;
  transition: var(--transition); color: var(--ink);
}
.download-form input::placeholder { color: #a5a3b8; }
.download-form input:focus { border-color: var(--secondary); background: #fff; box-shadow: 0 0 0 4px rgba(123,47,247,.12); }
.form-note { font-size: 12px; color: var(--text-muted); text-align: center; margin-top: 12px; line-height: 1.6; }
@media (max-width: 992px) {
  .hero { padding: 90px 0 70px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero h1 { font-size: 34px; }
  .hero-card { max-width: 480px; }
}
@media (max-width: 768px) {
  .hero { padding: 64px 0 56px; }
  .hero h1 { font-size: 28px; }
  .hero-desc { font-size: 15px; }
  .hero-stats { gap: 24px; }
  .hero-stat strong { font-size: 24px; }
  .book-cover img { height: 200px; }
}

/* ===== 功能板块 ===== */
.features { background: var(--bg-white); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card {
  background: var(--bg-soft); border-radius: var(--radius); padding: 40px 32px;
  border: 1px solid var(--border); transition: var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--gradient-primary); opacity: 0; transition: var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 64px; height: 64px; border-radius: 20px; display: flex; align-items: center; justify-content: center;
  font-size: 26px; color: #fff; margin-bottom: 24px;
  background: var(--gradient-brand); box-shadow: 0 8px 20px rgba(123,47,247,.25);
}
.feature-icon.icon-orange { background: var(--gradient-primary); box-shadow: 0 8px 20px rgba(255,107,53,.25); }
.feature-icon.icon-purple { background: var(--gradient-brand); box-shadow: 0 8px 20px rgba(123,47,247,.25); }
.feature-icon.icon-gold { background: linear-gradient(135deg, #ffb800, #ff6b35); box-shadow: 0 8px 20px rgba(255,184,0,.3); }
.feature-card h3 { font-size: 20px; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.feature-card p { font-size: 15px; line-height: 1.8; color: var(--text-muted); }
@media (max-width: 992px) {
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 30px 24px; }
}

/* ===== 数据指标 ===== */
.stats {
  background: var(--gradient-deep); color: #fff; position: relative; overflow: hidden;
}
.stats::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat; opacity: .12;
}
.stats .container { position: relative; z-index: 1; }
.stats .section-head h2 { color: #fff; }
.stats .section-head p { color: rgba(255,255,255,.7); }
.stats .section-tag { background: rgba(255,184,0,.15); color: var(--accent); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; text-align: center; }
.stat-item {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius); padding: 36px 20px; backdrop-filter: blur(8px);
  transition: var(--transition);
}
.stat-item:hover { background: rgba(255,255,255,.1); transform: translateY(-4px); }
.stat-item strong {
  display: block; font-size: 44px; font-weight: 800; line-height: 1.2;
  background: linear-gradient(135deg, var(--accent), var(--primary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-item span { font-size: 15px; color: rgba(255,255,255,.75); display: block; margin-top: 6px; }
@media (max-width: 992px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-item strong { font-size: 34px; }
}

/* ===== 合集目录 ===== */
.collections { background: var(--bg-soft); }
.collection-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.collection-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: var(--transition);
}
.collection-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.collection-cover { position: relative; height: 180px; overflow: hidden; }
.collection-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.collection-card:hover .collection-cover img { transform: scale(1.06); }
.collection-cover::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(13,11,26,.5), transparent);
}
.collection-count {
  position: absolute; bottom: 14px; right: 14px; z-index: 2;
  background: rgba(255,255,255,.92); color: var(--ink); font-size: 13px; font-weight: 700;
  padding: 4px 14px; border-radius: 50px; box-shadow: 0 4px 12px rgba(0,0,0,.15);
}
.collection-body { padding: 26px 28px 30px; }
.collection-body h3 { font-size: 19px; font-weight: 700; color: var(--ink); margin-bottom: 10px; }
.collection-body p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 18px; }
.collection-link {
  display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600;
  color: var(--secondary); transition: var(--transition);
}
.collection-link:hover { gap: 12px; color: var(--primary); }
@media (max-width: 992px) {
  .collection-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .collection-grid { grid-template-columns: 1fr; }
}

/* ===== 流程步骤 ===== */
.steps { background: var(--bg-white); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; counter-reset: step; }
.step-item { text-align: center; position: relative; padding: 0 10px; }
.step-num {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 24px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; font-weight: 800; color: #fff;
  background: var(--gradient-primary); box-shadow: 0 10px 30px rgba(255,107,53,.3);
  position: relative; z-index: 2;
}
.step-item:nth-child(2) .step-num { background: var(--gradient-brand); box-shadow: 0 10px 30px rgba(123,47,247,.3); }
.step-item:nth-child(3) .step-num { background: linear-gradient(135deg, #ffb800, #ff6b35); box-shadow: 0 10px 30px rgba(255,184,0,.3); }
.step-item::before {
  content: ''; position: absolute; top: 36px; left: calc(50% + 55px); right: calc(-50% + 55px);
  height: 2px; background: linear-gradient(90deg, var(--border), transparent);
}
.step-item:last-child::before { display: none; }
.step-item h3 { font-size: 20px; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.step-item p { font-size: 15px; color: var(--text-muted); line-height: 1.75; max-width: 260px; margin: 0 auto; }
@media (max-width: 992px) {
  .steps-grid { grid-template-columns: 1fr; gap: 40px; }
  .step-item::before { display: none; }
}

/* ===== 用户证言 ===== */
.testimonials { background: var(--bg-soft); }
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.testimonial-card {
  background: #fff; border-radius: var(--radius); padding: 36px 32px;
  border: 1px solid var(--border); transition: var(--transition); position: relative;
}
.testimonial-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.testimonial-card .quote-icon {
  font-size: 32px; color: rgba(123,47,247,.15); margin-bottom: 16px;
}
.testimonial-card p { font-size: 15px; line-height: 1.85; color: var(--text-body); margin-bottom: 24px; }
.testimonial-author { display: flex; align-items: center; gap: 14px; }
.testimonial-avatar {
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--gradient-brand); display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 15px; flex-shrink: 0;
}
.testimonial-author .name { font-weight: 700; color: var(--ink); font-size: 15px; }
.testimonial-author .role { font-size: 13px; color: var(--text-muted); }
.stars { color: var(--accent); font-size: 14px; margin-bottom: 16px; letter-spacing: 2px; }
@media (max-width: 992px) {
  .testimonial-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .testimonial-grid { grid-template-columns: 1fr; }
}

/* ===== 资讯区 ===== */
.news { background: var(--bg-white); }
.news-layout { display: grid; grid-template-columns: 1.4fr .6fr; gap: 48px; }
.news-main h2 { font-size: 28px; font-weight: 800; color: var(--ink); margin-bottom: 8px; }
.news-sub { color: var(--text-muted); font-size: 15px; margin-bottom: 28px; }
.news-list li {
  padding: 20px 0; border-bottom: 1px solid var(--border); transition: var(--transition);
}
.news-list li:first-child { padding-top: 0; }
.news-list li:last-child { border-bottom: none; }
.news-list a {
  display: flex; align-items: center; gap: 16px; font-size: 16px; font-weight: 600;
  color: var(--ink); line-height: 1.5; transition: var(--transition);
}
.news-list a:hover { color: var(--primary); }
.news-list .news-date {
  font-size: 13px; color: var(--text-muted); font-weight: 400; flex-shrink: 0;
  background: var(--bg-soft); padding: 4px 12px; border-radius: 50px;
}
.news-list .news-arrow {
  margin-left: auto; color: var(--text-muted); font-size: 14px; flex-shrink: 0;
  opacity: 0; transform: translateX(-6px); transition: var(--transition);
}
.news-list a:hover .news-arrow { opacity: 1; transform: translateX(0); }
.news-side {
  background: var(--bg-soft); border-radius: var(--radius); padding: 32px 28px;
  border: 1px solid var(--border);
}
.news-side h3 {
  font-size: 18px; font-weight: 700; color: var(--ink); margin-bottom: 20px;
  display: flex; align-items: center; gap: 8px;
}
.news-side h3 i { color: var(--secondary); }
.hot-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.hot-tags .tag { background: #fff; border-color: var(--border); color: var(--text-body); }
.hot-tags .tag:hover { background: var(--secondary); border-color: var(--secondary); color: #fff; }
.side-recommend h4 {
  font-size: 14px; font-weight: 700; color: var(--ink); letter-spacing: 1px;
  margin-bottom: 14px; padding-bottom: 10px; border-bottom: 2px solid var(--border);
}
.side-recommend ul li { padding: 8px 0; }
.side-recommend a { font-size: 14px; color: var(--text-body); display: flex; align-items: center; gap: 8px; }
.side-recommend a:hover { color: var(--primary); }
.side-recommend a i { font-size: 10px; color: var(--accent); }
@media (max-width: 992px) {
  .news-layout { grid-template-columns: 1fr; }
  .news-side { order: -1; }
}

/* ===== 保障图标条 ===== */
.guarantee { background: var(--bg-soft); padding: 64px 0; }
.guarantee-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.guarantee-item {
  display: flex; align-items: center; gap: 18px; background: #fff;
  border-radius: var(--radius); padding: 24px 28px; border: 1px solid var(--border);
  transition: var(--transition);
}
.guarantee-item:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.guarantee-icon {
  width: 52px; height: 52px; border-radius: 16px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; color: #fff; background: var(--gradient-brand);
}
.guarantee-icon.g-icon-green { background: linear-gradient(135deg, #00b894, #00a381); }
.guarantee-icon.g-icon-blue { background: linear-gradient(135deg, #4a90d9, #357abd); }
.guarantee-item h4 { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.guarantee-item p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
@media (max-width: 992px) {
  .guarantee-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .guarantee-grid { grid-template-columns: 1fr; }
}

/* ===== FAQ ===== */
.faq { background: var(--bg-white); }
.faq-wrap { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--bg-soft); border-radius: var(--radius); margin-bottom: 16px;
  border: 1px solid var(--border); overflow: hidden; transition: var(--transition);
}
.faq-item.open { box-shadow: var(--shadow); }
.faq-question {
  width: 100%; text-align: left; padding: 22px 28px; font-size: 16px; font-weight: 700;
  color: var(--ink); cursor: pointer; display: flex; align-items: center; gap: 14px;
  transition: var(--transition);
}
.faq-question .faq-icon {
  width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0;
  background: var(--gradient-primary); color: #fff; display: flex; align-items: center;
  justify-content: center; font-size: 14px; transition: var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--secondary); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height .4s ease;
  padding: 0 28px;
}
.faq-item.open .faq-answer { max-height: 400px; padding-bottom: 24px; }
.faq-answer p { font-size: 15px; line-height: 1.85; color: var(--text-body); padding-top: 4px; }

/* ===== CTA ===== */
.cta {
  background: var(--gradient-deep); color: #fff; text-align: center; position: relative; overflow: hidden;
  padding: 100px 0;
}
.cta::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-3.jpg') center/cover no-repeat; opacity: .15;
}
.cta::after {
  content: ''; position: absolute; top: -60%; right: -20%; width: 500px; height: 500px;
  border-radius: 50%; background: rgba(255,107,53,.15); filter: blur(80px);
}
.cta .container { position: relative; z-index: 2; }
.cta h2 { font-size: 40px; font-weight: 800; margin-bottom: 16px; letter-spacing: -1px; color: #fff; }
.cta p { font-size: 17px; color: rgba(255,255,255,.8); max-width: 600px; margin: 0 auto 36px; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.cta .btn-primary { font-size: 16px; padding: 16px 40px; }
.cta .btn-outline { font-size: 16px; padding: 16px 40px; }
@media (max-width: 768px) {
  .cta { padding: 72px 0; }
  .cta h2 { font-size: 28px; }
}

/* ===== 页脚 ===== */
.site-footer { background: var(--ink); color: rgba(255,255,255,.7); padding: 64px 0 32px; }
.footer-top {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 40px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 32px; flex-wrap: wrap;
}
.footer-brand { max-width: 380px; }
.footer-logo {
  font-size: 18px; font-weight: 800; color: #fff; margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.footer-brand p { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,.6); }
.footer-links h4 {
  font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 18px; letter-spacing: .5px;
}
.footer-links ul li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,.6); transition: var(--transition); }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: rgba(255,255,255,.4); flex-wrap: wrap; gap: 12px;
}
.footer-bottom a { color: rgba(255,255,255,.4); }
.footer-bottom a:hover { color: var(--accent); }
.footer-tagline { display: flex; gap: 16px; color: rgba(255,255,255,.4); font-size: 12px; }
@media (max-width: 768px) {
  .footer-top { flex-direction: column; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== 表单提示消息 ===== */
.form-success {
  background: #dff5e8; color: #0a9e5f; border-radius: 12px; padding: 14px 18px;
  font-size: 14px; font-weight: 600; text-align: center; margin-top: 4px;
  display: none;
}
.form-success.show { display: block; animation: fadeInUp .4s ease; }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 焦点可见性 ===== */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid rgba(123,47,247,.5); outline-offset: 2px;
}

/* ===== 多屏适配 ===== */
@media (max-width: 1024px) {
  .hero-inner { gap: 40px; }
  .hero h1 { font-size: 36px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .collection-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .section-pad { padding: 56px 0; }
  .hero { padding: 56px 0 48px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .hero-stats { flex-wrap: wrap; gap: 20px; }
  .feature-grid, .collection-grid, .testimonial-grid, .steps-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .cta-actions { flex-direction: column; align-items: center; }
  .cta-actions .btn { width: 100%; max-width: 320px; }
}
@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .logo { font-size: 13px; }
  .hero h1 { font-size: 26px; letter-spacing: -.5px; }
  .hero-desc { font-size: 15px; }
  .hero-card { padding: 18px; }
  .book-cover img { height: 180px; }
  .badge { font-size: 12px; padding: 4px 14px; }
  .tag { font-size: 12px; padding: 4px 12px; }
  .section-head h2 { font-size: 24px; }
  .stat-item strong { font-size: 30px; }
  .guarantee-item { padding: 18px 20px; }
  .faq-question { padding: 18px 20px; font-size: 15px; }
  .faq-answer { padding: 0 20px; }
  .faq-item.open .faq-answer { padding: 0 20px 20px; }
  .footer-logo { font-size: 15px; }
}