/* ============================================
   火影本子 · huoyingbenziz.com.cn
   设计概念：和簿·火卷 (Washi Fire Scroll)
   ============================================ */

/* ---- 基础重置 ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --paper: #F6F1E7;
  --paper-light: #FFFDF7;
  --paper-deep: #EBE3D3;
  --ink: #2D2B26;
  --ink-soft: #6F675E;
  --vermilion: #E0512B;
  --vermilion-dark: #C03E1D;
  --vermilion-wash: rgba(224, 81, 43, 0.12);
  --indigo: #2F4A63;
  --indigo-wash: rgba(47, 74, 99, 0.08);
  --gold: #D29B46;
  --gold-wash: rgba(210, 155, 70, 0.16);
  --line: #E0D7C7;
  --line-strong: #CBBFA8;
  --shadow-soft: 0 2px 14px rgba(45, 43, 38, 0.07);
  --shadow-lift: 0 10px 30px rgba(45, 43, 38, 0.11);
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 15% 30%, rgba(210, 155, 70, 0.04) 0%, transparent 25%),
    radial-gradient(circle at 85% 70%, rgba(224, 81, 43, 0.03) 0%, transparent 30%);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--vermilion);
  color: #fff;
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--vermilion), var(--gold));
  border-radius: 8px;
  border: 2px solid var(--paper);
}

:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 800;
}

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

/* ---- 核心布局 ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 90px 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--paper-light);
  box-shadow: inset 0 1px 0 rgba(224, 213, 194, 0.4);
}

.section:nth-child(even)::before {
  content: '火影万象 · 本子藏乾坤';
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: rgba(45, 43, 38, 0.1);
  white-space: nowrap;
  pointer-events: none;
  z-index: 1;
}

.section:nth-child(odd)::after {
  content: '忍';
  position: absolute;
  left: -30px;
  bottom: 40px;
  font-size: 180px;
  font-weight: 900;
  color: rgba(224, 81, 43, 0.035);
  line-height: 1;
  pointer-events: none;
  z-index: 0;
}

/* ---- 导航 ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(246, 241, 231, 0.94);
  backdrop-filter: blur(14px) saturate(0.9);
  -webkit-backdrop-filter: blur(14px) saturate(0.9);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.35s ease;
}

.site-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(100deg, var(--vermilion) 0%, var(--vermilion) 35%, var(--gold) 65%, var(--vermilion) 100%);
  background-size: 200% 100%;
  animation: headerFlow 6s linear infinite;
  z-index: 2;
}

@keyframes headerFlow {
  0% { background-position: 0% 0; }
  100% { background-position: -200% 0; }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.2rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: 0.04em;
  transition: opacity 0.2s;
}

.logo:hover { opacity: 0.85; }

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  background: var(--vermilion);
  color: #fff;
  box-shadow: 0 3px 10px rgba(224, 81, 43, 0.3);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s;
  position: relative;
}

.logo-icon::after {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 7px;
  pointer-events: none;
}

.logo:hover .logo-icon {
  transform: rotate(-8deg) scale(1.06);
  box-shadow: 0 5px 14px rgba(224, 81, 43, 0.38);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.main-nav a:not(.nav-cta) {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding: 6px 2px;
  letter-spacing: 0.02em;
  transition: color 0.25s;
}

.main-nav a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--vermilion);
  border-radius: 3px;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s cubic-bezier(0.6, -0.28, 0.74, 0.44);
}

.main-nav a:not(.nav-cta):hover {
  color: var(--vermilion);
}

.main-nav a:not(.nav-cta):hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  padding: 9px 22px;
  border-radius: var(--radius-sm);
  background: var(--vermilion);
  color: #fff !important;
  font-weight: 600;
  font-size: 0.88rem;
  box-shadow: 0 3px 12px rgba(224, 81, 43, 0.28);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.nav-cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -30%;
  width: 30%;
  height: 2px;
  background: rgba(255, 255, 255, 0.7);
  opacity: 0;
  transform: translateY(-50%);
  transition: left 0.5s ease, opacity 0.3s;
}

.nav-cta:hover {
  background: var(--vermilion-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(224, 81, 43, 0.35);
}

.nav-cta:hover::before {
  left: 120%;
  opacity: 1;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: none;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  transition: border-color 0.3s, background 0.3s;
}

.menu-toggle:hover {
  border-color: var(--vermilion);
  background: var(--vermilion-wash);
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ink);
  border-radius: 3px;
  transition: all 0.3s ease;
}

/* ---- 首页 Hero ---- */
.hero {
  min-height: 78vh;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 48px;
  position: relative;
  padding-top: 140px;
  padding-bottom: 90px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 90% 15%, var(--vermilion-wash) 0%, transparent 42%),
    radial-gradient(ellipse at 10% 85%, var(--indigo-wash) 0%, transparent 45%);
}

.hero::before {
  content: '旋';
  position: absolute;
  right: 60px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 220px;
  font-weight: 900;
  line-height: 1;
  color: rgba(224, 81, 43, 0.05);
  pointer-events: none;
  z-index: 0;
  animation: slowDrift 18s ease-in-out infinite alternate;
}

@keyframes slowDrift {
  0% { transform: translateY(-50%) rotate(0deg) scale(1); }
  100% { transform: translateY(-50%) rotate(8deg) scale(1.06); }
}

/* 卷轴右端装饰线 */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 20%;
  height: 100%;
  background: repeating-linear-gradient(
    115deg,
    transparent 0px,
    transparent 14px,
    rgba(224, 81, 43, 0.04) 14px,
    rgba(224, 81, 43, 0.04) 15px,
    transparent 15px,
    transparent 30px
  );
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  max-width: 680px;
  flex: 1 1 460px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 7px 20px 7px 14px;
  border-radius: 100px;
  margin-bottom: 22px;
  background: var(--paper-light);
  border: 1px dashed rgba(224, 81, 43, 0.4);
  color: var(--vermilion-dark);
  position: relative;
}

.hero-eyebrow::before {
  content: '';
  width: 7px;
  height: 7px;
  background: var(--vermilion);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(224, 81, 43, 0.2);
}

.hero h1 {
  font-size: clamp(2.4rem, 5.2vw, 3.8rem);
  line-height: 1.15;
  margin-bottom: 24px;
  font-weight: 900;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.hero h1 .accent-underline {
  background: linear-gradient(115deg, transparent 0%, transparent 2%, var(--vermilion-wash) 2%, var(--vermilion-wash) 93%, transparent 93%);
  padding: 2px 8px;
  border-radius: 3px;
  color: var(--vermilion-dark);
}

.hero p {
  font-size: 1.08rem;
  opacity: 0.7;
  max-width: 540px;
  margin-bottom: 36px;
  line-height: 1.9;
  color: var(--ink);
  padding-left: 18px;
  border-left: 3px solid var(--gold);
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-image {
  flex: 1 1 380px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lift);
  transform: rotate(1.5deg);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: inherit;
  z-index: 2;
  pointer-events: none;
}

.hero-image::after {
  content: '巻ノ' counter(volume, decimal-leading-zero);
  counter-increment: volume;
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(224, 81, 43, 0.88);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 12px;
  border-radius: 100px;
  backdrop-filter: blur(4px);
  z-index: 3;
}

.hero-image:hover {
  transform: rotate(0deg) scale(1.01);
  box-shadow: 0 14px 38px rgba(45, 43, 38, 0.16);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 320px;
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  letter-spacing: 0.04em;
  line-height: 1;
}

.btn-primary {
  background: var(--vermilion);
  color: #fff;
  box-shadow: 0 4px 16px rgba(224, 81, 43, 0.32);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 12px;
  height: 12px;
  border-top: 2px solid rgba(255, 255, 255, 0.5);
  border-left: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 4px 0 0 0;
  opacity: 0;
  transition: opacity 0.3s;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 9px 24px rgba(224, 81, 43, 0.4);
  background: var(--vermilion-dark);
}

.btn-primary:hover::after { opacity: 1; }

.btn-primary:active {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(224, 81, 43, 0.3);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--indigo);
  color: var(--indigo);
  padding: 12.5px 28px;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-outline::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--indigo);
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: -1;
  border-radius: inherit;
}

.btn-outline:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(47, 74, 99, 0.25);
}

.btn-outline:hover::after {
  transform: translateY(0);
}

/* ---- 标签/标题 ---- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  margin-bottom: 14px;
  color: var(--vermilion);
  text-transform: uppercase;
  position: relative;
}

.section-label::before {
  content: '';
  width: 26px;
  height: 2px;
  background: var(--vermilion);
  border-radius: 4px;
  flex-shrink: 0;
}

.section-label::after {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 16px;
  font-weight: 900;
  line-height: 1.25;
  color: var(--ink);
  position: relative;
  letter-spacing: -0.01em;
}

.section-title::after {
  content: '卷';
  display: inline-block;
  margin-left: 10px;
  font-size: 0.38em;
  font-weight: 700;
  color: var(--vermilion);
  background: var(--vermilion-wash);
  padding: 4px 8px;
  border-radius: 6px;
  vertical-align: super;
  letter-spacing: 0;
}

.section-desc {
  max-width: 640px;
  opacity: 0.68;
  font-size: 1.05rem;
  line-height: 1.9;
  margin-bottom: 44px;
  color: var(--ink);
}

/* ---- 卡片网格 ---- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 26px;
}

.category-card {
  border-radius: var(--radius-md);
  padding: 34px 28px 28px;
  background: var(--paper-light);
  border: 1px solid var(--line);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--vermilion), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s ease;
}

.category-card::after {
  content: '忍';
  position: absolute;
  right: -8px;
  bottom: -18px;
  font-size: 68px;
  font-weight: 900;
  color: rgba(224, 81, 43, 0.06);
  line-height: 1;
  transition: all 0.4s ease;
  pointer-events: none;
}

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

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(224, 81, 43, 0.2);
}

.category-card:hover::after {
  color: rgba(224, 81, 43, 0.16);
  transform: scale(1.1) rotate(-6deg);
}

.card-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.45rem;
  background: var(--vermilion-wash);
  color: var(--vermilion);
  transition: all 0.35s ease;
  border: 1px solid rgba(224, 81, 43, 0.12);
}

.category-card:hover .card-icon {
  background: var(--vermilion);
  color: #fff;
  transform: rotate(-8deg) scale(1.04);
  box-shadow: 0 4px 12px rgba(224, 81, 43, 0.25);
}

.category-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}

.category-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  opacity: 0.75;
  line-height: 1.7;
  margin-bottom: 14px;
}

.card-link {
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--vermilion);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s ease;
}

.card-link::after {
  content: '→';
  font-size: 1.1em;
  transition: transform 0.3s ease;
}

.card-link:hover {
  gap: 10px;
}

.card-link:hover::after {
  transform: translateX(3px);
}

/* ---- 特性块 ---- */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lift);
}

.feature-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(224, 81, 43, 0.08) 0%, transparent 50%, rgba(210, 155, 70, 0.08) 100%);
  z-index: 1;
  pointer-events: none;
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  border-radius: calc(var(--radius-lg) - 12px);
  z-index: 2;
  pointer-events: none;
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s ease;
}

.feature-block:hover .feature-image img {
  transform: scale(1.03);
}

.feature-text {
  position: relative;
  z-index: 2;
}

.feature-text .section-label { margin-bottom: 12px; }
.feature-text h2 { margin-bottom: 18px; font-size: 1.9rem; font-weight: 900; }
.feature-text > p { opacity: 0.68; line-height: 1.85; margin-bottom: 24px; }

.feature-list {
  list-style: none;
  margin-top: 10px;
}

.feature-list li {
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 1rem;
  color: var(--ink);
  border-bottom: 1px dashed var(--line);
  transition: padding-left 0.3s ease;
}

.feature-list li:hover {
  padding-left: 6px;
}

.feature-list li:last-child { border-bottom: none; }

.feature-list li::before {
  content: '✦';
  font-weight: 700;
  color: var(--vermilion);
  font-size: 1.05rem;
  flex-shrink: 0;
}

/* ---- 数据条 ---- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.stat-item {
  padding: 32px 20px 28px;
  border-radius: var(--radius-md);
  background: var(--paper-light);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--vermilion);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 0 0 4px 4px;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.stat-item:hover::before {
  width: 100%;
}

.stat-item::after {
  content: '◆';
  display: block;
  font-size: 0.7rem;
  color: var(--gold);
  margin-top: 10px;
  opacity: 0.6;
  transition: transform 0.3s ease;
}

.stat-item:hover::after {
  transform: rotate(180deg);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--vermilion);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  display: block;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.92rem;
  opacity: 0.6;
  margin-top: 4px;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: 0.06em;
}

/* ---- 内容墙 ---- */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
  position: relative;
  z-index: 2;
}

.content-wall-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--paper-light);
  border: 1px solid var(--line);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.content-wall-item::before {
  content: '本';
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 3;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: rgba(224, 81, 43, 0.92);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 10px rgba(224, 81, 43, 0.35);
  opacity: 0;
  transform: translateY(-6px) scale(0.7) rotate(-12deg);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.content-wall-item:hover::before {
  opacity: 1;
  transform: translateY(0) scale(1) rotate(0deg);
}

.content-wall-item img {
  width: 100%;
  height: 210px;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(224, 81, 43, 0.15);
}

.content-wall-item:hover img {
  transform: scale(1.06) rotate(0.5deg);
}

.content-wall-body {
  padding: 24px 24px 22px;
}

.content-wall-body h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--ink);
  line-height: 1.4;
}

.content-wall-body p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  opacity: 0.72;
  line-height: 1.75;
}

.content-wall-body .content-wall-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--vermilion);
  background: var(--vermilion-wash);
  padding: 2px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

/* ---- FAQ ---- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  background: var(--paper-light);
  transition: all 0.35s ease;
  position: relative;
}

.faq-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--vermilion);
  opacity: 0;
  transform: scaleY(0);
  transform-origin: center;
  transition: all 0.35s ease;
}

.faq-item.open,
.faq-item:hover {
  border-color: rgba(224, 81, 43, 0.3);
  box-shadow: var(--shadow-soft);
}

.faq-item.open::before {
  opacity: 1;
  transform: scaleY(1);
}

.faq-item .faq-question {
  padding: 18px 54px 18px 22px;
  font-weight: 600;
  font-size: 1.02rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ink);
  position: relative;
  gap: 16px;
  transition: color 0.3s;
}

.faq-item:hover .faq-question {
  color: var(--vermilion-dark);
}

.faq-item .faq-question::before {
  content: 'Q';
  font-weight: 900;
  color: var(--vermilion);
  font-size: 0.9rem;
  border: 1.5px solid var(--vermilion);
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-right: 6px;
}

.faq-item .faq-question::after {
  content: '';
  position: absolute;
  right: 20px;
  width: 12px;
  height: 12px;
  border-right: 2.5px solid var(--vermilion);
  border-bottom: 2.5px solid var(--vermilion);
  transform: rotate(-45deg);
  transition: transform 0.35s ease;
  top: calc(50% - 7px);
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
  top: calc(50% - 4px);
}

.faq-item .faq-answer {
  padding: 0 22px 20px 62px;
  display: none;
  opacity: 0.7;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--ink);
}

.faq-item .faq-answer::before {
  content: 'A';
  font-weight: 900;
  color: var(--gold);
  font-size: 0.85rem;
  margin-right: 6px;
  display: inline-block;
  border: 1.5px solid var(--gold);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  text-align: center;
  line-height: 19px;
  font-size: 0.75rem;
  vertical-align: 2px;
}

.faq-item.open .faq-answer {
  display: block;
  animation: answerReveal 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes answerReveal {
  from {
    opacity: 0;
    transform: translateY(-8px);
    filter: blur(4px);
  }
  to {
    opacity: 0.7;
    transform: translateY(0);
    filter: blur(0);
  }
}

/* ---- CTA 横幅 ---- */
.cta-banner {
  padding: 60px 32px 56px;
  text-align: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(115deg, var(--vermilion) 0%, #E8663B 45%, var(--gold) 135%);
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(224, 81, 43, 0.28);
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 15px 15px;
  animation: spiralRotate 24s linear infinite;
  pointer-events: none;
}

@keyframes spiralRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.cta-banner::after {
  content: '本';
  position: absolute;
  bottom: -34px;
  left: -4px;
  font-size: 160px;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.1);
  line-height: 1;
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  margin-bottom: 10px;
  font-weight: 900;
  position: relative;
  z-index: 2;
  letter-spacing: 0.02em;
}

.cta-banner h2::after {
  content: '巻';
  display: inline-block;
  margin-left: 8px;
  font-size: 0.5em;
  color: rgba(255, 255, 255, 0.8);
}

.cta-banner p {
  position: relative;
  z-index: 2;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 24px;
  font-size: 1.02rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--vermilion);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 2;
}

.cta-banner .btn-primary::after {
  border-color: rgba(224, 81, 43, 0.35);
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.14);
  background: var(--paper-light);
  color: var(--vermilion-dark);
}

/* ---- 页脚 ---- */
.site-footer {
  padding: 68px 0 30px;
  background:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 6px,
      rgba(224, 81, 43, 0.02) 6px,
      rgba(224, 81, 43, 0.02) 7px
    ),
    var(--paper-deep);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gold);
  z-index: 1;
}

.site-footer::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(45, 43, 38, 0.15);
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 44px;
  margin-bottom: 44px;
}

.footer-brand {
  position: relative;
}

.footer-brand .logo {
  margin-bottom: 12px;
}

.footer-brand p {
  opacity: 0.58;
  font-size: 0.92rem;
  line-height: 1.85;
  margin-top: 14px;
  max-width: 320px;
  color: var(--ink);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-col h4 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--ink);
  position: relative;
  padding-bottom: 10px;
  letter-spacing: 0.05em;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--vermilion), var(--gold));
  border-radius: 3px;
}

.footer-col a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.25s ease;
  display: inline-block;
  position: relative;
  padding-left: 0;
}

.footer-col a:hover {
  color: var(--vermilion);
  transform: translateX(5px);
}

.footer-col a::before {
  content: '·';
  margin-right: 6px;
  color: var(--gold);
  opacity: 0;
  transition: opacity 0.25s;
}

.footer-col a:hover::before {
  opacity: 1;
}

.footer-bottom {
  border-top: 1px solid rgba(45, 43, 38, 0.12);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
}

.footer-bottom::before {
  content: '✦';
  display: block;
  margin-bottom: 8px;
  color: var(--vermilion);
  font-size: 0.8rem;
}

/* ---- 工具类 ---- */
.text-accent {
  color: var(--vermilion);
  font-weight: 700;
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.68;
  line-height: 1.95;
  font-size: 1rem;
  color: var(--ink);
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* 内边距工具补充 */
.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }

/* ---- 响应式 ---- */
@media (max-width: 992px) {
  .section { padding: 70px 0; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
  .cta-banner { padding: 48px 24px; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0 64px; }
  .section:nth-child(even)::before { display: none; }
  .section:nth-child(odd)::after { display: none; }

  .feature-block { grid-template-columns: 1fr; gap: 36px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }

  .hero {
    padding-top: 110px;
    padding-bottom: 56px;
    gap: 32px;
  }

  .hero h1 { font-size: clamp(2rem, 7vw, 2.8rem); }

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(246, 241, 231, 0.98);
    backdrop-filter: blur(16px);
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    box-shadow: 0 16px 24px rgba(45, 43, 38, 0.08);
  }

  .main-nav.open {
    display: flex;
    animation: navDrop 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }

  @keyframes navDrop {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .main-nav li { width: 100%; }

  .main-nav a:not(.nav-cta) {
    display: block;
    padding: 12px 8px;
    font-size: 1.02rem;
    border-bottom: 1px dashed var(--line);
    width: 100%;
  }

  .main-nav a:not(.nav-cta)::after { display: none; }

  .nav-cta {
    display: block;
    width: 100%;
    margin-top: 12px;
    text-align: center;
    padding: 12px;
  }

  .menu-toggle { display: flex; }

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

  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; justify-content: center; }

  .category-card { padding: 26px 22px; }
  .cta-banner { padding: 40px 20px; border-radius: 16px; }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .hero-buttons { flex-direction: column; }

  .hero-content { flex-basis: 100%; }
  .hero-image {
    flex-basis: 100%;
    transform: rotate(0deg);
  }

  .hero h1 {
    font-size: 2rem;
    line-height: 1.2;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .section-title::after {
    display: none;
  }

  .stat-number { font-size: 2.1rem; }

  .stat-item { padding: 24px 14px; }

  .cta-banner::after {
    font-size: 120px;
    bottom: -20px;
  }

  .content-wall-item img { height: 180px; }

  .faq-item .faq-question {
    padding: 16px 48px 16px 16px;
    font-size: 0.95rem;
  }

  .faq-item .faq-answer {
    padding: 0 18px 16px 54px;
  }

  .feature-list li { font-size: 0.92rem; }
  .footer-bottom { font-size: 0.78rem; }
}

/* ---- 打印支持 ---- */
@media print {
  .site-header { position: static; }
  .hero { min-height: auto; }
  .main-nav, .menu-toggle, .nav-cta { display: none; }
  .hero-buttons { display: none; }
  .btn { box-shadow: none; }
  .cta-banner { box-shadow: none; }
}