```css
:root {
  --paper: #FDF6E3;
  --paper-deep: #F2E8CF;
  --card-bg: #FFFDF7;
  --ink-red: #FF4B3E;
  --ink-blue: #2B23D1;
  --ink-yellow: #FFC123;
  --ink-green: #00A878;
  --ink-black: #141414;
  --ink-gray: #6B6355;
  --border-dark: 2px solid var(--ink-black);
  --stamp-shadow: 3px 3px 0 var(--ink-black);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background-color: var(--paper);
  color: var(--ink-black);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* 纸张噪点纹理 */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.045'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9998;
}

::selection {
  background: var(--ink-yellow);
  color: var(--ink-black);
}

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--paper-deep);
}
::-webkit-scrollbar-thumb {
  background: var(--ink-gray);
  border-radius: 5px;
  border: 2px solid var(--paper-deep);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--ink-red);
}

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

a {
  color: inherit;
}

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

.section {
  padding: 96px 0;
  position: relative;
}

.section:nth-child(even) {
  background-color: var(--paper-deep);
  background-image: radial-gradient(rgba(20,20,20,0.055) 1px, transparent 1px);
  background-size: 28px 28px;
  border-top: 2px dashed rgba(20,20,20,0.14);
  border-bottom: 2px dashed rgba(20,20,20,0.14);
}

/* ========== 导航 ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(253, 246, 227, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 3px solid var(--ink-black);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--ink-black);
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  background: var(--ink-red);
  color: #fff;
  border: 2px solid var(--ink-black);
  box-shadow: 2px 2px 0 var(--ink-black);
  transform: rotate(-4deg);
  font-weight: 900;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.main-nav li {
  position: relative;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-black);
  padding: 6px 12px;
  border-radius: 4px;
  transition: all 0.22s ease;
  position: relative;
}

.main-nav a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 100%;
  bottom: 2px;
  height: 3px;
  background: var(--ink-yellow);
  transition: right 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.main-nav a:not(.nav-cta):hover::after {
  right: 12px;
}

.nav-cta {
  background: var(--ink-red);
  color: #fff !important;
  font-weight: 700;
  padding: 10px 22px !important;
  border-radius: 4px;
  border: 2px solid var(--ink-black);
  box-shadow: 2px 2px 0 var(--ink-black);
  margin-left: 14px;
  transition: all 0.2s ease;
}

.nav-cta:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--ink-black);
  background: var(--ink-blue);
}

.menu-toggle {
  display: none;
  background: none;
  border: 2px solid var(--ink-black);
  border-radius: 4px;
  width: 42px;
  height: 42px;
  cursor: pointer;
  position: relative;
  box-shadow: 2px 2px 0 var(--ink-black);
}

.menu-toggle::before {
  content: '';
  position: absolute;
  top: 19px;
  left: 9px;
  width: 18px;
  height: 2.5px;
  background: var(--ink-black);
  box-shadow: 0 -6px 0 var(--ink-black), 0 6px 0 var(--ink-black);
}

/* ========== 首页Hero ========== */
.hero {
  min-height: 78vh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  padding-bottom: 80px;
  position: relative;
  background:
    radial-gradient(circle at 82% 24%, rgba(255, 193, 35, 0.4) 0%, transparent 45%),
    radial-gradient(circle at 8% 72%, rgba(0, 168, 120, 0.22) 0%, transparent 38%),
    var(--paper);
  overflow: hidden;
}

.hero::before {
  content: '✦';
  position: absolute;
  top: 110px;
  right: 12%;
  font-size: clamp(100px, 14vw, 300px);
  opacity: 0.17;
  color: var(--ink-blue);
  line-height: 1;
  animation: slowFloat 9s ease-in-out infinite;
  z-index: 0;
  pointer-events: none;
}

.hero::after {
  content: '✛ 每日大赛 ✛ 每日大赛';
  position: absolute;
  bottom: 36px;
  left: 0;
  width: 100%;
  background: var(--ink-blue);
  color: #fff;
  padding: 10px 0;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-align: center;
  transform: rotate(0.6deg);
  z-index: 1;
  pointer-events: none;
  border-top: 2px solid var(--ink-black);
  border-bottom: 2px solid var(--ink-black);
}

.hero-content {
  max-width: 760px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 800;
  padding: 6px 18px;
  border-radius: 0;
  margin-bottom: 28px;
  background: var(--ink-yellow);
  border: 2px solid var(--ink-black);
  box-shadow: 2px 2px 0 var(--ink-black);
  transform: rotate(-1.2deg);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--ink-black);
  display: inline-block;
}

.hero h1 span {
  color: var(--ink-red);
  position: relative;
}

.hero p {
  font-size: 1.12rem;
  opacity: 0.75;
  color: var(--ink-gray);
  max-width: 580px;
  margin-bottom: 38px;
  font-weight: 400;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid var(--ink-black);
  text-decoration: none;
  transition: all 0.18s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.btn-primary {
  background: var(--ink-red);
  color: #fff;
  box-shadow: 3px 3px 0 var(--ink-black);
}

.btn-primary:hover {
  background: var(--ink-blue);
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--ink-black);
}

.btn-outline {
  background: transparent;
  color: var(--ink-blue);
  border-color: var(--ink-blue);
  box-shadow: 3px 3px 0 rgba(43, 35, 209, 0.35);
}

.btn-outline:hover {
  background: var(--ink-blue);
  color: #fff;
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--ink-black);
}

/* ========== 标签/标题 ========== */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 18px;
  color: var(--ink-red);
  background: rgba(255, 75, 62, 0.08);
  border-left: 4px solid var(--ink-red);
  padding: 4px 14px 4px 10px;
  transform: rotate(-0.8deg);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  position: relative;
  line-height: 1.2;
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  color: var(--ink-gray);
  font-size: 1rem;
  margin-bottom: 48px;
  line-height: 1.7;
}

/* ========== 卡片网格 ========== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.category-card {
  background: var(--card-bg);
  border-radius: 6px;
  padding: 32px 28px;
  border: 2px solid var(--ink-black);
  box-shadow: 4px 4px 0 var(--ink-black);
  transition: all 0.22s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 8px;
  right: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-yellow);
  border: 1.5px solid var(--ink-black);
}

.category-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--ink-blue);
}

.category-card:hover::before {
  background: var(--ink-green);
}

.card-icon {
  width: 50px;
  height: 50px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
  background: var(--paper-deep);
  border: 2px solid var(--ink-black);
}

.category-card h3 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 0.88rem;
  color: var(--ink-gray);
  line-height: 1.6;
  margin-bottom: 18px;
}

.card-link {
  font-weight: 700;
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--ink-red);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.card-link::after {
  content: '→';
  transition: transform 0.2s;
}

.card-link:hover {
  border-bottom-color: var(--ink-red);
}

.card-link:hover::after {
  transform: translateX(4px);
}

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

.feature-image {
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid var(--ink-black);
  box-shadow: 6px 6px 0 var(--ink-yellow);
  position: relative;
  aspect-ratio: 4 / 3;
}

.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.feature-text {
  position: relative;
}

.feature-text h3 {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.feature-text > p {
  color: var(--ink-gray);
  margin-bottom: 22px;
  line-height: 1.7;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  border-bottom: 1px dashed rgba(20, 20, 20, 0.12);
}

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

.feature-list li::before {
  content: '✓';
  font-weight: 900;
  color: var(--ink-green);
  background: rgba(0, 168, 120, 0.12);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1.5px solid var(--ink-green);
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* ========== 数据条 ========== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 36px 20px;
  border-radius: 6px;
  background: var(--card-bg);
  border: 2px solid var(--ink-black);
  box-shadow: 3px 3px 0 var(--ink-black);
  transition: all 0.22s ease;
  position: relative;
}

.stat-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--ink-red);
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  color: var(--ink-red);
  letter-spacing: -0.03em;
  position: relative;
  display: inline-block;
}

.stat-number::before {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 10%;
  width: 80%;
  height: 8px;
  background: var(--ink-yellow);
  z-index: -1;
  opacity: 0.6;
}

.stat-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-gray);
  margin-top: 12px;
  letter-spacing: 1px;
}

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

.content-wall-item {
  background: var(--card-bg);
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  overflow: hidden;
  transition: all 0.22s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 3px 3px 0 rgba(20, 20, 20, 0.19);
}

.content-wall-item:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0 var(--ink-green);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 2px solid var(--ink-black);
  transition: transform 0.4s ease;
}

.content-wall-item:hover img {
  transform: scale(1.04);
}

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

.content-wall-body h3 {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
  line-height: 1.4;
}

.content-wall-body p {
  font-size: 0.85rem;
  color: var(--ink-gray);
  line-height: 1.6;
}

.content-wall-body .meta {
  display: flex;
  gap: 12px;
  margin-top: 14px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink-blue);
}

/* ========== FAQ ========== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  margin-bottom: 14px;
  overflow: hidden;
  cursor: pointer;
  background: var(--card-bg);
  box-shadow: 3px 3px 0 rgba(20, 20, 20, 0.13);
  transition: all 0.2s ease;
}

.faq-item:hover {
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--ink-yellow);
}

.faq-item.open {
  box-shadow: 5px 5px 0 var(--ink-red);
  transform: translate(-2px, -2px);
}

.faq-item .faq-question {
  padding: 18px 22px;
  font-weight: 800;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  color: var(--ink-black);
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.6rem;
  font-weight: 400;
  line-height: 1;
  color: var(--ink-red);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-item .faq-answer {
  padding: 0 22px 20px;
  display: none;
  opacity: 0;
  color: var(--ink-gray);
  font-size: 0.92rem;
  line-height: 1.7;
  animation: fadeSlideDown 0.3s ease forwards;
}

.faq-item.open .faq-answer {
  display: block;
  opacity: 1;
  border-top: 1px dashed rgba(20, 20, 20, 0.15);
  padding-top: 14px;
}

/* ========== CTA横幅 ========== */
.cta-banner {
  padding: 72px 48px;
  text-align: center;
  border-radius: 10px;
  background: var(--ink-blue);
  border: 3px solid var(--ink-black);
  box-shadow: 8px 8px 0 var(--ink-black);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(255, 193, 35, 0.2);
  pointer-events: none;
}

.cta-banner::after {
  content: '✷';
  position: absolute;
  bottom: 20px;
  left: 30px;
  font-size: 80px;
  color: rgba(255, 255, 255, 0.1);
  line-height: 1;
}

.cta-banner h2 {
  color: #fff !important;
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 520px;
  margin: 0 auto 32px;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary {
  background: var(--ink-yellow);
  color: var(--ink-black);
  border-color: var(--ink-black);
  box-shadow: 3px 3px 0 var(--ink-black);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  background: #ffd54a;
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--ink-black);
}

/* ========== 页脚 ========== */
.site-footer {
  padding: 72px 0 32px;
  background: var(--paper-deep);
  border-top: 3px solid var(--ink-black);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 12px;
  background: repeating-linear-gradient(
    90deg,
    var(--ink-yellow) 0px,
    var(--ink-yellow) 40px,
    var(--ink-red) 40px,
    var(--ink-red) 80px,
    var(--ink-blue) 80px,
    var(--ink-blue) 120px,
    var(--ink-green) 120px,
    var(--ink-green) 160px
  );
  border-bottom: 2px solid var(--ink-black);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand .logo {
  font-size: 1.4rem;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--ink-gray);
  line-height: 1.7;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
  color: var(--ink-red);
  border-bottom: 2px solid rgba(20, 20, 20, 0.2);
  padding-bottom: 10px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul a {
  text-decoration: none;
  color: var(--ink-gray);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s, padding-left 0.2s;
  position: relative;
  padding-left: 0;
}

.footer-col ul a:hover {
  color: var(--ink-red);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 2px solid rgba(20, 20, 20, 0.15);
  margin-top: 56px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--ink-gray);
  font-weight: 500;
}

.footer-bottom a {
  color: var(--ink-red);
  text-decoration: none;
  font-weight: 700;
}

/* ========== 工具类 ========== */
.text-accent {
  color: var(--ink-red);
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 56px;
  opacity: 0.7;
  color: var(--ink-gray);
  line-height: 1.7;
}

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

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

/* ========== 动画关键帧 ========== */
@keyframes slowFloat {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  33% {
    transform: translateY(-18px) rotate(3deg);
  }
  66% {
    transform: translateY(10px) rotate(-2deg);
  }
}

@keyframes fadeSlideDown {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes stampPop {
  0% {
    transform: scale(0.6) rotate(-8deg);
    opacity: 0;
  }
  60% {
    transform: scale(1.06) rotate(2deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

.hero-eyebrow {
  animation: stampPop 0.6s ease 0.1s backwards;
}

.hero h1 {
  animation: stampPop 0.7s ease 0.25s backwards;
}

.hero p {
  animation: stampPop 0.6s ease 0.4s backwards;
}

.hero-buttons {
  animation: stampPop 0.6s ease 0.55s backwards;
}

/* 空状态装饰：为img标签提供占位背景 */
img:not([src]) {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--paper-deep);
  border: none;
  position: relative;
}

img:not([src])::before {
  content: '◫';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: var(--ink-gray);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .feature-block {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .hero {
    min-height: auto;
    padding-top: 120px;
    padding-bottom: 100px;
  }

  .hero::after {
    font-size: 0.7rem;
    padding: 8px 0;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .feature-block {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .feature-image {
    order: -1;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat-item {
    padding: 24px 16px;
  }

  .stat-number {
    font-size: 2.2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .cta-banner {
    padding: 56px 24px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--paper);
    border-bottom: 3px solid var(--ink-black);
    padding: 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    box-shadow: 0 12px 24px rgba(20, 20, 20, 0.08);
  }

  .main-nav.open {
    display: flex;
  }

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

  .nav-cta {
    margin-left: 0;
    margin-top: 8px;
    width: 100%;
    text-align: center;
  }

  .menu-toggle {
    display: block;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-buttons .btn {
    justify-content: center;
  }

  .cards-grid,
  .content-wall {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section-title {
    font-size: 1.8rem;
  }

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

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

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

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }

  .section {
    padding: 56px 0;
  }

  .hero {
    padding-top: 110px;
    padding-bottom: 84px;
  }

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

  .hero p {
    font-size: 0.98rem;
  }

  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    gap: 14px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    padding: 44px 18px;
    border-radius: 8px;
  }

  .cta-banner h2 {
    font-size: 1.5rem;
  }

  .header-inner {
    height: 68px;
  }

  .main-nav {
    top: 68px;
  }

  .logo {
    font-size: 1.05rem;
  }

  .logo-icon {
    width: 34px;
    height: 34px;
    font-size: 0.9rem;
  }

  .btn {
    padding: 12px 22px;
    font-size: 0.88rem;
    width: 100%;
  }

  .feature-block {
    gap: 28px;
  }

  .feature-text h3 {
    font-size: 1.3rem;
  }

  .category-card {
    padding: 24px 20px;
  }

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

  .section-desc {
    font-size: 0.92rem;
    margin-bottom: 32px;
  }

  .hero::before {
    font-size: 120px;
  }

  .hero::after {
    bottom: 0;
    font-size: 0.65rem;
    padding: 6px 0;
  }

  .hero-buttons {
    gap: 10px;
  }
}

/* 聚焦状态提升可访问性 */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--ink-blue);
  outline-offset: 2px;
}

/* 卡片内部标题 */
.category-card h3,
.content-wall-body h3 {
  letter-spacing: -0.01em;
}