/* ===== 91av视频 全站样式 ===== */
:root {
  --bg: #f8f6f2;
  --surface: rgba(255,255,255,0.85);
  --surface-solid: #ffffff;
  --text-primary: #2d2a26;
  --text-secondary: #5c564d;
  --text-heading: #1f1c18;
  --border-color: #e8e2d8;
  --accent: #c8553d;
  --accent-soft: rgba(200,85,61,0.12);
  --accent-contrast: #ffffff;
  --nav-bg: rgba(255,255,255,0.8);
  --footer-bg: #1f1c18;
  --footer-text: #e8e2d8;
  --card-bg: rgba(255,255,255,0.82);
  --hover-bg: rgba(200,85,61,0.08);
  --btn-bg: #c8553d;
  --btn-text: #ffffff;
  --btn-hover: #a9442f;
  --shadow-sm: 0 2px 8px rgba(31,28,24,0.06);
  --shadow-md: 0 6px 20px rgba(31,28,24,0.08);
  --shadow-lg: 0 12px 32px rgba(31,28,24,0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --max-width: 1200px;
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --blur-bg: rgba(255,255,255,0.6);
}

[data-theme="dark"] {
  --bg: #141210;
  --surface: rgba(30,27,24,0.85);
  --surface-solid: #1e1b18;
  --text-primary: #e8e2d8;
  --text-secondary: #b8b0a4;
  --text-heading: #f5f1ea;
  --border-color: #3a352e;
  --accent: #e0705a;
  --accent-soft: rgba(224,112,90,0.16);
  --accent-contrast: #ffffff;
  --nav-bg: rgba(30,27,24,0.85);
  --footer-bg: #0f0e0c;
  --footer-text: #c8c0b4;
  --card-bg: rgba(30,27,24,0.82);
  --hover-bg: rgba(224,112,90,0.12);
  --btn-bg: #e0705a;
  --btn-hover: #c8553d;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  --blur-bg: rgba(30,27,24,0.6);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg);
  background-image: radial-gradient(circle at 15% 10%, rgba(200,85,61,0.06) 0%, transparent 40%), radial-gradient(circle at 85% 80%, rgba(200,85,61,0.04) 0%, transparent 35%);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

a:hover {
  color: var(--btn-hover);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 1rem;
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 3rem 0 1.2rem;
  padding-left: 1.2rem;
  border-left: 6px solid var(--accent);
  position: relative;
}

h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 40px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  opacity: 0.4;
}

h3 {
  font-size: 1.3rem;
  margin: 1.8rem 0 0.8rem;
  font-weight: 600;
}

h4 {
  font-size: 1.1rem;
  margin: 1.2rem 0 0.6rem;
  color: var(--text-heading);
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-weight: 400;
}

ul, ol {
  color: var(--text-primary);
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.4rem;
}

blockquote {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-secondary);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== 毛玻璃通用类 ===== */
.glass {
  background: var(--blur-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255,255,255,0.2);
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(24px) saturate(200%);
  -webkit-backdrop-filter: blur(24px) saturate(200%);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.logo a {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-heading);
  text-decoration: none;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent), #d4a574);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 0.2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 30px;
  transition: var(--transition);
  position: relative;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--accent);
  background: var(--hover-bg);
  text-decoration: none;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 60%;
}

.nav-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.theme-toggle, .menu-toggle {
  background: var(--surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 1rem;
  border-radius: 30px;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.theme-toggle:hover, .menu-toggle:hover {
  background: var(--hover-bg);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 0.2rem 0.3rem 0.2rem 0.8rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.5rem 0.6rem;
  color: var(--text-primary);
  width: 140px;
  outline: none;
  font-size: 0.9rem;
  transition: width 0.3s ease;
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-box input:focus {
  width: 170px;
}

.search-box button {
  background: var(--accent);
  border: none;
  color: white;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 0.9rem;
  flex-shrink: 0;
}

.search-box button:hover {
  background: var(--btn-hover);
  transform: scale(1.08);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  background: var(--nav-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  padding: 1rem 1.5rem;
  gap: 0.5rem;
  border-top: 1px solid var(--border-color);
  animation: slideDown 0.3s ease;
}

.mobile-menu a {
  color: var(--text-primary);
  font-size: 1.1rem;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-menu a:hover {
  background: var(--hover-bg);
  color: var(--accent);
  text-decoration: none;
  padding-left: 1.2rem;
}

.menu-toggle {
  display: none;
}

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

/* ===== Hero Banner ===== */
.banner {
  background: linear-gradient(135deg, #2d1b14 0%, #5a2e22 30%, #c8553d 70%, #e0705a 100%);
  color: white;
  padding: 4rem 1.5rem;
  border-radius: 0 0 40px 40px;
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(255,255,255,0.15) 0%, transparent 50%), radial-gradient(circle at 20% 80%, rgba(255,255,255,0.08) 0%, transparent 40%);
  z-index: -1;
}

.banner::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
  top: -100px;
  right: -100px;
  z-index: -1;
  animation: float 8s ease-in-out infinite;
}

.banner h1 {
  color: white;
  font-size: clamp(2rem, 5vw, 3rem);
  text-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  margin-bottom: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.banner p {
  color: rgba(255,255,255,0.92);
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 700px;
  text-shadow: 1px 1px 4px rgba(0,0,0,0.15);
  line-height: 1.8;
}

.banner .btn {
  background: rgba(255,255,255,0.95);
  color: var(--accent);
  padding: 0.8rem 2.2rem;
  border-radius: 50px;
  font-weight: 700;
  display: inline-block;
  margin-top: 1.5rem;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.banner .btn:hover {
  background: white;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  text-decoration: none;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-20px, 20px) scale(1.1);
  }
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.8rem;
  margin: 2rem 0;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 0;
  color: var(--text-heading);
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
}

.card h4 {
  color: var(--text-heading);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.card p {
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card .meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--border-color);
  font-weight: 400;
}

.card a {
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: var(--transition);
}

.card a::after {
  content: '→';
  transition: transform 0.3s ease;
}

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

/* ===== 表格 ===== */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.5rem 0;
  background: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

th {
  background: linear-gradient(135deg, var(--accent), #d47a5a);
  color: white;
  padding: 1rem 1.2rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

td {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: var(--hover-bg);
}

/* ===== FAQ 手风琴 ===== */
details {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1rem 1.4rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 0.8rem;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

details:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

details[open] {
  border-color: var(--accent);
  background: var(--card-bg);
}

summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--text-heading);
  font-size: 1rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: var(--transition);
  padding: 0.3rem 0;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--accent);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  line-height: 1;
}

details[open] summary::after {
  transform: rotate(45deg);
}

summary:hover {
  color: var(--accent);
}

details p {
  margin-top: 0.8rem;
  color: var(--text-primary);
  padding-top: 0.8rem;
  border-top: 1px dashed var(--border-color);
  font-size: 0.95rem;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 按钮 ===== */
.btn {
  background: linear-gradient(135deg, var(--btn-bg), #d47a5a);
  color: var(--btn-text);
  padding: 0.7rem 1.8rem;
  border-radius: 50px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  box-shadow: 0 4px 12px rgba(200,85,61,0.3);
  letter-spacing: 0.01em;
}

.btn:hover {
  background: linear-gradient(135deg, var(--btn-hover), #c8553d);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(200,85,61,0.4);
  text-decoration: none;
  color: white;
}

.btn:active {
  transform: translateY(-1px);
}

/* ===== Footer ===== */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 3.5rem 0 0;
  margin-top: 4rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent, var(--accent));
  opacity: 0.3;
}

footer a {
  color: #d4a574;
  transition: var(--transition);
}

footer a:hover {
  color: white;
  text-decoration: underline;
}

footer .footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  padding-bottom: 2rem;
}

footer h4 {
  color: #f5f1ea;
  margin-bottom: 1rem;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

footer p {
  color: var(--footer-text);
  font-size: 0.95rem;
  line-height: 1.8;
}

.copyright {
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 1rem;
  padding: 1.5rem 1rem;
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
}

.copyright p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
}

/* ===== 返回顶部 ===== */
.back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--accent), #d47a5a);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(200,85,61,0.4);
  border: none;
  z-index: 999;
  font-size: 1.3rem;
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 8px 24px rgba(200,85,61,0.5);
  background: var(--btn-hover);
}

/* ===== SVG 装饰 ===== */
.svg-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1rem 0;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.svg-img:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-lg);
}

.svg-placeholder {
  background: linear-gradient(135deg, var(--border-color), var(--surface));
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 卡片延迟动画 */
.card-grid .card:nth-child(1) { transition-delay: 0.05s; }
.card-grid .card:nth-child(2) { transition-delay: 0.1s; }
.card-grid .card:nth-child(3) { transition-delay: 0.15s; }
.card-grid .card:nth-child(4) { transition-delay: 0.2s; }
.card-grid .card:nth-child(5) { transition-delay: 0.25s; }
.card-grid .card:nth-child(6) { transition-delay: 0.3s; }

/* ===== 文章卡片特殊样式 ===== */
article.card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

article.card h4 {
  font-size: 1rem;
  line-height: 1.5;
  min-height: 3em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

article.card p {
  font-size: 0.9rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== HOWTO 区块 ===== */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  counter-increment: step;
  padding: 0.8rem 1rem 0.8rem 3.5rem;
  position: relative;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 0.6rem;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#howto ol li:hover {
  border-color: var(--accent);
  transform: translateX(5px);
  box-shadow: var(--shadow-sm);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent), #d47a5a);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

/* ===== 联系我们 ===== */
#contact p {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  font-size: 0.98rem;
}

#contact p::before {
  content: '▸';
  color: var(--accent);
  font-size: 1.1rem;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 1.2rem;
  }
  
  .nav-links {
    gap: 0.1rem;
  }
  
  .nav-links a {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
  
  h2 {
    font-size: 1.7rem;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  
  .nav-links {
    display: none;
  }
  
  .nav-inner {
    padding: 0.7rem 1rem;
    gap: 0.5rem;
  }
  
  .menu-toggle {
    display: inline-flex;
  }
  
  .mobile-menu.active {
    display: flex;
    width: 100%;
  }
  
  .search-box {
    order: 3;
    width: 100%;
    margin-top: 0.5rem;
  }
  
  .search-box input,
  .search-box input:focus {
    width: 100%;
  }
  
  .banner {
    padding: 3rem 1.2rem;
    border-radius: 0 0 30px 30px;
  }
  
  .banner h1 {
    font-size: 1.8rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  
  h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
  }
  
  .back-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }
  
  footer {
    padding: 2.5rem 0 0;
  }
  
  .footer-grid {
    gap: 1.5rem;
    padding: 0 1rem 1.5rem;
  }
  
  .nav-actions {
    gap: 0.4rem;
  }
  
  .theme-toggle {
    padding: 0.4rem 0.7rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .banner {
    padding: 2.5rem 1rem;
  }
  
  .banner .btn {
    padding: 0.7rem 1.6rem;
    font-size: 0.9rem;
  }
  
  .card {
    padding: 1.4rem;
  }
  
  h1 {
    font-size: 1.6rem;
  }
  
  h2 {
    font-size: 1.3rem;
    padding-left: 0.8rem;
  }
  
  .search-box input {
    width: 100px;
  }
  
  .search-box input:focus {
    width: 130px;
  }
  
  .nav-actions {
    flex-wrap: wrap;
  }
  
  .theme-toggle, .menu-toggle {
    font-size: 0.9rem;
    padding: 0.35rem 0.6rem;
  }
}

/* ===== 打印优化 ===== */
@media print {
  .navbar, .back-top, .banner .btn, .theme-toggle, .menu-toggle, .search-box {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card, details {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
}

/* ===== 无障碍 ===== */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: var(--accent);
  color: white;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--accent), #d4a574);
  border-radius: 10px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--btn-hover);
}

/* ===== 暗色模式额外优化 ===== */
[data-theme="dark"] .search-box input::placeholder {
  color: #8a8278;
}

[data-theme="dark"] .banner {
  background: linear-gradient(135deg, #1a1210 0%, #3d221a 30%, #8a3d2c 70%, #b5533f 100%);
}

[data-theme="dark"] .banner .btn {
  background: rgba(255,255,255,0.9);
  color: #2d1b14;
}

[data-theme="dark"] .banner .btn:hover {
  background: white;
}

[data-theme="dark"] .logo a {
  background: linear-gradient(135deg, #e0705a, #f0a878);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===== 高对比度模式 ===== */
@media (prefers-contrast: more) {
  :root {
    --border-color: #999;
    --text-secondary: #1a1a1a;
  }
  
  [data-theme="dark"] {
    --border-color: #666;
    --text-secondary: #ccc;
  }
}

/* ===== 减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .reveal {
    opacity: 1;
    transform: none;
  }
}