/* ===== 717影院 完整样式表 ===== */
/* ===== 设计风格：深蓝影音 + 微光视觉 ===== */

/* ---------- 变量与主题 ---------- */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #eef2f7;
  --bg-card: #ffffff;
  --bg-footer: #0d2137;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --bg-hero: linear-gradient(135deg, #0d2137 0%, #1e3a5f 50%, #2d4a7a 100%);
  --bg-glass: rgba(255, 255, 255, 0.6);
  --bg-glass-dark: rgba(13, 33, 55, 0.6);
  --text-strong: #17202a;
  --text-body: #1f2937;
  --text-sub: #475569;
  --text-footer: #cbd5e1;
  --text-footer-head: #ffffff;
  --accent: #e11d48;
  --accent-dark: #be123c;
  --accent-glow: rgba(225, 29, 72, 0.3);
  --accent-blue: #3b82f6;
  --border-light: rgba(148, 163, 184, 0.2);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.15);
  --btn-text: #ffffff;
  --glass-blur: blur(12px);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --bg-primary: #0b1322;
  --bg-secondary: #111c2e;
  --bg-card: #1e293b;
  --bg-footer: #020617;
  --bg-nav: rgba(11, 19, 34, 0.85);
  --bg-hero: linear-gradient(135deg, #020617 0%, #0f172a 50%, #1e293b 100%);
  --bg-glass: rgba(30, 41, 59, 0.7);
  --text-strong: #f8fafc;
  --text-body: #e2e8f0;
  --text-sub: #94a3b8;
  --text-footer: #94a3b8;
  --text-footer-head: #ffffff;
  --accent: #f43f5e;
  --accent-dark: #e11d48;
  --accent-glow: rgba(244, 63, 94, 0.25);
  --border-light: rgba(148, 163, 184, 0.15);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(244, 63, 94, 0.1);
  --btn-text: #ffffff;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--bg-secondary);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-body);
  font-family: var(--font-main);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::-webkit-scrollbar {
  width: 8px;
}

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

body::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: var(--radius-full);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-strong);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5em;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-strong) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 2.5rem 0 1.2rem;
  position: relative;
  padding-left: 1.2rem;
  overflow: hidden;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 70%;
  background: linear-gradient(180deg, var(--accent), var(--accent-blue));
  border-radius: var(--radius-full);
  box-shadow: 0 0 12px var(--accent-glow);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  margin: 1.2rem 0 0.75rem;
}

h4 {
  font-size: 1.1rem;
  margin: 1rem 0 0.5rem;
  color: var(--text-body);
  font-weight: 600;
}

p {
  color: var(--text-body);
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.8;
}

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

a:hover {
  color: var(--accent-dark);
}

a:not(.btn, .logo)::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

a:not(.btn, .logo):hover::after {
  width: 100%;
}

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

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

strong {
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 容器与布局 ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 3rem 0;
  position: relative;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  padding: 0.8rem 0;
  transition: var(--transition);
}

.navbar:hover {
  box-shadow: var(--shadow-md);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text-strong);
  background: linear-gradient(135deg, var(--accent), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  transition: var(--transition);
  animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { filter: drop-shadow(0 0 2px var(--accent-glow)); }
  50% { filter: drop-shadow(0 0 12px var(--accent-glow)); }
}

.logo span {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-body);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  position: relative;
  transition: var(--transition);
}

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

.nav-links a:hover {
  color: var(--accent);
  background: var(--bg-glass);
}

.nav-links a:hover::before {
  width: 70%;
}

/* ---------- 搜索框 ---------- */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-glass);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

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

.search-box input {
  border: none;
  background: transparent;
  padding: 0.6rem 1rem;
  color: var(--text-body);
  font-size: 0.9rem;
  outline: none;
  width: 160px;
  transition: var(--transition);
}

.search-box input::placeholder {
  color: var(--text-sub);
}

.search-box input:focus {
  width: 200px;
}

.search-box button {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border: none;
  color: var(--btn-text);
  padding: 0.6rem 1.2rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
}

.search-box button:hover {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  transform: scale(1.05);
}

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  background: var(--bg-glass);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 0.5rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-body);
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
}

.theme-toggle::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.theme-toggle:hover::before {
  left: 100%;
}

.theme-toggle:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--accent-glow);
}

/* ---------- Hero 区域 ---------- */
.hero {
  background: var(--bg-hero);
  padding: 4rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 70%;
  height: 200%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.5;
  animation: heroGlow 6s ease-in-out infinite alternate;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 60%;
  height: 150%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
  opacity: 0.4;
  animation: heroGlow 8s ease-in-out infinite alternate-reverse;
}

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

.hero-content {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-text {
  flex: 2;
  min-width: 300px;
}

.hero-text h1 {
  color: #ffffff;
  -webkit-text-fill-color: #ffffff;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  margin-bottom: 1.2rem;
}

.hero-text p {
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.hero-text strong {
  color: #fbbf24;
}

.hero-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #ffffff;
  padding: 0.4rem 1.4rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 20px var(--accent-glow);
  animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.hero .btn {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #1f2937;
  box-shadow: 0 4px 20px rgba(251, 191, 36, 0.4);
}

.hero .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(251, 191, 36, 0.6);
}

.svg-placeholder {
  flex: 1;
  min-width: 250px;
  text-align: center;
  background: var(--bg-glass-dark);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 卡片系统 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2.5rem 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2rem 1.8rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-blue));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

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

.card::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.card:hover::after {
  opacity: 0.3;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.card h3, .card h4 {
  position: relative;
  z-index: 2;
  color: var(--text-strong);
}

.card p {
  position: relative;
  z-index: 2;
  color: var(--text-body);
  font-size: 0.95rem;
}

.card .more {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 600;
  color: var(--accent);
  transition: var(--transition);
}

.card .more:hover {
  transform: translateX(5px);
}

/* ---------- 文章列表 ---------- */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin: 2rem 0;
}

.article-item {
  background: var(--bg-card);
  padding: 1.8rem 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent), var(--accent-blue));
  transition: var(--transition);
}

.article-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.article-item:hover::before {
  width: 6px;
}

.article-item h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  transition: var(--transition);
}

.article-item:hover h4 {
  color: var(--accent);
}

.article-item .more {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
  transition: var(--transition);
}

.meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px dashed var(--border-light);
}

.meta span {
  font-size: 0.85rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.meta span::before {
  content: "•";
  color: var(--accent);
}

.meta span:first-child::before {
  content: "📅";
}

.meta span:nth-child(2)::before {
  content: "✍️";
}

/* ---------- FAQ 手风琴 ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-list details {
  background: var(--bg-card);
  padding: 1.5rem 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.faq-list details::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent), var(--accent-blue));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.faq-list details:hover,
.faq-list details[open] {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.faq-list details[open]::before {
  opacity: 1;
}

.faq-list summary {
  font-weight: 600;
  color: var(--text-strong);
  cursor: pointer;
  font-size: 1.05rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: var(--transition);
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "＋";
  font-size: 1.5rem;
  color: var(--accent);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

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

.faq-list p {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-light);
  color: var(--text-body);
}

/* ---------- 步骤列表 ---------- */
.step-list {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}

.step-list h4 {
  color: var(--accent);
  margin-top: 0;
}

.step-list ol,
.step-list ul {
  padding-left: 1.8rem;
  margin: 1rem 0;
}

.step-list li {
  padding: 0.5rem 0;
  position: relative;
  transition: var(--transition);
}

.step-list li:hover {
  transform: translateX(5px);
  color: var(--accent);
}

.step-list ol li::marker {
  color: var(--accent);
  font-weight: bold;
}

.step-list ul li::marker {
  color: var(--accent-blue);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--btn-text);
  padding: 0.8rem 2rem;
  border-radius: var(--radius-full);
  border: none;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  text-align: center;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--accent-glow);
  color: #ffffff;
}

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

/* ---------- 页脚 ---------- */
footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-blue), var(--accent));
  background-size: 200% 100%;
  animation: gradientMove 3s linear infinite;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

footer h4 {
  color: var(--text-footer-head);
  font-size: 1.1rem;
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

footer h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent);
}

footer a {
  color: #93c5fd;
  transition: var(--transition);
  position: relative;
}

footer a:hover {
  color: #ffffff;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-grid > div {
  position: relative;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}

.footer-grid > div:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  position: relative;
}

.copyright p {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 0.3rem;
}

.copyright p:last-child {
  color: #fbbf24;
  opacity: 1;
}

/* ---------- 返回顶部按钮 ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #ffffff;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: var(--transition);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

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

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px var(--accent-glow);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 4px 20px var(--accent-glow); }
  50% { box-shadow: 0 8px 40px var(--accent-glow); }
}

/* ---------- 滚动动画 ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.card, .article-item, .faq-list details {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.card:nth-child(2), .article-item:nth-child(2), .faq-list details:nth-child(2) {
  animation-delay: 0.1s;
}

.card:nth-child(3), .article-item:nth-child(3), .faq-list details:nth-child(3) {
  animation-delay: 0.2s;
}

.card:nth-child(4), .article-item:nth-child(4), .faq-list details:nth-child(4) {
  animation-delay: 0.3s;
}

.card:nth-child(5), .article-item:nth-child(5), .faq-list details:nth-child(5) {
  animation-delay: 0.4s;
}

.card:nth-child(6), .article-item:nth-child(6), .faq-list details:nth-child(6) {
  animation-delay: 0.5s;
}

/* ---------- 背景渐变装饰 ---------- */
section:nth-of-type(odd) {
  background: linear-gradient(180deg, transparent, var(--bg-secondary), transparent);
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }
  
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .search-box input {
    width: 130px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  
  .container {
    padding: 0 16px;
  }
  
  section {
    padding: 2rem 0;
  }
  
  h1 {
    font-size: 1.8rem;
  }
  
  h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
  }
  
  .nav-wrap {
    flex-direction: column;
    gap: 1rem;
    padding: 0.5rem 0;
  }
  
  .logo {
    font-size: 1.6rem;
  }
  
  .nav-links {
    justify-content: center;
    gap: 0.8rem;
    width: 100%;
  }
  
  .nav-links a {
    font-size: 0.85rem;
    padding: 0.3rem 0.5rem;
  }
  
  .search-box {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
  }
  
  .search-box input {
    flex: 1;
    width: auto;
  }
  
  .search-box input:focus {
    width: auto;
  }
  
  .hero {
    padding: 3rem 0 4rem;
  }
  
  .hero-content {
    flex-direction: column;
    gap: 2rem;
  }
  
  .hero-text {
    text-align: center;
  }
  
  .hero-text p {
    font-size: 1rem;
  }
  
  .hero-badge {
    margin-bottom: 1rem;
  }
  
  .svg-placeholder {
    min-width: 200px;
    max-width: 300px;
    margin: 0 auto;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .article-item {
    padding: 1.2rem;
  }
  
  .faq-list details {
    padding: 1.2rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  h2 {
    font-size: 1.3rem;
  }
  
  .nav-links {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .nav-links a {
    font-size: 0.8rem;
  }
  
  .search-box button {
    padding: 0.5rem 0.8rem;
  }
  
  .card-grid {
    gap: 1rem;
  }
  
  .card {
    padding: 1.2rem;
  }
  
  .meta {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .footer-grid {
    gap: 1rem;
  }
  
  .footer-grid > div {
    padding: 0.8rem;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .navbar,
  .back-to-top,
  .theme-toggle,
  .search-box {
    display: none !important;
  }
  
  body {
    background: #ffffff;
    color: #000000;
  }
  
  .card,
  .article-item,
  .faq-list details {
    break-inside: avoid;
    opacity: 1 !important;
    animation: none !important;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ---------- 焦点可见性 ---------- */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 高对比度支持 ---------- */
@media (prefers-contrast: high) {
  :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f0f0f0;
    --text-strong: #000000;
    --text-body: #000000;
    --text-sub: #000000;
    --border-light: #000000;
  }
  
  .card,
  .article-item,
  .faq-list details {
    border-width: 2px;
  }
}

/* ---------- 渐变文字辅助 ---------- */
.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- 毛玻璃工具类 ---------- */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ---------- 动画工具类 ---------- */
.animate-float {
  animation: float 4s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-shimmer {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
}

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

/* ---------- 响应式字体优化 ---------- */
@media (min-width: 1440px) {
  .container {
    padding: 0 32px;
  }
  
  body {
    font-size: 17px;
  }
}

/* ---------- 移动端触摸优化 ---------- */
@media (hover: none) {
  .card:hover,
  .article-item:hover,
  .faq-list details:hover {
    transform: none;
  }
  
  .btn,
  .theme-toggle,
  .search-box button {
    -webkit-tap-highlight-color: transparent;
  }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
}

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

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
}

/* ---------- 选中文本样式 ---------- */
::selection {
  background: var(--accent);
  color: #ffffff;
}

/* ---------- 表格与列表优化 ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

th,
td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-strong);
}

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

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

/* ---------- 分割线 ---------- */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-light), transparent);
  margin: 3rem 0;
}

/* ---------- 引用块 ---------- */
blockquote {
  border-left: 4px solid var(--accent);
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: italic;
}

/* ---------- 代码块 ---------- */
code {
  background: var(--bg-secondary);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-family: "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
}

pre {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
}

pre code {
  background: transparent;
  padding: 0;
}

/* ---------- 工具提示 ---------- */
[data-tooltip] {
  position: relative;
}

[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-strong);
  color: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  white-space: nowrap;
  z-index: 10;
  box-shadow: var(--shadow-md);
}

/* ---------- 表单控件 ---------- */
input,
select,
textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-body);
  transition: var(--transition);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* 确保所有内容在暗色模式下清晰可读 */
[data-theme="dark"] .card,
[data-theme="dark"] .article-item,
[data-theme="dark"] .faq-list details {
  background: var(--bg-card);
  border-color: var(--border-light);
}

[data-theme="dark"] .hero-text h1 {
  -webkit-text-fill-color: #ffffff;
}

[data-theme="dark"] .hero-text p {
  color: rgba(255, 255, 255, 0.85);
}

/* 响应式图片处理 */
.img-responsive {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

/* 安全区域适配 */
@supports (padding: max(0px)) {
  .navbar {
    padding-top: max(0.8rem, env(safe-area-inset-top));
  }
  
  .back-to-top {
    bottom: max(30px, env(safe-area-inset-bottom));
  }
  
  footer {
    padding-bottom: max(2rem, env(safe-area-inset-bottom));
  }
}