/* ============================================
   CleanDNS 公共样式 - 深色科技风
   配色：深蓝黑背景 + 蓝绿渐变强调色
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(25, 35, 55, 0.8);
  --border-glow: rgba(0, 212, 255, 0.15);
  --border-glow-hover: rgba(0, 212, 255, 0.35);
  --accent-start: #00d4ff;
  --accent-end: #0099cc;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --success: #3fb950;
  --danger: #f85149;
  --warning: #d29922;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 背景装饰 - 渐变光晕 */
body::before {
  content: "";
  position: fixed;
  top: -30%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  bottom: -20%;
  right: -10%;
  width: 45vw;
  height: 45vw;
  background: radial-gradient(circle, rgba(0, 153, 204, 0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--accent-start);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: #33ddff;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glow);
}

.navbar .logo {
  font-size: 1.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.navbar .nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.navbar .nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.navbar .nav-links a:hover,
.navbar .nav-links a.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-start);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- 通用容器 ---------- */
.container {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Section 通用 ---------- */
.section {
  padding: 4rem 0;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-desc {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

/* ---------- Hero 区域 ---------- */
.hero {
  text-align: center;
  padding: 5rem 0 3rem;
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 30%, var(--accent-start));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  letter-spacing: 2px;
}

/* ---------- 特性卡片组 ---------- */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.1);
}

.feature-card .icon {
  font-size: 2.4rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ---------- 配置地址区域 ---------- */
.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.2rem;
}

.config-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  gap: 1rem;
  backdrop-filter: blur(8px);
  transition: all var(--transition);
}

.config-item:hover {
  border-color: var(--border-glow-hover);
}

.config-item .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 90px;
}

.config-item .value {
  flex: 1;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.88rem;
  color: var(--accent-start);
  word-break: break-all;
}

.copy-btn {
  flex-shrink: 0;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent-start);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.copy-btn:hover {
  background: rgba(0, 212, 255, 0.2);
  border-color: var(--accent-start);
}

.copy-btn:active {
  transform: scale(0.95);
}

/* ---------- 教程卡片 ---------- */
.tutorial-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.tutorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  backdrop-filter: blur(8px);
  transition: all var(--transition);
}

.tutorial-card:hover {
  border-color: var(--border-glow-hover);
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0, 212, 255, 0.08);
}

.tutorial-card h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tutorial-card ol {
  padding-left: 1.2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.tutorial-card ol li::marker {
  color: var(--accent-start);
}

/* ---------- 原理说明 ---------- */
.principle-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  backdrop-filter: blur(8px);
  line-height: 1.9;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.principle-box strong {
  color: var(--text-primary);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 2rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-stack);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--bg-primary);
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(0, 212, 255, 0.35);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0) scale(0.97);
}

.btn-outline {
  background: transparent;
  color: var(--accent-start);
  border: 1px solid rgba(0, 212, 255, 0.35);
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--accent-start);
}

/* ---------- 检测页 ---------- */
.test-hero {
  text-align: center;
  padding: 4rem 0 2rem;
}

.test-hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.test-hero p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.test-result {
  margin-top: 3rem;
  text-align: center;
}

.test-result .result-box {
  max-width: 500px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  backdrop-filter: blur(8px);
}

.result-box .status-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.result-box .status-text {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.result-box .status-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.result-box.success {
  border-color: rgba(63, 185, 80, 0.3);
}

.result-box.success .status-text {
  color: var(--success);
}

.result-box.fail {
  border-color: rgba(248, 81, 73, 0.3);
}

.result-box.fail .status-text {
  color: var(--danger);
}

/* 检测进度动画 */
.detection-progress {
  margin-top: 3rem;
  text-align: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-glow);
  border-top-color: var(--accent-start);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---------- Toast 提示 ---------- */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-glow-hover);
  color: var(--text-primary);
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 200;
  backdrop-filter: blur(12px);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 2rem 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-glow);
  margin-top: 2rem;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .navbar {
    padding: 0 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .navbar .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(16px);
    padding: 1rem 2rem;
    gap: 0.8rem;
    border-bottom: 1px solid var(--border-glow);
  }

  .navbar .nav-links.open {
    display: flex;
  }

  .navbar .nav-links a {
    border-bottom: none;
    padding: 0.5rem 0;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero .subtitle {
    font-size: 1rem;
    letter-spacing: 1px;
  }

  .section-title {
    font-size: 1.4rem;
  }

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

  .feature-cards,
  .tutorial-cards {
    grid-template-columns: 1fr;
  }

  .config-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .config-item .value {
    width: 100%;
  }

  .copy-btn {
    align-self: flex-end;
  }

  .principle-box {
    padding: 1.5rem;
  }

  .test-hero h1 {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 3rem 0 2rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.9rem;
  }
}