/* ==========================================================================
   赛风 (Saifeng) - 极客级网络对抗与 MPQUIC 传输加速引擎官方落地页
   设计语言：黑曜石深渊冷钛灰 + 赛博电浆高能紫 / 矩阵极光荧光翡翠绿
   ========================================================================== */

:root {
  /* 基础底色系统：黑曜石冷钛深渊 */
  --bg-primary: #07090e;
  --bg-secondary: #0b0f17;
  --bg-tertiary: #101622;
  --bg-surface: #141c2b;
  --bg-card: rgba(16, 22, 35, 0.78);
  --bg-card-hover: rgba(24, 32, 50, 0.9);
  --bg-glass: rgba(12, 16, 24, 0.85);

  /* 主题色系：电浆紫 & 极光翡翠绿 */
  --plasma-violet: #a855f7;
  --plasma-violet-light: #c084fc;
  --plasma-violet-dark: #7e22ce;
  --plasma-glow: rgba(168, 85, 247, 0.4);

  --emerald-green: #10b981;
  --emerald-green-light: #34d399;
  --emerald-green-dark: #047857;
  --emerald-glow: rgba(16, 185, 129, 0.35);

  --cyan-neon: #06b6d4;
  --rose-alert: #f43f5e;
  --amber-warning: #f59e0b;

  /* 文字排版颜色 */
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dark: #334155;

  /* 边框与发丝线 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(148, 163, 184, 0.18);
  --border-violet: rgba(168, 85, 247, 0.35);
  --border-emerald: rgba(16, 185, 129, 0.35);

  /* 字体家族 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 阴影效果 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.7);
  --shadow-violet: 0 0 25px rgba(168, 85, 247, 0.25);
  --shadow-emerald: 0 0 25px rgba(16, 185, 129, 0.25);

  /* 动画过渡 */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: 
    radial-gradient(circle at 15% 10%, rgba(168, 85, 247, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.07) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(6, 182, 212, 0.05) 0%, transparent 50%),
    var(--bg-primary);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* 链接基础样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部公告条 */
.top-notice-bar {
  background: linear-gradient(90deg, rgba(168, 85, 247, 0.15), rgba(16, 185, 129, 0.15));
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.84rem;
  color: var(--text-secondary);
  padding: 8px 0;
  text-align: center;
}

.top-notice-bar .badge {
  display: inline-block;
  background: rgba(16, 185, 129, 0.2);
  color: var(--emerald-green-light);
  border: 1px solid var(--emerald-glow);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 8px;
}

/* 标题系统 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid var(--border-violet);
  color: var(--plasma-violet-light);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-tag.emerald {
  background: rgba(16, 185, 129, 0.12);
  border-color: var(--border-emerald);
  color: var(--emerald-green-light);
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 2.85rem);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.text-gradient-plasma {
  background: linear-gradient(135deg, #f8fafc 30%, var(--plasma-violet-light) 70%, var(--emerald-green-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-emerald {
  background: linear-gradient(135deg, #ffffff 20%, var(--emerald-green-light) 70%, var(--cyan-neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.96rem;
  padding: 12px 26px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--plasma-violet), var(--plasma-violet-dark));
  color: #ffffff;
  box-shadow: 0 4px 20px var(--plasma-glow);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(168, 85, 247, 0.5);
  background: linear-gradient(135deg, var(--plasma-violet-light), var(--plasma-violet));
}

.btn-emerald {
  background: linear-gradient(135deg, var(--emerald-green), var(--emerald-green-dark));
  color: #ffffff;
  box-shadow: 0 4px 20px var(--emerald-glow);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-emerald:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(16, 185, 129, 0.5);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-surface);
  border-color: var(--plasma-violet);
  color: #ffffff;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
  border-radius: 12px;
}

/* 玻璃拟态卡片 */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  border-color: var(--border-violet);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-violet);
}

.glass-card.emerald-accent:hover {
  border-color: var(--border-emerald);
  box-shadow: var(--shadow-emerald);
}

/* 状态药丸与芯片 */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-weight: 550;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.04);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald-green);
  box-shadow: 0 0 10px var(--emerald-green);
  animation: pulse-ring 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

.pulse-dot.violet {
  background-color: var(--plasma-violet);
  box-shadow: 0 0 10px var(--plasma-violet);
}

.pulse-dot.danger {
  background-color: var(--rose-alert);
  box-shadow: 0 0 10px var(--rose-alert);
}

@keyframes pulse-ring {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.85);
  }
}

/* 代码与命令行 */
.mono-terminal {
  font-family: var(--font-mono);
  background: #05070a;
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: 12px;
  padding: 16px 20px;
  color: #38bdf8;
  font-size: 0.88rem;
  overflow-x: auto;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.8);
}

/* 响应式断点 */
@media (max-width: 992px) {
  .section-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .btn-lg {
    padding: 12px 24px;
    font-size: 0.98rem;
  }
}