/* ─── unobox Premium Design System — 静态官网公共样式 ─── */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  /* HSL 调色系统 */
  --bg-base: #0a0f18;
  --bg-surface: rgba(18, 26, 42, 0.6);
  --bg-surface-hover: rgba(26, 38, 60, 0.8);
  --border-color: rgba(255, 255, 255, 0.07);
  --border-glow: rgba(51, 144, 236, 0.2);

  /* 经典 Telegram 蓝渐变 */
  --primary: #3390ec;
  --primary-glow: rgba(51, 144, 236, 0.4);
  --primary-gradient: linear-gradient(135deg, #3390ec 0%, #1a73e8 100%);
  --accent-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);

  /* 文字 */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;

  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  line-height: 1.6;
}

/* 背景酷炫流光粒子发光效果 */
.bg-glow-1 {
  position: fixed;
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(51, 144, 236, 0.15) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  animation: float-glow 20s infinite alternate;
}

.bg-glow-2 {
  position: fixed;
  bottom: -10%;
  right: -10%;
  width: 40vw;
  height: 40vw;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  animation: float-glow 25s infinite alternate-reverse;
}

@keyframes float-glow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(10%, 8%) scale(1.2); }
}

/* 导航栏 (Glassmorphism) */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 16px 40px;
  background: rgba(10, 15, 24, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  transition: var(--transition-smooth);
}

.navbar-brand {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(90deg, #fff, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition-smooth);
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: var(--transition-smooth);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* Premium 按钮 */
.btn-nav-download {
  background: var(--primary-gradient);
  color: #fff;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 4px 14px var(--primary-glow);
  transition: var(--transition-smooth);
}

.btn-nav-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(51, 144, 236, 0.6);
}

/* Hero Section */
.hero {
  padding: 160px 40px 100px;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge-version {
  background: rgba(51, 144, 236, 0.1);
  border: 1px solid var(--primary-glow);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 24px;
  animation: pulse-border 2s infinite;
}

@keyframes pulse-border {
  0%, 100% { box-shadow: 0 0 0 0 rgba(51, 144, 236, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(51, 144, 236, 0); }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 20px 0;
  letter-spacing: -1.5px;
  background: linear-gradient(180deg, #ffffff 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 0 40px 0;
  font-weight: 400;
}

/* 毛玻璃容器卡片 */
.glass-card {
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-premium);
  transition: var(--transition-smooth);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: 0 12px 40px rgba(51, 144, 236, 0.15);
}

/* 巨幅下载面板 */
.download-hero-card {
  padding: 40px;
  width: 100%;
  max-width: 700px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 80px;
}

.download-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  font-family: var(--font-display);
}

.btn-primary-lg {
  background: var(--primary-gradient);
  color: #fff;
  padding: 16px 36px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  box-shadow: 0 8px 24px var(--primary-glow);
  transition: var(--transition-smooth);
  border: none;
  cursor: pointer;
}

.btn-primary-lg:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 32px rgba(51, 144, 236, 0.7);
}

.download-meta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  justify-content: center;
  gap: 20px;
}

/* 特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1200px;
  width: 100%;
  padding: 0 40px 100px;
  margin: 0 auto;
}

.feature-item {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(51, 144, 236, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 24px;
}

.feature-item h3 {
  margin: 0;
  font-size: 20px;
  font-family: var(--font-display);
  font-weight: 700;
}

.feature-item p {
  margin: 0;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 教程页面样式 */
.container-narrow {
  max-width: 800px;
  margin: 140px auto 100px;
  padding: 0 24px;
}

.step-card {
  padding: 32px;
  margin-bottom: 32px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  text-align: left;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: 0 4px 10px var(--primary-glow);
}

.step-content h3 {
  margin: 0 0 10px 0;
  font-size: 20px;
  font-family: var(--font-display);
  font-weight: 700;
}

.step-content p {
  margin: 0 0 16px 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.terminal-box {
  background: #05070c;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-family: 'Courier New', Courier, monospace;
  color: #00f2fe;
  font-size: 14px;
  overflow-x: auto;
  user-select: all;
}

/* 版本日志页面样式 */
.changelog-timeline {
  display: flex;
  flex-direction: column;
  gap: 40px;
  position: relative;
  text-align: left;
  padding-left: 20px;
}

.changelog-timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 4px;
  bottom: 10px;
  width: 2px;
  background: var(--border-color);
}

.changelog-card {
  padding: 32px;
  position: relative;
}

.changelog-card::before {
  content: '';
  position: absolute;
  top: 38px;
  left: -21px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 4px solid var(--bg-base);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.changelog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.changelog-version {
  font-size: 22px;
  font-weight: 800;
  font-family: var(--font-display);
  color: var(--primary);
  margin: 0;
}

.changelog-date {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.changelog-body {
  font-size: 15px;
  color: var(--text-secondary);
}

.changelog-body ul {
  margin: 10px 0;
  padding-left: 20px;
}

.changelog-body li {
  margin-bottom: 8px;
}

.changelog-body h3 {
  font-size: 16px;
  color: var(--text-primary);
  margin: 20px 0 10px 0;
}

/* 底部声明 */
.footer {
  text-align: center;
  padding: 60px 40px;
  color: var(--text-muted);
  font-size: 14px;
  border-top: 1px solid var(--border-color);
  background: rgba(5, 7, 12, 0.4);
}

/* 移动端适配 */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .navbar {
    padding: 16px 20px;
  }
  .hero h1 {
    font-size: 42px;
  }
}