/* ========== 全局变量（深色主题，默认） ========== */
:root {
  --primary-color: #4CAF50;
  --primary-dark: #43A047;
  --bg-color: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-darker: #12121f;
  --nav-bg: rgba(15, 15, 26, 0.95);
  --footer-bg: #0a0a14;
  --text-primary: #e0e0e0;
  --text-secondary: #888;
  --text-muted: #555;
  --border-color: rgba(255, 255, 255, 0.05);
  --border-light: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

/* ========== 浅色主题（紫色调） ========== */
:root[data-theme="light"] {
  --primary-color: #7c5cbf;
  --primary-dark: #6a4bb0;
  --bg-color: #f3f0f8;
  --bg-card: #ffffff;
  --bg-darker: #e8e2f0;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --footer-bg: #e8e2f0;
  --text-primary: #2d2440;
  --text-secondary: #6b5e85;
  --text-muted: #9a8fb0;
  --border-color: rgba(124, 92, 191, 0.1);
  --border-light: rgba(124, 92, 191, 0.15);
  --shadow: 0 12px 32px rgba(124, 92, 191, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(76, 175, 80, 0.2);
  padding: 0 24px;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .icon {
  font-size: 24px;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-size: 15px;
  color: #aaa;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary-color);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown .dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 8px 0;
  min-width: 180px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  z-index: 200;
}

.nav-dropdown:hover .dropdown-menu {
  display: block;
}

.nav-dropdown .dropdown-menu a {
  display: block;
  padding: 10px 20px;
  color: #ccc;
  font-size: 14px;
}

.nav-dropdown .dropdown-menu a:hover {
  background: rgba(76, 175, 80, 0.1);
  color: var(--primary-color);
}

.nav-download {
  background: var(--primary-color);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.2s;
}

.nav-download:hover {
  background: var(--primary-dark);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

/* ========== 通用 Section ========== */
.section-title {
  font-size: 36px;
  font-weight: 800;
  color: #fff;
  text-align: center;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 16px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 48px;
}

/* ========== 按钮 ========== */
.btn-primary {
  background: var(--primary-color);
  color: #fff;
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(76, 175, 80, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid var(--primary-color);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: rgba(76, 175, 80, 0.1);
}

/* ========== 卡片 ========== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

.card:hover {
  border-color: rgba(76, 175, 80, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

/* ========== 标签 ========== */
.tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 600;
}

.tag-free {
  background: rgba(76, 175, 80, 0.15);
  color: var(--primary-color);
}

.tag-vip {
  background: rgba(255, 193, 7, 0.15);
  color: #FFC107;
}

/* ========== 页脚 ========== */
footer {
  background: var(--footer-bg);
  padding: 40px 24px;
  text-align: center;
  border-top: 1px solid var(--border-color);
}

footer p {
  color: var(--text-muted);
  font-size: 13px;
}

footer a {
  color: var(--primary-color);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid rgba(76, 175, 80, 0.2);
    align-items: flex-start;
  }

  .nav-dropdown .dropdown-menu {
    position: static;
    box-shadow: none;
    display: none;
  }

  .nav-dropdown:hover .dropdown-menu {
    display: block;
    margin-left: 20px;
  }

  .section-title {
    font-size: 28px;
  }
}