/* =============================================
   🔷 纸盒人网站 — 深色赛博科技设计系统
   ============================================= */

/* --- 字体 --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS 变量（设计令牌） --- */
:root {
  /* 主色调 */
  --primary: #00d4ff;
  --primary-dim: #0099bb;
  --secondary: #7c3aed;
  --secondary-dim: #5b21b6;
  --accent: #22d3ee;
  --accent-dim: #0891b2;

  /* 背景层级 */
  --bg-deep: #060b18;
  --bg-main: #0a0f1e;
  --bg-elevated: #111827;
  --bg-card: rgba(15, 23, 42, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-strong: rgba(255, 255, 255, 0.08);

  /* 边框 */
  --border-glass: rgba(0, 212, 255, 0.12);
  --border-glass-hover: rgba(0, 212, 255, 0.3);
  --border-subtle: rgba(255, 255, 255, 0.06);

  /* 文本 */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #00d4ff;

  /* 阴影 */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 60px rgba(0, 212, 255, 0.03);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.15), 0 0 60px rgba(0, 212, 255, 0.05);
  --shadow-glow-purple: 0 0 20px rgba(124, 58, 237, 0.15), 0 0 60px rgba(124, 58, 237, 0.05);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #00d4ff, #7c3aed);
  --gradient-bg: linear-gradient(160deg, #060b18 0%, #0a0f1e 40%, #111827 70%, #0a0f1e 100%);
  --gradient-card: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(124, 58, 237, 0.05));

  /* 动画 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 亮色科技主题（通过 data-theme="light" 切换） ===== */
[data-theme="light"] {
  --primary: #2563eb;
  --primary-dim: #1d4ed8;
  --secondary: #7c3aed;
  --secondary-dim: #6d28d9;
  --accent: #0891b2;
  --accent-dim: #0e7490;

  --bg-deep: #f1f5f9;
  --bg-main: #ffffff;
  --bg-elevated: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(0, 0, 0, 0.03);
  --bg-glass-strong: rgba(0, 0, 0, 0.06);

  --border-glass: rgba(0, 0, 0, 0.08);
  --border-glass-hover: rgba(37, 99, 235, 0.3);
  --border-subtle: rgba(0, 0, 0, 0.06);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-accent: #2563eb;

  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 16px rgba(37, 99, 235, 0.12);
  --shadow-glow-purple: 0 0 16px rgba(124, 58, 237, 0.12);

  --gradient-primary: linear-gradient(135deg, #2563eb, #7c3aed);
  --gradient-bg: linear-gradient(160deg, #f8fafc 0%, #ffffff 40%, #f1f5f9 70%, #ffffff 100%);
  --gradient-card: linear-gradient(135deg, rgba(37, 99, 235, 0.04), rgba(124, 58, 237, 0.04));
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--gradient-bg);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* --- 背景网格叠加层 --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

/* --- 浮动光斑（左上/右下） --- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

body::after {
  background:
    radial-gradient(ellipse 600px 400px at 10% 15%, rgba(0, 212, 255, 0.06), transparent 70%),
    radial-gradient(ellipse 500px 500px at 85% 80%, rgba(124, 58, 237, 0.06), transparent 70%),
    radial-gradient(ellipse 300px 300px at 50% 50%, rgba(34, 211, 238, 0.03), transparent 70%);
}

/* --- 浮动粒子（用多个径向渐变模拟细粒子感） --- */
.bg-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(0, 212, 255, 0.4), transparent),
    radial-gradient(1px 1px at 30% 60%, rgba(124, 58, 237, 0.3), transparent),
    radial-gradient(1px 1px at 50% 10%, rgba(0, 212, 255, 0.3), transparent),
    radial-gradient(1px 1px at 70% 40%, rgba(34, 211, 238, 0.3), transparent),
    radial-gradient(1px 1px at 90% 70%, rgba(124, 58, 237, 0.4), transparent),
    radial-gradient(1px 1px at 20% 85%, rgba(0, 212, 255, 0.2), transparent),
    radial-gradient(1px 1px at 60% 90%, rgba(34, 211, 238, 0.3), transparent),
    radial-gradient(1.5px 1.5px at 40% 30%, rgba(0, 212, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 80% 15%, rgba(124, 58, 237, 0.3), transparent),
    radial-gradient(1px 1px at 15% 50%, rgba(34, 211, 238, 0.2), transparent);
}

/* --- 所有内容在 z-index 层之上 --- */
main, header, footer {
  position: relative;
  z-index: 1;
}

/* =============================================
   导航栏 — 悬浮毛玻璃
   ============================================= */
.glass-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(6, 11, 24, 0.5);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.glass-nav.scrolled {
  background: rgba(6, 11, 24, 0.8);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3), 0 0 20px rgba(0, 212, 255, 0.05);
  border-bottom-color: rgba(0, 212, 255, 0.2);
}

.glass-nav .nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.glass-nav .logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.glass-nav .logo:hover {
  filter: brightness(1.2);
}

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

.glass-nav .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

.glass-nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
  border-radius: 2px;
}

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

.glass-nav .nav-links a:hover::after {
  width: 100%;
}

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

.glass-nav .nav-links a.active::after {
  width: 100%;
}

/* 导航移动端菜单按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition-fast);
}

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

/* 移动端菜单面板 */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: none;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-menu-overlay.open {
  display: block;
  opacity: 1;
}

.mobile-menu-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: rgba(10, 15, 30, 0.95);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-glass);
  z-index: 201;
  padding: 32px 24px;
  transform: translateX(100%);
  transition: transform var(--transition-base);
  display: flex;
  flex-direction: column;
}

.mobile-menu-panel.open {
  transform: translateX(0);
}

.mobile-menu-close {
  align-self: flex-end;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  transition: color var(--transition-fast);
  margin-bottom: 24px;
}

.mobile-menu-close:hover {
  color: var(--primary);
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-menu-links a {
  display: block;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-menu-links a:hover,
.mobile-menu-links a.active {
  background: var(--bg-glass-strong);
  color: var(--primary);
}

/* =============================================
   玻璃卡片系统
   ============================================= */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.3), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.glass-card:hover::before {
  opacity: 1;
}

.glass-card-strong {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}

.glass-card-strong:hover {
  transform: translateY(-4px);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* =============================================
   按钮系统
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.35);
}

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

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--border-glass-hover);
}

.btn-ghost:hover {
  background: var(--bg-glass-strong);
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
  transform: translateY(-2px);
}

.btn-ghost-purple {
  background: transparent;
  color: var(--secondary);
  border: 1px solid rgba(124, 58, 237, 0.3);
}

.btn-ghost-purple:hover {
  background: var(--bg-glass-strong);
  border-color: var(--secondary);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.15);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* =============================================
   标签 / Badge / 技能标签
   ============================================= */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(0, 212, 255, 0.08);
}

.tag-primary {
  border-color: rgba(0, 212, 255, 0.3);
  color: var(--primary);
  background: rgba(0, 212, 255, 0.08);
}

.tag-purple {
  border-color: rgba(124, 58, 237, 0.3);
  color: var(--secondary);
  background: rgba(124, 58, 237, 0.08);
}

.tag-accent {
  border-color: rgba(34, 211, 238, 0.3);
  color: var(--accent);
  background: rgba(34, 211, 238, 0.08);
}

/* =============================================
   渐变色文本
   ============================================= */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-vertical {
  background: linear-gradient(180deg, #00d4ff, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* =============================================
   发光分隔线
   ============================================= */
.glow-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.3), rgba(124, 58, 237, 0.3), transparent);
  margin: 64px auto;
  max-width: 600px;
}

/* =============================================
   动画 - 进入视口
   ============================================= */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
}

/* 动效延迟工具类 */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }

/* =============================================
   工具页面通用容器
   ============================================= */
.tool-page {
  padding-top: 96px;
  padding-bottom: 80px;
  min-height: 100vh;
}

.tool-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

.tool-header {
  text-align: center;
  margin-bottom: 48px;
}

.tool-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.tool-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* =============================================
   表单控件（暗色风格）
   ============================================= */
input[type="text"],
input[type="search"],
textarea,
select {
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 12px 16px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

input[type="text"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

input[type="text"]::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  padding: 40px 24px;
  text-align: center;
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 1;
}

.site-footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer .footer-heart {
  color: var(--primary);
}

/* =============================================
   滚动条
   ============================================= */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(0, 212, 255, 0.2);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 212, 255, 0.4);
}

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

  .nav-toggle {
    display: block;
  }

  .glass-nav .nav-inner {
    padding: 0 16px;
    height: 56px;
  }

  .glass-nav .logo {
    font-size: 1.25rem;
  }

  .tool-header h1 {
    font-size: 1.8rem;
  }

  .tool-container {
    padding: 0 16px;
  }
}

@media (min-width: 769px) {
  .mobile-menu-overlay,
  .mobile-menu-panel {
    display: none !important;
  }
}

/* =============================================
   亮色主题 — 元素覆盖
   ============================================= */
[data-theme="light"] body::before { opacity: 0; }
[data-theme="light"] body::after { opacity: 0; }
[data-theme="light"] .bg-particles { opacity: 0 !important; }

[data-theme="light"] .glass-nav {
  background: rgba(255, 255, 255, 0.6);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}
[data-theme="light"] .glass-nav.scrolled {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  border-bottom-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .mobile-menu-overlay {
  background: rgba(0, 0, 0, 0.3);
}
[data-theme="light"] .mobile-menu-panel {
  background: rgba(255, 255, 255, 0.98);
  border-left-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .glass-card::before {
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.15), transparent);
}
[data-theme="light"] .glass-card:hover {
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

[data-theme="light"] .glow-divider {
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.2), rgba(124, 58, 237, 0.2), transparent);
}

[data-theme="light"] .btn-primary {
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.15);
}
[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.25);
}

[data-theme="light"] .btn-ghost:hover {
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.1);
}

[data-theme="light"] ::-webkit-scrollbar-track { background: #f1f5f9; }
[data-theme="light"] ::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.15); }
[data-theme="light"] ::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, 0.25); }

[data-theme="light"] .site-footer { border-top-color: rgba(0, 0, 0, 0.06); }

[data-theme="light"] input[type="text"]:focus,
[data-theme="light"] input[type="search"]:focus,
[data-theme="light"] textarea:focus,
[data-theme="light"] select:focus {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* =============================================
   主题切换按钮
   ============================================= */
#themeToggle {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
}
#themeToggle:hover {
  transform: scale(1.1) !important;
  border-color: var(--primary) !important;
  color: var(--primary) !important;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2) !important;
}
[data-theme="light"] #themeToggle:hover {
  box-shadow: 0 0 16px rgba(37, 99, 235, 0.15) !important;
}