/**
 * base.css - 变量、重置、通用样式
 * NEGIAO.github.io 模块化 CSS
 */

/* ========================
   CSS Custom Properties
   ======================== */
:root {
  /* Enhanced Color Palette */
  --background: #0A0E13;
  --background-secondary: #111920;
  --surface: #1A1F2E;
  --surface-elevated: #252A3A;
  --surface-hover: #2D3748;
  --primary: #00D9FF;
  --primary-hover: #00B8E6;
  --primary-light: #33E1FF;
  --accent: #FF6B6B;
  --accent-secondary: #4ECDC4;
  --success: #51CF66;
  --warning: #FFD93D;
  --danger: #FF6B6B;
  --text: #F7FAFC;
  --text-secondary: #E2E8F0;
  --text-muted: #A0AEC0;
  --text-disabled: #718096;
  --border: #2D3748;
  --border-light: #4A5568;
  --border-focus: var(--primary);

  /* Enhanced Gradients */
  --gradient-primary: linear-gradient(135deg, #00D9FF 0%, #0EA5E9 50%, #3B82F6 100%);
  --gradient-accent: linear-gradient(135deg, #ff6b6b 0%, #FF8E8E 50%, #FFA8A8 100%);
  --gradient-success: linear-gradient(135deg, #4784b6 0%, #1d72cd 100%);
  --gradient-warm: linear-gradient(135deg, #FF6B6B 0%, #FFD93D 100%);
  --gradient-cool: linear-gradient(135deg, #00D9FF 0%, #4ECDC4 100%);
  --gradient-hero: linear-gradient(135deg,
      rgba(0, 217, 255, 0.1) 0%,
      rgba(78, 205, 196, 0.05) 35%,
      rgba(255, 107, 107, 0.05) 65%,
      rgba(255, 217, 61, 0.1) 100%);

  /* Glass Morphism */
  --glass-bg: rgba(26, 31, 46, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);

  /* Typography - Enhanced */
  --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', monospace;
  --font-display: 'Inter', 'SF Pro Display', sans-serif;

  /* Spacing - Improved Scale */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 6rem;     /* 96px */

  /* Border Radius - Modern Scale */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Enhanced Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(0, 217, 255, 0.3);
  --shadow-glow-accent: 0 0 20px rgba(255, 107, 107, 0.3);

  /* Transitions - Refined */
  --transition-fast: 0.05s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.1s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.15s cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;

  /* Breakpoints (for reference, used in responsive.css) */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1400px;
}

/* ========================
   Light Theme - 温润质感风格
   设计理念：柔和灰底，层次分明，视觉舒适
   ======================== */
body[data-theme='light'] {
  /* 背景色系 - 温润灰底 */
  --background: #EFF1F5;
  --background-secondary: #E5E8ED;
  --surface: #FFFFFF;
  --surface-elevated: #F5F6F8;
  --surface-hover: #E2E5EA;

  /* 主色调 - 专业蓝 */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #3B82F6;

  /* 强调色 - 保持活力但更柔和 */
  --accent: #EF4444;
  --accent-secondary: #0D9488;
  --success: #16A34A;
  --warning: #F59E0B;
  --danger: #EF4444;

  /* 文字色系 - 清晰层次 */
  --text: #111827;
  --text-secondary: #374151;
  --text-muted: #6B7280;
  --text-disabled: #9CA3AF;

  /* 边框 - 极简细线 */
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --border-focus: #2563EB;

  /* 玻璃效果 - 轻盈通透 */
  --glass-bg: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);

  /* 阴影 - 柔和扩散 */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  --shadow-glow-accent: 0 0 0 3px rgba(239, 68, 68, 0.15);

  /* 渐变 - 保持一致性 */
  --gradient-primary: linear-gradient(135deg, #2563EB 0%, #3B82F6 50%, #60A5FA 100%);
  --gradient-accent: linear-gradient(135deg, #EF4444 0%, #F87171 50%, #FCA5A5 100%);
  --gradient-success: linear-gradient(135deg, #059669 0%, #10B981 100%);
  --gradient-hero: linear-gradient(135deg,
      rgba(37, 99, 235, 0.03) 0%,
      rgba(13, 148, 136, 0.02) 35%,
      rgba(239, 68, 68, 0.02) 65%,
      rgba(245, 158, 11, 0.03) 100%);
}

/* 浅色主题下的额外样式覆盖 */
body[data-theme='light'] .navbar {
  background: rgba(239, 241, 245, 0.95);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

body[data-theme='light'] .navbar--scrolled {
  background: rgba(239, 241, 245, 0.98);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

body[data-theme='light'] .card {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
}

body[data-theme='light'] .card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(37, 99, 235, 0.15);
  transform: translateY(-4px);
}

body[data-theme='light'] .note-toc {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

body[data-theme='light'] .note-toc__link.is-active {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 600;
}

body[data-theme='light'] .btn--secondary {
  background: #FFFFFF;
  border: 1.5px solid rgba(0, 0, 0, 0.15);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

body[data-theme='light'] .btn--secondary:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

body[data-theme='light'] .tech-badge {
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.25);
  color: var(--primary);
}

body[data-theme='light'] .tech-badge:hover {
  background: rgba(37, 99, 235, 0.15);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

body[data-theme='light'] .tech-badge--accent {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.25);
  color: var(--accent);
}

body[data-theme='light'] .tech-badge--success {
  background: rgba(22, 163, 74, 0.1);
  border-color: rgba(22, 163, 74, 0.25);
  color: var(--success);
}

body[data-theme='light'] .tag {
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.1);
  color: var(--text-secondary);
}

body[data-theme='light'] .tag:hover {
  background: rgba(37, 99, 235, 0.1);
  border-color: rgba(37, 99, 235, 0.35);
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.12);
}

body[data-theme='light'] .sidebar {
  background: #FFFFFF;
  border-right: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 2px 0 12px rgba(0, 0, 0, 0.08);
}

body[data-theme='light'] .sidebar__link:hover {
  background: rgba(0, 0, 0, 0.05);
  box-shadow: -3px 0 0 var(--primary) inset;
}

body[data-theme='light'] .sidebar__link.active {
  background: rgba(37, 99, 235, 0.1);
  box-shadow: -3px 0 0 var(--primary) inset;
}

body[data-theme='light'] .sidebar__link::before {
  background: #FFFFFF;
  color: var(--text);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

body[data-theme='light'] .footer {
  background: var(--background-secondary);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

body[data-theme='light'] .back-to-top {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

body[data-theme='light'] .back-to-top:hover {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
}

body[data-theme='light'] .mobile-menu {
  background: rgba(239, 241, 245, 0.98);
  backdrop-filter: blur(20px);
}

body[data-theme='light'] .project-item {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

body[data-theme='light'] .project-item:hover {
  background: #FFFFFF;
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

body[data-theme='light'] .contact-card-icon--primary {
  background: var(--gradient-primary);
}

body[data-theme='light'] .contact-card-icon--accent {
  background: var(--gradient-accent);
}

body[data-theme='light'] .contact-card-icon--success {
  background: var(--gradient-success);
}

body[data-theme='light'] ::selection {
  background: rgba(37, 99, 235, 0.2);
  color: var(--text);
}

body[data-theme='light'] ::-webkit-scrollbar-track {
  background: var(--background-secondary);
}

body[data-theme='light'] ::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-full);
}

body[data-theme='light'] ::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

body[data-theme='light'] .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body[data-theme='light'] .note-content blockquote {
  background: rgba(37, 99, 235, 0.06);
  border-left-color: var(--primary);
  border-left-width: 4px;
}

body[data-theme='light'] .note-content th {
  background: var(--surface-elevated);
  border-bottom: 2px solid rgba(0, 0, 0, 0.1);
}

body[data-theme='light'] .note-content tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.03);
}

body[data-theme='light'] .info-item {
  background: rgba(37, 99, 235, 0.06);
  border-color: rgba(37, 99, 235, 0.15);
}

body[data-theme='light'] .note-card {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

body[data-theme='light'] .note-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

/* ========================
   Reset & Base Styles
   ======================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 4rem;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  line-height: 1.65;
  color: var(--text);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* Enhanced Body Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 15% 15%, rgba(0, 217, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 85% 85%, rgba(255, 107, 107, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 50%, rgba(78, 205, 196, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: -2;
}

/* ========================
   Typography
   ======================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text);
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); margin-bottom: var(--space-lg); }
h2 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: var(--space-lg); }
h3 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h5 { font-size: clamp(1.125rem, 2vw, 1.5rem); }
h6 { font-size: clamp(1rem, 1.5vw, 1.25rem); }

p {
  margin-bottom: var(--space-md);
  line-height: 1.7;
  color: var(--text-secondary);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
}

a:hover {
  color: var(--primary-light);
  text-decoration: none;
}

a:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

/* ========================
   Selection & Scrollbar
   ======================== */
::selection {
  background: rgba(0, 217, 255, 0.3);
  color: var(--text);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) var(--background-secondary);
}

/* ========================
   Layout
   ======================== */
.container {
  max-width: min(1400px, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

/* ========================
   Utility Classes
   ======================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.hidden { display: none; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.gpu-accelerated {
  transform: translateZ(0);
}

.will-change {
  will-change: transform;
}