/* ============================================================
 *  base.css  ——  全局变量、Reset、排版基础
 *  设计基调：深蓝紫渐变 + 玻璃质感 + 圆角卡片
 * ============================================================ */

/* ---------- 主题变量（默认深色） ---------- */
:root,
:root[data-theme='dark'] {
  --bg-primary: #0f1115;
  --bg-secondary: #161922;
  --bg-tertiary: #1d212c;
  --bg-elevated: rgba(255, 255, 255, 0.04);
  --bg-elevated-strong: rgba(255, 255, 255, 0.08);

  --text-primary: #e6e8ee;
  --text-secondary: #9aa0b0;
  --text-tertiary: #5e6373;
  --text-inverse: #0f1115;

  --accent: #7c5cff;
  --accent-2: #4ea0ff;
  --accent-3: #ff6bcb;
  --accent-faint: rgba(124, 92, 255, 0.12);
  --accent-faint-2: rgba(78, 160, 255, 0.10);
  --gradient: linear-gradient(135deg, #7c5cff 0%, #4ea0ff 100%);
  --gradient-soft: linear-gradient(
    135deg,
    rgba(124, 92, 255, 0.12) 0%,
    rgba(78, 160, 255, 0.12) 100%
  );
  --gradient-hero: radial-gradient(
      ellipse 60% 40% at 25% 25%,
      rgba(124, 92, 255, 0.18) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 35% at 75% 75%,
      rgba(78, 160, 255, 0.14) 0%,
      transparent 60%
    );

  --border: #232733;
  --border-strong: #2e3340;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);

  --code-bg: #0a0c12;
  --selection-bg: rgba(124, 92, 255, 0.3);
  color-scheme: dark;
}

:root[data-theme='light'] {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f8fa;
  --bg-tertiary: #eef0f3;
  --bg-elevated: rgba(255, 255, 255, 0.7);
  --bg-elevated-strong: rgba(255, 255, 255, 0.95);

  --text-primary: #1a1d24;
  --text-secondary: #5a6070;
  --text-tertiary: #8c91a0;
  --text-inverse: #ffffff;

  --accent: #5a3eff;
  --accent-2: #2070e6;
  --accent-3: #d83aa0;
  --accent-faint: rgba(90, 62, 255, 0.08);
  --accent-faint-2: rgba(32, 112, 230, 0.08);
  --gradient: linear-gradient(135deg, #5a3eff 0%, #2070e6 100%);
  --gradient-soft: linear-gradient(
    135deg,
    rgba(90, 62, 255, 0.08) 0%,
    rgba(32, 112, 230, 0.08) 100%
  );
  --gradient-hero: radial-gradient(
      ellipse 60% 40% at 25% 25%,
      rgba(90, 62, 255, 0.12) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 35% at 75% 75%,
      rgba(32, 112, 230, 0.10) 0%,
      transparent 60%
    );

  --border: #e6e8ed;
  --border-strong: #d0d4dc;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);

  --code-bg: #f0f1f5;
  --selection-bg: rgba(90, 62, 255, 0.15);
  color-scheme: light;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--border-strong) transparent;
}

body {
  margin: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  background-image: var(--gradient-hero);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}

::selection {
  background: var(--selection-bg);
  color: var(--text-primary);
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-2);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input,
select,
textarea {
  font-family: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.25rem;
}
h2 {
  font-size: 1.625rem;
}
h3 {
  font-size: 1.25rem;
}
h4 {
  font-size: 1.05rem;
}

p {
  margin: 0 0 1em;
}

code,
kbd,
pre,
samp {
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas,
    'Liberation Mono', Menlo, monospace;
  font-size: 0.92em;
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 64px 0;
}

@media (max-width: 768px) {
  .section {
    padding: 40px 0;
  }
  h1 {
    font-size: 1.75rem;
  }
  h2 {
    font-size: 1.375rem;
  }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 10px;
}

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

/* ---------- 实用类 ---------- */
.text-gradient {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.glass {
  background: var(--bg-elevated);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
}

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

/* HTML 原生 [hidden] 应始终生效，避免被组件 display:grid/flex 覆盖 */
[hidden] { display: none !important; }

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}