@font-face {
  font-family: 'Red Hat Display';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../assets/fonts/red-hat-display-latin-500-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Red Hat Display';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../assets/fonts/red-hat-display-latin-700-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/jetbrains-mono-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../assets/fonts/jetbrains-mono-latin-600-normal.woff2') format('woff2');
}

:root {
  --font-display: 'Red Hat Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;

  --accent: #2489fd;
  --accent-dim: rgba(36, 137, 253, 0.16);
  --danger: #ff5f57;

  --fs-xs: 0.78rem;
  --fs-sm: 0.9rem;
  --fs-base: 1rem;
  --fs-lg: 1.12rem;
  --fs-xl: 1.35rem;
  --fs-2xl: clamp(1.4rem, 1.2rem + 1.2vw, 2rem);
  --fs-3xl: clamp(1.8rem, 1.3rem + 2.8vw, 3.1rem);
  --fs-4xl: clamp(2.2rem, 1.3rem + 5vw, 4.4rem);
  --fs-hero: clamp(2.5rem, 1.4rem + 6vw, 5.2rem);

  --lh-tight: 1.1;
  --lh-relaxed: 1.72;

  --space-sm: 0.75rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;

  --container-max: 1360px;
  --container-pad: clamp(1.25rem, 1rem + 2.5vw, 3.5rem);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-nav: 20px;
  --radius-nav-btn: 11px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.76, 0, 0.24, 1);

  --glass-blur: blur(20px) saturate(180%) brightness(1.08);
  --shadow-lg: 0 26px 80px -24px rgba(0, 0, 0, 0.5);
}

:root[data-theme='light'] {
  --bg: #f2f5f1;
  --bg-deep: #e9ede8;
  --surface: rgba(255, 255, 255, 0.62);
  --surface-solid: #ffffff;
  --surface-2: #e6ebe5;
  --text: #151c19;
  --text-2: #56635d;
  --text-3: #8b9791;
  --border: rgba(18, 28, 24, 0.12);
  --border-strong: rgba(18, 28, 24, 0.22);
  --grid-line: rgba(18, 28, 24, 0.06);
  --code-bg: #0e1412;
  --code-text: #d8e6e0;
  --island-bg: rgba(255, 255, 255, 0.62);
  --aurora-opacity: 0.5;
  --logo-src: url('../assets/logo.png');
}

:root[data-theme='dark'] {
  --bg: #0a0d0c;
  --bg-deep: #0e1311;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-solid: #121816;
  --surface-2: #131b18;
  --text: #e6eeea;
  --text-2: #9daca5;
  --text-3: #66746e;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --grid-line: rgba(255, 255, 255, 0.045);
  --code-bg: #0b100e;
  --code-text: #d8e6e0;
  --island-bg: rgba(12, 16, 14, 0.58);
  --aurora-opacity: 0.55;
  --logo-src: url('../assets/logo-dark.png');
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
}

body {
  font-family: var(--font-display);
  font-size: var(--fs-base);
  line-height: var(--lh-relaxed);
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color 0.5s ease, color 0.5s ease;
}

img,
svg,
canvas {
  max-width: 100%;
  display: block;
}

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

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

h1, h2, h3, h4 {
  line-height: var(--lh-tight);
  font-weight: 700;
  letter-spacing: -0.02em;
}

ul, ol {
  list-style: none;
}

code {
  font-family: var(--font-mono);
}

::selection {
  background: var(--accent);
  color: #07142b;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* 背景柔光斑块：为液态玻璃提供可折射的内容 */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg-aurora i {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: var(--aurora-opacity);
  will-change: transform;
}

.bg-aurora i:nth-child(1) {
  width: 46vw;
  height: 46vw;
  top: -12vw;
  left: -10vw;
  background: radial-gradient(circle, rgba(36, 137, 253, 0.16), transparent 70%);
}

.bg-aurora i:nth-child(2) {
  width: 40vw;
  height: 40vw;
  top: 38vh;
  right: -14vw;
  background: radial-gradient(circle, rgba(36, 137, 253, 0.12), transparent 70%);
  animation: aurora-drift 26s var(--ease-out) infinite alternate;
}

.bg-aurora i:nth-child(3) {
  width: 52vw;
  height: 52vw;
  bottom: -20vw;
  left: 22vw;
  background: radial-gradient(circle, rgba(36, 137, 253, 0.1), transparent 70%);
  animation: aurora-drift 32s var(--ease-out) infinite alternate-reverse;
}

.bg-aurora i:nth-child(4) {
  width: 44vw;
  height: 44vw;
  top: 58vh;
  left: -10vw;
  background: radial-gradient(circle, rgba(36, 137, 253, 0.13), transparent 70%);
  animation: aurora-drift 28s var(--ease-out) infinite alternate;
}

.bg-aurora i:nth-child(5) {
  width: 52vw;
  height: 52vw;
  top: 150vh;
  right: -14vw;
  background: radial-gradient(circle, rgba(36, 137, 253, 0.11), transparent 70%);
  animation: aurora-drift 34s var(--ease-out) infinite alternate-reverse;
}

@keyframes aurora-drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(-4vw, 3vw) scale(1.12); }
}

/* 滚动渐显 */
.reveal,
.reveal-left,
.reveal-right {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  will-change: opacity, transform;
}

.reveal-left {
  transform: translateX(-48px);
}

.reveal-right {
  transform: translateX(48px);
}

.reveal.is-in,
.reveal-left.is-in,
.reveal-right.is-in {
  opacity: 1;
  transform: none;
  will-change: auto;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}