:root {
  color-scheme: light dark;
  background-color: var(--bg-primary);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
  background: var(--bg-primary);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overflow-x: hidden;
}

a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-primary);
}

p {
  margin: 0 0 var(--space-md);
  color: var(--text-secondary);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-display);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin: 0 0 var(--space-md);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

strong {
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

small {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.surface-primary { background: var(--bg-primary); }
.surface-secondary { background: var(--bg-secondary); }
.surface-tertiary { background: var(--bg-tertiary); }
.surface-elevated { background: var(--bg-elevated); }

.surface-glass {
  background:
    radial-gradient(circle at 12% 18%, rgba(16, 17, 20, 0.18), transparent 55%),
    radial-gradient(circle at 90% 12%, rgba(16, 17, 20, 0.14), transparent 50%),
    rgba(16, 17, 20, 0.08);
  backdrop-filter: blur(20px);
}

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-muted { color: var(--text-muted); }
.text-inverse { color: var(--text-inverse); }

.border-primary { border-color: var(--border-primary); }
.border-secondary { border-color: var(--border-secondary); }
.border-accent { border-color: var(--border-accent); }
.border-primary-soft { border-color: rgba(16, 17, 20, 0.12); }
.border-accent-soft { border-color: rgba(16, 17, 20, 0.2); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }
.bg-tertiary { background: var(--bg-tertiary); }
.bg-elevated { background: var(--bg-elevated); }

.gradient-primary { background: var(--gradient-primary); }
.gradient-secondary { background: var(--gradient-secondary); }
.gradient-accent { background: var(--gradient-accent); }
.gradient-subtle { background: var(--gradient-subtle); }

.shadow-theme-sm { box-shadow: var(--shadow-sm); }
.shadow-theme-md { box-shadow: var(--shadow-md); }
.shadow-theme-lg { box-shadow: var(--shadow-lg); }
.shadow-theme-xl { box-shadow: var(--shadow-xl); }
.shadow-theme-glow { box-shadow: var(--shadow-glow, var(--shadow-xl)); }

.glass-border {
  border: 1px solid rgba(16, 17, 20, 0.08);
  backdrop-filter: blur(14px);
}

.card {
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

button,
input,
textarea,
select {
  font-family: var(--font-family-body);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-secondary);
  background: #101114;
  color: var(--text-inverse);
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

input,
textarea,
select {
  background: rgba(255, 255, 255, 0.6);
  color: var(--text-primary);
  border: 1px solid rgba(16, 17, 20, 0.12);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-tertiary);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: rgba(16, 17, 20, 0.35);
  box-shadow: var(--focus-ring);
}

button {
  cursor: pointer;
  font-weight: var(--font-semibold);
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

button:active {
  transform: translateY(0);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  background: rgba(16, 17, 20, 0.85);
  color: var(--text-inverse);
  font-size: var(--text-sm);
  border: 1px solid rgba(16, 17, 20, 0.3);
}

.backdrop-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 25% 20%, rgba(0, 0, 0, 0.05), transparent 55%),
    radial-gradient(circle at 75% 10%, rgba(0, 0, 0, 0.08), transparent 50%);
  opacity: 0.18;
  z-index: -1;
}

.code-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-xl);
  color: var(--text-primary);
}

.code-card:hover {
  box-shadow: var(--shadow-md);
}

.code-display {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition:
    background var(--transition-normal),
    border-color var(--transition-normal),
    color var(--transition-normal),
    transform var(--transition-normal);
}

.code-display:hover {
  background: rgba(16, 17, 20, 0.05);
  border-color: rgba(16, 17, 20, 0.2);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: rgba(240, 240, 244, 0.75);
}

::-webkit-scrollbar-thumb {
  background: rgba(16, 17, 20, 0.25);
  border-radius: var(--radius-full);
  border: 2px solid transparent;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(16, 17, 20, 0.45);
}

::selection {
  background: rgba(16, 17, 20, 0.9);
  color: var(--text-inverse);
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

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

/* 按钮悬浮状态统一优化 */
:where(a, button)[class*="bg-[var(--bg-elevated)]"] {
  transition: color var(--transition-fast, 0.2s),
    background-color var(--transition-fast, 0.2s),
    box-shadow var(--transition-fast, 0.2s),
    transform var(--transition-fast, 0.2s);
}

:where(a, button)[class*="bg-[var(--bg-elevated)]"]:hover,
:where(a, button)[class*="bg-[var(--bg-elevated)]"]:focus-visible {
  background-color: rgba(16, 17, 20, 0.88);
  color: var(--text-inverse);
  box-shadow: 0 12px 24px rgba(16, 17, 20, 0.18);
  transform: translateY(-1px);
}

:where(a, button)[class*="border"][class*="text-primary"] {
  transition: color var(--transition-fast, 0.2s),
    background-color var(--transition-fast, 0.2s),
    border-color var(--transition-fast, 0.2s),
    box-shadow var(--transition-fast, 0.2s);
}

:where(a, button)[class*="border"][class*="text-primary"]:hover,
:where(a, button)[class*="border"][class*="text-primary"]:focus-visible {
  background-color: rgba(16, 17, 20, 0.06);
  color: var(--text-primary);
  border-color: rgba(16, 17, 20, 0.18);
  box-shadow: 0 10px 22px rgba(16, 17, 20, 0.12);
}

:where(a, button).copy-btn,
:where(a, button)[class*="copy-btn"] {
  transition: color var(--transition-fast, 0.2s),
    background-color var(--transition-fast, 0.2s),
    box-shadow var(--transition-fast, 0.2s);
}

:where(a, button).copy-btn:hover,
:where(a, button)[class*="copy-btn"]:hover,
:where(a, button).copy-btn:focus-visible,
:where(a, button)[class*="copy-btn"]:focus-visible {
  color: var(--text-inverse);
}


.code-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(234, 235, 240, 0.85));
  border: 1px solid rgba(16, 17, 20, 0.12);
  box-shadow: 0 10px 18px rgba(16, 17, 20, 0.08);
  color: var(--text-primary);
  font-family: var(--font-family-mono);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
}

.code-chip span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
}

.code-chip:hover,
.code-chip:focus-visible {
  border-color: rgba(16, 17, 20, 0.22);
  box-shadow: 0 12px 22px rgba(16, 17, 20, 0.12);
  transform: translateY(-2px);
}