@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: fallback;
  src: url("/assets/fonts/Inter-roman.var.woff2") format("woff2");
}

:root {
  --color-white: #fff;
  --color-black: #000;
  --color-text-primary: #1f2937;
  --color-text-heading: #27364a;
  --color-text-secondary: #475569;
  --color-text-subtle: #5b6b7e;
  --color-text-faint: #64748b;
  --color-text-disabled: #94a3b8;
  --color-background-page: #fafbfc;
  --color-background-footer: #f1f1f1;
  --color-background-surface: #fff;
  --color-background-surface-muted: #f9f9f9;
  --color-background-surface-softer: #f3f3f3;
  --color-background-chip: #f2f2f2;
  --color-background-chip-active: #e0e0e0;
  --color-border-light: #e6e6e6;
  --color-brand-primary: #3fa7a1;
  --color-action-primary: #216e69;
  --color-action-primary-hover: #185852;
  --color-link-primary: #0066cc;
  --color-link-markdown: #0969da;
  --color-link-level-2: #0080ff;
  --color-link-level-3: #289728;
  --color-markdown-muted: #59636e;
  --color-markdown-surface-muted: #f6f8fa;
  --color-markdown-border: #d1d9e0;
  --color-callout-updated-start: #1e3c72;
  --color-callout-updated-end: #2a5298;
  --color-callout-updated-border: #315fae;
  --color-mobile-menu-background: #222;
  --color-overlay-light: rgba(255, 255, 255, 0.1);
  --color-overlay-dark: rgba(0, 0, 0, 0.4);
  --color-shadow-card: rgba(34, 56, 101, 0.04);
  --color-shadow-card-hover: rgba(34, 56, 101, 0.08);
  --color-shadow-image: rgba(0, 0, 0, 0.20);
  --color-shadow-action: rgba(24, 88, 82, 0.2);

  --font-size-root: 16px;
  --font-size-widget-title: 1.0625rem;
  --font-family-cjk: "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", system-ui, sans-serif;
  --font-family-ui: "Inter", var(--font-family-cjk);
  --font-weight-semibold: 600;
  --letter-spacing-ui: 0.02em;

  --space-0: 0rem;
  --space-1px: 0.0625rem;
  --space-4: 0.25rem;
  --space-8: 0.5rem;
  --space-12: 0.75rem;
  --space-16: 1rem;
  --space-20: 1.25rem;
  --space-24: 1.5rem;
  --space-28: 1.75rem;
  --space-32: 2rem;
  --space-36: 2.25rem;
  --space-40: 2.5rem;
  --space-48: 3rem;
  --space-56: 3.5rem;
  --space-60: 3.75rem;
  --space-64: 4rem;

  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;

  --shadow-card: 0 0.75rem 1.125rem -0.375rem var(--color-shadow-card);
  --shadow-card-hover: 0 1.125rem 1.75rem -0.5rem var(--color-shadow-card-hover);
  --shadow-image: 0 1rem 2.5rem -0.75rem var(--color-shadow-image);

  --font-size-toc-toggle: 1.5625rem;
  --font-size-toc-level-2: 1.08rem;
  --font-size-toc-level-3: 0.98rem;
  --font-size-toc-level-2-marker: 1.125rem;
  --font-size-toc-level-3-marker: 0.875rem;

  --size-toc-marker: 0.625rem;
  --size-toc-marker-stroke: 0.125rem;
  --z-index-skip-link: 1100;
}

/* ===== Reset ===== */

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

html {
  font-size: var(--font-size-root);
  height: 100%;
}

body {
  height: 100%;
}

/* ===== 全站基本樣式 ===== */

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-background-page);
  color: var(--color-text-primary);
  font-family: var(--font-family-cjk);
  line-height: 1.6;
}

.site-header,
aside,
.site-footer {
  font-family: var(--font-family-ui);
}

.skip-link {
  position: absolute;
  top: var(--space-8);
  left: var(--space-16);
  z-index: var(--z-index-skip-link);
  padding: var(--space-8) var(--space-12);
  border-radius: var(--radius-md);
  background: var(--color-action-primary);
  color: var(--color-white);
  font-family: var(--font-family-ui);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus-visible {
  outline: var(--space-4) solid var(--color-white);
  outline-offset: var(--space-4);
  transform: translateY(0);
}

/* ===== 容器 ===== */

.container {
  flex: 1;
  width: 100%;
  max-width: 90rem;
  margin: 0 auto;
  padding: 0 var(--space-16);
}

.card {
  background: var(--color-background-surface);
  padding: var(--space-24);
  box-shadow: var(--shadow-card);
}

/* ===== Header ===== */

.site-header {
  background-color: var(--color-brand-primary);
  padding: var(--space-12) 0;
  margin-bottom: var(--space-60);
}

/* ===== Main + Aside 切版 ===== */

.content-wrapper {
  display: flex;
  gap: var(--space-48);
  align-items: flex-start;
  padding-bottom: var(--space-40);
}

.content-wrapper > * {
  min-width: 0;
}

main {
  flex: 2.5 1 0;
}

aside {
  display: flex;
  flex: 1 1 0;
  flex-direction: column;
  gap: var(--space-20);
  overflow-wrap: break-word;
  word-break: break-word;
}

.sidebar-widget {
  padding-inline: var(--space-32);
}

.category-widget {
  padding-block: var(--space-20);
}

.widget-title {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-12);
  padding: var(--space-8) var(--space-12);
  border-bottom: 0;
  color: var(--color-white);
  background-color: var(--color-action-primary);
  font-family: var(--font-family-ui);
  font-size: var(--font-size-widget-title);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-ui);
  text-align: center;
}

aside :is(a, button, input, select, textarea):focus-visible {
  outline: var(--space-4) solid var(--color-link-primary);
  outline-offset: var(--space-4);
}

/* ===== 手機版 ===== */

@media (max-width: 48rem) {
  .content-wrapper {
    flex-direction: column;
    align-items: stretch;
  }

  aside {
    display: none;
  }
}

/* ===== Footer ===== */

.site-footer {
  background-color: var(--color-background-footer);
  color: var(--color-text-primary);
  padding: var(--space-16) 0;
}