:root {
  color-scheme: light;
  --color-canvas: #f7f0df;
  --color-surface: #fffaf0;
  --color-surface-strong: #fffdf7;
  --color-ink: #193b31;
  --color-muted: #68766d;
  --color-grass: #5c8b58;
  --color-grass-strong: #245c48;
  --color-coral: #df735d;
  --color-coral-strong: #a94c3c;
  --color-note-bg: #fff0d5;
  --color-stage-middle: #e6f0df;
  --color-stage-late: #fff0d5;
  --color-line: rgba(38, 77, 62, 0.16);
  --color-line-strong: rgba(36, 92, 72, 0.34);
  --color-focus: rgba(36, 92, 72, 0.28);
  --color-grass-soft: rgba(92, 139, 88, 0.12);
  --color-coral-soft: rgba(223, 115, 93, 0.12);
  --color-glass-surface: rgba(255, 250, 240, 0.42);
  --color-glass-border: rgba(255, 255, 255, 0.78);
  --color-glass-highlight: rgba(255, 255, 255, 0.82);
  --color-white: #ffffff;
  --font-title: "STSong", "Songti SC", "SimSun", serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-immersive: 28px;
  --radius-immersive-card: 24px;
  --radius-pill: 999px;
  --shadow-subtle: 0 8px 24px rgba(25, 59, 49, 0.08);
  --shadow-float: 0 14px 36px rgba(25, 59, 49, 0.14);
  --shadow-immersive: 0 24px 64px rgba(25, 59, 49, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.82);
  --shadow-immersive-card: 0 22px 48px rgba(25, 59, 49, 0.2), 0 2px 0 rgba(255, 255, 255, 0.78) inset;
  --control-min-size: 44px;
  --content-max: 760px;
  --safe-top: max(16px, env(safe-area-inset-top));
  --safe-right: max(18px, env(safe-area-inset-right));
  --safe-bottom: max(18px, env(safe-area-inset-bottom));
  --safe-left: max(18px, env(safe-area-inset-left));
  --motion-fast: 150ms;
  --motion-medium: 360ms;
  --ease-out: cubic-bezier(0.2, 0.75, 0.2, 1);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  width: 100%;
  max-width: 100vw;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: var(--color-grass-strong);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--safe-top);
  left: var(--safe-left);
  min-height: var(--control-min-size);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-grass-strong);
  color: var(--color-white);
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: none;
}

.site-header,
.app-bar,
.week-gate__brand {
  border-bottom: 1px solid var(--color-line);
}

.brand-button,
.app-brand,
.week-gate__brand span {
  color: var(--color-grass-strong);
}

.search-shell,
.search-field {
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-subtle);
  transition: border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}

.search-shell:focus-within,
.search-field:focus-within {
  border-color: var(--color-grass-strong);
  box-shadow: 0 0 0 3px var(--color-grass-soft);
}

.primary-button,
.secondary-button,
.catalog-link,
.empty-state button {
  display: inline-flex;
  min-height: var(--control-min-size);
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-weight: 850;
  text-decoration: none;
}

.primary-button,
.catalog-link,
.empty-state button {
  border: 1px solid var(--color-grass-strong);
  background: var(--color-grass-strong);
  color: var(--color-white);
}

.secondary-button {
  border: 1px solid var(--color-line-strong);
  background: var(--color-surface);
  color: var(--color-grass-strong);
}

.quick-answer,
.article-callout,
.safety-section,
.hospital-guidance,
.empty-state,
.error-state {
  border-radius: var(--radius-md);
}

.quick-answer {
  border-left: 4px solid var(--color-grass);
  background: var(--color-grass-soft);
}

.article-callout.is-tip {
  border-left: 4px solid var(--color-grass);
  background: var(--color-grass-soft);
}

.article-callout.is-warning,
.safety-section.is-urgent {
  border-left: 4px solid var(--color-coral);
  background: var(--color-coral-soft);
}

.article-callout.is-doctor,
.hospital-guidance {
  border: 1px solid var(--color-line-strong);
  background: var(--color-surface);
}

.source-details {
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}