/* ainews design tokens — light default, dark via prefers-color-scheme */
:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --surface-2: #f0f0ee;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --border: #e3e3e0;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --danger: #b91c1c;
  --danger-bg: #fdecea;
  --danger-border: #f3b7b0;
  --chip-bg: #eef2ff;
  --chip-text: #3730a3;
  --quote-bg: #f5f5f4;
  --toast-bg: #1a1a1a;
  --toast-text: #ffffff;
  --btn-bg: var(--surface);
  --btn-active-bg: var(--accent);
  --btn-active-text: var(--accent-contrast);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06);

  --radius-card: 12px;
  --radius-chip: 999px;
  --gutter: 16px;
  --max-width: 760px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --surface: #1f1f24;
    --surface-2: #26262c;
    --text: #ececec;
    --text-muted: #9a9a9f;
    --border: #33333a;
    --accent: #60a5fa;
    --accent-contrast: #0b1220;
    --danger: #f87171;
    --danger-bg: #2a1414;
    --danger-border: #5c2626;
    --chip-bg: #26264a;
    --chip-text: #c7d2fe;
    --quote-bg: #232327;
    --toast-bg: #ececec;
    --toast-text: #16161a;
    --btn-bg: var(--surface-2);
    --btn-active-bg: var(--accent);
    --btn-active-text: var(--accent-contrast);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);

    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px var(--gutter) 48px;
}

/* header */
.header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 0 16px;
}

.header h1 {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
  min-width: 116px;
  text-align: center;
}

.nav-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  width: 36px;
  height: 36px;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.nav-btn:active {
  transform: translateY(1px);
}

/* banner / empty state */
.banner {
  border: 1px solid var(--danger-border);
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: var(--radius-card);
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 14px;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 64px 16px;
  font-size: 15px;
}

/* sections */
.section {
  margin-bottom: 28px;
}

.section-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  margin: 0 0 10px;
  padding-left: 2px;
}

/* card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 14px 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.card img.card-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 10px;
  display: block;
  background: var(--surface-2);
}

.card h3.card-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 2px;
}

.card .title-en {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0 0 8px;
}

.card ul.summary {
  margin: 8px 0;
  padding-left: 20px;
}

.card ul.summary li {
  margin: 4px 0;
  font-size: 14.5px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0;
}

.chip {
  background: var(--chip-bg);
  color: var(--chip-text);
  border-radius: var(--radius-chip);
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
}

blockquote.quote {
  margin: 8px 0;
  padding: 8px 12px;
  background: var(--quote-bg);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: 13.5px;
  color: var(--text-muted);
  font-style: italic;
}

.why {
  font-size: 14px;
  margin: 8px 0;
}

.github-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin: 8px 0;
}

.card-footer {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.card-footer a {
  color: var(--accent);
  text-decoration: none;
}

.card-footer a:hover {
  text-decoration: underline;
}

/* feedback bar */
.feedback-bar {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.fb-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}

.fb-btn.active {
  background: var(--btn-active-bg);
  color: var(--btn-active-text);
  border-color: var(--btn-active-bg);
}

.fb-btn[disabled] {
  cursor: not-allowed;
  opacity: 0.55;
}

.fb-disabled-label {
  font-size: 12.5px;
  color: var(--text-muted);
}

.fb-why-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 12.5px;
  cursor: pointer;
  padding: 4px 2px;
  text-decoration: underline;
}

.fb-note-input {
  flex: 1 1 100%;
  margin-top: 6px;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  background: var(--surface);
  color: var(--text);
}

/* toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--toast-bg);
  color: var(--toast-text);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13.5px;
  box-shadow: var(--shadow);
  z-index: 100;
  max-width: calc(100% - 32px);
}