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

:root {
  --bg: #fff;
  --fg: #111;
  --muted: #666;
  --border: #e5e5e5;
  --primary: #000;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --fg: #fff;
    --muted: #999;
    --border: #333;
    --primary: #fff;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

nav a:hover {
  color: var(--fg);
}

.filters {
  display: flex;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.filter {
  background: none;
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  color: var(--fg);
}

.filter.active {
  background: var(--primary);
  color: var(--bg);
  border-color: var(--primary);
}

.articles {
  padding: 16px 0;
}

.article-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

.article-item:hover {
  opacity: 0.7;
}

.article-item h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.article-item .meta {
  font-size: 12px;
  color: var(--muted);
}

.loading {
  text-align: center;
  padding: 32px;
  color: var(--muted);
}

.article {
  padding: 24px 0;
}

.article h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article .meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 24px;
}

.summary {
  background: var(--border);
  padding: 16px;
  border-radius: 8px;
  margin-bottom: 24px;
  font-size: 14px;
}

.content {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 24px;
}

.content p {
  margin-bottom: 12px;
}

.original-link {
  display: inline-block;
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  border-bottom: 1px solid var(--primary);
}

.subscribe-box {
  max-width: 400px;
  margin: 48px auto;
}

.subscribe-box h1 {
  font-size: 24px;
  margin-bottom: 8px;
}

.subscribe-box > p {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}

.time-grid, .cat-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  cursor: pointer;
}

.checkbox input {
  cursor: pointer;
}

input[type="email"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  background: var(--bg);
  color: var(--fg);
}

.btn {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.8;
}

.message {
  margin-top: 16px;
  font-size: 13px;
  text-align: center;
}

.message.success {
  color: #16a34a;
}

.message.error {
  color: #dc2626;
}

footer {
  border-top: 1px solid var(--border);
  padding: 16px 0;
  margin-top: 48px;
}

footer p {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}