/* === Design Tokens === */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.2vw, 0.875rem);
  --text-base: clamp(0.875rem, 0.85rem + 0.15vw, 0.9375rem);
  --text-lg:   clamp(1rem, 0.95rem + 0.25vw, 1.125rem);

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;

  --radius-sm: 4px;
  --radius-md: 6px;

  --font-mono: 'IBM Plex Mono', 'SF Mono', 'Consolas', monospace;
  --font-body: 'Inter', -apple-system, system-ui, sans-serif;
  --font-title: 'Inter', -apple-system, system-ui, sans-serif;

  --transition-fast: 120ms ease;
}

/* === Light palette (default) === */
:root, [data-theme="light"] {
  --color-bg: #faf9f6;
  --color-surface: #faf9f6;
  --color-surface-hover: #f5f4f0;
  --color-border: rgba(212, 42, 32, 0.15);
  --color-text: #d42a20;
  --color-text-muted: #d42a20;
  --color-text-faint: rgba(212, 42, 32, 0.5);
  --color-accent: #d42a20;
  --color-accent-dim: rgba(212, 42, 32, 0.08);
  --color-link: #d42a20;
  --color-link-hover: rgba(212, 42, 32, 0.55);
}

[data-theme="dark"] {
  --color-bg: #0d1117;
  --color-surface: #0d1117;
  --color-surface-hover: #1c2333;
  --color-border: rgba(232, 69, 58, 0.2);
  --color-text: #e8453a;
  --color-text-muted: #e8453a;
  --color-text-faint: rgba(232, 69, 58, 0.5);
  --color-accent: #e8453a;
  --color-accent-dim: rgba(232, 69, 58, 0.12);
  --color-link: #e8453a;
  --color-link-hover: rgba(232, 69, 58, 0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0d1117;
    --color-surface: #0d1117;
    --color-surface-hover: #1c2333;
    --color-border: rgba(232, 69, 58, 0.2);
    --color-text: #e8453a;
    --color-text-muted: #e8453a;
    --color-text-faint: rgba(232, 69, 58, 0.5);
    --color-accent: #e8453a;
    --color-accent-dim: rgba(232, 69, 58, 0.12);
    --color-link: #e8453a;
    --color-link-hover: rgba(232, 69, 58, 0.55);
  }
}

/* === Base Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
}

a { color: var(--color-link); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-link-hover); }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
  padding: 4px 10px;
  line-height: 1;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.last-updated {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.theme-btn {
  display: flex;
  align-items: center;
  padding: 2px;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}
.theme-btn:hover { color: var(--color-text); }

/* === Header Link === */
.header-link {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity var(--transition-fast);
  white-space: nowrap;
}
.header-link:hover {
  opacity: 0.6;
  color: var(--color-accent);
}

/* === Source Select === */
.source-select {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-accent);
  background: transparent;
  color: var(--color-accent);
  cursor: pointer;
  transition: opacity var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.source-select:hover,
.source-select:focus {
  opacity: 0.6;
  outline: none;
}

/* === News List === */
.news-list {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-2) var(--space-4);
  flex: 1;
}

.news-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  animation: fadeIn 200ms ease;
}

.news-item:last-child { border-bottom: none; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.item-rank {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  min-width: 2ch;
  text-align: right;
  padding-top: 2px;
  flex-shrink: 0;
}

.item-content {
  flex: 1;
  min-width: 0;
}

.item-title-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.item-title {
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-link);
}
.item-title:hover { color: var(--color-link-hover); }

.item-domain {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  white-space: nowrap;
  flex-shrink: 0;
}

.item-description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-top: var(--space-1);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.item-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.source-badge {
  font-weight: 500;
  padding: 1px var(--space-2);
  border-radius: 9999px;
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--color-text-faint);
  background: var(--color-accent-dim);
}

.meta-sep { color: var(--color-border); }


/* === Loading State === */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-8) 0;
  color: var(--color-text-muted);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: var(--space-8) 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* === Newsletter Banner === */
.newsletter-banner {
  background: var(--color-accent-dim);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-4);
}

.newsletter-banner-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.newsletter-banner-text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.newsletter-banner-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px var(--space-3);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-bg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}
.newsletter-banner-cta:hover {
  opacity: 0.8;
  color: var(--color-bg);
}

/* === Newsletter Section === */
.newsletter-section {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.newsletter-heading {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.newsletter-subtext {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-bottom: var(--space-6);
}

.newsletter-iframe {
  width: 100%;
  max-width: 623px;
  height: 339px;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
}

/* === Footer === */
.site-footer {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.site-footer a {
  color: var(--color-text-faint);
}
.site-footer a:hover { color: var(--color-accent); }

/* === Mobile === */
@media (max-width: 640px) {
  .site-header { padding: var(--space-2) var(--space-3); }
  .news-list { padding: var(--space-2) var(--space-3); }
  .news-item { gap: var(--space-2); }
  .item-rank { min-width: 2ch; font-size: var(--text-xs); }
  .item-title-row { flex-direction: column; gap: 0; }
  .item-domain { margin-top: 2px; }
  .site-footer { flex-direction: column; text-align: center; }
  .last-updated { display: none; }
  .newsletter-banner-inner { flex-direction: column; text-align: center; }
  .newsletter-banner-text { white-space: normal; }
}

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