/* Signal — Global Styles */

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

/* --- Theme variables --- */

:root, [data-theme="dark"] {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #22263a;
  --surface-alt: #151821;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-heading: #f8fafc;
  --border: #2d3348;
  --input-bg: #1e2235;
  --dev-accent: #60a5fa;
  --dev-bg: rgba(96, 165, 250, 0.1);
  --ux-accent: #c084fc;
  --ux-bg: rgba(192, 132, 252, 0.1);
  --qa-accent: #34d399;
  --qa-bg: rgba(52, 211, 153, 0.1);
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

[data-theme="light"] {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-hover: #f8fafc;
  --surface-alt: #f1f5f9;
  --accent: #4f46e5;
  --accent-hover: #6366f1;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-heading: #0f172a;
  --border: #e2e8f0;
  --input-bg: #f8fafc;
  --dev-accent: #2563eb;
  --dev-bg: rgba(37, 99, 235, 0.08);
  --ux-accent: #7c3aed;
  --ux-bg: rgba(124, 58, 237, 0.08);
  --qa-accent: #059669;
  --qa-bg: rgba(5, 150, 105, 0.08);
  --success: #16a34a;
  --warning: #d97706;
  --error: #dc2626;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* --- Base --- */

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

h1, h2, h3 { color: var(--text-heading); line-height: 1.3; }

/* --- Nav --- */

.signal-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent) !important;
  letter-spacing: -0.02em;
  text-decoration: none !important;
  margin-right: auto;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
}

.nav-links a {
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--text-muted);
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover, .nav-links a.active {
  background: var(--surface-hover);
  color: var(--text);
  text-decoration: none;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.nav-hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0;
  flex-shrink: 0;
}

.nav-hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 1px;
  transition: background 0.15s;
}

.nav-hamburger:hover span {
  background: var(--text);
}

/* --- Layout --- */

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
  flex: 1;
}

/* --- Cards --- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

a.card:hover, .card-clickable:hover {
  border-color: var(--accent);
}

/* --- Category sections --- */

.category-section {
  margin-bottom: 2rem;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.category-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

.category-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.category-badge.dev { background: var(--dev-bg); color: var(--dev-accent); }
.category-badge.ux { background: var(--ux-bg); color: var(--ux-accent); }
.category-badge.qa { background: var(--qa-bg); color: var(--qa-accent); }

.category-section.dev .category-header { border-color: var(--dev-accent); }
.category-section.ux .category-header { border-color: var(--ux-accent); }
.category-section.qa .category-header { border-color: var(--qa-accent); }

/* --- Articles --- */

.article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 0.75rem;
  transition: border-color 0.15s;
}

.article:hover {
  border-color: var(--text-muted);
}

.article-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.5rem;
}

.article-title a {
  color: var(--text-heading);
}

.article-title a:hover {
  color: var(--accent);
}

.article-summary {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.source-badge {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
}

/* --- Newsletter header --- */

.newsletter-header {
  text-align: center;
  margin-bottom: 2rem;
}

.newsletter-header h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.newsletter-date {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.newsletter-intro {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text);
  line-height: 1.7;
}

/* --- Empty state --- */

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
}

.empty-state h2 {
  color: var(--text-heading);
  margin-bottom: 0.5rem;
}

.empty-state p {
  max-width: 400px;
  margin: 0 auto 1.5rem;
}

/* --- Forms --- */

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.35rem;
}

input[type="text"],
input[type="url"],
input[type="number"],
input[type="time"],
textarea,
select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.15s;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

textarea { resize: vertical; min-height: 80px; }

/* --- Buttons --- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface-hover);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-danger {
  background: var(--error);
  color: #fff;
}

.btn-danger:hover {
  opacity: 0.9;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

/* --- Archive list --- */

.archive-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: border-color 0.15s;
}

.archive-item:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.archive-edition {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

.archive-title {
  flex: 1;
  font-weight: 500;
  color: var(--text-heading);
}

.archive-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* --- Search --- */

.search-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.search-bar input {
  flex: 1;
}

.search-modes {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.search-mode {
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
}

.search-mode.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* --- Sources list --- */

.source-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

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

.source-name { flex: 1; font-weight: 500; }

.source-url {
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 250px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Toggle switch --- */

.toggle {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 22px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-slider::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle input:checked + .toggle-slider::after {
  transform: translateX(18px);
  background: #fff;
}

/* --- Footer --- */

.signal-footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* --- Disabled button --- */

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* --- Utilities --- */

.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.85rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }

/* --- Responsive --- */

@media (max-width: 640px) {
  .signal-nav { padding: 0 0.75rem; gap: 0.5rem; flex-wrap: wrap; }
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
    border-top: 1px solid var(--border);
    order: 10;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.6rem 0.75rem;
    font-size: 0.9rem;
    border-radius: 6px;
  }
  .signal-nav { height: auto; min-height: 56px; }
  .container { padding: 1.25rem 0.75rem; }
  .newsletter-header h1 { font-size: 1.35rem; }
  .archive-item { flex-wrap: wrap; gap: 0.5rem; }
  .source-url { display: none; }
  .search-bar { flex-direction: column; }
  .flex-between { flex-direction: column; align-items: flex-start; }
  .source-item { flex-wrap: wrap; }
}