:root {
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --text: #18181b;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: #eef2ff;
  --border: #e4e4e7;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --code-bg: #f4f4f5;
  --divider: #e4e4e7;
  --header-bg: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] {
  --bg: #09090b;
  --bg-secondary: #18181b;
  --text: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --accent: #818cf8;
  --accent-hover: #6366f1;
  --accent-light: #1e1b4b;
  --border: #27272a;
  --card-bg: #18181b;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --code-bg: #27272a;
  --divider: #27272a;
  --header-bg: rgba(9, 9, 11, 0.8);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

.search-wrapper {
  position: relative;
}

.search-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  color: var(--text);
  width: 180px;
  transition: border-color 0.2s, width 0.3s;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  width: 240px;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text);
  transition: background 0.2s, border-color 0.2s;
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

.main {
  padding: 3rem 1.5rem 4rem;
}

.main h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.main h1:first-child {
  margin-top: 0;
}

.main h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2rem 0 0.75rem;
  color: var(--text);
}

.main h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--text);
}

.main p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.main a, .footer a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

.main a:hover, .footer a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.main blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
  background: var(--accent-light);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
  font-style: italic;
  font-size: 0.95rem;
}

.main blockquote p {
  margin: 0;
  color: var(--text-secondary);
}

.main hr {
  border: none;
  border-top: 1px solid var(--divider);
  margin: 2rem 0;
  transition: border-color 0.3s;
}

.main table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}

.main th, .main td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.main th {
  font-weight: 600;
  color: var(--text);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.main td {
  color: var(--text-secondary);
}

.main tr:last-child td {
  border-bottom: none;
}

.main tr:hover td {
  background: var(--bg-secondary);
}

.main code {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--text);
}

.main pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border);
  font-size: 0.85rem;
}

.main pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

.main ul, .main ol {
  margin: 0.5rem 0 1rem 1.5rem;
  color: var(--text-secondary);
}

.main li {
  margin-bottom: 0.35rem;
}

.main strong {
  color: var(--text);
  font-weight: 600;
}

.main img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1rem 0;
}

.hero {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  display: block;
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress-bar {
  display: flex;
  gap: 2px;
  margin: 0.75rem 0 1.5rem;
}

.progress-bar span {
  flex: 1;
  height: 8px;
  border-radius: 4px;
  background: var(--border);
  transition: background 0.3s;
}

.progress-bar span.filled {
  background: var(--accent);
}

.build-table {
  width: 100%;
}

.build-table td:first-child {
  width: 40px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.build-table td:last-child {
  text-align: right;
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

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

.month-section h2 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.month-section h2 a {
  color: var(--text);
}

.month-section h2 a:hover {
  color: var(--accent);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--accent-light);
  color: var(--accent);
}

.badge-streak {
  background: #fef3c7;
  color: #b45309;
}

[data-theme="dark"] .badge-streak {
  background: #451a03;
  color: #fbbf24;
}

.badge-goal {
  background: #dbeafe;
  color: #1d4ed8;
}

[data-theme="dark"] .badge-goal {
  background: #1e3a5f;
  color: #60a5fa;
}

.celebration-block {
  background: var(--accent-light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  font-size: 0.95rem;
  color: var(--text);
}

.streak-calendar {
  display: grid;
  grid-template-columns: repeat(53, 1fr);
  gap: 3px;
  margin: 1.5rem 0;
}

.streak-day {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 2px;
  background: var(--border);
  transition: background 0.2s;
}

.streak-day.filled {
  background: var(--accent);
}

.streak-day.today {
  border: 2px solid var(--accent);
  background: var(--accent-hover);
}

.streak-day:hover {
  transform: scale(1.3);
  z-index: 1;
}

.entry-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

.entry-nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: background 0.2s;
}

.entry-nav a:hover {
  background: var(--accent-light);
  text-decoration: none;
}

.entry-nav-spacer {
  flex: 1;
}

.tech-history-section {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1.5rem 0;
  background: var(--accent-light);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1rem 1rem 1.25rem;
}

.tech-history-section h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.tech-history-section small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.tech-history-section small a {
  color: var(--accent);
  text-decoration: none;
}

.tech-history-section small a:hover {
  text-decoration: underline;
}

.today-section {
  border-left: 3px solid #10b981;
  padding-left: 1rem;
  margin: 1.5rem 0;
  background: rgba(16, 185, 129, 0.08);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1rem 1rem 1.25rem;
}

.today-section h2 {
  margin-top: 0;
  font-size: 1.1rem;
  color: #10b981;
}

.today-section p {
  margin: 0.5rem 0;
  font-size: 0.9rem;
}

.title-truncate {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 300px;
}

@media (max-width: 600px) {
  .title-truncate {
    max-width: 180px;
  }
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 1000;
  text-decoration: none;
  font-weight: 500;
  border-radius: 0 0 8px 0;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-hover);
}

.search-results {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  transition: border-color 0.3s;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (max-width: 600px) {
  .main {
    padding: 2rem 1rem 3rem;
  }

  .main h1 {
    font-size: 1.4rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.25rem;
    text-align: center;
  }

  .container {
    padding: 0 1rem;
  }

  .search-input {
    width: 120px;
  }

  .search-input:focus {
    width: 160px;
  }

  .streak-calendar {
    grid-template-columns: repeat(26, 1fr);
  }

  .entry-nav {
    flex-direction: column;
    gap: 0.5rem;
  }
}