/* =====================================================
   LINUS SEAH — Personal Site
   Clean, minimal stylesheet inspired by kohweijie.com
   ===================================================== */

/* ── Google Fonts: Lora (ET Book / Palatino style serif) ── */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;1,400;1,500&display=swap');

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

:root {
  --text:       #1a1a2e;
  --text-light: #64748b;
  --text-muted: #94a3b8;
  --accent:     #2563eb;
  --accent-hover:#1d4ed8;
  --bg:         #ffffff;
  --bg-alt:     #f8fafc;
  --border:     #e2e8f0;
  --max-width:  680px;
  --font-sans:  -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  --font-serif: 'Lora', 'Palatino Linotype', Palatino, 'Book Antiqua', Georgia, serif;
  --font-mono:  'SF Mono', 'Fira Code', 'Consolas', monospace;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ── */
nav {
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

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

.nav-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-name:hover { color: var(--accent); }

.nav-photo {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

/* ── Page Header ── */
.page-header {
  margin-bottom: 48px;
}

.page-header h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 8px;
}

.page-header .subtitle {
  font-size: 18px;
  color: var(--text-light);
  line-height: 1.5;
}

/* ── Home Page ── */
.home-intro {
  padding: 4px 0 48px;
}

.home-intro h1 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 16px;
  line-height: 1.3;
}

.home-intro p {
  font-size: 17px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 560px;
}

.home-intro .links {
  margin-top: 20px;
  display: flex;
  gap: 18px;
  align-items: center;
}

.home-intro .links a {
  color: var(--text-light);
  text-decoration: none;
  display: flex;
  align-items: center;
  transition: color 0.15s;
}

.home-intro .links a:hover { color: var(--accent); }

.cv-link {
  display: inline-block;
  margin-top: 16px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
}

.cv-link:hover { text-decoration: underline; }

/* ── Section Headings ── */
.section-heading {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ── Card List (Projects, Blog) ── */
.card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.card {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.card:last-child { border-bottom: none; }

.card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

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

.card-meta {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.card-desc {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.6;
}

.card-tags {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 12px;
}

/* ── Blog Post Layout ── */
.post-header {
  margin-bottom: 40px;
}

.post-header .series {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
}

.post-header h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 10px;
}

.post-header .post-subtitle {
  font-size: 18px;
  color: var(--text-light);
  font-style: italic;
  line-height: 1.5;
  margin-bottom: 10px;
}

.post-header .post-meta {
  font-size: 14px;
  color: var(--text-muted);
}

.post-header .post-meta a {
  color: var(--accent);
  text-decoration: none;
}

/* ── Prose (Blog Post Body) ── */
.prose {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.75;
}

.prose p { margin-bottom: 20px; }

.prose h2 {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.prose h3 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  color: #334155;
  margin: 32px 0 12px;
}

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

.prose strong { color: #0f172a; }

.prose code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  color: #334155;
}

.prose pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 20px 24px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
  margin: 24px 0;
}

.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.prose .code-source {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  margin-top: -16px;
  margin-bottom: 24px;
}

.prose .code-source a { color: var(--accent); font-size: 12px; }

.prose img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.prose .figure {
  margin: 36px 0;
  text-align: center;
}

.prose .caption {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
  font-style: italic;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
  font-family: var(--font-sans);
}

.prose th {
  background: var(--bg-alt);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
  color: #334155;
}

.prose td {
  padding: 10px 16px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: top;
  color: #475569;
}

/* ── Callout Boxes ── */
.callout {
  background: var(--bg-alt);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  margin: 32px 0;
  font-size: 17px;
  font-style: italic;
  color: #334155;
  border-radius: 0 8px 8px 0;
}

.callout strong { color: #1e293b; font-style: normal; }

.insight-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 20px 24px;
  margin: 32px 0;
  font-family: var(--font-sans);
  font-size: 16px;
}

.insight-box .label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #15803d;
  margin-bottom: 8px;
}

.warning-box {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: 20px 24px;
  margin: 32px 0;
  font-family: var(--font-sans);
  font-size: 16px;
}

.warning-box .label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #92400e;
  margin-bottom: 8px;
}

.cost-highlight {
  background: #faf5ff;
  border: 1px solid #e9d5ff;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  text-align: center;
  font-family: var(--font-sans);
}

.cost-highlight .amount {
  font-size: 32px;
  font-weight: 700;
  color: #7c3aed;
}

.cost-highlight .context {
  font-size: 14px;
  color: #6b7280;
}

/* ── Next Post Teaser ── */
.next-post {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 40px 0;
  font-family: var(--font-sans);
}

.next-post .label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 6px;
}

.next-post .title { font-size: 18px; font-weight: 600; }
.next-post a { color: var(--text); text-decoration: none; }
.next-post a:hover { color: var(--accent); }

/* Bug header for Post 2 */
.prose .bug-header {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  color: #dc2626;
  margin: 28px 0 8px;
}

/* ── Post Footer ── */
.post-footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 2px solid var(--border);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-light);
}

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

/* ── About Page ── */
.about-content {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-light);
}

.about-content p { margin-bottom: 16px; }
.about-content a { color: var(--accent); text-decoration: none; }
.about-content a:hover { text-decoration: underline; }

.about-content h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin: 36px 0 12px;
}

/* ── Footer ── */
footer {
  margin-top: 80px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

footer a { color: var(--text-muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .container { padding: 0 16px; }

  nav .container {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links { gap: 20px; }

  .home-intro h1 { font-size: 24px; }

  .page-header h1,
  .post-header h1 { font-size: 26px; }

  .prose { font-size: 17px; }

  .prose h2 { font-size: 21px; }
}