/* ===== Variables ===== */
:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-subtle: #eff6ff;
  --accent-ring: rgba(37, 99, 235, 0.12);
  --border: #e2e8f0;
  --radius-sm: 0.375rem;
  --radius: 0.75rem;
  --max-width: 680px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", "Fira Code", Menlo, Consolas, monospace;
  --accent-glow: rgba(37, 99, 235, 0.35);
  --grid-line: rgba(37, 99, 235, 0.05);
}

/* ===== Dark Mode ===== */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #0f172a;
    --surface: #1e293b;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --accent: #60a5fa;
    --accent-dark: #93c5fd;
    --accent-subtle: rgba(59, 130, 246, 0.1);
    --accent-ring: rgba(96, 165, 250, 0.15);
    --border: #334155;
    --accent-glow: rgba(96, 165, 250, 0.4);
    --grid-line: rgba(96, 165, 250, 0.07);
  }
}

html[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #60a5fa;
  --accent-dark: #93c5fd;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --accent-ring: rgba(96, 165, 250, 0.15);
  --border: #334155;
  --accent-glow: rgba(96, 165, 250, 0.4);
  --grid-line: rgba(96, 165, 250, 0.07);
}

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

/* ===== Base ===== */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}

a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

/* ===== Header ===== */
.site-header {
  position: relative;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}

.avatar {
  display: block;
  width: 112px;
  height: 112px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  box-shadow: 0 0 0 4px var(--accent-ring), 0 0 28px var(--accent-glow);
  margin: 0 auto 1.25rem;
}

.site-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.35rem;
}

.header-tagline {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 400;
}

.header-tagline::before {
  content: "> ";
  color: var(--accent);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0.4rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px -3px var(--accent-glow);
}

.icon-sun { display: none; }
.icon-moon { display: block; }

html[data-theme="dark"] .icon-sun { display: block; }
html[data-theme="dark"] .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .icon-sun { display: block; }
  html:not([data-theme="light"]) .icon-moon { display: none; }
}

/* ===== Nav ===== */
.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-nav a {
  display: block;
  padding: 0.75rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
  box-shadow: 0 1px 10px -2px var(--accent-glow);
  text-decoration: none;
}

/* ===== Main ===== */
main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

/* ===== Sections ===== */
section {
  margin-bottom: 2.5rem;
}

section + section {
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

h2 {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.section-label {
  font-family: var(--font-mono);
}

.section-label::before {
  content: "// ";
  color: var(--accent);
  opacity: 0.8;
}

p {
  color: var(--text);
}

p + p {
  margin-top: 0.85rem;
}

/* ===== Social / Link Buttons ===== */
.link-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
  list-style: none;
}

.link-grid a {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.65rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s, color 0.15s;
}

.link-grid a:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring), 0 0 18px -4px var(--accent-glow);
  text-decoration: none;
}

.link-grid svg {
  flex-shrink: 0;
  opacity: 0.75;
}

/* ===== Blog Listing ===== */
.post-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  transition: border-color 0.15s, box-shadow 0.15s;
  margin-bottom: 1.25rem;
}

.post-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px -6px var(--accent-glow);
}

.post-card-cover {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.post-card-cover-link {
  display: block;
  line-height: 0;
}

.post-card-body {
  padding: 1.25rem 1.5rem;
}

.post-card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0.2rem 0 0.5rem;
  line-height: 1.4;
}

.post-card-body h3 a {
  color: var(--text);
  text-decoration: none;
}

.post-card-body h3 a:hover {
  color: var(--accent);
}

.post-card-body p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ===== Post meta (date) ===== */
.post-meta {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ===== Individual Post ===== */
.post-cover {
  display: block;
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 2rem;
}

.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-top: 0.5rem;
  color: var(--text);
}

/* ===== Post prose body ===== */
.post-body {
  font-size: 1rem;
  line-height: 1.8;
}

.post-body > * + * { margin-top: 1.25rem; }

.post-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-transform: none;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

.post-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  text-transform: none;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

.post-body h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-transform: none;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
}

.post-body p { color: var(--text); }

.post-body ul,
.post-body ol {
  padding-left: 1.5rem;
}

.post-body li + li { margin-top: 0.35rem; }

.post-body a { color: var(--accent); }
.post-body a:hover { color: var(--accent-dark); }

.post-body strong { color: var(--text); }

.post-body img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.post-body blockquote {
  border-left: 3px solid var(--border);
  padding: 0.25rem 0 0.25rem 1.25rem;
  color: var(--muted);
  font-style: italic;
}

/* Inline code */
.post-body code {
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  font-size: 0.85em;
  background: var(--accent-subtle);
  color: var(--accent-dark);
  padding: 0.15em 0.4em;
  border-radius: 0.25rem;
}

/* Fenced code blocks */
.post-body pre {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
}

html[data-theme="dark"] .post-body pre {
  background: #0f172a;
  border: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .post-body pre {
    background: #0f172a;
    border: 1px solid var(--border);
  }
}

.post-body pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* Alert boxes (converted from Hugo shortcodes) */
aside.alert {
  background: var(--accent-subtle);
  border: 1px solid #bfdbfe;
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.875rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text);
}

html[data-theme="dark"] aside.alert {
  border-color: #1e3a5f;
  border-left-color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) aside.alert {
    border-color: #1e3a5f;
    border-left-color: var(--accent);
  }
}

aside.alert-tip {
  background: #f0fdf4;
  border-color: #bbf7d0;
  border-left-color: #16a34a;
}

html[data-theme="dark"] aside.alert-tip {
  background: rgba(22, 163, 74, 0.08);
  border-color: #14532d;
  border-left-color: #16a34a;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) aside.alert-tip {
    background: rgba(22, 163, 74, 0.08);
    border-color: #14532d;
    border-left-color: #16a34a;
  }
}

.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

/* ===== Project Cards ===== */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  list-style: none;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px -6px var(--accent-glow);
}

.project-card strong {
  display: block;
  font-size: 0.975rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  background: var(--accent-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s, color 0.15s, background 0.15s;
}

.project-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-ring), 0 0 18px -4px var(--accent-glow);
  text-decoration: none;
}

.project-links svg {
  flex-shrink: 0;
  opacity: 0.8;
}

/* ===== Footer ===== */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .site-header {
    padding: 2rem 1rem 1.5rem;
  }

  .site-header h1 {
    font-size: 1.6rem;
  }

  main {
    padding: 2rem 1rem;
  }

  .link-grid {
    grid-template-columns: 1fr;
  }
}