/* ===========================================================================
   Midnight Python palette + hand-written styles (no Tailwind, no build step).
   Dark mode is driven by the `dark` class on <html> (toggled by the app).
   =========================================================================== */

:root {
  --page: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --hover: rgba(15, 23, 42, 0.04);
  --tag-text: #854d0e;
  --tag-bg: rgba(250, 204, 21, 0.1);
  --tag-border: rgba(202, 138, 4, 0.3);
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.1), 0 4px 10px -3px rgba(15, 23, 42, 0.05);
  --shadow-accent: 0 10px 25px -5px rgba(37, 99, 235, 0.18), 0 4px 10px -3px rgba(37, 99, 235, 0.1);
  --card-hover-border: var(--accent);
  --radius: 0.5rem;
  --radius-lg: 0.875rem;
  --container: 56rem;
}

html.dark {
  --page: #0f172a;
  --surface: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-contrast: #082f49;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --hover: rgba(255, 255, 255, 0.06);
  --tag-text: #fbbf24;
  --tag-bg: rgba(250, 204, 21, 0.1);
  --tag-border: rgba(250, 204, 21, 0.3);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 4px 10px -3px rgba(0, 0, 0, 0.3);
  --shadow-accent: 0 10px 25px -5px rgba(250, 204, 21, 0.28), 0 4px 10px -3px rgba(250, 204, 21, 0.15);
  --card-hover-border: #facc15;
}

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

html,
body {
  height: 100%;
}

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--page);
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* ---- App shell ---------------------------------------------------------- */
.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
  overflow-y: auto;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding: 2.5rem 2rem;
  }
}

/* ---- Sidebar ------------------------------------------------------------ */
.sidebar {
  width: 16rem;
  flex-shrink: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-right: 1px solid var(--border);
  transition: width 0.3s ease;
}

.sidebar--collapsed {
  width: 4rem;
}

.sidebar-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.icon-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background-color 0.15s ease;
}

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

.nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: none;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.nav-link:hover {
  background: var(--hover);
}

.nav-link i {
  width: 1.25rem;
  text-align: center;
  font-size: 1rem;
}

.nav-link--active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.nav-foot {
  margin-top: auto;
  padding: 0.75rem;
}

.sidebar--collapsed .nav-link {
  justify-content: center;
}

.sidebar--collapsed .nav-link i {
  width: auto;
}

/* ---- Footer ------------------------------------------------------------- */
.footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.footer-links {
  display: flex;
  gap: 1rem;
  font-size: 1.1rem;
}

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

/* ---- Headings / intro --------------------------------------------------- */
.page-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-intro {
  margin: 0.5rem 0 2rem;
  max-width: 42rem;
  color: var(--muted);
}

/* ---- Cards / post list -------------------------------------------------- */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.post-list .card:hover,
.grid-2 .card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--card-hover-border);
}

@media (min-width: 768px) {
  .card {
    padding: 2rem;
  }
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.post-meta i {
  margin-right: 0.4rem;
}

.post-title-link {
  display: block;
  margin-top: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.25;
  transition: color 0.15s ease;
}

@media (min-width: 768px) {
  .post-title-link {
    font-size: 1.875rem;
  }
}

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

.post-excerpt {
  margin-top: 0.75rem;
  line-height: 1.7;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 0.25rem;
  color: var(--tag-text);
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
}

.card-foot {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
}

.read-link,
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  color: var(--accent);
}

.read-link i,
.back-link i {
  transition: transform 0.2s ease;
}

.read-link:hover i {
  transform: translateX(3px);
}

.back-link:hover i {
  transform: translateX(-3px);
}

.read-link:hover,
.back-link:hover {
  text-decoration: underline;
}

.back-link {
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

/* ---- Single post -------------------------------------------------------- */
.post-header {
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-h1 {
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.2;
}

@media (min-width: 768px) {
  .post-h1 {
    font-size: 2.25rem;
  }
}

.byline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.byline i {
  margin-right: 0.4rem;
}

/* ---- Prev / next nav ---------------------------------------------------- */
.postnav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

@media (min-width: 640px) {
  .postnav {
    grid-template-columns: repeat(3, 1fr);
  }
}

.postnav-card {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.postnav-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
  border-color: var(--card-hover-border);
}

.postnav-card--all {
  align-items: center;
  justify-content: center;
  flex-direction: row;
  gap: 0.5rem;
  color: var(--accent);
  font-weight: 500;
}

.postnav-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.postnav-label i {
  margin: 0 0.4rem;
}

.postnav-title {
  margin-top: 0.25rem;
  font-weight: 500;
}

.postnav-card--right {
  text-align: right;
}

.postnav-empty {
  display: none;
}

@media (min-width: 640px) {
  .postnav-empty {
    display: block;
  }
}

/* ---- Projects / about --------------------------------------------------- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.card-body {
  margin-top: 0.5rem;
  line-height: 1.7;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: underline;
}

.about-h1 {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .about-h1 {
    font-size: 2.25rem;
  }
}

.about-bio {
  margin-top: 1.5rem;
  max-width: 48rem;
  line-height: 1.8;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill {
  font-size: 0.875rem;
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  background: var(--hover);
}

.list {
  margin: 0;
  padding-left: 1.25rem;
  list-style: disc;
}

.list li {
  margin: 0.4rem 0;
}

.muted {
  color: var(--muted);
}

.section-gap {
  margin-top: 2.5rem;
}

/* ---- 404 ---------------------------------------------------------------- */
.notfound-code {
  font-size: 3rem;
  font-weight: 700;
}

/* ---- Boot splash -------------------------------------------------------- */
.splash {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: var(--page);
  color: var(--text);
}

.spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 4px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.splash p {
  font-size: 0.875rem;
  color: var(--muted);
}

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

/* ---- Rendered markdown -------------------------------------------------- */
.markdown-content {
  font-size: 1.0625rem;
  line-height: 1.8;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  font-weight: 700;
  line-height: 1.25;
  margin: 1.6em 0 0.6em;
}
.markdown-content h1 {
  font-size: 1.875rem;
}
.markdown-content h2 {
  font-size: 1.5rem;
}
.markdown-content h3 {
  font-size: 1.25rem;
}
.markdown-content h4 {
  font-size: 1.1rem;
}

.markdown-content p {
  margin: 0 0 1rem;
}

.markdown-content a {
  color: var(--accent);
  text-decoration: underline;
  font-weight: 500;
}

.markdown-content ul,
.markdown-content ol {
  margin: 0 0 1rem 1.5rem;
}
.markdown-content ul {
  list-style: disc;
}
.markdown-content ol {
  list-style: decimal;
}
.markdown-content li {
  margin: 0.25rem 0;
}

.markdown-content blockquote {
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
  margin: 0 0 1rem;
  color: var(--muted);
  font-style: italic;
}

.markdown-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--hover);
  padding: 0.15em 0.35em;
  border-radius: 0.25rem;
}

.markdown-content pre {
  background: var(--hover);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 0 0 1rem;
}
.markdown-content pre code {
  background: none;
  padding: 0;
}

.markdown-content img {
  border-radius: var(--radius);
  margin: 0.5rem 0;
}

.markdown-content hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1rem;
}
.markdown-content th,
.markdown-content td {
  border: 1px solid var(--border);
  padding: 0.5rem;
  text-align: left;
}
