:root {
  --bg: #eef2f5;
  --panel: #ffffff;
  --panel-soft: #edf2f7;
  --text: #111827;
  --muted: #475467;
  --line: rgba(17, 24, 39, 0.18);
  --accent: #0f766e;
  --accent-soft: rgba(15, 118, 110, 0.12);
  --shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
  --radius: 1rem;
  --focus-ring: 0 0 0 3px rgba(15, 118, 110, 0.18);
}

[data-theme="dark"] {
  --bg: #090b0d;
  --panel: #101417;
  --panel-soft: #0c1013;
  --text: #edf2f7;
  --muted: #b7c1cd;
  --line: rgba(237, 242, 247, 0.18);
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.14);
  --shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
  --focus-ring: 0 0 0 3px rgba(56, 189, 248, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.12), transparent 36%),
    var(--bg);
  color: var(--text);
  font-family: "SF Pro Display", "Segoe UI", "Helvetica Neue", sans-serif;
  line-height: 1.6;
}

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

p,
li {
  color: var(--muted);
}

.page-shell {
  width: min(100%, 78rem);
  margin: 0 auto;
  padding: 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  width: min(100%, 68rem);
  margin: 0 auto;
  padding: 0.25rem 0 0.65rem;
  backdrop-filter: blur(14px);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.35rem 0;
}

.nav-links a,
.theme-toggle,
.eyebrow {
  font-family: "JetBrains Mono", "SFMono-Regular", ui-monospace, monospace;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 0.2rem;
}

.nav-links a,
.theme-toggle {
  font-size: 0.82rem;
  color: var(--text);
}

.nav-links a {
  min-height: 2.5rem;
  padding: 0.55rem 0.7rem;
  border-radius: 999px;
}

.nav-links a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.42em;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  margin-left: 0.1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  flex: 0 0 auto;
}

.theme-icon {
  width: 1rem;
  height: 1rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-icon-dark {
  display: none;
}

[data-theme="dark"] .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: inline;
}

.site-main {
  width: min(100%, 68rem);
  margin: 0 auto;
}

.page-about .site-main {
  width: min(100%, 760px);
}

.site-footer {
  width: min(100%, 68rem);
  margin: 4rem auto 1rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.hero {
  display: grid;
  gap: 1.5rem;
  width: min(100%, 48rem);
  margin: 0 auto;
  padding: 2rem 0 1.5rem;
}

.hero-photo-wrap {
  width: 8rem;
  height: 8rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  box-shadow: var(--shadow);
}

.hero-photo {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center 24%;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--text);
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

h3 {
  font-size: 1rem;
}

.lead {
  margin: 1rem 0 0;
  font-size: 1.04rem;
  max-width: 66ch;
}

.hero p,
.section-copy,
.entry-summary,
.prose p,
.prose ul,
.row-note {
  max-width: 66ch;
}

.hero-meta {
  display: grid;
  gap: 0.65rem;
  margin-top: 1rem;
}

.hero-meta p {
  margin: 0;
}

.hero-actions {
  margin-top: 1.5rem;
}

.button-row,
.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.72rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: var(--shadow);
  color: var(--text);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.button-link:hover,
.theme-toggle:hover,
.nav-links a:hover {
  color: var(--text);
}

.button-link:hover,
.theme-toggle:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.contact-links {
  gap: 0.9rem;
}

.contact-link {
  gap: 0.7rem;
}

.contact-icon {
  width: 1.05rem;
  height: 1.05rem;
  display: block;
  fill: currentColor;
}

.contact-meta {
  display: grid;
  gap: 0.2rem;
  margin-top: 1.25rem;
}

.contact-meta p {
  margin: 0;
}

.section-actions {
  margin-top: 1.25rem;
}

.section-block,
.page-block {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
}

.contact-block {
  padding-top: 1.5rem;
}

.section-heading {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.section-copy {
  margin: 0;
}

.entry-grid,
.stack-grid {
  display: grid;
  gap: 1.5rem;
}

.grouped-courses {
  position: relative;
}

.grouped-courses::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 0;
  border-radius: calc(var(--radius) + 0.2rem);
  pointer-events: none;
}

.grouped-courses > * {
  position: relative;
}

.grouped-courses .entry-card {
  border: 0;
  box-shadow: none;
}

.grouped-courses .course-card-top {
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line));
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 7%, var(--panel)), var(--panel));
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.05);
}

.grouped-courses .course-card-top .entry-kicker {
  color: color-mix(in srgb, var(--accent) 58%, var(--muted));
}

.grouped-courses .course-card-top .entry-status {
  border-color: color-mix(in srgb, var(--accent) 24%, var(--line));
  background: color-mix(in srgb, var(--accent) 9%, var(--panel-soft));
}

.entry-card,
.stack-group,
.focus-list li,
.list-row {
  display: grid;
  align-content: start;
  gap: 0.7rem;
  padding: 1rem 1rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  box-shadow: var(--shadow);
}

.focus-list li {
  gap: 0.5rem;
  padding: 0.9rem 0.95rem 0.85rem;
}

.entry-card.compact {
  min-height: 100%;
}

.entry-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0;
}

.entry-kicker,
.entry-status {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

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

.entry-status {
  padding: 0.22rem 0.55rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--text);
}

.status-in-progress {
  background: rgba(37, 99, 235, 0.18);
  color: #1e40af;
}

.status-active,
.status-ongoing-practice {
  background: rgba(15, 118, 110, 0.18);
  color: #115e59;
}

.status-completed {
  background: rgba(71, 85, 105, 0.2);
  color: #334155;
}

.entry-card h3 a {
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.2em;
}

.entry-card h3 a:hover,
.inline-links a:hover {
  text-decoration-color: currentColor;
}

.entry-summary {
  margin: 0;
}

.tag-list,
.focus-list,
.stack-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.home-tag-list {
  margin-top: 0.35rem;
}

.tag-list li {
  display: inline-flex;
  align-items: center;
  min-height: 1.8rem;
  padding: 0.22rem 0.56rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 10%, var(--panel-soft));
  color: var(--text);
  font-size: 0.76rem;
}

.inline-links {
  margin-top: 1rem;
}

.inline-links a {
  font-size: 0.92rem;
  color: var(--text);
}

.focus-list {
  display: grid;
  gap: 1rem;
}

.focus-list li {
  border-left-width: 3px;
}

.focus-list li:nth-child(1) {
  border-left-color: #2563eb;
}

.focus-list li:nth-child(2) {
  border-left-color: #0f766e;
}

.focus-list li:nth-child(3) {
  border-left-color: #ea580c;
}

.focus-list li:nth-child(4) {
  border-left-color: #7c3aed;
}

.focus-list li h3,
.stack-group h3,
.list-row h3 {
  margin-bottom: 0.2rem;
}

.focus-list li p,
.stack-list li,
.list-row p {
  margin: 0;
}

.stack-group h3 {
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stack-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.stack-list li {
  padding: 0.36rem 0.62rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel-soft) 88%, transparent);
  color: color-mix(in srgb, var(--text) 78%, var(--muted));
  font-size: 0.84rem;
}

[data-theme="dark"] .entry-status {
  border-color: color-mix(in srgb, var(--accent) 44%, var(--line));
  background: color-mix(in srgb, var(--accent) 13%, var(--panel-soft));
  color: color-mix(in srgb, white 88%, var(--accent));
}

[data-theme="dark"] .grouped-courses .course-card-top {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--line));
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 12%, var(--panel)), var(--panel));
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.24);
}

[data-theme="dark"] .stack-group {
  border-color: color-mix(in srgb, var(--accent) 30%, var(--line));
  background: color-mix(in srgb, var(--panel) 90%, var(--accent-soft));
}

[data-theme="dark"] .stack-group h3 {
  color: color-mix(in srgb, white 84%, var(--accent));
}

[data-theme="dark"] .stack-list li {
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
  background: color-mix(in srgb, var(--accent) 10%, var(--panel-soft));
  color: color-mix(in srgb, white 82%, var(--accent));
}

[data-theme="dark"] .contact-link {
  border-color: color-mix(in srgb, var(--accent) 34%, var(--line));
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
}

[data-theme="dark"] .contact-link:hover,
[data-theme="dark"] .contact-link:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--line));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 28%, transparent), var(--shadow);
}

.page-intro {
  padding: 2.5rem 0 1.5rem;
}

.detail-meta {
  display: grid;
  gap: 0.6rem;
}

.detail-meta p {
  display: flex;
  gap: 0.75rem;
  margin: 0;
}

.detail-meta span {
  min-width: 4.5rem;
  color: var(--text);
}

.detail-section {
  padding-top: 2rem;
}

.detail-section h2 {
  margin-bottom: 0.9rem;
}

.prose p,
.prose ul,
.prose h2 {
  margin: 0 0 1rem;
}

.prose ul {
  padding-left: 1.1rem;
}

.prose h2 {
  font-size: 1rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--muted);
}

[data-theme="dark"] .page-about .prose h2 {
  color: color-mix(in srgb, white 82%, var(--accent));
}

.prose p:last-child,
.prose ul:last-child {
  margin-bottom: 0;
}

.list-row {
  gap: 0.4rem;
}

.row-note {
  font-size: 0.95rem;
}

a:focus-visible,
button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

@media (min-width: 760px) {
  .entry-grid.two-up,
  .stack-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 1rem;
  }

  .site-nav {
    gap: 0.25rem;
  }

  .nav-links {
    gap: 0.15rem;
  }

  .nav-links a {
    padding-inline: 0.55rem;
  }
}