:root {
  --font-display: 'VT323', ui-monospace, 'JetBrains Mono', monospace;
  --font-body: 'Source Serif 4', 'Source Serif Pro', 'Iowan Old Style', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'Consolas', monospace;
  --font-heading: var(--font-display);

  --bg: #fafaf5;
  --bg-surface: #f3f1e8;
  --bg-surface-hover: #ece9dc;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-mute: #7a7a78;
  --rule: #1a1a1a;
  --rule-soft: rgba(26, 26, 26, 0.16);
  --paper-rule: rgba(26, 26, 26, 0.08);

  --blueprint: #3553ff;
  --blueprint-tint: rgba(53, 83, 255, 0.08);
  --blueprint-tint-strong: rgba(53, 83, 255, 0.18);

  --status-complete: #3553ff;
  --status-in-progress: #4a4a4a;
  --status-planned: #b8b6ad;
  --warn: #b8870f;

  --code-bg: #efece0;
  --modal-bg: #fafaf5;
  --overlay-bg: rgba(26, 26, 26, 0.55);
  --header-bg: rgba(250, 250, 245, 0.94);

  --header-offset: 92px;

  --text: var(--ink);
  --text-muted: var(--ink-soft);
  --border: var(--rule-soft);
  --accent: var(--blueprint);
  --accent-hover: #2840d6;
  --secondary: var(--blueprint);
  --complete: var(--status-complete);
  --planned: var(--status-planned);
  --shadow-color: var(--ink);
  --shadow-hard: 3px 3px 0 var(--ink);
  --shadow-hard-lg: 5px 5px 0 var(--ink);
  --dot-color: var(--paper-rule);
}

[data-theme="dark"] {
  --bg: #0a0d1a;
  --bg-surface: #131830;
  --bg-surface-hover: #1b2244;
  --ink: #e8e6dc;
  --ink-soft: #a8a6a0;
  --ink-mute: #7a7878;
  --rule: #e8e6dc;
  --rule-soft: rgba(232, 230, 220, 0.18);
  --paper-rule: rgba(232, 230, 220, 0.08);

  --blueprint: #6b8eff;
  --blueprint-tint: rgba(107, 142, 255, 0.12);
  --blueprint-tint-strong: rgba(107, 142, 255, 0.22);

  --status-complete: #6b8eff;
  --status-in-progress: #c8c6c0;
  --status-planned: #4a4a48;
  --warn: #d4a83d;

  --code-bg: #131830;
  --modal-bg: #0f1424;
  --overlay-bg: rgba(10, 13, 26, 0.78);
  --header-bg: rgba(10, 13, 26, 0.94);

  --accent-hover: #8aa5ff;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.62;
  color: var(--ink);
  background-color: var(--bg);
  background-image: radial-gradient(var(--paper-rule) 1px, transparent 1px);
  background-size: 16px 16px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  hyphens: auto;
  -webkit-hyphens: auto;
  transition: background-color 0.2s, color 0.2s;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--blueprint);
}

h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2.6vw, 1.6rem); }
h4 { font-size: 1.1rem; }

p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.62;
  color: var(--ink);
}

a {
  color: var(--blueprint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}

a:hover {
  border-bottom-color: var(--blueprint);
}

code, pre, kbd, samp {
  font-family: var(--font-mono);
}

::selection {
  background: var(--blueprint);
  color: var(--bg);
}

.ascii-rule {
  display: block;
  width: 100%;
  height: 6px;
  margin: 32px 0;
  background-image:
    repeating-linear-gradient(
      to right,
      var(--blueprint) 0,
      var(--blueprint) 4px,
      transparent 4px,
      transparent 8px
    ),
    repeating-linear-gradient(
      to right,
      transparent 0,
      transparent 8px,
      var(--blueprint-tint-strong) 8px,
      var(--blueprint-tint-strong) 14px
    );
  background-size: 100% 3px, 100% 3px;
  background-position: 0 0, 0 3px;
  background-repeat: no-repeat;
  user-select: none;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.fig-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blueprint);
}

.dropcap > p:first-of-type::first-letter,
p.dropcap::first-letter {
  font-family: var(--font-display);
  float: left;
  font-size: 4.2rem;
  line-height: 0.85;
  padding: 0.08em 0.12em 0 0;
  color: var(--blueprint);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.6rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink);
  border-bottom: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.logo:hover {
  color: var(--blueprint);
  border-bottom: none;
}

.logo-icon {
  display: inline-block;
  width: 12px;
  height: 12px;
  background: var(--blueprint);
}

.header-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.header-nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: none;
}

.header-nav a:hover {
  color: var(--blueprint);
  border-bottom: none;
}

.header-github {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--rule-soft);
  background: var(--bg-surface);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-transform: uppercase;
  transition: border-color 0.15s, color 0.15s;
}

.header-github:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
  border-bottom: 1px solid var(--blueprint);
}

.header-github svg {
  flex-shrink: 0;
}

.header-github .star-icon {
  color: var(--blueprint);
}

.header-github .star-count {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--ink);
  min-width: 1ch;
}

.header-github .star-count[data-loading="true"] {
  opacity: 0.4;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--rule-soft);
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--ink);
  transition: border-color 0.15s, color 0.15s;
}

.theme-toggle:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 10px 20px;
  border: 1px solid var(--ink);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  display: inline-block;
  text-align: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--ink);
  color: var(--bg);
  border-bottom: 1px solid var(--ink);
}

.btn-primary {
  background: var(--blueprint);
  color: var(--bg);
  border-color: var(--blueprint);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
  border-color: var(--accent-hover);
  border-bottom: 1px solid var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.btn-secondary:hover {
  background: var(--ink);
  color: var(--bg);
  border-bottom: 1px solid var(--ink);
}

.section {
  padding: 80px 0;
  border-top: 1px solid var(--rule-soft);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  text-align: left;
  text-transform: uppercase;
  color: var(--blueprint);
  margin-bottom: 8px;
}

.section-subtitle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 40px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  position: relative;
  background: var(--modal-bg);
  border: 1px solid var(--ink);
  width: 100%;
  max-width: 760px;
  max-height: 86vh;
  overflow-y: auto;
  padding: 36px 32px 28px;
  transform: translateY(16px);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--ink-mute);
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: var(--blueprint);
}

.modal-header {
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule-soft);
}

.modal-phase-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blueprint);
  margin-bottom: 6px;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 8px;
}

.modal-desc {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.5;
}

.modal-progress {
  margin-top: 14px;
  padding: 6px 10px;
  background: var(--blueprint-tint);
  border: 1px solid var(--blueprint);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blueprint);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.modal-progress-count {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.modal-progress-pct {
  margin-left: auto;
  padding: 2px 8px;
  background: var(--blueprint);
  color: var(--bg);
  font-size: 0.7rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.modal-progress-bar {
  margin-top: 10px;
  height: 4px;
  background: var(--rule-soft);
  overflow: hidden;
}

.modal-progress-bar-fill {
  height: 100%;
  background: var(--blueprint);
  transition: width 0.4s ease;
  width: 0%;
}

.modal-footer {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--rule-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.modal-footer-note {
  color: var(--ink-mute);
}

.modal-reset {
  background: transparent;
  border: 1px solid var(--rule-soft);
  color: var(--ink-mute);
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.modal-reset:hover {
  color: var(--blueprint);
  border-color: var(--blueprint);
}

.modal-lessons {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.modal-lesson {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto auto auto auto;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.modal-lesson:last-child {
  border-bottom: none;
}

.modal-lesson:hover {
  background: var(--blueprint-tint);
}

.modal-lesson > a {
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.96rem;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.modal-lesson > a:hover {
  color: var(--blueprint);
  border-bottom-color: var(--blueprint);
}

.modal-lesson-status {
  width: 12px;
  height: 12px;
  border: 1px solid var(--ink);
  background: transparent;
}

.modal-lesson-status.complete {
  background: var(--blueprint);
  border-color: var(--blueprint);
}

.modal-lesson-status.in-progress {
  background: linear-gradient(135deg, var(--blueprint) 0%, var(--blueprint) 50%, transparent 50%, transparent 100%);
  border-color: var(--blueprint);
}

.modal-lesson-status.planned {
  background: transparent;
  border-style: dashed;
  border-color: var(--ink-mute);
}

.modal-lesson-lang {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  min-width: 80px;
  text-align: right;
}

.modal-lesson-type {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 3px 8px;
  background: transparent;
  border: 1px solid var(--rule-soft);
  color: var(--ink-mute);
  min-width: 56px;
  text-align: center;
}

.modal-lesson-type[data-type="Build"] {
  color: var(--blueprint);
  border-color: var(--blueprint);
}

.modal-lesson-type[data-type="Learn"] {
  color: var(--ink);
  border-color: var(--ink);
}

.modal-lesson-type[data-type="Capstone"] {
  color: var(--warn);
  border-color: var(--warn);
}

.modal-lesson .modal-lesson-read {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--rule-soft);
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}

.modal-lesson .modal-lesson-read:hover {
  color: var(--blueprint);
  border-color: var(--blueprint);
  border-bottom: 1px solid var(--blueprint);
}

.modal-lesson-read-placeholder {
  display: inline-block;
  width: 64px;
  height: 1px;
}

.modal-lesson-toggle {
  width: 22px;
  height: 22px;
  border: 1px solid var(--rule-soft);
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  padding: 0;
}

.modal-lesson-toggle:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.modal-lesson-toggle.done {
  background: var(--blueprint);
  border-color: var(--blueprint);
  color: var(--bg);
}

.copy-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  cursor: pointer;
  padding: 2px 6px;
  color: var(--ink-mute);
  transition: color 0.15s;
}

.copy-btn:hover {
  color: var(--blueprint);
}

.site-footer {
  border-top: 1px solid var(--rule-soft);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-inner p {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: none;
}

.footer-links a:hover {
  color: var(--blueprint);
  border-bottom: none;
}

.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal {
  transition:
    opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms);
  will-change: opacity, transform;
}

body.js-anim .reveal {
  opacity: 0;
  transform: translateY(20px);
}

body.js-anim .reveal--left {
  transform: translateX(-20px);
}

body.js-anim .reveal.in-view {
  opacity: 1;
  transform: none;
}

.ascii-rule {
  transition: clip-path 1.1s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms);
}

body.js-anim .ascii-rule {
  clip-path: inset(0 100% 0 0);
}

body.js-anim .ascii-rule.in-view {
  clip-path: inset(0 0 0 0);
}

.toc-row {
  transition:
    opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms),
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms),
    background 0.15s;
}

body.js-anim .toc-row {
  opacity: 0;
  transform: translateY(8px);
}

body.js-anim .toc-row.in-view {
  opacity: 1;
  transform: none;
}

@keyframes title-flicker {
  0%, 100% { opacity: 1; }
  18% { opacity: 0.4; }
  20% { opacity: 1; }
  62% { opacity: 0.7; }
  64% { opacity: 1; }
}

.manual-title {
  animation: title-flicker 2.4s ease-out 0.1s 1;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .ascii-rule,
  .toc-row,
  .stat-row-bar::before,
  .manual-title {
    transition: none !important;
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
  }
}

@media (max-width: 1024px) {
  .container {
    padding: 0 24px;
  }
}

@media (max-width: 768px) {
  .header-nav a:not(.header-github) {
    display: none;
  }

  .header-inner {
    height: 56px;
    padding: 0 12px;
    gap: 8px;
  }

  .logo {
    font-size: 1.2rem;
    gap: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 1;
    min-width: 0;
  }

  .header-nav {
    gap: 8px;
    flex-shrink: 0;
  }

  .header-github {
    padding: 4px 8px;
    font-size: 0.7rem;
    gap: 4px;
  }

  .theme-toggle {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
  }

  .container {
    padding: 0 16px;
  }

  .section {
    padding: 48px 0;
  }

  .btn {
    width: 100%;
    max-width: 320px;
  }

  .modal {
    padding: 24px 18px;
    max-width: 100%;
  }

  .modal-lesson {
    grid-template-columns: 12px minmax(0, 1fr) auto auto auto auto;
    column-gap: 8px;
    padding: 10px 0;
    font-size: 0.88rem;
  }

  .modal-lesson-lang {
    min-width: 0;
    font-size: 0.62rem;
  }

  .modal-lesson-type {
    min-width: 0;
    padding: 2px 6px;
    font-size: 0.58rem;
  }

  .modal-lesson .modal-lesson-read {
    padding: 3px 8px;
    font-size: 0.66rem;
  }

  .modal-lesson-read-placeholder {
    width: 48px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    padding: 0 10px;
    gap: 6px;
  }

  .logo {
    font-size: 1rem;
    letter-spacing: 0.02em;
  }

  .logo-icon {
    width: 10px;
    height: 10px;
  }

  .header-github {
    padding: 3px 6px;
    font-size: 0.65rem;
  }

  .header-github .star-count {
    font-size: 0.7rem;
  }

  .theme-toggle {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }
}

@media (min-width: 1440px) {
  .container {
    max-width: 1240px;
  }
}