@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;600&display=swap");

:root {
  --primary: #0f62fe;
  --primary-hover: #0353e9;
  --primary-pressed: #002d9c;
  --canvas: #ffffff;
  --surface-1: #f4f4f4;
  --surface-2: #e0e0e0;
  --ink: #161616;
  --ink-muted: #525252;
  --ink-subtle: #8c8c8c;
  --hairline: #e0e0e0;
  --hairline-strong: #161616;
  --inverse-canvas: #161616;
  --inverse-surface-1: #262626;
  --inverse-ink: #ffffff;
  --inverse-ink-muted: #c6c6c6;
  --semantic-error: #da1e28;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;
  --max-width: 1584px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.16px;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 400;
}

a:hover { text-decoration: underline; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 48px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 48px;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.brand {
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--ink);
  font-size: 16px;
  font-weight: 400;
  white-space: nowrap;
}

.brand:hover { text-decoration: none; }

.brand-mark {
  width: 28px;
  height: 28px;
  object-fit: contain;
  background: var(--ink);
  border: 1px solid var(--hairline);
  padding: 2px;
}

.brand-x { color: var(--primary); }

.search-pill {
  height: 48px;
  min-width: 280px;
  margin-left: auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  background: var(--surface-1);
  color: var(--ink-muted);
  border-left: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
  font-size: 14px;
  line-height: 1.29;
}

.nav-links {
  min-height: 48px;
  display: flex;
  align-items: stretch;
}

.nav-links a {
  min-height: 48px;
  display: flex;
  align-items: center;
  padding: 0 var(--space-md);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.29;
}

.nav-links a:hover {
  background: var(--surface-1);
  text-decoration: none;
}

.nav-cta,
.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #ffffff !important;
  padding: 12px 16px;
  font: inherit;
  font-size: 14px;
  line-height: 1.29;
  letter-spacing: 0.16px;
  cursor: pointer;
  text-decoration: none !important;
}

.nav-cta:hover,
.button:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  text-decoration: none;
}

.button:active,
.nav-cta:active {
  background: var(--primary-pressed);
  border-color: var(--primary-pressed);
}

.button.secondary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--inverse-ink) !important;
}

.button.secondary:hover {
  background: #393939;
  border-color: #393939;
}

.link-button {
  min-height: 48px;
  background: transparent;
  border: 0;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  padding: 0 var(--space-md);
}

.link-button:hover { background: var(--surface-1); }

.inline { display: inline; }

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl) var(--space-section);
}

.section-band {
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--hairline);
}

.section-heading {
  max-width: 920px;
  margin-bottom: var(--space-xl);
}

.section-heading p {
  max-width: 760px;
  color: var(--ink-muted);
  font-size: 18px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 var(--space-xs);
  background: var(--surface-1);
  color: var(--ink-muted);
  border: 1px solid var(--hairline);
  font-size: 12px;
  line-height: 1.33;
  letter-spacing: 0.32px;
}

.hero {
  padding: var(--space-section) 0 var(--space-xxl);
  max-width: 1056px;
}

.eyebrow {
  margin: 0 0 var(--space-lg);
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 1.29;
  font-weight: 400;
  letter-spacing: 0.16px;
}

h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.17;
  font-weight: 300;
  letter-spacing: -0.5px;
}

h2 {
  margin: 0 0 var(--space-lg);
  color: var(--ink);
  font-size: clamp(32px, 4vw, 60px);
  line-height: 1.17;
  font-weight: 300;
  letter-spacing: -0.4px;
}

h3 {
  margin: 0 0 var(--space-md);
  color: var(--ink);
  font-size: 24px;
  line-height: 1.33;
  font-weight: 400;
  letter-spacing: 0;
}

p { margin: 0 0 var(--space-lg); }

.hero p:not(.eyebrow) {
  max-width: 760px;
  margin-top: var(--space-lg);
  color: var(--ink);
  font-size: 20px;
  line-height: 1.4;
  letter-spacing: 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.content {
  max-width: 1056px;
  padding: var(--space-xxl);
  margin-bottom: var(--space-section);
  background: var(--canvas);
  border: 1px solid var(--hairline);
}

.content p {
  max-width: 820px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.5;
}

.grid {
  display: grid;
  gap: 0;
  margin-bottom: var(--space-section);
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid > div,
.panel,
.card,
.auth-panel {
  background: var(--canvas);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: var(--space-xl);
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.card {
  min-height: 220px;
  transition: background 120ms ease;
}

.card:hover { background: var(--surface-1); }

.card h3 { min-height: 64px; }

.card.compact h3 { min-height: auto; }

.question-panel,
.cta-panel {
  padding: var(--space-xxl);
  border: 1px solid var(--hairline);
  background: var(--surface-1);
  margin-bottom: var(--space-section);
}

.question-panel p {
  max-width: 1000px;
  color: var(--ink);
  font-size: clamp(24px, 3vw, 42px);
  line-height: 1.2;
  font-weight: 300;
  letter-spacing: 0;
}

.track-grid,
.roadmap-grid,
.output-grid,
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.track-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.output-grid,
.evidence-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.track-card,
.roadmap-card,
.output-card,
.evidence-card {
  padding: var(--space-lg);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--canvas);
}

.roadmap-card strong,
.output-card strong,
.evidence-card strong {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--ink);
  font-size: 20px;
  font-weight: 400;
}

.progress-list {
  display: grid;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.progress-item {
  display: grid;
  grid-template-columns: 180px 1fr 140px;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-md);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.progress-bar {
  height: 8px;
  background: var(--surface-2);
}

.progress-bar span {
  display: block;
  height: 8px;
  background: var(--primary);
}

.reading-controls {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, minmax(150px, 1fr));
  gap: var(--space-md);
  padding: var(--space-lg);
  border: 1px solid var(--hairline);
  background: var(--surface-1);
  margin-bottom: var(--space-xl);
}

.reading-card {
  border: 1px solid var(--hairline);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  background: var(--canvas);
}

.reading-card h3 {
  max-width: 920px;
}

.reading-meta,
.reading-status-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.reading-detail-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
  margin: var(--space-lg) 0;
}

.reading-detail-grid div {
  padding: var(--space-md);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.reading-detail-grid strong {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--ink);
  font-weight: 600;
}

.identity-list {
  display: grid;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.identity-list div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-md);
  padding: var(--space-md);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.identity-list strong { font-weight: 600; }

.blog-note {
  padding: var(--space-lg);
  border-left: 4px solid var(--primary);
  background: var(--surface-1);
  margin: var(--space-xl) 0;
}

.list {
  display: grid;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.list a {
  min-height: 64px;
  display: flex;
  align-items: center;
  padding: var(--space-md);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  color: var(--primary);
  background: var(--canvas);
}

.list a:hover {
  background: var(--surface-1);
  text-decoration: none;
}

.muted { color: var(--ink-muted); }
.error { color: var(--semantic-error); }

.auth-panel {
  max-width: 520px;
  margin: var(--space-section) auto;
  border: 1px solid var(--hairline);
}

.auth-panel h1 {
  font-size: clamp(42px, 6vw, 60px);
  margin-bottom: var(--space-lg);
}

.form {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

label {
  display: grid;
  gap: var(--space-xs);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.29;
}

input,
textarea,
select {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-bottom: 1px solid var(--hairline-strong);
  background: var(--surface-1);
  color: var(--ink);
  padding: 11px 16px;
  font: inherit;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
  border-bottom-color: var(--primary);
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin: var(--space-xl) 0;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.stats div {
  padding: var(--space-lg);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.stats strong {
  display: block;
  color: var(--ink);
  font-size: 42px;
  line-height: 1.2;
  font-weight: 300;
}

.stats span { color: var(--ink-muted); }

.task-row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--hairline);
}

.check {
  width: 32px;
  height: 32px;
  border: 1px solid var(--hairline-strong);
  background: var(--canvas);
  color: var(--canvas);
  cursor: pointer;
}

.check.done {
  background: var(--primary);
  border-color: var(--primary);
}

.file-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--hairline);
}

.site-footer {
  background: var(--inverse-canvas);
  color: var(--inverse-ink-muted);
  padding: 64px var(--space-xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 0;
}

.footer-inner > div {
  min-height: 180px;
  padding: 0 var(--space-lg) var(--space-lg);
  border-left: 1px solid var(--inverse-surface-1);
}

.footer-title {
  margin-bottom: var(--space-md);
  color: var(--inverse-ink);
  font-size: 16px;
  font-weight: 400;
}

.footer-inner p,
.footer-inner a {
  color: var(--inverse-ink-muted);
  font-size: 14px;
  line-height: 1.5;
}

.footer-inner a:hover { color: var(--inverse-ink); }

.footer-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-list li { margin-bottom: var(--space-xs); }

@media (max-width: 1056px) {
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { grid-template-columns: repeat(2, 1fr); }
  .search-pill { display: none; }
  .track-grid,
  .roadmap-grid,
  .output-grid,
  .evidence-grid,
  .reading-detail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reading-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 672px) {
  .nav-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 0;
    gap: 0;
  }

  .brand {
    min-width: 0;
    padding: 0 var(--space-md);
    border-bottom: 1px solid var(--hairline);
  }

  .brand span {
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-links {
    grid-column: 1 / -1;
    width: 100%;
    overflow-x: auto;
    border-bottom: 1px solid var(--hairline);
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a,
  .nav-cta,
  .link-button {
    min-height: 48px;
    white-space: nowrap;
  }

  .nav-cta {
    grid-column: 2;
    grid-row: 1;
    border-top: 0;
    border-right: 0;
    border-bottom: 1px solid var(--hairline);
  }

  .page { padding: 0 var(--space-md) var(--space-section); }
  .hero { padding: var(--space-xl) 0; }
  .hero p:not(.eyebrow) { font-size: 17px; line-height: 1.5; }
  h1 { font-size: clamp(34px, 10vw, 42px); line-height: 1.14; }
  h2 { font-size: clamp(28px, 9vw, 32px); line-height: 1.2; }
  h3 { font-size: 21px; }
  .actions { display: grid; grid-template-columns: 1fr; gap: var(--space-sm); }
  .button,
  .nav-cta { width: 100%; }
  .content,
  .grid > div,
  .panel,
  .card,
  .auth-panel { padding: var(--space-lg); }
  .two,
  .three,
  .cards,
  .stats,
  .track-grid,
  .roadmap-grid,
  .output-grid,
  .evidence-grid,
  .reading-detail-grid,
  .footer-inner { grid-template-columns: 1fr; }
  .reading-controls { grid-template-columns: 1fr; }
  .reading-card { padding: var(--space-md); }
  .progress-item { grid-template-columns: 1fr; }
  .identity-list div { grid-template-columns: 1fr; }
  .footer-inner > div { border-left: 0; border-top: 1px solid var(--inverse-surface-1); padding-top: var(--space-lg); }
}