/* ==========================================================================
   Leo landing page.

   Page composition only. The shell width, navbar, buttons, eyebrow, pulse dot,
   arrow, card, and every colour / type / radius / shadow token belong to
   tokens.css and are never redefined here.

   Breakpoints, written literally, and nothing else:
     1200px  laptop -> wide
      900px  tablet -> laptop
      640px  phone  -> small tablet
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-size: 16px;
}

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

/* One spacing rhythm for the whole page. Restated at the two lower
   breakpoints so every band tightens together instead of drifting apart. */
.landing {
  --section-y: 96px;
  --band-gap: 44px;
}

/* --- Hero ---------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
  padding: 60px 0 84px;
}

.hero-copy,
.hero-composition {
  min-width: 0;
}

.hero-eyebrow {
  margin-bottom: 20px;
}

.hero-copy h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.375rem, 4.4vw, 4rem);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
  margin-bottom: 18px;
}

.hero-copy h1 em {
  font-style: italic;
  color: var(--brand-primary);
}

.hero-body {
  max-width: 52ch;
  margin-bottom: 26px;
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--ink-secondary);
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: var(--band-gap);
}

.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--line-subtle);
}

.hero-proof > div {
  min-width: 0;
}

.hero-proof dt {
  margin-bottom: 5px;
  font-family: var(--font-serif);
  font-size: clamp(1.625rem, 2.4vw, 2.125rem);
  font-weight: 600;
  line-height: 1;
  color: var(--brand-primary);
}

.hero-proof dd {
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink-muted);
}

/* --- Simulated interview panel ------------------------------------------- */

.hero-composition {
  display: flex;
  flex-direction: column;
}

.case-window {
  position: relative;
  width: 100%;
  max-width: 480px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xl);
  background: var(--surface-raised);
  box-shadow: var(--shadow-xl);
}

.case-window::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-primary), var(--gold-primary));
}

.window-top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.live-status-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--brand-primary);
  box-shadow: 0 0 0 2px var(--brand-glow);
}

.window-clock {
  margin-left: auto;
}

.window-title {
  margin-bottom: 14px;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink-primary);
}

/* Both turns share the bubble geometry; only the fill differs. */
.window-message,
.window-candidate {
  padding: 13px 15px;
  margin-bottom: 12px;
  border-radius: var(--r-md);
  font-size: 0.875rem;
  line-height: 1.55;
}

.window-message {
  background: var(--bg-subtle);
  color: var(--ink-primary);
}

.window-candidate {
  width: 92%;
  margin-left: auto;
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.sender-tag {
  display: block;
  margin-bottom: 5px;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  opacity: 0.75;
}

.window-evidence {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-dashed);
  color: var(--brand-primary);
  font-size: 0.75rem;
  font-weight: 600;
}

.evidence-pill {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  flex: none;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand-primary);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
}

.composition-note {
  margin-top: 14px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.composition-note span {
  color: var(--brand-primary);
}

/* --- Section headings ---------------------------------------------------- */

.section-intro {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
  margin-bottom: 40px;
}

.section-intro h2 {
  max-width: 22ch;
  font-family: var(--font-serif);
  font-size: clamp(1.875rem, 3.2vw, 2.75rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
}

.section-intro h2 em {
  font-style: italic;
  color: var(--brand-primary);
}

.section-lead {
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink-secondary);
}

/* --- How it works -------------------------------------------------------- */

.principles {
  padding: var(--section-y) 0;
  border-top: 1px solid var(--line-subtle);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.principle-card {
  padding: 28px 26px;
  border: 1px solid var(--line-base);
  border-radius: var(--r-lg);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.principle-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-card);
}

.step-number {
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
}

.principle-card h3 {
  margin-bottom: 9px;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
}

.principle-card p:last-child {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ink-secondary);
}

/* --- Interview architecture (dark band) ---------------------------------- */

.difference {
  padding: var(--section-y) 0;
  background-color: var(--brand-deep);
}

.difference-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 56px;
}

.difference-grid > * {
  min-width: 0;
}

.difference h2 {
  max-width: 20ch;
  font-family: var(--font-serif);
  font-size: clamp(1.875rem, 3.2vw, 2.75rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.difference h2 em {
  font-style: italic;
  color: var(--gold-primary);
}

.difference-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.diff-item {
  display: grid;
  grid-template-columns: minmax(0, 170px) minmax(0, 1fr);
  gap: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.diff-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.diff-item b {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #ffffff;
}

.diff-item span {
  font-size: 0.875rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.74);
}

/* --- Starting path ------------------------------------------------------- */
/* A curated preview, deliberately not the catalogue: the full library and its
   filters live on /cases. Rows, not cards, so this reads as a sequence. */

.path {
  padding: var(--section-y) 0;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  list-style: none;
}

/* The row stretches to its neighbour so a case whose type wraps to two lines
   does not leave a ragged edge beside a shorter one. */
.case-grid > li {
  display: grid;
}

.path-case {
  display: grid;
  /* The level column is fixed so the arrows line up down the grid. */
  grid-template-columns: auto minmax(0, 1fr) 96px auto;
  align-items: center;
  gap: 16px;
  min-height: 76px;
  padding: 16px 20px;
  border: 1px solid var(--line-base);
  border-radius: var(--r-lg);
  background: var(--surface-raised);
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.path-case:hover {
  transform: translateY(-2px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-card);
}

.path-case:hover .arrow {
  transform: translateX(3px);
}

.path-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink-faint);
}

.path-main {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.path-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
}

.path-meta {
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink-muted);
}

.path-level {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: right;
  color: var(--ink-muted);
}

.path-level[data-level="foundation"] {
  color: var(--brand-primary);
}

.path-level[data-level="advanced"] {
  color: var(--gold-deep);
}

.path-case .arrow {
  color: var(--brand-primary);
  font-size: 1rem;
}

.path-placeholder {
  grid-column: 1 / -1;
  padding: 34px 0;
  font-size: 0.9375rem;
  color: var(--ink-muted);
}

.path-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-subtle);
}

.path-count {
  max-width: 62ch;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--ink-secondary);
}

/* tokens.css grows .btn-sm to a 44px target but leaves the base .btn at 40px,
   so the one full-size button on this page asks for the extra 4px. */
.path-footer .btn {
  min-height: 44px;
}

/* --- Closing ------------------------------------------------------------- */

.closing {
  margin-bottom: 72px;
  padding: 68px clamp(24px, 5vw, 60px);
  border-radius: var(--r-2xl);
  background-color: var(--brand-deep);
  background-image: radial-gradient(circle at 85% 20%, var(--gold-glow), transparent 38%);
  color: #ffffff;
}

.closing-content {
  max-width: 34ch;
}

.closing h2 {
  margin-bottom: 14px;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.closing h2 em {
  font-style: italic;
  color: var(--gold-primary);
}

.closing-lead {
  margin-bottom: 26px;
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.78);
}

.closing-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- Footer -------------------------------------------------------------- */

.footer {
  padding: 40px 0 26px;
  border-top: 1px solid var(--line-subtle);
  color: var(--ink-muted);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
  margin-bottom: 24px;
}

.footer-brand .brand {
  min-height: 44px;
  margin-bottom: 4px;
  font-size: 1.125rem;
}

.footer-motto {
  max-width: 34ch;
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
}

/* Compact link, 44px target. */
.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 18px;
  border-top: 1px solid var(--line-subtle);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1200px) {
  .landing {
    --section-y: 84px;
    --band-gap: 38px;
  }

  .hero {
    gap: 40px;
  }

  .difference-grid {
    gap: 40px;
  }

  .diff-item {
    grid-template-columns: minmax(0, 145px) minmax(0, 1fr);
    gap: 16px;
  }
}

@media (max-width: 900px) {
  .landing {
    --section-y: 68px;
    --band-gap: 32px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
    padding: 40px 0 60px;
  }

  .hero-body {
    font-size: 1.0625rem;
  }

  .case-window {
    max-width: none;
  }

  .section-intro {
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 30px;
  }

  .section-intro h2,
  .difference h2 {
    max-width: none;
  }

  .principle-grid,
  .case-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .difference-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .diff-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
  }

  .closing {
    padding: 52px clamp(22px, 5vw, 44px);
    margin-bottom: 56px;
  }

  .closing-content {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .landing {
    --section-y: 54px;
    --band-gap: 26px;
  }

  .hero {
    padding: 28px 0 48px;
  }

  .hero-actions .btn,
  .closing-actions .btn,
  .path-footer .btn {
    width: 100%;
  }

  .hero-proof {
    gap: 12px;
  }

  .case-window {
    padding: 20px 18px;
  }

  .window-candidate {
    width: 100%;
  }

  /* The row becomes two lines so a long case title never has to share its
     line with the difficulty. Every cell is placed explicitly. */
  .path-case {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 8px 12px;
    padding: 15px 16px;
  }

  .path-index {
    grid-area: 1 / 1 / 2 / 2;
  }

  .path-level {
    grid-area: 1 / 2 / 2 / 3;
    text-align: left;
  }

  .path-case .arrow {
    grid-area: 1 / 3 / 2 / 4;
  }

  .path-main {
    grid-area: 2 / 1 / 3 / 4;
  }

  .path-title {
    font-size: 1.125rem;
  }

  .footer-inner {
    gap: 18px;
  }

  .footer-links {
    flex-direction: column;
    gap: 0;
  }
}