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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  background:
    radial-gradient(900px 520px at 18% -8%, rgba(226, 74, 50, 0.16), transparent 55%),
    radial-gradient(700px 480px at 88% 8%, rgba(244, 239, 230, 0.05), transparent 50%),
    linear-gradient(180deg, #050608 0%, var(--color-paper) 42%, #0a0b10 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* ── Layout ── */

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: rgba(18, 21, 28, 0.82);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header__tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3) var(--space-5);
}

.locale-switch {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-paper-raised);
}

.locale-switch__btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--color-ink-muted);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.locale-switch__btn:hover {
  color: var(--color-ink);
}

.locale-switch__btn[aria-pressed="true"] {
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

[data-visible-lang][hidden] {
  display: none !important;
}

.site-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.site-title__sub {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-ink-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: var(--space-1);
}

.site-nav {
  display: flex;
  gap: var(--space-1);
}

.site-nav__btn {
  appearance: none;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.site-nav__btn:hover {
  color: var(--color-ink);
  background: var(--color-paper);
}

.site-nav__btn[aria-current="page"] {
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
  width: 100%;
}

.panel {
  display: none;
}

.panel[aria-hidden="false"] {
  display: block;
}

/* ── Section headers ── */

.section-header {
  margin-bottom: var(--space-8);
}

.section-header h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
}

.section-header p {
  margin: 0;
  color: var(--color-ink-muted);
  max-width: 42rem;
  line-height: var(--leading-relaxed);
}

/* ── Status badge ── */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
}

.badge--planned {
  color: var(--color-status-planned);
  background: var(--color-paper);
  border: 1px solid var(--color-border);
}

.badge--progress {
  color: var(--color-status-progress);
  background: var(--color-status-progress-bg);
}

.badge--ready {
  color: var(--color-status-ready);
  background: var(--color-status-ready-bg);
}

/* ── Archive grid ── */

.archive-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.archive-filter {
  appearance: none;
  border: 1px solid var(--color-border);
  background: var(--color-paper-raised);
  color: var(--color-ink-muted);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.archive-filter:hover {
  border-color: var(--color-border-strong);
  color: var(--color-ink);
}

.archive-filter[aria-pressed="true"] {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.archive-filter-note {
  margin: 0 0 var(--space-6);
  max-width: 48rem;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-relaxed);
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: var(--space-6);
}

.piece-card--placeholder {
  opacity: 0.92;
  border-style: dashed;
}

.piece-card--external .piece-card__title::after {
  content: " ↗";
  font-size: 0.85em;
  color: var(--color-ink-faint);
  font-family: var(--font-sans);
  font-weight: 500;
}

.piece-card {
  background: var(--color-paper-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.piece-card--link {
  color: inherit;
  text-decoration: none;
}

.piece-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.piece-card--link:hover .piece-card__title {
  color: var(--color-accent);
}

.piece-card__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
}

.piece-card__meta {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.piece-card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat__label {
  font-size: var(--text-xs);
  color: var(--color-ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat__value {
  font-size: var(--text-sm);
  font-weight: 500;
  font-family: var(--font-mono);
}

.piece-card__note {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-relaxed);
  padding: var(--space-3) var(--space-4);
  background: var(--color-paper);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-accent);
}

.add-piece-card {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  text-align: center;
  color: var(--color-ink-faint);
  min-height: 14rem;
}

.add-piece-card__icon {
  font-size: var(--text-2xl);
  line-height: 1;
}

.add-piece-card__label {
  font-size: var(--text-sm);
  font-weight: 500;
}

/* ── Plan sections ── */

.plan-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: var(--space-10);
  align-items: start;
}

.plan-nav {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.plan-nav__link {
  appearance: none;
  border: none;
  background: transparent;
  text-align: left;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.plan-nav__link:hover {
  color: var(--color-ink);
  background: var(--color-paper-raised);
}

.plan-nav__link[aria-current="true"] {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background: var(--color-accent-soft);
  font-weight: 500;
}

.plan-section {
  display: none;
}

.plan-section[aria-hidden="false"] {
  display: block;
}

.plan-section h3 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
}

.plan-section p,
.plan-section li {
  color: var(--color-ink-muted);
  line-height: var(--leading-relaxed);
}

.plan-section p {
  margin: 0 0 var(--space-4);
}

.plan-section ul,
.plan-section ol {
  margin: 0 0 var(--space-6);
  padding-left: var(--space-6);
}

.plan-section li {
  margin-bottom: var(--space-2);
}

.callout {
  padding: var(--space-4) var(--space-5);
  background: var(--color-accent-soft);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-accent);
  margin-bottom: var(--space-6);
}

.callout p {
  margin: 0;
  color: var(--color-ink);
  font-size: var(--text-sm);
}

/* ── Dataset tree ── */

.dataset-tree {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--color-paper-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  line-height: var(--leading-relaxed);
  overflow-x: auto;
}

.dataset-tree .dir {
  color: var(--color-accent);
  font-weight: 500;
}

.dataset-tree .comment {
  color: var(--color-ink-faint);
}

.dataset-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
}

.dataset-table th,
.dataset-table td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.dataset-table th {
  font-weight: 600;
  color: var(--color-ink);
  background: var(--color-paper-raised);
}

.dataset-table td {
  color: var(--color-ink-muted);
}

.dataset-table tr:last-child td {
  border-bottom: none;
}

/* ── Roadmap ── */

.roadmap {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.roadmap-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-paper-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.roadmap-item__phase {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-top: var(--space-1);
}

.roadmap-item__content h4 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  font-weight: 600;
}

.roadmap-item__content p {
  margin: 0;
  font-size: var(--text-sm);
}

/* ── Home landing (sparse + clear) ── */

.panel[data-panel="home"] {
  padding: 0;
}

.home-stage {
  position: relative;
  min-height: calc(100vh - 5.25rem);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.home-stage::before {
  content: "";
  position: absolute;
  inset: -10% -5% auto;
  height: 70%;
  background:
    linear-gradient(105deg, transparent 20%, rgba(226, 74, 50, 0.08) 48%, transparent 72%),
    radial-gradient(ellipse at 70% 30%, rgba(244, 239, 230, 0.07), transparent 55%);
  pointer-events: none;
  animation: home-glow 10s ease-in-out infinite alternate;
}

.home-hero {
  position: relative;
  z-index: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-7, 1.75rem);
  padding: var(--space-10) 0 var(--space-16);
  animation: home-rise 0.85s ease both;
}

.home-hero__brand {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 5.25rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.02;
}

.home-hero__brand span:last-child {
  display: block;
  margin-top: var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}

.home-hero__headline {
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 600;
  line-height: var(--leading-tight);
  color: var(--color-ink);
  animation: home-rise 0.9s ease 0.06s both;
}

.home-hero__support {
  margin: 0;
  max-width: 34rem;
  color: var(--color-ink-muted);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  animation: home-rise 0.9s ease 0.12s both;
}

.home-howto {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  max-width: 40rem;
  border-top: 1px solid var(--color-border);
  animation: home-rise 0.9s ease 0.18s both;
}

.home-howto__item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.home-howto__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
  padding-top: 0.35rem;
}

.home-howto__item h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.home-howto__item p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-relaxed);
}

.home-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
  animation: home-rise 0.9s ease 0.24s both;
}

.home-cta__btn {
  appearance: none;
  border: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.95rem 1.35rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.home-cta__btn:hover {
  transform: translateY(-2px);
  border-color: var(--color-ink);
}

.home-cta__btn--primary {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: #0a0b10;
}

.home-cta__btn--primary:hover {
  background: #fff;
  border-color: #fff;
  color: #0a0b10;
}

.home-cta__btn--ghost {
  border-color: transparent;
  color: var(--color-ink-muted);
  text-decoration: underline;
  text-underline-offset: 0.35em;
  padding-left: var(--space-2);
  padding-right: var(--space-2);
}

.home-cta__btn--ghost:hover {
  color: var(--color-accent);
  border-color: transparent;
  transform: none;
}

/* Story: motive blocks + process rail */
.story-blocks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.story-block h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
}

.story-block p {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 46ch;
}

.story-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--color-border);
  margin-bottom: var(--space-10);
}

.story-step {
  padding: var(--space-6) var(--space-5) var(--space-6) 0;
  border-right: 1px solid var(--color-border);
  animation: home-rise 0.7s ease both;
}

.story-step:nth-child(2) { animation-delay: 0.06s; }
.story-step:nth-child(3) { animation-delay: 0.12s; }
.story-step:nth-child(4) { animation-delay: 0.18s; }

.story-step:last-child {
  border-right: none;
  padding-right: 0;
}

.story-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.story-step h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
}

.story-step p {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 28ch;
}

.story-note {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 40rem;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.story-note p {
  margin: 0;
  color: var(--color-ink-muted);
  line-height: var(--leading-relaxed);
}

@keyframes home-rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes home-glow {
  from { opacity: 0.55; transform: translate3d(0, 0, 0); }
  to { opacity: 1; transform: translate3d(-2%, 2%, 0); }
}

@media (max-width: 900px) {
  .story-blocks {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .story-rail {
    grid-template-columns: 1fr 1fr;
  }

  .story-step:nth-child(2) {
    border-right: none;
  }

  .story-step:nth-child(1),
  .story-step:nth-child(2) {
    border-bottom: 1px solid var(--color-border);
  }
}

/* ── Responsive ── */

@media (max-width: 768px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .plan-layout {
    grid-template-columns: 1fr;
  }

  .plan-nav {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .roadmap-item {
    grid-template-columns: 1fr;
  }

  .home-stage {
    min-height: calc(100vh - 8rem);
  }

  .story-rail {
    grid-template-columns: 1fr;
  }

  .story-step {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding-right: 0;
  }
}