/* RYBitten-adjacent playground + Japanese textbook palette */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg-deep);
}

/* Atmospheric layers (color cube / lab feeling) */
.bg-layers {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-grid {
  position: absolute;
  inset: -20%;
  background:
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(0deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  transform: perspective(900px) rotateX(58deg) translateY(-12%);
  opacity: 0.35;
}

.bg-glow {
  position: absolute;
  width: 120vmin;
  height: 120vmin;
  left: 50%;
  top: -40vmin;
  transform: translateX(-50%);
  background: radial-gradient(
    circle at 50% 40%,
    color-mix(in srgb, var(--accent) 22%, transparent) 0%,
    transparent 55%
  );
  opacity: 0.55;
}

.bg-cubes {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 78%, color-mix(in srgb, var(--leaf) 18%, transparent) 0, transparent 32%),
    radial-gradient(circle at 88% 22%, color-mix(in srgb, var(--gold) 16%, transparent) 0, transparent 28%),
    radial-gradient(circle at 70% 88%, color-mix(in srgb, var(--rum-600) 20%, transparent) 0, transparent 30%);
}

.grain {
  position: absolute;
  inset: 0;
  opacity: 0.07;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.site-header,
.page,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.25rem clamp(1rem, 3vw, 1.5rem);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
}

.brand-mark {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  box-shadow: 0 0 0 1px var(--line-strong);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.25rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 75%, transparent);
  backdrop-filter: blur(10px);
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-muted);
  padding: 0.45rem 0.65rem;
  border-radius: 999px;
  transition: color var(--motion-duration) var(--motion-easing),
    background var(--motion-duration) var(--motion-easing);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--paper);
  background: color-mix(in srgb, var(--accent) 22%, transparent);
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 1.5rem) 3.5rem;
  display: grid;
  gap: clamp(1rem, 2vw, 1.35rem);
}

.panel {
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1rem, 2.5vw, 1.35rem);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(12px);
}

.hero.panel {
  position: relative;
  overflow: hidden;
}

.hero.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    color-mix(in srgb, var(--accent) 12%, transparent),
    transparent 40%,
    color-mix(in srgb, var(--leaf) 10%, transparent)
  );
  pointer-events: none;
}

.hero.panel > * {
  position: relative;
  z-index: 1;
}

h1,
h2,
h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--paper);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.65rem);
  line-height: 1.15;
}

h2 {
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
}

h3 {
  font-size: 1.05rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
}

.lead {
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 62ch;
  margin: 0;
}

.small {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.swatch-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 1rem;
}

.swatch-strip span {
  width: 2.25rem;
  height: 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.button-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--paper);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  cursor: pointer;
  transition: transform 180ms var(--motion-easing), border-color 180ms ease,
    background 180ms ease;
}

.button-link:hover {
  border-color: color-mix(in srgb, var(--gold) 55%, var(--line-strong));
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  transform: translateY(-1px);
}

.tag-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-muted);
  background: color-mix(in srgb, var(--leaf) 8%, transparent);
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 1rem;
  background: color-mix(in srgb, var(--panel-elevated) 88%, transparent);
  transition: transform 220ms var(--motion-easing), border-color 220ms ease;
}

.card:hover {
  transform: translateY(-3px) rotate(-0.25deg);
  border-color: color-mix(in srgb, var(--gold) 35%, var(--border));
}

.card h3 {
  margin-bottom: 0.45rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.card button {
  margin-top: 0.65rem;
}

.meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin: 0.35rem 0 0;
}

.stack {
  display: grid;
  gap: 0.75rem;
}

.details-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: color-mix(in srgb, var(--panel-elevated) 90%, transparent);
}

.details-card summary {
  cursor: pointer;
  padding: 0.95rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--paper);
  background: color-mix(in srgb, var(--rum-800) 35%, transparent);
  list-style: none;
}

.details-card summary::-webkit-details-marker {
  display: none;
}

.details-card .details-body {
  padding: 1rem;
}

.details-body ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
}

.controls label {
  display: block;
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-top: 0.65rem;
}

.controls input,
.controls select {
  width: 100%;
  margin-top: 0.35rem;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-deep) 85%, var(--panel));
  color: var(--paper);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.preview-shell {
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  min-height: 200px;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: color-mix(in srgb, var(--bg-deep) 40%, transparent);
}

.preview-button {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--leaf) 18%, transparent);
  color: var(--paper);
  padding: 0.65rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  cursor: pointer;
  transition: transform 180ms var(--motion-easing);
}

.preview-button:hover {
  transform: scale(1.02);
}

.preview-modal {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--bg-deep) 70%, black);
  display: none;
  place-items: center;
  z-index: 50;
}

.preview-modal[data-open="true"] {
  display: grid;
}

.preview-modal-inner {
  background: var(--panel-elevated);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  width: min(90vw, 420px);
  padding: 1.15rem;
  box-shadow: var(--shadow-soft);
}

.toggle-row {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.78rem;
}

.ascii-demo {
  display: grid;
  gap: 0.85rem;
}

.ascii-demo video {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.ascii-output {
  margin: 0;
  height: 240px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  color: var(--gold);
  font-size: 0.42rem;
  line-height: 0.42rem;
  font-family: var(--font-mono);
  background: var(--bg-deep);
}

.stage-meta {
  margin-bottom: 0.75rem;
}

.chapter-canvas {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-deep) 80%, var(--rum-900));
  display: block;
}

.site-footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.5rem clamp(1rem, 3vw, 1.5rem) 2.5rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.site-footer a {
  color: var(--gold);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--paper);
}

/* —— Framer-style shell: sticky rail + main column —— */
.app-shell {
  display: flex;
  max-width: 1180px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 0 clamp(0.75rem, 2vw, 1.25rem);
  gap: clamp(1rem, 3vw, 2.5rem);
  position: relative;
  z-index: 1;
}

.rail {
  width: 11.5rem;
  flex-shrink: 0;
  padding: 1.35rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: 0;
  align-self: flex-start;
  max-height: 100vh;
  overflow: auto;
}

.rail-brand {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.theme-toggle {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.45rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
  color: var(--text-muted);
  cursor: pointer;
  width: fit-content;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.theme-toggle:hover {
  color: var(--paper);
  border-color: var(--line-strong);
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding-top: 0.25rem;
}

.rail-nav a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--text-muted);
  padding: 0.28rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.rail-nav a:hover,
.rail-nav a[aria-current="page"] {
  color: var(--paper);
  border-color: var(--line);
}

.rail-secondary {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.rail-secondary-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold);
  text-decoration: none;
}

.rail-secondary-link:hover {
  color: var(--paper);
}

.rail-meta {
  margin-top: auto;
  padding-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.rail-meta a {
  color: var(--text-muted);
  text-decoration: none;
}

.rail-meta a:hover {
  color: var(--paper);
}

.app-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.app-main .page {
  max-width: none;
  margin: 0;
  padding: 0 0 3rem;
  flex: 1;
}

.app-main .site-footer {
  max-width: none;
  margin: 0;
  padding: 1rem 0 2.5rem;
}

/* Home hero split + color cube */
.hero-split {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 320px);
  gap: clamp(1rem, 3vw, 2rem);
  align-items: stretch;
}

.hero-copy h1 {
  margin-bottom: 0.35rem;
}

.meet-title {
  font-size: clamp(2rem, 5vw, 3.1rem);
  letter-spacing: -0.03em;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.cube-wrap {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-deep) 55%, transparent);
  overflow: hidden;
  min-height: 260px;
  box-shadow: var(--shadow-soft);
}

#color-cube {
  display: block;
  width: 100%;
  height: min(42vw, 320px);
  cursor: grab;
}

#color-cube:active {
  cursor: grabbing;
}

.cube-hint {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  border-top: 1px solid var(--line);
}

.portfolio-card .meta {
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

@media (max-width: 900px) {
  .app-shell {
    flex-direction: column;
    gap: 0.5rem;
  }

  .rail {
    position: relative;
    width: 100%;
    max-height: none;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    padding: 0.75rem 0;
    gap: 0.65rem 1rem;
  }

  .rail-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.35rem 0.75rem;
    padding-top: 0;
    border-left: 1px solid var(--line);
    padding-left: 0.75rem;
    flex: 1;
  }

  .rail-nav a {
    border-bottom: none;
    padding: 0.2rem 0;
  }

  .rail-secondary {
    flex-direction: row;
    border-top: none;
    padding-top: 0;
    gap: 0.75rem;
  }

  .rail-meta {
    flex-direction: row;
    margin-top: 0;
    padding-top: 0;
    width: 100%;
    justify-content: flex-end;
    border-top: 1px solid var(--line);
    padding-top: 0.5rem;
  }

  .hero-split {
    grid-template-columns: 1fr;
  }

  #color-cube {
    height: 240px;
  }
}

@media (max-width: 640px) {
  .site-nav {
    width: 100%;
    justify-content: center;
  }
}