/* CREMA 1968 — espresso brown to burgundy velvet stage, cream editorial UI. */

:root {
  --espresso-0: #120a06;
  --espresso-1: #2a1308;
  --espresso-2: #4a1d0c;
  --espresso-3: #7a2f17;
  --burgundy: #4a1620;
  --burgundy-2: #6c2230;
  --cream: #f3e8d2;
  --cream-dim: #d6c6a7;
  --cream-faint: rgba(243, 232, 210, 0.45);
  --brass: #d9a64a;
  --rule: rgba(243, 232, 210, 0.18);
  --ink-shadow: 0 1px 10px rgba(10, 5, 2, 0.55);
  --font-sans: Manrope, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--espresso-0);
  color: var(--cream);
  font-family: var(--font-sans);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

/* ------------------------------------------------------------- backdrop */

.backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background:
    radial-gradient(120% 78% at 72% 18%, rgba(122, 47, 23, 0.55) 0%, rgba(42, 19, 8, 0) 62%),
    radial-gradient(90% 70% at 18% 92%, rgba(74, 22, 32, 0.62) 0%, rgba(18, 10, 6, 0) 66%),
    linear-gradient(178deg, #2a1308 0%, #3a1609 34%, #4a1620 72%, #22100a 100%);
}
.backdrop::before {
  content: "";
  position: absolute;
  inset: -10%;
  background-image: radial-gradient(
    rgba(243, 232, 210, 0.05) 0.6px,
    transparent 0.6px
  );
  background-size: 7px 7px;
  opacity: 0.5;
}
#stage-fx {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
/* soft warm arc lights sweeping the velvet wall */
.arc {
  position: absolute;
  border-radius: 50%;
  filter: blur(38px);
  opacity: 0.5;
  pointer-events: none;
  will-change: transform, opacity;
}
.arc-a {
  width: 78vmin;
  height: 30vmin;
  left: 12%;
  top: 8%;
  background: radial-gradient(ellipse at center, rgba(226, 159, 74, 0.55), rgba(226, 159, 74, 0) 68%);
  animation: arcDrift 22s ease-in-out infinite alternate;
}
.arc-b {
  width: 64vmin;
  height: 26vmin;
  right: 8%;
  bottom: 22%;
  background: radial-gradient(ellipse at center, rgba(150, 52, 48, 0.6), rgba(150, 52, 48, 0) 70%);
  animation: arcDrift 28s ease-in-out infinite alternate-reverse;
}
@keyframes arcDrift {
  from { transform: translate3d(0, 0, 0) scale(1); opacity: 0.38; }
  60%  { transform: translate3d(3vmin, -2vmin, 0) scale(1.06); opacity: 0.58; }
  to   { transform: translate3d(-2vmin, 2vmin, 0) scale(0.96); opacity: 0.3; }
}
@keyframes ripple {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(0, -4vmin, 0); }
}
.vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(125% 100% at 50% 42%, rgba(0, 0, 0, 0) 46%, rgba(8, 4, 2, 0.72) 100%);
  pointer-events: none;
}
@media (prefers-reduced-motion: reduce) {
  .arc { animation-duration: 46s; opacity: 0.32; }
}

/* -------------------------------------------------------------- layout */

.layout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(230px, 22vw) minmax(0, 1fr) minmax(225px, 21vw);
  grid-template-rows: 100vh;
  gap: clamp(14px, 2.2vw, 34px);
  align-items: stretch;
  padding: clamp(16px, 2.6vh, 34px) clamp(16px, 2.4vw, 34px);
}

.rail {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.rail-left { justify-content: flex-start; padding-top: clamp(6px, 2vh, 22px); }
.rail-right { justify-content: flex-start; align-items: stretch; padding-top: clamp(6px, 2vh, 22px); }

/* brand block -------------------------------------------------------- */

.brand {
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 2px 8px;
  margin-bottom: clamp(20px, 4vh, 42px);
}
.brand-mark {
  font-size: clamp(22px, 2vw, 30px);
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--cream);
  text-shadow: var(--ink-shadow);
}
.brand-year {
  font-size: clamp(12px, 1vw, 15px);
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--brass);
}
.brand-line {
  grid-column: 1 / -1;
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--cream-faint);
  text-transform: uppercase;
}

.headline {
  margin: 0 0 clamp(14px, 2.4vh, 24px);
  font-size: clamp(28px, 3.1vw, 46px);
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--cream);
  text-shadow: var(--ink-shadow);
}
.lede {
  margin: 0;
  max-width: 38ch;
  font-size: clamp(12.5px, 0.95vw, 14.5px);
  line-height: 1.66;
  color: var(--cream-dim);
}
.rule {
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, var(--rule), rgba(243, 232, 210, 0));
  margin: clamp(18px, 3vh, 30px) 0;
  border: 0;
}

.specs {
  margin: clamp(20px, 3.4vh, 34px) 0 0;
  padding: 0;
  width: 100%;
  max-width: 30ch;
  display: grid;
  gap: 0;
}
.specs div {
  display: grid;
  grid-template-columns: 5.2em 1fr;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
}
.specs div:last-child { border-bottom: 0; }
.specs dt {
  font-size: 10.5px;
  letter-spacing: 0.24em;
  color: var(--cream-faint);
  padding-top: 2px;
}
.specs dd {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--cream);
}

.serial {
  margin-top: auto;
  padding-top: clamp(18px, 3vh, 30px);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--cream-faint);
  display: grid;
  gap: 4px;
}
.serial b { color: var(--cream-dim); font-weight: 600; }

/* stage --------------------------------------------------------------- */

.stage {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.stage-frame {
  position: relative;
  flex: 1;
  min-height: 0;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background:
    radial-gradient(90% 70% at 50% 30%, rgba(255, 214, 160, 0.08), rgba(255, 214, 160, 0) 70%),
    linear-gradient(180deg, rgba(243, 232, 210, 0.03), rgba(20, 12, 8, 0.28));
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.35), 0 24px 60px rgba(0, 0, 0, 0.4);
}
#stage-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  touch-action: none;
}
#stage-canvas:active { cursor: grabbing; }
.stage-corner {
  position: absolute;
  width: 22px;
  height: 22px;
  pointer-events: none;
}
.stage-corner.top-left {
  top: -1px; left: -1px;
  border-top: 1px solid var(--brass);
  border-left: 1px solid var(--brass);
}
.stage-corner.bottom-right {
  bottom: -1px; right: -1px;
  border-bottom: 1px solid var(--brass);
  border-right: 1px solid var(--brass);
}
.stage-hint {
  margin: 10px 2px 0;
  font-size: 10.5px;
  letter-spacing: 0.26em;
  color: var(--cream-faint);
}
.status {
  margin: 6px 2px 0;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--brass);
  letter-spacing: 0.04em;
  transition: color 0.5s ease;
}

/* controls ------------------------------------------------------------ */

.panel {
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 16px 14px 18px;
  background: linear-gradient(180deg, rgba(243, 232, 210, 0.055), rgba(243, 232, 210, 0.015));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.panel-label {
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--cream-faint);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.btn {
  width: 100%;
  display: block;
  padding: 12px 14px;
  margin-bottom: 9px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cream);
  background: rgba(243, 232, 210, 0.08);
  border: 1px solid var(--rule);
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.btn:hover {
  background: rgba(243, 232, 210, 0.14);
  border-color: rgba(217, 166, 74, 0.6);
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}
.btn.primary {
  background: linear-gradient(180deg, rgba(217, 166, 74, 0.85), rgba(176, 122, 46, 0.85));
  border-color: rgba(243, 232, 210, 0.36);
  color: #22100a;
}
.btn.primary:hover {
  background: linear-gradient(180deg, rgba(231, 187, 110, 0.95), rgba(190, 134, 52, 0.95));
}
.btn[aria-pressed="true"] {
  background: rgba(217, 166, 74, 0.18);
  border-color: var(--brass);
  color: var(--brass);
}
.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
}
.btn-row .btn { margin-bottom: 9px; }
.btn.chip { padding: 9px 8px; font-size: 12px; }
.lang-row { margin-top: 2px; }

.legend {
  margin-top: clamp(16px, 2.4vh, 24px);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 14px 14px 6px;
  background: linear-gradient(180deg, rgba(74, 22, 32, 0.34), rgba(20, 12, 8, 0.3));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: legendIn 0.5s ease both;
}
@keyframes legendIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.legend-label {
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--cream-faint);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.legend-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}
.legend-list li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 8px;
  padding: 7px 0;
  border-bottom: 1px solid var(--rule);
}
.legend-list li:last-child { border-bottom: 0; }
.legend-list .idx {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--brass);
  padding-top: 3px;
  font-weight: 600;
}
.legend-list .name {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cream);
  display: block;
}
.legend-list .note {
  font-size: 10.5px;
  line-height: 1.5;
  color: var(--cream-faint);
  display: block;
  margin-top: 2px;
}
.legend.empty { display: none; }

.footnote {
  margin: auto 0 0;
  padding-top: 14px;
  font-size: 10px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--cream-faint);
}

/* toast --------------------------------------------------------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  z-index: 5;
  padding: 9px 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cream);
  background: rgba(34, 16, 10, 0.88);
  border: 1px solid rgba(217, 166, 74, 0.55);
  border-radius: 2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s ease;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(-4px);
}

/* ----------------------------------------------------------- mobile */

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr) auto;
    gap: 10px;
    padding: 12px 12px 14px;
    height: 100vh;
    overflow-y: auto;
  }
  .rail-left { padding-top: 0; order: 1; }
  .stage { order: 2; min-height: 46vh; }
  .rail-right { order: 3; padding-top: 0; }
  .brand { margin-bottom: 10px; }
  .headline { font-size: clamp(22px, 6.4vw, 30px); margin-bottom: 8px; }
  .lede { font-size: 12px; line-height: 1.55; }
  .specs { display: none; }
  .serial { display: none; }
  .rule { display: none; }
  .panel { padding: 12px; }
  .btn { padding: 11px 10px; margin-bottom: 8px; }
  .legend { max-height: 190px; overflow-y: auto; }
  .footnote { display: none; }
  .stage-hint { display: none; }
}