/* ==========================================================================
   opensource.bid -- v2
   Surreal auction hall : duotone : layered-depth : line illustrations
   Palette tokens locked to DESIGN.md hexes
   ========================================================================== */

:root {
  --indigo: #1A1840;
  --amber: #D0A040;
  --phantom: #F0ECE8;
  --coral: #E06858;
  --grid: #808890;
  --violet: #7850A0;
  --parchment: #E8E0D0;

  /* Fonts: Caveat (Google Fonts), Source Serif 4 (Google Fonts) */
  --font-hand: "Caveat", "Brush Script MT", cursive;
  --font-serif: "Source Serif 4", "Source Serif Pro", "Georgia", serif;

  --content-max: 680px;
  --gallery-gap: 80px;
  --grid-spacing: 80px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(15px, 1vw, 17px);
  line-height: 1.8;
  color: var(--phantom);
  background-color: var(--indigo);
  background-image:
    radial-gradient(ellipse at 20% 15%, rgba(208, 160, 64, 0.08), transparent 45%),
    radial-gradient(ellipse at 80% 75%, rgba(120, 80, 160, 0.10), transparent 50%),
    linear-gradient(180deg, var(--indigo) 0%, #221E48 50%, var(--indigo) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
  perspective: 1200px;
}

/* ==========================================================================
   Grid-lines measurement framework
   ========================================================================== */

.grid-frame {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 1500ms ease-out;
}

.grid-frame.is-drawn {
  opacity: 1;
}

.grid-frame .grid-lines line {
  stroke: var(--grid);
  stroke-width: 0.5;
  opacity: 0.05;
  transition: opacity 600ms ease;
}

.grid-frame.is-active .grid-lines line {
  opacity: 0.05;
}

.grid-frame.is-active .grid-lines line.is-near {
  opacity: 0.12;
}

.grid-frame .grid-labels text {
  fill: var(--grid);
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.35;
}

/* ==========================================================================
   Duotone atmospheric washes
   ========================================================================== */

.duotone-wash {
  position: fixed;
  width: 70vw;
  height: 70vw;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 2200ms ease-out;
}

#washA {
  top: -20vw;
  left: -15vw;
  background: radial-gradient(circle, rgba(208, 160, 64, 0.40), transparent 70%);
}

#washB {
  bottom: -25vw;
  right: -20vw;
  background: radial-gradient(circle, rgba(120, 80, 160, 0.45), transparent 70%);
}

#washC {
  top: 35vh;
  left: 30vw;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(224, 104, 88, 0.18), transparent 70%);
}

.duotone-wash.is-bloom {
  opacity: 1;
}

/* ==========================================================================
   Auction hall entrance (Section 01)
   ========================================================================== */

.hall-entrance {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  z-index: 2;
  transform-style: preserve-3d;
  overflow: hidden;
}

.hall-stack {
  position: relative;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  transform-style: preserve-3d;
}

/* Depth layers */
.depth-layer {
  position: relative;
  transition: transform 600ms ease-out;
  will-change: transform;
}

.depth-back {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  transform: translateZ(-200px) scale(1.2);
  opacity: 0.55;
  z-index: 1;
}

.depth-mid {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  transform: translateZ(-80px) scale(1.05);
  opacity: 0.75;
  z-index: 2;
}

.depth-front {
  position: relative;
  transform: translateZ(0);
  z-index: 3;
  padding: 80px 0;
  text-align: left;
}

/* Floating illustrations */
.floating-illus {
  width: 320px;
  height: 320px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1200ms ease-out, transform 1200ms ease-out;
}

.illus-large { width: 380px; height: 380px; }
.illus-medium { width: 240px; height: 240px; transform: translate(-10%, -8%) translateY(20px); }

.floating-illus.is-shown {
  opacity: 1;
  transform: translateY(0);
}

.illus-medium.is-shown { transform: translate(-10%, -8%) translateY(0); }

/* Line art (technical drawing style) */
.line-art {
  fill: none;
  stroke: var(--phantom);
  stroke-width: 1;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 400ms ease;
}

.line-art-amber {
  stroke: var(--amber);
  fill: none;
}

.line-art-thin {
  stroke-width: 0.6;
}

.illus-label {
  fill: var(--grid);
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-anchor: middle;
  opacity: 0.6;
}

/* Hall title and text */
.kicker {
  font-family: var(--font-serif);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grid);
  margin: 0 0 24px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 800ms ease-out 200ms, transform 800ms ease-out 200ms;
}

.hall-title {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(54px, 9vw, 132px);
  line-height: 0.95;
  margin: 0 0 28px;
  color: var(--phantom);
  letter-spacing: -0.01em;
  display: inline-block;
  transform-origin: left center;
  transform: scale(0.5);
  opacity: 0;
  transition: transform 800ms cubic-bezier(0.2, 0.7, 0.2, 1) 400ms,
              opacity 800ms ease-out 400ms;
}

.title-pre { color: var(--phantom); }
.title-dot { color: var(--coral); }
.title-tld { color: var(--amber); }

.hall-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.8;
  color: var(--phantom);
  max-width: 520px;
  margin: 0 0 32px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 900ms ease-out 800ms, transform 900ms ease-out 800ms;
}

.hall-bid {
  font-family: var(--font-hand);
  font-weight: 400;
  font-size: clamp(24px, 2.5vw, 40px);
  color: var(--amber);
  margin: 0 0 36px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 900ms ease-out 1000ms, transform 900ms ease-out 1000ms;
}

.bid-number {
  display: inline-block;
  margin-left: 12px;
  color: var(--coral);
}

.bid-decimal {
  font-size: 0.7em;
  letter-spacing: 0.04em;
}

.hall-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grid);
  margin: 0;
  opacity: 0;
  transition: opacity 900ms ease-out 1200ms;
}

.meta-divider {
  color: var(--violet);
}

/* When entrance is in :is-entered state, reveal */
.hall-entrance.is-entered .kicker,
.hall-entrance.is-entered .hall-subtitle,
.hall-entrance.is-entered .hall-bid {
  opacity: 1;
  transform: translateY(0);
}

.hall-entrance.is-entered .hall-title {
  opacity: 1;
  transform: scale(1);
}

.hall-entrance.is-entered .hall-meta {
  opacity: 1;
}

/* Hall corners (catalog markings) */
.hall-corner {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grid);
  opacity: 0.6;
  z-index: 4;
}

.hall-corner-tl {
  top: 32px;
  left: 32px;
}

.hall-corner-br {
  bottom: 32px;
  right: 32px;
  text-align: right;
}

.corner-tag {
  font-feature-settings: "tnum" 1;
}

/* Scroll cue */
.scroll-cue {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--phantom);
  opacity: 0.5;
  z-index: 4;
}

.cue-line {
  display: block;
  width: 1px;
  height: 56px;
  background: linear-gradient(180deg, var(--phantom), transparent);
  animation: cueDrift 2400ms ease-in-out infinite;
}

@keyframes cueDrift {
  0%, 100% { transform: scaleY(1); transform-origin: top; opacity: 0.5; }
  50% { transform: scaleY(0.4); transform-origin: top; opacity: 0.9; }
}

/* ==========================================================================
   Section tag (gallery / catalog markers)
   ========================================================================== */

.section-tag {
  display: inline-flex;
  align-items: baseline;
  gap: 16px;
  margin: 0 auto 48px;
  padding: 0 24px;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grid);
  border-top: 1px solid rgba(128, 136, 144, 0.2);
  padding-top: 18px;
  max-width: var(--content-max);
}

.tag-num {
  color: var(--amber);
  font-weight: 600;
}

/* ==========================================================================
   Bid Gallery (Section 02)
   ========================================================================== */

.bid-gallery {
  position: relative;
  padding: 120px 24px 80px;
  z-index: 2;
}

.gallery-intro {
  max-width: var(--content-max);
  margin: 0 auto var(--gallery-gap);
  padding: 0 24px;
}

.gallery-heading {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(28px, 3.5vw, 56px);
  line-height: 1.05;
  color: var(--phantom);
  margin: 0 0 16px;
}

.gallery-lead {
  font-family: var(--font-serif);
  font-size: clamp(15px, 1vw, 17px);
  color: var(--phantom);
  opacity: 0.85;
  max-width: 540px;
  margin: 0;
}

/* Lot grid -- staggered layered cards */
.lot-grid {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 32px 24px;
  transform-style: preserve-3d;
}

.bid-card {
  --card-rot: 0deg;
  position: relative;
  grid-column: span 6;
  background: var(--parchment);
  color: var(--indigo);
  padding: 28px 28px 32px;
  border: 1px solid rgba(26, 24, 64, 0.10);
  border-radius: 2px;
  cursor: pointer;
  transform: translateY(24px) rotate(var(--card-rot));
  opacity: 0;
  transition: transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1),
              opacity 700ms ease-out,
              box-shadow 400ms ease;
  box-shadow:
    0 1px 0 rgba(26, 24, 64, 0.04),
    0 18px 30px -22px rgba(26, 24, 64, 0.6);
  z-index: 3;
}

.bid-card.is-revealed {
  opacity: 1;
  transform: translateY(0) rotate(var(--card-rot));
}

.bid-card:hover,
.bid-card:focus-visible {
  outline: none;
  transform: translateY(-4px) translateZ(20px) rotate(1deg) scale(1.02);
  box-shadow:
    0 1px 0 rgba(26, 24, 64, 0.04),
    0 28px 50px -22px rgba(26, 24, 64, 0.7),
    0 0 0 1px rgba(208, 160, 64, 0.4);
}

.bid-card:hover .line-art,
.bid-card:focus-visible .line-art {
  stroke: var(--amber);
}

.bid-card:nth-child(odd) { --card-rot: -0.6deg; }
.bid-card:nth-child(even) { --card-rot: 0.4deg; transform-origin: right center; }

.bid-card:nth-child(3n) {
  grid-column: span 4;
}

.bid-card:nth-child(3n+1) {
  grid-column: span 5;
}

.bid-card:nth-child(3n+2) {
  grid-column: span 7;
}

@media (max-width: 900px) {
  .bid-card,
  .bid-card:nth-child(3n),
  .bid-card:nth-child(3n+1),
  .bid-card:nth-child(3n+2) {
    grid-column: span 12;
  }
}

.card-illus {
  width: 100%;
  height: 180px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(180deg, rgba(26, 24, 64, 0.06), rgba(26, 24, 64, 0.02));
  border-bottom: 1px solid rgba(26, 24, 64, 0.10);
}

.card-illus svg {
  width: 100%;
  max-width: 200px;
  height: 100%;
}

.bid-card .card-illus .line-art {
  stroke: var(--indigo);
}

.bid-card .card-illus .line-art-amber {
  stroke: var(--coral);
}

.bid-card:hover .card-illus .line-art,
.bid-card:focus-visible .card-illus .line-art {
  stroke: var(--violet);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grid);
  margin-bottom: 10px;
}

.lot-id {
  color: var(--indigo);
  font-weight: 600;
}

.lot-state {
  position: relative;
  padding-left: 14px;
}

.lot-state::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 3px rgba(224, 104, 88, 0.18);
}

.bid-card[data-lot="004"] .lot-state::before { background: var(--violet); box-shadow: 0 0 0 3px rgba(120, 80, 160, 0.18); }
.bid-card[data-lot="007"] .lot-state::before { background: var(--amber); box-shadow: 0 0 0 3px rgba(208, 160, 64, 0.22); }

.lot-title {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(28px, 2.6vw, 40px);
  line-height: 1;
  color: var(--indigo);
  margin: 0 0 10px;
  transition: transform 300ms ease;
}

.bid-card:hover .lot-title,
.bid-card:focus-visible .lot-title {
  transform: rotate(1deg) scale(1.02);
}

.lot-blurb {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.65;
  color: rgba(26, 24, 64, 0.78);
  margin: 0 0 18px;
}

.lot-bid {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grid);
  border-top: 1px solid rgba(26, 24, 64, 0.10);
  padding-top: 12px;
  margin: 0;
}

.bid-amt {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(24px, 2vw, 32px);
  letter-spacing: 0;
  text-transform: none;
  color: var(--indigo);
}

/* ==========================================================================
   Surreal Interlude
   ========================================================================== */

.interlude {
  position: relative;
  margin-top: var(--gallery-gap);
  padding: 120px 24px 140px;
  background: linear-gradient(180deg, transparent 0%, rgba(208, 160, 64, 0.04) 50%, transparent 100%);
  overflow: hidden;
  z-index: 2;
}

.interlude-strip {
  position: absolute;
  left: 0;
  right: 0;
  pointer-events: none;
  opacity: 0.7;
}

.interlude-strip svg {
  width: 100%;
  height: auto;
  display: block;
}

.interlude-strip-back {
  top: 40px;
  z-index: 1;
  opacity: 0.45;
  transform: translateX(0);
}

.interlude-strip-mid {
  top: 50%;
  transform: translateY(-50%) translateX(0);
  z-index: 2;
  opacity: 0.65;
}

.interlude-strip-front {
  bottom: 40px;
  z-index: 4;
  opacity: 0.85;
}

.interlude-text {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  text-align: center;
  z-index: 3;
}

.interlude-marker {
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 24px;
}

.interlude-quote {
  font-family: var(--font-hand);
  font-weight: 400;
  font-size: clamp(28px, 3.4vw, 52px);
  line-height: 1.25;
  color: var(--phantom);
  margin: 0 0 24px;
  letter-spacing: -0.005em;
}

.interlude-attrib {
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grid);
  margin: 0;
}

/* ==========================================================================
   Catalog (Section 03)
   ========================================================================== */

.catalog {
  position: relative;
  padding: 120px 24px 80px;
  z-index: 2;
}

.catalog-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 56px 32px;
  padding: 0 8px;
}

.catalog-block {
  grid-column: span 4;
  position: relative;
  padding-left: 24px;
  border-left: 1px solid rgba(208, 160, 64, 0.30);
  transform: translateX(8px);
  opacity: 0;
  transition: transform 800ms ease-out, opacity 800ms ease-out;
}

.catalog-block.is-revealed {
  transform: translateX(0);
  opacity: 1;
}

.catalog-block:nth-child(2) { transition-delay: 120ms; }
.catalog-block:nth-child(3) { transition-delay: 240ms; }

@media (max-width: 900px) {
  .catalog-block {
    grid-column: span 12;
  }
}

.catalog-eyebrow {
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 12px;
}

.catalog-heading {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(26px, 2.6vw, 40px);
  line-height: 1.1;
  color: var(--phantom);
  margin: 0 0 14px;
}

.catalog-body {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(240, 236, 232, 0.82);
  margin: 0;
}

/* ==========================================================================
   Closing lot footer
   ========================================================================== */

.closing-lot {
  position: relative;
  padding: 160px 24px 120px;
  margin-top: var(--gallery-gap);
  text-align: center;
  background: linear-gradient(180deg, transparent, rgba(26, 24, 64, 0.6) 60%, var(--indigo));
  overflow: hidden;
  z-index: 2;
}

.vanishing-grid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.30;
  pointer-events: none;
  z-index: 1;
}

.vanishing-grid .line-art { stroke: var(--phantom); }
.vanishing-grid .line-art-amber { stroke: var(--amber); }

.closing-text {
  position: relative;
  z-index: 2;
  max-width: var(--content-max);
  margin: 0 auto;
}

.closing-eyebrow {
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--coral);
  margin: 0 0 16px;
}

.closing-title {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(40px, 6vw, 88px);
  line-height: 1.05;
  color: var(--phantom);
  margin: 0 0 20px;
}

.closing-body {
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.05vw, 18px);
  color: var(--phantom);
  opacity: 0.85;
  max-width: 520px;
  margin: 0 auto 32px;
}

.closing-sign {
  font-family: var(--font-hand);
  font-weight: 400;
  font-size: clamp(22px, 2vw, 32px);
  color: var(--amber);
  margin: 0;
}

.closing-mark {
  color: var(--coral);
  margin: 0 6px;
}

/* ==========================================================================
   Zoom-focus overlay
   ========================================================================== */

.zoom-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 24, 64, 0);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  pointer-events: none;
  opacity: 0;
  transition: background-color 400ms ease, opacity 300ms ease;
}

.zoom-overlay.is-active {
  background: rgba(26, 24, 64, 0.72);
  pointer-events: all;
  opacity: 1;
  backdrop-filter: blur(6px);
}

.zoom-stage {
  position: relative;
  max-width: 720px;
  width: 100%;
  background: var(--parchment);
  color: var(--indigo);
  padding: 40px 44px 44px;
  border: 1px solid rgba(208, 160, 64, 0.30);
  transform: scale(0.85);
  opacity: 0;
  transition: transform 400ms cubic-bezier(0.2, 0.7, 0.2, 1), opacity 400ms ease;
}

.zoom-overlay.is-active .zoom-stage {
  transform: scale(1);
  opacity: 1;
}

.zoom-stage .card-illus {
  height: 240px;
  background: linear-gradient(180deg, rgba(26, 24, 64, 0.08), transparent);
}

.zoom-stage .card-illus svg {
  max-width: 280px;
}

.zoom-stage .lot-title {
  font-size: clamp(40px, 4vw, 64px);
  margin-bottom: 16px;
}

.zoom-stage .lot-blurb {
  font-size: 16px;
  line-height: 1.7;
}

.zoom-close {
  position: absolute;
  top: 32px;
  right: 32px;
  background: transparent;
  border: 1px solid rgba(240, 236, 232, 0.4);
  color: var(--phantom);
  padding: 8px 18px;
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 200ms ease, border-color 200ms ease;
}

.zoom-close:hover {
  background: rgba(208, 160, 64, 0.18);
  border-color: var(--amber);
  color: var(--amber);
}

/* ==========================================================================
   Reveal helpers
   ========================================================================== */

.is-pre-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 800ms ease-out, transform 800ms ease-out;
}

.is-pre-reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 720px) {
  .hall-corner-tl { top: 20px; left: 20px; }
  .hall-corner-br { bottom: 20px; right: 20px; }
  .floating-illus { width: 220px; height: 220px; }
  .illus-large { width: 260px; height: 260px; }
  .illus-medium { width: 180px; height: 180px; }
  .bid-gallery { padding: 80px 18px 60px; }
  .catalog { padding: 80px 18px 60px; }
  .interlude { padding: 80px 18px 100px; }
  .closing-lot { padding: 120px 18px 100px; }
  .zoom-stage { padding: 28px 24px 32px; }
  .zoom-close { top: 16px; right: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .grid-frame,
  .duotone-wash,
  .floating-illus,
  .kicker,
  .hall-title,
  .hall-subtitle,
  .hall-bid,
  .hall-meta,
  .bid-card,
  .catalog-block,
  .is-pre-reveal {
    transition: none !important;
    animation: none !important;
  }
  .cue-line { animation: none; }
}