/* ============================================================
   Optika × Click My Site — Configurateur Cartier Diamond Cut
   Style luxe minimaliste, sobriété, élégance.
   ============================================================ */

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

html,
body {
  margin: 0;
  padding: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* ---------- Variables ---------- */
:root {
  --bg: #faf8f3;
  --bg-alt: #f3efe6;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-faint: #8a8680;
  --line: #e5e1d6;
  --line-strong: #c9c3b3;
  --gold: #c9a961;
  --gold-deep: #a8893f;
  --white: #ffffff;

  --serif: "Cormorant Garamond", "Playfair Display", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --radius: 4px;
  --transition: 220ms ease;
  --fade: 600ms ease-in-out;
  --blur-duration: 350ms;
}

/* ---------- Base ---------- */
body {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* ---------- Layout 60/40 ---------- */
.layout {
  display: grid;
  grid-template-columns: 60fr 40fr;
  min-height: 100vh;
}

/* ============================================================
   COLONNE GAUCHE — Stage (visualisation)
   ============================================================ */
.stage {
  position: relative;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255, 255, 255, 0.85), transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(201, 169, 97, 0.07), transparent 55%),
    linear-gradient(135deg, #f7f3ea 0%, #ede7d8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px;
  overflow: hidden;
}

/* Subtile texture marbrée */
.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 35%, rgba(255, 255, 255, 0.4) 0%, transparent 25%),
    radial-gradient(circle at 85% 65%, rgba(201, 169, 97, 0.05) 0%, transparent 30%),
    radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.015) 0%, transparent 70%);
  pointer-events: none;
}

.stage-inner {
  position: relative;
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.frame-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Les deux <img> superposés pour le crossfade */
.frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition:
    opacity var(--fade),
    filter var(--blur-duration) ease-out;
  filter: drop-shadow(0 24px 38px rgba(0, 0, 0, 0.14));
  user-select: none;
  -webkit-user-drag: none;
  will-change: opacity, filter;
}

.frame.is-visible {
  opacity: 1;
}

/* Pendant la transition : flou prononcé sur les deux frames */
.frame-wrapper.is-loading .frame {
  filter:
    blur(18px)
    drop-shadow(0 24px 38px rgba(0, 0, 0, 0.14));
}

/* ---------- Jauge de chargement (spinner) ---------- */
.loader {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 56px;
  height: 56px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 220ms ease;
  z-index: 2;
}

.frame-wrapper.is-loading .loader {
  opacity: 1;
}

.loader-ring {
  width: 100%;
  height: 100%;
  animation: loader-rotate 1s linear infinite;
}

.frame-wrapper.is-loading .loader-ring {
  /* L'animation ne tourne que pendant le chargement */
  animation-play-state: running;
}

.loader-track {
  fill: none;
  stroke: rgba(26, 26, 26, 0.08);
  stroke-width: 3;
}

.loader-arc {
  fill: none;
  stroke: var(--gold-deep);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 90 200;
  stroke-dashoffset: 0;
  transform-origin: center;
}

@keyframes loader-rotate {
  to {
    transform: rotate(360deg);
  }
}

.stage-caption {
  margin: 0;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}

/* ============================================================
   COLONNE DROITE — Panel (configurateur)
   ============================================================ */
.panel {
  background: var(--bg);
  padding: 64px 56px 40px;
  display: flex;
  flex-direction: column;
  gap: 48px;
  border-left: 1px solid var(--line);
}

.panel-header {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.eyebrow {
  margin: 0;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 2.6vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.title em {
  font-style: italic;
  font-weight: 400;
  color: var(--gold-deep);
}

/* ---------- Options ---------- */
.options {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.option-group {
  border: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.option-label {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0;
}

.option-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* ---------- Boutons d'option ---------- */
.opt {
  min-height: 52px;
  padding: 0 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  transition:
    background var(--transition),
    color var(--transition),
    border-color var(--transition),
    transform 120ms ease;
  position: relative;
}

.opt:hover {
  background: var(--bg-alt);
  border-color: var(--line-strong);
}

.opt:active {
  transform: scale(0.98);
}

.opt:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* État sélectionné — fond anthracite, accent doré subtil */
.opt[aria-checked="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
  box-shadow: 0 1px 0 rgba(201, 169, 97, 0.4) inset;
}

.opt[aria-checked="true"]::after {
  content: "";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 2px rgba(201, 169, 97, 0.18);
}

.opt[aria-checked="true"] {
  padding-left: 28px;
}

/* ---------- Footer ---------- */
.footer {
  margin-top: auto;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.footer-text {
  margin: 0;
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}

.footer-link {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--gold-deep);
}

.sep {
  margin: 0 6px;
  color: var(--line-strong);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .stage {
    padding: 40px 24px;
    min-height: 50vh;
  }

  .panel {
    padding: 40px 28px 32px;
    border-left: none;
    border-top: 1px solid var(--line);
    gap: 36px;
  }

  .frame-wrapper {
    aspect-ratio: 4 / 3;
    max-width: 520px;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .stage {
    padding: 32px 16px;
  }

  .panel {
    padding: 32px 20px 24px;
  }

  .options {
    gap: 28px;
  }

  .opt {
    min-height: 48px;
    font-size: 13.5px;
  }
}

/* ---------- Préférences de mouvement réduit ---------- */
@media (prefers-reduced-motion: reduce) {
  .frame {
    transition: opacity 0ms;
  }
  .frame-wrapper.is-loading .frame {
    filter: drop-shadow(0 24px 38px rgba(0, 0, 0, 0.14));
  }
  .loader-ring {
    animation: none;
  }
  .opt,
  .footer-link {
    transition: none;
  }
}