/* ═══════════════════════════════════════════════════════════
   ATELIER — CUSTOM RING BUILDER
   Luxury Jewellery Aesthetic | styles.css
═══════════════════════════════════════════════════════════ */

/* ─── CSS VARIABLES ─────────────────────────────────────── */
:root {
  --gold:         #D2B986;
  --gold-light:   #E8D5A8;
  --gold-dark:    #A8905A;
  --bg:           #EAE9E1;
  --bg-card:      rgba(255,255,255,0.55);
  --text:         #1F1F1F;
  --text-muted:   #7A7060;
  --white:        #FFFFFF;
  --border:       rgba(210,185,134,0.35);
  --border-sel:   #D2B986;
  --shadow-sm:    0 2px 12px rgba(0,0,0,0.06);
  --shadow-md:    0 8px 32px rgba(0,0,0,0.10);
  --shadow-lg:    0 20px 60px rgba(0,0,0,0.14);
  --blur:         blur(14px);
  --radius:       14px;
  --radius-sm:    8px;
  --transition:   0.3s cubic-bezier(0.4,0,0.2,1);
  --font-serif:   'Cormorant Garamond', Georgia, serif;
  --font-sans:    'Jost', system-ui, sans-serif;
}

/* ─── RESET ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }
ul { list-style: none; }

/* ─── BACKGROUND TEXTURE ────────────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    radial-gradient(ellipse 80% 60% at 15% 10%, rgba(210,185,134,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 85% 90%, rgba(210,185,134,0.08) 0%, transparent 55%);
  pointer-events: none; z-index: 0;
}

/* ─── HEADER ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  background: rgba(234,233,225,0.82);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 16px 32px;
  display: flex; align-items: center; gap: 20px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { font-size: 20px; color: var(--gold); }
.logo-text {
  font-family: var(--font-serif);
  font-size: 26px; font-weight: 500;
  letter-spacing: 0.12em; color: var(--text);
}
.header-tagline {
  font-size: 12px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-muted);
  margin-left: auto;
}

/* ─── HERO STRIP ─────────────────────────────────────────── */
.hero-strip {
  text-align: center; padding: 52px 32px 36px;
  position: relative; z-index: 1;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 300; letter-spacing: 0.04em;
  line-height: 1.15; color: var(--text);
  margin-bottom: 12px;
}
.hero-title em {
  font-style: italic; color: var(--gold-dark);
}
.hero-sub {
  font-size: 14px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-muted);
}

/* ─── PROGRESS NAV ───────────────────────────────────────── */
.progress-nav {
  position: relative; z-index: 1;
  max-width: 860px; margin: 0 auto 48px;
  padding: 0 32px;
}
.progress-track {
  position: absolute; top: 20px; left: calc(32px + 20px); right: calc(32px + 20px);
  height: 2px; background: var(--border);
  border-radius: 2px; z-index: 0;
}
.progress-track::after {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold));
  border-radius: 2px;
  width: var(--progress-w, 0%);
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
}
.step-list {
  display: flex; justify-content: space-between;
  align-items: flex-start; position: relative; z-index: 1;
  gap: 0;
}
.step-item {
  display: flex; flex-direction: column;
  align-items: center; gap: 8px; flex: 1;
  cursor: pointer;
}
.step-circle {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 500; letter-spacing: 0.05em;
  border: 2px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  transition: var(--transition);
  position: relative;
}
.step-item.active .step-circle {
  border-color: var(--gold);
  background: var(--gold);
  color: var(--white);
  box-shadow: 0 0 0 5px rgba(210,185,134,0.22);
}
.step-item.completed .step-circle {
  border-color: var(--gold-dark);
  background: var(--gold-dark);
  color: var(--white);
}
.step-item.completed .step-circle::after {
  content: '✓'; font-size: 16px; font-weight: 600;
}
.step-name {
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted);
  text-align: center; max-width: 72px; line-height: 1.3;
  transition: color var(--transition);
}
.step-item.active .step-name { color: var(--gold-dark); font-weight: 500; }
.step-item.completed .step-name { color: var(--text); }

/* ─── BUILDER LAYOUT ─────────────────────────────────────── */
.builder-layout {
  max-width: 1280px; margin: 0 auto;
  padding: 0 32px 80px;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  position: relative; z-index: 1;
  align-items: start;
}

/* ─── BUILDER PANEL ──────────────────────────────────────── */
.builder-panel {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 40px;
  min-height: 520px;
  display: flex; flex-direction: column;
}

/* ─── STEP PANELS ────────────────────────────────────────── */
.step-panel { display: flex; flex-direction: column; flex: 1; }
.step-panel.hidden { display: none; }

.step-heading {
  font-family: var(--font-serif);
  font-size: 28px; font-weight: 400;
  letter-spacing: 0.02em; margin-bottom: 6px;
  display: flex; align-items: baseline; gap: 14px;
}
.step-num {
  font-size: 13px; letter-spacing: 0.2em;
  color: var(--gold); font-family: var(--font-sans);
  font-weight: 300;
}
.step-desc {
  color: var(--text-muted); font-size: 14px;
  margin-bottom: 28px; letter-spacing: 0.03em;
}

/* ─── OPTION CARDS GRID ──────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px; margin-bottom: 24px;
}
.card-grid--5 { grid-template-columns: repeat(5, 1fr); }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }

/* ─── OPTION CARD ────────────────────────────────────────── */
.option-card {
  position: relative; overflow: hidden;
  background: rgba(255,255,255,0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 12px;
  display: flex; flex-direction: column;
  align-items: center; gap: 8px;
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition),
              box-shadow var(--transition),
              border-color var(--transition),
              background var(--transition);
  box-shadow: var(--shadow-sm);
  user-select: none;
}
.option-card--lg { padding: 28px 16px; }

/* Gold shimmer on hover */
.option-card::after {
  content: '';
  position: absolute; top: 0; left: -100%;
  width: 60%; height: 100%;
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(210,185,134,0.28) 50%,
    transparent 70%
  );
  transform: skewX(-15deg);
  transition: left 0s;
}
.option-card:hover::after {
  left: 150%;
  transition: left 0.55s ease;
}
.option-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold-light);
  background: rgba(255,255,255,0.72);
}
.option-card.selected {
  border-color: var(--gold);
  background: rgba(210,185,134,0.14);
  box-shadow: 0 0 0 3px rgba(210,185,134,0.28), var(--shadow-sm);
}
.option-card.selected::before {
  content: '✓';
  position: absolute; top: 6px; right: 8px;
  font-size: 11px; color: var(--gold-dark); font-weight: 600;
}
.card-icon {
  font-size: 22px; line-height: 1;
}
.card-label {
  font-size: 13px; font-weight: 500;
  letter-spacing: 0.05em; color: var(--text);
}
.card-sub {
  font-size: 11px; color: var(--text-muted);
  letter-spacing: 0.04em; margin-top: 2px;
}

/* ─── STEP ERROR ─────────────────────────────────────────── */
.step-error {
  font-size: 12px; color: #A05030;
  letter-spacing: 0.06em; padding: 8px 0;
  display: none;
}
.step-error.show { display: block; }

/* ─── PREFERENCES ────────────────────────────────────────── */
.pref-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px; margin-bottom: 24px;
}
.pref-group { display: flex; flex-direction: column; gap: 10px; }
.pref-label {
  font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-muted);
  font-weight: 500;
}
.pref-hint { font-size: 10px; color: var(--gold); }
.pref-input {
  background: rgba(255,255,255,0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 15px; color: var(--text);
  outline: none; width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.pref-input:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(210,185,134,0.2);
}

/* Toggle Buttons */
.toggle-group {
  display: flex; gap: 10px;
}
.toggle-btn {
  flex: 1; padding: 11px 8px;
  font-size: 13px; letter-spacing: 0.06em;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.5);
  backdrop-filter: blur(6px);
  color: var(--text-muted);
  transition: var(--transition);
}
.toggle-btn:hover { border-color: var(--gold-light); color: var(--text); }
.toggle-btn.active {
  border-color: var(--gold);
  background: rgba(210,185,134,0.18);
  color: var(--text); font-weight: 500;
  box-shadow: 0 0 0 2px rgba(210,185,134,0.22);
}

/* Color Swatches */
.color-swatch-group { display: flex; gap: 12px; align-items: center; }
.swatch-btn {
  width: 34px; height: 34px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.4);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
}
.swatch-btn:hover { transform: scale(1.12); box-shadow: 0 4px 14px rgba(0,0,0,0.2); }
.swatch-btn.active {
  border-color: var(--text);
  box-shadow: 0 0 0 3px rgba(210,185,134,0.4), 0 4px 14px rgba(0,0,0,0.2);
  transform: scale(1.12);
}
.color-label {
  font-size: 12px; color: var(--text-muted);
  letter-spacing: 0.06em;
}

/* ─── CONTACT FORM ───────────────────────────────────────── */
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-label {
  font-size: 12px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-muted); font-weight: 500;
}
.form-input {
  background: rgba(255,255,255,0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 16px; font-size: 15px; color: var(--text);
  outline: none; width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-input:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(210,185,134,0.2);
}
.form-textarea { min-height: 110px; resize: vertical; }

/* ─── SUBMIT BUTTON ──────────────────────────────────────── */
.submit-btn {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--gold-dark) 0%, var(--gold) 60%, var(--gold-light) 100%);
  color: var(--white);
  padding: 16px 40px; border-radius: 60px;
  font-family: var(--font-sans);
  font-size: 13px; font-weight: 500; letter-spacing: 0.2em;
  text-transform: uppercase;
  align-self: flex-start;
  box-shadow: 0 4px 24px rgba(168,144,90,0.4);
  transition: transform var(--transition), box-shadow var(--transition);
}
.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(168,144,90,0.55);
}
.submit-btn:active { transform: translateY(0); }
.btn-shimmer {
  position: absolute; top: 0; left: -100%; width: 55%; height: 100%;
  background: linear-gradient(105deg, transparent 30%, rgba(255,255,255,0.3) 50%, transparent 70%);
  transform: skewX(-15deg);
}
.submit-btn:hover .btn-shimmer {
  animation: btnShimmer 0.7s ease forwards;
}
@keyframes btnShimmer {
  0%   { left: -100%; }
  100% { left: 150%; }
}

.submit-success {
  background: rgba(210,185,134,0.15);
  border: 1px solid var(--gold-light);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  display: flex; align-items: center; gap: 14px;
  font-size: 14px; color: var(--text);
}
.submit-success.hidden { display: none; }
.success-icon { font-size: 22px; color: var(--gold); }

/* ─── STEP NAVIGATION ────────────────────────────────────── */
.step-nav {
  margin-top: auto; padding-top: 32px;
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--border);
}
.nav-btn {
  padding: 13px 32px; border-radius: 60px;
  font-size: 13px; letter-spacing: 0.14em; font-weight: 500;
  text-transform: uppercase;
  transition: var(--transition);
}
.nav-btn--next {
  background: var(--text); color: var(--white);
  box-shadow: var(--shadow-sm);
}
.nav-btn--next:hover {
  background: var(--gold-dark); color: var(--white);
  box-shadow: 0 4px 20px rgba(168,144,90,0.4);
  transform: translateY(-2px);
}
.nav-btn--back {
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border);
}
.nav-btn--back:hover { border-color: var(--gold); color: var(--text); }

/* Post-submission redirect button */
.nav-btn--goto-site {
  background: transparent;
  color: var(--gold-dark);
  border: 1px solid var(--gold);
  font-weight: 500;
}
.nav-btn--goto-site:hover {
  background: rgba(210,185,134,0.12);
  border-color: var(--gold-dark);
  color: var(--text);
  transform: translateY(-1px);
}

/* ─── PREVIEW PANEL ──────────────────────────────────────── */
.preview-panel {
  display: flex; flex-direction: column; gap: 20px;
  position: sticky; top: 88px;
}

/* Preview Card */
.preview-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.preview-label {
  font-size: 10px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-muted);
  padding: 14px 20px 0; font-weight: 500;
}
.preview-img-wrapper {
  position: relative; overflow: hidden;
  aspect-ratio: 1 / 1;
  margin: 14px;
  border-radius: 10px;
}
.preview-img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: opacity 0.5s ease;
  border-radius: 10px;
}
.preview-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(234,233,225,0.5) 100%);
  pointer-events: none;
}
.preview-caption {
  font-family: var(--font-serif);
  font-size: 13px; font-style: italic;
  color: var(--text-muted); text-align: center;
  padding: 0 20px 16px; letter-spacing: 0.04em;
}

/* Price Card */
.price-card {
  background: linear-gradient(135deg, rgba(168,144,90,0.12) 0%, rgba(210,185,134,0.08) 100%);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--gold-light);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.price-label {
  font-size: 10px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 12px; font-weight: 500;
}
.price-amount { display: flex; align-items: baseline; gap: 6px; margin-bottom: 16px; }
.price-currency {
  font-size: 12px; letter-spacing: 0.1em;
  color: var(--gold-dark); font-weight: 500;
}
.price-value {
  font-family: var(--font-serif);
  font-size: 40px; font-weight: 300; letter-spacing: -0.01em;
  color: var(--text);
  transition: color 0.3s;
}
.price-breakdown { border-top: 1px solid var(--border); padding-top: 12px; display: flex; flex-direction: column; gap: 6px; }
.breakdown-row {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--text-muted); letter-spacing: 0.04em;
}
.breakdown-row span:last-child { color: var(--text); }
.price-note { font-size: 11px; color: var(--text-muted); margin-top: 12px; font-style: italic; letter-spacing: 0.04em; }

/* Summary Card */
.summary-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.summary-label {
  font-size: 10px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 14px; font-weight: 500;
}
.summary-list { display: flex; flex-direction: column; gap: 8px; }
.summary-item {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px;
  animation: fadeSlideIn 0.35s ease;
}
.summary-item .s-key { color: var(--text-muted); letter-spacing: 0.05em; }
.summary-item .s-val { color: var(--text); font-weight: 500; letter-spacing: 0.03em; }
.summary-empty { color: var(--text-muted); font-size: 13px; font-style: italic; }

/* ─── ANIMATIONS ─────────────────────────────────────────── */
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes stepFadeIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}
.step-panel:not(.hidden) {
  animation: stepFadeIn 0.45s cubic-bezier(0.4,0,0.2,1);
}
@keyframes priceFlash {
  0%   { color: var(--gold); }
  100% { color: var(--text); }
}
.price-value.flash { animation: priceFlash 0.6s ease; }

/* ─── FOOTER ─────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 28px 32px;
  border-top: 1px solid var(--border);
  font-size: 12px; letter-spacing: 0.12em;
  color: var(--text-muted); position: relative; z-index: 1;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — TABLET
═══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .builder-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .preview-panel {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    order: -1;
  }
  .preview-card { grid-column: 1 / -1; }
  .card-grid { grid-template-columns: repeat(4, 1fr); }
  .card-grid--5 { grid-template-columns: repeat(5, 1fr); }
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — MOBILE
═══════════════════════════════════════════════════════════ */
@media (max-width: 680px) {
  .header-inner { padding: 14px 20px; }
  .header-tagline { display: none; }
  .hero-strip { padding: 36px 20px 24px; }
  .progress-nav { padding: 0 16px; }
  .step-name { display: none; }
  .step-circle { width: 32px; height: 32px; font-size: 11px; }
  .progress-track { top: 16px; left: calc(16px + 16px); right: calc(16px + 16px); }

  .builder-layout { padding: 0 16px 60px; }
  .builder-panel { padding: 24px 18px; }

  .card-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .card-grid--5 { grid-template-columns: repeat(3, 1fr); }
  .card-grid--3 { grid-template-columns: 1fr; }

  .pref-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }

  .preview-panel { grid-template-columns: 1fr; }

  .step-heading { font-size: 22px; }
  .submit-btn { width: 100%; text-align: center; }

  .step-nav { gap: 12px; }
  .nav-btn { padding: 12px 22px; font-size: 12px; }
}