/* =========================================================
   Pablo Marble & Granite — AI Visualizer
   Palette/type matched to the live site (pablomarbleandgranite.com):
   brand blue #005B9E (headings/links), gold accent from the
   logo mark, Kanit for display type, Roboto for body copy,
   white page background, light-gray footer.
   ========================================================= */

:root {
  --color-ink: #1c1c1c;
  --color-navy: #003a66;
  --color-blue: #005b9e;
  --color-blue-dark: #00446f;
  --color-gold: #f2a93b;
  --color-gold-dark: #d98f1e;
  --color-white: #ffffff;
  --color-cream: #f7f8f9;
  --color-cream-deep: #eef1f4;
  --color-gray: #7a7a7a;
  --color-border: #e2e6ea;
  --shadow-soft: 0 12px 30px rgba(0, 43, 77, 0.08);
  --shadow-lift: 0 18px 40px rgba(0, 43, 77, 0.14);
  --radius: 14px;
  --font-display: "Kanit", "Segoe UI", Arial, sans-serif;
  --font-body: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-white);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0 0 .5em; letter-spacing: .01em; color: var(--color-blue); }
p { margin: 0 0 1em; }
a { color: var(--color-blue); }
img { max-width: 100%; display: block; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.muted { color: var(--color-gray); font-size: .92rem; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5em;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .02em;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, opacity .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--color-blue);
  color: #fff;
  box-shadow: var(--shadow-soft);
}
.btn-primary:hover { background: var(--color-blue-dark); box-shadow: var(--shadow-lift); }
.btn-primary:disabled {
  background: #cfd6dc; color: #8b96a1; cursor: not-allowed; box-shadow: none;
}
.btn-ghost {
  background: transparent;
  color: var(--color-blue);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-cream-deep); }
.btn-lg { padding: 16px 36px; font-size: 1rem; }
.btn-sm { padding: 8px 16px; font-size: .82rem; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; gap: 24px; }
.brand { display: flex; align-items: center; text-decoration: none; }
.brand-logo { height: 44px; width: auto; }
.footer-logo { height: 40px; width: auto; margin-bottom: 12px; }
.site-nav { display: flex; align-items: center; gap: 26px; font-size: .92rem; font-weight: 500; }
.site-nav a { text-decoration: none; color: var(--color-ink); opacity: .85; }
.site-nav a:hover { opacity: 1; color: var(--color-blue); }
.site-nav a.nav-current { color: var(--color-blue); opacity: 1; font-weight: 700; }
.nav-cta {
  padding: 10px 20px; border-radius: 6px; background: var(--color-blue); color: #fff !important; opacity: 1 !important;
}
.nav-cta:hover { background: var(--color-blue-dark); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--color-ink); display: block; }

/* Hero */
.hero {
  background:
    radial-gradient(circle at 15% 20%, rgba(242,169,59,.10), transparent 45%),
    linear-gradient(180deg, var(--color-cream-deep), var(--color-white));
  padding: 88px 0 72px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}
.hero-inner { max-width: 760px; }
.eyebrow {
  text-transform: uppercase; letter-spacing: .18em; font-size: .78rem; font-weight: 700;
  color: var(--color-gold-dark); margin-bottom: 14px;
}
.hero h1 { font-size: clamp(2.1rem, 4vw, 3.2rem); margin-bottom: .4em; }
.hero-copy { color: var(--color-gray); font-size: 1.06rem; max-width: 620px; margin-left: auto; margin-right: auto; }

/* Steps nav */
.visualizer { padding: 64px 24px 96px; }
.steps {
  list-style: none; display: flex; justify-content: center; gap: 10px;
  padding: 0; margin: 0 0 48px; flex-wrap: wrap;
}
.step {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  color: var(--color-gray);
  font-size: .9rem; font-weight: 600;
  background: var(--color-white);
}
.step-num {
  width: 22px; height: 22px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-border); color: var(--color-ink); font-size: .78rem;
}
.step.is-active { border-color: var(--color-blue); color: var(--color-ink); box-shadow: var(--shadow-soft); }
.step.is-active .step-num { background: var(--color-blue); color: #fff; }
.step.is-done .step-num { background: var(--color-gold); color: #fff; }

/* Panels */
.panel, .loading-panel, .result-panel {
  display: none;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 44px;
  box-shadow: var(--shadow-soft);
}
.panel.is-active, .loading-panel:not([hidden]), .result-panel:not([hidden]) { display: block; }
.panel h2 { font-size: 1.6rem; }
.panel-copy { color: var(--color-gray); margin-bottom: 28px; }
.panel-actions { display: flex; justify-content: space-between; gap: 16px; margin-top: 32px; }
.panel-actions .btn:only-child { margin-left: auto; }

/* Material grid */
.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 18px;
}
.material-card {
  position: relative;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--color-white);
  text-align: left;
  padding: 0;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.material-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-soft); }
.material-card.is-selected { border-color: var(--color-blue); box-shadow: var(--shadow-lift); }
.material-swatch { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; display: block; background: var(--color-cream-deep); }
.material-info { padding: 14px 16px 16px; }
.material-name { font-weight: 700; font-size: .98rem; margin-bottom: 2px; color: var(--color-ink); }
.material-desc { font-size: .82rem; color: var(--color-gray); margin: 0; }
.material-check {
  position: absolute; top: 10px; right: 10px;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--color-gold); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: .85rem; opacity: 0; transform: scale(.6);
  transition: opacity .15s ease, transform .15s ease;
}
.material-card.is-selected .material-check { opacity: 1; transform: scale(1); }

/* Uploader */
.uploader {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  min-height: 260px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-cream);
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
  padding: 24px;
}
.uploader:hover, .uploader.is-dragover { border-color: var(--color-blue); background: var(--color-cream-deep); }
.uploader-empty { text-align: center; color: var(--color-gray); }
.uploader-empty svg { color: var(--color-blue); margin-bottom: 10px; }
.uploader-empty strong { color: var(--color-ink); }
.uploader-preview { display: flex; flex-direction: column; align-items: center; gap: 14px; width: 100%; }
.uploader-preview img { max-height: 340px; border-radius: 10px; box-shadow: var(--shadow-soft); }
.hint { font-size: .85rem; color: var(--color-gray); margin-top: 14px; }

/* Summary cards (step 3) */
.summary-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.summary-card {
  border: 1px solid var(--color-border); border-radius: var(--radius); padding: 18px; background: var(--color-cream);
}
.summary-label { display: block; text-transform: uppercase; font-size: .72rem; letter-spacing: .1em; color: var(--color-gray); margin-bottom: 10px; font-weight: 700; }
.summary-value { display: flex; align-items: center; gap: 12px; }
.summary-value img { width: 64px; height: 64px; object-fit: cover; border-radius: 10px; }
#summaryPhoto { width: 100%; height: 140px; object-fit: cover; border-radius: 10px; }
.error-msg { color: #a12f2f; background: #fbeaea; border: 1px solid #f0c6c6; padding: 12px 16px; border-radius: 10px; margin-top: 20px; }

/* Loading */
.loading-panel { text-align: center; padding: 72px 44px; }
.spinner {
  width: 56px; height: 56px; margin: 0 auto 28px;
  border-radius: 50%;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-blue);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress-track { max-width: 320px; height: 6px; margin: 28px auto 0; background: var(--color-border); border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--color-blue), var(--color-gold)); animation: progress 12s ease-out forwards; }
@keyframes progress { 0% { width: 4%; } 100% { width: 92%; } }

/* Result */
.compare {
  position: relative; width: 100%; aspect-ratio: 4 / 3; max-height: 640px;
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lift);
  background: var(--color-cream-deep);
}
.compare-after { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.result-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; justify-content: center; }

/* Footer */
.site-footer { border-top: 1px solid var(--color-border); padding: 40px 0; background: var(--color-cream); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; }
.footer-inner a { color: var(--color-blue); text-decoration: none; }
.footer-inner a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 860px) {
  .site-nav { position: fixed; inset: 68px 0 0 0; background: var(--color-white); flex-direction: column; align-items: flex-start; padding: 24px; gap: 18px; transform: translateX(100%); transition: transform .2s ease; }
  .site-nav.is-open { transform: translateX(0); }
  .nav-toggle { display: flex; }
  .panel, .loading-panel, .result-panel { padding: 28px; }
  .material-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .material-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .steps { gap: 8px; }
  .step { padding: 8px 14px; font-size: .8rem; }
  .panel-actions { flex-direction: column-reverse; }
  .panel-actions .btn { width: 100%; }
  .result-actions { flex-direction: column; }
  .result-actions .btn { width: 100%; }
}