/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --ink: #15151b;
  --ink-soft: #3a3a45;
  --cream: #f7f5f0;
  --panel: #ffffff;
  --border: rgba(21, 21, 27, 0.12);
  --border-strong: rgba(21, 21, 27, 0.22);
  --accent: #ff6a3d;
  --accent-ink: #15151b;
  --muted: #6c6c78;
  --ok: #1f8a4c;
  --warn: #b3760c;
  --error: #c23a2b;

  --display: "Space Grotesk", system-ui, sans-serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "Consolas", monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 14px;
  --radius-sm: 9px;
  --gutter: clamp(1.1rem, 4vw, 2.4rem);
  --container: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f1ec;
    --ink-soft: #c7c6c0;
    --cream: #131318;
    --panel: #1b1b22;
    --border: rgba(242, 241, 236, 0.14);
    --border-strong: rgba(242, 241, 236, 0.24);
    --muted: #9b9aa5;
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { font-family: var(--display); text-wrap: balance; line-height: 1.08; letter-spacing: -0.01em; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
input, select { font: inherit; color: inherit; }

/* =============================================================
   3. Utilities
   ============================================================= */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.skip-link {
  position: fixed; top: -100px; left: 1rem; padding: .6rem 1rem;
  background: var(--ink); color: var(--cream); z-index: 9999; border-radius: 8px; font-weight: 500;
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   4. Typography
   ============================================================= */
h1 { font-size: clamp(1.9rem, 4.4vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: .8rem; }
h3 { font-size: 1.05rem; }

/* =============================================================
   5. Components
   ============================================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .85rem 1.3rem; border-radius: 999px; font-weight: 600; font-size: .96rem;
  transition: transform .18s var(--ease-out), background .18s var(--ease-out), box-shadow .18s var(--ease-out);
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #17110c; }
.btn-secondary { background: var(--ink); color: var(--cream); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--border-strong); }
@media (hover: hover) {
  .btn-primary:hover, .btn-secondary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px -12px rgba(0,0,0,.35); }
  .btn-ghost:hover { border-color: var(--ink); }
}
.btn-lg { padding: 1rem 1.5rem; font-size: 1.02rem; flex: 1 1 auto; }

.field-label { display: block; font-size: .82rem; font-weight: 600; color: var(--ink-soft); margin: 1rem 0 .4rem; }
.field-group:first-child .field-label { margin-top: 0; }
input[type="text"], input[type="range"], select {
  width: 100%; padding: .7rem .85rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: var(--panel); color: var(--ink);
}
input[type="color"] {
  width: 100%; height: 44px; padding: 3px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: var(--panel);
}
.field-row { display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: end; }
.check-label { display: flex; align-items: center; gap: .5rem; font-size: .88rem; padding-bottom: .7rem; white-space: nowrap; }
.divider { border: 0; border-top: 1px solid var(--border); margin: 1.4rem 0; }

.seg-tabs { display: flex; gap: .4rem; background: var(--cream); border: 1px solid var(--border); border-radius: 999px; padding: 4px; }
.seg-tab { flex: 1; padding: .55rem 1rem; border-radius: 999px; font-weight: 600; font-size: .9rem; color: var(--muted); transition: background .18s var(--ease-out), color .18s var(--ease-out); }
.seg-tab.is-active { background: var(--ink); color: var(--cream); }

.style-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; }
.style-grid.three-col { grid-template-columns: repeat(3, 1fr); }
.style-opt {
  padding: .6rem .5rem; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  font-size: .85rem; font-weight: 600; text-align: center; transition: border-color .18s var(--ease-out), background .18s var(--ease-out);
}
.style-opt.is-active { background: var(--ink); color: var(--cream); border-color: var(--ink); }
@media (hover: hover) { .style-opt:not(.is-active):hover { border-color: var(--ink); } }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.center-picker { display: flex; flex-direction: column; gap: .7rem; }
.emoji-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: .3rem; }
.emoji-opt {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; border-radius: var(--radius-sm); border: 1px solid transparent;
}
.emoji-opt.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); }
@media (hover: hover) { .emoji-opt:hover { background: var(--border); } }
.center-actions { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.upload-btn { padding: .55rem 1rem; border-radius: 999px; border: 1px solid var(--border-strong); font-size: .85rem; font-weight: 600; }
.link-btn { font-size: .85rem; font-weight: 600; color: var(--muted); text-decoration: underline; text-underline-offset: 3px; }

.warnings { margin-top: 1.1rem; display: flex; flex-direction: column; gap: .4rem; }
.warn-line { font-size: .82rem; padding: .5rem .7rem; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.warn-ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 35%, var(--border)); }
.warn-warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 35%, var(--border)); }
.warn-error { color: var(--error); border-color: color-mix(in srgb, var(--error) 35%, var(--border)); }
.warn-info { color: var(--muted); }

.ad-slot {
  min-height: 90px; border: 1px dashed var(--border-strong); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
  margin: 2.2rem auto;
}
.ad-leaderboard { max-width: 728px; }
.ad-incontent { max-width: 468px; }
.ad-dialog-slot { min-height: 250px; width: 300px; margin: 0; }
.ad-corner-slot { min-height: 60px; width: 100%; margin: 0; }

.ad-dialog { border: 0; border-radius: var(--radius); padding: 1.4rem; background: var(--panel); color: var(--ink); max-width: 340px; }
.ad-dialog::backdrop { background: rgba(10,10,14,.55); }
.dialog-close { position: absolute; top: .7rem; right: .8rem; font-size: 1rem; width: 30px; height: 30px; border-radius: 50%; }
@media (hover: hover) { .dialog-close:hover, .corner-close:hover { background: var(--border); } }
.ad-dialog .btn { width: 100%; margin-top: 1rem; }

.ad-corner {
  position: fixed; right: 1rem; bottom: 1rem; width: 220px; background: var(--panel);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm); padding: .6rem;
  box-shadow: 0 14px 34px -18px rgba(0,0,0,.4); z-index: 400;
  opacity: 0; transform: translateY(16px); pointer-events: none;
  transition: opacity .3s var(--ease-out), transform .3s var(--ease-out);
}
.ad-corner.is-shown { opacity: 1; transform: translateY(0); pointer-events: auto; }
.corner-close { position: absolute; top: -10px; right: -10px; width: 24px; height: 24px; border-radius: 50%; background: var(--ink); color: var(--cream); font-size: .7rem; }

/* =============================================================
   6. Sections
   ============================================================= */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem var(--gutter); max-width: var(--container); margin: 0 auto;
}
.logo { font-family: var(--display); font-weight: 700; font-size: 1.2rem; letter-spacing: -.02em; }
.site-nav { display: flex; gap: 1.6rem; font-size: .9rem; font-weight: 500; }
@media (hover: hover) { .site-nav a:hover { color: var(--accent); } }

.hero { padding: 1.6rem 0 2.4rem; max-width: 760px; }
.hero-sub { margin-top: .9rem; font-size: 1.08rem; color: var(--ink-soft); }

.tool-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 20px;
  padding: clamp(1.2rem, 3vw, 2.2rem); box-shadow: 0 30px 60px -40px rgba(0,0,0,.25);
}
.tool-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; }
/* Mobile: show the live QR result first (order -1) so the tool "works" above the fold
   even though the full control panel is long — the 3D viewer/downloads stay with it. */
.tool-preview { display: flex; flex-direction: column; gap: .9rem; order: -1; }
.preview-2d {
  background: var(--cream); border: 1px solid var(--border); border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center; padding: 1rem; min-height: 220px;
}
.qr-canvas-wrap canvas { border-radius: 8px; }
.preview-3d {
  position: relative; aspect-ratio: 4 / 3; border-radius: var(--radius); overflow: hidden;
  background: linear-gradient(155deg, color-mix(in srgb, var(--accent) 10%, var(--cream)), var(--cream));
  border: 1px solid var(--border);
}
.preview-3d canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.viewer-status { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; text-align: center; padding: 1rem; font-size: .88rem; color: var(--muted); }
.viewer-hint { font-size: .8rem; color: var(--muted); text-align: center; }
.download-row { display: flex; gap: .7rem; flex-wrap: wrap; }

.privacy-badge { margin-top: 1.6rem; font-size: .84rem; color: var(--muted); text-align: center; }

.section { padding: 3.4rem 0; }
.section-text { max-width: 760px; }
.section-text p { margin-bottom: 1rem; color: var(--ink-soft); }

.steps-grid { list-style: none; display: grid; gap: 1.2rem; grid-template-columns: 1fr; counter-reset: step; }
.step-card { position: relative; padding: 1.4rem 1.4rem 1.4rem 3.6rem; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); }
.step-num {
  position: absolute; left: 1.2rem; top: 1.3rem; width: 1.7rem; height: 1.7rem; border-radius: 50%;
  background: var(--accent); color: #17110c; font-weight: 700; font-size: .85rem;
  display: flex; align-items: center; justify-content: center;
}
.step-card h3 { margin-bottom: .35rem; }
.step-card p { color: var(--ink-soft); font-size: .93rem; }

.use-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
.use-card { padding: 1.3rem; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); }
.use-icon { font-size: 1.6rem; }
.use-card h3 { margin: .6rem 0 .3rem; }
.use-card p { color: var(--ink-soft); font-size: .9rem; }

.faq-list { display: flex; flex-direction: column; gap: .6rem; max-width: 760px; }
.faq-item { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1rem 1.2rem; }
.faq-item summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; font-size: 1.2rem; color: var(--muted); }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { margin-top: .7rem; color: var(--ink-soft); font-size: .93rem; }

.site-footer { border-top: 1px solid var(--border); padding: 1.6rem 0; margin-top: 2rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; font-size: .85rem; color: var(--muted); }
.footer-links { display: flex; gap: 1.2rem; }

/* =============================================================
   7. Effects
   ============================================================= */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease-out), transform .6s var(--ease-out); }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* =============================================================
   8. Responsive
   ============================================================= */
@media (min-width: 720px) {
  .two-col { grid-template-columns: 1fr 1fr; }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .use-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .tool-grid { grid-template-columns: 1.1fr 1fr; align-items: start; }
  .tool-preview { order: 0; }
  .use-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1280px) {
  .hero { padding-top: 2.4rem; }
}

/* =============================================================
   9. Reduced-motion (only intrusive effects)
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { transition-duration: .15s; }
}