/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f7f6f3;
  --bg-alt: #ffffff;
  --ink: #1c1a17;
  --ink-soft: #55504a;
  --line: #e4e0d8;
  --line-strong: #cfc9bd;
  --accent: #d8622f;
  --accent-ink: #ffffff;
  --accent-soft: #fbe6da;
  --ok: #2f7d4f;
  --warn: #b8860b;
  --err: #c23b3b;
  --card: #ffffff;
  --shadow: 0 1px 2px rgba(28,26,23,.04), 0 8px 24px -12px rgba(28,26,23,.12);
  --shadow-lg: 0 20px 60px -20px rgba(28,26,23,.25);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --display: "Fraunces", Georgia, serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --container: 1180px;
}

[data-theme="dark"], :root:not([data-theme="light"]) {
  /* keep light as default identity; site is intentionally single-theme (utility tool) */
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  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; }
input, select, textarea { font: inherit; color: inherit; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.08; letter-spacing: -0.01em; font-family: var(--display); font-weight: 600; }
::selection { background: var(--accent-soft); color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--ink); color: #fff;
  z-index: 9999; border-radius: 8px; font-weight: 600;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   3. Utilities
   ============================================================= */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 1.25rem; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.section { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.section-head { max-width: 62ch; margin-bottom: clamp(1.5rem, 4vw, 2.5rem); }
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); margin-bottom: .5rem; }
.section-head p { color: var(--ink-soft); font-size: 1.05rem; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent); margin-bottom: .6rem;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .85rem 1.4rem; border-radius: 999px; font-weight: 600; font-size: .96rem;
  transition: transform .18s var(--ease-out), box-shadow .18s var(--ease-out), background .18s var(--ease-out);
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 28px -10px rgba(216,98,47,.55); }
.btn-secondary { background: var(--card); color: var(--ink); border: 1px solid var(--line-strong); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: transparent; color: var(--ink-soft); text-decoration: underline; text-underline-offset: 3px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }
.btn-block { width: 100%; }
.btn-lg { padding: 1.05rem 1.6rem; font-size: 1.05rem; }

/* =============================================================
   4. Header
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(247,246,243,.86); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
@supports not (backdrop-filter: blur(1px)) { .site-header { background: var(--bg); } }
.site-header .container { display: flex; align-items: center; justify-content: space-between; padding-block: .85rem; }
.logo { display: flex; align-items: center; gap: .5rem; font-family: var(--display); font-weight: 600; font-size: 1.25rem; }
.logo .logo-mark {
  width: 30px; height: 30px; border-radius: 8px; background: var(--ink); display: grid; place-items: center; flex-shrink: 0;
}
.logo .logo-mark svg { width: 18px; height: 18px; }
.header-nav { display: flex; align-items: center; gap: 1.4rem; }
.header-nav a { font-size: .92rem; font-weight: 500; color: var(--ink-soft); transition: color .15s var(--ease-out); }
.header-nav a:hover { color: var(--accent); }
.header-nav .btn { display: none; }
@media (min-width: 720px) { .header-nav .btn { display: inline-flex; } }

/* =============================================================
   5. Hero
   ============================================================= */
.hero { padding-block: clamp(2rem, 5vw, 3.2rem) 0; }
.hero-head { max-width: 68ch; margin-bottom: clamp(1.4rem, 4vw, 2rem); }
.hero-head h1 {
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  margin-bottom: .7rem;
}
.hero-head h1 em { color: var(--accent); font-style: normal; }
.hero-head p { font-size: clamp(1.02rem, 1.6vw, 1.2rem); color: var(--ink-soft); max-width: 56ch; }
.trust-row {
  display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; margin-top: 1.1rem;
  font-size: .88rem; color: var(--ink-soft);
}
.trust-row span { display: inline-flex; align-items: center; gap: .4rem; }
.trust-row svg { width: 15px; height: 15px; color: var(--ok); flex-shrink: 0; }

/* =============================================================
   6. Tool card
   ============================================================= */
.tool-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden;
}
.tool-grid { display: grid; grid-template-columns: 1fr; }
@media (min-width: 960px) { .tool-grid { grid-template-columns: 1.05fr 1fr; } }

.tool-controls { padding: clamp(1.1rem, 3vw, 1.9rem); border-bottom: 1px solid var(--line); }
@media (min-width: 960px) { .tool-controls { border-bottom: 0; border-right: 1px solid var(--line); } }

.tool-preview {
  padding: clamp(1.1rem, 3vw, 1.9rem);
  background: linear-gradient(180deg, #fbfaf8, #f3f1eb);
  display: flex; flex-direction: column; gap: 1rem;
}

.tabs { display: flex; gap: .4rem; margin-bottom: 1.1rem; background: var(--bg); padding: .3rem; border-radius: 999px; width: fit-content; }
.tab-btn {
  padding: .5rem 1rem; border-radius: 999px; font-size: .88rem; font-weight: 600; color: var(--ink-soft);
  transition: background .15s var(--ease-out), color .15s var(--ease-out);
}
.tab-btn[aria-selected="true"] { background: var(--ink); color: #fff; }
.tab-panel[hidden] { display: none; }

.field { margin-bottom: 1.1rem; }
.field label, .field-label { display: block; font-size: .84rem; font-weight: 600; margin-bottom: .4rem; color: var(--ink); }
.field-hint { font-size: .78rem; color: var(--ink-soft); margin-top: .35rem; }
.input, select.input {
  width: 100%; padding: .75rem .9rem; border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm);
  background: var(--bg-alt); font-size: .95rem; transition: border-color .15s var(--ease-out);
}
.input:focus-visible { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.input-row { display: flex; gap: .6rem; }
.input-row .input { flex: 1; }

.style-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .55rem; }
.style-opt {
  border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm); padding: .55rem .3rem;
  display: flex; flex-direction: column; align-items: center; gap: .35rem; font-size: .74rem; font-weight: 600;
  background: var(--bg-alt); transition: border-color .15s var(--ease-out), background .15s var(--ease-out);
}
.style-opt svg { width: 26px; height: 26px; }
.style-opt[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }

.color-row { display: flex; gap: 1rem; }
.color-field { flex: 1; }
.color-swatch-input {
  display: flex; align-items: center; gap: .6rem; border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm);
  padding: .4rem .6rem; background: var(--bg-alt);
}
.color-swatch-input input[type="color"] {
  width: 34px; height: 34px; border: 0; border-radius: 8px; padding: 0; background: none; cursor: pointer;
}
.color-swatch-input input[type="text"] { border: 0; background: none; width: 100%; font-family: var(--mono); font-size: .85rem; }
.color-swatch-input input[type="text"]:focus-visible { outline: none; }
.swatch-presets { display: flex; gap: .4rem; margin-top: .5rem; }
.swatch-preset {
  width: 22px; height: 22px; border-radius: 50%; border: 2px solid #fff; box-shadow: 0 0 0 1px var(--line-strong);
}

.center-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: .35rem; margin-bottom: .6rem; }
.emoji-opt {
  aspect-ratio: 1; display: grid; place-items: center; font-size: 1.15rem; border-radius: 8px;
  border: 1.5px solid transparent; transition: background .15s var(--ease-out), border-color .15s var(--ease-out);
}
.emoji-opt:hover { background: var(--bg); }
.emoji-opt[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.center-actions { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; }
.upload-btn {
  display: inline-flex; align-items: center; gap: .4rem; font-size: .85rem; font-weight: 600;
  padding: .5rem .85rem; border: 1.5px dashed var(--line-strong); border-radius: var(--radius-sm); color: var(--ink-soft);
}
.upload-btn:hover { border-color: var(--accent); color: var(--accent); }
.center-remove { font-size: .82rem; color: var(--err); font-weight: 600; }
.center-remove[hidden] { display: none; }

/* --- Preview column --- */
.qr-preview-frame {
  background: var(--bg-alt); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem;
  display: grid; place-items: center; min-height: 220px;
}
.qr-preview-frame canvas, .qr-preview-frame svg { max-width: 100%; height: auto; border-radius: 6px; }
.download-row { display: flex; gap: .6rem; flex-wrap: wrap; }

.divider-label {
  display: flex; align-items: center; gap: .7rem; font-size: .78rem; font-weight: 700; letter-spacing: .05em;
  text-transform: uppercase; color: var(--ink-soft); margin-block: .4rem;
}
.divider-label::before, .divider-label::after { content: ""; height: 1px; background: var(--line-strong); flex: 1; }

/* --- 3D panel --- */
.format-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem; }
.format-opt {
  border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm); padding: .7rem .4rem;
  display: flex; flex-direction: column; align-items: center; gap: .4rem; background: var(--bg-alt);
  font-size: .78rem; font-weight: 600; text-align: center;
}
.format-opt svg { width: 34px; height: 34px; }
.format-opt small { font-weight: 500; color: var(--ink-soft); font-size: .7rem; }
.format-opt[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }

.viewer-3d-wrap {
  position: relative; background: #1c1a17; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 4/3; min-height: 260px;
}
.viewer-3d-wrap canvas { width: 100% !important; height: 100% !important; }
.viewer-3d-status {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .6rem; color: #f3f1eb; font-size: .85rem; text-align: center; padding: 1rem; background: #1c1a17;
  transition: opacity .3s var(--ease-out);
}
.viewer-3d-wrap[data-ready="true"] .viewer-3d-status { opacity: 0; pointer-events: none; }
.spinner {
  width: 26px; height: 26px; border-radius: 50%; border: 3px solid rgba(255,255,255,.25); border-top-color: #fff;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.viewer-hint { font-size: .74rem; color: rgba(255,255,255,.6); position: absolute; bottom: .6rem; left: 0; right: 0; text-align: center; }

.warn-panel { display: flex; flex-direction: column; gap: .45rem; }
.warn-item {
  display: flex; align-items: flex-start; gap: .5rem; padding: .55rem .75rem; border-radius: var(--radius-sm);
  font-size: .83rem; background: var(--bg-alt); border: 1px solid var(--line);
}
.warn-item svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: .12rem; }
.warn-item.is-ok { color: var(--ok); }
.warn-item.is-warn { color: var(--warn); border-color: #ecd9a6; background: #fdf7e6; }
.warn-item.is-err { color: var(--err); border-color: #f0c6c6; background: #fdeded; }

.privacy-badge {
  display: flex; align-items: flex-start; gap: .55rem; font-size: .84rem; color: var(--ink-soft);
  background: #eef4ef; border: 1px solid #d3e6d8; padding: .7rem .9rem; border-radius: var(--radius-sm); margin-top: 1rem;
}
.privacy-badge svg { width: 18px; height: 18px; color: var(--ok); flex-shrink: 0; margin-top: .1rem; }

.tool-card[data-3d-state="error"] .viewer-3d-status[data-for="error"] { display: flex; }
.viewer-3d-status[data-for="error"] { display: none; }

/* =============================================================
   7. Ad slots (placeholders only)
   ============================================================= */
.ad-slot {
  border: 1.5px dashed var(--line-strong); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; color: var(--ink-soft);
  font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  background: repeating-linear-gradient(135deg, #fff, #fff 10px, #f4f2ec 10px, #f4f2ec 20px);
}
.ad-slot span { background: var(--bg-alt); padding: .3rem .8rem; border-radius: 999px; border: 1px solid var(--line-strong); }
.ad-banner { min-height: 100px; margin-block: clamp(1.5rem, 4vw, 2.5rem); }
.ad-incontent { min-height: 250px; max-width: 560px; margin-inline: auto; margin-block: clamp(1.5rem, 4vw, 2.5rem); }

.ad-toast {
  position: fixed; bottom: 1rem; right: 1rem; z-index: 60; width: 220px; min-height: 90px;
  box-shadow: var(--shadow-lg); background: var(--card); transform: translateY(20px); opacity: 0;
  pointer-events: none; transition: transform .3s var(--ease-out), opacity .3s var(--ease-out);
}
.ad-toast.is-visible { transform: translateY(0); opacity: 1; pointer-events: auto; }
.ad-toast-close {
  position: absolute; top: .3rem; right: .3rem; width: 22px; height: 22px; border-radius: 50%;
  background: var(--bg); display: grid; place-items: center; font-size: .8rem; color: var(--ink-soft);
}
.ad-toast-close:hover { background: var(--line); color: var(--ink); }

dialog.ad-dialog {
  border: 0; border-radius: var(--radius-lg); padding: 0; max-width: 380px; width: calc(100% - 2.5rem);
  box-shadow: var(--shadow-lg);
}
dialog.ad-dialog::backdrop { background: rgba(28,26,23,.55); backdrop-filter: blur(2px); }
.ad-dialog-inner { padding: 1.3rem; display: flex; flex-direction: column; gap: .8rem; }
.ad-dialog-head { display: flex; align-items: center; justify-content: space-between; }
.ad-dialog-head strong { font-size: .95rem; }
.ad-dialog-close {
  width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--bg);
  font-size: 1rem; color: var(--ink-soft);
}
.ad-dialog-close:hover { background: var(--line); color: var(--ink); }
.ad-dialog .ad-slot { min-height: 220px; }
.ad-dialog-foot { text-align: center; }

/* =============================================================
   8. How it works / use cases / FAQ
   ============================================================= */
.steps-grid { display: grid; gap: 1.4rem; grid-template-columns: 1fr; counter-reset: step; }
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(3, 1fr); } }
.step-card { position: relative; padding-top: .5rem; }
.step-num {
  width: 40px; height: 40px; border-radius: 50%; background: var(--ink); color: #fff; font-family: var(--display);
  font-weight: 600; display: grid; place-items: center; margin-bottom: .9rem; font-size: 1.05rem;
}
.step-card h3 { font-size: 1.1rem; margin-bottom: .4rem; }
.step-card p { color: var(--ink-soft); font-size: .94rem; }

.usecase-grid { display: grid; gap: 1.1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .usecase-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .usecase-grid { grid-template-columns: repeat(3, 1fr); } }
.usecase-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem;
  transition: border-color .18s var(--ease-out), transform .18s var(--ease-out);
}
.usecase-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.usecase-emoji { font-size: 1.7rem; margin-bottom: .6rem; }
.usecase-card h3 { font-size: 1.02rem; margin-bottom: .35rem; }
.usecase-card p { color: var(--ink-soft); font-size: .9rem; }

.seo-copy { max-width: 74ch; color: var(--ink-soft); font-size: 1rem; }
.seo-copy p { margin-bottom: 1rem; }
.seo-copy h2, .seo-copy h3 { color: var(--ink); margin-top: 1.6rem; margin-bottom: .5rem; }
.seo-copy h2 { font-size: 1.5rem; }
.seo-copy h3 { font-size: 1.15rem; font-family: var(--sans); font-weight: 700; }

.faq-list { display: flex; flex-direction: column; gap: .7rem; max-width: 78ch; }
.faq-item {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .2rem .3rem;
}
.faq-item summary {
  cursor: pointer; list-style: none; padding: .9rem 1rem; font-weight: 600; font-size: .98rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.3rem; color: var(--accent); flex-shrink: 0; font-weight: 400; }
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p { padding: 0 1rem 1rem; color: var(--ink-soft); font-size: .93rem; }

/* =============================================================
   9. Footer
   ============================================================= */
.site-footer { border-top: 1px solid var(--line); padding-block: 2rem; margin-top: 2rem; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; justify-content: space-between; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem 1.4rem; font-size: .85rem; color: var(--ink-soft); }
.footer-links a:hover { color: var(--accent); }
.footer-note { font-size: .82rem; color: var(--ink-soft); margin-top: 1rem; max-width: 70ch; }

.legal-page { padding-block: 3rem; max-width: 74ch; }
.legal-page h1 { margin-bottom: 1rem; }
.legal-page h2 { font-size: 1.2rem; margin-top: 1.6rem; margin-bottom: .5rem; }
.legal-page p, .legal-page li { color: var(--ink-soft); margin-bottom: .8rem; }
.legal-page ul { padding-left: 1.2rem; }

.js-required-note { display: none; padding: 1rem; text-align: center; color: var(--ink-soft); font-size: .9rem; }
.no-js .js-required-note { display: block; }
.no-js .tool-controls, .no-js .tool-preview { opacity: .45; pointer-events: none; }

/* =============================================================
   10. Responsive tweaks
   ============================================================= */
@media (max-width: 539px) {
  .style-grid { grid-template-columns: repeat(4, 1fr); }
  .color-row { flex-direction: column; }
  .center-grid { grid-template-columns: repeat(6, 1fr); }
  .format-grid { grid-template-columns: 1fr; }
}