/* ============================================================
   QR3D Print — styles.css
   Sections: 1 reset  2 variables  3 layout shell  4 hero
   5 tool card  6 form controls  7 preview 2d  8 viewer 3d
   9 print warnings  10 buttons  11 ad slots  12 content sections
   13 faq  14 footer  15 dialog + toast  16 responsive  17 motion
   ============================================================ */

/* 1. Reset ---------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
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 { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
input, select { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; letter-spacing: -0.01em; font-family: var(--display); }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

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

/* 2. Variables -------------------------------------------------- */
:root {
  --sans: "Inter", system-ui, sans-serif;
  --display: "Manrope", var(--sans);

  --bg: #F6F5F1;
  --card: #FFFFFF;
  --ink: #17181C;
  --ink-soft: #565A64;
  --line: #E4E2DA;
  --cream: #F2F1EC;
  --accent: #D65F3B;
  --accent-ink: #FFFFFF;
  --accent-soft: #FBE7DE;
  --ok: #2E7D4F;
  --warn: #B8842A;
  --err: #C9432C;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --container: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151A;
    --card: #1D1E24;
    --ink: #F1F0EC;
    --ink-soft: #A2A5B0;
    --line: #2C2E36;
    --cream: #23242B;
    --accent: #ED7A52;
    --accent-ink: #17181C;
    --accent-soft: #3A2A22;
  }
}

/* 3. Layout shell ------------------------------------------------ */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--container); margin: 0 auto;
  padding: 1.1rem 1.25rem;
}
.brand { display: flex; align-items: center; gap: .5rem; font-family: var(--display); font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.brand svg { color: var(--accent); }
.brand b { font-weight: 800; }
.site-nav { display: none; gap: 1.5rem; font-size: .92rem; font-weight: 500; color: var(--ink-soft); }
.site-nav a:hover { color: var(--ink); }
@media (min-width: 720px) { .site-nav { display: flex; } }

main { max-width: var(--container); margin: 0 auto; padding: 0 1.25rem; }

/* 4. Hero --------------------------------------------------------- */
.hero { max-width: 720px; margin: .5rem auto 1.75rem; text-align: center; }
.hero h1 { font-size: clamp(1.7rem, 4.4vw, 2.6rem); font-weight: 800; }
.hero-sub { margin-top: .85rem; color: var(--ink-soft); font-size: clamp(1rem, 1.6vw, 1.15rem); }

/* 5. Tool card ------------------------------------------------------ */
.tool-section { margin-bottom: 2.5rem; }
.tool-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 1.5rem; max-width: 640px; margin: 0 auto;
  box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 12px 32px -18px rgba(0,0,0,.18);
}
.tool-step { padding: 1.15rem 0; border-bottom: 1px solid var(--line); }
.tool-step:first-child { padding-top: 0; }
.tool-divider { border: 0; border-top: 1px solid var(--line); margin: 0; }
.step-label { display: block; font-family: var(--display); font-weight: 700; font-size: .8rem; letter-spacing: .02em; text-transform: uppercase; color: var(--accent); margin-bottom: .85rem; }
.sub-label { display: block; font-size: .85rem; font-weight: 600; color: var(--ink-soft); margin: .9rem 0 .5rem; }
.field-label { display: block; font-size: .85rem; font-weight: 500; color: var(--ink-soft); margin-bottom: .4rem; }
.field-row { display: grid; gap: .85rem; grid-template-columns: 1fr; margin-bottom: .85rem; }
@media (min-width: 540px) { .field-row { grid-template-columns: 1fr 1fr; } }

/* 6. Form controls ----------------------------------------------- */
.text-input {
  width: 100%; padding: .7rem .85rem; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg); font-size: .95rem; transition: border-color .15s var(--ease-out);
}
.text-input:focus { border-color: var(--accent); outline: none; }
.select-input { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%), linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%); background-position: calc(100% - 18px) center, calc(100% - 13px) center; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 2rem; }

.mode-tabs { display: flex; gap: .5rem; margin-bottom: 1.1rem; }
.mode-tab { flex: 1; padding: .6rem .5rem; border-radius: var(--radius-sm); border: 1.5px solid var(--line); font-weight: 600; font-size: .9rem; text-align: center; transition: all .15s var(--ease-out); }
.mode-tab.is-active { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.mode-panel { display: none; }
.mode-panel.is-active { display: block; }

.style-grid, .format-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; margin-bottom: 1.1rem; }
.format-grid { grid-template-columns: 1fr; }
@media (min-width: 480px) { .format-grid { grid-template-columns: repeat(3, 1fr); } }
.style-btn, .format-btn {
  padding: .65rem .5rem; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  font-size: .85rem; font-weight: 600; text-align: center; transition: all .15s var(--ease-out);
  display: flex; align-items: center; justify-content: center; gap: .4rem;
}
.format-ico { font-size: 1rem; opacity: .7; }
.style-btn.is-active, .format-btn.is-active { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.style-btn:hover, .format-btn:hover { border-color: var(--accent); }

.color-row { display: flex; gap: 1.25rem; margin-bottom: .5rem; flex-wrap: wrap; }
.color-field { display: flex; align-items: center; gap: .6rem; font-size: .85rem; font-weight: 500; color: var(--ink-soft); }
.color-field input[type="color"] {
  width: 38px; height: 38px; padding: 0; border: 1.5px solid var(--line); border-radius: 50%;
  overflow: hidden; cursor: pointer; background: none;
}
.color-field input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-field input[type="color"]::-webkit-color-swatch { border: 0; border-radius: 50%; }

.center-row { display: flex; align-items: center; gap: .9rem; flex-wrap: wrap; }
.emoji-grid { display: flex; flex-wrap: wrap; gap: .4rem; }
.emoji-btn {
  width: 38px; height: 38px; border-radius: 50%; border: 1.5px solid var(--line); font-size: 1.05rem;
  display: flex; align-items: center; justify-content: center; transition: all .15s var(--ease-out);
}
.emoji-btn.is-active { border-color: var(--accent); background: var(--accent-soft); }
.upload-btn {
  padding: .55rem .9rem; border: 1.5px dashed var(--line); border-radius: var(--radius-sm);
  font-size: .85rem; font-weight: 600; color: var(--ink-soft); white-space: nowrap; cursor: pointer;
}
.upload-btn:hover { border-color: var(--accent); color: var(--accent); }

/* 7. Preview 2D --------------------------------------------------- */
.preview-step { text-align: center; }
.preview-2d {
  display: flex; align-items: center; justify-content: center; margin: 0 auto .9rem;
  width: min(220px, 60vw); aspect-ratio: 1; background: var(--bg); border-radius: var(--radius);
  border: 1px solid var(--line); overflow: hidden;
}
.preview-2d canvas, .preview-2d svg { width: 100% !important; height: 100% !important; }
.btn-row { display: flex; gap: .6rem; justify-content: center; flex-wrap: wrap; }

/* 8. Viewer 3D ------------------------------------------------------ */
.viewer-wrap { margin: .3rem 0 1rem; }
.viewer-3d {
  position: relative; width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg), var(--cream)); border: 1px solid var(--line);
  overflow: hidden; touch-action: none; cursor: grab;
}
.viewer-3d:active { cursor: grabbing; }
.viewer-3d canvas { position: absolute; inset: 0; width: 100% !important; height: 100% !important; }
.viewer-fallback {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  padding: 1rem; text-align: center; font-size: .85rem; color: var(--ink-soft);
}
.viewer-3d[data-state="ready"] .viewer-fallback { display: none; }
.viewer-hint { text-align: center; font-size: .78rem; color: var(--ink-soft); margin-top: .5rem; }

/* 9. Print warnings ----------------------------------------------- */
.print-warnings { display: flex; flex-direction: column; gap: .4rem; margin-bottom: 1rem; }
.print-warnings:empty { display: none; margin: 0; }
.warn-line { display: flex; align-items: flex-start; gap: .5rem; font-size: .82rem; padding: .55rem .7rem; border-radius: var(--radius-sm); }
.warn-line.is-ok { background: color-mix(in srgb, var(--ok) 12%, transparent); color: var(--ok); }
.warn-line.is-warn { background: color-mix(in srgb, var(--warn) 14%, transparent); color: var(--warn); }
.warn-line.is-err { background: color-mix(in srgb, var(--err) 14%, transparent); color: var(--err); }

/* 10. Buttons -------------------------------------------------------- */
.btn { padding: .75rem 1.3rem; border-radius: 999px; font-weight: 700; font-size: .92rem; transition: transform .15s var(--ease-out), opacity .15s var(--ease-out); }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--accent); color: var(--accent-ink); width: 100%; text-align: center; }
.btn-secondary { background: var(--cream); color: var(--ink); border: 1.5px solid var(--line); }
.link-btn { display: block; width: 100%; text-align: center; margin-top: .7rem; font-size: .82rem; font-weight: 600; color: var(--ink-soft); text-decoration: underline; text-underline-offset: 3px; }
.link-btn:hover { color: var(--accent); }

.privacy-badge { margin-top: 1.1rem; font-size: .82rem; color: var(--ink-soft); text-align: center; }
.tool-limits { margin-top: .3rem; font-size: .76rem; color: var(--ink-soft); opacity: .8; text-align: center; }

/* 11. Ad slots ---------------------------------------------------------- */
.ad-slot {
  max-width: var(--container); margin: 1.75rem auto; padding: 1.1rem;
  border: 1.5px dashed var(--line); border-radius: var(--radius); min-height: 90px;
  display: flex; align-items: center; justify-content: center; color: var(--ink-soft);
}
.ad-slot--leaderboard { min-height: 90px; }
.ad-slot--incontent { min-height: 250px; margin-left: 1.25rem; margin-right: 1.25rem; }
.ad-slot--popup { min-height: 160px; margin: .9rem 0; }
.ad-label { font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; opacity: .55; }
@media (min-width: 1120px) { .ad-slot--leaderboard, .ad-slot--incontent { margin-left: auto; margin-right: auto; } }

/* 12. Content sections ------------------------------------------------- */
.content-section { max-width: 760px; margin: 0 auto 3rem; }
.content-section h2 { font-size: clamp(1.35rem, 3vw, 1.75rem); margin-bottom: 1.1rem; }
.seo-text p { color: var(--ink-soft); margin-bottom: 1rem; }
.seo-text p:last-child { margin-bottom: 0; }

.steps-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(3, 1fr); } }
.step-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 800; font-size: .85rem; margin-bottom: .7rem; }
.step-card h3 { font-size: 1rem; margin-bottom: .4rem; }
.step-card p { font-size: .88rem; color: var(--ink-soft); }

.uso-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 540px) { .uso-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .uso-grid { grid-template-columns: repeat(3, 1fr); } }
.uso-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; }
.uso-emoji { font-size: 1.6rem; display: block; margin-bottom: .6rem; }
.uso-card h3 { font-size: .98rem; margin-bottom: .35rem; }
.uso-card p { font-size: .86rem; color: var(--ink-soft); }

/* 13. FAQ ----------------------------------------------------------------- */
.faq-list { display: flex; flex-direction: column; gap: .6rem; }
.faq-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: .2rem 1.1rem; }
.faq-item summary { padding: .95rem 0; font-weight: 600; font-size: .95rem; cursor: pointer; list-style: none; position: relative; padding-right: 1.6rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 0; top: .8rem; font-size: 1.2rem; color: var(--accent); transition: transform .2s var(--ease-out); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding-bottom: 1rem; font-size: .9rem; color: var(--ink-soft); }

/* 14. Footer ---------------------------------------------------------------- */
.site-footer {
  max-width: var(--container); margin: 0 auto; padding: 2rem 1.25rem 3rem;
  display: flex; flex-direction: column; gap: .7rem; align-items: center; text-align: center;
  font-size: .82rem; color: var(--ink-soft); border-top: 1px solid var(--line); margin-top: 1rem;
}
.site-footer nav { display: flex; gap: 1.2rem; }
.site-footer a:hover { color: var(--accent); }

/* 15. Dialog + toast --------------------------------------------------------- */
.download-dialog {
  border: none; border-radius: var(--radius-lg); padding: 1.4rem; max-width: 380px; width: calc(100% - 2.5rem);
  background: var(--card); color: var(--ink); box-shadow: 0 24px 60px -20px rgba(0,0,0,.35);
}
.download-dialog::backdrop { background: rgba(10,10,12,.55); backdrop-filter: blur(2px); }
.dialog-close { position: absolute; top: .8rem; right: .9rem; width: 30px; height: 30px; border-radius: 50%; font-size: .95rem; color: var(--ink-soft); }
.dialog-close:hover { background: var(--cream); }
.dialog-kicker { font-weight: 700; margin-bottom: .2rem; padding-right: 1.6rem; }
.dialog-continue { display: block; width: 100%; text-align: center; margin-top: .3rem; }

.corner-toast {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 500; width: 240px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: .9rem; box-shadow: 0 16px 40px -18px rgba(0,0,0,.3);
  animation: toast-in .35s var(--ease-out);
}
.corner-toast[hidden] { display: none; }
.toast-close { position: absolute; top: .5rem; right: .6rem; width: 22px; height: 22px; font-size: .78rem; color: var(--ink-soft); }
@keyframes toast-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 480px) { .corner-toast { left: 1rem; right: 1rem; width: auto; } }

/* 16. Responsive base tweaks -------------------------------------------------- */
@media (min-width: 720px) {
  .tool-card { padding: 2rem; }
}

/* 17. Reduced motion ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .corner-toast { animation: none; }
  .btn:hover { transform: none; }
}