/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --ink: #1b1b22;
  --ink-soft: #55535f;
  --border: #e4e1d8;
  --accent: #d6552c;
  --accent-ink: #ffffff;
  --ok: #1f8a4c;
  --warn: #b8860b;
  --danger: #c23b3b;
  --radius: 14px;
  --radius-sm: 9px;
  --sans: "Manrope", system-ui, -apple-system, sans-serif;
  --display: "Sora", var(--sans);
  --shadow-card: 0 1px 2px rgba(20,18,14,.04), 0 8px 24px -12px rgba(20,18,14,.14);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15141a;
    --surface: #1e1d24;
    --ink: #f1efe8;
    --ink-soft: #b3b0bd;
    --border: #33323c;
    --shadow-card: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px -12px rgba(0,0,0,.5);
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
[hidden] { display: none !important; }
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;
  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; }
a { color: inherit; text-decoration: none; }
input[type="text"], input[type="password"] { font: inherit; color: inherit; }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; line-height: 1.12; letter-spacing: -0.01em; }
p { text-wrap: pretty; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* =============================================================
   3. Utilities
   ============================================================= */
.container { width: 100%; max-width: 900px; margin-inline: auto; padding-inline: 1.25rem; }
.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--ink); color: var(--bg);
  z-index: 9999; border-radius: 8px; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   4. Header / footer
   ============================================================= */
.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding-block: .9rem; }
.logo { display: flex; align-items: center; gap: .5rem; font-family: var(--display); font-weight: 700; color: var(--ink); }
.header-badge { font-size: .78rem; color: var(--ink-soft); background: var(--bg); border: 1px solid var(--border); padding: .3rem .7rem; border-radius: 999px; }

.site-footer { border-top: 1px solid var(--border); margin-top: 3rem; padding-block: 1.8rem; color: var(--ink-soft); font-size: .9rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: .8rem 1.5rem; align-items: center; justify-content: space-between; }
.footer-nav { display: flex; gap: 1.1rem; }
.footer-nav a:hover { color: var(--accent); }

/* =============================================================
   5. Hero
   ============================================================= */
.hero { padding-block: 2.2rem 1.4rem; text-align: center; }
.hero h1 { font-size: clamp(1.7rem, 4.4vw, 2.6rem); max-width: 22ch; margin-inline: auto; }
.hero-sub { color: var(--ink-soft); max-width: 52ch; margin: .9rem auto 0; font-size: 1.02rem; }

/* =============================================================
   6. Tool card
   ============================================================= */
.tool-section { padding-block: .5rem 1.5rem; }
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}
.tool-block { display: flex; flex-direction: column; gap: .9rem; }
.tool-block-title { font-size: 1.05rem; font-weight: 700; }
.tool-block-3d { border-top: 1px dashed var(--border); padding-top: 1.6rem; }

.field { display: flex; flex-direction: column; gap: .35rem; font-size: .85rem; font-weight: 600; color: var(--ink-soft); }
.field > input[type="text"] {
  font-weight: 500; font-size: 1rem; color: var(--ink);
  padding: .7rem .85rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg);
}
.field > input[type="text"]:focus { border-color: var(--accent); }
.field-error,
.field-warning {
  margin-top: .65rem;
  padding: .7rem .85rem;
  border-radius: var(--radius-sm);
  font-size: .86rem;
  line-height: 1.45;
}
.field-error { color: #8a281e; background: #fff0ed; border: 1px solid #f0b4aa; }
.field-warning { color: #6f4d00; background: #fff8df; border: 1px solid #ead58a; }
.btn:disabled { opacity: .48; cursor: not-allowed; transform: none; }
.field-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.field-row .field { flex: 1 1 180px; }
.field-color input[type="color"] { width: 100%; height: 42px; padding: 0; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); }

.mode-tabs { display: flex; gap: .5rem; }
.mode-tab {
  padding: .5rem 1rem; border-radius: 999px; border: 1px solid var(--border);
  font-weight: 600; font-size: .88rem; color: var(--ink-soft); background: var(--bg);
  transition: background .2s var(--ease-out), color .2s var(--ease-out), border-color .2s var(--ease-out);
}
.mode-tab.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.style-grid, .format-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: .6rem; }
.style-opt, .format-opt {
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  padding: .7rem .5rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg); font-size: .82rem; font-weight: 600; text-align: center;
  transition: border-color .18s var(--ease-out), background .18s var(--ease-out);
}
.style-opt:hover, .format-opt:hover { border-color: var(--ink-soft); }
.style-opt.is-active, .format-opt.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--bg)); }
.format-opt small { font-weight: 500; color: var(--ink-soft); }

.center-row { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.emoji-grid { display: flex; gap: .3rem; flex-wrap: wrap; }
.emoji-opt {
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: var(--bg);
}
.emoji-opt.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--bg)); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .75rem 1.2rem; border-radius: 999px; font-weight: 700; font-size: .92rem;
  transition: transform .15s var(--ease-out), background .18s var(--ease-out), opacity .18s var(--ease-out);
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 88%, black); }
.btn-secondary { background: var(--ink); color: var(--bg); }
.btn-secondary:hover { background: color-mix(in srgb, var(--ink) 85%, white); }
.btn-ghost { background: var(--bg); border: 1px solid var(--border); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink-soft); }
.btn-small { padding: .55rem .9rem; font-size: .82rem; }
.btn-big { padding: .95rem 1.4rem; font-size: 1rem; width: 100%; }
.file-btn { position: relative; }

.preview-2d-row { display: flex; gap: 1.2rem; flex-wrap: wrap; align-items: flex-start; }
.qr-preview {
  width: 220px; height: 220px; flex-shrink: 0; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: #fff; display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.qr-preview canvas, .qr-preview svg { max-width: 100%; max-height: 100%; }
.preview-2d-actions { display: flex; flex-direction: column; gap: .6rem; flex: 1 1 160px; justify-content: center; }

.print-warnings { display: flex; flex-direction: column; gap: .4rem; }
.print-warning { font-size: .84rem; padding: .55rem .8rem; border-radius: var(--radius-sm); font-weight: 600; }
.print-warning.ok { background: color-mix(in srgb, var(--ok) 12%, var(--bg)); color: var(--ok); }
.print-warning.warn { background: color-mix(in srgb, var(--warn) 14%, var(--bg)); color: var(--warn); }
.print-warning.danger { background: color-mix(in srgb, var(--danger) 12%, var(--bg)); color: var(--danger); }

.viewer-row { display: flex; gap: 1.2rem; flex-wrap: wrap; align-items: flex-start; }
.viewer-3d {
  width: 100%; max-width: 340px; aspect-ratio: 1 / 1; flex-shrink: 0;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: linear-gradient(180deg, #f0efe9, #e7e5da);
  position: relative; overflow: hidden; touch-action: none;
}
@media (prefers-color-scheme: dark) { .viewer-3d { background: linear-gradient(180deg, #26252d, #1c1b22); } }
.viewer-3d canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.viewer-3d-placeholder { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; text-align: center; padding: 1rem; color: var(--ink-soft); font-size: .88rem; }
.viewer-3d-actions { display: flex; flex-direction: column; gap: .6rem; flex: 1 1 200px; }
.viewer-3d-hint { font-size: .8rem; color: var(--ink-soft); }

.privacy-badge { font-size: .85rem; color: var(--ink-soft); }
.tool-limits { font-size: .78rem; color: var(--ink-soft); }

/* =============================================================
   7. Ad slots
   ============================================================= */
.ad-slot {
  display: flex; align-items: center; justify-content: center;
  border: 1px dashed var(--border); border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--ink) 3%, var(--bg));
  color: var(--ink-soft); font-size: .72rem; letter-spacing: .12em; font-weight: 700;
  text-transform: uppercase;
}
.ad-slot--banner { min-height: 90px; margin-block: 1.5rem; }
.ad-slot--incontent { min-height: 250px; margin-block: 1.8rem; }
.ad-slot--dialog { min-height: 200px; width: 100%; border-radius: var(--radius-sm); }
.ad-slot--corner { width: 260px; height: 90px; }

.ad-dialog {
  border: none; border-radius: var(--radius); padding: 1.2rem; max-width: 360px; width: calc(100% - 2rem);
  box-shadow: var(--shadow-card); background: var(--surface); color: var(--ink);
}
.ad-dialog::backdrop { background: rgba(15,14,10,.5); }
.ad-dialog-close {
  position: absolute; top: .6rem; right: .7rem; width: 30px; height: 30px; border-radius: 50%;
  font-size: 1.2rem; line-height: 1; background: var(--bg); border: 1px solid var(--border);
}
.ad-dialog-caption { margin-top: .8rem; font-size: .85rem; color: var(--ink-soft); text-align: center; }

.corner-toast {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 500;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card); padding: .7rem;
}
.corner-toast-close {
  position: absolute; top: -10px; right: -10px; width: 26px; height: 26px; border-radius: 50%;
  background: var(--ink); color: var(--bg); font-size: 1rem; display: flex; align-items: center; justify-content: center;
}

/* =============================================================
   8. Content sections
   ============================================================= */
.how-it-works, .seo-text, .use-ideas, .faq { padding-block: 2rem; }
.how-it-works h2, .use-ideas h2, .faq h2, .seo-text h2 { font-size: clamp(1.3rem, 3vw, 1.7rem); margin-bottom: 1.1rem; }
.seo-text p { color: var(--ink-soft); margin-top: .9rem; max-width: 68ch; }

.steps-grid, .ideas-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.step-card, .idea-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1.1rem; display: flex; flex-direction: column; gap: .4rem;
}
.step-card h3, .idea-card h3 { font-size: 1rem; }
.step-card p, .idea-card p { font-size: .88rem; color: var(--ink-soft); }

.faq details {
  border-bottom: 1px solid var(--border); padding-block: .9rem;
}
.faq summary { font-weight: 700; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.2rem; color: var(--accent); flex-shrink: 0; }
.faq details[open] summary::after { content: "–"; }
.faq p { color: var(--ink-soft); margin-top: .6rem; font-size: .92rem; }

/* =============================================================
   9. Responsive
   ============================================================= */
@media (min-width: 540px) {
  .tool-card { padding: 1.9rem; }
}
@media (min-width: 720px) {
  .preview-2d-row, .viewer-row { flex-wrap: nowrap; }
}
@media (min-width: 960px) {
  .container { padding-inline: 0; }
}