/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #faf9f7;
  --surface: #ffffff;
  --surface-alt: #f2f1ec;
  --ink: #17181c;
  --ink-soft: #52545c;
  --border: #e4e2da;
  --accent: #4338ca;
  --accent-2: #7c3aed;
  --accent-soft: #eeecfd;
  --ok: #0d9488;
  --warn: #b45309;
  --warn-bg: #fef3c7;
  --danger: #b91c1c;
  --danger-bg: #fee2e2;
  --cream: #faf7f0;
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(23, 24, 28, .06);
  --shadow: 0 8px 24px rgba(23, 24, 28, .08);
  --shadow-lg: 0 20px 48px rgba(23, 24, 28, .14);
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Sora", var(--sans);
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121218;
    --surface: #1a1b22;
    --surface-alt: #21222b;
    --ink: #f3f2ef;
    --ink-soft: #a8a9b3;
    --border: #33343e;
    --accent: #8b7cf6;
    --accent-2: #a78bfa;
    --accent-soft: #26243d;
    --cream: #1a1b22;
    --warn-bg: #3a2c0c;
    --danger-bg: #3a1414;
  }
}

/* =============================================================
   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); }
::selection { background: var(--accent-soft); color: var(--accent); }
: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: var(--bg);
  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: 1120px; 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;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent);
}
.badge {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .4rem .75rem; border-radius: 999px;
  background: var(--surface-alt); border: 1px solid var(--border);
  font-size: .83rem; color: var(--ink-soft);
}
.section { padding-block: clamp(3rem, 7vw, 5.5rem); }
.section-head { max-width: 640px; margin-bottom: 2.25rem; }
.section-head p { color: var(--ink-soft); margin-top: .6rem; font-size: 1.05rem; }

/* =============================================================
   4. Header / footer
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .9rem 1.25rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { font-family: var(--display); font-weight: 800; font-size: 1.2rem; color: var(--ink); }
.brand span { color: var(--accent); }
.header-nav { display: flex; align-items: center; gap: 1.2rem; font-size: .92rem; color: var(--ink-soft); }
.header-nav a:hover { color: var(--accent); }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.25rem 3rem;
  color: var(--ink-soft); font-size: .88rem;
}
.footer-inner {
  max-width: 1120px; margin-inline: auto;
  display: flex; flex-wrap: wrap; gap: 1rem 1.6rem; align-items: center; justify-content: space-between;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 1.1rem; }
.footer-links a:hover { color: var(--accent); }
.footer-credits { width: 100%; margin-top: 1rem; font-size: .8rem; opacity: .8; }

/* =============================================================
   5. Hero + tool card
   ============================================================= */
.hero { padding-block: clamp(2rem, 5vw, 3.25rem) 1.5rem; }
.hero-head { max-width: 760px; margin-inline: auto; text-align: center; }
.hero-head h1 { font-size: clamp(1.9rem, 4.4vw, 2.9rem); }
.hero-head .lead { margin-top: .85rem; font-size: 1.12rem; color: var(--ink-soft); max-width: 56ch; margin-inline: auto; }

.tool-shell { margin-top: 2.25rem; }
.tool-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  padding: clamp(1.1rem, 3vw, 1.9rem);
}
.tool-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.75rem;
}
@media (min-width: 960px) {
  .tool-grid { grid-template-columns: minmax(0,1fr) minmax(0,1fr); align-items: start; }
}

.tool-col-controls { display: flex; flex-direction: column; gap: 1.25rem; }
.field-group { display: flex; flex-direction: column; gap: .45rem; }
.field-label {
  font-size: .82rem; font-weight: 700; color: var(--ink-soft);
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
}
.field-label .hint { font-weight: 500; font-size: .76rem; color: var(--ink-soft); opacity: .8; }

.input, .select, textarea.input {
  width: 100%; padding: .68rem .85rem; border-radius: var(--radius-sm);
  border: 1.5px solid var(--border); background: var(--surface);
  font-size: .96rem; transition: border-color .15s var(--ease-out);
}
.input:focus, .select:focus, textarea.input:focus { border-color: var(--accent); }

.seg {
  display: inline-flex; padding: .25rem; gap: .25rem;
  background: var(--surface-alt); border-radius: 999px; border: 1px solid var(--border);
}
.seg button {
  padding: .48rem 1rem; border-radius: 999px; font-size: .87rem; font-weight: 600;
  color: var(--ink-soft); transition: background .15s var(--ease-out), color .15s var(--ease-out);
}
.seg button.is-active { background: var(--ink); color: var(--bg); }

.style-grid, .format-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem;
}
.format-grid { grid-template-columns: repeat(3, 1fr); }
.pick-card {
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  padding: .7rem .5rem; border-radius: var(--radius-sm);
  border: 1.5px solid var(--border); background: var(--surface);
  font-size: .82rem; font-weight: 600; text-align: center;
  transition: border-color .15s var(--ease-out), background .15s var(--ease-out);
}
.pick-card svg { width: 28px; height: 28px; color: var(--ink-soft); }
.pick-card.is-active { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.pick-card.is-active svg { color: var(--accent); }
.pick-card:hover { border-color: var(--accent); }

.color-row { display: flex; gap: .85rem; }
.color-field { flex: 1; display: flex; align-items: center; gap: .6rem; padding: .5rem .65rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm); }
.color-field input[type="color"] {
  width: 34px; height: 34px; padding: 0; border: 0; border-radius: 8px; background: none;
  cursor: pointer;
}
.color-field input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-field input[type="color"]::-webkit-color-swatch { border: 1px solid var(--border); border-radius: 8px; }
.color-field span { font-size: .82rem; font-weight: 600; color: var(--ink-soft); }
.color-field code { margin-left: auto; font-family: var(--mono); font-size: .78rem; color: var(--ink-soft); }

.center-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.emoji-grid { display: flex; flex-wrap: wrap; gap: .4rem; }
.emoji-btn {
  width: 40px; height: 40px; font-size: 1.25rem;
  border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: var(--surface);
  display: flex; align-items: center; justify-content: center;
}
.emoji-btn.is-active { border-color: var(--accent); background: var(--accent-soft); }
.upload-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .55rem .9rem; border-radius: var(--radius-sm);
  border: 1.5px dashed var(--border); font-size: .84rem; font-weight: 600; color: var(--ink-soft);
}
.upload-btn:hover { border-color: var(--accent); color: var(--accent); }
.remove-center {
  font-size: .8rem; font-weight: 600; color: var(--danger); padding: .3rem .5rem;
}

/* Preview column */
.tool-col-preview { display: flex; flex-direction: column; gap: 1rem; }
.preview-tabs { display: flex; gap: .4rem; }
.preview-panes { position: relative; }
.preview-pane { display: none; }
.preview-pane.is-active { display: block; }

.preview-2d {
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-alt); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; min-height: 280px;
}
.preview-2d canvas, .preview-2d img { max-width: 100%; border-radius: 6px; }

.preview-3d-wrap {
  position: relative; background: var(--surface-alt); border: 1px solid var(--border);
  border-radius: var(--radius); min-height: 320px; overflow: hidden;
}
.preview-3d-wrap canvas { width: 100%; height: 100%; display: block; }
.preview-3d-status {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .5rem; color: var(--ink-soft); font-size: .88rem; text-align: center; padding: 1rem;
}
.preview-3d-wrap[data-ready="1"] .preview-3d-status { display: none; }
.preview-3d-hint {
  position: absolute; left: .75rem; bottom: .75rem;
  font-size: .74rem; color: var(--ink-soft); background: color-mix(in srgb, var(--surface) 80%, transparent);
  padding: .3rem .6rem; border-radius: 999px; border: 1px solid var(--border);
}
.spinner {
  width: 26px; height: 26px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.warnings { display: flex; flex-direction: column; gap: .5rem; }
.warning-line {
  display: flex; gap: .55rem; align-items: flex-start;
  padding: .6rem .75rem; border-radius: var(--radius-sm);
  font-size: .85rem; border: 1px solid var(--border); background: var(--surface-alt); color: var(--ink-soft);
}
.warning-line.is-bad { background: var(--danger-bg); color: var(--danger); border-color: transparent; }
.warning-line.is-warn { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
.warning-line.is-ok { background: color-mix(in srgb, var(--ok) 12%, transparent); color: var(--ok); border-color: transparent; }
.warning-line svg { width: 16px; height: 16px; flex: none; margin-top: .1rem; }

.download-row { display: flex; flex-wrap: wrap; gap: .6rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .8rem 1.15rem; border-radius: 999px; font-weight: 700; font-size: .92rem;
  transition: transform .15s var(--ease-out), box-shadow .15s var(--ease-out), background .15s var(--ease-out);
}
.btn-primary { background: var(--ink); color: var(--bg); box-shadow: var(--shadow-sm); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { transform: translateY(-1px); background: var(--accent-2); }
.btn-ghost { background: var(--surface-alt); border: 1px solid var(--border); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: .55rem .85rem; font-size: .84rem; }
.btn[disabled] { opacity: .55; pointer-events: none; }
.btn-block { width: 100%; }

.privacy-badge {
  display: flex; align-items: flex-start; gap: .55rem;
  margin-top: 1.1rem; padding: .75rem .95rem;
  background: color-mix(in srgb, var(--ok) 10%, transparent);
  border-radius: var(--radius-sm); font-size: .85rem; color: var(--ink-soft);
}
.privacy-badge svg { width: 18px; height: 18px; flex: none; color: var(--ok); margin-top: .1rem; }
.privacy-badge strong { color: var(--ink); }

.limits-note { margin-top: .5rem; font-size: .78rem; color: var(--ink-soft); }

.needs-js-note {
  display: none; padding: 1rem; border-radius: var(--radius-sm);
  background: var(--warn-bg); color: var(--warn); font-size: .9rem;
}
.no-js .needs-js-note { display: block; }
.no-js .tool-grid { display: none; }

/* =============================================================
   6. Ad slots (placeholders only — no real ad code)
   ============================================================= */
.ad-slot {
  display: flex; align-items: center; justify-content: center;
  border: 1.5px dashed var(--border); border-radius: var(--radius-sm);
  background: repeating-linear-gradient(135deg, var(--surface-alt), var(--surface-alt) 10px, var(--surface) 10px, var(--surface) 20px);
  color: var(--ink-soft); font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
}
.ad-slot span { background: var(--surface); padding: .3rem .7rem; border-radius: 999px; border: 1px solid var(--border); }
.ad-slot--leaderboard { min-height: 90px; margin-block: 2.5rem; }
.ad-slot--incontent { min-height: 250px; margin-block: 2.5rem; max-width: 728px; margin-inline: auto; }
.ad-slot--dialog { min-height: 250px; width: 100%; margin-top: 1rem; }

.corner-toast {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 60;
  width: min(280px, calc(100vw - 2rem));
  background: var(--surface); border: 1.5px dashed var(--border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg); padding: .9rem;
  display: none; gap: .6rem; align-items: flex-start;
  transform: translateY(12px); opacity: 0;
  transition: transform .3s var(--ease-out), opacity .3s var(--ease-out);
}
.corner-toast.is-visible { display: flex; transform: translateY(0); opacity: 1; }
.corner-toast .ad-slot { flex: 1; min-height: 70px; }
.corner-toast-close {
  position: absolute; top: -.5rem; right: -.5rem; width: 24px; height: 24px; border-radius: 50%;
  background: var(--ink); color: var(--bg); display: flex; align-items: center; justify-content: center;
  font-size: .8rem; box-shadow: var(--shadow-sm);
}

.download-dialog {
  border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: 1.5rem; width: min(420px, calc(100vw - 2rem)); background: var(--surface); color: var(--ink);
}
.download-dialog::backdrop { background: rgba(15, 15, 20, .5); backdrop-filter: blur(2px); }
.dialog-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.dialog-head h3 { font-size: 1.05rem; }
.dialog-close { font-size: 1.3rem; line-height: 1; color: var(--ink-soft); padding: .2rem; }
.dialog-body p { margin-top: .5rem; font-size: .88rem; color: var(--ink-soft); }

/* =============================================================
   7. Content sections
   ============================================================= */
.steps-grid { display: grid; grid-template-columns: 1fr; gap: 1.1rem; }
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(3, 1fr); } }
.step-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; display: flex; flex-direction: column; gap: .5rem;
}
.step-card h3 { font-size: 1.02rem; color: var(--accent); }
.step-card p { color: var(--ink-soft); font-size: .92rem; }

.seo-copy { max-width: 760px; display: flex; flex-direction: column; gap: 1rem; color: var(--ink-soft); }
.seo-copy h2 { color: var(--ink); font-size: 1.5rem; margin-bottom: .2rem; }
.seo-copy strong { color: var(--ink); }

.usecase-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 620px) { .usecase-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .usecase-grid { grid-template-columns: repeat(3, 1fr); } }
.usecase-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.3rem; display: flex; flex-direction: column; gap: .5rem;
}
.usecase-card .emoji { font-size: 1.7rem; }
.usecase-card h3 { font-size: 1rem; }
.usecase-card p { color: var(--ink-soft); font-size: .88rem; }

.faq-list { display: flex; flex-direction: column; gap: .7rem; max-width: 760px; }
.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface);
  padding: .2rem .2rem;
}
.faq-item summary {
  cursor: pointer; list-style: none; padding: .95rem 1.1rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  font-weight: 700; font-size: .96rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 1.3rem; color: var(--accent); font-weight: 400; flex: none;
  transition: transform .2s var(--ease-out);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 1.1rem 1.1rem; color: var(--ink-soft); font-size: .92rem; }

.legal-page {
  max-width: 720px; margin-inline: auto; padding: 3rem 1.25rem 4rem;
  display: flex; flex-direction: column; gap: 1rem;
}
.legal-page h1 { margin-bottom: .5rem; }
.legal-page h2 { font-size: 1.15rem; margin-top: 1rem; }
.legal-page p { color: var(--ink-soft); }

/* =============================================================
   8. Responsive
   ============================================================= */
@media (max-width: 539px) {
  .style-grid { grid-template-columns: repeat(2, 1fr); }
  .format-grid { grid-template-columns: repeat(3, 1fr); }
  .color-row { flex-direction: column; }
}

/* =============================================================
   9. Reduced-motion (only intrusive effects)
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  .corner-toast { transition: none; }
}