/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f6f4ee;
  --bg-alt: #edeadf;
  --surface: #ffffff;
  --surface-2: #f1efe6;
  --text: #1e211c;
  --text-muted: #5c6156;
  --border: #ddd7c6;
  --accent: #2f6b4f;
  --accent-strong: #234f3b;
  --accent-contrast: #ffffff;
  --danger: #a4442c;
  --warn-bg: #fbeee0;
  --warn-text: #7a4a12;
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --shadow-1: 0 1px 2px rgba(30, 33, 28, .06), 0 1px 1px rgba(30, 33, 28, .04);
  --shadow-2: 0 8px 24px rgba(30, 33, 28, .10), 0 2px 6px rgba(30, 33, 28, .06);
  --serif: "Fraunces", Georgia, serif;
  --sans: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14170f;
    --bg-alt: #191d13;
    --surface: #1d2117;
    --surface-2: #232a1c;
    --text: #f0eee2;
    --text-muted: #a8ac9c;
    --border: #333a29;
    --accent: #5fae82;
    --accent-strong: #7ec89e;
    --accent-contrast: #0e130c;
    --warn-bg: #2c2210;
    --warn-text: #e3b877;
    --shadow-1: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow-2: 0 8px 24px rgba(0, 0, 0, .4);
  }
}
:root[data-theme="dark"] {
  --bg: #14170f;
  --bg-alt: #191d13;
  --surface: #1d2117;
  --surface-2: #232a1c;
  --text: #f0eee2;
  --text-muted: #a8ac9c;
  --border: #333a29;
  --accent: #5fae82;
  --accent-strong: #7ec89e;
  --accent-contrast: #0e130c;
  --warn-bg: #2c2210;
  --warn-text: #e3b877;
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; overflow-x: clip; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
input, select { font: inherit; color: inherit; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { font-family: var(--serif); text-wrap: balance; line-height: 1.08; letter-spacing: -0.01em; font-weight: 600; }
::selection { background: var(--accent); color: var(--accent-contrast); }
: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(--surface); color: var(--text);
  z-index: 9999; border-radius: 8px; font-weight: 600; box-shadow: var(--shadow-2);
}
.skip-link:focus { top: 1rem; }

.container { width: 100%; max-width: 1080px; margin-inline: auto; padding-inline: 1.1rem; }

/* =============================================================
   3. Header / footer
   ============================================================= */
.site-header { padding-block: 1.1rem; border-bottom: 1px solid var(--border); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.logo { display: flex; align-items: center; gap: .5rem; font-family: var(--serif); font-weight: 600; font-size: 1.25rem; color: var(--text); }
.logo svg { color: var(--accent); }
.header-tagline { display: none; color: var(--text-muted); font-size: .9rem; }
@media (min-width: 720px) { .header-tagline { display: block; } }

.site-footer { border-top: 1px solid var(--border); margin-top: 3rem; padding-block: 1.6rem; color: var(--text-muted); font-size: .9rem; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .8rem; }
.footer-nav { display: flex; gap: 1.2rem; }
.footer-nav a:hover { color: var(--accent); }
.attribution { color: var(--text-muted); font-size: .82rem; margin-top: 2rem; }
.attribution a { text-decoration: underline; }

/* =============================================================
   4. Hero
   ============================================================= */
.hero { padding-block: 2.2rem 1.4rem; text-align: center; }
.hero h1 { font-size: clamp(1.7rem, 4.4vw, 2.7rem); max-width: 20ch; margin-inline: auto; }
.hero-sub { margin: .9rem auto 0; max-width: 56ch; color: var(--text-muted); font-size: 1.05rem; }

/* =============================================================
   5. Tool card
   ============================================================= */
.tool-section { padding-block: .4rem 1.6rem; }
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-2);
  padding: 1.2rem;
}
@media (min-width: 720px) { .tool-card { padding: 1.8rem; } }

.tabs { display: flex; gap: .4rem; border-bottom: 1px solid var(--border); margin-bottom: 1.1rem; }
.tab { padding: .7rem .9rem; font-weight: 600; color: var(--text-muted); border-bottom: 2px solid transparent; transition: color .2s var(--ease-out); }
.tab[aria-selected="true"] { color: var(--accent-strong); border-bottom-color: var(--accent); }
.tab:hover { color: var(--text); }

.search-row { display: flex; gap: .5rem; flex-wrap: wrap; }
.search-row input { flex: 1 1 220px; padding: .8rem .9rem; border: 1px solid var(--border); border-radius: var(--radius-m); background: var(--bg); }
.hint { color: var(--text-muted); font-size: .85rem; margin-top: .5rem; }

.result-list { list-style: none; margin-top: .8rem; display: grid; gap: .4rem; max-height: 280px; overflow-y: auto; }
.result-item { width: 100%; text-align: left; padding: .65rem .8rem; border: 1px solid var(--border); border-radius: var(--radius-s); background: var(--bg); transition: border-color .15s var(--ease-out), background .15s var(--ease-out); }
.result-item:hover, .result-item:focus-visible { border-color: var(--accent); background: var(--surface-2); }
.result-name { display: block; font-weight: 700; }
.result-badge { font-size: .7rem; font-weight: 600; color: var(--accent-strong); background: color-mix(in srgb, var(--accent) 16%, transparent); padding: .1rem .4rem; border-radius: 999px; margin-left: .3rem; }
.result-detail { display: block; font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }
.result-empty { padding: .6rem; color: var(--text-muted); font-size: .9rem; }

.dropzone {
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  padding: 2.2rem 1rem; border: 2px dashed var(--border); border-radius: var(--radius-m);
  text-align: center; color: var(--text-muted); cursor: pointer;
  transition: border-color .15s var(--ease-out), background .15s var(--ease-out);
}
.dropzone:hover, .dropzone.is-drag { border-color: var(--accent); background: var(--surface-2); }
.dropzone svg { color: var(--accent); }
.dropzone strong { color: var(--text); }
.dropzone-file { font-weight: 600; color: var(--accent-strong); }

.source-summary { margin-top: 1rem; padding: .7rem .9rem; background: var(--surface-2); border-radius: var(--radius-s); font-size: .92rem; }

[data-controls] { margin-top: 1.3rem; padding-top: 1.3rem; border-top: 1px solid var(--border); }

.controls-grid { display: grid; gap: 1.1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .controls-grid { grid-template-columns: 1fr 1fr; } }
.control-block { display: flex; flex-direction: column; gap: .4rem; }
.control-label { font-weight: 700; font-size: .88rem; }
.control-block select, .control-block input[type="text"] { padding: .65rem .75rem; border: 1px solid var(--border); border-radius: var(--radius-s); background: var(--bg); }
.control-block input[type="text"] + input[type="text"] { margin-top: .4rem; }
.control-block input[type="range"] { accent-color: var(--accent); }

.btn-group { display: flex; flex-wrap: wrap; gap: .4rem; }
.btn-group button { padding: .55rem .8rem; border: 1px solid var(--border); border-radius: var(--radius-s); font-size: .88rem; font-weight: 600; transition: border-color .15s var(--ease-out), background .15s var(--ease-out), color .15s var(--ease-out); }
.btn-group button[aria-pressed="true"] { border-color: var(--accent); background: var(--accent); color: var(--accent-contrast); }

.color-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.color-row label { display: flex; align-items: center; gap: .4rem; font-size: .85rem; color: var(--text-muted); }
.color-row input[type="color"] { width: 34px; height: 34px; padding: 0; border: 1px solid var(--border); border-radius: 8px; background: none; }
.preset-row { display: flex; gap: .4rem; margin-top: .2rem; flex-wrap: wrap; }
.preset-swatch { width: 30px; height: 30px; border-radius: 50%; border: 2px solid var(--border); background: linear-gradient(135deg, var(--c1) 50%, var(--c2) 50%); transition: transform .15s var(--ease-out), border-color .15s var(--ease-out); }
.preset-swatch:hover { transform: scale(1.1); }
.preset-swatch[aria-pressed="true"] { border-color: var(--accent); }

.control-checks { grid-column: 1 / -1; display: flex; flex-direction: column; gap: .5rem; }
.checkline { display: flex; align-items: center; gap: .5rem; font-size: .92rem; }
.checkline input { accent-color: var(--accent); width: 17px; height: 17px; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: .8rem 1.3rem; border-radius: var(--radius-m); font-weight: 700; transition: transform .12s var(--ease-out), box-shadow .12s var(--ease-out), opacity .12s var(--ease-out); }
.btn-primary { background: var(--accent); color: var(--accent-contrast); box-shadow: var(--shadow-1); }
.btn-primary:hover { box-shadow: var(--shadow-2); }
.btn-primary:active { transform: scale(.98); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; }
.btn-secondary { background: var(--surface-2); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); }
.btn-ghost { background: transparent; border: 1px solid var(--border); }
.btn-link { display: block; margin: 1.2rem auto 0; color: var(--text-muted); font-size: .88rem; text-decoration: underline; text-underline-offset: 3px; }
.btn-link:hover { color: var(--accent-strong); }
.btn-generate { width: 100%; margin-top: 1.3rem; font-size: 1.02rem; }

.progress-wrap { margin-top: 1rem; }
.progress-track { height: 8px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.progress-bar { height: 100%; width: 0%; background: var(--accent); transition: width .25s var(--ease-out); }
.progress-label { margin-top: .5rem; font-size: .85rem; color: var(--text-muted); text-align: center; }

.error-box { margin-top: 1rem; padding: .9rem; border-radius: var(--radius-s); background: color-mix(in srgb, var(--danger) 12%, var(--surface)); border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border)); text-align: center; }
.error-box p { margin-bottom: .6rem; }

.viewer-container { position: relative; margin-top: 1.2rem; aspect-ratio: 4 / 3; max-height: 460px; border-radius: var(--radius-m); background: linear-gradient(180deg, var(--surface-2), var(--bg-alt)); overflow: hidden; border: 1px solid var(--border); }
.viewer-container canvas { width: 100%; height: 100%; }
.viewer-fallback { display: none; position: absolute; inset: 0; align-items: center; justify-content: center; text-align: center; padding: 1.5rem; color: var(--text-muted); font-size: .9rem; }
.viewer-container[data-viewer-state="nowebgl"] .viewer-fallback,
.viewer-container[data-viewer-state="error"] .viewer-fallback { display: flex; }

.stats-box { margin-top: 1rem; display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; }
@media (min-width: 540px) { .stats-box { grid-template-columns: repeat(4, 1fr); } }
.stat { background: var(--surface-2); border-radius: var(--radius-s); padding: .6rem .7rem; }
.stat span { display: block; font-size: .72rem; color: var(--text-muted); }
.stat strong { display: block; font-size: .95rem; margin-top: .15rem; }

.warnings-box:not(:empty) { margin-top: .8rem; display: grid; gap: .4rem; }
.warning { background: var(--warn-bg); color: var(--warn-text); padding: .6rem .8rem; border-radius: var(--radius-s); font-size: .86rem; }

.download-row { margin-top: 1.2rem; display: flex; gap: .7rem; flex-wrap: wrap; }
.download-row .btn { flex: 1 1 220px; }

.privacy-badge { margin-top: 1.4rem; font-size: .85rem; color: var(--text-muted); }
.limits-note { margin-top: .5rem; font-size: .8rem; color: var(--text-muted); }

/* =============================================================
   6. Ad slots
   ============================================================= */
.ad-slot { position: relative; margin-block: 1.8rem; min-height: 90px; border: 1px dashed var(--border); border-radius: var(--radius-s); display: flex; align-items: center; justify-content: center; color: var(--text-muted); background: var(--surface-2); }
.ad-slot--leaderboard { min-height: 100px; }
.ad-slot--incontent { min-height: 140px; }
.ad-label { position: absolute; top: 6px; left: 10px; font-size: .68rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }

.ad-modal { border: 1px solid var(--border); border-radius: var(--radius-m); padding: 1.4rem; max-width: 360px; width: 90vw; background: var(--surface); color: var(--text); box-shadow: var(--shadow-2); }
.ad-modal::backdrop { background: rgba(0,0,0,.5); }
.ad-modal-body { min-height: 160px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); background: var(--surface-2); border-radius: var(--radius-s); margin-top: .8rem; }
.ad-modal-close { margin-top: 1rem; width: 100%; padding: .7rem; border-radius: var(--radius-s); background: var(--accent); color: var(--accent-contrast); font-weight: 700; }
.ad-modal-close:disabled { opacity: .5; cursor: not-allowed; }

.sticky-ad { position: fixed; right: 14px; bottom: 14px; z-index: 500; width: 240px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m); box-shadow: var(--shadow-2); padding: .8rem; transform: translateY(30px); opacity: 0; pointer-events: none; transition: transform .3s var(--ease-out), opacity .3s var(--ease-out); }
.sticky-ad.is-shown { transform: translateY(0); opacity: 1; pointer-events: auto; }
.sticky-ad-body { min-height: 60px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); background: var(--surface-2); border-radius: var(--radius-s); margin-top: .6rem; font-size: .85rem; }
.sticky-ad-close { position: absolute; top: 6px; right: 8px; color: var(--text-muted); font-size: .9rem; }
@media (max-width: 539px) { .sticky-ad { left: 14px; right: 14px; width: auto; } }

/* =============================================================
   7. Content sections
   ============================================================= */
.how-section, .seo-section, .usos-section, .faq-section { padding-block: 2.2rem; }
.how-section h2, .usos-section h2, .faq-section h2, .seo-section h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); margin-bottom: 1.3rem; text-align: center; }

.steps-grid { display: grid; gap: 1.1rem; }
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(3, 1fr); } }
.step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m); padding: 1.3rem; }
.step-num { width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: var(--accent-contrast); display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: .7rem; }
.step h3 { font-size: 1.05rem; margin-bottom: .4rem; }
.step p { color: var(--text-muted); font-size: .92rem; }

.seo-section { max-width: 760px; margin-inline: auto; }
.seo-section p { color: var(--text-muted); margin-top: .8rem; }
.seo-section p:first-of-type { margin-top: 0; }
.seo-section strong { color: var(--text); }

.usos-grid { display: grid; gap: 1rem; }
@media (min-width: 540px) { .usos-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .usos-grid { grid-template-columns: repeat(3, 1fr); } }
.uso-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m); padding: 1.1rem; }
.uso-card h3 { font-size: .98rem; margin-bottom: .35rem; }
.uso-card p { color: var(--text-muted); font-size: .88rem; }

.faq-list { max-width: 760px; margin-inline: auto; display: grid; gap: .6rem; }
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-s); padding: .9rem 1rem; }
.faq-item summary { font-weight: 700; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: .8rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--accent); font-size: 1.2rem; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin-top: .6rem; color: var(--text-muted); font-size: .92rem; }