/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #eef0f6;
  --text: #171a23;
  --text-soft: #565b6d;
  --border: #dfe2ec;
  --accent: #2f5df5;
  --accent-2: #14b892;
  --accent-contrast: #ffffff;
  --warn: #b9720a;
  --warn-bg: #fff4e0;
  --danger: #d1382f;
  --danger-bg: #fdeceb;
  --ok: #157a4d;
  --ok-bg: #e7f7ef;
  --shadow-sm: 0 1px 2px rgba(20, 22, 40, 0.06), 0 1px 1px rgba(20,22,40,.04);
  --shadow-md: 0 8px 24px rgba(20, 22, 40, 0.08);
  --shadow-lg: 0 20px 48px rgba(20, 22, 40, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --display: "Manrope", var(--sans);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --container: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10121a;
    --surface: #171a24;
    --surface-2: #1f2330;
    --text: #eef0f8;
    --text-soft: #a4a9bd;
    --border: #2b2f3f;
    --warn-bg: #3a2c0f;
    --danger-bg: #3a1e1d;
    --ok-bg: #123527;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
    --shadow-md: 0 8px 24px rgba(0,0,0,.45);
    --shadow-lg: 0 20px 48px rgba(0,0,0,.55);
  }
}

/* =============================================================
   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 {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  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 { font-family: var(--display); text-wrap: balance; line-height: 1.12; letter-spacing: -0.01em; font-weight: 800; }
ul { list-style: none; padding: 0; }
::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* =============================================================
   3. Utilities
   ============================================================= */
.container { width: min(100% - 2.4rem, var(--container)); margin-inline: auto; }
.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--text); color: var(--bg);
  z-index: 9999; border-radius: 8px; font-weight: 600;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }
.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: .8rem; font-weight: 700; letter-spacing: .02em;
  color: var(--accent); text-transform: uppercase;
}
.section-head { max-width: 62ch; margin-bottom: 2.2rem; }
.section-head p { color: var(--text-soft); margin-top: .6rem; font-size: 1.05rem; }
section { padding-block: clamp(3rem, 6vw, 5.5rem); }

/* =============================================================
   4. Header
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
@supports not (backdrop-filter: blur(1px)) {
  .site-header { background: var(--bg); }
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 800; font-family: var(--display); font-size: 1.05rem; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; color: #fff; flex: none;
}
.brand-mark svg { width: 18px; height: 18px; }
.header-nav { display: flex; align-items: center; gap: 1.4rem; }
.header-nav a { font-size: .92rem; font-weight: 600; color: var(--text-soft); transition: color .2s var(--ease-out); }
.header-nav a:hover { color: var(--accent); }
.header-cta {
  background: var(--text); color: var(--bg);
  padding: .55rem 1rem; border-radius: 999px; font-weight: 700; font-size: .88rem;
}

/* =============================================================
   5. Hero
   ============================================================= */
.hero { padding-block: clamp(2.2rem, 5vw, 3.6rem) 1.2rem; }
.hero-head { max-width: 74ch; margin-inline: auto; text-align: center; }
.hero-head h1 { font-size: clamp(1.9rem, 4.4vw, 3.1rem); }
.hero-head .lede { margin-top: .9rem; font-size: clamp(1rem, 1.6vw, 1.2rem); color: var(--text-soft); max-width: 60ch; margin-inline: auto; }
.trust-row {
  display: flex; flex-wrap: wrap; gap: .5rem .9rem; justify-content: center;
  margin-top: 1.3rem; font-size: .85rem; color: var(--text-soft);
}
.trust-row span { display: inline-flex; align-items: center; gap: .35rem; }
.trust-row svg { width: 15px; height: 15px; color: var(--accent-2); flex: none; }

/* =============================================================
   6. Tool card
   ============================================================= */
.tool-wrap { margin-top: 2.2rem; }
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: clamp(1.2rem, 3vw, 2rem);
}
.tool-grid {
  display: grid; gap: 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 960px) {
  .tool-grid { grid-template-columns: 1.05fr 0.95fr; align-items: start; }
}
.tool-col-controls { display: flex; flex-direction: column; gap: 1.3rem; }
.tool-col-preview { display: flex; flex-direction: column; gap: 1rem; position: sticky; top: 84px; }

.field-group { display: flex; flex-direction: column; gap: .5rem; }
.field-group > label, .field-label {
  font-size: .82rem; font-weight: 700; color: var(--text-soft);
  text-transform: uppercase; letter-spacing: .03em;
}
.text-input, .select-input {
  width: 100%; padding: .72rem .9rem;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
  font-size: .98rem; transition: border-color .2s var(--ease-out), box-shadow .2s var(--ease-out);
}
.text-input:focus, .select-input:focus {
  border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}

.mode-tabs { display: inline-flex; padding: .25rem; background: var(--surface-2); border-radius: 999px; gap: .2rem; }
.mode-tabs button {
  padding: .5rem 1rem; border-radius: 999px; font-weight: 700; font-size: .88rem; color: var(--text-soft);
  transition: background .2s var(--ease-out), color .2s var(--ease-out);
}
.mode-tabs button[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }

.wifi-fields { display: grid; grid-template-columns: 1fr; gap: .8rem; }
@media (min-width: 540px) { .wifi-fields { grid-template-columns: 1.3fr 1fr; } }
[data-mode-panel] { display: none; }
[data-mode-panel].is-active { display: block; }

.style-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .55rem; }
@media (max-width: 539px) { .style-grid { grid-template-columns: repeat(2, 1fr); } }
.style-opt {
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  padding: .7rem .4rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: .78rem; font-weight: 700; color: var(--text-soft);
  transition: border-color .2s var(--ease-out), background .2s var(--ease-out), color .2s var(--ease-out);
}
.style-opt svg { width: 26px; height: 26px; }
.style-opt[aria-pressed="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); color: var(--accent); }

.color-row { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.color-field {
  display: flex; align-items: center; gap: .65rem;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm); padding: .5rem .7rem;
}
.color-field input[type="color"] {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
  padding: 0; background: none; flex: none; cursor: pointer;
}
.color-field .color-meta { display: flex; flex-direction: column; gap: .1rem; min-width: 0; }
.color-field .color-meta small { color: var(--text-soft); font-size: .72rem; text-transform: uppercase; letter-spacing: .02em; }
.color-field .color-meta span { font-size: .82rem; font-weight: 700; font-family: var(--mono); }
.swap-colors-btn {
  align-self: flex-start; font-size: .82rem; font-weight: 700; color: var(--accent);
  display: inline-flex; align-items: center; gap: .35rem;
}
.swap-colors-btn svg { width: 15px; height: 15px; }

.center-tabs { display: flex; gap: .4rem; flex-wrap: wrap; }
.center-tabs button {
  padding: .45rem .85rem; border: 1.5px solid var(--border); border-radius: 999px;
  font-size: .82rem; font-weight: 700; color: var(--text-soft);
}
.center-tabs button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }
.emoji-grid { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .6rem; }
.emoji-grid button {
  width: 40px; height: 40px; font-size: 1.25rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  display: grid; place-items: center; transition: border-color .2s var(--ease-out);
}
.emoji-grid button[aria-pressed="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--surface)); }
.file-drop {
  border: 1.5px dashed var(--border); border-radius: var(--radius-sm);
  padding: 1rem; text-align: center; font-size: .85rem; color: var(--text-soft);
  cursor: pointer; margin-top: .6rem; transition: border-color .2s var(--ease-out), background .2s var(--ease-out);
}
.file-drop.is-dragover, .file-drop:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 6%, var(--surface)); }
.file-drop input { display: none; }
.logo-preview { display: flex; align-items: center; gap: .6rem; margin-top: .5rem; font-size: .85rem; }
.logo-preview img { width: 36px; height: 36px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }
.remove-center-btn { color: var(--danger); font-weight: 700; font-size: .8rem; }

.download-row { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .3rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .8rem 1.3rem; border-radius: 999px; font-weight: 700; font-size: .92rem;
  transition: transform .15s var(--ease-out), box-shadow .15s var(--ease-out), background .2s var(--ease-out), opacity .2s;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px color-mix(in srgb, var(--accent) 35%, transparent); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 26px color-mix(in srgb, var(--accent) 45%, transparent); }
.btn-secondary { background: var(--surface-2); color: var(--text); }
.btn-secondary:hover { background: var(--border); }
.btn-ghost { background: transparent; color: var(--text-soft); border: 1.5px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: .55rem .95rem; font-size: .82rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }
.btn-block { width: 100%; }

/* Preview column */
.preview-panel {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 1rem; display: flex; flex-direction: column; align-items: center; gap: .8rem;
}
.qr-preview-box {
  width: 100%; max-width: 280px; aspect-ratio: 1; background: #fff; border-radius: var(--radius-sm);
  display: grid; place-items: center; overflow: hidden; box-shadow: var(--shadow-sm);
}
.qr-preview-box canvas, .qr-preview-box svg, .qr-preview-box img { width: 100%; height: 100%; }
.privacy-badge {
  display: inline-flex; align-items: center; gap: .45rem; font-size: .8rem; color: var(--ok);
  background: var(--ok-bg); padding: .45rem .7rem; border-radius: 999px; font-weight: 700;
}
.privacy-badge svg { width: 14px; height: 14px; flex: none; }
.limits-note { font-size: .78rem; color: var(--text-soft); text-align: center; }

.format-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem; }
.format-tabs button {
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  padding: .8rem .4rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: .78rem; font-weight: 700; color: var(--text-soft);
}
.format-tabs button svg { width: 26px; height: 26px; }
.format-tabs button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }

.viewer-3d-wrap {
  width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius-sm); overflow: hidden;
  background: radial-gradient(circle at 50% 30%, #2b2f42, #14151d);
  position: relative;
}
.viewer-3d-wrap canvas { width: 100% !important; height: 100% !important; display: block; }
.viewer-status {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: .85rem; font-weight: 600; text-align: center; padding: 1rem; gap: .5rem; flex-direction: column;
  background: rgba(15,16,24,.35);
}
.viewer-status.is-hidden { display: none; }
.viewer-hint { font-size: .74rem; color: var(--text-soft); text-align: center; }

.quality-panel { display: flex; flex-direction: column; gap: .5rem; width: 100%; }
.quality-row {
  display: flex; align-items: center; justify-content: space-between; gap: .6rem;
  font-size: .82rem; padding: .5rem .7rem; border-radius: var(--radius-sm);
  background: var(--surface); border: 1px solid var(--border);
}
.quality-row .q-label { color: var(--text-soft); font-weight: 600; }
.quality-row .q-val { font-weight: 800; font-family: var(--mono); }
.quality-row.is-ok .q-val { color: var(--ok); }
.quality-row.is-warn .q-val { color: var(--warn); }
.quality-row.is-bad .q-val { color: var(--danger); }
.quality-msg {
  font-size: .78rem; padding: .55rem .7rem; border-radius: var(--radius-sm);
  background: var(--warn-bg); color: var(--warn); font-weight: 600; display: none;
}
.quality-msg.is-visible { display: block; }
.quality-msg.is-bad { background: var(--danger-bg); color: var(--danger); }

/* =============================================================
   7. Ad slots
   ============================================================= */
.ad-slot {
  border: 1.5px dashed var(--border); border-radius: var(--radius-sm);
  display: grid; place-items: center; color: var(--text-soft);
  font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  background: color-mix(in srgb, var(--surface-2) 60%, transparent);
}
.ad-slot small { display: block; font-weight: 500; text-transform: none; letter-spacing: 0; margin-top: .25rem; font-size: .72rem; }
.ad-leaderboard { min-height: 100px; margin-block: 2.4rem; }
.ad-incontent { min-height: 250px; margin-block: 2.4rem; }

.ad-popup {
  border: none; border-radius: var(--radius-lg); padding: 0; max-width: 420px; width: min(92vw, 420px);
  box-shadow: var(--shadow-lg); background: var(--surface); color: var(--text);
}
.ad-popup::backdrop { background: rgba(10,11,18,.55); backdrop-filter: blur(2px); }
.ad-popup-inner { padding: 1.1rem; display: flex; flex-direction: column; gap: .8rem; }
.ad-popup-head { display: flex; align-items: center; justify-content: space-between; }
.ad-popup-head span { font-size: .78rem; font-weight: 700; color: var(--text-soft); text-transform: uppercase; letter-spacing: .06em; }
.ad-popup-close { width: 30px; height: 30px; border-radius: 999px; background: var(--surface-2); display: grid; place-items: center; }
.ad-popup-close svg { width: 15px; height: 15px; }
.ad-popup .ad-slot { min-height: 220px; }
.ad-popup-foot { display: flex; justify-content: flex-end; }

.corner-toast {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 60;
  width: min(90vw, 300px); background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  padding: .8rem .9rem; display: flex; gap: .7rem; align-items: flex-start;
  transform: translateY(140%); opacity: 0; transition: transform .4s var(--ease-out), opacity .4s var(--ease-out);
}
.corner-toast.is-visible { transform: translateY(0); opacity: 1; }
.corner-toast .ad-slot { flex: 1; min-height: 64px; }
.corner-toast-close { width: 22px; height: 22px; border-radius: 999px; background: var(--surface-2); display: grid; place-items: center; flex: none; }
.corner-toast-close svg { width: 12px; height: 12px; }

/* =============================================================
   8. Content sections
   ============================================================= */
.steps-grid { display: grid; gap: 1.2rem; grid-template-columns: 1fr; }
@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-md);
  padding: 1.3rem; box-shadow: var(--shadow-sm);
}
.step-card .step-num {
  width: 34px; height: 34px; border-radius: 10px; background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--accent); font-weight: 800; display: grid; place-items: center; margin-bottom: .8rem; font-family: var(--mono);
}
.step-card h3 { font-size: 1.02rem; margin-bottom: .4rem; }
.step-card p { color: var(--text-soft); font-size: .92rem; }

.seo-copy { max-width: 74ch; color: var(--text-soft); display: flex; flex-direction: column; gap: 1rem; }
.seo-copy h2 { color: var(--text); }

.usecases-grid { display: grid; gap: 1rem; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 720px) { .usecases-grid { grid-template-columns: repeat(3, 1fr); } }
.usecase-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 1.1rem; display: flex; flex-direction: column; gap: .5rem;
}
.usecase-card .uc-emoji { font-size: 1.6rem; }
.usecase-card h3 { font-size: .96rem; }
.usecase-card p { font-size: .85rem; color: var(--text-soft); }

.faq-list { display: flex; flex-direction: column; gap: .6rem; max-width: 80ch; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: .2rem .3rem;
}
.faq-item summary {
  list-style: none; cursor: pointer; padding: 1rem 1.1rem; font-weight: 700; font-size: .96rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .chev { flex: none; width: 18px; height: 18px; transition: transform .2s var(--ease-out); color: var(--text-soft); }
.faq-item[open] summary .chev { transform: rotate(180deg); }
.faq-item .faq-a { padding: 0 1.1rem 1.1rem; color: var(--text-soft); font-size: .92rem; }

/* =============================================================
   9. Footer
   ============================================================= */
.site-footer { border-top: 1px solid var(--border); padding-block: 2.4rem; margin-top: 1rem; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.1rem; font-size: .85rem; color: var(--text-soft); }
.footer-links a:hover { color: var(--accent); }
.footer-note { font-size: .78rem; color: var(--text-soft); margin-top: 1rem; max-width: 80ch; }

/* legal pages */
.legal-page { padding-block: 3rem; }
.legal-page .container { max-width: 78ch; }
.legal-page h1 { margin-bottom: 1.2rem; }
.legal-page h2 { margin-top: 1.6rem; margin-bottom: .5rem; font-size: 1.1rem; }
.legal-page p, .legal-page li { color: var(--text-soft); margin-bottom: .7rem; }
.legal-page li { list-style: disc; margin-left: 1.3rem; }

/* =============================================================
   10. Responsive misc
   ============================================================= */
@media (max-width: 719px) {
  .header-nav a:not(.header-cta) { display: none; }
  .tool-col-preview { position: static; }
}