/* =============================================================
   QRelieve — Generador de códigos QR para imprimir en 3D
   1. Tokens
   ============================================================= */
:root {
  --bg: #f6f7fb;
  --bg-soft: #eef0f7;
  --surface: #ffffff;
  --surface-2: #f9fafc;
  --ink: #171a26;
  --ink-soft: #4b5169;
  --ink-mute: #757b93;
  --line: #e4e7f0;
  --line-strong: #d3d8e6;
  --accent: #5b5bff;
  --accent-ink: #ffffff;
  --accent-soft: #ecebff;
  --accent-2: #12c5a0;
  --warn: #d98a00;
  --warn-bg: #fff6e3;
  --danger: #e04848;
  --danger-bg: #fdecec;
  --ok: #12a06f;
  --ok-bg: #e7f6ef;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(20,24,45,.06), 0 2px 8px rgba(20,24,45,.05);
  --shadow: 0 6px 24px rgba(20,24,45,.09), 0 2px 6px rgba(20,24,45,.05);
  --shadow-lg: 0 18px 50px rgba(20,24,45,.16);
  --sans: "Manrope", "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --maxw: 1160px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1017;
    --bg-soft: #141826;
    --surface: #181c2a;
    --surface-2: #1f2434;
    --ink: #f2f4fb;
    --ink-soft: #c2c8db;
    --ink-mute: #8b92a9;
    --line: #2a3042;
    --line-strong: #363d52;
    --accent: #8c8cff;
    --accent-ink: #0e1017;
    --accent-soft: #21243b;
    --accent-2: #2ad6b0;
    --warn: #f0b64d;
    --warn-bg: #2e2712;
    --danger: #ff7a7a;
    --danger-bg: #331b1b;
    --ok: #4fd6a0;
    --ok-bg: #14291f;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
    --shadow: 0 8px 30px rgba(0,0,0,.5);
    --shadow-lg: 0 20px 60px rgba(0,0,0,.6);
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::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;
}
img, svg, 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, textarea { font: inherit; color: inherit; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.12; letter-spacing: -0.02em; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

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

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2rem); }
.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; }

/* =============================================================
   3. Header
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 62px; }
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 800; letter-spacing: -.03em; font-size: 1.15rem; }
.brand .logo {
  width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(140deg, var(--accent), #8f7bff); color: #fff; box-shadow: var(--shadow-sm);
}
.brand .logo svg { width: 18px; height: 18px; }
.brand small { display:block; font-size:.62rem; font-weight:600; color:var(--ink-mute); letter-spacing:0; margin-top:-2px; }
.header-links { display: flex; align-items: center; gap: 1.4rem; font-size: .92rem; font-weight: 600; color: var(--ink-soft); }
.header-links a:hover { color: var(--ink); }
@media (max-width: 600px){ .header-links a.hide-sm { display:none; } }

/* =============================================================
   4. Hero + tool
   ============================================================= */
.hero { padding-top: clamp(1.6rem, 4vw, 2.8rem); }
.hero-head { text-align: center; max-width: 760px; margin-inline: auto; margin-bottom: clamp(1.4rem, 3vw, 2rem); }
.eyebrow {
  display: inline-flex; align-items:center; gap:.4rem;
  font-size: .78rem; font-weight: 700; letter-spacing: .02em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); padding: .32rem .7rem; border-radius: 999px; margin-bottom: 1rem;
}
h1 { font-size: clamp(1.8rem, 4.6vw, 3rem); letter-spacing: -.035em; }
h1 .grad { background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-head .sub { margin-top: .9rem; font-size: clamp(1rem, 2.2vw, 1.18rem); color: var(--ink-soft); }

/* Tool layout */
.tool { display: grid; gap: 1.1rem; grid-template-columns: 1fr; }
@media (min-width: 960px){ .tool { grid-template-columns: minmax(0,1.05fr) minmax(0,.95fr); align-items: start; } }

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: clamp(1.1rem, 2.5vw, 1.5rem);
}
.panel-title { font-size: 1.02rem; font-weight: 800; display:flex; align-items:center; gap:.5rem; margin-bottom: 1rem; }
.panel-title .n { width:22px;height:22px;border-radius:6px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:.8rem;font-weight:800; }

.field { margin-bottom: 1rem; }
.field:last-child { margin-bottom: 0; }
label.lbl, .lbl { display:block; font-weight:700; font-size:.86rem; margin-bottom:.4rem; color: var(--ink); }
.hint { font-size:.78rem; color: var(--ink-mute); margin-top:.35rem; }

input[type="text"], input[type="url"], input[type="password"], textarea, select {
  width: 100%; padding: .7rem .8rem; background: var(--surface-2);
  border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); outline: none; }
textarea { resize: vertical; min-height: 68px; }

/* Segmented control (tabs / chips) */
.seg { display:flex; flex-wrap:wrap; gap:.4rem; background: var(--bg-soft); padding:.3rem; border-radius: 12px; }
.seg button {
  flex: 1 1 auto; padding:.5rem .6rem; border-radius: 9px; font-weight:700; font-size:.85rem;
  color: var(--ink-soft); transition: all .15s var(--ease-out); white-space:nowrap;
}
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow-sm); }

/* Style presets & format cards */
.grid-pick { display:grid; grid-template-columns: repeat(2,1fr); gap:.55rem; }
@media (min-width:480px){ .grid-pick.cols4 { grid-template-columns: repeat(4,1fr); } }
.pick {
  display:flex; flex-direction:column; align-items:center; gap:.4rem; text-align:center;
  padding:.7rem .5rem; border:1.5px solid var(--line-strong); border-radius: 12px; background: var(--surface-2);
  font-weight:700; font-size:.8rem; color: var(--ink-soft); transition: all .15s var(--ease-out);
}
.pick:hover { border-color: var(--accent); color: var(--ink); }
.pick[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); box-shadow: 0 0 0 1px var(--accent) inset; }
.pick .ico { width:34px; height:34px; }
.pick .ico svg, .pick .ico canvas { width:100%; height:100%; }
.pick .emoji { font-size: 1.6rem; line-height:1; }

/* Color rows */
.color-row { display:flex; gap:.8rem; }
.color-row .field { flex:1; margin:0; }
.swatch { display:flex; align-items:center; gap:.55rem; padding:.4rem .5rem; border:1.5px solid var(--line-strong); border-radius: var(--radius-sm); background: var(--surface-2); }
.swatch input[type="color"]{ width:36px; height:36px; padding:0; border:none; background:none; border-radius:8px; cursor:pointer; }
.swatch input[type="color"]::-webkit-color-swatch-wrapper{ padding:0; }
.swatch input[type="color"]::-webkit-color-swatch{ border:1px solid var(--line-strong); border-radius:6px; }
.swatch .hex { font-family: ui-monospace, monospace; font-size:.82rem; color: var(--ink-soft); text-transform: uppercase; }

/* Emoji picker */
.emoji-grid { display:flex; flex-wrap:wrap; gap:.3rem; }
.emoji-grid button { font-size:1.35rem; width:40px; height:40px; border-radius:9px; background: var(--surface-2); border:1.5px solid transparent; transition: all .12s; }
.emoji-grid button:hover { border-color: var(--line-strong); }
.emoji-grid button[aria-pressed="true"]{ border-color: var(--accent); background: var(--accent-soft); }

.range-row { display:flex; align-items:center; gap:.8rem; }
input[type="range"]{ flex:1; accent-color: var(--accent); }
.range-val { font-family: ui-monospace, monospace; font-size:.85rem; font-weight:700; min-width:64px; text-align:right; color: var(--ink-soft); }

.mini-link { font-size:.8rem; font-weight:700; color: var(--accent); cursor:pointer; }
.mini-link:hover { text-decoration: underline; }

/* =============================================================
   5. Preview column
   ============================================================= */
.preview-col { position: sticky; top: 78px; display:flex; flex-direction:column; gap: 1.1rem; }
@media (max-width: 959px){ .preview-col { position: static; } }

.previews { display:grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 520px){ .previews { grid-template-columns: 1fr 1fr; } }

.pv {
  border:1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow:hidden;
  display:flex; flex-direction:column;
}
.pv h3 { font-size:.78rem; text-transform:uppercase; letter-spacing:.04em; color:var(--ink-mute); padding:.6rem .8rem .1rem; font-weight:700; }
.pv .stage { flex:1; display:grid; place-items:center; padding:.8rem; min-height: 210px; }
#qr2d { width: 190px; height: 190px; }
#qr2d canvas, #qr2d svg { border-radius: 8px; }
#viewer3d { width:100%; height: 240px; min-height:240px; border-radius: 10px; cursor: grab; touch-action: none; background:
  radial-gradient(120% 120% at 50% 0%, color-mix(in srgb, var(--accent-soft) 60%, var(--surface)) 0%, var(--surface) 60%); }
#viewer3d:active { cursor: grabbing; }
.viewer-note { font-size:.74rem; color: var(--ink-mute); text-align:center; padding: 0 .8rem .7rem; }
.viewer-fallback { padding:1rem; text-align:center; color: var(--ink-soft); font-size:.86rem; }

/* Warnings */
.warnings { display:flex; flex-direction:column; gap:.5rem; }
.alert { display:flex; gap:.55rem; align-items:flex-start; padding:.6rem .75rem; border-radius: var(--radius-sm); font-size:.83rem; border:1px solid transparent; }
.alert .ai { flex-shrink:0; margin-top:1px; }
.alert.ok { background: var(--ok-bg); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 30%, transparent); }
.alert.warn { background: var(--warn-bg); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.alert.danger { background: var(--danger-bg); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }
.alert b { font-weight: 800; }

.metrics { display:flex; flex-wrap:wrap; gap:.5rem; margin-top:.2rem; }
.metric { flex:1 1 30%; background: var(--surface-2); border:1px solid var(--line); border-radius:10px; padding:.5rem .6rem; }
.metric .k { font-size:.68rem; text-transform:uppercase; letter-spacing:.03em; color:var(--ink-mute); font-weight:700; }
.metric .v { font-size:.98rem; font-weight:800; font-family: ui-monospace, monospace; }

/* =============================================================
   6. Download buttons
   ============================================================= */
.downloads { display:flex; flex-direction:column; gap:.7rem; }
.dl-row { display:grid; grid-template-columns: 1fr 1fr; gap:.6rem; }
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:.5rem;
  padding:.8rem 1rem; border-radius: 12px; font-weight:800; font-size:.92rem;
  transition: transform .12s var(--ease-out), box-shadow .12s, background .15s; text-align:center;
}
.btn svg { width:18px; height:18px; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-sm); }
.btn-primary:hover { box-shadow: var(--shadow); }
.btn-3d { background: linear-gradient(120deg, var(--accent), #7a6bff); color:#fff; font-size:1rem; padding:.95rem 1rem; box-shadow: var(--shadow); }
.btn-3d .tag { font-size:.68rem; background: rgba(255,255,255,.22); padding:.1rem .4rem; border-radius:6px; font-weight:800; }
.btn-ghost { background: var(--surface-2); color: var(--ink); border:1.5px solid var(--line-strong); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-sm { padding:.55rem .7rem; font-size:.82rem; }
.btn[disabled]{ opacity:.55; cursor: not-allowed; }
.btn.busy { pointer-events:none; opacity:.8; }
.spinner { width:16px;height:16px;border:2.5px solid currentColor;border-right-color:transparent;border-radius:50%;animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.dl-note { font-size:.76rem; color: var(--ink-mute); text-align:center; }
.dl-note a { color: var(--accent); font-weight:700; }

/* Privacy badge */
.privacy {
  display:flex; align-items:center; gap:.6rem; justify-content:center; text-align:center;
  font-size:.85rem; color: var(--ink-soft); background: var(--surface); border:1px solid var(--line);
  border-radius: 999px; padding:.55rem 1rem; margin: 1.2rem auto 0; max-width: 640px; box-shadow: var(--shadow-sm);
}
.privacy svg { color: var(--ok); flex-shrink:0; }

/* =============================================================
   7. Ad slots (placeholders)
   ============================================================= */
.ad-slot {
  display:grid; place-items:center; text-align:center;
  border: 2px dashed var(--line-strong); border-radius: var(--radius-sm);
  color: var(--ink-mute); background: var(--surface-2);
  font-size:.75rem; font-weight:800; letter-spacing:.14em; text-transform:uppercase;
}
.ad-slot span { opacity:.75; }
.ad-leaderboard { min-height: 100px; margin: clamp(1.6rem,4vw,2.4rem) 0; }
.ad-incontent { min-height: 250px; margin: 1.2rem 0; }

/* Corner toast ad */
.ad-toast {
  position: fixed; right: 16px; bottom: 16px; z-index: 60; width: 230px;
  background: var(--surface); border:1px solid var(--line-strong); border-radius: 14px;
  box-shadow: var(--shadow-lg); padding: .5rem; display:none;
}
.ad-toast.show { display:block; animation: toastIn .4s var(--ease-out); }
@keyframes toastIn { from { transform: translateY(12px); opacity:0; } }
.ad-toast .ad-slot { min-height: 120px; border-radius: 9px; }
.ad-toast .close { position:absolute; top:-10px; right:-10px; width:26px;height:26px;border-radius:50%; background: var(--ink); color: var(--bg); display:grid; place-items:center; box-shadow: var(--shadow); font-size:.9rem; }

/* Download popup (dialog) */
dialog.ad-modal { border:none; border-radius: var(--radius); padding:0; max-width: 440px; width: calc(100% - 2rem); background: var(--surface); color: var(--ink); box-shadow: var(--shadow-lg); }
dialog.ad-modal::backdrop { background: rgba(10,12,22,.5); backdrop-filter: blur(2px); }
.ad-modal .inner { padding: 1.2rem; }
.ad-modal .head { display:flex; align-items:center; justify-content:space-between; margin-bottom:.4rem; }
.ad-modal .head strong { font-size:1rem; }
.ad-modal .ok-line { display:flex; align-items:center; gap:.5rem; color: var(--ok); font-weight:700; font-size:.9rem; margin-bottom:.9rem; }
.ad-modal .ad-slot { min-height: 200px; margin-bottom:1rem; }
.ad-modal .close-x { width:32px;height:32px;border-radius:8px; background: var(--surface-2); display:grid; place-items:center; }
.ad-modal .close-x:hover { background: var(--bg-soft); }

/* =============================================================
   8. Content sections
   ============================================================= */
section.block { padding: clamp(2rem, 6vw, 3.6rem) 0; }
.section-head { text-align:center; max-width: 680px; margin: 0 auto clamp(1.6rem,4vw,2.4rem); }
.section-head h2 { font-size: clamp(1.5rem, 3.6vw, 2.1rem); }
.section-head p { margin-top:.6rem; color: var(--ink-soft); }

.steps { display:grid; gap: 1rem; grid-template-columns: 1fr; counter-reset: step; }
@media (min-width: 720px){ .steps { grid-template-columns: repeat(3,1fr); } }
.step { position:relative; background: var(--surface); border:1px solid var(--line); border-radius: var(--radius); padding: 1.4rem 1.2rem 1.2rem; box-shadow: var(--shadow-sm); }
.step .num { width:38px;height:38px;border-radius:11px; background: var(--accent-soft); color: var(--accent); display:grid; place-items:center; font-weight:800; margin-bottom:.8rem; }
.step h3 { font-size:1.08rem; margin-bottom:.4rem; }
.step p { font-size:.92rem; color: var(--ink-soft); }

.ideas { display:grid; gap:1rem; grid-template-columns: 1fr; }
@media (min-width: 620px){ .ideas { grid-template-columns: repeat(2,1fr); } }
@media (min-width: 960px){ .ideas { grid-template-columns: repeat(3,1fr); } }
.idea { background: var(--surface); border:1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; box-shadow: var(--shadow-sm); transition: transform .18s var(--ease-out), box-shadow .18s; }
.idea:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.idea .em { font-size: 1.7rem; margin-bottom:.5rem; }
.idea h3 { font-size:1.02rem; margin-bottom:.35rem; }
.idea p { font-size:.9rem; color: var(--ink-soft); }

/* SEO prose */
.prose { max-width: 760px; margin-inline:auto; }
.prose h2 { font-size: clamp(1.4rem,3vw,1.9rem); margin: 1.6rem 0 .7rem; }
.prose h3 { font-size: 1.12rem; margin: 1.3rem 0 .5rem; }
.prose p { color: var(--ink-soft); margin-bottom: .9rem; }
.prose ul { color: var(--ink-soft); margin: 0 0 1rem 1.1rem; }
.prose li { margin-bottom:.35rem; }
.prose strong { color: var(--ink); }

/* FAQ */
.faq { max-width: 780px; margin-inline:auto; display:flex; flex-direction:column; gap:.7rem; }
.faq details { background: var(--surface); border:1px solid var(--line); border-radius: var(--radius-sm); box-shadow: var(--shadow-sm); overflow:hidden; }
.faq summary { list-style:none; cursor:pointer; padding: 1rem 1.1rem; font-weight:700; display:flex; align-items:center; justify-content:space-between; gap:1rem; }
.faq summary::-webkit-details-marker { display:none; }
.faq summary .chev { transition: transform .2s; flex-shrink:0; color: var(--ink-mute); }
.faq details[open] summary .chev { transform: rotate(180deg); }
.faq details .a { padding: 0 1.1rem 1.1rem; color: var(--ink-soft); font-size:.94rem; }

/* =============================================================
   9. Footer
   ============================================================= */
.site-footer { border-top:1px solid var(--line); background: var(--surface); margin-top: 2rem; }
.site-footer .container { padding-block: 2rem; display:flex; flex-wrap:wrap; gap:1.2rem; justify-content:space-between; align-items:center; }
.site-footer .brand { font-size:1rem; }
.footer-links { display:flex; flex-wrap:wrap; gap:1.1rem; font-size:.86rem; color: var(--ink-soft); font-weight:600; }
.footer-links a:hover { color: var(--ink); }
.footer-legal { width:100%; font-size:.78rem; color: var(--ink-mute); border-top:1px solid var(--line); padding-top:1rem; }

/* Toast confirm (copy/download) */
.toast {
  position: fixed; left:50%; bottom: 22px; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--bg); padding:.7rem 1.1rem; border-radius: 999px;
  font-size:.86rem; font-weight:700; box-shadow: var(--shadow-lg); opacity:0; pointer-events:none;
  transition: opacity .25s, transform .25s var(--ease-out); z-index: 80;
}
.toast.show { opacity:1; transform: translateX(-50%) translateY(0); }

/* No-JS notice */
.nojs { background: var(--warn-bg); color: var(--warn); border:1px solid color-mix(in srgb,var(--warn) 30%,transparent); border-radius: var(--radius-sm); padding: 1rem; text-align:center; font-weight:600; }

/* Legal pages */
.legal-page { max-width: 780px; }
.legal-page h1 { font-size: clamp(1.6rem,4vw,2.2rem); margin-bottom: 1rem; }
.legal-page h2 { font-size:1.2rem; margin: 1.6rem 0 .5rem; }
.legal-page p, .legal-page li { color: var(--ink-soft); margin-bottom:.7rem; }
.legal-page ul { margin-left: 1.1rem; }
.todo { background: var(--warn-bg); color: var(--warn); padding:.2rem .4rem; border-radius:5px; font-weight:700; font-size:.85em; }