/* ==========================================================================
   QR Studio — modern, mobile-first, RTL-aware, light/dark via CSS variables
   ========================================================================== */
:root {
  --bg: #f6f7fb; --surface: #ffffff; --surface-2: #eef1f7;
  --text: #0f172a; --muted: #5b6474; --border: #e3e7ef;
  --accent: #4f46e5; --accent-2: #4338ca; --accent-soft: #eef0ff;
  --warn: #92400e; --warn-bg: #fef3c7; --err: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .07);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
          "Noto Sans", "Noto Sans Arabic", "Noto Naskh Arabic", "Noto Sans Devanagari",
          "Noto Sans SC", sans-serif;
}
[data-theme="dark"] {
  --bg: #0b0f19; --surface: #121826; --surface-2: #1a2234;
  --text: #e6e9f2; --muted: #98a2b8; --border: #24304a;
  --accent: #818cf8; --accent-2: #6366f1; --accent-soft: #1e2542;
  --warn: #fbbf24; --warn-bg: #3a2c07; --err: #f87171;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--text);
       line-height: 1.55; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; }
[hidden] { display: none !important; }
.container { max-width: 1180px; margin-inline: auto; padding-inline: 20px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.skip { position: absolute; inset-inline-start: -999px; top: 8px; background: var(--accent);
        color: #fff; padding: .5rem 1rem; border-radius: 8px; z-index: 100; }
.skip:focus { inset-inline-start: 8px; }

/* ------------------------------- header --------------------------------- */
.site-header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between;
  gap: 12px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800;
  font-size: 1.1rem; color: var(--text); text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn, #langBtn { display: inline-flex; align-items: center; gap: 7px; height: 40px;
  padding-inline: 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer; font: inherit; }
.icon-btn:hover, #langBtn:hover { border-color: var(--accent); }
/* dark-mode icon swap */
[data-theme="light"] .i-moon { display: none; }
[data-theme="dark"] .i-sun { display: none; }

.lang-wrap { position: relative; }
#langMenu { position: absolute; inset-inline-end: 0; top: calc(100% + 6px); margin: 0;
  padding: 6px; list-style: none; background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; box-shadow: var(--shadow); min-width: 190px; max-height: 320px;
  overflow: auto; z-index: 60; }
#langMenu li { padding: 9px 12px; border-radius: 8px; cursor: pointer; }
#langMenu li:hover, #langMenu li:focus-visible { background: var(--surface-2); }
#langMenu li[aria-selected="true"] { background: var(--accent-soft); color: var(--accent);
  font-weight: 700; }

/* -------------------------------- hero ---------------------------------- */
.hero { text-align: center; padding: 40px 0 8px; }
.hero h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); margin: 0 0 10px; letter-spacing: -.02em; }
.lead { color: var(--muted); max-width: 640px; margin: 0 auto 16px; }
.privacy-pill { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px;
  border-radius: 999px; background: var(--surface); border: 1px solid var(--border);
  color: var(--muted); font-size: .85rem; margin: 0; }

/* ------------------------------ layout ---------------------------------- */
.app-grid { display: grid; gap: 22px; grid-template-columns: minmax(0, 1fr);
  padding-block: 26px 10px; }
@media (min-width: 1060px) {
  .app-grid { grid-template-columns: minmax(0, 1fr) 400px; align-items: start; }
  .preview-card { position: sticky; top: 82px; }
}
@media (max-width: 1059px) { .preview-col { order: -1; } }

.card { background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 22px; }
.card h2 { margin: 0 0 14px; font-size: 1.05rem; }
.card h3.sub { margin: 18px 0 8px; font-size: .95rem; color: var(--muted); }

/* ------------------------------- tabs ----------------------------------- */
.tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px;
  scrollbar-width: thin; margin-bottom: 16px; }
.tabs button { flex: 0 0 auto; padding: 9px 16px; min-height: 42px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
  font: inherit; font-weight: 600; font-size: .88rem; cursor: pointer; transition: .15s; }
.tabs button:hover { border-color: var(--accent); }
.tabs button[aria-selected="true"] { background: var(--accent); border-color: var(--accent);
  color: #fff; }

/* ------------------------------ fields ---------------------------------- */
.panel { animation: fade .18s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(3px); } }
.grid2 { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 560px) { .grid2 { grid-template-columns: 1fr 1fr; } .span2 { grid-column: span 2; } }
.field { margin-bottom: 13px; min-width: 0; }
.field label, .field .label { display: block; font-size: .85rem; font-weight: 600;
  color: var(--muted); margin-bottom: 6px; }
input[type="text"], input[type="url"], input[type="tel"], input[type="email"],
input[type="number"], input[type="password"], input[type="datetime-local"],
textarea, select {
  width: 100%; padding: 11px 12px; min-height: 44px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font: inherit; transition: border-color .15s; }
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus { border-color: var(--accent);
  outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.err { display: block; color: var(--err); font-size: .8rem; min-height: 1.1em; }
.hint { color: var(--muted); font-size: .78rem; }
output { font-size: .8rem; color: var(--muted); margin-inline-start: 8px; }

.check { display: flex; align-items: center; gap: 9px; margin: 8px 0; cursor: pointer; }
.check input { width: 19px; height: 19px; accent-color: var(--accent); }

input[type="color"] { width: 46px; height: 40px; padding: 2px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--surface); cursor: pointer; }
input[type="range"] { width: 100%; accent-color: var(--accent); min-height: 32px; }

/* segmented radio group */
.segmented { display: flex; gap: 4px; background: var(--surface-2); border-radius: 12px;
  padding: 4px; }
.segmented label { flex: 1; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented span { display: block; text-align: center; padding: 9px 4px; min-height: 42px;
  border-radius: 9px; cursor: pointer; font-weight: 700; font-size: .85rem; transition: .15s; }
.segmented input:checked + span { background: var(--surface); box-shadow: var(--shadow);
  color: var(--accent); }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px; }
.segmented:has(input:disabled) { opacity: .55; }

/* preset chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips button { padding: 8px 14px; min-height: 40px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
  font: inherit; font-size: .85rem; font-weight: 600; transition: .15s; }
.chips button:hover { border-color: var(--accent); color: var(--accent); }

/* ------------------------------ dropzone -------------------------------- */
.dropzone { border: 2px dashed var(--border); border-radius: 12px; padding: 26px 16px;
  text-align: center; color: var(--muted); cursor: pointer; transition: .15s; }
.dropzone.drag { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.dropzone p { margin: 10px 0 4px; }
.link { background: none; border: none; color: var(--accent); font: inherit;
  font-weight: 700; cursor: pointer; text-decoration: underline; padding: 0; }
.logo-row { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
#logoThumb { width: 64px; height: 64px; object-fit: contain; border: 1px solid var(--border);
  border-radius: 10px; background: var(--surface-2); padding: 4px; }
.btn.small { padding: 8px 12px; }

/* ------------------------------ preview --------------------------------- */
.qr-stage { display: grid; place-items: center; min-height: 290px; padding: 16px;
  border-radius: 12px; background: var(--surface-2); position: relative; }
.qr-stage.checker { background: repeating-conic-gradient(#d7dbe4 0 25%, #ffffff 0 50%) 0 0 / 18px 18px; }
[data-theme="dark"] .qr-stage.checker { background: repeating-conic-gradient(#232c42 0 25%, #171e30 0 50%) 0 0 / 18px 18px; }
#qrPreview { width: 100%; height: auto; border-radius: 8px; animation: fade .18s ease; }
.empty { color: var(--muted); text-align: center; padding: 20px; }
.spinner { width: 34px; height: 34px; border-radius: 50%; border: 3px solid var(--border);
  border-top-color: var(--accent); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.status { min-height: 1.2em; color: var(--muted); font-size: .85rem; margin: 10px 0 4px; }
.tip { color: var(--muted); font-size: .8rem; border-top: 1px dashed var(--border);
  padding-top: 10px; margin-bottom: 0; }
.warn-box { background: var(--warn-bg); color: var(--warn); border-radius: 10px;
  padding: 10px 12px; font-size: .82rem; }
.warn-inline { color: var(--warn); font-size: .82rem; margin: 4px 0; }
.note { color: var(--muted); font-size: .8rem; }

/* ------------------------------ buttons --------------------------------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 10px 18px; border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 700;
  cursor: pointer; transition: transform .12s, box-shadow .12s, border-color .12s; }
.btn:hover { transform: translateY(-1px); border-color: var(--accent); }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff;
  box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 35%, transparent); }
.btn.primary:hover { background: var(--accent-2); }
.btn.ghost { background: transparent; }
.actions { display: flex; gap: 10px; margin-top: 10px; }
.actions .btn { flex: 1; }

/* ------------------------------- dialog --------------------------------- */
dialog { border: none; border-radius: var(--radius); background: var(--surface);
  color: var(--text); padding: 22px; max-width: 420px; width: 90%; box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(2, 6, 23, .55); }
#scanVideo { width: 100%; border-radius: 10px; background: #000; aspect-ratio: 4/3; object-fit: cover; }

/* ------------------------------- toast ---------------------------------- */
#toast { position: fixed; bottom: 22px; left: 50%; transform: translate(-50%, 14px);
  background: #111827; color: #fff; padding: 11px 18px; border-radius: 11px;
  font-size: .9rem; opacity: 0; pointer-events: none; transition: .25s; z-index: 100;
  box-shadow: var(--shadow); max-width: 90vw; }
#toast.show { opacity: 1; transform: translate(-50%, 0); }
#toast.err { background: var(--err); }

/* ------------------------------ seo bits -------------------------------- */
.seo { max-width: 780px; margin: 26px auto 40px; padding-inline: 20px; }
.seo h2 { margin-top: 34px; }
.howto li { margin-bottom: 8px; }
.type-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.type-card { background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 16px; }
.type-card h3 { margin: 0 0 4px; font-size: .95rem; }
.type-card p { margin: 0; color: var(--muted); font-size: .85rem; }
.faq details { background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq p { color: var(--muted); margin-bottom: 0; }

/* ------------------------------- footer --------------------------------- */
.site-footer { border-top: 1px solid var(--border); padding: 26px 0 40px;
  color: var(--muted); font-size: .88rem; }
.tools .soon { opacity: .6; }
.noscript { text-align: center; padding: 20px; color: var(--err); }

/* --------------------------- RTL specifics ------------------------------ */
[dir="rtl"] .chev { transform: scaleX(-1); }
[dir="rtl"] input[type="range"] { direction: rtl; }

@media (max-width: 1059px) { .qr-stage { max-width: 360px; margin-inline: auto; width: 100%; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}