:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --soft: #f1f5f9;
  --primary: #2563eb;
  --primary-fg: #ffffff;
  --good: #16a34a;
  --warn: #d97706;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --border: #1e293b;
    --soft: #111827;
    --primary: #3b82f6;
    --good: #4ade80;
    --warn: #fbbf24;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 32px 16px 48px; display: grid; gap: 20px; }
.content { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
h1 { margin: 0; font-size: 26px; line-height: 1.25; }
a { color: var(--primary); }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.top p { margin: 4px 0 0; }
.top-actions { display: flex; gap: 4px; flex-shrink: 0; }
button, select, .ghost { font: inherit; color: inherit; cursor: pointer; }
.ghost {
  background: none; border: 0; border-radius: 999px; padding: 6px 10px;
  font-size: 13px; font-weight: 600; text-decoration: none; color: var(--fg);
}
.ghost:hover { background: var(--soft); }
.drop {
  width: 100%; display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center;
  padding: 36px 16px; border: 2px dashed var(--border); border-radius: 14px; background: none;
  transition: background .15s, border-color .15s;
}
.drop svg { color: var(--muted); }
.drop:hover, .drop.over { background: var(--soft); border-color: var(--primary); }
.panel { border: 1px solid var(--border); border-radius: 14px; padding: 16px; }
.settings { display: grid; gap: 14px; }
@media (max-width: 640px) { .settings { grid-template-columns: 1fr; } }
.field { display: grid; gap: 6px; }
.label { font-size: 12.5px; color: var(--muted); }
.label b { color: var(--fg); }
.seg { display: flex; gap: 4px; }
.seg button {
  flex: 1; padding: 6px 4px; border: 1px solid var(--border); border-radius: 8px; background: none;
  font-size: 12px; font-weight: 600;
}
.seg button.active { background: var(--primary); border-color: var(--primary); color: var(--primary-fg); }
input[type="range"] { width: 100%; accent-color: var(--primary); }
input[type="range"]:disabled { opacity: .4; }
select { width: 100%; padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); }
.bar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; }
.bar p { margin: 0; }
.actions { display: flex; gap: 8px; }
.primary, .outline {
  height: 32px; padding: 0 12px; border-radius: 8px; font-size: 13px; font-weight: 600; border: 1px solid var(--primary);
}
.primary { background: var(--primary); color: var(--primary-fg); }
.outline { background: none; border-color: var(--border); }
.primary:disabled, .outline:disabled { opacity: .5; cursor: default; }
.good { color: var(--good); }
.warn { color: var(--warn); }
#list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }
#list li { display: flex; align-items: center; gap: 12px; border: 1px solid var(--border); border-radius: 12px; padding: 8px; }
#list img { width: 56px; height: 56px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); flex-shrink: 0; }
#list .info { flex: 1; min-width: 0; font-size: 13.5px; }
#list .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#list .meta { font-size: 12.5px; color: var(--muted); }
footer { text-align: center; padding-top: 8px; }

/* List */
.row-actions { display: flex; gap: 6px; flex-shrink: 0; }
.icon { width: 30px; height: 30px; border: 1px solid var(--border); border-radius: 8px; background: none; color: var(--muted); }
.icon:hover { color: var(--warn); }

[hidden] { display: none !important; }

/* List actions: same-size buttons on one row */
.row-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.btn-sm {
  height: 32px; min-width: 32px; padding: 0 12px; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--border); border-radius: 8px; background: none; font-size: 13px; font-weight: 600;
}
.btn-sm:hover:not(:disabled) { background: var(--soft); }
.btn-sm:disabled { opacity: .5; cursor: default; }
.btn-icon { width: 32px; padding: 0; color: var(--muted); font-size: 14px; }
.btn-icon:hover { color: var(--warn); }
@media (max-width: 640px) {
  .btn-sm span { display: none; }
  .btn-sm { padding: 0; width: 32px; }
}

/* Convert bar */
.convert { display: grid; gap: 10px; border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; }
.convert .seg { max-width: 420px; }
.convert .seg button { padding: 8px 4px; font-size: 13px; }
.convert #quality { max-width: 520px; }
.drop { padding: 48px 16px; }
.seg button:disabled { opacity: .4; cursor: not-allowed; }

/* Brand */
.top { align-items: center; }
.brand { flex-shrink: 0; display: block; line-height: 0; }
.top-text { flex: 1; min-width: 0; }

/* File type badge */
.badge {
  width: 48px; height: 48px; flex-shrink: 0; display: grid; place-items: center; border-radius: 10px;
  font-size: 11px; font-weight: 800; letter-spacing: .02em; color: #fff; background: #64748b;
}
.badge.pdf { background: #dc2626; }
.badge.docx { background: #2563eb; }
.badge.pptx { background: #ea580c; }
.badge.xlsx { background: #16a34a; }
.note { margin: 0; }

/* How it works */
.howto { border: 1px solid var(--border); border-radius: 14px; padding: 0 16px; font-size: 14px; }
.howto summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
.howto[open] summary { border-bottom: 1px solid var(--border); margin-bottom: 4px; }
.howto ol { padding-left: 20px; margin: 10px 0; }
.howto li { margin: 4px 0; }
.howto p { margin: 8px 0 12px; color: var(--muted); }
.howto p b { color: var(--fg); }
html[lang="vi"] .howto[lang="en"], html[lang="en"] .howto[lang="vi"] { display: none; }
.badge.docm { background: #2563eb; }
.badge.pptm { background: #ea580c; }
.badge.xlsm { background: #16a34a; }
.badge.odt { background: #0369a1; }
.badge.ods { background: #15803d; }
.badge.odp { background: #c2410c; }
.badge.epub { background: #7c3aed; }
.badge.jpg, .badge.jpeg, .badge.png, .badge.webp { background: #0891b2; }

/* Container like Tailwind's: full width with breakpoint max-widths */
.wrap { width: 100%; max-width: 1280px; padding: 32px 16px 48px; }
@media (min-width: 640px) { .wrap { padding-left: 24px; padding-right: 24px; gap: 40px; } }
@media (min-width: 1024px) { .wrap { padding-left: 32px; padding-right: 32px; gap: 60px; } }
kbd { font: 600 11.5px ui-monospace, monospace; padding: 1px 5px; border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; background: var(--soft); color: var(--fg); }

/* QR generator */
.qr-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 900px) { .qr-grid { grid-template-columns: minmax(0, 1fr) 360px; align-items: start; } }
.field { display: grid; gap: 6px; }
.field label { font-size: 12.5px; color: var(--muted); }
.field input, .field select, .field textarea {
  width: 100%; height: 38px; padding: 0 10px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--fg); font: inherit; font-size: 14px;
}
.field textarea { height: 96px; padding: 8px 10px; resize: vertical; }
.row2 { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .row2 { grid-template-columns: 1fr 1fr; } }
.form { display: grid; gap: 12px; }
.seg-wrap { flex-wrap: wrap; }
.seg-wrap button { flex: 1 0 auto; padding: 8px 12px; font-size: 13px; }
.preview { display: grid; gap: 12px; justify-items: center; position: sticky; top: 16px; }
.preview canvas { width: 100%; max-width: 320px; height: auto; border-radius: 12px; border: 1px solid var(--border); background: #fff; }
.preview .actions { width: 100%; max-width: 320px; }
.preview .actions button { flex: 1; }
.colors { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.colors label { display: flex; gap: 6px; align-items: center; font-size: 13px; }
.colors input[type="color"] { width: 32px; height: 32px; padding: 0; border: 1px solid var(--border); border-radius: 8px; background: none; }
.check-row { display: flex; gap: 8px; align-items: center; font-size: 13px; }
.warn-text { color: var(--warn); font-size: 12.5px; min-height: 1em; text-align: center; }

/* Header: back link + mobile layout */
.top-actions { align-items: center; }
.back { color: var(--primary); }
@media (max-width: 640px) {
  .top { flex-wrap: wrap; align-items: flex-start; gap: 10px 12px; }
  .top-actions { order: -1; width: 100%; justify-content: flex-end; margin: -8px -10px 0 0; }
  .top-actions .back { margin-right: auto; margin-left: -10px; }
  .brand img { width: 36px; height: 36px; }
  h1 { font-size: 22px; }
  .top p { font-size: 13.5px; }
}

/* Select: own chevron icon (inline SVG), same look as inputs */
.select { position: relative; display: block; }
.select select { appearance: none; -webkit-appearance: none; cursor: pointer; padding-right: 38px; }
.select .chev {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%); pointer-events: none;
  color: var(--muted); transition: transform .15s, color .15s;
}
.select:hover .chev, .select select:focus + .chev { color: var(--primary); }
.select select:focus + .chev { transform: translateY(-50%) rotate(180deg); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent); }
.field select:hover, .field input:hover { border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.field select option { background: var(--bg); color: var(--fg); }

/* Option buttons: regular text weight */
.seg button, .seg button b, .seg-q b { font-weight: 400; }

/* Header: title only */
.top p[data-i18n="subtitle"] { display: none; }
.top { align-items: center; }

/* Minimal font weights: regular text everywhere, medium only for the title */
strong, b, button, .ghost, .primary, .outline, .btn-sm, .seg button, .seg button b,
summary, .howto summary, #list .name, .file-row .name, .page, label, .label b, #detected b { font-weight: 400; }
h1 { font-weight: 600; }
.badge { font-weight: 600; }

/* Style row: color chips + logo switch */
.colors { gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 10px; height: 44px; padding: 0 12px 0 6px;
  border: 1px solid var(--border); border-radius: 10px; background: var(--bg); cursor: pointer; font-size: 13px;
}
.chip:hover { border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.color-chip input[type="color"] {
  width: 32px; height: 32px; padding: 0; border: 0; border-radius: 7px; background: none; cursor: pointer;
}
.color-chip input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-chip input[type="color"]::-webkit-color-swatch { border: 1px solid var(--border); border-radius: 7px; }
.color-chip input[type="color"]::-moz-color-swatch { border: 1px solid var(--border); border-radius: 7px; }
.chip-text { display: grid; line-height: 1.2; }
.chip-text code { font: 11.5px ui-monospace, monospace; color: var(--muted); }
.switch { padding: 0 12px; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch .track {
  position: relative; width: 34px; height: 20px; border-radius: 999px; background: var(--border); transition: background .15s; flex-shrink: 0;
}
.switch .track::after {
  content: ""; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 999px; background: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,.25); transition: transform .15s;
}
.switch input:checked + .track { background: var(--primary); }
.switch input:checked + .track::after { transform: translateX(14px); }
.switch input:focus-visible + .track { outline: 2px solid var(--primary); outline-offset: 2px; }
#pickLogo { height: 44px; border-radius: 10px; }

/* Mobile: 16px form text so iOS does not zoom in on focus */
@media (max-width: 640px) {
  input, select, textarea { font-size: 16px !important; }
}

/* Phones: one compact header bar across the full width, stuck to the top (same in every tool) */
@media (max-width: 639px) {
  .wrap { padding-top: 0; }
  .top { position: sticky; top: 0; z-index: 10; flex-wrap: nowrap; align-items: center; gap: 10px; margin: 0 -16px; padding: 10px 16px;
    background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
  .top-text { flex: 1; min-width: 0; }
  .brand img { width: 32px; height: 32px; }
  h1 { font-size: 18px; line-height: 1.3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .back { padding: 6px 8px; font-size: 16px; }
  .back span { display: none; }
  .top-actions { order: 0; width: auto; flex: none; gap: 0; margin: 0; }
  .top-actions .back { margin: 0; }
  .top-actions .ghost { padding: 6px 8px; }
}