/* Trislee Digital – Công cụ ảnh. Dùng chung design token với UTM Builder. */
:root {
  --primary: #1E3A5F; --on-primary: #FFFFFF; --secondary: #2563EB;
  --accent: #047857; --accent-hover: #065F46; --on-accent: #FFFFFF;
  --bg: #F8FAFC; --surface: #FFFFFF; --surface-2: #F1F5F9;
  --fg: #0F172A; --fg-muted: #475569; --fg-subtle: #64748B;
  --border: #E2E8F0; --border-strong: #CBD5E1;
  --danger: #DC2626; --danger-bg: #FEF2F2; --success: #047857; --success-bg: #ECFDF5;
  --warn: #B45309; --warn-bg: #FFFBEB; --info-bg: #EFF6FF; --ring: #2563EB; --code-bg: #F1F5F9;
  --radius-sm: 8px; --radius: 12px; --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px -12px rgba(15, 23, 42, .12);
  --font: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --ease: cubic-bezier(.2, .8, .2, 1);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --primary: #93C5FD; --on-primary: #0B1220; --secondary: #60A5FA;
    --accent: #10B981; --accent-hover: #34D399; --on-accent: #052E1F;
    --bg: #0B1220; --surface: #111A2E; --surface-2: #17223A;
    --fg: #E2E8F0; --fg-muted: #A5B4C8; --fg-subtle: #8494AB;
    --border: #22304A; --border-strong: #33445F;
    --danger: #F87171; --danger-bg: #2A1316; --success: #34D399; --success-bg: #0F2A21;
    --warn: #FBBF24; --warn-bg: #2A2110; --info-bg: #13233F; --ring: #60A5FA; --code-bg: #0E1628;
    --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px -12px rgba(0, 0, 0, .5);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --primary: #93C5FD; --on-primary: #0B1220; --secondary: #60A5FA;
  --accent: #10B981; --accent-hover: #34D399; --on-accent: #052E1F;
  --bg: #0B1220; --surface: #111A2E; --surface-2: #17223A;
  --fg: #E2E8F0; --fg-muted: #A5B4C8; --fg-subtle: #8494AB;
  --border: #22304A; --border-strong: #33445F;
  --danger: #F87171; --danger-bg: #2A1316; --success: #34D399; --success-bg: #0F2A21;
  --warn: #FBBF24; --warn-bg: #2A2110; --info-bg: #13233F; --ring: #60A5FA; --code-bg: #0E1628;
  --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px -12px rgba(0, 0, 0, .5);
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.6; color: var(--fg); background: var(--bg); -webkit-font-smoothing: antialiased; }
h1, h2, h3 { line-height: 1.25; margin: 0; letter-spacing: -0.01em; }
a { color: var(--secondary); }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; border-radius: 6px; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .container { padding: 0 24px; } }
.skip-link { position: absolute; left: 16px; top: -48px; z-index: 100; background: var(--primary); color: var(--on-primary); padding: 10px 16px; border-radius: var(--radius-sm); text-decoration: none; transition: top .2s var(--ease); }
.skip-link:focus { top: 12px; }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-weight: 500; }
.brand b { font-weight: 800; color: var(--primary); }
.brand-mark { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 8px; background: #1E3A5F; color: #fff; }
.header-nav { display: flex; align-items: center; gap: 4px; }
.header-nav a { color: var(--fg-muted); text-decoration: none; font-size: 15px; font-weight: 500; padding: 10px 12px; border-radius: var(--radius-sm); min-height: 44px; display: inline-flex; align-items: center; transition: color .15s, background-color .15s; }
.header-nav a:hover { color: var(--fg); background: var(--surface-2); }
@media (max-width: 480px) { .header-nav a { display: none; } }
.icon-btn { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--border); background: var(--surface); border-radius: var(--radius-sm); color: var(--fg-muted); transition: color .15s, border-color .15s; }
.icon-btn:hover { color: var(--fg); border-color: var(--border-strong); }
.icon-btn .i-moon { display: none; }
:root[data-theme="dark"] .icon-btn .i-sun { display: none; }
:root[data-theme="dark"] .icon-btn .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-btn .i-sun { display: none; }
  :root:not([data-theme="light"]) .icon-btn .i-moon { display: block; }
}

/* ---------- Hero ---------- */
.hero { padding: 28px 0 20px; }
@media (min-width: 768px) { .hero { padding: 40px 0 28px; } }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; color: var(--fg-subtle); margin-bottom: 12px; }
.breadcrumb a { color: var(--fg-subtle); text-decoration: none; }
.breadcrumb a:hover { color: var(--secondary); text-decoration: underline; }
.hero h1 { font-size: clamp(1.9rem, 4.5vw, 3rem); font-weight: 800; letter-spacing: -0.03em; }
.hero .hl { color: var(--accent); }
.lead { max-width: 70ch; margin: 12px 0 0; color: var(--fg-muted); font-size: 1.0625rem; }

.tool-nav { display: flex; gap: 8px; margin-top: 20px; overflow-x: auto; padding-bottom: 4px; scrollbar-width: thin; }
.tool-nav a { flex: none; display: inline-flex; align-items: center; min-height: 40px; padding: 8px 14px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); color: var(--fg-muted); text-decoration: none; font-size: 14px; font-weight: 500; transition: color .15s, border-color .15s, background-color .15s; }
.tool-nav a:hover { color: var(--fg); border-color: var(--border-strong); }
.tool-nav a[aria-current="page"] { background: #1E3A5F; border-color: #1E3A5F; color: #fff; }
@media (pointer: coarse) { .tool-nav a { min-height: 44px; } }

/* ---------- Workspace ---------- */
.workspace { display: grid; gap: 20px; align-items: start; padding-bottom: 48px; }
@media (min-width: 1024px) {
  .workspace { grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; }
  .settings { position: sticky; top: 80px; }
}
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 16px; min-width: 0; }
@media (min-width: 768px) { .card { padding: 20px; } }

.dropzone {
  position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  min-height: 240px; padding: 28px 16px; text-align: center; cursor: pointer;
  border: 2px dashed var(--border-strong); border-radius: var(--radius); background: var(--surface-2);
  transition: border-color .15s, background-color .15s;
}
.dropzone:hover, .dropzone.is-over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, var(--surface-2)); }
.dropzone:focus-within { outline: 3px solid var(--ring); outline-offset: 2px; }
.dropzone input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.has-files .dropzone { min-height: 120px; padding: 18px 16px; }
.has-files .dz-icon { width: 40px; height: 40px; }
.dz-icon { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 50%; background: var(--accent); color: var(--on-accent); margin-bottom: 6px; transition: width .2s, height .2s; }
.dz-icon svg { width: 24px; height: 24px; }
.dz-title { font-weight: 700; font-size: 1.0625rem; }
.dz-title u { color: var(--accent); text-underline-offset: 3px; }
.dz-sub { font-size: 14px; color: var(--fg-subtle); }
.dz-privacy { display: inline-flex; align-items: center; gap: 6px; margin-top: 6px; font-size: 13px; color: var(--success); font-weight: 500; }
.dz-privacy svg { width: 14px; height: 14px; }
.has-files .dz-privacy { display: none; }

.list-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin: 16px 0 8px; }
.summary { margin: 0; font-size: 14.5px; color: var(--fg-muted); }
.summary b { color: var(--success); }
.list-actions { display: flex; gap: 8px; }

.file-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.file {
  display: grid; grid-template-columns: 56px minmax(0, 1fr) auto; gap: 12px; align-items: center;
  padding: 10px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  animation: slideIn .25s var(--ease);
}
.thumb { width: 56px; height: 56px; border-radius: var(--radius-sm); object-fit: cover; background: var(--surface-2) repeating-conic-gradient(var(--border) 0 25%, transparent 0 50%) 0 0 / 12px 12px; }
.thumb-ph { display: grid; place-items: center; font-size: 11px; font-weight: 700; color: var(--fg-subtle); background: var(--surface-2); letter-spacing: .04em; }
.f-name { font-weight: 600; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.f-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-size: 13px; color: var(--fg-subtle); font-variant-numeric: tabular-nums; }
.f-meta .arrow { color: var(--fg-subtle); }
.f-meta .new { color: var(--fg); font-weight: 600; }
.badge { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.badge.good { background: var(--success-bg); color: var(--success); }
.badge.bad { background: var(--warn-bg); color: var(--warn); }
.badge.err { background: var(--danger-bg); color: var(--danger); }
.f-actions { display: flex; gap: 4px; align-items: center; }
.f-actions .btn-icon { display: grid; place-items: center; width: 40px; height: 40px; border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--fg-subtle); transition: color .15s, background-color .15s; }
.f-actions .btn-icon:hover { color: var(--danger); background: var(--danger-bg); }
@media (pointer: coarse) { .f-actions .btn-icon { width: 44px; height: 44px; } }
.spinner { width: 20px; height: 20px; border: 2.5px solid var(--border-strong); border-top-color: var(--accent); border-radius: 50%; animation: spin .7s linear infinite; margin: 0 10px; }
@media (max-width: 520px) {
  .file { grid-template-columns: 48px minmax(0, 1fr); }
  .thumb { width: 48px; height: 48px; }
  .f-actions { grid-column: 1 / -1; justify-content: flex-end; }
  .f-actions .btn-dl { flex: 1; }
}

/* ---------- Settings ---------- */
.settings h2 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 16px; }
.field { margin: 0 0 18px; min-width: 0; border: 0; padding: 0; }
.field label, .field legend { display: block; font-weight: 600; font-size: 14.5px; margin-bottom: 6px; padding: 0; }
.label-row { display: flex; justify-content: space-between; align-items: baseline; }
.label-row output { font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }
select, input[type="number"] { width: 100%; min-height: 44px; padding: 8px 12px; background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); font-size: 16px; transition: border-color .15s, box-shadow .15s; }
select:hover, input[type="number"]:hover { border-color: var(--fg-subtle); }
select:focus, input[type="number"]:focus { outline: none; border-color: var(--ring); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ring) 25%, transparent); }
input[type="range"] { width: 100%; accent-color: var(--accent); height: 32px; margin: 0; cursor: pointer; }
.range-hint { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--fg-subtle); }
.help { margin: 6px 0 0; font-size: 13px; color: var(--fg-subtle); line-height: 1.5; }
.color-row { display: flex; align-items: center; gap: 10px; }
.color-row input { width: 48px; height: 40px; padding: 2px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface); cursor: pointer; }
.color-row span { font-size: 14px; color: var(--fg-muted); font-variant-numeric: tabular-nums; }
.resize-value { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
.resize-value .unit { font-size: 14px; color: var(--fg-muted); min-width: 22px; }
.size-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chip { min-height: 32px; padding: 4px 10px; font-size: 13px; font-weight: 500; border: 1px solid var(--border); background: var(--surface-2); color: var(--fg-muted); border-radius: 999px; transition: color .15s, border-color .15s; font-variant-numeric: tabular-nums; }
.chip:hover { color: var(--fg); border-color: var(--border-strong); }
.chip[aria-pressed="true"] { background: var(--info-bg); border-color: var(--secondary); color: var(--secondary); }
@media (pointer: coarse) { .chip { min-height: 44px; padding: 4px 14px; } }
.check:not([hidden]) { display: flex !important; align-items: center; gap: 8px; font-weight: 500 !important; font-size: 14px !important; margin-top: 10px; min-height: 36px; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.note { margin: 0; font-size: 13px; color: var(--fg-muted); background: var(--info-bg); padding: 10px 12px; border-radius: var(--radius-sm); }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 8px 16px; border-radius: var(--radius-sm); font-weight: 600; font-size: 15px; text-decoration: none; border: 1px solid transparent; transition: background-color .15s, border-color .15s, color .15s, transform .1s, opacity .15s; touch-action: manipulation; white-space: nowrap; }
.btn:active:not(:disabled) { transform: scale(.98); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-secondary { background: var(--surface); border-color: var(--border-strong); color: var(--fg); }
.btn-secondary:hover { border-color: var(--fg-subtle); background: var(--surface-2); }
.btn-ghost { background: transparent; color: var(--fg-muted); }
.btn-ghost:hover { color: var(--fg); background: var(--surface-2); }
.btn-sm { min-height: 40px; padding: 6px 12px; font-size: 14px; font-weight: 500; }
.btn-sm svg { width: 16px; height: 16px; }
@media (pointer: coarse) { .btn-sm { min-height: 44px; } }

/* ---------- Content ---------- */
.content { max-width: 820px; padding-top: 8px; padding-bottom: 64px; }
.content section { padding: 32px 0; border-top: 1px solid var(--border); }
.content h2 { font-size: clamp(1.35rem, 2.6vw, 1.6rem); font-weight: 700; margin-bottom: 14px; }
.content p { margin: 0 0 14px; color: var(--fg-muted); }
.content strong { color: var(--fg); }
.steps { margin: 0; padding-left: 22px; display: grid; gap: 10px; color: var(--fg-muted); }
.steps li::marker { color: var(--accent); font-weight: 700; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.data-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.data-table th, .data-table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.data-table th { font-weight: 600; background: var(--surface-2); font-size: 13.5px; color: var(--fg-muted); white-space: nowrap; }
.data-table tr:last-child td { border-bottom: 0; }
.data-table td { color: var(--fg-muted); }
.data-table td:first-child { color: var(--fg); }
.faq { display: grid; gap: 8px; }
.faq details { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 14px 16px; min-height: 52px; font-weight: 600; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; width: 10px; height: 10px; flex: none; margin-right: 4px; border-right: 2px solid var(--fg-subtle); border-bottom: 2px solid var(--fg-subtle); transform: rotate(45deg) translateY(-3px); transition: transform .2s var(--ease); }
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-3px); }
.faq details p { padding: 0 16px 16px; margin: 0; }
.related-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.related-grid a { display: block; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--fg); transition: border-color .15s, transform .15s var(--ease); }
.related-grid a:hover { border-color: var(--accent); transform: translateY(-2px); }
.related-grid b { display: block; font-weight: 700; }
.related-grid span { display: block; font-size: 13.5px; color: var(--fg-subtle); margin-top: 2px; }

/* ---------- Footer & toast ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 24px 0; font-size: 14px; color: var(--fg-subtle); }
.site-footer p { margin: 0; }
.site-footer a { color: var(--fg-muted); }
.toast { position: fixed; left: 50%; bottom: 24px; z-index: 50; transform: translate(-50%, 16px); opacity: 0; pointer-events: none; background: var(--fg); color: var(--bg); font-weight: 500; font-size: 14.5px; padding: 12px 18px; border-radius: var(--radius-sm); box-shadow: var(--shadow); transition: opacity .2s var(--ease), transform .2s var(--ease); max-width: calc(100vw - 32px); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@keyframes slideIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .spinner { animation: spin 1.5s linear infinite !important; }
}