/* ============================================
   Pixia - Scanned Document Enhancer
   (loaded only on scan-enhancer.html)
   Complements css/ai-tool.css (.at-* primitives)
   Scope: body.at-scan
   Accent: sky / blue
   ============================================ */

body.at-scan {
    --sc-accent: #0ea5e9;
    --sc-accent-2: #38bdf8;
    --sc-accent-ink: #ffffff;
    --sc-shadow: 0 16px 34px -18px rgba(14, 165, 233, .6);
}

body.at-scan [hidden] { display: none !important; }

/* The tool root stacks vertically; the two-column workspace lives in .sc-layout */
body.at-scan .at-tool { grid-template-columns: minmax(0, 1fr); }
body.at-scan .at-tool > .at-panel + .at-panel,
body.at-scan .at-tool > .sc-layout { margin-block-start: 0; }

body.at-scan .at-kicker {
    background: linear-gradient(135deg, #0ea5e9, #38bdf8);
    color: #ffffff;
}
body.at-scan .at-btn {
    background: linear-gradient(135deg, #0ea5e9, #38bdf8);
    color: #ffffff;
    box-shadow: var(--sc-shadow);
}
body.at-scan .at-btn-alt {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    box-shadow: none;
}
body.at-scan .at-btn:disabled,
body.at-scan .at-btn-alt:disabled { opacity: .5; cursor: not-allowed; }
body.at-scan .at-step-num { background: color-mix(in srgb, var(--sc-accent) 18%, transparent); }
body.at-scan .at-progress-fill { background: linear-gradient(90deg, var(--sc-accent), var(--sc-accent-2)); }

/* ---------- Layout ---------- */
body.at-scan .sc-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 20px;
    align-items: start;
}

.sc-main,
.sc-right {
    min-width: 0;
    display: grid;
    gap: 16px;
    align-content: start;
}

.sc-main {
    position: sticky;
    inset-block-start: 84px;
    align-self: start;
}

body.at-scan .at-panel { min-height: 0; min-width: 0; }
.sc-main .at-panel + .at-panel,
.sc-right .at-panel + .at-panel { margin-block-start: 0; }

.sc-panel h2 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 12px;
    font-family: var(--font-display);
    font-size: 1.02rem;
    letter-spacing: -.015em;
}
.sc-panel-hint {
    margin: -4px 0 12px;
    font-size: 12.5px;
    line-height: 1.55;
    color: var(--text-tertiary);
}

/* ---------- Dropzone ---------- */
.sc-drop {
    display: grid;
    place-items: center;
    gap: 8px;
    text-align: center;
    padding: 26px 16px;
    border-radius: var(--at-radius-lg, 18px);
    border: 1.5px dashed var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-tertiary);
    font-size: 13px;
    line-height: 1.6;
    cursor: pointer;
    transition: border-color .15s, background .15s;
}
.sc-drop:hover,
.sc-drop.is-dragover {
    border-color: var(--sc-accent);
    background: color-mix(in srgb, var(--sc-accent) 8%, var(--glass-bg));
    color: var(--sc-accent);
}
.sc-drop svg { width: 34px; height: 34px; }
.sc-drop strong { font-weight: 700; color: var(--text-secondary); display: block; font-size: 14px; }
.sc-drop em { font-style: normal; font-size: 12px; opacity: .85; }

.sc-btn-grid { margin-block-start: 12px; display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.sc-btn-grid .at-btn { width: 100%; padding: 12px 14px; font-size: 14px; }

/* ---------- Preview stage ---------- */
.sc-stage-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-block-end: 12px; flex-wrap: wrap; }
.sc-stage-head h2 { margin: 0; }

.sc-tabs { display: flex; gap: 4px; padding: 3px; border-radius: 999px; border: 1px solid var(--glass-border); background: var(--glass-bg); }
.sc-tabs button {
    padding: 7px 16px;
    border: 0; border-radius: 999px;
    background: transparent;
    color: var(--text-secondary);
    font: 600 12.5px/1 var(--font-primary);
    cursor: pointer;
    transition: color .15s, background .15s;
}
.sc-tabs button.is-active { background: var(--bg-card-hover); color: var(--text-primary); }
.sc-tabs button:disabled { opacity: .4; cursor: not-allowed; }

.sc-viewport {
    position: relative;
    min-height: 460px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    border-radius: var(--at-radius-lg, 18px);
    border: 1px solid var(--glass-border);
    background: repeating-conic-gradient(rgba(128, 128, 128, .09) 0% 25%, transparent 0% 50%) 50% / 22px 22px;
    overflow: hidden;
}
.sc-empty {
    display: grid;
    place-items: center;
    text-align: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 13px;
    max-width: 30ch;
    line-height: 1.6;
}
.sc-empty svg { width: 60px; height: 60px; opacity: .5; }

.sc-frame { position: relative; display: inline-block; line-height: 0; max-width: 100%; }
.sc-frame[hidden] { display: none !important; }
.sc-img {
    display: block;
    max-width: 100%;
    max-height: 460px;
    border-radius: 6px;
    user-select: none;
    -webkit-user-drag: none;
}

/* ---------- Crop / perspective overlay ---------- */
.sc-overlay {
    position: absolute;
    inset: 0;
    touch-action: none;
    cursor: crosshair;
}
.sc-overlay[hidden] { display: none !important; }
.sc-overlay::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(10, 20, 30, .45);
    pointer-events: none;
    clip-path: polygon(
        0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 0%,
        var(--q1x) var(--q1y), var(--q4x) var(--q4y), var(--q3x) var(--q3y), var(--q2x) var(--q2y), var(--q1x) var(--q1y)
    );
}
.sc-quad { position: absolute; inset: 0; width: 100%; height: 100%; display: block; pointer-events: none; }
.sc-quad line { stroke: var(--sc-accent); stroke-width: 2; vector-effect: non-scaling-stroke; }
.sc-handle {
    position: absolute;
    width: 22px; height: 22px;
    margin: -11px 0 0 -11px;
    border-radius: 50%;
    background: #ffffff;
    border: 2.5px solid var(--sc-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, .35);
    pointer-events: auto;
    cursor: grab;
    touch-action: none;
}
.sc-handle:active { cursor: grabbing; }
.sc-handle.is-edge {
    width: 16px; height: 16px;
    margin: -8px 0 0 -8px;
    border-width: 2px;
    background: var(--sc-accent);
    border-color: #ffffff;
}
.sc-frame:not(.is-cropping) .sc-handle.is-edge { display: none; }

.sc-overlay-tip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-block-start: 10px;
    font-size: 12px;
    color: var(--text-tertiary);
}
.sc-overlay-tip svg { width: 15px; height: 15px; flex: none; }

.sc-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-block-start: 10px;
    font-size: 12.5px;
    color: var(--text-tertiary);
}
.sc-info strong { font-weight: 600; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sc-info span { flex: none; font-variant-numeric: tabular-nums; }

/* ---------- Pages rail ---------- */
.sc-pages { display: flex; gap: 10px; overflow-x: auto; padding: 4px 2px 8px; }
.sc-pages::-webkit-scrollbar { height: 6px; }
.sc-pages::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 99px; }

.sc-page {
    position: relative;
    flex: none;
    width: 84px;
    border-radius: 10px;
    border: 2px solid var(--glass-border);
    background: var(--glass-bg);
    overflow: hidden;
    cursor: pointer;
    transition: border-color .15s;
}
.sc-page:hover { border-color: var(--sc-accent); }
.sc-page.is-active { border-color: var(--sc-accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--sc-accent) 20%, transparent); }
.sc-page-img { width: 100%; height: 108px; object-fit: cover; display: block; background: #fff; }
.sc-page-num {
    position: absolute;
    inset-block-start: 4px;
    inset-inline-start: 4px;
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    display: grid;
    place-items: center;
    border-radius: 6px;
    background: rgba(0, 0, 0, .62);
    color: #fff;
    font-size: 10.5px;
    font-weight: 700;
    line-height: 1;
}
.sc-page-del {
    position: absolute;
    inset-block-start: 3px;
    inset-inline-end: 3px;
    width: 20px; height: 20px;
    display: grid; place-items: center;
    border: 0; border-radius: 6px;
    background: rgba(0, 0, 0, .55);
    color: #fff;
    cursor: pointer;
    padding: 0;
    opacity: 0;
    transition: opacity .15s, background .15s;
}
.sc-page:hover .sc-page-del { opacity: 1; }
.sc-page-del:hover { background: #dc2626; }
.sc-page-del svg { width: 12px; height: 12px; }
.sc-page-busy {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(10, 20, 30, .4);
}
.sc-page-busy span {
    width: 20px; height: 20px;
    border-radius: 50%;
    border: 2.5px solid rgba(255, 255, 255, .35);
    border-top-color: #fff;
    animation: sc-spin .7s linear infinite;
}
@keyframes sc-spin { to { transform: rotate(360deg); } }

/* ---------- Fields / controls ---------- */
.sc-field {margin-block-start: 14px;margin-bottom: 25px;}
.sc-field:first-child { margin-block-start: 0; }

.sc-legend {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: .02em;
    color: var(--text-secondary);
    margin-block-end: 9px;
}
.sc-legend output { font-weight: 600; color: var(--text-tertiary); font-variant-numeric: tabular-nums; }

.sc-range-row { display: flex; align-items: center; gap: 12px; }
.sc-range-row input[type="range"] { flex: 1; accent-color: var(--sc-accent); }
.sc-range-row output { min-width: 42px; text-align: end; font-size: 12.5px; color: var(--text-tertiary); font-variant-numeric: tabular-nums; }

.sc-check { display: flex; align-items: center; gap: 9px; font-size: 13.5px; color: var(--text-secondary); cursor: pointer; }
.sc-check input { accent-color: var(--sc-accent); width: 16px; height: 16px; }

.sc-switch { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--text-secondary); cursor: pointer; }
.sc-switch input { position: absolute; opacity: 0; pointer-events: none; }
.sc-switch i {
    position: relative;
    width: 38px; height: 22px;
    flex: 0 0 auto;
    border-radius: 999px;
    background: var(--bg-secondary);
    transition: background .2s ease;
}
.sc-switch i::after {
    content: "";
    position: absolute;
    inset-block-start: 3px;
    inset-inline-start: 3px;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .3);
    transition: transform .2s ease;
}
.sc-switch input:checked + i { background: var(--sc-accent); }
.sc-switch input:checked + i::after { transform: translateX(16px); }
[dir="rtl"] .sc-switch input:checked + i::after { transform: translateX(-16px); }
.sc-switch input:focus-visible + i { outline: 2px solid var(--sc-accent); outline-offset: 2px; }
.sc-switch input:disabled + i { opacity: .45; }
.sc-switch input:disabled ~ span { opacity: .6; }

.sc-hint { margin: 9px 0 0; font-size: 12px; line-height: 1.55; color: var(--text-muted); }

/* Segmented controls */
.sc-seg { display: flex; gap: 6px; flex-wrap: wrap; }
.sc-seg button {
    flex: 1 1 0;
    min-width: 64px;
    padding: 9px 6px;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    background: var(--glass-bg);
    color: var(--text-secondary);
    font: 600 12.5px/1.15 var(--font-primary);
    cursor: pointer;
    transition: color .15s, border-color .15s, background .15s;
}
.sc-seg button:hover { color: var(--text-primary); }
.sc-seg button.is-active {
    color: var(--sc-accent);
    border-color: var(--sc-accent);
    background: color-mix(in srgb, var(--sc-accent) 10%, var(--glass-bg));
}

/* Geometry tool buttons */
.sc-tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.sc-tool {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 11px 4px;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    background: var(--glass-bg);
    color: var(--text-secondary);
    font: 600 11.5px/1.1 var(--font-primary);
    cursor: pointer;
    text-align: center;
    transition: color .15s, border-color .15s, background .15s;
}
.sc-tool:hover { color: var(--sc-accent); border-color: var(--sc-accent); }
.sc-tool svg { width: 20px; height: 20px; }
.sc-tool-wide { grid-column: 1 / -1; flex-direction: row; justify-content: center; gap: 8px; padding: 11px; }

/* Pages toolbar (inner actions) */
.sc-tools.sc-pages-tools { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-block-end: 12px; }
@media (max-width: 560px) {
    .sc-tools.sc-pages-tools { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- Export / progress ---------- */
.sc-export { display: grid; gap: 12px; }
.sc-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.sc-actions .at-btn { width: 100%; padding: 13px 14px; font-size: 14px; }
.sc-actions .at-btn-wide { grid-column: 1 / -1; }

.sc-progress { display: grid; gap: 8px; }
.sc-progress-bar { height: 6px; border-radius: 99px; background: var(--glass-border); overflow: hidden; }
.sc-progress-fill { height: 100%; width: 0; border-radius: 99px; background: linear-gradient(90deg, var(--sc-accent), var(--sc-accent-2)); transition: width .2s ease; }
.sc-progress-msg { font-size: 12.5px; color: var(--text-tertiary); text-align: center; }

.sc-busy {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: color-mix(in srgb, var(--bg-primary, #fff) 55%, transparent);
    backdrop-filter: blur(1px);
    border-radius: var(--at-radius-lg, 18px);
}
.sc-busy span {
    width: 34px; height: 34px;
    border-radius: 50%;
    border: 3px solid color-mix(in srgb, var(--sc-accent) 30%, transparent);
    border-top-color: var(--sc-accent);
    animation: sc-spin .7s linear infinite;
}

/* ---------- Zoom controls ---------- */
.sc-zoom {
    position: absolute;
    inset-block-end: 12px;
    inset-inline-end: 12px;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: color-mix(in srgb, var(--bg-card, #fff) 82%, transparent);
    backdrop-filter: blur(6px);
    box-shadow: 0 6px 18px -8px rgba(0, 0, 0, .35);
    z-index: 5;
}
.sc-zoom[hidden] { display: none !important; }
.sc-zoom-btn {
    width: 30px; height: 30px;
    display: grid;
    place-items: center;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background .15s, color .15s;
}
.sc-zoom-btn:hover { background: var(--glass-bg); color: var(--sc-accent); }
.sc-zoom-btn svg { width: 16px; height: 16px; }
.sc-zoom-badge {
    min-width: 46px;
    height: 30px;
    padding: 0 8px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--text-secondary);
    font: 600 12px/1 var(--font-primary);
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    transition: background .15s, color .15s;
}
.sc-zoom-badge:hover { background: var(--glass-bg); color: var(--sc-accent); }
.sc-viewport.is-zoomed { cursor: grab; touch-action: none; }
.sc-viewport.is-panning { cursor: grabbing; }
.sc-viewport.is-zoomed .sc-overlay { cursor: grab; }
.sc-viewport.is-panning .sc-overlay { cursor: grabbing; }

/* ---------- AI restore ---------- */
.sc-ai {
    margin-block-start: 14px;
    padding-block-start: 12px;
    border-block-start: 1px dashed var(--glass-border);
}
.sc-ai .sc-check, .sc-ai .sc-switch { margin-block-start: 0; }
.sc-check-ai { font-weight: 600; }
.sc-ai.is-active .sc-check-ai { color: var(--sc-accent); }
.sc-ai.is-unavailable { opacity: .6; }
.sc-ai-note {
    margin: 6px 0 0;
    font-size: 12px;
    line-height: 1.45;
    color: var(--text-secondary);
}
.sc-ai-status { margin-block-start: 10px; }
.sc-ai-msg {
    margin: 6px 0 0;
    font-size: 12px;
    color: var(--text-secondary);
}

/* ---------- Responsive ---------- */
@media (max-width: 1180px) {
    body.at-scan .sc-layout { grid-template-columns: minmax(0, 1fr) 330px; }
}

@media (max-width: 980px) {
    body.at-scan .sc-layout { grid-template-columns: 1fr; }
    .sc-main { position: static; order: 1; }
    .sc-right { order: 2; }
    .sc-viewport { min-height: 320px; }
    .sc-img { max-height: 320px; }
}