/* TLC RF Calculator — self-contained stylesheet (no external fonts/frameworks). */

:root {
    --primary: #2f6fed;
    --primary-dark: #2657c0;
    --primary-soft: #eaf1fe;
    --teal: #2bb3c0;
    --green: #2f9e57;
    --orange: #e08a2b;
    --red: #d1495b;

    --bg: #f4f6fa;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e3e8ef;
    --text: #1b2430;
    --text-muted: #667085;

    --radius: 10px;
    --radius-sm: 7px;
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
    --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
    --shadow-lg: 0 12px 32px rgba(16, 24, 40, 0.16);
    --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Dark palette. Applied when the OS prefers dark and the user hasn't chosen
   explicitly, OR when explicitly selected via the toggle (data-theme="dark").
   The media query excludes an explicit "light" choice so the toggle always
   wins over the system preference. */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary-soft: #16233b;
        --bg: #0f141b;
        --surface: #161c24;
        --surface-2: #1b222c;
        --border: #2a333f;
        --text: #e6ebf2;
        --text-muted: #98a2b3;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
        --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);
    }
}
:root[data-theme="dark"] {
    --primary-soft: #16233b;
    --bg: #0f141b;
    --surface: #161c24;
    --surface-2: #1b222c;
    --border: #2a333f;
    --text: #e6ebf2;
    --text-muted: #98a2b3;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.main-container {
    max-width: 1280px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.header {
    position: relative;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 1.5rem 2rem;
}
.header h1 { margin: 0; font-size: 1.5rem; font-weight: 650; letter-spacing: -0.02em; }
.header p { margin: 0.25rem 0 0; opacity: 0.85; font-size: 0.9rem; }
.header-actions {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.version-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.18);
    color: #fff;
}
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.18);
    color: #fff;
    cursor: pointer;
    transition: background 0.15s ease;
}
.theme-toggle:hover { background: rgba(255, 255, 255, 0.3); }
.theme-toggle .icon { width: 18px; height: 18px; }

.content-wrapper { padding: 1.5rem; }

.lab-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.25rem;
    overflow: hidden;
}
.card-header {
    padding: 0.9rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface-2);
}
.card-title { margin: 0; font-size: 1rem; font-weight: 600; }
.card-content { padding: 1.25rem; }

/* fill/stroke are set here because they must cross the <use> shadow boundary
   (presentation attributes on the sprite's <g> do not carry into <use>). */
.icon {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.icon-lg { width: 40px; height: 40px; }

/* Buttons */
.lab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 550;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s, transform 0.05s;
    min-height: 40px;
}
.lab-btn:hover { box-shadow: var(--shadow-sm); }
.lab-btn:active { transform: translateY(1px); }
.lab-btn.active { box-shadow: 0 0 0 2px var(--primary-soft), 0 0 0 3px var(--primary); }

.btn-lab-primary { background: var(--primary); color: #fff; }
.btn-lab-primary:hover { background: var(--primary-dark); }
.btn-lab-secondary { background: var(--teal); color: #fff; }
.btn-lab-success { background: var(--green); color: #fff; }
.btn-lab-warning { background: var(--orange); color: #fff; }
.btn-lab-danger { background: var(--red); color: #fff; }
.btn-lab-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-lab-outline:hover { background: var(--primary-soft); }

.button-group { display: flex; flex-direction: column; gap: 0.6rem; width: 100%; }
.check-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.75rem 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
}
.check-row input { cursor: pointer; }

.num-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.num-row input {
    width: 4.5rem;
    padding: 0.25rem 0.4rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font: inherit;
}

/* Upload area */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    background: var(--surface-2);
    transition: border-color 0.15s, background 0.15s;
}
.upload-area.dragover { border-color: var(--primary); background: var(--primary-soft); }
.upload-area h6 { margin: 0.75rem 0 0.25rem; }
.upload-area p { color: var(--text-muted); margin: 0 0 1.25rem; }
.muted { color: var(--text-muted); }

/* Layout grid */
.images-grid {
    display: grid;
    grid-template-columns: 1fr minmax(240px, 300px) 1fr;
    gap: 1.25rem;
    align-items: start;
}
.image-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
}
.image-title {
    font-size: 0.95rem;
    font-weight: 600;
    text-align: center;
    margin: 0 0 0.9rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}
#canvas-container { position: relative; display: flex; justify-content: center; }
#image-canvas, #annotated-image {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    max-width: 100%;
    box-shadow: var(--shadow-sm);
}
#annotated-image { margin: 0 auto; }
#annotated-image.stale { opacity: 0.45; filter: grayscale(0.3); }
/* Let pointer drags reach the canvas on touch devices (no scroll/zoom steal). */
#image-canvas { touch-action: none; }

/* "Results out of date" banner + pulsing Calculate RF while stale. */
.stale-banner {
    display: none;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 0.75rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    color: #92400e;
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: var(--radius-sm);
}
.stale-banner.show { display: flex; }
.stale-banner .icon { width: 16px; height: 16px; flex: none; }
@media (prefers-color-scheme: dark) {
    .stale-banner { color: #fde68a; background: rgba(180, 83, 9, 0.22); border-color: #b45309; }
}
:root[data-theme="dark"] .stale-banner {
    color: #fde68a; background: rgba(180, 83, 9, 0.22); border-color: #b45309;
}
.lab-btn.pulse { animation: btn-pulse 1.4s ease-in-out infinite; }
@keyframes btn-pulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--green); }
    50% { box-shadow: 0 0 0 4px rgba(34, 139, 34, 0); }
}

.controls-panel {
    background: var(--surface);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.controls-title {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 650;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary);
    text-align: center;
}

/* Instructions */
.instructions-panel {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius-sm);
    padding: 1.1rem 1.25rem;
}
.instructions-title { margin: 0 0 0.6rem; color: var(--primary); font-size: 1rem; display: flex; align-items: center; gap: 0.5rem; }
.instructions-panel ol { padding-left: 1.2rem; margin: 0.5rem 0; }
.instructions-panel li { margin-bottom: 0.4rem; }
.highlight { background: var(--primary-soft); color: var(--primary-dark); padding: 0.05rem 0.35rem; border-radius: 4px; font-weight: 550; }

/* Delete icons on annotations */
.delete-icon {
    position: absolute;
    z-index: 20;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    line-height: 1;
    color: var(--red);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transform: translate(-50%, -50%);
    transition: transform 0.1s;
}
.delete-icon:hover { transform: translate(-50%, -50%) scale(1.15); }

/* Line label popup */
.popup {
    position: absolute;
    display: none;
    z-index: 1000;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    min-width: 240px;
}
.popup input {
    width: 100%;
    padding: 0.6rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
}
.popup input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-soft); }
.popup-actions { display: flex; gap: 0.5rem; }
.popup-actions .lab-btn { flex: 1; }

/* Results table */
.table-container {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}
.table-header { background: var(--primary); color: #fff; padding: 0.9rem 1.25rem; }
.table-title { margin: 0; font-size: 1rem; font-weight: 600; }
#values-table { width: 100%; border-collapse: collapse; min-width: 480px; }
#values-table th {
    background: var(--surface-2);
    text-align: left;
    padding: 0.75rem 0.9rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
#values-table td { padding: 0.75rem 0.9rem; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
#values-table tbody tr:hover { background: var(--surface-2); }

.status-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
}
.status-active { background: rgba(47, 158, 87, 0.15); color: var(--green); }

/* Floating action buttons */
.fab-container { position: fixed; bottom: 1.5rem; right: 1.5rem; display: flex; flex-direction: column; gap: 0.6rem; z-index: 900; }
.lab-fab {
    width: 46px;
    height: 46px;
    border: none;
    border-radius: 50%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform 0.12s, box-shadow 0.12s;
}
.lab-fab:hover { transform: scale(1.08); box-shadow: var(--shadow-lg); }
.fab-lab-primary { background: var(--primary); }
.fab-lab-secondary { background: var(--teal); }
.fab-lab-warning { background: var(--orange); }

/* Toasts */
#toast-container { position: fixed; bottom: 1.25rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 0.5rem; z-index: 2000; align-items: center; }
.toast {
    background: #1b2430;
    color: #fff;
    padding: 0.7rem 1.1rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    opacity: 1;
    transition: opacity 0.35s, transform 0.35s;
    max-width: 90vw;
}
.toast-hide { opacity: 0; transform: translateY(8px); }
.toast-success { background: var(--green); }
.toast-warning { background: var(--orange); }
.toast-error { background: var(--red); }

/* Busy overlay */
#busy-overlay {
    position: fixed;
    inset: 0;
    z-index: 2500;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    background: rgba(15, 20, 27, 0.55);
    color: #fff;
    backdrop-filter: blur(2px);
}
.spinner {
    width: 42px;
    height: 42px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 1024px) {
    .images-grid { grid-template-columns: 1fr; }
    .controls-panel { order: -1; }
}
@media (max-width: 640px) {
    body { padding: 10px; }
    .content-wrapper { padding: 1rem; }
    .fab-container { top: auto; bottom: 1rem; right: 1rem; }
}

/* --- Utility classes (replace former inline style attributes; CSP-strict) - */
.icon-sprite { position: absolute; }
.button-group--row { flex-direction: row; }
.flex-1 { flex: 1; }
.hidden { display: none; }
.text-sm { font-size: 0.85rem; }
.center-mt { text-align: center; margin-top: 1rem; }
.full-width { width: 100%; }
#local-upload-section { margin-top: 1.25rem; }

/* ===== Redesigned layout (v2 UI) ===================================== */

/* Collapsible image source */
.source-summary {
    display: none; align-items: center; justify-content: space-between;
    width: 100%; padding: 0.6rem 1rem;
    background: var(--surface); color: var(--text);
    border-radius: var(--radius); font: inherit;
}
.source-summary.shown { display: flex; }
.source-summary-actions { display: inline-flex; align-items: center; gap: 0.5rem; }
.source-rotate { padding: 0.35rem 0.5rem; }
.source-summary-change {
    display: inline-flex; align-items: center; gap: 0.35rem;
    padding: 0.35rem 0.5rem; background: none; border: none; cursor: pointer;
    color: var(--primary); font-weight: 600; font-size: 0.85rem;
}
.source-summary-change:hover { text-decoration: underline; }
.source-summary .icon { width: 16px; height: 16px; }

/* Toolbar */
.toolbar {
    display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 0.9rem;
    padding: 0.7rem 0.9rem; margin-bottom: 1rem;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow-sm);
    position: sticky; top: 0; z-index: 50;
}
.tool-group { display: flex; align-items: center; gap: 0.4rem; }
/* Two auto margins split the free space, centring undo/redo between the Labels
   group (left) and the actions group (right) on the third ribbon. */
.tool-group--center { margin-left: auto; }
.tool-group--actions { margin-left: auto; }
/* Force three fixed ribbons: Bounds / Annotate / Labels + actions. */
.toolbar-break { flex-basis: 100%; height: 0; margin: 0; }
.tool-label { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted); }
/* Thin sub-divider inside a tool group (e.g. Plate/crop | Min/Max). */
.tool-divider { align-self: stretch; width: 1px; min-height: 1.4rem; margin: 0 0.2rem; background: var(--border); }
.toolbar .lab-btn { padding: 0.42rem 0.7rem; font-size: 0.8rem; }
.toolbar .lab-btn .icon { width: 15px; height: 15px; }
.lab-btn[disabled] { opacity: 0.45; cursor: not-allowed; pointer-events: none; }

/* Contextual hint */
.hint {
    display: none; margin-bottom: 1rem; padding: 0.6rem 0.9rem;
    background: var(--primary-soft); color: var(--primary-dark);
    border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.88rem;
}
.hint.show { display: block; }

/* Work area (orientation-aware) */
.work-area { display: grid; gap: 1.25rem; align-items: start; }
.work-area.layout-columns { grid-template-columns: 1fr 1fr; }
.work-area.layout-rows { grid-template-columns: 1fr; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow-sm); }
.panel-title { margin: 0 0 0.75rem; font-size: 1rem; font-weight: 600; text-align: center; }
.table-scroll { overflow-x: auto; }
.export-row { display: flex; gap: 0.5rem; margin-top: 1rem; }
.export-row .lab-btn { flex: 1; }

/* Help drawer (modal overlay) */
.help-drawer { position: fixed; inset: 0; z-index: 1200; display: none; align-items: center; justify-content: center; padding: 1rem; background: rgba(0, 0, 0, 0.45); }
.help-drawer.open { display: flex; }
.help-card { width: 100%; max-width: 560px; max-height: 85vh; overflow: auto; padding: 1.25rem 1.5rem; background: var(--surface); color: var(--text); border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.help-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
/* Visible on the light help card (unlike the header's white-on-blue toggle). */
.help-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: none;
    width: 32px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}
.help-close:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.help-close .icon { width: 18px; height: 18px; }

@media (max-width: 760px) {
    .work-area.layout-columns { grid-template-columns: 1fr; }
    .toolbar { position: static; }
    /* Reset both auto-margins together so the ribbon flows left-aligned. */
    .tool-group--center, .tool-group--actions { margin-left: 0; }
}

/* Compact toolbar labels on narrow screens: swap long labels for short ones,
   drop the group headers, and reduce Reset/Help to their icons. */
.lbl-short { display: none; }
@media (max-width: 480px) {
    .toolbar .tool-label { display: none; }
    .toolbar .lbl-full { display: none; }
    .toolbar .lbl-short { display: inline; }
    .toolbar .lbl-hide { display: none; }
}

/* Results table row interactions */
#values-table tbody tr.clickable { cursor: pointer; }
#values-table tbody tr.active { background: var(--primary-soft); }
.row-del {
    display: inline-flex; align-items: center; justify-content: center;
    width: 26px; height: 26px; padding: 0; border: none; border-radius: 6px;
    background: transparent; color: var(--text-muted); cursor: pointer;
}
.row-del:hover { background: var(--surface-2); color: var(--red); }
.row-del .icon { width: 15px; height: 15px; }