/* ════════════════════════════════════════════════════════════
   Design tokens
════════════════════════════════════════════════════════════ */
:root {
    --font:  'Inter', system-ui, -apple-system, sans-serif;
    --mono:  'JetBrains Mono', 'Consolas', monospace;

    /* Palette */
    --navy:   #0f172a;
    --navy-2: #1e293b;
    --navy-3: #334155;
    --slate:  #64748b;
    --slate-2:#94a3b8;
    --slate-3:#cbd5e1;

    --bg:      #ebecf0;
    --surface: #ffffff;
    --surf-2:  #f8f9fb;
    --surf-3:  #f2f4f7;

    --border:  #dde1e8;
    --brd-2:   #c4cad6;

    --blue:    #2563eb;
    --blue-d:  #1d4ed8;

    /* Row accent colours */
    --c-ioq:  #8b5cf6;
    --c-io:   #22c55e;
    --c-rq:   #64748b;
    --c-cpu:  #3b82f6;

    /* Process colours */
    --p1: #3b82f6;
    --p2: #22c55e;
    --p3: #f59e0b;
    --p4: #8b5cf6;
    --p5: #ef4444;

    /* Grid dimensions */
    --lbl-w:  140px;   /* row-label column */
    --cell-w:  46px;   /* one time-unit cell */
    --cell-h:  36px;   /* row height */
    --time-h:  32px;   /* time-row height */

    /* App chrome */
    --bar-h:    48px;
    --tp-h:    130px;  /* top-panel height */

    --r:    8px;
    --r-sm: 5px;
    --r-xs: 3px;

    --shadow:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
    --shadow-lg: 0 4px 16px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.05);
}

/* ════════════════════════════════════════════════════════════
   Reset & base
════════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--navy);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
}

/* ════════════════════════════════════════════════════════════
   Site header — title, credit, tagline
════════════════════════════════════════════════════════════ */
.site-header {
    flex-shrink: 0;
    z-index: 200;
    background: linear-gradient(135deg, #0c1628 0%, #0f1f3d 60%, #0f172a 100%);
    border-bottom: 2px solid #2563eb;
    box-shadow: 0 4px 20px rgba(0,0,0,.35);
}

.site-header-inner {
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

/* ── Brand cluster ──────────────────────────────────────── */
.site-brand {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
}

.site-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,99,235,.45), 0 0 0 1px rgba(255,255,255,.08) inset;
}

.site-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.site-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: #f1f5f9;
    letter-spacing: -.02em;
    line-height: 1.2;
    white-space: nowrap;
}

.site-subtitle {
    font-size: .8rem;
    font-weight: 500;
    color: #93c5fd;       /* light blue — personal / credit tone */
    letter-spacing: .01em;
    white-space: nowrap;
}

.site-subtitle strong {
    font-weight: 700;
    color: #bfdbfe;
}

.site-tagline {
    font-size: .68rem;
    color: var(--slate);
    white-space: nowrap;
}

/* ════════════════════════════════════════════════════════════
   Buttons
════════════════════════════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    border: none;
    border-radius: var(--r-sm);
    font-family: var(--font);
    font-size: .78rem;
    font-weight: 600;
    cursor: pointer;
    padding: 6px 13px;
    white-space: nowrap;
    user-select: none;
    transition: background .12s, box-shadow .12s, transform .08s;
}
.btn:active { transform: translateY(1px); }

.btn-reset {
    background: transparent;
    color: var(--slate-2);
    border: 1px solid var(--navy-2);
    padding: 5px 11px;
    flex-shrink: 0;
}
.btn-reset:hover { background: var(--navy-2); color: #e2e8f0; }

.btn-apply {
    background: var(--blue);
    color: #fff;
    margin-left: 4px;
    padding: 0 18px;
    height: 30px;
    align-self: flex-end;
    flex-shrink: 0;
}
.btn-apply:hover { background: var(--blue-d); box-shadow: 0 2px 8px rgba(37,99,235,.35); }

.btn-export {
    background: #16a34a;
    color: #fff;
    border: 1px solid #15803d;
    flex-shrink: 0;
}
.btn-export:hover { background: #15803d; box-shadow: 0 2px 8px rgba(22,163,74,.35); }

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* ════════════════════════════════════════════════════════════
   Session restore banner
════════════════════════════════════════════════════════════ */
.restore-banner {
    flex-shrink: 0;
    background: #eff6ff;
    border-bottom: 1px solid #bfdbfe;
    padding: 7px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: .74rem;
    color: #1e40af;
    z-index: 100;
}

.restore-banner.hidden { display: none; }

.restore-icon { font-size: .95rem; flex-shrink: 0; }

.restore-msg { flex: 1; font-weight: 500; }

.restore-btn {
    padding: 4px 13px;
    border-radius: var(--r-xs);
    font-size: .72rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid;
    transition: background .1s;
    flex-shrink: 0;
}

.restore-yes { background: var(--blue); color: #fff; border-color: var(--blue-d); }
.restore-yes:hover { background: var(--blue-d); }

.restore-no { background: transparent; color: #1e40af; border-color: #93c5fd; }
.restore-no:hover { background: #dbeafe; }

/* ════════════════════════════════════════════════════════════
   Disclaimer banner
════════════════════════════════════════════════════════════ */
.disclaimer {
    flex-shrink: 0;
    background: #fefce8;
    border-bottom: 1px solid #fde68a;
    padding: 6px 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: .7rem;
    color: #78350f;
}

.disclaimer-icon { font-size: .9rem; flex-shrink: 0; }

/* ════════════════════════════════════════════════════════════
   Top panel — fixed height, always visible, no scroll
════════════════════════════════════════════════════════════ */
.top-panel {
    height: var(--tp-h);
    flex-shrink: 0;
    display: flex;
    gap: 10px;
    padding: 8px 14px;
    background: var(--surf-2);
    border-bottom: 1px solid var(--border);
    overflow: hidden;          /* absolutely no scroll */
}

/* ── Card shell ─────────────────────────────────────────── */
.tp-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow);
    flex-shrink: 0;
}

.tp-card-head {
    padding: 5px 12px;
    font-size: .6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--slate-2);
    background: var(--surf-2);
    border-bottom: 1px solid var(--border);
    user-select: none;
    flex-shrink: 0;
}

.tp-card-body {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 8px;
    min-height: 0;
}

/* ── Config card ────────────────────────────────────────── */
.cfg-card { flex: 0 0 auto; }

.cfg-body { flex-wrap: nowrap; }

.ctrl-group {
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex-shrink: 0;
}

.ctrl-label {
    font-size: .65rem;
    font-weight: 600;
    color: var(--navy-3);
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.ctrl-range {
    font-size: .58rem;
    font-weight: 500;
    color: var(--slate-2);
    background: var(--surf-3);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 0 4px;
}

.ctrl-divider {
    width: 1px;
    height: 44px;
    background: var(--border);
    flex-shrink: 0;
}

/* ── Spinbox ────────────────────────────────────────────── */
.spinbox {
    display: flex;
    height: 28px;
    border: 1px solid var(--brd-2);
    border-radius: var(--r-sm);
    overflow: hidden;
}

.spinbox input[type="number"] {
    width: 34px;
    border: none;
    outline: none;
    text-align: center;
    font-family: var(--mono);
    font-size: .78rem;
    font-weight: 600;
    color: var(--navy);
    background: var(--surface);
    -moz-appearance: textfield;
}
.spinbox input::-webkit-inner-spin-button,
.spinbox input::-webkit-outer-spin-button { -webkit-appearance: none; }

.spin {
    border: none;
    background: var(--surf-2);
    color: var(--slate);
    font-family: var(--mono);
    font-size: .78rem;
    font-weight: 700;
    cursor: pointer;
    padding: 0 8px;
    transition: background .1s, color .1s;
    flex-shrink: 0;
    user-select: none;
    border-right: 1px solid var(--border);
}
.spin:last-child { border-right: none; border-left: 1px solid var(--border); }
.spin:hover  { background: var(--border); color: var(--navy); }
.spin:active { background: var(--brd-2); }
.spin-wide   { padding: 0 6px; font-size: .72rem; }

/* ── Palette card ───────────────────────────────────────── */
.pal-card { flex: 1; min-width: 0; overflow: hidden; }

.pal-body { gap: 12px; }

.proc-chips {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.proc {
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: .8rem;
    color: #fff;
    border-radius: var(--r-sm);
    cursor: grab;
    user-select: none;
    letter-spacing: .04em;
    position: relative;
    overflow: hidden;
    transition: transform .12s, box-shadow .12s, opacity .14s;
}
.proc::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(140deg, rgba(255,255,255,.18), transparent 55%);
    pointer-events: none;
}
.proc:hover   { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.proc:active  { cursor: grabbing; transform: scale(.95); }
.proc.dragging{ opacity: .25; transform: scale(.94); }

.p1 { background: var(--p1); }
.p2 { background: var(--p2); }
.p3 { background: var(--p3); }
.p4 { background: var(--p4); }
.p5 { background: var(--p5); }

/* ── Palette info (tip + legend) ────────────────────────── */
.pal-right {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    min-width: 0;
}

.pal-tip {
    font-size: .69rem;
    color: var(--slate-2);
    white-space: nowrap;
}

.legend {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.leg-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: .68rem;
    color: var(--slate);
    white-space: nowrap;
}

.leg-pip {
    width: 10px; height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.ioq-pip { background: var(--c-ioq); }
.io-pip  { background: var(--c-io); }
.rq-pip  { background: var(--c-rq); }
.cpu-pip { background: var(--c-cpu); }

/* ── Naming style bar (inside palette card, below body) ──── */
.naming-bar {
    flex-shrink: 0;
    height: 30px;
    border-top: 1px solid var(--border);
    padding: 0 12px;
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--surf-3);
    overflow: hidden;
}

.naming-label {
    font-size: .6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--slate-2);
    flex-shrink: 0;
}

.naming-opt {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: .7rem;
    color: var(--navy-3);
    cursor: pointer;
    flex-shrink: 0;
    white-space: nowrap;
    user-select: none;
}

.naming-opt input[type="radio"] {
    accent-color: var(--blue);
    cursor: pointer;
    flex-shrink: 0;
}

.naming-opt input[type="text"] {
    height: 22px;
    border: 1px solid var(--brd-2);
    border-radius: var(--r-xs);
    padding: 0 7px;
    font-family: var(--mono);
    font-size: .7rem;
    color: var(--navy);
    background: var(--surface);
    outline: none;
    width: 150px;
    transition: border-color .15s, box-shadow .15s;
}
.naming-opt input[type="text"]:not(:disabled) { border-color: var(--blue); }
.naming-opt input[type="text"]:not(:disabled):focus {
    box-shadow: 0 0 0 2px rgba(37,99,235,.18);
}
.naming-opt input[type="text"]:disabled {
    background: var(--surf-3);
    color: var(--slate-2);
    cursor: not-allowed;
}

.naming-hint {
    font-size: .62rem;
    color: var(--slate-2);
}
.naming-info { margin-left: auto; flex-shrink: 0; }

/* ════════════════════════════════════════════════════════════
   Grid area — fills remaining height, scrollable
════════════════════════════════════════════════════════════ */
.grid-area {
    flex: 1;
    overflow: hidden;
    padding: 14px 16px 16px;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    position: relative;   /* anchor for .scroll-hint */
}

.grid-scroll {
    flex: 1;
    overflow: auto;
    border-radius: var(--r);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--border);
    background: var(--surface);
    scroll-behavior: smooth;
}

.grid-scroll::-webkit-scrollbar { width: 8px; height: 8px; }
.grid-scroll::-webkit-scrollbar-corner { background: transparent; }
.grid-scroll::-webkit-scrollbar-track  { background: transparent; }
.grid-scroll::-webkit-scrollbar-thumb  { background: var(--brd-2); border-radius: 4px; }

/* ════════════════════════════════════════════════════════════
   Grid (flex column of rows)
════════════════════════════════════════════════════════════ */
.grid {
    display: flex;
    flex-direction: column;
    width: max-content;
    min-width: 100%;
    min-height: 100%;
}

/* ── Every row ──────────────────────────────────────────── */
.grid-row {
    display: flex;
    flex-direction: row;
}

/* ── Section separator — top border on first row of new group */
.grid-row.sec-start .row-label,
.grid-row.sec-start .cell {
    border-top: 2px solid var(--brd-2) !important;
}

/* ════════════════════════════════════════════════════════════
   Row labels (leftmost column, sticky)
════════════════════════════════════════════════════════════ */
.row-label {
    width: var(--lbl-w);
    min-width: var(--lbl-w);
    flex-shrink: 0;

    display: flex;
    align-items: center;
    padding: 0 10px 0 12px;

    font-size: .68rem;
    font-weight: 600;
    white-space: nowrap;
    user-select: none;

    background: var(--navy-2);
    border-right: 2px solid var(--navy-3);
    border-bottom: 1px solid #2d3a50;

    /* Sticky: stays visible on horizontal scroll */
    position: sticky;
    left: 0;
    z-index: 15;
}

/* Type-specific accent stripe + text colour */
.ioq-label { border-left: 3px solid var(--c-ioq); color: #c4b5fd; }
.io-label  { border-left: 3px solid var(--c-io);  color: #86efac; }
.rq-label  { border-left: 3px solid var(--c-rq);  color: var(--slate-2); }
.cpu-label { border-left: 3px solid var(--c-cpu); color: #93c5fd; }

/* ════════════════════════════════════════════════════════════
   Grid cells (droppable, neutral grey)
════════════════════════════════════════════════════════════ */
.cell {
    width: var(--cell-w);
    min-width: var(--cell-w);
    flex-shrink: 0;
    height: var(--cell-h);
    border-right: 1px solid #e4e7ed;
    border-bottom: 1px solid #e4e7ed;
    background: #f5f6f8;
    position: relative;
    transition: background .1s, box-shadow .1s;
    cursor: crosshair;
    padding: 2px;
}

/* Alternate row tint — applied via JS class on the row */
.grid-row.alt-row .cell { background: #f0f2f5; }

/* Stronger vertical line every 5 units */
.cell.tick { border-right: 1px solid var(--brd-2); }

/* ── Drop interactions ──────────────────────────────────── */
.cell:not(:has(.placed)):hover {
    background: #edf4ff !important;
    box-shadow: inset 0 0 0 1.5px #93c5fd;
}

.cell.drag-over {
    background: #dbeafe !important;
    box-shadow: inset 0 0 0 2px #3b82f6 !important;
    z-index: 5;
}

/* ════════════════════════════════════════════════════════════
   Time row — sticky at the bottom
════════════════════════════════════════════════════════════ */
.time-row {
    position: sticky;
    bottom: 0;
    z-index: 20;
    flex-shrink: 0;
}

.time-row .row-label {
    background: var(--navy);
    border-bottom: none;
    border-left: none;           /* no accent stripe */
    border-right: 2px solid #1e293b;
    color: var(--slate);
    font-family: var(--mono);
    font-size: .64rem;
    height: var(--time-h);
    z-index: 25;                 /* above time cells + above other labels */
}

.time-cell {
    width: var(--cell-w);
    min-width: var(--cell-w);
    flex-shrink: 0;
    height: var(--time-h);
    background: var(--navy);
    border-right: 1px solid #1e293b;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--mono);
    font-size: .64rem;
    font-weight: 600;
    color: var(--slate-2);
    user-select: none;
}

.time-cell.tick { border-right: 1px solid var(--navy-3); color: var(--slate-3); }

/* ════════════════════════════════════════════════════════════
   Placed process blocks
════════════════════════════════════════════════════════════ */
.placed {
    position: absolute;
    inset: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: .66rem;
    color: #fff;
    border-radius: var(--r-xs);
    cursor: grab;
    user-select: none;
    letter-spacing: .04em;
    overflow: hidden;
    transition: filter .1s, box-shadow .1s, opacity .14s;
}

/* Gloss sheen overlay */
.placed::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(140deg, rgba(255,255,255,.2), transparent 55%);
    pointer-events: none;
    border-radius: inherit;
}

.placed:hover  { filter: brightness(1.1); box-shadow: 0 2px 8px rgba(0,0,0,.25); z-index: 2; }
.placed:active { cursor: grabbing; }
.placed.dragging { opacity: .2; }

/* Remove hint — fades in on hover */
.placed::after {
    content: '✕';
    position: absolute; top: 2px; right: 3px;
    font-size: 7px; font-weight: 700;
    opacity: 0;
    transition: opacity .12s;
    z-index: 1;
}
.placed:hover::after { opacity: .85; }

/* ════════════════════════════════════════════════════════════
   Site footer
════════════════════════════════════════════════════════════ */
.site-footer {
    flex-shrink: 0;
    background: var(--navy);
    border-top: 1px solid var(--navy-2);
    padding: 0 20px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    overflow: hidden;
}

.footer-credit {
    font-size: .72rem;
    color: var(--slate-2);
    white-space: nowrap;
    flex-shrink: 0;
}

.footer-credit strong {
    font-weight: 700;
    color: #93c5fd;
}

.footer-sep {
    width: 1px;
    height: 14px;
    background: var(--navy-3);
    flex-shrink: 0;
}

.footer-course {
    font-size: .68rem;
    color: var(--slate);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.footer-right { flex-shrink: 0; }

.footer-share {
    font-size: .68rem;
    color: var(--slate);
    white-space: nowrap;
    transition: color .15s;
}

.footer-share:hover { color: var(--slate-2); }

/* ════════════════════════════════════════════════════════════
   Scroll hint pill (appears when grid extends beyond viewport)
════════════════════════════════════════════════════════════ */
.scroll-hint {
    position: absolute;
    bottom: 52px;   /* sits just above the sticky time row */
    right: 28px;
    background: rgba(15, 23, 42, .82);
    color: #94a3b8;
    font-size: .65rem;
    font-weight: 600;
    letter-spacing: .05em;
    padding: 5px 12px;
    border-radius: 20px;
    pointer-events: none;
    display: flex;
    align-items: center;
    gap: 7px;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity .25s, transform .25s;
    z-index: 50;
    backdrop-filter: blur(6px);
    border: 1px solid rgba(255,255,255,.07);
    user-select: none;
}
.scroll-hint.visible { opacity: 1; transform: translateY(0); }

.scroll-hint-arr {
    font-size: .7rem;
    line-height: 1;
    color: #60a5fa;
}

/* ════════════════════════════════════════════════════════════
   Export loading overlay
════════════════════════════════════════════════════════════ */
.export-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 15, 28, .72);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    z-index: 10000;
    backdrop-filter: blur(4px);
}

.export-spinner {
    width: 38px;
    height: 38px;
    border: 3px solid rgba(255,255,255,.18);
    border-top-color: #3b82f6;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.export-msg {
    color: #e2e8f0;
    font-size: .9rem;
    font-weight: 600;
    letter-spacing: .02em;
}

/* ════════════════════════════════════════════════════════════
   Toast notification
════════════════════════════════════════════════════════════ */
.toast {
    position: fixed;
    bottom: 52px;
    left: 50%;
    transform: translateX(-50%) translateY(6px);
    background: #1e293b;
    color: #e2e8f0;
    font-size: .74rem;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: var(--r-sm);
    box-shadow: 0 4px 16px rgba(0,0,0,.28);
    opacity: 0;
    transition: opacity .2s, transform .2s;
    pointer-events: none;
    z-index: 9999;
    white-space: nowrap;
}
.toast.toast-show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ════════════════════════════════════════════════════════════
   Print / PDF export  (Ctrl+P or window.print)
════════════════════════════════════════════════════════════ */
@media print {
    html, body {
        height: auto;
        overflow: visible;
    }

    .restore-banner,
    .site-header,
    .disclaimer,
    .top-panel,
    .site-footer,
    .scroll-hint,
    .export-overlay,
    .btn { display: none !important; }

    .grid-area {
        flex: none;
        padding: 0;
        background: #fff;
        overflow: visible;
    }

    .grid-scroll {
        overflow: visible;
        box-shadow: none;
        border-radius: 0;
    }

    .grid { width: 100%; min-height: unset; }

    .row-label {
        background: #e2e8f0 !important;
        color: #1e293b !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .cell {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .placed {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .time-row { position: static; }

    .time-row .row-label,
    .time-cell {
        background: #1e293b !important;
        color: #cbd5e1 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}