/* Content Sequencing Algorithm Simulator - vis-network MicroSim
 * =============================================================
 * Two-panel layout: graph (left ~480px) + Recommended Next panel & controls
 * (right ~200px). Panels stack vertically below 700px. The graph panel is a
 * positioned wrapper whose only vis-network child is #network; the legend and
 * hint are sibling overlays, never children of #network.
 */

/* ===========================================
   RESET & BASE
   =========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: aliceblue;
}

.container {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===========================================
   TITLE
   =========================================== */
.title {
    flex: 0 0 auto;
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    color: black;
    padding: 8px 12px 4px;
}

/* ===========================================
   PANELS
   =========================================== */
.panels {
    flex: 1 1 auto;
    display: flex;
    flex-direction: row;
    gap: 10px;
    padding: 8px 10px 10px;
    min-height: 0;
}

/* ---- Graph panel (left) ---- */
.graph-panel {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    background-color: #ffffff;
    border: 1px solid #d5e3f0;
    border-radius: 8px;
    overflow: hidden;
}

#network {
    width: 100%;
    height: 100%;
    background-color: aliceblue;
}

.legend {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 6px 8px;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 10;
}

.legend-item {
    display: flex;
    align-items: center;
    margin: 3px 0;
    font-size: 11px;
    color: #333;
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    margin-right: 6px;
    border: 2px solid #333;
    flex-shrink: 0;
}

.legend-ring {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    margin-right: 6px;
    background-color: transparent;
    border: 3px solid #e53935;
    flex-shrink: 0;
    box-sizing: border-box;
}

.color-notmastered { background-color: #c8c8c8; }
.color-mastered    { background-color: #43a047; }
.color-due         { background-color: #f5a623; }

.graph-hint {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(255, 255, 255, 0.9);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 11px;
    color: #555;
    z-index: 10;
    white-space: nowrap;
}

/* ---- Right panel ---- */
.right-panel {
    flex: 0 0 210px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
}

.rec-panel {
    background-color: #ffffff;
    border: 2px solid #43a047;
    border-radius: 10px;
    padding: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.rec-title {
    font-size: 14px;
    font-weight: bold;
    color: #2e7d32;
    margin-bottom: 8px;
}

.rec-list {
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1 1 auto;
}

.rec-list li {
    padding: 7px 9px;
    margin-bottom: 6px;
    background-color: #f1f8f2;
    border-left: 4px solid #43a047;
    border-radius: 4px;
    font-size: 13px;
    color: #1b3a1f;
    line-height: 1.3;
}

.rec-list li .rec-branch {
    display: block;
    font-size: 10px;
    color: #6d8f70;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.rec-list li.rec-due {
    background-color: #fff6e6;
    border-left-color: #f5a623;
    color: #6b4a10;
}

.rec-list li.rec-due .rec-branch {
    color: #b98420;
}

.rec-list li.rec-empty {
    background-color: #f4f4f4;
    border-left-color: #bbb;
    color: #777;
    font-style: italic;
}

.rec-caption {
    margin-top: 8px;
    font-size: 11px;
    line-height: 1.45;
    color: #5d4037;
    background-color: #fff8e1;
    border: 1px solid #ffe082;
    border-radius: 6px;
    padding: 8px 10px;
    display: none;
}

.rec-caption.show {
    display: block;
}

/* ---- Controls ---- */
.controls {
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    padding: 10px 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn {
    padding: 9px 12px;
    font-size: 13px;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
}

.btn-accent {
    background-color: #f5a623;
    color: #3a2a05;
}

.btn-accent:hover {
    background-color: #e2951a;
}

.btn-secondary {
    background-color: #757575;
    color: white;
}

.btn-secondary:hover {
    background-color: #616161;
}

.toggle-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: #333;
    cursor: pointer;
    user-select: none;
    line-height: 1.3;
}

.toggle-row input {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    cursor: pointer;
}

/* ===========================================
   RESPONSIVE - stack panels vertically below 700px
   =========================================== */
@media (max-width: 700px) {
    .panels {
        flex-direction: column;
    }

    .graph-panel {
        flex: 1 1 auto;
        min-height: 300px;
    }

    .right-panel {
        flex: 0 0 auto;
    }

    .title {
        font-size: 15px;
    }
}