/* Copyright (c) 2025. Jericho Crosby (Chalwk) */

:root{
    --bg:#0f1724;
    --glass: rgba(255,255,255,0.06);
    --accent1: #7ee7c7;
    --accent2: #6ea8fe;
    --muted: rgba(255,255,255,0.6);
    --radius: 14px;
}

*{box-sizing:border-box}
html,body,#svg{height:100%}
body{
    margin:0; font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background: radial-gradient(1200px 700px at 10% 10%, rgba(110,168,254,0.08), transparent),
    radial-gradient(800px 600px at 90% 80%, rgba(126,231,199,0.04), transparent),
    var(--bg);
    color: #e6eef8;
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
    min-height:100vh;
    display:flex;align-items:center;justify-content:center;padding:28px;
}

.app{
    width:1100px; max-width:calc(100% - 48px); background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
    border-radius:20px; padding:12px; box-shadow: 0 10px 30px rgba(2,6,23,0.7); overflow:hidden; display:flex;flex-direction:column;
}

.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 18px}
.brand{font-weight:700;font-size:20px;letter-spacing:0.6px;background:linear-gradient(90deg,var(--accent1),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.controls{display:flex;gap:10px;align-items:center}
.btn{background:var(--glass);border:0;padding:8px 12px;border-radius:10px;color:var(--muted);cursor:pointer;backdrop-filter:blur(6px);transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-3px);box-shadow:0 6px 18px rgba(0,0,0,0.45)}
.btn.primary{background:linear-gradient(90deg,var(--accent2),var(--accent1));color:#072029;font-weight:700}
a.btn.return{display:inline-flex;align-items:center;text-decoration:none}

.game-area{display:flex;gap:14px;padding:8px}
.sidebar{width:220px;display:flex;flex-direction:column;gap:12px}
.panel{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:12px;border-radius:12px;border:1px solid rgba(255,255,255,0.03)}
.panel h3{margin:0;font-size:12px;color:var(--muted);font-weight:600}
.panel > div{font-size:18px;margin-top:8px}
.panel.note{font-size:13px;color:rgba(255,255,255,0.75)}

.canvas-wrap{flex:1;position:relative;border-radius:12px;overflow:hidden;background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.006));padding:10px}
.svg-canvas{width:100%;height:100%;display:block;background:transparent}

.node{cursor:grab}
.node:active{cursor:grabbing}

/* Node visuals drawn as circle with glow */
.node-circle{filter:drop-shadow(0 6px 16px rgba(110,168,254,0.12));}
.node-label{font-size:10px;pointer-events:none;fill:#e6eef8;}

.edge{stroke:rgba(255,255,255,0.75);stroke-width:3;stroke-linecap:round}
.edge.crossing{stroke:#ff6b6b;stroke-width:4}

.win-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(3px);}
.win-overlay.hidden{display:none}
.win-card{background:linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));padding:28px;border-radius:14px;border:1px solid rgba(255,255,255,0.04);text-align:center}
.win-card h2{margin:0 0 6px 0;background:linear-gradient(90deg,var(--accent1),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.win-actions{display:flex;gap:10px;justify-content:center;margin-top:12px}

.footer{padding:12px;text-align:center;color:rgba(255,255,255,0.45);font-size:13px}

/* little floating instructions */
.hint{position:absolute;left:12px;bottom:12px;padding:8px 12px;border-radius:999px;background:rgba(0,0,0,0.28);font-size:13px}

/* Mobile Instructions */
.mobile-instructions {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 36, 0.95);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.mobile-instructions.hidden {
    display: none;
}

.instructions-content {
    background: var(--glass);
    padding: 24px;
    border-radius: var(--radius);
    text-align: center;
    max-width: 300px;
    border: 1px solid rgba(255,255,255,0.1);
}

.instructions-content h3 {
    margin: 0 0 16px 0;
    background: linear-gradient(90deg,var(--accent1),var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-size: 20px;
}

.instructions-content p {
    margin: 12px 0;
    font-size: 16px;
    color: var(--muted);
}

.instructions-content .btn {
    margin-top: 16px;
    width: 100%;
}

/* Prevent text selection and improve tap */
* {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Mobile-specific improvements */
@media (max-width: 768px) {
    body {
        padding: 12px 8px;
        min-height: 100vh;
        display: block;
        align-items: flex-start;
        justify-content: flex-start;
        overflow-x: hidden;
    }

    .app {
        width: 100%;
        max-width: 100%;
        padding: 8px;
        border-radius: 16px;
        min-height: 95vh;
        max-height: 95vh;
        display: flex;
        flex-direction: column;
    }

    .topbar {
        flex-wrap: wrap;
        gap: 8px;
        padding: 10px 12px;
    }

    .brand {
        font-size: 18px;
        width: 100%;
        text-align: center;
        margin-bottom: 4px;
    }

    .controls {
        width: 100%;
        justify-content: space-between;
        gap: 8px;
    }

    .btn {
        padding: 10px 16px;
        font-size: 14px;
        flex: 1;
        min-height: 44px;
    }

    .game-area {
        flex: 1;
        min-height: 0;
        padding: 4px;
        gap: 8px;
    }

    .sidebar {
        display: none;
    }

    .canvas-wrap {
        min-height: 400px;
        padding: 6px;
        flex: 1;
    }

    /* Make nodes larger for touch */
    .node-circle {
        filter: drop-shadow(0 4px 12px rgba(110,168,254,0.15));
    }

    .node-label {
        font-size: 12px;
        font-weight: bold;
    }

    /* Adjust edge thickness */
    .edge {
        stroke-width: 4;
    }

    .edge.crossing {
        stroke-width: 5;
    }

    /* Win overlay adjustments */
    .win-card {
        padding: 24px 16px;
        margin: 0 12px;
        width: 90%;
        max-width: 320px;
    }

    .win-actions {
        flex-direction: column;
        gap: 8px;
    }

    .win-actions .btn {
        width: 100%;
    }

    /* Footer adjustments */
    .footer {
        padding: 8px;
        font-size: 11px;
    }

    /* Hide hint on very small screens */
    .hint {
        display: none;
    }
}

/* Extra small devices */
@media (max-width: 480px) {
    .btn {
        padding: 12px 8px;
        font-size: 13px;
        min-height: 48px;
    }

    .controls {
        flex-wrap: wrap;
    }

    .btn.primary {
        order: -1;
        width: 100%;
    }

    .canvas-wrap {
        border-radius: 10px;
    }

    /* Adjust node hit area */
    .node {
        cursor: pointer;
    }

    .node-circle {
        r: 16;
    }
}

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 980px) {
    .app {
        width: 95%;
        padding: 16px;
    }

    .btn {
        padding: 10px 18px;
        min-height: 44px;
    }

    .game-area {
        gap: 20px;
    }

    .sidebar {
        display: none;
    }
}

/* Landscape orientation on mobile */
@media (max-height: 600px) and (orientation: landscape) {
    body {
        padding: 4px;
    }

    .app {
        min-height: 96vh;
        max-height: 96vh;
    }

    .topbar {
        padding: 6px 10px;
    }

    .game-area {
        flex-direction: row;
    }

    .canvas-wrap {
        height: 85vh;
    }
}