/* Minimalist Untangle Game Theme */
:root {
    --bg-main: #0c0f17;
    --text-muted: rgba(255, 255, 255, 0.45);
    --neon-cyan: #00e5ff;
    --neon-green: #00ff88;
    --neon-spark: #ffd700;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
}

html, body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: var(--bg-main);
    color: #ffffff;
    font-family: var(--font-family);
}

/* Fullscreen Network Viewport */
#networkContainer {
    width: 100vw;
    height: 100vh;
    display: block;
    background-color: var(--bg-main);
    overflow: hidden;
}

/* Minimal Top Info Bar */
.minimal-hud {
    position: absolute;
    top: 20px;
    left: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    pointer-events: none;
    z-index: 10;
}

.level-tag {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
}

.timer-tag {
    font-size: 13px;
    font-weight: 500;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

/* Minimal Top-Right Controls */
.top-controls {
    position: absolute;
    top: 16px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 20;
}

/* Small Spark Light Hint Button */
.spark-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(20, 26, 38, 0.7);
    border: 1px solid rgba(255, 215, 0, 0.4);
    color: var(--neon-spark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(8px);
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.2);
    transition: all 0.25s ease;
}

.spark-btn:hover {
    background: rgba(255, 215, 0, 0.15);
    border-color: var(--neon-spark);
    box-shadow: 0 0 25px rgba(255, 215, 0, 0.6);
    transform: scale(1.08);
}

.spark-btn:active {
    transform: scale(0.95);
}

.spark-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
    filter: drop-shadow(0 0 4px rgba(255, 215, 0, 0.7));
}

/* Subtle Reset Button */
.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(20, 26, 38, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(8px);
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.3);
}

.icon-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Victory Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(6, 8, 14, 0.75);
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-card {
    background: rgba(16, 21, 32, 0.95);
    border: 1px solid rgba(0, 255, 136, 0.4);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7), 0 0 25px rgba(0, 255, 136, 0.2);
    border-radius: 16px;
    padding: 30px 40px;
    text-align: center;
    max-width: 320px;
    width: 85%;
    transform: scale(1);
    transition: transform 0.25s ease;
}

.modal-overlay.hidden .modal-card {
    transform: scale(0.92);
}

.victory-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--neon-green);
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.victory-sub {
    font-size: 13px;
    color: var(--text-muted);
    font-family: monospace;
    margin-bottom: 22px;
}

.btn-next {
    background: rgba(0, 255, 136, 0.15);
    border: 1px solid var(--neon-green);
    color: #ffffff;
    padding: 10px 24px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.25);
    transition: all 0.2s ease;
}

.btn-next:hover {
    background: rgba(0, 255, 136, 0.3);
    box-shadow: 0 0 25px rgba(0, 255, 136, 0.5);
    transform: translateY(-1px);
}

/* How to Play Modal with 3 Visual Cards */
.help-card {
    max-width: 520px;
    width: 92%;
    padding: 26px 22px 24px 22px;
    text-align: center;
}

.help-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: #00e5ff;
    text-align: center;
    margin-bottom: 20px;
}

.tutorial-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 24px;
}

.step-card {
    background: rgba(22, 29, 44, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 8px 6px 12px 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.2s ease;
}

.step-card:hover {
    border-color: rgba(0, 229, 255, 0.4);
    background: rgba(26, 36, 56, 0.85);
    transform: translateY(-2px);
}

.step-canvas-wrap {
    width: 100%;
    aspect-ratio: 11 / 8;
    margin-bottom: 8px;
    border-radius: 8px;
    overflow: hidden;
    background: #080b12;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.step-svg {
    width: 100%;
    height: 100%;
    display: block;
}

.step-label {
    font-size: 11.5px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 3px;
    letter-spacing: 0.3px;
}

.step-desc {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.3;
}

.btn-play {
    background: linear-gradient(135deg, rgba(0, 229, 255, 0.25), rgba(0, 255, 136, 0.25));
    border: 1px solid #00ff88;
    color: #ffffff;
    padding: 12px 28px;
    border-radius: 24px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    display: block;
    width: 100%;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
    transition: all 0.2s ease;
}

.btn-play:hover {
    background: linear-gradient(135deg, rgba(0, 229, 255, 0.4), rgba(0, 255, 136, 0.4));
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.6);
    transform: translateY(-1px);
}

@media (max-width: 520px) {
    .tutorial-steps {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .step-card {
        flex-direction: row;
        gap: 12px;
        padding: 8px 12px;
        text-align: left;
    }
    .step-canvas-wrap {
        width: 85px;
        flex-shrink: 0;
        margin-bottom: 0;
    }
}