:root {
    --bg-dark: #0f172a;
    --board-bg: #1e293b;

    --sys-blue: #3b82f6;
    --sys-purple: #8b5cf6;
    --sys-green: #10b981;
    --sys-danger: #ef4444;
    --sys-warn: #fbbf24;

    --font-ui: 'Kanit', sans-serif;
    --font-sys: 'Orbitron', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-ui);
    background-color: #000;
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.game-container {
    width: 100%;
    max-width: 1000px;
    height: 90vh;
    position: relative;
    background: var(--bg-dark);
    border-radius: 12px;
    border: 3px solid #334155;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
}

/* Background Effects */
.tech-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(51, 65, 85, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(51, 65, 85, 0.3) 1px, transparent 1px);
    background-size: 30px 30px;
    z-index: 1;
    pointer-events: none;
    opacity: 0.5;
}

.screen-flash {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(239, 68, 68, 0.4);
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
}

.screen-flash.active {
    opacity: 1;
}

.screen-flash.active-green {
    background: rgba(16, 185, 129, 0.3);
    opacity: 1;
}

.shake-anim {
    animation: shakeGame 0.4s ease;
}

@keyframes shakeGame {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    50% {
        transform: translateX(10px);
    }

    75% {
        transform: translateX(-10px);
    }
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: rgba(15, 23, 42, 0.9);
    border-bottom: 2px solid #334155;
    z-index: 10;
    position: relative;
}

.level-info {
    font-size: 1.3rem;
    font-weight: 700;
    color: #38bdf8;
    text-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
}

.scoreboard {
    display: flex;
    gap: 20px;
    align-items: center;
}

.score,
.timer {
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-ui);
    background: #1e293b;
    padding: 5px 15px;
    border-radius: 6px;
    border: 1px solid #475569;
}

.score span {
    color: var(--sys-green);
    font-family: var(--font-sys);
    font-size: 1.3rem;
    font-weight: 700;
    text-shadow: 0 0 8px var(--sys-green);
}

.timer span {
    color: var(--sys-warn);
    font-family: var(--font-sys);
    font-size: 1.3rem;
    font-weight: 700;
}

.timer.warning span {
    color: var(--sys-danger);
    animation: flash 0.5s infinite alternate;
}

@keyframes flash {
    from {
        text-shadow: 0 0 10px var(--sys-danger);
    }

    to {
        text-shadow: none;
    }
}


/* Main Area */
.dashboard {
    flex-grow: 1;
    z-index: 10;
    display: flex;
    flex-direction: column;
    padding: 20px 30px;
    gap: 20px;
}

/* Instructions */
.instruction-panel {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid #475569;
    border-radius: 8px;
    padding: 12px 20px;
    color: #cbd5e1;
    font-size: 1.1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.instruction-panel i {
    color: #38bdf8;
    margin-right: 8px;
    font-size: 1.2rem;
}

.instruction-panel strong {
    color: #f8fafc;
}


/* Drop Zones */
.zones-container {
    display: flex;
    gap: 30px;
    flex-grow: 1;
    justify-content: space-between;
}

.drop-zone {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(15, 23, 42, 0.6);
    border-radius: 12px;
    border: 2px solid #475569;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
}

.zone-header {
    padding: 15px;
    text-align: center;
    font-size: 1.3rem;
    font-weight: 700;
    font-family: var(--font-ui);
    color: #fff;
    letter-spacing: 1px;
}

.zone-internal .zone-header {
    background: linear-gradient(90deg, #1e3a8a, #2563eb);
    border-bottom: 2px solid #3b82f6;
}

.zone-external .zone-header {
    background: linear-gradient(90deg, #4c1d95, #7c3aed);
    border-bottom: 2px solid #8b5cf6;
}

.drop-area {
    flex-grow: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
    justify-content: flex-start;
    overflow-y: auto;
    position: relative;
    transition: background 0.2s, box-shadow 0.2s;
}

.zone-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #64748b;
    font-size: 1.2rem;
    font-weight: 600;
    pointer-events: none;
}

/* Drag Over States */
.internal-area.drag-over {
    background: rgba(59, 130, 246, 0.1);
    box-shadow: inset 0 0 20px rgba(59, 130, 246, 0.3);
}

.external-area.drag-over {
    background: rgba(139, 92, 246, 0.1);
    box-shadow: inset 0 0 20px rgba(139, 92, 246, 0.3);
}


/* Spawn Area */
.spawn-panel {
    background: #1e293b;
    border: 2px solid #334155;
    border-radius: 8px;
    padding: 20px;
    position: relative;
    min-height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.panel-tag {
    position: absolute;
    top: -12px;
    left: 20px;
    background: #0f172a;
    color: #94a3b8;
    font-size: 0.8rem;
    font-family: var(--font-sys);
    font-weight: 700;
    padding: 2px 10px;
    border: 1px solid #334155;
    border-radius: 4px;
}

.spawn-area {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

/* Draggable Cards */
.data-card {
    background: #fdfdfd;
    border: 2px solid #94a3b8;
    border-radius: 6px;
    padding: 12px 20px;
    color: #0f172a;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: grab;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    user-select: none;
    transition: transform 0.1s, box-shadow 0.1s;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    0% {
        opacity: 0;
        transform: scale(0.5);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.data-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.6);
}

.data-card:active {
    cursor: grabbing;
    transform: scale(0.95);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

.data-card.dragging {
    opacity: 0.4;
    transform: scale(0.9);
}

.card-icon {
    color: #64748b;
    font-size: 1.2rem;
}

/* When cards are dropped successfully */
.drop-area .data-card {
    cursor: default;
    animation: none;
    transform: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    width: 90%;
    justify-content: center;
}


/* Floating Feedback Texts */
#popup-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 500;
}

.floating-text {
    position: absolute;
    font-size: 1.5rem;
    font-weight: 900;
    font-family: var(--font-ui);
    color: #fff;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
    animation: floatAlert 1.5s forwards;
    padding: 10px 20px;
    border-radius: 8px;
    border: 2px solid transparent;
    transform: translate(-50%, -50%);
    white-space: nowrap;
}

.floating-text.negative {
    background: rgba(220, 38, 38, 0.9);
    border-color: #fca5a5;
}

.floating-text.positive {
    background: rgba(16, 185, 129, 0.9);
    border-color: #6ee7b7;
    font-size: 2rem;
}

@keyframes floatAlert {
    0% {
        opacity: 0;
        transform: translate(-50%, 0) scale(0.8);
    }

    20% {
        opacity: 1;
        transform: translate(-50%, -20px) scale(1.1);
    }

    80% {
        opacity: 1;
        transform: translate(-50%, -60px) scale(1);
    }

    100% {
        opacity: 0;
        transform: translate(-50%, -80px);
    }
}


/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.3s;
}

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

.overlay-content {
    background: #1e293b;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
    max-width: 500px;
    border: 3px solid #475569;
    color: #f8fafc;
}

.overlay-content.success {
    border-color: var(--sys-green);
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.3);
}

.overlay-content.failure {
    border-color: var(--sys-danger);
    box-shadow: 0 0 40px rgba(239, 68, 68, 0.3);
}

.overlay-icon {
    font-size: 5rem;
    margin-bottom: 20px;
}

.overlay-content.success .overlay-icon {
    color: var(--sys-green);
}

.overlay-content.failure .overlay-icon {
    color: var(--sys-danger);
}

.overlay-content h2 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

.overlay-content.success h2 {
    color: var(--sys-green);
}

.overlay-content.failure h2 {
    color: var(--sys-danger);
}

.overlay-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    line-height: 1.5;
    color: #cbd5e1;
}

.btn {
    padding: 15px 35px;
    font-size: 1.2rem;
    font-family: var(--font-ui);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    color: white;
    transition: all 0.2s;
}

.next-btn {
    background: var(--sys-green);
    color: #000;
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.3);
}

.next-btn:hover {
    filter: brightness(1.2);
    transform: translateY(-3px);
}

.retry-btn {
    background: var(--sys-danger);
    box-shadow: 0 5px 15px rgba(239, 68, 68, 0.3);
}

.retry-btn:hover {
    filter: brightness(1.2);
    transform: translateY(-3px);
}