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

:root {
    --primary-color: #00d4ff;
    --secondary-color: #ff006e;
    --accent-color: #8338ec;
    --dark-bg: #0a0e27;
    --dark-bg-secondary: #16213e;
    --glass-bg: rgba(20, 20, 40, 0.8);
    --text-primary: #ffffff;
    --text-secondary: #b0b8cc;
    --border-color: rgba(0, 212, 255, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.4);
}

html, body {
    width: 100%;
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-secondary) 100%);
    color: var(--text-primary);
    overflow-x: hidden;
    overflow-y: auto;
}

/* ========== UPLOAD PANEL ========== */
.upload-panel {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-secondary) 100%);
    position: relative;
    overflow-y: auto;
}

.upload-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(131, 56, 236, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(255, 0, 110, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.upload-container {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 50px 40px;
    max-width: 500px;
    width: 100%;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 0 20px rgba(0, 212, 255, 0.1);
    z-index: 10;
    animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.upload-title {
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 10px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    letter-spacing: 2px;
}

.upload-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 30px;
    letter-spacing: 1px;
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.upload-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.upload-label {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
}

.upload-label:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: var(--shadow-glow);
    transform: translateX(5px);
}

.upload-icon {
    font-size: 20px;
}

.upload-text {
    flex: 1;
}

.file-input {
    display: none;
}

.upload-status {
    font-size: 12px;
    color: var(--text-secondary);
    padding: 0 16px;
    height: 24px;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.upload-status.selected {
    color: var(--primary-color);
    font-weight: 600;
}

.upload-status.error {
    color: var(--secondary-color);
}

.start-button {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    border: 1px solid var(--primary-color);
    color: var(--dark-bg);
    font-size: 16px;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.start-button:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5), 0 0 20px rgba(131, 56, 236, 0.3);
}

.start-button:not(:disabled):active {
    transform: translateY(0);
}

.start-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.button-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.start-button:not(:disabled):hover .button-glow {
    opacity: 1;
}

.upload-hint {
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 20px;
}

/* ========== GAME WRAPPER ========== */
.game-wrapper {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.game-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(131, 56, 236, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

/* ========== HUD ========== */
.hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: rgba(10, 14, 39, 0.9);
    border-bottom: 2px solid var(--border-color);
    backdrop-filter: blur(5px);
    position: relative;
    z-index: 10;
    gap: 20px;
}

.hud-score,
.hud-high-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.hud-center {
    flex: 1;
    display: flex;
    justify-content: center;
    gap: 10px;
}

.score-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.score-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.hud-button {
    padding: 8px 16px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 16px;
    font-weight: 600;
}

.hud-button:hover {
    background: rgba(0, 212, 255, 0.2);
    box-shadow: var(--shadow-glow);
    transform: scale(1.05);
}

.hud-button:active {
    transform: scale(0.95);
}

@media (max-width: 600px) {
    .hud {
        padding: 15px 20px;
        gap: 10px;
    }

    .score-value {
        font-size: 20px;
    }

    .score-label {
        font-size: 10px;
    }
}

/* ========== GAME CANVAS ========== */
#gameCanvas {
    flex: 1;
    display: block;
    background: linear-gradient(180deg, #0a0e27 0%, #16213e 100%);
    position: relative;
    z-index: 5;
    cursor: none;
}

/* ========== MODALS ========== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    width: 90%;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.5),
        inset 0 0 20px rgba(0, 212, 255, 0.1);
    animation: popUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    text-align: center;
}

.modal-small {
    max-width: 300px;
    padding: 30px;
}

@keyframes popUp {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.pause-text {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.modal-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(0, 212, 255, 0.05);
    border-radius: 12px;
}

.stat-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    flex-direction: column;
}

.modal-button {
    padding: 12px 24px;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    border: 1px solid var(--primary-color);
    color: var(--dark-bg);
    font-size: 14px;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.modal-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}

.modal-button:active {
    transform: translateY(0);
}

.menu-button {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.menu-button:hover {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .upload-container {
        padding: 40px 30px;
        border-radius: 15px;
    }

    .upload-title {
        font-size: 36px;
    }

    .upload-label {
        font-size: 13px;
    }

    .modal-content {
        padding: 30px 20px;
        border-radius: 15px;
    }

    .modal-title {
        font-size: 28px;
    }

    .hud {
        padding: 15px 20px;
    }
}

@media (max-width: 480px) {
    .upload-container {
        padding: 30px 20px;
    }

    .upload-title {
        font-size: 28px;
    }

    .upload-label {
        padding: 10px 12px;
        font-size: 12px;
    }

    .start-button {
        padding: 12px 20px;
        font-size: 14px;
    }

    .modal-content {
        padding: 20px;
    }

    .modal-title {
        font-size: 24px;
        margin-bottom: 15px;
    }

    .modal-stats {
        gap: 10px;
        padding: 15px;
        margin-bottom: 20px;
    }

    .stat-value {
        font-size: 20px;
    }
}