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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: rgb(0, 0, 0);
    margin-bottom: 30px;
    font-size: 2.5em;
}

.input-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 1em;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
}

#generateBtn {
    width: 100%;
    padding: 15px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

#generateBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

#generateBtn:active {
    transform: translateY(0);
}

.error {
    color: #e74c3c;
    margin-top: 15px;
    padding: 10px;
    background: #fadbd8;
    border-radius: 5px;
    font-size: 0.95em;
}

.hidden {
    display: none;
}

#simulation-root {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

#simulation-container {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
}

.floors-column {
    display: flex;
    flex-direction: column-reverse;
    flex-shrink: 0;
    min-width: 120px;
}

.floor {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    border-bottom: 2px solid #e0e0e0;
    padding: 0 10px;
    gap: 10px;
}

.floor:first-child {
    border-bottom: 3px solid #333;
}

.floor-label {
    width: 35px;
    font-weight: bold;
    font-size: 1.2em;
    color: #333;
    text-align: center;
    flex-shrink: 0;
}

.controls {
    display: flex;
    gap: 8px;
    flex-wrap: nowrap;
    align-items: center;
}

.direction-btn {
    width: 50px;
    height: 50px;
    cursor: pointer;
    border: 2px solid #999;
    background: #fff;
    border-radius: 8px;
    font-size: 1.2em;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.direction-btn:hover {
    background: #f0f0f0;
    transform: scale(1.05);
}

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

.direction-btn.active {
    background-color: #fdd835;
    border-color: #f9a825;
    box-shadow: 0 0 15px rgba(253, 216, 53, 0.6);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 15px rgba(253, 216, 53, 0.6);
    }
    50% {
        box-shadow: 0 0 25px rgba(253, 216, 53, 0.8);
    }
}

.shafts-container {
    display: flex;
    position: relative;
    background: linear-gradient(180deg, #f5f5f5 0%, #e0e0e0 100%);
    flex-shrink: 0;
    border: 2px solid #ccc;
    border-radius: 10px;
    overflow: hidden;
}

.shaft {
    width: 80px;
    height: 100%;
    border-right: 2px dashed #bbb;
    position: relative;
}

.shaft:last-child {
    border-right: none;
}

.floor-line {
    position: absolute;
    left: 0;
    right: 0;
    border-bottom: 2px solid #ccc;
    box-sizing: border-box;
    pointer-events: none;
}

.floor-line:first-child {
    border-bottom: 3px solid #666;
}

.lift {
    width: 60px;
    height: 80px;
    background: linear-gradient(135deg, #34495e 0%, #2c3e50 100%);
    position: absolute;
    left: 10px;
    bottom: 5px;
    border: 3px solid #1a252f;
    border-radius: 8px;
    box-sizing: border-box;
    overflow: hidden;
}

.lift.moving {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.5);
}

.lift-status-box {
    position: absolute;
    top: -28px;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: 0.85em;
    background: rgba(52, 73, 94, 0.95);
    color: white;
    padding: 4px 2px;
    border-radius: 5px;
    font-weight: bold;
    white-space: nowrap;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.door {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, #95a5a6 0%, #7f8c8d 100%);
    transition: transform 2.5s ease-in-out;
    z-index: 2;
}

.door.left {
    left: 0;
    border-right: 2px solid #34495e;
}

.door.right {
    right: 0;
    border-left: 2px solid #34495e;
}

.lift.doors-open .door.left {
    transform: translateX(-100%);
}

.lift.doors-open .door.right {
    transform: translateX(100%);
}

#simulation-container::-webkit-scrollbar {
    height: 10px;
}

#simulation-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 5px;
}

#simulation-container::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

#simulation-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    h1 {
        font-size: 1.8em;
        margin-bottom: 20px;
    }

    .input-section {
        padding: 20px;
    }

    .floor {
        height: 80px;
    }

    .floor-label {
        width: 30px;
        font-size: 1em;
    }

    .direction-btn {
        width: 45px;
        height: 45px;
        font-size: 1.1em;
    }

    .shaft {
        width: 70px;
    }

    .lift {
        width: 52px;
        height: 65px;
        left: 9px;
    }

    .lift-status-box {
        font-size: 0.75em;
        top: -26px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5em;
    }

    .input-section {
        padding: 15px;
    }

    .input-group input {
        padding: 10px;
    }

    #generateBtn {
        padding: 12px;
        font-size: 1em;
    }

    #simulation-root {
        padding: 10px;
    }

    #simulation-container {
        gap: 15px;
        padding: 10px 0;
    }

    .floors-column {
        min-width: 100px;
    }

    .floor {
        height: 70px;
        padding: 0 5px;
        gap: 5px;
    }

    .floor-label {
        width: 25px;
        font-size: 0.9em;
    }

    .controls {
        gap: 5px;
    }

    .direction-btn {
        width: 40px;
        height: 40px;
        font-size: 1em;
    }

    .shaft {
        width: 60px;
    }

    .lift {
        width: 45px;
        height: 55px;
        left: 7.5px;
    }

    .lift-status-box {
        font-size: 0.7em;
        top: -24px;
        padding: 3px 2px;
    }
}

@media (max-width: 360px) {
    .floor {
        height: 60px;
    }

    .floor-label {
        width: 20px;
        font-size: 0.8em;
    }

    .direction-btn {
        width: 36px;
        height: 36px;
        font-size: 0.95em;
    }

    .shaft {
        width: 55px;
    }

    .lift {
        width: 40px;
        height: 48px;
        left: 7.5px;
    }

    .lift-status-box {
        font-size: 0.65em;
        top: -22px;
    }
}