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

:root {
    --black: #1a1a1a;
    --dark-gray: #333333;
    --medium-gray: #666666;
    --gray: #999999;
    --light-gray: #e5e5e5;
    --lighter-gray: #f5f5f5;
    --white: #ffffff;
    --accent: #2d2d2d;
    --border: #d1d1d1;
    --shadow: rgba(0, 0, 0, 0.08);
    --shadow-hover: rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--white);
    color: var(--black);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--light-gray);
}

.title {
    font-size: 48px;
    font-weight: 300;
    letter-spacing: 8px;
    color: var(--black);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    color: var(--gray);
    letter-spacing: 4px;
    text-transform: uppercase;
}

.main-content {
    flex: 1;
}

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 40px;
    margin-bottom: 20px;
}

.card-title {
    font-size: 24px;
    font-weight: 400;
    color: var(--black);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--light-gray);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--medium-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 1px solid var(--border);
    border-radius: 2px;
    background: var(--white);
    color: var(--black);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input:focus {
    outline: none;
    border-color: var(--black);
    box-shadow: 0 0 0 2px var(--shadow-hover);
}

.input::placeholder {
    color: var(--gray);
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: 1px solid var(--black);
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.2s ease;
    background: transparent;
}

.btn-primary {
    background: var(--black);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--dark-gray);
    border-color: var(--dark-gray);
}

.btn-secondary {
    background: transparent;
    color: var(--black);
}

.btn-secondary:hover {
    background: var(--lighter-gray);
}

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

.btn-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hidden {
    display: none !important;
}

.room-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 20px;
    background: var(--lighter-gray);
    border-radius: 2px;
    margin-bottom: 30px;
}

.room-code {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: 6px;
    color: var(--black);
    font-family: 'Courier New', monospace;
}

.player-list {
    margin-bottom: 30px;
}

.player-list h3 {
    font-size: 12px;
    color: var(--medium-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.player-list ul {
    list-style: none;
}

.player-list li {
    padding: 12px 16px;
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    align-items: center;
    gap: 12px;
}

.player-list li:last-child {
    border-bottom: none;
}

.player-type-badge {
    font-size: 10px;
    padding: 4px 8px;
    border-radius: 2px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.player-type-badge.human {
    background: var(--black);
    color: var(--white);
}

.player-type-badge.ai {
    background: var(--light-gray);
    color: var(--medium-gray);
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--light-gray);
}

.game-header .card-title {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.timer {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.timer-value {
    font-size: 48px;
    font-weight: 300;
    color: var(--black);
    font-family: 'Courier New', monospace;
}

.timer-label {
    font-size: 14px;
    color: var(--gray);
}

.instruction {
    text-align: center;
    color: var(--medium-gray);
    margin-bottom: 30px;
    font-size: 14px;
}

.positions-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    margin-bottom: 30px;
}

.position-cell {
    aspect-ratio: 1;
    border: 1px solid var(--border);
    border-radius: 2px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--white);
    position: relative;
}

.position-cell:hover:not(.occupied):not(.eliminated) {
    border-color: var(--black);
    background: var(--lighter-gray);
}

.position-cell.selected {
    border-color: var(--black);
    background: var(--black);
    color: var(--white);
}

.position-cell.occupied {
    background: var(--lighter-gray);
    cursor: not-allowed;
}

.position-cell.occupied .position-player {
    font-size: 11px;
    color: var(--medium-gray);
}

.position-cell.eliminated {
    background: var(--light-gray);
    border-color: var(--light-gray);
    cursor: not-allowed;
    opacity: 0.6;
}

.position-cell.catch-animation {
    animation: catchPulse 0.5s ease;
}

@keyframes catchPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
        border-color: var(--black);
        background: var(--light-gray);
    }
}

.position-number {
    font-size: 20px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 4px;
}

.position-cell.selected .position-number {
    color: var(--white);
}

.position-player {
    font-size: 10px;
    color: var(--gray);
    text-align: center;
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.status-bar {
    text-align: center;
    padding: 16px;
    background: var(--lighter-gray);
    border-radius: 2px;
    color: var(--medium-gray);
    font-size: 14px;
}

.status-bar strong {
    color: var(--black);
}

.catch-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.catch-label {
    font-size: 12px;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.catch-indicator::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--black);
    border-radius: 50%;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.3;
    }
}

.survivors-panel {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--light-gray);
}

.survivors-panel h3 {
    font-size: 12px;
    color: var(--medium-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.survivors-panel ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.survivors-panel li {
    padding: 8px 16px;
    background: var(--lighter-gray);
    border-radius: 2px;
    font-size: 13px;
    color: var(--black);
}

.survivors-panel li.eliminated {
    text-decoration: line-through;
    opacity: 0.5;
}

.catch-log {
    margin-top: 20px;
    padding: 16px;
    background: var(--lighter-gray);
    border-radius: 2px;
    max-height: 150px;
    overflow-y: auto;
}

.catch-log-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--medium-gray);
}

.catch-log-item:last-child {
    border-bottom: none;
}

.catch-log-item .position {
    font-weight: 600;
    color: var(--black);
}

.result-card {
    text-align: center;
}

.winner-display {
    padding: 40px;
    margin-bottom: 30px;
    background: var(--lighter-gray);
    border-radius: 2px;
}

.winner-label {
    display: block;
    font-size: 12px;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.winner-name {
    font-size: 36px;
    font-weight: 300;
    color: var(--black);
    letter-spacing: 2px;
}

.footer {
    text-align: center;
    padding-top: 30px;
    margin-top: 50px;
    border-top: 1px solid var(--light-gray);
    color: var(--gray);
    font-size: 12px;
}

.notification {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    padding: 16px 32px;
    background: var(--black);
    color: var(--white);
    border-radius: 2px;
    font-size: 14px;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translate(-50%, 20px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

@media (max-width: 600px) {
    .container {
        padding: 20px 16px;
    }
    
    .title {
        font-size: 32px;
        letter-spacing: 4px;
    }
    
    .card {
        padding: 24px;
    }
    
    .positions-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 8px;
    }
    
    .position-number {
        font-size: 16px;
    }
    
    .position-player {
        font-size: 9px;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}