/* Reversi - Clean Minimal Design v3 */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

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

:root {
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #e5e5e5;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

body {
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    padding: 24px;
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Header */
header {
    background: var(--bg-secondary);
    padding: 20px 32px;
    border-radius: 0;
    margin-bottom: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--border);
}

header h1 {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 0.95em;
}

.user-info span {
    color: var(--text-secondary);
    font-weight: 400;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: 2px solid var(--text-primary);
    border-radius: 0;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: 'Space Grotesk', sans-serif;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-secondary);
    border-color: var(--text-primary);
}

.btn-primary:hover {
    background: transparent;
    color: var(--text-primary);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--text-primary);
    color: var(--bg-secondary);
}

.btn-success {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.btn-success:hover {
    background: transparent;
    color: var(--success);
}

.btn-danger {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

.btn-danger:hover {
    background: transparent;
    color: var(--danger);
}

.btn-small {
    padding: 6px 14px;
    font-size: 0.8em;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-box {
    background: var(--bg-secondary);
    padding: 48px;
    border: 2px solid var(--text-primary);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 32px;
    font-size: 1.8em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    margin-bottom: 32px;
    border: 2px solid var(--text-primary);
}

.tab-btn {
    padding: 12px;
    border: none;
    background: transparent;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85em;
    font-family: 'Space Grotesk', sans-serif;
}

.tab-btn:first-child {
    border-right: 2px solid var(--text-primary);
}

.tab-btn.active {
    background: var(--text-primary);
    color: var(--bg-secondary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

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

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    font-size: 1em;
    transition: all 0.2s;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Space Grotesk', sans-serif;
}

.form-group input:focus {
    outline: none;
    border-color: var(--text-primary);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

/* Main Menu */
.main-menu {
    background: var(--bg-secondary);
    padding: 48px;
    border: 2px solid var(--text-primary);
}

.main-menu h2 {
    margin-bottom: 32px;
    font-size: 1.4em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--text-primary);
    padding-bottom: 12px;
}

.main-menu h3 {
    margin-bottom: 20px;
    font-size: 1em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.game-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-bottom: 48px;
}

.join-game {
    margin-bottom: 48px;
    padding: 32px;
    background: var(--bg-primary);
    border: 2px solid var(--border);
}

.join-game form {
    display: flex;
    gap: 12px;
}

.join-game input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    font-size: 1em;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-family: 'Space Grotesk', sans-serif;
}

.join-game input:focus {
    outline: none;
    border-color: var(--text-primary);
}

.join-game input::placeholder {
    color: var(--text-secondary);
    letter-spacing: normal;
    text-transform: none;
}

/* Tables */
.recent-games {
    margin-top: 48px;
}

table {
    width: 100%;
    border-collapse: collapse;
    border: 2px solid var(--text-primary);
}

table th,
table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

table th {
    background: var(--text-primary);
    color: var(--bg-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8em;
    letter-spacing: 0.05em;
}

table tbody tr {
    background: var(--bg-secondary);
    transition: background 0.2s;
}

table tbody tr:hover {
    background: var(--bg-primary);
}

table td {
    color: var(--text-primary);
}

table tbody tr:last-child td {
    border-bottom: none;
}

/* Game Container */
.game-container {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 32px;
    background: var(--bg-secondary);
    padding: 48px;
    border: 2px solid var(--text-primary);
}

.game-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.players {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.player {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-primary);
    border: 2px solid var(--border);
    transition: all 0.2s;
}

.player.active {
    background: var(--bg-secondary);
    border-color: var(--text-primary);
    box-shadow: 4px 4px 0 var(--text-primary);
}

.player-piece {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--text-primary);
}

.player-piece.black {
    background: radial-gradient(circle at 35% 35%, #3f3f46, #000000);
}

.player-piece.white {
    background: radial-gradient(circle at 35% 35%, #ffffff, #e5e7eb);
}

.player-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.player-details strong {
    font-size: 1em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.score {
    color: var(--text-secondary);
    font-size: 0.85em;
    font-weight: 400;
}

/* Game Status */
.game-status {
    padding: 24px;
    background: var(--bg-primary);
    border: 2px solid var(--border);
    text-align: center;
}

.game-status.waiting {
    background: #fef3c7;
    border-color: var(--warning);
}

.game-status.waiting p {
    margin: 8px 0;
    color: #92400e;
    font-weight: 500;
}

.game-status.waiting strong {
    font-size: 1.5em;
    color: #b45309;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.15em;
}

.your-turn {
    color: var(--success);
    font-weight: 700;
    font-size: 1.4em;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.no-moves {
    color: var(--warning);
    font-weight: 700;
    font-size: 1.2em;
    text-transform: uppercase;
}

.game-status.finished {
    background: var(--text-primary);
    border-color: var(--text-primary);
    padding: 32px;
}

.game-status.finished h2 {
    margin-bottom: 16px;
    font-size: 1.8em;
    color: var(--bg-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.game-status.finished p {
    color: var(--bg-primary);
    font-size: 1.1em;
}

.winner {
    color: #10b981;
    font-size: 2.5em;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.loser {
    color: #ef4444;
    font-size: 2.5em;
    font-weight: 900;
    text-transform: uppercase;
}

.tie {
    color: #f59e0b;
    font-size: 2.5em;
    font-weight: 900;
    text-transform: uppercase;
}

/* Game Board - BRUTALIST DESIGN */
.board-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    min-height: 600px;
}

.board {
    border-collapse: separate;
    border-spacing: 2px;
    background: var(--text-primary);
    border: 4px solid var(--text-primary);
    padding: 2px;
    width: fit-content;
}

.board tr {
    height: 70px;
}

.cell {
    width: 70px;
    height: 70px;
    background: var(--bg-secondary);
    position: relative;
    cursor: default;
    transition: all 0.15s ease;
    padding: 0 !important;
    overflow: hidden;
    box-sizing: border-box;
    aspect-ratio: 1 / 1;
    vertical-align: top;
    border: 1px solid var(--border);
}

.cell.valid-move {
    cursor: pointer;
    background: var(--text-primary);
    position: relative;
}

.cell.valid-move:hover {
    background: #333333;
}

.cell.valid-move::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--bg-secondary);
}

.piece {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    will-change: transform;
    border: 3px solid var(--text-primary);
}

.piece.new-piece {
    animation: placePiece 0.2s ease forwards;
}

.piece.black {
    background: var(--text-primary);
}

.piece.white {
    background: var(--bg-secondary);
}

@keyframes placePiece {
    0% {
        transform: translate(-50%, -50%) scale(0);
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
    }
}

/* Messages */
.error {
    background: #fee2e2;
    color: #991b1b;
    padding: 16px 24px;
    border: 2px solid #ef4444;
    margin-bottom: 20px;
    font-weight: 500;
}

.message {
    padding: 16px 24px;
    margin-top: 20px;
    text-align: center;
    font-weight: 600;
    border: 2px solid;
}

.message.error {
    background: #fee2e2;
    color: #991b1b;
    border-color: #ef4444;
}

.message.success {
    background: #d1fae5;
    color: #065f46;
    border-color: #10b981;
}

/* Footer */
footer {
    text-align: center;
    padding: 24px;
    color: var(--text-secondary);
    margin-top: 32px;
    font-size: 0.9em;
    border-top: 1px solid var(--border);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .game-container {
        grid-template-columns: 1fr;
    }

    .board-wrapper {
        order: -1;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 16px;
        padding: 20px;
    }

    header h1 {
        font-size: 1.3em;
    }

    .board tr {
        height: 42px;
    }

    .cell {
        width: 42px;
        height: 42px;
    }

    .piece {
        width: 36px;
        height: 36px;
    }

    .game-options {
        grid-template-columns: 1fr;
    }

    .login-box {
        padding: 32px 24px;
    }

    .main-menu {
        padding: 32px 24px;
    }

    .game-container {
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .board tr {
        height: 36px;
    }

    .cell {
        width: 36px;
        height: 36px;
    }

    .piece {
        width: 30px;
        height: 30px;
    }

    .board {
        border-width: 4px;
        padding: 4px;
        border-spacing: 2px;
    }
}