/* === Root Variables - Chess Theme === */
:root {
    --color-primary: #1a1a1a;
    --color-secondary: #2d2d2d;
    --color-accent: #4a4a4a;
    --color-light: #e8e8e8;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    --color-new-pairing: #00ff88;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    --border-radius: 8px;
    --transition-speed: 0.2s;
}

/* === Global Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-light);
    min-height: 100vh;
    line-height: 1.6;
}

/* === Header === */
header {
    background: var(--color-black);
    padding: var(--spacing-lg);
    text-align: center;
    border-bottom: 3px solid var(--color-accent);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-white);
}

.subtitle {
    color: var(--color-light);
    font-size: 1rem;
    opacity: 0.9;
}

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* === Screen Management === */
.screen {
    min-height: calc(100vh - 120px);
}

/* === Buttons === */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-speed);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.btn-primary:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn-secondary:hover {
    background: #5a5a5a;
    transform: translateY(-2px);
}

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

.btn-warning:hover {
    background: #e0a800;
}

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

.btn-danger:hover {
    background: #c82333;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

/* === Action Buttons Section === */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

/* === Tournament List === */
.tournament-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.tournament-card {
    background: var(--color-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-accent);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.tournament-card:hover {
    border-color: var(--color-success);
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

.tournament-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.tournament-card p {
    color: var(--color-light);
    opacity: 0.8;
    font-size: 0.9rem;
}

.tournament-card-actions {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
}

/* === Tournament Screen === */
.tournament-header {
    background: var(--color-black);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    border-bottom: 2px solid var(--color-accent);
}

.tournament-header h2 {
    flex: 1;
    color: var(--color-white);
}

.tournament-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* === Three Column Layout === */
.three-column-layout {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    max-width: 1800px;
    margin: 0 auto;
}

.column {
    background: var(--color-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    border: 2px solid var(--color-accent);
    display: flex;
    flex-direction: column;
    min-height: 500px;
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-accent);
}

.column-header h3 {
    color: var(--color-white);
}

/* === Player List === */
.import-export-players {
    margin-bottom: var(--spacing-md);
}

.player-list {
    flex: 1;
    overflow-y: auto;
}

.player-item {
    background: var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-accent);
    transition: all var(--transition-speed);
}

.player-item:hover {
    border-color: var(--color-success);
}

.player-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.player-rank {
    font-weight: bold;
    color: var(--color-warning);
    margin-right: var(--spacing-sm);
}

.player-name {
    flex: 1;
    font-weight: 600;
    color: var(--color-white);
}

.player-score {
    font-weight: bold;
    color: var(--color-success);
}

.player-details {
    font-size: 0.875rem;
    color: var(--color-light);
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

.player-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.player-item.afwezig {
    opacity: 0.5;
    border-color: var(--color-danger);
}

/* === Available Players === */
.filter-section {
    margin-bottom: var(--spacing-md);
}

.filter-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-accent);
    border-radius: var(--border-radius);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 1rem;
}

.filter-input:focus {
    outline: none;
    border-color: var(--color-success);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    cursor: pointer;
    color: var(--color-light);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.available-players-list {
    flex: 1;
    overflow-y: auto;
}

.available-player-item {
    background: var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-accent);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.available-player-item:hover {
    border-color: var(--color-info);
}

.available-player-item.selected {
    border-color: var(--color-success);
    background: rgba(40, 167, 69, 0.2);
}

/* === Pairings List === */
.pairings-list {
    flex: 1;
    overflow-y: auto;
}

.pairing-item {
    background: var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-accent);
    transition: all var(--transition-speed);
}

.pairing-item.new-pairing {
    border-color: var(--color-new-pairing);
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.pairing-item.completed {
    opacity: 0.7;
}

.pairing-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.pairing-round {
    font-size: 0.875rem;
    color: var(--color-warning);
    font-weight: bold;
}

.pairing-players {
    margin-bottom: var(--spacing-sm);
}

.pairing-player {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

.color-indicator {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
}

.color-indicator.white {
    background: var(--color-white);
}

.color-indicator.black {
    background: var(--color-black);
}

.pairing-result-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-xs);
}

.pairing-result {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-accent);
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: bold;
}

/* === Modal === */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-secondary);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-accent);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 2px solid var(--color-accent);
}

.modal-header h3 {
    color: var(--color-white);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-light);
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-danger);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 2px solid var(--color-accent);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* === Form Elements === */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-light);
    font-weight: 600;
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--color-light);
    opacity: 0.7;
    font-size: 0.875rem;
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-accent);
    border-radius: var(--border-radius);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 1rem;
}

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

/* === History List === */
.history-list {
    max-height: 400px;
    overflow-y: auto;
}

.history-item {
    background: var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-accent);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-weight: bold;
}

.history-item-details {
    font-size: 0.875rem;
    color: var(--color-light);
    opacity: 0.8;
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-light);
    opacity: 0.6;
}

/* === Copy Players Modal === */
.copy-player-item {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-accent);
    transition: background var(--transition-speed);
}

.copy-player-item:last-child {
    border-bottom: none;
}

.copy-player-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.copy-player-item .checkbox-label {
    margin: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    width: 100%;
}

.copy-player-item .checkbox-label input[type="checkbox"] {
    margin-right: var(--spacing-sm);
}

/* === Responsive Design === */
@media (max-width: 1200px) {
    .three-column-layout {
        grid-template-columns: 1fr 1fr;
    }

    .column-right {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .tournament-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .three-column-layout {
        grid-template-columns: 1fr;
        padding: var(--spacing-sm);
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }

    .tournament-actions {
        width: 100%;
    }

    .tournament-actions .btn {
        flex: 1;
    }
}

/* === Additional UI Elements === */
.btn-icon {
    background: none;
    border: none;
    color: var(--color-light);
    cursor: pointer;
    font-size: 1.2rem;
    padding: var(--spacing-xs);
    transition: all var(--transition-speed);
}

.btn-icon:hover {
    color: var(--color-success);
    transform: scale(1.2);
}

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

.btn-result {
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: bold;
    transition: all var(--transition-speed);
}

.btn-result:hover {
    background: var(--color-success);
    transform: scale(1.05);
}

.btn-delete {
    background: var(--color-danger);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    transition: all var(--transition-speed);
}

.btn-delete:hover {
    background: #a71d2a;
    transform: rotate(90deg);
}

.btn-block {
    width: 100%;
    display: block;
}

.empty-message {
    text-align: center;
    color: var(--color-light);
    opacity: 0.6;
    padding: var(--spacing-xl);
    font-style: italic;
}

.player-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.player-item .player-info {
    flex: 1;
    margin-bottom: 0;
}

.player-class {
    font-size: 0.75rem;
    color: var(--color-info);
    font-weight: normal;
}

.available-player {
    background: var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-accent);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.available-player:hover {
    border-color: var(--color-info);
}

.available-player.selected {
    border-color: var(--color-success);
    background: rgba(40, 167, 69, 0.2);
}

.pairing {
    background: var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-accent);
}

.pairing.new {
    border-color: var(--color-new-pairing);
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 10px rgba(0, 255, 136, 0.3); }
    50% { box-shadow: 0 0 20px rgba(0, 255, 136, 0.5); }
}

.pairing.finished {
    opacity: 0.7;
}

.pairing-info {
    margin-bottom: var(--spacing-sm);
}

.pairing-round {
    font-size: 0.75rem;
    color: var(--color-warning);
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
}

.pairing-white,
.pairing-black {
    padding: var(--spacing-xs) 0;
}

.pairing-results {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.pairing-result-display {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--color-accent);
    border-radius: var(--border-radius);
    font-weight: bold;
    color: var(--color-success);
}

.tournament-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.tournament-card-body {
    margin-bottom: var(--spacing-md);
}

.tournament-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    opacity: 0.8;
}

.history-item {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: var(--spacing-sm);
    align-items: center;
}

.history-round {
    font-size: 0.75rem;
    color: var(--color-warning);
    font-weight: bold;
}

.history-opponent {
    color: var(--color-white);
}

.history-result {
    font-weight: bold;
    color: var(--color-success);
}

.history-date {
    font-size: 0.75rem;
    color: var(--color-light);
    opacity: 0.6;
}

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

::-webkit-scrollbar-track {
    background: var(--color-primary);
}

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

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

/* ========================================
   CSV IMPORT HELP
   ======================================== */

.csv-help-container {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.import-export-players {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon-help {
    background: none;
    border: 2px solid #007bff;
    color: #007bff;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.2s;
    border-radius: 50%;
    line-height: 1;
}

.btn-icon-help:hover {
    background: #007bff;
    color: white;
    transform: scale(1.1);
}

.csv-help-popup {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 1000;
    margin-top: 8px;
    max-width: 500px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.8);
    animation: slideDown 0.2s ease-out;
}

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

.help-box {
    background: #2a2a2a;
    border: 1px solid #4a4a4a;
    border-radius: 4px;
    padding: 16px;
    margin-top: 12px;
    text-align: left;
}

.help-box h4 {
    color: #007bff;
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 16px;
}

.help-box ol {
    margin: 8px 0;
    padding-left: 20px;
}

.help-box li {
    margin: 4px 0;
}

.csv-example {
    background: #1a1a1a;
    border: 1px solid #4a4a4a;
    border-radius: 4px;
    padding: 12px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    overflow-x: auto;
    margin: 12px 0;
    color: #00ff00;
}

.help-notes {
    background: rgba(0, 123, 255, 0.1);
    border-left: 3px solid #007bff;
    padding: 12px;
    margin: 12px 0;
}

.help-notes ul {
    margin: 8px 0 0 0;
    padding-left: 20px;
}

.help-notes li {
    margin: 4px 0;
}

.help-notes code {
    background: #1a1a1a;
    padding: 2px 5px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}