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

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --accent-color: #4a9eff;
    --accent-hover: #3d8de6;
    --highlight-current: #2d5a2d;
    --highlight-reference: #4a4a2d;
    --day-change: #3a3a3a;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.header-controls {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.control-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

input[type="text"],
select {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.95rem;
    min-width: 150px;
}

input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-color);
}

select {
    cursor: pointer;
}

main {
    padding: 2rem;
}

#tableContainer {
    width: 100%;
}

.table-wrapper {
    overflow-x: auto;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

thead {
    background-color: var(--bg-tertiary);
    position: sticky;
    top: 0;
}

th {
    padding: 0.75rem 0.5rem;
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

th.clickable {
    cursor: pointer;
    transition: background-color 0.2s;
}

th.clickable:hover {
    background-color: var(--bg-secondary);
}

td {
    padding: 0.75rem 0.5rem;
    text-align: center;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

td.name-cell {
    text-align: left;
    font-weight: 500;
    position: sticky;
    left: 0;
    background-color: var(--bg-secondary);
    z-index: 10;
    min-width: 150px;
}

td.timezone-cell {
    text-align: left;
    font-size: 0.85rem;
    color: var(--text-secondary);
    position: sticky;
    left: 150px;
    background-color: var(--bg-secondary);
    z-index: 10;
    min-width: 200px;
}

td.time-cell {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
}

td.current-time {
    background-color: var(--highlight-current);
    font-weight: 600;
}

td.reference-time {
    background-color: var(--highlight-reference);
}

td.day-change {
    background-color: var(--day-change);
    opacity: 0.7;
}

td.actions-cell {
    white-space: nowrap;
}

.action-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    font-size: 0.85rem;
    transition: color 0.2s;
}

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

.action-btn.delete {
    color: var(--danger-color);
}

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

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 2rem;
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.modal-body label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.modal-body input {
    width: 100%;
}

.modal-timezone-info {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.btn-primary,
.btn-secondary {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

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

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    .header-content h1 {
        font-size: 1.25rem;
    }

    .header-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .control-group {
        width: 100%;
    }

    input[type="text"],
    select {
        width: 100%;
        min-width: unset;
    }

    main {
        padding: 1rem;
    }

    .modal-content {
        padding: 1.5rem;
    }

    th,
    td {
        padding: 0.5rem 0.25rem;
        font-size: 0.8rem;
    }

    td.name-cell {
        min-width: 100px;
    }

    td.timezone-cell {
        left: 100px;
        min-width: 150px;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.1rem;
    }

    th,
    td {
        font-size: 0.75rem;
        padding: 0.4rem 0.2rem;
    }

    .modal-actions {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
}