:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --success: #22c55e;
    --danger: #ef4444;
    --event-blue: #3b82f6;
    --event-purple: #a855f7;
    --event-green: #10b981;
    --event-orange: #f59e0b;
}

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

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1em;
    margin-bottom: 1em;
}

header {
    background: var(--surface);
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 30px;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

#timezone-display {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.btn-primary, .btn-secondary, .btn-nav {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: var(--surface-light);
    color: var(--text);
}

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

.btn-nav {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-nav:hover {
    background: var(--surface-light);
}

.calendar-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
}

#week-display {
    font-size: 1.1rem;
    font-weight: 600;
    min-width: 250px;
    text-align: center;
}

#calendar-container {
    background: var(--surface);
    border-radius: 8px;
    overflow: auto;
    border: 1px solid var(--border);
}

.calendar-grid {
    display: grid;
    grid-template-columns: 80px repeat(7, 1fr);
    position: relative;
    min-width: fit-content;
}

.time-column {
    background: var(--surface);
    border-right: 1px solid var(--border);
    position: sticky;
    left: 0;
    z-index: 20;
}

.time-label {
    height: 60px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 4px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.85rem;
    background: var(--surface);
}

.day-column {
    border-right: 1px solid var(--border);
    position: relative;
    min-width: 150px;
}

.day-column:last-child {
    border-right: none;
}

.day-header {
    background: var(--surface-light);
    padding: 15px;
    text-align: center;
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.time-header-spacer {
    background: var(--surface-light);
    padding: 15px;
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
    box-sizing: border-box;
}

.day-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.day-date {
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: 5px;
}

.day-content {
    position: relative;
    height: 1440px; /* 24 hours * 60px */
}

.hour-slot {
    height: 60px;
    border-bottom: 1px solid var(--border);
}

.current-time-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: #ef4444;
    z-index: 50;
    pointer-events: none;
}

.current-time-line::before {
    content: '';
    position: absolute;
    left: -6px;
    top: -4px;
    width: 10px;
    height: 10px;
    background: #ef4444;
    border-radius: 50%;
}

.event-block {
    position: absolute;
    background: var(--event-blue);
    border-radius: 4px;
    padding: 6px 8px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.2s;
    border-left: 3px solid rgba(255, 255, 255, 0.5);
    box-sizing: border-box;
}

.event-block:hover {
    transform: translateX(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.event-block.color-1 { background: var(--event-blue); }
.event-block.color-2 { background: var(--event-purple); }
.event-block.color-3 { background: var(--event-green); }
.event-block.color-4 { background: var(--event-orange); }

.event-thumbnail {
    width: 40px;
    height: 40px;
    background-size: cover;
    background-position: center;
    border-radius: 4px;
    float: left;
    margin-right: 8px;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.event-content {
    overflow: hidden;
}

.event-time {
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0.9;
    margin-bottom: 2px;
}

.event-title {
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.event-creator {
    font-size: 0.7rem;
    opacity: 0.8;
    margin-top: 2px;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    overflow-y: auto;
}

.modal-content {
    background: var(--surface);
    margin: 5% auto;
    padding: 30px;
    border-radius: 12px;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    border: 1px solid var(--border);
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
}

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

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-secondary);
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="datetime-local"],
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
}

select {
    cursor: pointer;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 25px;
}

#event-detail {
    padding: 10px 0;
}

.event-detail-header {
    display: flex;
    gap: 15px;
    align-items: flex-start;
    /* margin-bottom: 20px; */
}

.event-detail-thumbnail {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border-radius: 8px;
    flex-shrink: 0;
}

.event-detail-header-info {
    flex: 1;
    min-width: 0;
}

#event-detail h2 {
    margin: 0 0 0 0;
    color: var(--text);
}

#event-detail p {
    margin: 10px 0;
    color: var(--text-secondary);
}

#event-detail .event-detail-time {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
    margin: 0;
}

#event-detail .event-detail-image {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 8px;
    margin: 15px 0;
}

#event-detail .event-detail-banner {
    width: 100%;
    aspect-ratio: 5 / 1;
    object-fit: cover;
    border-radius: 8px;
    margin: 15px 0 0 0;
}

#event-detail a {
    color: var(--primary-color);
    text-decoration: none;
}

#event-detail a:hover {
    text-decoration: underline;
}

.event-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.event-actions button {
    flex: 1;
    padding: 12px 24px;
    font-size: 1rem;
}

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

.edit-event-btn:hover {
    background: var(--primary-hover);
}

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

.delete-event-btn:hover {
    background: #dc2626;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }

    .calendar-controls {
        flex-wrap: wrap;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .calendar-grid {
        overflow-x: auto;
    }
}

/* Loading state */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state h3 {
    margin-bottom: 10px;
    color: var(--text);
}