:root {
    --primary-bg: #f3f4f6;
    --white: #ffffff;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --blue-100: #dbeafe;
    --blue-800: #1e40af;
    --yellow-100: #fef3c7;
    --yellow-800: #92400e;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--primary-bg);
    min-height: 100vh;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.calendar-header h1 {
    font-size: 1.875rem;
    font-weight: bold;
    color: var(--gray-800);
}

.calendar-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: 0.375rem;
    cursor: pointer;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.btn:hover {
    background-color: var(--gray-200);
}

.navigation-buttons {
    display: flex;
    gap: 0.5rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(3, 30%);
    gap: 2rem;
    justify-content: center;
}

.month-container {
    background-color: var(--white);
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-300);
}

.month-header {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.month-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    text-align: center;
}

.month-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--gray-300);
}

.month-column {
    display: flex;
    flex-direction: column;
}

.month-column:not(:last-child) {
    border-right: 1px solid var(--gray-300);
}

.day {
    padding: 0.75rem;
    min-height: 5rem;
    border-bottom: 1px solid var(--gray-300);
    position: relative;
}

.day:last-child {
    border-bottom: none;
}

.day-info {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    color: var(--gray-700);
}

.day-number {
    font-size: 0.875rem;
    font-weight: 500;
}

.week-day {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.event {
    margin-top: 0.5rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 0.25rem;
    cursor: pointer;
}

.event.confirmed {
    background-color: var(--blue-100);
    color: var(--blue-800);
}

.event.unconfirmed {
    background-color: var(--yellow-100);
    color: var(--yellow-800);
}

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 50;
}

.modal[style*="display: flex"] {
    display: flex !important;
}

.modal-content {
    background-color: var(--white);
    border-radius: 0.5rem;
    max-width: 28rem;
    width: 100%;
    margin: 1rem;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.btn-close {
    padding: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-600);
}

.btn-close:hover {
    color: var(--gray-800);
}

.event-details {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.detail-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
}

.detail-group p {
    margin-top: 0.25rem;
}

@media (max-width: 768px) {
    .calendar-grid {
        grid-template-columns: 95%;
        gap: 1rem;
    }
    
    .calendar-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .calendar-controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .day {
        min-height: 4rem;
        padding: 0.5rem;
    }
}