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

body {
    font-family: 'Times New Roman', Times, serif;
    background-color: #000000;
    color: #FFFFFF;
    height: 100vh;
    overflow: hidden;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 48px;
    background-color: #1A1A1A;
    border-bottom: 1px solid #2A2A2A;
    flex-shrink: 0;
}

.header-left h1 {
    font-size: 32px;
    font-weight: normal;
    letter-spacing: 1.5px;
}

.header-center .month-year {
    font-size: 28px;
    font-weight: normal;
}

.header-right {
    display: flex;
    gap: 12px;
}

.nav-btn {
    background-color: #3A3A3A;
    color: #FFFFFF;
    border: none;
    width: 56px;
    height: 56px;
    font-size: 24px;
    font-weight: normal;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.nav-btn:hover {
    background-color: #2A2A2A;
    transform: translateY(-1px);
}

.nav-btn:active {
    transform: translateY(0);
    background-color: #1A1A1A;
}

/* Calendar Main */
.calendar-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 48px;
    overflow: auto;
    gap: 24px;
}

.weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    font-size: 18px;
    font-weight: normal;
    text-align: center;
}

.weekday {
    color: #3A3A3A;
    padding: 12px 0;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    min-height: 0;
    opacity: 1;
    transition: opacity 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.date-cell {
    aspect-ratio: 1;
    background-color: #2A2A2A;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: normal;
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    border-radius: 8px;
    position: relative;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 2px solid transparent;
}

.date-cell:hover {
    background-color: #3A3A3A;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.05);
}

.date-cell:active {
    transform: translateY(0);
}

.date-cell.selected {
    background-color: #FFFFFF;
    color: #000000;
    border-color: #3A3A3A;
    box-shadow: 0 0 0 2px #FFFFFF;
    transform: scale(1.02);
}

.date-cell.today {
    border-color: #FFFFFF;
    box-shadow: inset 0 0 0 1px #FFFFFF;
}

.date-cell.today.selected {
    border-color: #000000;
}

.date-cell.today:hover {
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1), inset 0 0 0 1px #FFFFFF;
}

.date-cell.has-events::after {
    content: '';
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 6px;
    height: 6px;
    background-color: #FFFFFF;
    border-radius: 50%;
    box-shadow: 0 0 0 1px #000000;
}

.date-cell.empty {
    background-color: transparent;
    cursor: default;
}

.date-cell.empty:hover {
    background-color: transparent;
    transform: none;
    box-shadow: none;
}

/* Event Panel */
.event-panel {
    width: 420px;
    background: linear-gradient(180deg, #1A1A1A 0%, #000000 100%);
    border-left: 1px solid #2A2A2A;
    padding: 48px 36px;
    flex-shrink: 0;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #3A3A3A #1A1A1A;
}

.event-panel::-webkit-scrollbar {
    width: 6px;
}

.event-panel::-webkit-scrollbar-track {
    background: #1A1A1A;
}

.event-panel::-webkit-scrollbar-thumb {
    background: #3A3A3A;
    border-radius: 3px;
}

.event-panel.active {
    opacity: 1;
    transform: translateX(0);
}

.no-events {
    text-align: center;
    color: #3A3A3A;
    padding: 60px 24px;
    font-style: italic;
}

.event-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid #2A2A2A;
}

.event-panel-header h2 {
    font-size: 24px;
    font-weight: normal;
    margin: 0;
}

.close-btn {
    background: #2A2A2A;
    border: none;
    color: #3A3A3A;
    font-size: 28px;
    cursor: pointer;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background-color: #3A3A3A;
    color: #FFFFFF;
    transform: scale(1.05);
}

.close-btn:active {
    transform: scale(0.98);
}

.events-list {
    max-height: 320px;
    margin-bottom: 36px;
    transition: all 0.2s ease;
}

.events-list.events-updated {
    transform: scale(0.98);
}

.event-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    background-color: #2A2A2A;
    margin-bottom: 12px;
    border-radius: 8px;
    font-size: 18px;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: default;
}

.event-item:hover {
    background-color: #3A3A3A;
    transform: translateX(2px);
}

.event-item .delete-event {
    background-color: transparent;
    border: none;
    color: #3A3A3A;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    margin-left: 12px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.event-item .delete-event:hover {
    background-color: #FFFFFF;
    color: #000000;
    transform: scale(1.1);
}

.event-item .delete-event:active {
    transform: scale(0.95);
}

.add-event-section {
    display: flex;
    gap: 12px;
    padding-top: 24px;
    border-top: 1px solid #2A2A2A;
}

#new-event-input {
    flex: 1;
    background-color: #2A2A2A;
    border: 2px solid #3A3A3A;
    color: #FFFFFF;
    padding: 18px 20px;
    font-size: 18px;
    border-radius: 8px;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    touch-action: manipulation;
}

#new-event-input:focus {
    outline: none;
    border-color: #FFFFFF;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    background-color: #3A3A3A;
}

#new-event-input::placeholder {
    color: #3A3A3A;
}

#add-event-btn {
    background-color: #3A3A3A;
    color: #FFFFFF;
    border: none;
    padding: 18px 32px;
    font-size: 18px;
    font-family: 'Times New Roman', Times, serif;
    font-weight: normal;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    white-space: nowrap;
    min-width: 80px;
}

#add-event-btn:hover {
    background-color: #2A2A2A;
    transform: translateY(-1px);
}

#add-event-btn:active {
    transform: translateY(0);
}

/* Footer */
.footer {
    padding: 24px 48px;
    background-color: #1A1A1A;
    border-top: 1px solid #2A2A2A;
    flex-shrink: 0;
}

.ecosystem-link {
    color: #3A3A3A;
    text-decoration: none;
    font-size: 18px;
    transition: color 0.25s ease;
}

.ecosystem-link:hover {
    color: #FFFFFF;
}

/* Mobile Perfect */
@media (max-width: 1024px) {
    .header {
        padding: 20px 32px;
    }
    
    .calendar-main {
        padding: 32px;
    }
    
    .event-panel {
        width: 360px;
    }
}

@media (max-width: 768px) {
    body.modal-open {
        overflow: hidden;
    }
    
    .header {
        padding: 20px 24px;
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .header-left h1 {
        font-size: 28px;
    }
    
    .header-right {
        order: -1;
    }
    
    .calendar-main {
        padding: 24px 20px;
        gap: 20px;
    }
    
    .event-panel {
        position: fixed;
        inset: 0;
        width: 100%;
        height: 100%;
        z-index: 1000;
        padding: 40px 24px;
        transform: translateX(100%);
        border-left: none;
    }
    
    .event-panel.active {
        transform: translateX(0);
    }
    
    .calendar-grid {
        gap: 2px;
    }
    
    .date-cell {
        font-size: 18px;
    }
    
    .weekdays {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 16px 20px;
    }
    
    .calendar-main {
        padding: 20px 16px;
    }
    
    .date-cell {
        font-size: 16px;
    }
    
    .nav-btn {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
}

/* Focus visible for accessibility */
@media (prefers-reduced-motion: no-preference) {
    * {
        scroll-behavior: smooth;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* High contrast support */
@media (prefers-contrast: high) {
    .date-cell {
        border-width: 3px;
    }
    
    .today {
        border-color: #FFFFFF !important;
        border-width: 3px !important;
    }
}