:root {
    /* Colors */
    --bg-dark: #0f111a;
    --bg-gradient: linear-gradient(135deg, #0f111a 0%, #1a1b2e 100%);
    --glass-bg: rgba(25, 27, 42, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    
    --accent-primary: #6366f1;
    --accent-primary-hover: #4f46e5;
    
    /* Event Colors */
    --type-vacation: #ec4899; /* Pink */
    --type-vacation-bg: rgba(236, 72, 153, 0.15);
    --type-business: #3b82f6; /* Blue */
    --type-business-bg: rgba(59, 130, 246, 0.15);
    --type-remote: #10b981; /* Green */
    --type-remote-bg: rgba(16, 185, 129, 0.15);
    --type-flex: #f59e0b; /* Orange */
    --type-flex-bg: rgba(245, 158, 11, 0.15);

    /* Utils */
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    padding: 20px;
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-lg);
}

/* Layout */
.app-container {
    width: 100%;
    max-width: 1400px;
    height: 90vh;
    display: flex;
    gap: 24px;
}

/* Sidebar */
.sidebar {
    width: 280px;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 24px;
    gap: 32px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-primary), #a855f7);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    color: white;
}

.brand h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Buttons */
.btn-primary {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* Filter List */
.filter-section h3, .upcoming-section h3 {
    font-size: 13px;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.legend-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.legend-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot-vacation { background: var(--type-vacation); box-shadow: 0 0 8px var(--type-vacation); }
.dot-business { background: var(--type-business); box-shadow: 0 0 8px var(--type-business); }
.dot-remote { background: var(--type-remote); box-shadow: 0 0 8px var(--type-remote); }
.dot-flex { background: var(--type-flex); box-shadow: 0 0 8px var(--type-flex); }

/* Upcoming List */
.upcoming-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.upcoming-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-right: 8px;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

.upcoming-item {
    padding: 12px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-primary);
    display: flex;
    flex-direction: column;
    gap: 6px;
    animation: fadeIn 0.3s ease;
}

.upcoming-item.type-vacation { border-left-color: var(--type-vacation); }
.upcoming-item.type-business { border-left-color: var(--type-business); }
.upcoming-item.type-remote { border-left-color: var(--type-remote); }
.upcoming-item.type-flex { border-left-color: var(--type-flex); }

.up-date { font-size: 12px; color: var(--text-secondary); }
.up-title { font-size: 14px; font-weight: 500; }
.up-meta { font-size: 12px; opacity: 0.8; }

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
}

.user-info .name { font-size: 14px; font-weight: 500; }
.user-info .role { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow: hidden;
}

.top-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 8px;
}

.header-left h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.header-left .subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

.month-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 16px;
    border-radius: 100px;
}

.month-nav h3 {
    font-size: 16px;
    font-weight: 600;
    min-width: 110px;
    text-align: center;
}

/* Calendar */
.calendar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    overflow: hidden;
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: right;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
}

.calendar-header div { padding-right: 12px; }

.calendar-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: 1fr;
    gap: 1px;
    padding-top: 16px;
    overflow-y: auto;
}

.day-cell {
    min-height: 100px;
    padding: 8px;
    border-right: 1px solid rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.03);
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: background var(--transition-fast);
}

.day-cell:hover { background: rgba(255,255,255,0.02); }
.day-cell.other-month { opacity: 0.3; }
.day-cell.today .day-num {
    background: var(--accent-primary);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-left: auto;
}

.day-num {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
    text-align: right;
    padding-right: 4px;
}

/* Event Chips in Calendar */
.event-chip {
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.event-chip:hover { transform: scale(1.02); }

.event-vacation { background: var(--type-vacation-bg); color: #fdf2f8; border-left: 2px solid var(--type-vacation); }
.event-business { background: var(--type-business-bg); color: #eff6ff; border-left: 2px solid var(--type-business); }
.event-remote { background: var(--type-remote-bg); color: #ecfdf5; border-left: 2px solid var(--type-remote); }
.event-flex { background: var(--type-flex-bg); color: #fffbeb; border-left: 2px solid var(--type-flex); }


/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-fast);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    width: 100%;
    max-width: 480px;
    padding: 32px;
    transform: translateY(20px);
    transition: var(--transition-fast);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 { font-size: 20px; }

.modal-form { display: flex; flex-direction: column; gap: 20px; }

.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

input, select, textarea {
    width: 100%;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border var(--transition-fast);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent-primary);
}

/* Chrome/Safari Calendar Icon color invert */
::-webkit-calendar-picker-indicator { filter: invert(1); opacity: 0.6; cursor: pointer; }

select option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 8px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
        overflow: visible;
    }
    .sidebar { width: 100%; height: auto; }
    .calendar-wrapper { min-height: 600px; }
    body { padding: 0; }
    .app-container { border-radius: 0; }
}