:root {
    /* Phoenix Monochrome - Light Mode */
    --bg-primary: #F9FAFB;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F3F4F6;
    --bg-sidebar: #000000;
    
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #9CA3AF;
    
    --border-primary: #E5E7EB;
    
    --accent-color: #000000;
    
    /* Functional Colors */
    --status-pending: #D97706;
    --status-pending-bg: rgba(251, 191, 36, 0.1);
    --status-approved: #059669;
    --status-approved-bg: rgba(52, 211, 153, 0.1);
    --status-denied: #DC2626;
    --status-denied-bg: rgba(248, 113, 113, 0.1);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-tertiary: #1F1F1F;
    --bg-sidebar: #050505;

    --text-primary: #FFFFFF;
    --text-secondary: #D1D5DB;
    --text-tertiary: #6B7280;
    
    --border-primary: #333333;
    --accent-color: #FFFFFF;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
    overflow: hidden;
    letter-spacing: -0.01em;
}

/* --- COMPONENTS --- */

/* Glass Cards */
.card, .modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
    border-radius: 0.75rem;
    transition: all 0.2s ease;
}

.card:hover {
    border-color: var(--text-secondary);
    box-shadow: var(--shadow-md);
}

/* Sidebar */
#sidebar {
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-primary);
}

.sidebar-link {
    display: flex; align-items: center; justify-content: center;
    border-radius: 12px;
    color: var(--text-tertiary);
    transition: all 0.2s;
    width: 48px; height: 48px; margin: 0 auto 0.5rem auto;
}

.sidebar-link:hover { color: #FFFFFF; background-color: rgba(255,255,255,0.1); }
.sidebar-link.active { background-color: #FFFFFF; color: #000000; box-shadow: 0 0 15px rgba(255,255,255,0.2); }

/* Tooltips */
.sidebar-link .tooltip {
    position: absolute; left: 100%; top: 50%; transform: translateY(-50%);
    margin-left: 15px; padding: 6px 12px;
    background-color: #000; color: #FFF;
    border-radius: 4px; font-size: 0.75rem; font-weight: 700;
    opacity: 0; visibility: hidden; transition: 0.2s; pointer-events: none; z-index: 50;
}
.sidebar-link:hover .tooltip { opacity: 1; visibility: visible; }

/* Flight Path Animation (Restored & Modernized) */
.flight-path {
    position: relative;
    width: 100%;
    height: 2px;
    background-color: var(--bg-tertiary);
    margin-top: 1.5rem;
    border-radius: 99px;
}
.flight-progress {
    position: absolute;
    height: 100%;
    background-color: var(--text-primary);
    border-radius: 99px;
    transition: width 1s ease-in-out;
}
.plane-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
    color: var(--text-primary);
    transition: left 1s ease-in-out;
    background: var(--bg-secondary);
    padding: 2px;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Modals */
.modal-backdrop {
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s;
}
.modal-backdrop.visible { opacity: 1; pointer-events: auto; }

.modal-content {
    transform: scale(0.95); opacity: 0; transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-backdrop.visible .modal-content { transform: scale(1); opacity: 1; }

/* Custom Inputs for Modals (Sleek Look) */
.modal-input {
    background-color: var(--bg-tertiary);
    border: 1px solid transparent;
    transition: all 0.2s;
}
.modal-input:focus {
    background-color: var(--bg-secondary);
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px rgba(0,0,0,0.05);
    outline: none;
}

/* Calendar */
.calendar-day.today {
    background-color: var(--bg-secondary);
    border: 2px solid var(--text-primary);
}
.calendar-day.today div:first-child {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 50%;
    width: 24px; height: 24px;
    display: flex; justify-content: center; align-items: center;
}

/* Scrollbar */
.custom-scrollbar::-webkit-scrollbar { width: 5px; }
.custom-scrollbar::-webkit-scrollbar-track { background: transparent; }
.custom-scrollbar::-webkit-scrollbar-thumb { background: var(--border-primary); border-radius: 10px; }
.custom-scrollbar::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* Switches */
.theme-switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.theme-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--bg-tertiary); transition: .4s; border-radius: 34px; border: 1px solid var(--border-primary); }
.slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 2px; bottom: 2px; background-color: var(--text-secondary); transition: .4s; border-radius: 50%; }
input:checked + .slider:before { transform: translateX(20px); background-color: var(--text-primary); }

/* Animations */
.view {
    transition: opacity 0.3s, transform 0.3s;
    animation: fadeIn 0.4s ease-out forwards;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.view.hidden { display: none; }