:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-color: #111827;
    --card-bg: #1f2937;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --green: #10b981;
    --orange: #f59e0b;
    --red: #ef4444;
}

@keyframes flash {
    0% { background-color: rgba(59, 130, 246, 0.5); transform: scale(1.02); }
    100% { background-color: transparent; transform: scale(1); }
}

.flash-animation {
    animation: flash 0.5s ease-out;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    height: 60px;
}
.navbar h1 { font-size: 1.25rem; font-weight: 600; margin: 0; }

/* Buttons */
.btn {
    background-color: var(--card-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    transition: all 0.2s;
    font-size: 0.875rem;
}
.btn:hover { background-color: var(--border-color); }
.btn-primary { background-color: var(--primary-color); border-color: var(--primary-color); color: #fff; }
.btn-primary:hover { background-color: var(--primary-hover); }

/* Pages System */
.page { display: none; animation: fadeIn 0.3s ease; }
.page.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.hidden { display: none !important; }

/* Dropdown Menu */
.dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--card-bg);
    min-width: 200px;
    box-shadow: 0px 10px 25px rgba(0,0,0,0.5);
    z-index: 100;
    border: 1px solid var(--primary-color);
    border-radius: 0.5rem;
    margin-top: 0.5rem;
    overflow: hidden;
}
.dropdown-content .tab-btn {
    color: var(--text-main);
    padding: 16px 20px;
    text-decoration: none;
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    font-family: 'Inter', sans-serif;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s, padding-left 0.2s;
}
.dropdown-content .tab-btn:last-child { border-bottom: none; }
.dropdown-content .tab-btn:hover { background-color: rgba(59, 130, 246, 0.1); padding-left: 24px; color: var(--primary-color); }
.dropdown-content .tab-btn.active { color: var(--primary-color); font-weight: 600; background-color: rgba(59, 130, 246, 0.05); }

/* Alert Banner */
.alert-banner {
    background-color: rgba(245, 158, 11, 0.1);
    border: 1px solid var(--orange);
    color: var(--orange);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.alert-actions { display: flex; flex-direction: column; gap: 0.5rem; }

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}
.card-title { font-size: 0.875rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.5rem; }
.card-value { font-size: 1.75rem; font-weight: 700; }
.progress-bar-container { background-color: var(--border-color); border-radius: 9999px; height: 0.5rem; margin-top: 1rem; overflow: hidden; }
.progress-bar { height: 100%; background-color: var(--primary-color); transition: width 0.3s ease, background-color 0.3s ease; }
.progress-bar.overtime { background-color: var(--orange); }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-muted); font-size: 0.875rem; }
.search-input {
    width: 100%; background-color: #374151; color: var(--text-main);
    border: 1px solid transparent; padding: 0.5rem 0.75rem; border-radius: 0.375rem;
    font-family: 'Inter', sans-serif; outline: none; transition: border-color 0.2s; min-height: 44px;
}
.search-input:focus { border-color: var(--primary-color); }
.flex-row { display: flex; flex-direction: column; gap: 0.5rem; align-items: stretch; }
.recap-text { margin-top: 0.5rem; font-size: 0.875rem; color: var(--text-muted); }

/* Modals */
.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0, 0, 0, 0.7); display: flex; justify-content: center; align-items: flex-end; /* Bottom sheet style on mobile */
    opacity: 0; pointer-events: none; transition: opacity 0.3s; z-index: 200; backdrop-filter: blur(2px);
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal-content {
    background-color: var(--bg-color); border: 1px solid var(--border-color);
    border-radius: 1rem 1rem 0 0; width: 100%; max-width: 500px; padding: 1.5rem;
    max-height: 90vh; overflow-y: auto; transform: translateY(100%); transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.modal-overlay.active .modal-content { transform: translateY(0); }
.modal-header { display: flex; justify-content: space-between; align-items: center; }
.modal-close { background: none; border: none; color: var(--text-muted); font-size: 1.5rem; cursor: pointer; padding: 0.5rem; }
.modal-close:hover { color: var(--text-main); }

/* Schedule Settings */
.schedule-row { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; }
.schedule-row span { width: 40px; font-weight: 500; font-size: 0.875rem; }
.schedule-row input[type="checkbox"] { width: 1.5rem; height: 1.5rem; accent-color: var(--primary-color); cursor: pointer; flex-shrink: 0; }
.schedule-row .search-input { width: 100%; min-width: 80px; padding: 0.25rem 0.5rem; text-align: center; }

/* Calendar */
.calendar-days-header { display: grid; grid-template-columns: repeat(7, 1fr); text-align: center; font-size: 0.75rem; color: var(--text-muted); font-weight: 600; margin-bottom: 0.5rem; }
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal-day {
    background-color: var(--bg-color); border: 1px solid var(--border-color); aspect-ratio: 1;
    display: flex; justify-content: center; align-items: center; cursor: pointer; font-size: 1rem;
    border-radius: 50%; /* Circle for modern mobile look */
    transition: background-color 0.2s, color 0.2s, transform 0.1s; user-select: none;
    margin: 2px;
}
.cal-day:active { transform: scale(0.9); }
.cal-day.empty { background: transparent; border: none; cursor: default; }
.cal-day.today { border: 2px solid var(--text-main); font-weight: bold; }
.cal-day.missing { background-color: rgba(239, 68, 68, 0.2); border-color: var(--red); color: #fca5a5; }
.cal-day.worked { background-color: var(--green); color: white; border-color: var(--green); }
.cal-day.holiday { background-color: var(--primary-color); color: white; border-color: var(--primary-color); }
.cal-day.other { background-color: var(--orange); color: white; border-color: var(--orange); }

/* Responsive adjustments for larger screens */
@media (min-width: 768px) {
    .dashboard-grid { grid-template-columns: 1fr 1fr; }
    .dashboard-grid .card:first-child { grid-column: span 2; }
    .flex-row { flex-direction: row; align-items: flex-end; }
    .alert-banner { flex-direction: row; justify-content: space-between; align-items: center; }
    .alert-actions { flex-direction: row; }
    
    body { padding-top: 60px; } /* Add top navbar padding */
    .navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 100; }
    
    .modal-overlay { align-items: center; }
    .modal-content { border-radius: 0.75rem; transform: translateY(20px); }
    .modal-overlay.active .modal-content { transform: translateY(0); }
}