/* --- Base CSS Design System & Tokens --- */
:root {
    --bg-main: #0b0f19;
    --bg-card: rgba(17, 24, 39, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    
    /* Curated harmonious HSL color system */
    --primary: hsl(217, 91%, 60%);
    --primary-glow: hsla(217, 91%, 60%, 0.15);
    
    --success: hsl(142, 71%, 45%);
    --success-glow: hsla(142, 71%, 45%, 0.15);
    
    --warning: hsl(350, 89%, 60%);
    --warning-glow: hsla(350, 89%, 60%, 0.15);
    
    --accent: hsl(38, 92%, 50%);
    --accent-glow: hsla(38, 92%, 50%, 0.15);
    
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    
    --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --font-outfit: 'Outfit', -apple-system, sans-serif;
    --font-inter: 'Inter', -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-inter);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Stunning glowing background sphere */
.glow-bg {
    position: fixed;
    top: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, rgba(99, 102, 241, 0.04) 50%, transparent 100%);
    filter: blur(80px);
    z-index: -1;
    pointer-events: none;
}

/* App Container Layout */
.app-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 40px 24px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* Header Styling */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
}

.header-left .badge {
    display: inline-block;
    background: var(--primary-glow);
    color: hsl(217, 91%, 75%);
    font-family: var(--font-outfit);
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 6px 12px;
    border-radius: 99px;
    border: 1px solid hsla(217, 91%, 60%, 0.3);
    margin-bottom: 12px;
}

.header-left h1 {
    font-family: var(--font-outfit);
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 40%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 6px;
}

.header-left .subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    font-weight: 400;
}

/* Status Indicator */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 10px 18px;
    border-radius: 12px;
    font-family: var(--font-outfit);
    font-weight: 500;
    font-size: 0.95rem;
}

.status-indicator.safe {
    color: #34d399;
}

.status-indicator .pulse {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

/* KPI Dashboard Cards Grid */
.dashboard-kpis {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.kpi-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.6);
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--primary);
}

.kpi-card.warning::before { background-color: var(--warning); }
.kpi-card.success::before { background-color: var(--success); }
.kpi-card.limit::before { background-color: var(--accent); }

.kpi-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    background: var(--primary-glow);
    flex-shrink: 0;
}

.kpi-card.warning .kpi-icon { color: var(--warning); background: var(--warning-glow); }
.kpi-card.success .kpi-icon { color: var(--success); background: var(--success-glow); }
.kpi-card.limit .kpi-icon { color: var(--accent); background: var(--accent-glow); }

.kpi-icon svg {
    width: 26px;
    height: 26px;
}

.kpi-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.kpi-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi-value {
    font-family: var(--font-outfit);
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1;
}

.kpi-value .unit {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-muted);
}

.kpi-sub {
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* Premium Card Elements */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 28px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.card-header h2 {
    font-family: var(--font-outfit);
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.2px;
}

/* Main Layout Grid */
.app-main {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 28px;
    align-items: start;
}

/* Monatsübersicht Grid */
.calendar-legend {
    display: flex;
    gap: 16px;
}

.legend-item {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.color-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.color-dot.class { background-color: var(--primary); }
.color-dot.absent { background-color: var(--warning); }
.color-dot.holiday { background-color: var(--text-muted); opacity: 0.4; }

.calendar-grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* Monatskarten */
.month-card {
    background: rgba(30, 41, 59, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 16px;
    padding: 18px;
}

.month-name {
    font-family: var(--font-outfit);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 14px;
    text-align: center;
    color: #e2e8f0;
}

/* Kalenderwochenkopf */
.weekdays-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    margin-bottom: 8px;
    text-align: center;
}

.weekdays-header span {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Tage-Grid */
.days-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}

/* Einzelner Kalendertag */
.day-cell {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    background: transparent;
    border: 1px solid transparent;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.day-cell:hover {
    transform: scale(1.1);
    z-index: 10;
}

.day-cell.empty {
    cursor: default;
    opacity: 0.15;
}

.day-cell.empty:hover {
    transform: none;
}

.day-cell.class-day {
    background: var(--primary-glow);
    border-color: hsla(217, 91%, 60%, 0.25);
    color: hsl(217, 91%, 85%);
}

.day-cell.class-day:hover {
    border-color: var(--primary);
    box-shadow: 0 0 12px var(--primary-glow);
}

.day-cell.absent-day {
    background: var(--warning-glow);
    border-color: hsla(350, 89%, 60%, 0.35);
    color: hsl(350, 89%, 85%);
    font-weight: 700;
}

.day-cell.absent-day:hover {
    border-color: var(--warning);
    box-shadow: 0 0 12px var(--warning-glow);
}

.day-cell.holiday-day {
    opacity: 0.4;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-muted);
    font-weight: 400;
}

/* Modul-Kürzel auf dem Tag */
.day-cell .mod-badge {
    font-size: 0.55rem;
    font-weight: 600;
    opacity: 0.75;
    margin-top: 2px;
}

/* Sidebar Section */
.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

/* Modulanwesenheit Progress Bars */
.module-stats-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.module-stat-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.module-stat-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.module-stat-title {
    font-size: 0.9rem;
    font-weight: 600;
    max-width: 230px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.module-stat-pct {
    font-family: var(--font-outfit);
    font-size: 0.95rem;
    font-weight: 700;
}

.module-stat-pct.warning { color: var(--warning); }
.module-stat-pct.safe { color: var(--success); }

.progress-track {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 99px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 99px;
    background-color: var(--primary);
    transition: width 0.8s ease-out;
}

.progress-fill.warning { background-color: var(--warning); }
.progress-fill.safe { background-color: var(--success); }

.module-stat-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Absences List */
.absences-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 380px;
    overflow-y: auto;
    padding-right: 4px;
}

.absences-list::-webkit-scrollbar {
    width: 6px;
}
.absences-list::-webkit-scrollbar-track {
    background: transparent;
}
.absences-list::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 99px;
}

.absence-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s ease;
    cursor: pointer;
}

.absence-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.absence-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.absence-date {
    font-family: var(--font-outfit);
    font-weight: 700;
    font-size: 0.95rem;
}

.absence-module {
    font-size: 0.78rem;
    color: var(--text-muted);
    max-width: 220px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.absence-hours {
    background: var(--warning-glow);
    border: 1px solid hsla(350, 89%, 60%, 0.2);
    color: var(--warning);
    font-family: var(--font-outfit);
    font-weight: 700;
    font-size: 0.8rem;
    padding: 4px 10px;
    border-radius: 8px;
}

/* Slide-Over Side Panel */
.slide-over {
    position: fixed;
    top: 0;
    right: -400px;
    width: 380px;
    height: 100vh;
    background: rgba(15, 23, 42, 0.95);
    border-left: 1px solid var(--border-color);
    box-shadow: -20px 0 50px rgba(0, 0, 0, 0.7);
    z-index: 100;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(12px);
}

.slide-over.active {
    right: 0;
}

.slide-over-content {
    padding: 40px 28px;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 32px;
    position: relative;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-main);
}

.panel-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.panel-date {
    font-family: var(--font-outfit);
    font-size: 2rem;
    font-weight: 800;
    color: #ffffff;
}

.panel-header h3 {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
}

.panel-body {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.panel-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.panel-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.panel-status-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    width: fit-content;
}

.panel-status-badge.attended { background: var(--success-glow); color: var(--success); }
.panel-status-badge.absent { background: var(--warning-glow); color: var(--warning); }
.panel-status-badge.holiday { background: rgba(255, 255, 255, 0.05); color: var(--text-muted); }

.panel-value-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
}

.panel-value-sub {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.panel-value {
    font-size: 1rem;
    color: var(--text-main);
}

.panel-value.warning {
    color: var(--warning);
    font-weight: 600;
}

/* Responsive Styles */
@media (max-width: 1200px) {
    .app-main {
        grid-template-columns: 1fr;
    }
    
    .sidebar-section {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .sidebar-section {
        grid-template-columns: 1fr;
    }
    
    .header-left h1 {
        font-size: 2rem;
    }
}

/* --- Modal & Forms --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

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

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    width: 100%;
    max-width: 480px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--card-shadow);
}

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

.modal-header h3 {
    font-family: var(--font-outfit);
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: #fff;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-group input, .form-group select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px 16px;
    border-radius: 10px;
    color: #fff;
    font-family: var(--font-inter);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease;
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
}

.form-group select option {
    background: var(--bg-main);
    color: #fff;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 32px;
}

/* Buttons */
.btn-primary {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-outfit);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
    background: hsl(217, 91%, 65%);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-outfit);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}