:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --secondary: #10b981;
    --accent: #1e3a8a;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);

    /* Notenfarben */
    --grade-1: #10b981;
    --grade-2: #84cc16;
    --grade-3: #eab308;
    --grade-4: #f97316;
    --grade-5: #ef4444;
    --grade-6: #991b1b;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.2rem;
}

.brand-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-item {
    text-decoration: none;
    padding: 0.5rem 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary);
    background: var(--primary-light);
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    background: var(--border-light);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text);
}

/* Control Bar (Child & Year Switcher) */
.control-bar {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1rem;
}

.control-bar-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.child-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.child-pill {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.9rem;
    background: var(--border-light);
    border: 1.5px solid transparent;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    transition: all 0.2s;
}

.child-pill:hover {
    border-color: var(--primary);
    background: #ffffff;
}

.child-pill.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(74, 111, 165, 0.3);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.select-styled {
    padding: 0.45rem 1.8rem 0.45rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #ffffff url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e") no-repeat right 0.6rem center/14px;
    appearance: none;
    font-size: 0.9rem;
    color: var(--text);
    font-weight: 500;
    cursor: pointer;
}

.select-styled:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.15);
}

/* Halbjahr Tabs */
.half-year-tabs {
    display: flex;
    background: var(--border-light);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.tab-btn {
    border: none;
    background: transparent;
    padding: 0.4rem 0.85rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn.active {
    background: #ffffff;
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Page Layout */
.page-container {
    max-width: 1280px;
    margin: 1.5rem auto;
    padding: 0 1rem;
    width: 100%;
    flex: 1;
}

/* KPI Banner */
.kpi-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

@media (min-width: 640px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .kpi-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.kpi-card {
    background: #ffffff;
    border-radius: var(--radius);
    padding: 1.25rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.kpi-main {
    background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
    border-left: 5px solid var(--primary);
}

.kpi-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.kpi-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 700;
}

.kpi-value-row {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
}

.kpi-value {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.1;
}

.kpi-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

/* Grade badges */
.grade-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    border-radius: 8px;
    padding: 0.2rem 0.6rem;
    font-size: 1rem;
    min-width: 44px;
    color: #ffffff;
}

.grade-1 { background-color: var(--grade-1); }
.grade-2 { background-color: var(--grade-2); }
.grade-3 { background-color: var(--grade-3); color: #1e293b; }
.grade-4 { background-color: var(--grade-4); }
.grade-5 { background-color: var(--grade-5); }
.grade-6 { background-color: var(--grade-6); }
.grade-empty { background-color: #94a3b8; }

/* Sections & Action Bar */
.section-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 2px 6px rgba(74, 111, 165, 0.25);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: #ffffff;
    border-color: var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    background-color: var(--border-light);
    border-color: #cbd5e1;
}

.btn-sm {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
}

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid transparent;
    cursor: pointer;
    color: var(--text-muted);
}

.btn-icon:hover {
    background: var(--border-light);
    color: var(--text);
}

.btn-danger-icon:hover {
    background: #fee2e2;
    color: #dc2626;
}

/* Subject Grid */
.subjects-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 768px) {
    .subjects-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1200px) {
    .subjects-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

.subject-card {
    background: #ffffff;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, border-color 0.2s;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.subject-card:hover {
    box-shadow: var(--shadow-md);
}

.subject-card.is-major {
    border-top: 4px solid var(--primary);
}

.subject-header {
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-light);
    background: #ffffff;
}

.subject-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.subject-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
}

.subject-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.subject-meta {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
}

.badge-major {
    background: #e0e7ff;
    color: #4338ca;
    font-weight: 700;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
}

.badge-minor {
    background: #f1f5f9;
    color: #64748b;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
}

.subject-average-box {
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.subject-grades-list {
    padding: 0.75rem 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 280px;
    overflow-y: auto;
}

.grade-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.65rem;
    background: var(--border-light);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: background 0.15s;
}

.grade-item:hover {
    background: #e2e8f0;
}

.grade-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    overflow: hidden;
}

.type-pill {
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
}

.type-arbeit { background: #dbeafe; color: #1d4ed8; }
.type-hue { background: #ccfbf1; color: #0f766e; }
.type-test { background: #fef3c7; color: #b45309; }
.type-muendlich { background: #dcfce7; color: #15803d; }
.type-epochal { background: #f3e8ff; color: #7e22ce; }
.type-projekt { background: #fce7f3; color: #be185d; }

.grade-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px;
}

.grade-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.grade-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.subject-footer {
    padding: 0.75rem 1.25rem;
    background: #fafafa;
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Modals */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease-in-out;
}

.modal-backdrop.show {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: #ffffff;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 520px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    overflow: hidden;
    transform: translateY(20px);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.show .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.2rem;
    font-weight: 700;
}

.modal-body {
    padding: 1.5rem;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 1rem 1.5rem;
    background: #f8fafc;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Form controls */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text);
    background: #ffffff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.15);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Quick Grade Selection Pills */
.grade-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.4rem;
}

.preset-btn {
    padding: 0.35rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #ffffff;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
}

.preset-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary-dark);
}

/* Toast notifications */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: #1e293b;
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.toast-success { background: #065f46; }
.toast.toast-error { background: #991b1b; }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Analytics Specific Styles */
.analytics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (min-width: 900px) {
    .analytics-grid-2 {
        grid-template-columns: 2fr 1fr;
    }
    .analytics-grid-equal {
        grid-template-columns: 1fr 1fr;
    }
}

.chart-card {
    background: #ffffff;
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.chart-title {
    font-size: 1.15rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-container {
    position: relative;
    height: 280px;
    width: 100%;
}

/* Alerts and Indicators */
.alert-box {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.alert-warning {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
}

.alert-success {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.alert-info {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1e40af;
}

.trend-arrow {
    font-weight: 800;
    font-size: 1.1rem;
    display: inline-block;
}

.trend-up { color: #16a34a; }
.trend-down { color: #dc2626; }
.trend-neutral { color: #eab308; }