/* ============================================
   Notentabelle - Digitale Notenverwaltung
   Modernes, responsives Design
   ============================================ */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;

    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-sidebar: #1e293b;
    --bg-sidebar-hover: #334155;

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;

    --border: #e2e8f0;
    --border-light: #f1f5f9;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'SF Mono', Monaco, monospace;

    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============================================
   LAYOUT
   ============================================ */

.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: var(--transition);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-header .version {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 0.25rem;
    display: block;
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
    flex: 1;
    overflow-y: auto;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-item a:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-white);
}

.nav-item.active a {
    background: var(--bg-sidebar-hover);
    color: var(--text-white);
    border-left-color: var(--primary);
}

.nav-item .icon {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.nav-item .label {
    font-size: 0.9375rem;
    font-weight: 500;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.75rem;
    opacity: 0.6;
}

.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
}

.top-bar {
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}

.top-bar h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
}

.user-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.user-role {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.content-wrapper {
    padding: 2rem;
    flex: 1;
}

/* ============================================
   KARTEN / CARDS
   ============================================ */

.card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

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

.card-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background: var(--border-light);
    border-top: 1px solid var(--border);
}

/* ============================================
   STATISTIK-KARTEN
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.stat-icon.blue { background: var(--primary-light); }
.stat-icon.green { background: #d1fae5; }
.stat-icon.yellow { background: #fef3c7; }
.stat-icon.red { background: #fee2e2; }

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* ============================================
   TABELLEN
   ============================================ */

.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-secondary);
    font-size: 0.9375rem;
}

thead {
    background: var(--bg-primary);
}

th {
    padding: 0.875rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

tbody tr:hover {
    background: var(--bg-primary);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* Noten-Farbkodierung */
.note-1 { color: #059669; font-weight: 600; }
.note-2 { color: #10b981; font-weight: 600; }
.note-3 { color: #3b82f6; font-weight: 600; }
.note-4 { color: #f59e0b; font-weight: 600; }
.note-5 { color: #f97316; font-weight: 600; }
.note-6 { color: #dc2626; font-weight: 600; }

/* ============================================
   FORMULARE
   ============================================ */

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

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

.form-input::placeholder {
    color: var(--text-light);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

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

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #059669;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

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

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

/* ============================================
   NOTENEINGABE (SPEZIELL)
   ============================================ */

.noten-grid {
    display: grid;
    gap: 2rem;
}

.klausur-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

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

.klausur-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.klausur-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.punkte-tabelle {
    width: 100%;
    border-collapse: collapse;
}

.punkte-tabelle th {
    background: var(--bg-primary);
    padding: 0.75rem;
    font-size: 0.8125rem;
    text-align: center;
}

.punkte-tabelle td {
    padding: 0.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
}

.punkte-tabelle td:first-child {
    text-align: left;
    font-weight: 500;
    padding-left: 1rem;
}

.punkte-input {
    width: 60px;
    padding: 0.375rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.punkte-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
    outline: none;
}

.punkte-input.error {
    border-color: var(--danger);
    background: #fef2f2;
}

.summe-zelle {
    font-weight: 600;
    background: var(--bg-primary);
}

.note-zelle {
    font-weight: 700;
    font-size: 1rem;
}

/* ============================================
   ALERTS / MESSAGES
   ============================================ */

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-info {
    background: var(--primary-light);
    color: var(--primary-dark);
    border: 1px solid #bfdbfe;
}

/* ============================================
   BADGES
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-blue { background: var(--primary-light); color: var(--primary-dark); }
.badge-green { background: #d1fae5; color: #065f46; }
.badge-yellow { background: #fef3c7; color: #92400e; }
.badge-red { background: #fee2e2; color: #991b1b; }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
    .sidebar {
        width: 64px;
    }

    .sidebar-header h1,
    .nav-item .label,
    .sidebar-footer {
        display: none;
    }

    .nav-item a {
        justify-content: center;
        padding: 1rem;
    }

    .main-content {
        margin-left: 64px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 260px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .content-wrapper {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

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

/* ============================================
   UTILITIES
   ============================================ */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }

.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

.hidden { display: none; }