/**
 * Mietverwaltung - Hauptstylesheet
 * Hausinvest GmbH - Wohnungsvermietung
 */

/* ============================================
   CSS-VARIABLEN
   ============================================ */
:root {
    --primary-color: #2c5282;
    --primary-dark: #1a365d;
    --primary-light: #4299e1;
    --secondary-color: #718096;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --danger-color: #f56565;
    --info-color: #4299e1;
    --light-color: #f7fafc;
    --dark-color: #1a202c;
    --gray-100: #f7fafc;
    --gray-200: #edf2f7;
    --gray-300: #e2e8f0;
    --gray-400: #cbd5e0;
    --gray-500: #a0aec0;
    --gray-600: #718096;
    --gray-700: #4a5568;
    --gray-800: #2d3748;
    --gray-900: #1a202c;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --border-radius-sm: 0.25rem;
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    --transition: all 0.2s ease-in-out;
}

/* ============================================
   BASIS-STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-100);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   TYPOGRAPHIE
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: 1rem;
}

.text-muted {
    color: var(--gray-500);
}

.text-small {
    font-size: var(--font-size-sm);
}

.text-large {
    font-size: var(--font-size-lg);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

.container-narrow {
    max-width: 768px;
}

.container-wide {
    max-width: 1440px;
}

main {
    flex: 1;
    padding: 2rem 0;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.navbar-brand:hover {
    color: var(--primary-dark);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--gray-700);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
}

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

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

.btn-secondary {
    color: var(--gray-700);
    background-color: var(--gray-200);
    border-color: var(--gray-200);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
    border-color: var(--gray-300);
}

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

.btn-success:hover {
    background-color: #38a169;
    border-color: #38a169;
}

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

.btn-danger:hover {
    background-color: #e53e3e;
    border-color: #e53e3e;
}

.btn-outline-primary {
    color: var(--primary-color);
    background-color: transparent;
    border-color: var(--primary-color);
}

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

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-lg);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    padding: 1.25rem;
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    margin-bottom: 1rem;
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-label.required::after {
    content: ' *';
    color: var(--danger-color);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--gray-800);
    background-color: white;
    background-clip: padding-box;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    color: var(--gray-800);
    background-color: white;
    border-color: var(--primary-light);
    outline: none;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-control:disabled {
    background-color: var(--gray-100);
    opacity: 1;
}

.form-control.is-invalid {
    border-color: var(--danger-color);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(245, 101, 101, 0.2);
}

.invalid-feedback {
    display: none;
    margin-top: 0.375rem;
    font-size: var(--font-size-sm);
    color: var(--danger-color);
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.form-text {
    margin-top: 0.375rem;
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

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

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check-input {
    width: 1.125rem;
    height: 1.125rem;
    cursor: pointer;
}

.form-check-label {
    cursor: pointer;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* ============================================
   ALERTS
   ============================================ */
.alert {
    position: relative;
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #22543d;
    background-color: #c6f6d5;
    border-color: #9ae6b4;
}

.alert-danger {
    color: #742a2a;
    background-color: #fed7d7;
    border-color: #fc8181;
}

.alert-warning {
    color: #744210;
    background-color: #fefcbf;
    border-color: #f6e05e;
}

.alert-info {
    color: #2a4365;
    background-color: #bee3f8;
    border-color: #90cdf4;
}

.alert-dismissible {
    padding-right: 3rem;
}

.alert-close {
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.5;
}

.alert-close:hover {
    opacity: 1;
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 9999px;
}

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

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

.badge-warning {
    color: #744210;
    background-color: #f6e05e;
}

.badge-info {
    color: white;
    background-color: var(--info-color);
}

.badge-secondary {
    color: var(--gray-700);
    background-color: var(--gray-300);
}

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

/* ============================================
   TABLES
   ============================================ */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    font-weight: 600;
    color: var(--gray-700);
    background-color: var(--gray-50);
    text-transform: uppercase;
    font-size: var(--font-size-xs);
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background-color: var(--gray-50);
}

.table-striped tbody tr:nth-child(odd) {
    background-color: var(--gray-50);
}

/* ============================================
   PAGINATION
   ============================================ */
.pagination {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0 0.75rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-700);
    background-color: white;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.page-link:hover {
    color: var(--primary-color);
    background-color: var(--gray-50);
    border-color: var(--gray-400);
}

.page-item.active .page-link {
    color: white;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* ============================================
   GRID
   ============================================ */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   APARTMENT CARDS
   ============================================ */
.apartment-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.apartment-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.apartment-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.apartment-card:hover .apartment-image img {
    transform: scale(1.05);
}

.apartment-status {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.apartment-info {
    flex: 1;
    padding: 1.5rem;
}

.apartment-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.apartment-address {
    color: var(--gray-500);
    font-size: var(--font-size-sm);
    margin-bottom: 1rem;
}

.apartment-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.apartment-feature {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.apartment-price {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin-top: auto;
}

.apartment-price-main {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.apartment-price-note {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--gray-800);
    color: var(--gray-300);
    padding: 3rem 0 1.5rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-title {
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--gray-400);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-700);
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }
.d-grid { display: grid !important; }

.flex-column { flex-direction: column !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }
.flex-wrap { flex-wrap: wrap !important; }
.gap-1 { gap: 0.25rem !important; }
.gap-2 { gap: 0.5rem !important; }
.gap-3 { gap: 1rem !important; }
.gap-4 { gap: 1.5rem !important; }

.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

.m-0 { margin: 0 !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.ml-auto { margin-left: auto !important; }
.mr-auto { margin-right: auto !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }

.p-0 { padding: 0 !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.p-4 { padding: 1.5rem !important; }

.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }
.text-uppercase { text-transform: uppercase !important; }
.font-weight-bold { font-weight: 700 !important; }
.font-weight-semibold { font-weight: 600 !important; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .navbar-container {
        flex-wrap: wrap;
        height: auto;
        padding: 0.75rem 0;
    }
    
    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
        margin-top: 0.75rem;
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

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

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

.stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
}

.stat-icon.primary {
    background-color: #ebf8ff;
    color: var(--primary-color);
}

.stat-icon.success {
    background-color: #f0fff4;
    color: var(--success-color);
}

.stat-icon.warning {
    background-color: #fffaf0;
    color: var(--warning-color);
}

.stat-icon.danger {
    background-color: #fff5f5;
    color: var(--danger-color);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* ============================================
   SIDEBAR (Admin)
   ============================================ */
.admin-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - 64px);
}

.sidebar {
    background-color: white;
    border-right: 1px solid var(--gray-200);
    padding: 1.5rem 0;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li {
    margin: 0.25rem 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--gray-600);
    font-weight: 500;
    transition: var(--transition);
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    color: var(--primary-color);
    background-color: var(--gray-50);
    border-right: 3px solid var(--primary-color);
}

.main-content {
    padding: 2rem;
    background-color: var(--gray-100);
}

@media (max-width: 1024px) {
    .admin-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: none;
    }
}

/* ============================================
   TABS
   ============================================ */
.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 1.5rem;
}

.tab {
    padding: 0.75rem 1.25rem;
    font-weight: 500;
    color: var(--gray-500);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: var(--transition);
}

.tab:hover {
    color: var(--primary-color);
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* ============================================
   MODAL
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    border-radius: var(--border-radius-lg);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-400);
}

.modal-close:hover {
    color: var(--gray-600);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}