/**
 * HEIZSPAREXPERTEN.DE - MAIN STYLESHEET
 * 
 * Design: Professional, Clean, Trustworthy
 * Farben: Grün (#1f7a4f) + Blau (#0d3c55)
 * Mobile-First, Cross-Browser-kompatibel
 */

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Farben */
    --color-primary: #1f7a4f;
    --color-primary-dark: #165a3a;
    --color-primary-light: #2a9d66;
    --color-secondary: #0d3c55;
    --color-secondary-dark: #082938;
    --color-secondary-light: #134f71;
    
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-border: #dddddd;
    --color-bg: #ffffff;
    --color-bg-light: #f9f9f9;
    --color-bg-dark: #f4f4f4;
    
    --color-success: #28a745;
    --color-error: #dc3545;
    --color-warning: #ffc107;
    --color-info: #17a2b8;
    
    /* Typografie */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Header Height */
    --header-height: 70px;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.site-content {
    min-height: calc(100vh - var(--header-height) - 200px);
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* Logo */
.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-secondary);
    transition: color var(--transition-fast);
}

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

.logo-icon {
    font-size: 1.5rem;
}

/* Desktop Navigation */
.desktop-nav {
    display: none;
}

.desktop-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.desktop-nav a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text);
    font-weight: 500;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

.desktop-nav a:hover {
    background-color: var(--color-bg-dark);
    color: var(--color-primary);
}

.desktop-nav li.active a {
    background-color: var(--color-primary);
    color: white;
}

/* Hamburger Menu */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-secondary);
    transition: all var(--transition-base);
}

.hamburger:hover span {
    background-color: var(--color-primary);
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.mobile-nav-content {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 80%;
    max-width: 300px;
    background-color: white;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.mobile-nav-overlay.active .mobile-nav-content {
    transform: translateX(0);
}

.mobile-nav-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-text);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav ul {
    list-style: none;
    margin-top: var(--spacing-xl);
}

.mobile-nav li {
    margin-bottom: var(--spacing-sm);
}

.mobile-nav a {
    display: block;
    padding: var(--spacing-sm);
    color: var(--color-text);
    font-size: 1.125rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-nav a:hover {
    background-color: var(--color-bg-dark);
    color: var(--color-primary);
}

.mobile-nav li.active a {
    background-color: var(--color-primary);
    color: white;
}

/* Desktop Navigation (ab 768px) */
@media (min-width: 768px) {
    .desktop-nav {
        display: block;
    }
    
    .hamburger {
        display: none;
    }
    
    body {
        padding-top: var(--header-height);
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-text {
    background-color: transparent;
    color: var(--color-primary);
    padding: 8px 16px;
}

.btn-text:hover {
    background-color: var(--color-bg-dark);
}

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

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-secondary);
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    font-family: inherit;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Honeypot (muss unsichtbar sein!) */
.honeypot {
    position: absolute !important;
    left: -9999px !important;
    width: 1px !important;
    height: 1px !important;
    opacity: 0 !important;
    pointer-events: none !important;
}

/* ============================================
   COOKIE-BANNER
   ============================================ */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: white;
    border-top: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md);
    z-index: 9999;
}

.cookie-banner-content {
    max-width: 1200px;
    margin: 0 auto;
}

.cookie-banner-text h3 {
    margin-bottom: var(--spacing-xs);
}

.cookie-banner-text p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.cookie-banner-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.cookie-settings {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.cookie-category {
    margin-bottom: var(--spacing-md);
}

.cookie-category label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.cookie-category input[type="checkbox"] {
    margin-top: 3px;
    width: 18px;
    height: 18px;
}

.cookie-description {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: 4px;
}

.cookie-settings-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background-color: var(--color-secondary);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-column h3 {
    color: white;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

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

.footer-links li,
.footer-contact li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a,
.footer-contact a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

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

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

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

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

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    margin-bottom: 0;
}

.card-body {
    margin-bottom: var(--spacing-md);
}

.card-footer {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* ============================================
   GRID
   ============================================ */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: 1fr;
}

.grid-3 {
    grid-template-columns: 1fr;
}

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

/* ============================================
   UTILITIES
   ============================================ */
.text-center {
    text-align: center;
}

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

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

.text-primary {
    color: var(--color-primary);
}

.text-success {
    color: var(--color-success);
}

.text-error {
    color: var(--color-error);
}

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none !important;
}

/* ============================================
   ALERTS / MESSAGES
   ============================================ */
.alert {
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.alert-success {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-error {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-info {
    background-color: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

.alert-warning {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
}

/* ============================================
   LOADING SPINNER
   ============================================ */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */
@media (max-width: 767px) {
    body {
        padding-top: var(--header-height);
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .cookie-banner-actions {
        flex-direction: column;
    }
    
    .cookie-banner-actions .btn {
        width: 100%;
    }
}