/* ================================================
   InternetGemein.de - Online-Taschenrechner
   Professional Calculator Directory Styles
   ================================================ */

/* ==================== CSS Variables ==================== */
:root {
    /* Color Palette - Professional Blues & Grays */
    --primary-color: #DD0000;
    --primary-dark: #FFCC00;
    --primary-light: #dd6b00;
    --secondary-color: #1f2022;
    --accent-color: #FFCC00;
    
    /* Neutral Colors */
    --text-primary: #000000;
    --text-secondary: #000000;
    --text-light: #101011;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    
    /* Border & Shadow */
    --border-color: #FFCC00;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Container Width */
    --container-max-width: 1280px;
}

/* ==================== Reset & Base Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

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

/* ==================== Container ==================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==================== Cookie Consent Banner (GDPR) ==================== */
.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-xl);
    z-index: 10000;
    transform: translateY(100%);
    transition: transform var(--transition-slow);
}

.cookie-consent.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.cookie-content i {
    font-size: 2rem;
    color: var(--accent-color);
}

.cookie-content p {
    flex: 1;
    margin: 0;
    color: #e2e8f0;
    min-width: 250px;
}

.cookie-content a {
    color: var(--accent-color);
    text-decoration: underline;
}

.cookie-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-accept, .btn-decline {
    padding: 0.625rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-primary);
    font-size: 0.875rem;
}

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

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

.btn-decline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-decline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

/* ==================== Header & Navigation ==================== */
.header {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    color: var(--primary-color);
    font-size: 1.75rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

/* ==================== Hero Section ==================== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.search-box i {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.search-box input {
    width: 100%;
    padding: 1rem 1rem 1rem 3.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-primary);
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-base);
}

.search-box input:focus {
    outline: none;
    box-shadow: 0 20px 30px -5px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

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

/* ==================== Main Content ==================== */
.main-content {
    padding: var(--spacing-2xl) 0;
}

/* ==================== Filter Categories ==================== */
.filter-categories {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
    scrollbar-width: thin;
}

.filter-categories::-webkit-scrollbar {
    height: 6px;
}

.filter-categories::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.filter-categories::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 3px;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    font-family: var(--font-primary);
    font-size: 0.9375rem;
}

.filter-btn i {
    font-size: 1.125rem;
}

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

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

/* ==================== Calculator Cards Grid ==================== */
.calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeIn 0.6s ease;
}

.calculator-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.calculator-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.calculator-card:hover::before {
    transform: scaleX(1);
}

.calculator-card.hidden {
    display: none;
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

.calculator-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
}

.card-icon i {
    font-size: 1.75rem;
    color: white;
}

.card-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
}

.card-link i {
    transition: transform var(--transition-base);
}

.card-link:hover {
    gap: 0.75rem;
}

.card-link:hover i {
    transform: translateX(4px);
}

/* ==================== No Results ==================== */
.no-results {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    animation: fadeIn 0.5s ease;
}

.no-results i {
    font-size: 4rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.no-results h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.no-results p {
    color: var(--text-secondary);
}

/* ==================== Footer ==================== */
.footer {
    background: var(--bg-dark);
    color: #e2e8f0;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

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

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

.footer-section p {
    color: #cbd5e1;
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: #cbd5e1;
    transition: color var(--transition-fast);
    display: inline-block;
}

.footer-section a:hover {
    color: var(--accent-color);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.footer-links a {
    color: #cbd5e1;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-color);
}

.copyright {
    color: #94a3b8;
    font-size: 0.875rem;
    text-align: center;
}

/* ==================== Back to Top Button ==================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ==================== Responsive Design ==================== */

/* Tablet (768px and below) */
@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .calculators-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .filter-categories {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
    }
    
    .footer-links {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .cookie-content {
        flex-direction: column;
        text-align: center;
    }
    
    .cookie-buttons {
        width: 100%;
        justify-content: center;
    }
}

/* Mobile (576px and below) */
@media (max-width: 576px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 0.9375rem;
    }
    
    .calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
        font-size: 1rem;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

/* Large Desktop (1400px and above) */
@media (min-width: 1400px) {
    .calculators-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

/* ==================== Print Styles ==================== */
@media print {
    .header,
    .hero,
    .filter-categories,
    .footer,
    .back-to-top,
    .cookie-consent {
        display: none;
    }
    
    .calculator-card {
        break-inside: avoid;
    }
}

/* ==================== Accessibility ==================== */
/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0047ab;
        --text-primary: #000000;
        --border-color: #000000;
    }
    
    .calculator-card {
        border-width: 2px;
    }
}