/* ============================================
   Online-Taschenrechner - Professional Styles
   https://internetgemein.de/
   ============================================ */

:root {
    /* Color Palette - Professional & Formal */
 /* 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);
 --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--light-bg);
    overflow-x: hidden;
}

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

a:hover {
    color: var(--secondary-color);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-fluid {
    width: 100%;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
    color: var(--white);
}

.logo-icon {
    width: 40px;
    height: 40px;
    fill: var(--white);
}

/* Navigation */
nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--white);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.nav-link:hover::after {
    width: 80%;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    transition: var(--transition);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--white);
    border-radius: 3px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path d="M0,60 Q300,0 600,60 T1200,60 L1200,0 L0,0 Z" fill="rgba(255,255,255,0.05)"/></svg>');
    background-size: cover;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

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

.hero h1 {
    color: var(--white);
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 2rem;
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: 3rem 0;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.calculator-card {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.calculator-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

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

.calculator-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 1.5rem;
    fill: var(--accent-color);
    transition: var(--transition);
}

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

.calculator-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.35rem;
}

.calculator-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    color: var(--white);
}

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

.btn-secondary {
    background: var(--light-bg);
    color: var(--primary-color);
    border: 2px solid var(--border-color);
}

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

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: var(--transition);
    background: var(--white);
    color: var(--text-primary);
    font-family: inherit;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

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

/* Calculator Page Specific */
.calculator-container {
    max-width: 900px;
    margin: 2rem auto;
    background: var(--white);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.6s ease-out;
}

.calculator-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.calculator-form {
    margin-bottom: 2rem;
}

.result-box {
    background: linear-gradient(135deg, var(--light-bg) 0%, var(--white) 100%);
    border: 2px solid var(--accent-color);
    border-radius: 12px;
    padding: 2rem;
    margin-top: 2rem;
    animation: slideUp 0.4s ease-out;
}

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

.result-box h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent-color);
}

.result-label {
    color: var(--text-secondary);
}

.result-value {
    color: var(--primary-color);
    font-weight: 600;
}

/* Info Section */
.info-section {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: 12px;
    border-left: 4px solid var(--accent-color);
}

.info-section h2,
.info-section h3 {
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.info-section p,
.info-section ul {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.info-section ul {
    padding-left: 1.5rem;
}

.info-section li {
    margin-bottom: 0.5rem;
}

/* Table Styles */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table thead {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
}

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

.data-table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.data-table tr:hover {
    background: var(--light-bg);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

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

.footer-section h4 {
    color: var(--white);
    margin-bottom: 1rem;
}

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

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

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

.footer-section a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* Alerts & Messages */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.alert-success {
    background: rgba(40, 167, 69, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    border-color: var(--warning-color);
    color: #856404;
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

/* Loading Spinner */
.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-color);
        flex-direction: column;
        gap: 0;
        padding: 1rem;
        box-shadow: var(--shadow-lg);
    }
    
    nav ul.active {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .calculator-container {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .calculator-card {
        padding: 1.5rem;
    }
    
    .btn {
        width: 100%;
    }
}

/* Print Styles */
@media print {
    header, footer, .btn, nav {
        display: none;
    }
    
    .calculator-container {
        box-shadow: none;
        padding: 0;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }