/* ==========================================
   INTERNETGEMEIN.DE - Online-Taschenrechner
   Professional German Calculator Website
   ========================================== */

:root {
    --primary-color: #DD0000;
    --primary-dark: #FFCC00;
    --primary-light: #dd6b00;
    --secondary-color: #eed704;
    --accent-color: #FFCC00;
    --hover-color: #2980b9;
    --success-color: #27ae60;
    --text-dark: #000000;
    --text-light: #000000;
    --bg-light: #ecf0f1;
    --bg-white: #ffffff;
    --border-color: #f7c10f;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 20px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

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

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

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow);
    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-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
    color: white;
}

.logo-icon {
    font-size: 2rem;
    animation: rotate 3s linear infinite;
}

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

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link:hover {
    color: var(--accent-color);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--hover-color) 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    animation: fadeIn 1s ease-out;
}

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

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.95;
}

/* ==========================================
   MAIN CONTENT
   ========================================== */

main {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 2rem;
}

.content-section {
    background: var(--bg-white);
    border-radius: 10px;
    padding: 3rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.6s ease-out;
}

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

.content-section:hover {
    box-shadow: var(--shadow-hover);
    transition: var(--transition);
}

.section-title {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* ==========================================
   CALCULATOR GRID
   ========================================== */

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.calculator-card {
    background: var(--bg-white);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent-color);
}

.calculator-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    display: block;
}

.calculator-card h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.calculator-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ==========================================
   CALCULATOR FORM STYLES
   ========================================== */

.calculator-container {
    background: var(--bg-white);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 600;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--bg-white);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.input-hint {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 0.25rem;
    display: block;
}

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

.btn {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--hover-color) 100%);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.4);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--hover-color) 100%);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
}

/* ==========================================
   RESULTS
   ========================================== */

.result-box {
    background: linear-gradient(135deg, var(--success-color) 0%, #229954 100%);
    color: white;
    padding: 2rem;
    border-radius: 10px;
    margin-top: 2rem;
    box-shadow: var(--shadow);
    animation: slideIn 0.5s ease-out;
}

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

.result-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.result-item {
    background: rgba(255,255,255,0.2);
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 0.5rem;
    backdrop-filter: blur(10px);
}

.result-item strong {
    font-size: 1.2rem;
}

/* ==========================================
   INFORMATION SECTION
   ========================================== */

.info-section {
    background: var(--bg-light);
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    border-radius: 5px;
    margin-top: 2rem;
}

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

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

.info-section li {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

/* ==========================================
   FOOTER
   ========================================== */

footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

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

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

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

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

.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: var(--transition);
}

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

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

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    nav {
        width: 100%;
    }

    nav ul {
        flex-direction: column;
        gap: 1rem;
        display: none;
    }

    nav ul.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

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

    .content-section {
        padding: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

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

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

.hidden {
    display: none;
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* ==========================================
   SCROLL ANIMATIONS
   ========================================== */

.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   LOADING SPINNER
   ========================================== */

.spinner {
    border: 3px solid rgba(52, 152, 219, 0.3);
    border-top: 3px 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); }
}