/* =========================================
   GeoWelt - Deutsche Geographie Website
   Geographic/Natural Style Design
   ========================================= */

:root {
    --primary-blue: #1a5276;
    --secondary-blue: #2980b9;
    --accent-green: #27ae60;
    --earth-brown: #8b4513;
    --sand: #d4a574;
    --forest: #1e8449;
    --ocean: #2e86ab;
    --sky: #87ceeb;
    --light-bg: #f5f9f6;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --white: #ffffff;
    --shadow: rgba(0,0,0,0.1);
    --radius: 12px;
}

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

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

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

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--ocean) 100%);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px var(--shadow);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(26, 82, 118, 0.85), rgba(46, 134, 171, 0.85)),
                url('https://images.unsplash.com/photo-1469474968028-56623f02e42e?w=1920') center/cover;
    padding: 120px 0;
    text-align: center;
    color: var(--white);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 30px;
}

.btn {
    display: inline-block;
    padding: 15px 35px;
    background: var(--accent-green);
    color: var(--white);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(39, 174, 96, 0.4);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--white);
    margin-left: 15px;
}

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

/* Section Styles */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.tool-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: 0 5px 20px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    color: inherit;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.tool-card h3 {
    color: var(--primary-blue);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.tool-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Category Sections */
.category-section {
    background: var(--white);
}

.categories-nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-btn {
    padding: 12px 25px;
    background: var(--light-bg);
    border: 2px solid var(--secondary-blue);
    border-radius: 50px;
    color: var(--secondary-blue);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.category-btn:hover,
.category-btn.active {
    background: var(--secondary-blue);
    color: var(--white);
}

/* Articles */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.article-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 5px 20px var(--shadow);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-content {
    padding: 25px;
}

.article-meta {
    color: var(--accent-green);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.article-card h3 {
    color: var(--primary-blue);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.article-card p {
    color: var(--text-light);
}

.read-more {
    display: inline-block;
    margin-top: 15px;
    color: var(--accent-green);
    text-decoration: none;
    font-weight: 600;
}

/* Tool Page Styles */
.tool-page {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: 0 5px 30px var(--shadow);
}

.tool-page h1 {
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.tool-description {
    color: var(--text-light);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.tool-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-blue);
}

.result-box {
    background: linear-gradient(135deg, var(--primary-blue), var(--ocean));
    color: var(--white);
    padding: 25px;
    border-radius: 8px;
    margin-top: 20px;
}

.result-box h3 {
    margin-bottom: 15px;
}

/* Article Page */
.article-page {
    background: var(--white);
    padding: 60px;
    border-radius: var(--radius);
    max-width: 900px;
    margin: 0 auto;
}

.article-page img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 30px;
}

.article-page h1 {
    color: var(--primary-blue);
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.article-page .lead {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 30px;
    line-height: 1.8;
}

.article-page p {
    margin-bottom: 20px;
    line-height: 1.9;
}

/* Info Pages */
.info-page {
    background: var(--white);
    padding: 60px;
    border-radius: var(--radius);
    max-width: 800px;
    margin: 0 auto;
}

.info-page h1 {
    color: var(--primary-blue);
    margin-bottom: 30px;
}

.info-page h2 {
    color: var(--forest);
    margin: 30px 0 15px;
}

.info-page p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.info-page ul {
    margin: 15px 0 15px 30px;
}

.info-page li {
    margin-bottom: 10px;
}

/* Footer */
footer {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--ocean) 100%);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.2);
}

/* 404 Page */
.error-page {
    text-align: center;
    padding: 100px 20px;
}

.error-code {
    font-size: 8rem;
    color: var(--secondary-blue);
    font-weight: bold;
}

.error-page h1 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.error-page p {
    color: var(--text-light);
    margin-bottom: 30px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-blue);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    section {
        padding: 50px 0;
    }

    .tool-page,
    .article-page,
    .info-page {
        padding: 30px 20px;
    }

    .article-page img {
        height: 250px;
    }
}

/* Search Bar */
.search-box {
    max-width: 600px;
    margin: 0 auto 40px;
    display: flex;
    gap: 10px;
}

.search-box input {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 50px;
    font-size: 1rem;
}

.search-box button {
    padding: 15px 30px;
    background: var(--accent-green);
    border: none;
    border-radius: 50px;
    color: var(--white);
    font-weight: 600;
    cursor: pointer;
}

/* Breadcrumb */
.breadcrumb {
    padding: 20px 0;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--secondary-blue);
    text-decoration: none;
}

.breadcrumb span {
    margin: 0 10px;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 5px 20px var(--shadow);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--accent-green);
}

.stat-label {
    color: var(--text-light);
    margin-top: 10px;
}

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

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 40px 30px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 5px 20px var(--shadow);
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Table Styles */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.data-table th {
    background: var(--primary-blue);
    color: var(--white);
}

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

/* Tool Detail Specific */
.tool-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

@media (max-width: 768px) {
    .tool-detail-grid {
        grid-template-columns: 1fr;
    }
}

.converter-box,
.reference-box {
    background: var(--light-bg);
    padding: 25px;
    border-radius: var(--radius);
}

.converter-box h3,
.reference-box h3 {
    color: var(--primary-blue);
    margin-bottom: 20px;
}