/* ========================================
   Buchstaben Generator - Styles
   Mobile-first, performant, accessible
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-accent: #8b5cf6;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    --color-bg: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    
    --shadow-sm: 0 1px 2px 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);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    --transition: 0.2s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Dark Mode */
.dark {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--transition);
}

.skip-link:focus {
    top: 1rem;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    max-width: 260px;
    width: 100%;
    height: auto;
}

.logo:hover {
    opacity: 0.8;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: 0.5rem;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    transition: background var(--transition);
}

.dark-mode-toggle:hover {
    background: var(--color-border);
}

.icon-moon { display: none; }
.dark .icon-sun { display: none; }
.dark .icon-moon { display: inline; }

/* Main */
.main {
    flex: 1;
    padding: 2rem 0;
}

/* Hero */
.hero {
    text-align: center;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: clamp(1.75rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Generator Section */
.generator {
    text-align: center;
    margin-bottom: 3rem;
}

/* Letter Display */
.letter-display {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow-xl);
    display: inline-block;
    min-width: 200px;
}

.letter {
    font-size: clamp(5rem, 20vw, 10rem);
    font-weight: 700;
    color: white;
    display: block;
    line-height: 1;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.letter.animate {
    animation: bounceIn 0.5s ease-out;
}

@keyframes bounceIn {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.1); }
    70% { transform: scale(0.9); }
    100% { transform: scale(1); opacity: 1; }
}

/* Letter Colors by Category */
.letter-a-g { color: #10b981; } /* Grün */
.letter-h-n { color: #3b82f6; } /* Blau */
.letter-o-u { color: #f59e0b; } /* Orange */
.letter-v-z { color: #ef4444; } /* Rot */

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1.5rem;
}

.multi-generate {
    order: -1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.btn:focus-visible {
    outline: 3px solid var(--color-primary-light);
    outline-offset: 2px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

.btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
}

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

.generate-btn {
    min-width: 280px;
    padding: 1.25rem 2.5rem;
    font-size: 1.25rem;
}

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

/* Multi Generate */
.multi-generate {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.multi-generate label {
    font-size: 0.875rem;
    color: var(--color-text);
}

.select {
    padding: 0.5rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-secondary);
    color: var(--color-text);
    cursor: pointer;
    font-family: inherit;
}

.select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

/* Multi Letters Display */
.multi-letters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    min-height: 60px;
}

.multi-letter {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.75rem 1.25rem;
    font-size: 2rem;
    font-weight: 700;
    animation: bounceIn 0.3s ease-out;
}

/* History */
.history-section {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-top: 2rem;
}

.history-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.history {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
    min-height: 40px;
    justify-content: center;
}

.history-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.history-section .btn {
    margin: 0.25rem;
}

/* Info Sections */
.info-section {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}

.info-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

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

.info-section ul {
    list-style: none;
    padding: 0;
}

.info-section li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-secondary);
}

.info-section li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: bold;
}

/* Use Cases */
.use-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.use-case {
    text-align: center;
    padding: 1.5rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    transition: transform var(--transition);
}

.use-case:hover {
    transform: translateY(-4px);
}

.use-case-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.75rem;
}

.use-case h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.use-case p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* FAQ Section */
.faq-section h2 {
    margin-bottom: 1.5rem;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: 1.25rem 0;
}

.faq-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.faq-item:first-of-type {
    padding-top: 0;
}

.faq-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.faq-item p {
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.7;
}

/* SEO Content Section */
.seo-content h3 {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.seo-content h4 {
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.seo-content p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.seo-content ul {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.seo-content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* SEO Tables */
.seo-table-wrapper {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.seo-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.seo-table th,
.seo-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border: 1px solid var(--color-border);
}

.seo-table th {
    background: var(--color-bg);
    font-weight: 600;
    color: var(--color-text);
}

.seo-table td {
    color: var(--color-text-secondary);
}

.seo-table tbody tr:hover {
    background: var(--color-bg);
}

/* Legal Pages */
.legal-page {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.legal-page h1 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--color-text);
}

.legal-page h2 {
    font-size: 1.4rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.legal-page h3 {
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.legal-page p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.legal-page ul {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.legal-page li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.legal-page a {
    color: var(--color-primary);
    text-decoration: none;
}

.legal-page a:hover {
    text-decoration: underline;
}

.legal-page section {
    margin-bottom: 1.5rem;
}

.legal-date {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Ad Placeholder */
.ad-placeholder {
    background: var(--color-bg-secondary);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    color: var(--color-text-secondary);
    margin: 2rem 0;
}

/* Footer */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    margin-top: auto;
}

.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.footer p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-nav {
    display: flex;
    gap: 1.5rem;
}

.footer-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition);
}

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

/* Responsive */
@media (min-width: 640px) {
    .container {
        padding: 0 2rem;
    }
    
    .footer .container {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 768px) {
    .main {
        padding: 3rem 0;
    }
    
    .letter-display {
        padding: 3rem 4rem;
        min-width: 300px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header, .footer, .controls, .history-section {
        display: none;
    }
    
    .letter-display {
        box-shadow: none;
        border: 2px solid #000;
    }
}