/* ============================================
   TalNerds Design System
   Digitale Souveränität - Vertrauenswürdig & Unabhängig
   ============================================ */

:root {
    /* Color Palette - Inspired by independence and trust */
    --color-primary: #2c5f2d;        /* Forest Green - Growth & Nature */
    --color-primary-light: #4a8f4d;
    --color-primary-dark: #1a3a1b;
    
    --color-secondary: #d97706;      /* Amber - Energy & Authenticity */
    --color-secondary-light: #f59e0b;
    --color-secondary-dark: #b45309;
    
    --color-neutral-50: #fafafa;
    --color-neutral-100: #f5f5f5;
    --color-neutral-200: #e5e5e5;
    --color-neutral-300: #d4d4d4;
    --color-neutral-400: #a3a3a3;
    --color-neutral-500: #737373;
    --color-neutral-600: #525252;
    --color-neutral-700: #404040;
    --color-neutral-800: #262626;
    --color-neutral-900: #171717;
    
    --color-success: #16a34a;
    --color-warning: #f59e0b;
    --color-error: #dc2626;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
    --font-mono: "SFMono-Regular", "Consolas", "Liberation Mono", "Courier New", monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --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);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ============================================
   Global Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-neutral-900);
    background-color: var(--color-neutral-50);
    overflow-x: hidden;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-neutral-900);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-dark);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    margin-bottom: var(--spacing-md);
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.1rem;
}

h6 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-neutral-700);
}

p {
    margin-bottom: var(--spacing-md);
    max-width: 65ch;
}

p:last-child {
    margin-bottom: 0;
}

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

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

a:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

strong {
    font-weight: 700;
    color: var(--color-primary-dark);
}

em {
    font-style: italic;
    color: var(--color-neutral-700);
}

/* ============================================
   Lists
   ============================================ */

ul, ol {
    margin-bottom: var(--spacing-lg);
    margin-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Code
   ============================================ */

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--color-neutral-200);
    color: var(--color-neutral-900);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

pre {
    background-color: var(--color-neutral-900);
    color: #e0e0e0;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
}

pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
}

/* ============================================
   Header & Navigation
   ============================================ */

header {
    background-color: white;
    border-bottom: 2px solid var(--color-primary-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

nav {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
}

nav .nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    width: 100%;
    justify-content: flex-end;
}

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

nav .nav-nerds p {
    margin: 0 0 var(--spacing-sm);
    font-size: 0.95rem;
    font-weight: 600;
}

nav a {
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

nav a:hover,
nav a:active {
    background-color: var(--color-primary-light);
    color: white;
}

.nav-toggle-checkbox {
    display: none;
}

.nav-toggle {
    display: none;
    background-color: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-primary-dark);
    width: 44px;
    height: 44px;
    position: relative;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: currentColor;
    border-radius: var(--radius-full);
    margin: 5px auto;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle-checkbox:checked + .nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle-checkbox:checked + .nav-toggle span:nth-child(2) {
    opacity: 0;
}

.nav-toggle-checkbox:checked + .nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mode Selector */
.mode-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.mode-toggle {
    background-color: var(--color-neutral-100);
    border: 2px solid var(--color-neutral-300);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.25rem;
    cursor: pointer;
    transition: 
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        transform var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
}

.mode-toggle:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    color: white;
}

.mode-toggle:active {
    transform: scale(0.95);
}

.mode-toggle:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

.mode-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    font-size: 1.25rem;
}

/* ============================================
   Main Content
   ============================================ */

main {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    height: 400px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    transform: translate(100px, -100px);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: -50px;
    width: 200px;
    height: 200px;
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.95);
}

.notfall {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    font-family: inherit;
    font-size: 1rem;
    text-align: center;
}

.btn:focus {
    outline-offset: 2px;
}

/* Primary Button */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
    color: white;
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
    box-shadow: var(--shadow-md);
}

/* Error Button */
.btn-error {
    background-color: var(--color-error);
    color: white;
}

.btn-error:hover {
    background-color: var(--color-error);
    box-shadow: var(--shadow-md);
}

/* Outline Button */
.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

/* ============================================
   Cards
   ============================================ */

.card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-dark);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

/* ============================================
   Sections
   ============================================ */

section {
    margin-bottom: var(--spacing-3xl);
}

section h2 {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 3px solid var(--color-secondary);
}

/* ============================================
   Forms
   ============================================ */

form {
    max-width: 600px;
    margin: var(--spacing-2xl) 0;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-neutral-700);
}


input[type="checkbox"] {
    width: auto;
    margin-right: var(--spacing-sm);
}

input,
textarea,
select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 95, 45, 0.1);
}

textarea {
    resize: vertical;
    min-height: 150px;
}

/* ============================================
   Footer
   ============================================ */

footer {
    background-color: var(--color-neutral-900);
    color: var(--color-neutral-200);
    padding: var(--spacing-3xl) var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

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

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

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
}

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

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

.footer-section ul {
    list-style: none;
    margin-left: 0;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-neutral-700);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--color-neutral-400);
    font-size: 0.9rem;
}

/* ============================================
   Utilities
   ============================================ */

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

.text-muted {
    color: var(--color-neutral-500);
}

.text-primary {
    color: var(--color-primary);
}

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

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    padding: 0;
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.flex {
    display: flex;
    gap: var(--spacing-md);
}

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

@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    nav {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: var(--spacing-md);
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        display: flex;
        flex-direction: column;
        width: 100%;
        overflow: hidden;
        max-height: 0;
        transition: max-height var(--transition-fast);
    }

    .nav-toggle-checkbox:checked ~ .nav-menu {
        max-height: 1000px;
    }
    
    nav ul {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    nav a {
        display: block;
        width: 100%;
    }
    
    .nav-nerds {
        text-align: left;
        width: 100%;
    }
    
    .nav-nerds ul {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .hero {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    form {
        margin: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    main {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.25rem;
    }
    
    section {
        margin-bottom: var(--spacing-2xl);
    }
    
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .hero p {
        font-size: 1rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    header,
    footer {
        display: none;
    }
    
    body {
        background-color: white;
    }
    
    a {
        text-decoration: underline;
    }
}