/* ============================================
   Modern Apple-inspired Design System
   ============================================ */

/* CSS Variables für konsistente Farben und Spacing */
:root {
    /* Farben - Apple-inspiriert */
    --color-primary: #1d1d1f;
    --color-secondary: #86868b;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-background: #ffffff;
    --color-background-alt: #f5f5f7;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-border: #d2d2d7;
    
    /* Spacing System */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-xxl: 8rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--color-text);
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
}

h2 {
    font-size: var(--font-size-4xl);
    font-weight: 600;
}

h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
}

p {
    margin-bottom: 1rem;
    line-height: 1.47059;
}

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

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

/* ============================================
   Container & Layout
   ============================================ */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-4xl);
    font-weight: 600;
    letter-spacing: -0.03em;
}

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

header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    transition: background-color var(--transition-base);
}

@media screen and (max-width: 768px) {
    header {
        padding: 0.75rem 0;
    }
}

header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.logo {
    height: 44px;
    width: auto;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

nav a {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 400;
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition-fast);
}

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

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

nav a:hover::after {
    width: 100%;
}

.contact-button {
    background-color: var(--color-accent);
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 400;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.contact-button:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.menu-toggle:hover {
    background-color: var(--color-background-alt);
}

.menu-toggle span {
    width: 24px;
    height: 2.5px;
    background-color: var(--color-text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
    display: block;
}

.menu-toggle.active {
    background-color: var(--color-background-alt);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
    background-color: var(--color-accent);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
    background-color: var(--color-accent);
}

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

.hero {
    padding: var(--spacing-xxl) 0;
    text-align: center;
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-background-alt) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-5xl);
    font-weight: 700;
    letter-spacing: -0.04em;
}

.hero p {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.hero-image {
    width: 100%;
    max-width: 900px;
    height: auto;
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

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

.content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    border-radius: var(--radius-md);
}

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

/* ============================================
   Image Galleries
   ============================================ */

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.image-gallery,
.donation-images,
.project-images {
    align-items: stretch;
}

.image-gallery img,
.donation-images img,
.project-images img {
    background-color: var(--color-background-alt);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    max-height: 500px;
    margin: 0 auto;
}

.image-gallery img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    object-fit: contain;
    background-color: var(--color-background-alt);
    max-width: 100%;
    display: block;
}

.image-gallery img:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.donation-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.donation-images img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
    object-fit: contain;
    background-color: var(--color-background-alt);
    max-width: 100%;
    display: block;
}

.donation-images img:hover {
    transform: scale(1.03);
}

/* Single image in donation-images */
.donation-images:has(img:only-child) {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.project-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.project-images img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
    object-fit: contain;
    background-color: var(--color-background-alt);
    max-width: 100%;
    display: block;
}

.project-images img:hover {
    transform: scale(1.05);
}

.responsive-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
}

/* ============================================
   Projects Container
   ============================================ */

.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.projects-container > div {
    padding: var(--spacing-md);
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.projects-container > div:hover {
    box-shadow: var(--shadow-md);
}

.projects-container h3 {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-2xl);
    color: var(--color-text);
}

.centered-list {
    list-style: none;
    padding: 0;
}

.centered-list li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.6;
}

.centered-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

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

.button {
    display: inline-block;
    background-color: var(--color-accent);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-size: var(--font-size-base);
    font-weight: 400;
    text-align: center;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    margin: var(--spacing-md) 0;
}

.button:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: white;
}

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

form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

input,
textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    background-color: var(--color-background);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

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

.submit-button {
    background-color: var(--color-accent);
    color: white;
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    align-self: flex-start;
}

.submit-button:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

footer {
    background-color: var(--color-background-alt);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xxl);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-content p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer-content a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* ============================================
   Help Text
   ============================================ */

.help-text {
    margin-top: var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.help-text strong {
    font-weight: 600;
    color: var(--color-text);
}

/* ============================================
   History Section
   ============================================ */

.history-text {
    text-align: left;
    line-height: 1.7;
}

.history-text h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-2xl);
}

.history-text p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

/* ============================================
   Responsive Design - Tablet
   ============================================ */

@media screen and (max-width: 1024px) and (min-width: 769px) {
    :root {
        --font-size-5xl: 3rem;
        --font-size-4xl: 2.25rem;
        --spacing-xl: 4rem;
        --spacing-xxl: 6rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .image-gallery {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .donation-images {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .donation-images img {
        object-fit: contain;
        background-color: var(--color-background-alt);
    }
    
    .project-images {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .project-images img {
        object-fit: contain;
        background-color: var(--color-background-alt);
    }
    
    .image-gallery img {
        object-fit: contain;
        background-color: var(--color-background-alt);
    }
    
    .projects-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   Responsive Design - Mobile
   ============================================ */

@media screen and (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 3rem;
        --spacing-xxl: 4rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Mobile Navigation */
    .menu-toggle {
        display: flex;
        order: 2;
        margin-left: var(--spacing-sm);
    }
    
    nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: saturate(180%) blur(20px);
        -webkit-backdrop-filter: saturate(180%) blur(20px);
        flex-direction: column;
        padding: var(--spacing-lg) var(--spacing-md);
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        z-index: 999;
    }
    
    nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    nav a {
        width: 100%;
        text-align: left;
        padding: 1rem 1.25rem;
        font-size: var(--font-size-lg);
        font-weight: 500;
        color: var(--color-text);
        border-radius: var(--radius-sm);
        margin: 0.25rem 0;
        transition: all var(--transition-base);
        position: relative;
        display: flex;
        align-items: center;
    }
    
    nav a::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%);
        width: 3px;
        height: 0;
        background-color: var(--color-accent);
        border-radius: 0 2px 2px 0;
        transition: height var(--transition-base);
    }
    
    nav a:hover,
    nav a:active {
        background-color: var(--color-background-alt);
        color: var(--color-accent);
        padding-left: 1.5rem;
    }
    
    nav a:hover::before,
    nav a:active::before {
        height: 60%;
    }
    
    nav a::after {
        display: none;
    }
    
    .header-content {
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: var(--spacing-sm);
        padding: 0 var(--spacing-sm);
    }
    
    .logo {
        height: 36px;
        width: auto;
        order: 1;
    }
    
    .contact-button {
        order: 3;
        margin-left: auto;
        padding: 0.5rem 1rem;
        font-size: var(--font-size-xs);
        white-space: nowrap;
    }
    
    nav:not(.active) {
        display: none;
    }
    
    /* Mobile Hero */
    .hero {
        padding: var(--spacing-lg) 0;
    }
    
    .hero h1 {
        font-size: var(--font-size-4xl);
    }
    
    .hero p {
        font-size: var(--font-size-lg);
    }
    
    /* Mobile Sections */
    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-md);
    }
    
    .content {
        padding: var(--spacing-md);
    }
    
    /* Mobile Images */
    .image-gallery,
    .donation-images,
    .project-images {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .image-gallery img,
    .donation-images img,
    .project-images img {
        width: 100%;
        max-width: 100%;
        height: auto;
        object-fit: contain;
        background-color: var(--color-background-alt);
    }
    
    .hero-image {
        margin-top: var(--spacing-md);
    }
    
    /* Mobile Projects */
    .projects-container {
        grid-template-columns: 1fr;
    }
    
    /* Mobile Footer */
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    /* Mobile Forms */
    form {
        padding: 0;
    }
    
    .contact-button {
        width: 100%;
        text-align: center;
        margin-top: var(--spacing-sm);
    }
}

/* ============================================
   Responsive Design - Small Mobile
   ============================================ */

@media screen and (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
    }
    
    .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .button {
        width: 100%;
        padding: 1rem;
    }
}

/* ============================================
   Animations
   ============================================ */

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ============================================
   Utility Classes
   ============================================ */

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

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

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

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

.mb-md {
    margin-bottom: var(--spacing-md);
}

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