/* ---------------------------------- */
/* ----- DESIGN SYSTEM: Calm Growth ----- */
/* ---------------------------------- */

/* 1. TYPOGRAPHY */
@import url('https://fonts.googleapis.com/css2?family=Lora:wght@500;600&family=Work+Sans:wght@400;500&display=swap');

:root {
    /* 2. COLORS */
    --primary: #059669;    /* Waldgrün */
    --secondary: #0d9488;  /* Teal */
    --accent: #f97316;     /* Orange */
    --background: #f0fdf4; /* Sehr helles Grün */
    --surface: #ffffff;
    --card: #ecfdf5;
    --text: #064e3b;
    --muted: #6b7280;
    --white: #ffffff;
    --border-color: #d1fae5;

    /* 3. FONTS */
    --font-headings: 'Lora', serif;
    --font-body: 'Work Sans', sans-serif;

    /* 4. SPACING & LAYOUT */
    --container-width: 1100px;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --border-radius: 8px;
}

/* ---------------------------------- */
/* ----- GLOBAL STYLES & RESETS ----- */
/* ---------------------------------- */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 2rem;
}

body {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--text);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: var(--font-headings);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.125rem; margin-bottom: var(--spacing-lg); }
h3 { font-size: 1.375rem; }

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

a {
    color: var(--secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
}

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

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

/* For animation */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}


/* ---------------------------------- */
/* ----- UI ELEMENTS & COMPONENTS ----- */
/* ---------------------------------- */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

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

.btn-accent {
    background-color: var(--accent);
    color: var(--white);
}

.card {
    background-color: var(--card);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.07), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}
.split.reverse { grid-template-columns: 1fr 1fr; }
.split.reverse > *:first-child { grid-column: 2; }
.split.reverse > *:last-child { grid-column: 1; grid-row: 1; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---------------------------------- */
/* ----- HEADER & NAVIGATION ----- */
/* ---------------------------------- */

.site-header {
    background-color: var(--background);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-headings);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--text);
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-lg);
}

.main-nav a {
    color: var(--text);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-sm) 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width 0.3s ease;
}

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

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

/* ---------------------------------- */
/* ----- SECTION STYLING ----- */
/* ---------------------------------- */

/* S1: Hero */
.hero-section { background-color: var(--background); padding: var(--spacing-xl) 0; }
.hero-text .subtitle { font-size: 1.2rem; color: var(--muted); max-width: 50ch; margin-bottom: var(--spacing-lg); }
.hero-image img { border-radius: var(--border-radius); }

/* S2: Philosophy */
.philosophy-section { background-color: var(--surface); }
.quote-block { border-left: 3px solid var(--primary); padding-left: var(--spacing-lg); margin: var(--spacing-lg) auto; max-width: 65ch; }
.quote-block blockquote p { font-family: var(--font-headings); font-size: 1.5rem; font-style: italic; }
.quote-block figcaption { text-align: right; color: var(--muted); }
.philosophy-text { max-width: 70ch; margin: 0 auto; }

/* S3: ETFs */
.etf-section { background-color: var(--card); }
.etf-section .intro-text { max-width: 60ch; margin: 0 auto var(--spacing-xl) auto; }

/* S4: Compound Interest */
.compound-section { background-color: var(--surface); }
.compound-visual { 
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing-xl);
}
.chart-image { max-width: 500px; flex-shrink: 0; }
.compound-table table { border-collapse: collapse; width: 300px; margin: 0 auto; text-align: left;}
.compound-table th, .compound-table td { padding: 0.75rem; border-bottom: 1px solid var(--border-color); }
.compound-table th { background-color: var(--card); }
.disclaimer { font-size: 0.9rem; color: var(--muted); margin-top: var(--spacing-lg); }

/* S5: MSCI World */
.msci-section { background-color: var(--card); }
.msci-image img { border-radius: var(--border-radius); }

/* S6: Steps */
.steps-section { background-color: var(--surface); }
.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    position: relative;
}
.steps-container::before {
    content: '';
    position: absolute;
    top: 35px;
    left: 10%;
    width: 80%;
    height: 2px;
    background-color: var(--border-color);
    z-index: 0;
}
.step { position: relative; }
.step-number {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: var(--card);
    color: var(--primary);
    display: grid;
    place-items: center;
    font-size: 2rem;
    font-family: var(--font-headings);
    border: 3px solid var(--primary);
    margin: 0 auto var(--spacing-md) auto;
    z-index: 1;
    position: relative;
}

/* S7: KI */
.ki-section { background-color: var(--card); }
.ki-image img { border-radius: var(--border-radius); }

/* S8: Timing */
.timing-section { background-color: var(--surface); }
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}
.comparison-column { padding: var(--spacing-lg); border-radius: var(--border-radius); }
.comparison-column.timing-bad { background-color: #fee2e2; border: 2px solid #ef4444; }
.comparison-column.timing-good { background-color: var(--card); border: 2px solid var(--primary); }
.comparison-column ul { padding-left: var(--spacing-md); }
.comparison-column ul li { list-style-type: '— '; padding-left: var(--spacing-sm); margin-bottom: var(--spacing-sm); }
.conclusion { text-align: center; margin-top: var(--spacing-xl); font-family: var(--font-headings); font-size: 1.25rem; }

/* S9: Concerns */
.concerns-section { background-color: var(--card); }

/* S10: Timeline */
.timeline-section { background-color: var(--surface); }
.timeline {
    position: relative;
    max-width: 800px;
    margin: var(--spacing-xl) auto 0;
}
.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--primary);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
}
.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
}
.timeline-item:nth-child(odd) { left: 0; }
.timeline-item:nth-child(even) { left: 50%; }
.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--surface);
    border: 4px solid var(--primary);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}
.timeline-item:nth-child(even)::after { left: -10px; }
.timeline-content {
    padding: 20px 30px;
    background-color: var(--card);
    position: relative;
    border-radius: var(--border-radius);
}
.timeline-item:nth-child(odd) .timeline-content { text-align: right; }

/* S11: FAQ */
.faq-section { background-color: var(--card); }
.accordion { max-width: 800px; margin: 0 auto; }
.accordion details {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
}
.accordion summary {
    font-weight: 500;
    font-size: 1.125rem;
    cursor: pointer;
    list-style: none; /* For Safari */
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.accordion summary::-webkit-details-marker { display: none; } /* For Chrome */
.accordion summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform 0.2s ease;
}
.accordion details[open] summary::after {
    transform: rotate(45deg);
}
.accordion details p { padding-top: var(--spacing-md); color: var(--muted); }

/* S12: Contact */
.contact-section { background-color: var(--surface); }
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}
.contact-info p { margin-bottom: var(--spacing-sm); }
.map-container { margin-top: var(--spacing-lg); border-radius: var(--border-radius); overflow: hidden; }
.contact-form .form-group { margin-bottom: var(--spacing-md); }
.contact-form label { display: block; margin-bottom: var(--spacing-sm); font-weight: 500; }
.contact-form input, .contact-form textarea, .contact-form select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--surface);
    font-family: var(--font-body);
    font-size: 1rem;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.2);
}
.form-group-checkbox { display: flex; align-items: center; gap: var(--spacing-sm); }
.form-group-checkbox label { margin-bottom: 0; }
.btn.full-width { width: 100%; padding: 1rem; }

/* ---------------------------------- */
/* ----- FOOTER ----- */
/* ---------------------------------- */

.site-footer-main {
    background-color: var(--primary);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23065f46' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}
.footer-col h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}
.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}
.footer-col a {
    color: #a7f3d0; /* light green */
}
.footer-col a:hover {
    color: var(--white);
    text-decoration: underline;
}
.footer-logo {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}
.footer-logo:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid #065f46; /* darker green */
    padding-top: var(--spacing-lg);
    text-align: center;
    font-size: 0.9rem;
    color: #a7f3d0;
}
.footer-bottom p { margin: 0; }
.footer-bottom .disclaimer { margin-top: var(--spacing-sm); font-style: italic; }

/* ---------------------------------- */
/* ----- RESPONSIVE DESIGN ----- */
/* ---------------------------------- */

@media (max-width: 900px) {
    .split, .split.reverse, .contact-grid, .comparison-grid {
        grid-template-columns: 1fr;
    }
    .split.reverse > *:first-child { grid-column: 1; grid-row: 1;}
    .split.reverse > *:last-child { grid-column: 1; grid-row: 2; }
    .hero-text, .msci-text { text-align: center; }
    
    .timeline::after { left: 30px; }
    .timeline-item { width: 100%; padding-left: 70px; padding-right: 25px; }
    .timeline-item:nth-child(even) { left: 0; }
    .timeline-item::after { left: 20px; }
    .timeline-item:nth-child(odd) .timeline-content { text-align: left; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    
    .main-nav {
        position: fixed;
        inset: 0 0 0 30%;
        flex-direction: column;
        padding: min(20vh, 10rem) 2em;
        background: var(--surface);
        transform: translateX(100%);
        transition: transform 350ms ease-out;
        z-index: 100;
    }
    .main-nav[data-visible="true"] {
        transform: translateX(0%);
    }
    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .mobile-nav-toggle {
        display: block;
        position: relative;
        z-index: 999;
        background: transparent;
        border: 0;
        width: 2rem;
        aspect-ratio: 1;
        cursor: pointer;
    }
    .hamburger {
        position: absolute;
        width: 1.5rem;
        height: 2px;
        background-color: var(--text);
        transition: transform 250ms ease-in-out;
    }
    .hamburger::before, .hamburger::after {
        content: '';
        position: absolute;
        width: 1.5rem;
        height: 2px;
        background-color: var(--text);
        transition: transform 250ms ease-in-out, opacity 250ms linear;
    }
    .hamburger::before { transform: translateY(-7px); }
    .hamburger::after { transform: translateY(7px); }
    
    .mobile-nav-toggle[aria-expanded="true"] .hamburger {
        transform: rotate(45deg);
    }
    .mobile-nav-toggle[aria-expanded="true"] .hamburger::before {
        opacity: 0;
    }
    .mobile-nav-toggle[aria-expanded="true"] .hamburger::after {
        transform: rotate(-90deg) translate(-7px);
    }
    .header-container .btn-primary { display: none; }
}