/*
 * 173frequency.com - Main Stylesheet
 * Techno-minimalistisches Design mit Frequenz-Ästhetik
 */

/* ===== CSS Variables ===== */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #0A0A0A;
    --bg-secondary: #111111;
    --bg-tertiary: #1A1A1A;
    --text-primary: #E0E0E0;
    --text-secondary: #999999;
    --text-dim: #666666;
    --accent-primary: #00FF41;
    --accent-secondary: #00CC33;
    --accent-warning: #FF1730;
    --accent-blue: #1730FF;
    --border-color: #333333;

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 5rem;

    /* Layout */
    --header-height: 80px;
    --content-width: 90vw;
    --max-width: 1600px;

    /* Animation */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

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

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

/* ===== Background Animation ===== */
.frequency-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.02;
}

.frequency-bg::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        var(--accent-primary) 2px,
        var(--accent-primary) 4px
    );
    animation: scan 8s linear infinite;
}

@keyframes scan {
    0% { transform: translateY(0); }
    100% { transform: translateY(20px); }
}

/* ===== Header ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.header-inner {
    width: var(--content-width);
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.frequency-number {
    color: var(--accent-primary);
    font-weight: 700;
}

.dot-com {
    color: var(--text-dim);
    font-size: 0.9em;
}

.main-nav {
    display: flex;
    gap: var(--space-xl);
}

.main-nav a {
    color: var(--text-secondary);
    font-weight: 400;
    transition: color var(--transition-fast);
}

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

/* ===== Main Content ===== */
main {
    margin-top: var(--header-height);
}

.hero,
.about-section,
.purchase-section,
.sample-section {
    padding: var(--space-xxl) 0;
}

.hero-inner,
.section-inner {
    width: var(--content-width);
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ===== Hero Section ===== */
.hero {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    position: relative;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xxl);
    align-items: center;
}

.book-category {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-primary);
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.book-title {
    font-weight: 700;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.book-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.book-author {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.book-teaser {
    margin-bottom: var(--space-xl);
}

.book-teaser p {
    font-size: 1.125rem;
    line-height: 1.8;
}

.cta-buttons {
    display: flex;
    gap: var(--space-lg);
}

.book-visual {
    position: relative;
}

.book-cover-wrapper {
    position: relative;
    display: inline-block;
}

.book-cover {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.frequency-scanner-hint {
    position: absolute;
    bottom: 30px;
    right: 30px;
    background: rgba(0, 0, 0, 0.8);
    padding: var(--space-sm) var(--space-md);
    border-radius: 20px;
    border: 1px solid var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-primary);
}

/* ===== About Section ===== */
.about-section {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xxl);
}

.about-book h2 {
    margin-bottom: var(--space-xl);
}

.about-book p {
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
}

.book-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
    padding: var(--space-xl);
    background: var(--bg-tertiary);
    border-radius: 8px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.detail-label {
    font-size: 0.875rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-value {
    color: var(--text-primary);
    font-weight: 500;
}

.about-author {
    background: var(--bg-tertiary);
    padding: var(--space-xl);
    border-radius: 8px;
    height: fit-content;
}

.about-author h3 {
    margin-bottom: var(--space-lg);
    color: var(--accent-primary);
}

.author-info p {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

/* ===== Purchase Section ===== */
.purchase-section {
    background: var(--bg-primary);
}

.purchase-section h2 {
    text-align: center;
    margin-bottom: var(--space-xxl);
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.format-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--space-xl);
    text-align: center;
    position: relative;
    transition: all var(--transition-normal);
}

.format-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px rgba(0, 255, 65, 0.1);
}

.format-card.featured {
    border-color: var(--accent-primary);
}

.format-badge {
    position: absolute;
    top: -12px;
    right: var(--space-lg);
    background: var(--accent-primary);
    color: var(--bg-primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.format-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.format-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin: var(--space-md) 0;
}

.format-info {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.format-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* ===== Sample Section ===== */
.sample-section {
    background: var(--bg-secondary);
}

.sample-section h2 {
    text-align: center;
    margin-bottom: var(--space-xxl);
}

.sample-content {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-tertiary);
    padding: var(--space-xxl);
    border-radius: 8px;
}

.sample-content h3 {
    margin-bottom: var(--space-xl);
    color: var(--accent-primary);
}

.sample-text {
    font-size: 1.125rem;
    line-height: 1.8;
}

.sample-text h4 {
    margin: var(--space-xl) 0 var(--space-lg);
    color: var(--text-primary);
}

.sample-text ul {
    margin: var(--space-md) 0;
    padding-left: var(--space-xl);
}

.sample-text li {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.fact-box {
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent-primary);
    padding: var(--space-lg);
    margin: var(--space-xl) 0;
}

.fact-box p {
    margin: 0;
    color: var(--text-primary);
}

.chapter-fade {
    text-align: center;
    margin: var(--space-xxl) 0;
    color: var(--text-dim);
    font-size: 1.5rem;
}

.read-more {
    text-align: center;
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-top: var(--space-xl);
}

.read-more p {
    margin-bottom: var(--space-lg);
    font-size: 1.25rem;
    color: var(--text-primary);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    border-radius: 4px;
    font-weight: 500;
    font-size: 1rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    text-decoration: none;
    text-align: center;
}

.btn:hover {
    transform: translateY(-2px);
}

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

.btn-primary:hover {
    background: var(--accent-secondary);
    box-shadow: 0 5px 15px rgba(0, 255, 65, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* ===== Footer ===== */
.site-footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-xl) 0;
    margin-top: var(--space-xxl);
}

.footer-inner {
    width: var(--content-width);
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.footer-section p {
    margin: 0;
    color: var(--text-secondary);
}

.footer-links a {
    color: var(--text-secondary);
    margin: 0 var(--space-md);
}

.separator {
    color: var(--text-dim);
}

.frequency-footer {
    text-align: center;
    font-family: var(--font-mono);
    color: var(--text-dim);
    font-size: 0.875rem;
}

/* ===== Frequency Triggers ===== */
.frequency-trigger {
    color: var(--accent-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.frequency-trigger:hover {
    text-shadow: 0 0 10px var(--accent-primary);
}

/* ===== Easter Egg Elements ===== */
#frequency-scanner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.scanner-device {
    background: var(--bg-secondary);
    border: 3px solid var(--accent-primary);
    border-radius: 10px;
    padding: var(--space-xl);
    min-width: 500px;
    box-shadow: 0 0 50px rgba(0, 255, 65, 0.5);
}

.scanner-screen {
    background: #000;
    border: 2px solid var(--accent-primary);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
    font-family: var(--font-mono);
    min-height: 200px;
}

.scanner-frequency-display {
    font-size: 3rem;
    color: var(--accent-primary);
    text-align: center;
    text-shadow: 0 0 20px currentColor;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.scanner-waterfall {
    height: 100px;
    background: linear-gradient(
        to bottom,
        var(--accent-blue) 0%,
        var(--accent-primary) 50%,
        var(--accent-warning) 100%
    );
    opacity: 0.2;
    margin: var(--space-md) 0;
}

.scanner-message {
    color: var(--accent-primary);
    text-align: center;
    margin-top: var(--space-md);
    font-size: 0.875rem;
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .book-visual {
        order: -1;
        margin-bottom: var(--space-xl);
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .format-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    :root {
        --content-width: 95vw;
        --space-xxl: 3rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    .main-nav {
        gap: var(--space-lg);
    }

    .cta-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .book-details {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
}

/* ===== Legal Pages ===== */
.legal-section {
    padding: var(--space-xxl) 0;
    min-height: calc(100vh - var(--header-height) - 200px);
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
}

.legal-content h2 {
    color: var(--accent-primary);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.legal-content h3 {
    color: var(--text-primary);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-md);
}

.legal-content p {
    margin-bottom: var(--space-md);
    line-height: 1.8;
}

.legal-content ul {
    margin: var(--space-md) 0;
    padding-left: var(--space-xl);
}

.legal-content li {
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

.toc {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.toc h3 {
    margin-top: 0;
    color: var(--accent-primary);
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc li {
    margin: var(--space-sm) 0;
}

.toc a {
    display: block;
    padding: var(--space-xs) 0;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.toc a:hover {
    color: var(--accent-primary);
    padding-left: var(--space-md);
}

.cookie-settings {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-primary);
    border-radius: 8px;
    padding: var(--space-xl);
    margin: var(--space-xl) 0;
    text-align: center;
}

.cookie-settings h3 {
    margin-top: 0;
}

.cookie-settings .btn {
    margin: var(--space-sm);
}

.update-info {
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent-warning);
    padding: var(--space-lg);
    margin-top: var(--space-xl);
}

.update-info p {
    margin: var(--space-xs) 0;
}

.legal-date {
    text-align: center;
    color: var(--text-dim);
    margin-top: var(--space-xl);
    font-style: italic;
}

.frequency-hint {
    text-align: center;
    color: var(--text-dim);
    font-style: italic;
    margin-top: var(--space-xl);
    opacity: 0.6;
}

/* ===== Footnotes with Tooltips ===== */
.footnote {
    position: relative;
    cursor: help;
    color: var(--accent-primary);
    font-size: 0.85em;
    margin-left: 2px;
    transition: all var(--transition-fast);
}

.footnote:hover {
    color: var(--accent-secondary);
}

.footnote[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: 6px;
    font-size: 0.875rem;
    line-height: 1.4;
    white-space: normal;
    width: max-content;
    max-width: 300px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    z-index: 10;
    font-weight: normal;
    text-align: left;
}

.footnote[data-tooltip]:hover::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--border-color);
    z-index: 10;
}

/* Mobile: Show footnotes as clickable */
@media (max-width: 768px) {
    .footnote[data-tooltip]::after {
        display: none;
    }

    .footnote[data-tooltip].active::after {
        display: block;
        position: fixed;
        bottom: auto;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 90vw;
        max-width: 400px;
        font-size: 1rem;
        padding: var(--space-lg);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

    .footnote[data-tooltip].active::before {
        display: none;
    }
}

/* ===== Cookie Banner ===== */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--accent-primary);
    padding: var(--space-lg);
    transform: translateY(100%);
    transition: transform var(--transition-normal);
    z-index: 1500;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    width: var(--content-width);
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-xl);
}

.cookie-text {
    flex: 1;
}

.cookie-buttons {
    display: flex;
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-buttons {
        width: 100%;
        flex-direction: column;
    }
}

/* ===== Hamburger Menu ===== */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1100;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--accent-primary);
    transition: all var(--transition-normal);
    border-radius: 2px;
}

.hamburger:hover span {
    background: var(--accent-secondary);
}

/* Hamburger animation when active */
.hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 280px;
        height: calc(100vh - var(--header-height));
        background: var(--bg-secondary);
        backdrop-filter: blur(10px);
        border-left: 1px solid var(--border-color);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: var(--space-xl) var(--space-lg);
        transition: right 0.3s ease;
        overflow-y: auto;
        z-index: 1000;
    }

    .main-nav.active {
        right: 0;
    }

    .main-nav a {
        width: 100%;
        padding: var(--space-md) 0;
        border-bottom: 1px solid var(--border-color);
        font-size: 1.125rem;
    }

    .main-nav a:last-child {
        border-bottom: none;
    }
}

/* Tablet breakpoint */
@media (max-width: 1024px) and (min-width: 769px) {
    .main-nav {
        gap: var(--space-md);
    }

    .main-nav a {
        font-size: 0.95rem;
    }
}

/* Ende der Frequenz-Übertragung */