/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inconsolata', monospace;
    line-height: 1.6;
    color: #e5e7eb;
    background-color: #151515;
    overflow-x: hidden;
}

/* CSS Variables - Einundzwanzig Official Colors */
:root {
    --bitcoin-orange: #F7931A;
    --einundzwanzig-cyan: #00B4CF;
    --einundzwanzig-purple: #A915FF;
    --einundzwanzig-dark: #151515;
    --bitcoin-orange-light: #ffb347;
    --bitcoin-orange-dark: #cc7a16;
    --dark-bg: #151515;
    --dark-bg-secondary: #1f1f1f;
    --dark-bg-tertiary: #2a2a2a;
    --text-primary: #e5e7eb;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border-color: #404040;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(21, 21, 21, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    height: 40px;
    width: auto;
    max-width: 120px;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--bitcoin-orange);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--bitcoin-orange);
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 70%, rgba(247, 147, 26, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-logo {
    height: 240px;
    width: auto;
    max-width: 600px;
    margin-bottom: 2rem;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    color: var(--einundzwanzig-cyan);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--bitcoin-orange);
    color: #000;
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background: var(--dark-bg-tertiary);
    border-color: var(--bitcoin-orange);
    color: var(--bitcoin-orange);
    transform: translateY(-2px);
}

/* Sections */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--dark-bg-secondary);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--bitcoin-orange), var(--einundzwanzig-cyan));
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature {
    text-align: center;
    padding: 2rem;
    background: var(--dark-bg-tertiary);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
}

.feature i {
    font-size: 2.5rem;
    color: var(--bitcoin-orange);
    margin-bottom: 1rem;
}

.feature h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

/* Meetup Section */
.meetup-card {
    background: var(--dark-bg-tertiary);
    border-radius: 1rem;
    padding: 3rem;
    border: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.meetup-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.meetup-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.meetup-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.info-item i {
    color: var(--bitcoin-orange);
    font-size: 1.125rem;
    width: 20px;
}

/* Contact Section */
.contact-content {
    text-align: center;
}

.contact-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-btn {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--dark-bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.contact-btn:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.telegram-btn:hover {
    border-color: var(--einundzwanzig-cyan);
}

.portal-btn:hover {
    border-color: var(--bitcoin-orange);
}

.contact-btn i {
    font-size: 2.5rem;
    color: var(--bitcoin-orange);
}

.telegram-btn i {
    color: var(--einundzwanzig-cyan);
}

.contact-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.contact-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Bitcoin Section */
.bitcoin-content {
    max-width: 900px;
    margin: 0 auto;
}

.bitcoin-intro {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--dark-bg-tertiary);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

.bitcoin-icon {
    flex-shrink: 0;
}

.bitcoin-icon i {
    font-size: 4rem;
    color: var(--bitcoin-orange);
}

.bitcoin-text h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.bitcoin-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.bitcoin-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.bitcoin-feature {
    text-align: center;
    padding: 2rem;
    background: var(--dark-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.bitcoin-feature:hover {
    transform: translateY(-5px);
}

.bitcoin-feature i {
    font-size: 2.5rem;
    color: var(--bitcoin-orange);
    margin-bottom: 1rem;
}

.bitcoin-feature h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.bitcoin-feature p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Resources Section */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.resource-category {
    background: var(--dark-bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

.resource-category h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.resource-category h3 i {
    color: var(--bitcoin-orange);
}

.resource-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.resource-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--dark-bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.resource-link:hover {
    color: var(--einundzwanzig-purple);
    border-color: var(--einundzwanzig-purple);
    transform: translateX(5px);
}

.resource-link i {
    color: var(--bitcoin-orange);
    font-size: 1.125rem;
}

/* Footer */
.footer {
    background: var(--dark-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-logo-img {
    height: 32px;
    width: auto;
    max-width: 96px;
}

.footer-logo span {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--bitcoin-orange);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--dark-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 2rem 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

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

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

    .meetup-card {
        padding: 2rem;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }

    .bitcoin-intro {
        flex-direction: column;
        text-align: center;
    }

    .bitcoin-features {
        grid-template-columns: 1fr;
    }

    .resources-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .section {
        padding: 3rem 0;
    }

    .hero-logo {
        height: 80px;
    }

    .meetup-card,
    .resource-category,
    .feature,
    .bitcoin-feature {
        padding: 1.5rem;
    }

    .bitcoin-intro {
        padding: 1.5rem;
    }
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
    .section {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .section.visible {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Focus styles for accessibility */
.nav-link:focus,
.btn:focus,
.contact-btn:focus,
.resource-link:focus {
    outline: 2px solid var(--bitcoin-orange);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #ffffff;
        --text-secondary: #ffffff;
    }
}