/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #000000;
    --text-color: #ffffff;
    --text-secondary: #999999;
    --text-tertiary: #666666;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-hover: rgba(255, 255, 255, 0.2);
    --glass-bg: rgba(255, 255, 255, 0.02);
    --glass-bg-hover: rgba(255, 255, 255, 0.05);
    --particle-color: rgba(255, 255, 255, 0.3);
    --gradient-start: #ffffff;
    --gradient-end: #cccccc;
    --shadow-color: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #000000;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: rgba(0, 0, 0, 0.1);
    --border-color-hover: rgba(0, 0, 0, 0.2);
    --glass-bg: rgba(0, 0, 0, 0.02);
    --glass-bg-hover: rgba(0, 0, 0, 0.05);
    --particle-color: rgba(0, 0, 0, 0.3);
    --gradient-start: #000000;
    --gradient-end: #333333;
    --shadow-color: rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Particles background */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background-color: var(--particle-color);
    border-radius: 50%;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) rotate(360deg);
        opacity: 0;
    }
}

/* Theme toggle button */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--glass-bg);
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    border-color: var(--border-color-hover);
    background: var(--glass-bg-hover);
    box-shadow: 0 0 20px var(--shadow-color);
}

.theme-toggle:focus {
    outline: 2px solid var(--border-color-hover);
    outline-offset: 2px;
}

.sun-icon {
    opacity: 1;
    transition: opacity 0.3s ease;
}

.moon-icon {
    position: absolute;
    opacity: 0;
    transition: opacity 0.3s ease;
}

[data-theme="light"] .sun-icon {
    opacity: 0;
}

[data-theme="light"] .moon-icon {
    opacity: 1;
}

/* Main content */
.main-content {
    position: relative;
    z-index: 10;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
}

/* Hero group - centers hero, subtitle, and join button as one unit */
.hero-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    width: 100%;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 4rem;
}

.logo {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding-bottom: 0.2rem;
}

.tagline {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    margin-top: 25px;
}

/* CTA Section */
.cta-section {
    margin: 1.5rem 0;
}

.join-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    padding: 1rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px var(--shadow-color);
    min-width: 200px;
}

.join-button:hover {
    color: var(--text-color);
    border-color: var(--border-color-hover);
    background: var(--glass-bg-hover);
    transform: translateY(-1px);
}

.join-button svg {
    width: 20px;
    height: 20px;
}

/* Footer */
.footer {
    margin-top: auto;
    padding-top: 2rem;
}

.social-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    align-items: center;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
}

.social-link:hover {
    color: var(--text-color);
    border-color: var(--border-color-hover);
    background: var(--glass-bg-hover);
}

.social-link svg {
    width: 18px;
    height: 18px;
}

/* Responsive design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .logo {
        font-size: 2.5rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .form-container {
        padding: 1.5rem;
    }
    
    .form-title {
        font-size: 1.5rem;
    }
    
    .social-links {
        flex-direction: column;
        gap: 1rem;
    }
    
    .social-link {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 2rem;
    }
    
    .form-container {
        padding: 1rem;
    }
    
    .airtable-embed-iframe {
        height: 600px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus states for accessibility */
.social-link:focus {
    outline: 2px solid var(--border-color-hover);
    outline-offset: 2px;
}

/* Additional hover effects */
.form-container:hover {
    border-color: var(--border-color-hover);
    background: var(--glass-bg-hover);
}

/* Subtle animation for form container */
.form-container {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header {
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}