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

html {
    width: 100%;
    height: 100%;
    background: #0d0d0d;
}

:root {
    /* Grayscale Colors */
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #262626;
    --bg-hover: rgba(255, 255, 255, 0.05);
    --bg-active: rgba(255, 255, 255, 0.08);
    
    /* Text Colors */
    --text-primary: #e6e6e6;
    --text-secondary: #bfbfbf;
    --text-tertiary: #999999;
    --text-muted: #666666;
    
    /* Border Colors */
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-normal: rgba(255, 255, 255, 0.15);
    --border-strong: rgba(255, 255, 255, 0.25);
    
    /* Accent (subtle gray) */
    --accent-bg: rgba(255, 255, 255, 0.1);
    --accent-border: rgba(255, 255, 255, 0.2);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: radial-gradient(circle at center, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
    width: 100%;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeIn 0.8s ease;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.logo {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.brand {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.description {
    font-size: 1.125rem;
    color: var(--text-tertiary);
    max-width: 600px;
    margin: 0 auto;
}

/* Preview Section */
.preview-container {
    width: 100%;
    max-width: 900px;
    margin-bottom: var(--spacing-2xl);
    animation: fadeIn 1s ease 0.2s backwards;
}

.preview-placeholder {
    background: var(--bg-secondary);
    border: 1px solid var(--border-normal);
    border-radius: var(--radius-lg);
    aspect-ratio: 16/9;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
}

.preview-placeholder:hover {
    border-color: var(--border-strong);
    background: var(--bg-tertiary);
}

.preview-icon {
    color: var(--text-muted);
}

.preview-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}

/* Features Section */
.features {
    width: 100%;
    max-width: 1000px;
    margin-bottom: var(--spacing-2xl);
    animation: fadeIn 1.2s ease 0.4s backwards;
}

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

.feature {
    background: transparent;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: visible;
}

.feature:hover {
    background: var(--bg-secondary);
    border: 1px solid var(--border-normal);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 10;
}


.feature-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: background var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal);
}

.feature:hover .feature-icon,
.feature.expanded .feature-icon {
    background: var(--accent-border);
    border-color: var(--border-normal);
    color: var(--text-primary);
}

.feature h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    transition: color var(--transition-fast);
}

.feature:hover h3 {
    color: #ffffff;
}

.feature-summary {
    font-size: 0.9375rem;
    color: var(--text-tertiary);
    line-height: 1.5;
}

/* Expandable Feature Content */
.feature-expanded {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.25s ease;
}

.feature-expanded-inner {
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    line-height: 1.6;
    scrollbar-gutter: stable;
}

.feature:hover .feature-expanded,
.feature.expanded .feature-expanded {
    max-height: 320px;
    opacity: 1;
}

.feature:hover .feature-expanded-inner,
.feature.expanded .feature-expanded-inner {
    overflow-y: auto;
}

.expanded-text {
    font-size: 0.875rem;
}

/* Scrollbar for expanded content */
.feature-expanded::-webkit-scrollbar {
    width: 4px;
}

.feature-expanded::-webkit-scrollbar-track {
    background: transparent;
}

.feature-expanded::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
}

.feature-expanded::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Mobile expanded state */
.feature.expanded {
    background: var(--bg-secondary);
    border: 1px solid var(--border-normal);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 10;
}

.feature.expanded .feature-icon {
    background: var(--accent-border);
    border-color: var(--border-normal);
    color: var(--text-primary);
    transform: scale(1.05);
}

.feature.expanded h3 {
    color: #ffffff;
}

/* Waitlist Section */
.waitlist {
    width: 100%;
    max-width: 600px;
    text-align: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-normal);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    animation: fadeIn 1.4s ease 0.6s backwards;
}

.waitlist h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.waitlist-subtext {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

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

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

input[type="email"] {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-primary);
    border: 1px solid var(--border-normal);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    outline: none;
}

input[type="email"]::placeholder {
    color: var(--text-muted);
}

input[type="email"]:focus {
    border-color: var(--border-strong);
    background: var(--bg-tertiary);
}

.submit-btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.submit-btn:hover {
    background: var(--text-secondary);
    transform: translateY(-1px);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn.loading {
    pointer-events: none;
}

.btn-text {
    display: inline-block;
    transition: opacity var(--transition-fast);
}

.submit-btn.loading .btn-text {
    opacity: 0;
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--bg-primary);
    border-top-color: transparent;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.8s linear infinite;
    transition: opacity var(--transition-fast);
}

.submit-btn.loading .btn-loader {
    opacity: 1;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.form-message {
    font-size: 0.875rem;
    min-height: 1.25rem;
    transition: all var(--transition-normal);
}

.form-message.success {
    color: var(--text-primary);
}

.form-message.error {
    color: var(--text-tertiary);
}

.platforms {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-subtle);
}

.platform-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.platform-badges {
    display: flex;
    gap: var(--spacing-xs);
}

.badge {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    background: var(--accent-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

/* Footer */
.footer {
    margin-top: var(--spacing-2xl);
    text-align: center;
    animation: fadeIn 1.6s ease 0.8s backwards;
}

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .brand {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1.25rem;
    }
    
    .description {
        font-size: 1rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .form-group {
        flex-direction: column;
    }
    
    .submit-btn {
        width: 100%;
    }
    
    .waitlist {
        padding: var(--spacing-lg);
    }
    
    .platforms {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .logo {
        width: 48px;
        height: 48px;
    }
    
    .brand {
        font-size: 1.75rem;
    }
    
    .logo-container {
        gap: var(--spacing-xs);
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
    scrollbar-gutter: stable both-edges;
}

/* Selection styling */
::selection {
    background: var(--accent-bg);
    color: var(--text-primary);
}

::-moz-selection {
    background: var(--accent-bg);
    color: var(--text-primary);
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
    background-clip: padding-box;
}