:root {
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #0f1420;
    --color-bg-tertiary: #151b2b;
    --color-accent: #4a90e2;
    --color-accent-hover: #5ba3ff;
    --color-text-primary: #e4e7eb;
    --color-text-secondary: #a0a8b5;
    --color-text-muted: #6b7280;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-glass-bg: rgba(21, 27, 43, 0.6);
    --color-glass-border: rgba(255, 255, 255, 0.1);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Monaco", "Cascadia Code", "Roboto Mono", monospace;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-base);
}

.header.scrolled {
    background: rgba(10, 14, 26, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-menu a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-text-primary);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
}

main {
    padding-top: 72px;
}

.hero {
    padding: var(--spacing-3xl) 0;
    text-align: center;
    min-height: 70vh;
    display: flex;
    align-items: center;
    opacity: 0;
    animation: fadeIn var(--transition-slow) forwards;
}

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--color-text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

.principles {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
}

.principle-card {
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: 12px;
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    opacity: 0;
    animation: fadeInUp var(--transition-slow) forwards;
}

.principle-card:nth-child(1) { animation-delay: 100ms; }
.principle-card:nth-child(2) { animation-delay: 200ms; }
.principle-card:nth-child(3) { animation-delay: 300ms; }
.principle-card:nth-child(4) { animation-delay: 400ms; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.principle-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
    box-shadow: 0 8px 32px rgba(74, 144, 226, 0.1);
}

.principle-icon {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-base);
}

.principle-card:hover .principle-icon {
    transform: scale(1.1);
}

.principle-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.principle-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.development-status {
    padding: var(--spacing-3xl) 0;
}

.development-status h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    font-weight: 600;
}

.status-grid {
    display: grid;
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.status-item {
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.status-item:hover {
    border-color: var(--color-accent);
}

.status-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.status-label {
    font-weight: 500;
    font-size: 1rem;
}

.status-value {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.progress-bar {
    height: 6px;
    background: var(--color-bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    border-radius: 3px;
    transition: width var(--transition-slow);
}

.page-hero {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    text-align: center;
}

.page-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
}

.content-section {
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.content-block {
    margin-bottom: var(--spacing-3xl);
}

.content-block h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.content-block p {
    color: var(--color-text-secondary);
    line-height: 1.75;
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    color: var(--color-text-secondary);
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    position: relative;
    line-height: 1.7;
}

.feature-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.value-item {
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
}

.value-item h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.value-item p {
    font-size: 0.9rem;
    margin: 0;
}

.contact-section {
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
}

.contact-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-3xl);
}

.contact-info h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.contact-info p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.contact-form-container {
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: 12px;
    padding: var(--spacing-xl);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group textarea {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-button {
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: 8px;
    padding: var(--spacing-sm) var(--spacing-xl);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    align-self: flex-start;
}

.submit-button:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

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

.footer {
    background: var(--color-bg-tertiary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-3xl);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-weight: 600;
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

@media (max-width: 768px) {
    .nav-menu {
        gap: var(--spacing-lg);
    }

    .hero {
        padding: var(--spacing-2xl) 0;
        min-height: 60vh;
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

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

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

@media (max-width: 480px) {
    .nav-menu {
        gap: var(--spacing-md);
    }

    .nav-menu a {
        font-size: 0.875rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}