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

:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e9ecef;
    --color-text: #212529;
    --color-text-muted: #6c757d;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Hero */
.hero {
    padding: 5rem 0 4rem;
    text-align: center;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-muted);
}

/* Projects */
.projects {
    padding: 4rem 0;
}

.projects h2 {
    text-align: center;
    font-size: 1.75rem;
    margin-bottom: 2.5rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-top: 3px solid var(--card-accent, var(--color-border));
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    text-decoration: none;
    color: inherit;
}

.project-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.project-card--orange { --card-accent: #f97316; }
.project-card--purple { --card-accent: #8b5cf6; }
.project-card--green { --card-accent: #22c55e; }

.project-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 1rem;
    color: var(--card-accent);
}

.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.project-card p {
    color: var(--color-text-muted);
    flex-grow: 1;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn:hover {
    background: var(--color-border);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

/* Contacts */
.contacts {
    padding: 4rem 0;
    background: var(--color-surface);
    text-align: center;
}

.contacts h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.contacts p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

/* Footer */
footer {
    margin-top: auto;
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

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

/* Responsive */
@media (max-width: 640px) {
    .hero {
        padding: 3rem 0;
    }

    .logo {
        font-size: 2.25rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .projects,
    .contacts {
        padding: 3rem 0;
    }

    .project-card {
        padding: 1.5rem;
    }
}