/* ===================================
   kotovasia5120.ru — Основные стили
   =================================== */

/* CSS Variables */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-background: #ffffff;
    --color-background-alt: #f8fafc;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

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

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

.nav-menu a {
    color: var(--color-text-light);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--color-background) 0%, var(--color-background-alt) 100%);
    padding-top: 80px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.section-alt {
    background-color: var(--color-background-alt);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--color-text);
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.features-list {
    text-align: left;
    max-width: 500px;
    margin: 2rem auto 0;
}

.features-list li {
    padding: 0.5rem 0;
    font-size: 1.125rem;
}

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

.project-card {
    background: var(--color-background);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.project-card p {
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-background-alt);
    color: var(--color-text-light);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Contact Section */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-content p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.contact-list {
    text-align: left;
    background: var(--color-background-alt);
    padding: 2rem;
    border-radius: var(--radius);
}

.contact-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
}

.contact-list li:last-child {
    border-bottom: none;
}

.contact-list strong {
    color: var(--color-text);
    margin-right: 0.5rem;
}

/* Footer */
.footer {
    background-color: var(--color-text);
    color: var(--color-background);
    padding: 3rem 0;
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.875rem;
    }

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

@media (max-width: 480px) {
    .nav-menu {
        display: none;
    }

    .hero-title {
        font-size: 1.5rem;
    }
}