/* ========================================
   Qeltrixa.shop - Corporate Stylesheet
   Строгий нейтральный стиль
   ======================================== */

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background-color: #ffffff;
}

/* === CSS Variables === */
:root {
    --primary-color: #1e3a5f;
    --secondary-color: #4a5568;
    --accent-color: #2c5282;
    --text-color: #2d3748;
    --text-light: #718096;
    --border-color: #e2e8f0;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

ul {
    list-style: none;
}

/* === Container === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === Header === */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.logo img {
    display: block;
}

.logo-text {
    font-size: 1.5rem;
}

/* === Navigation === */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: all 0.3s ease;
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-light);
}

.nav-link.active {
    color: var(--bg-white);
    background-color: var(--primary-color);
}

/* === Main Content === */
.main {
    min-height: calc(100vh - 200px);
}

/* === Hero Section === */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--bg-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-title {
    color: var(--bg-white);
    font-size: 2.75rem;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background-color: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn-full {
    width: 100%;
}

/* === Features Section === */
.features {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-white);
}

.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.section-subtitle, .section-description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.feature-card {
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.feature-text {
    color: var(--text-light);
    line-height: 1.7;
}

/* === Services Preview === */
.services-preview {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.services-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.service-item {
    padding: var(--spacing-md);
    background-color: var(--bg-white);
    border-left: 4px solid var(--accent-color);
    border-radius: 4px;
}

.service-item h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.service-item p {
    color: var(--text-light);
    margin-bottom: 0;
}

/* === Page Header === */
.page-header {
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.page-title {
    color: var(--bg-white);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 1.125rem;
    opacity: 0.95;
}

/* === Services Detailed === */
.services-detailed {
    padding: var(--spacing-xl) 0;
}

.service-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.service-card:last-child {
    margin-bottom: 0;
}

.service-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.service-description {
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-subtitle {
    font-size: 1.125rem;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    color: var(--secondary-color);
}

.service-list {
    list-style: disc;
    margin-left: 1.5rem;
    color: var(--text-light);
}

.service-list li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* === About Section === */
.about-section {
    padding: var(--spacing-xl) 0;
}

.about-content {
    margin-bottom: var(--spacing-lg);
}

.content-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.content-subtitle {
    font-size: 1.25rem;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    color: var(--secondary-color);
}

.content-text {
    color: var(--text-color);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.tech-stack {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.tech-category {
    background-color: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tech-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.tech-list {
    list-style: disc;
    margin-left: 1.5rem;
    color: var(--text-light);
}

.tech-list li {
    margin-bottom: 0.5rem;
}

/* === Achievements === */
.achievements {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.achievement-item {
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: 8px;
}

.achievement-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.achievement-label {
    color: var(--text-light);
    font-size: 1rem;
}

/* === Contacts === */
.contacts-section {
    padding: var(--spacing-xl) 0;
}

.contacts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

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

.contact-item {
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.contact-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.contact-value {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 500;
}

.contact-note {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 0.25rem;
    margin-bottom: 0;
}

.company-info {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: 8px;
}

.company-text {
    color: var(--text-color);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* === Contact Form === */
.contact-form-wrapper {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
}

.form-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

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

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.required {
    color: #e53e3e;
    margin-left: 0.25rem;
}

.form-input,
.form-textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

.form-textarea {
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
}

.form-checkbox input {
    margin-top: 0.25rem;
    cursor: pointer;
}

.form-message {
    padding: var(--spacing-sm);
    border-radius: 4px;
    display: none;
}

.form-message.success {
    display: block;
    background-color: #c6f6d5;
    color: #22543d;
    border: 1px solid #9ae6b4;
}

.form-message.error {
    display: block;
    background-color: #fed7d7;
    color: #742a2a;
    border: 1px solid #fc8181;
}

/* === Working Hours === */
.working-hours {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.hours-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.hours-item {
    padding: var(--spacing-md);
    background-color: var(--bg-white);
    border-radius: 8px;
    text-align: center;
}

.hours-label {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.hours-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0;
}

.hours-note {
    text-align: center;
    color: var(--text-light);
    margin-top: var(--spacing-md);
}

/* === CTA Section === */
.cta-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
    text-align: center;
}

.cta-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.cta-text {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
}

/* === Footer === */
.footer {
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-title {
    color: var(--bg-white);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--bg-white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-md);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

/* === Responsive Design === */

/* Tablets and below (768px) */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 2.5rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }

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

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

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-list {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--bg-white);
        border-top: 1px solid var(--border-color);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        display: none;
        padding: var(--spacing-sm) 0;
    }

    .nav-list.active {
        display: flex;
    }

    .nav-link {
        width: 100%;
        text-align: left;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .features-grid,
    .services-list,
    .tech-stack,
    .achievements,
    .contacts-grid {
        grid-template-columns: 1fr;
    }

    .service-card,
    .about-content {
        padding: var(--spacing-md);
    }

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

    .section-title {
        font-size: 1.75rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

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

    .hero-title {
        font-size: 1.75rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
    }

    .achievement-number {
        font-size: 2.5rem;
    }

    .contacts-grid {
        gap: var(--spacing-md);
    }

    .contact-form-wrapper {
        padding: var(--spacing-md);
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .nav,
    .btn,
    .cta-section,
    .contact-form {
        display: none;
    }

    body {
        color: #000;
        background: #fff;
    }

    a {
        text-decoration: underline;
    }
}