/* ============================================
COMPONENT: Main Styles
Description: Modern, responsive stylesheet for Drakonova Medical landing page
Version: 1.0
============================================ */

/* === CSS VARIABLES === */
:root {
    --color-primary: #0066cc;
    --color-primary-dark: #0052a3;
    --color-primary-light: #3385d6;
    --color-secondary: #00a86b;
    --color-accent: #ff6b35;
    --color-text: #2c3e50;
    --color-text-light: #6c757d;
    --color-background: #ffffff;
    --color-background-light: #f8f9fa;
    --color-border: #e0e0e0;
    --color-success: #28a745;
    --color-error: #dc3545;
    
    --spacing-unit: 8px;
    --spacing-xs: calc(var(--spacing-unit) * 1);
    --spacing-sm: calc(var(--spacing-unit) * 2);
    --spacing-md: calc(var(--spacing-unit) * 3);
    --spacing-lg: calc(var(--spacing-unit) * 4);
    --spacing-xl: calc(var(--spacing-unit) * 6);
    --spacing-xxl: calc(var(--spacing-unit) * 8);
    
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    --font-size-hero: 40px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    --transition-base: 0.3s ease;
    --transition-fast: 0.15s ease;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
}

/* === RESET & BASE STYLES === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* === SITE HEADER === */
.site-header {
    background-color: var(--color-background);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.header-container {
    position: relative;
}

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

.logo {
    flex: 1;
    min-width: 200px;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.logo-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    font-weight: var(--font-weight-normal);
}

.main-navigation {
    display: none;
}

.main-navigation.mobile-menu-open {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.main-navigation.mobile-menu-open .nav-list {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: stretch;
}

.main-navigation.mobile-menu-open .nav-link {
    display: block;
    padding: var(--spacing-md);
    text-align: center;
}

.mobile-menu-toggle.mobile-menu-active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.mobile-menu-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.mobile-menu-active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

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

.nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

.nav-link-cta {
    background-color: var(--color-primary);
    color: var(--color-background);
    padding: var(--spacing-sm) var(--spacing-lg);
}

.nav-link-cta:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-background);
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* === HERO SECTION === */
.hero-section {
    background: linear-gradient(135deg, #e3f2fd 0%, #ffffff 100%);
    padding: var(--spacing-xxl) var(--spacing-md);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-hero);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--color-secondary);
    color: var(--color-background);
    border-radius: 50%;
    font-weight: var(--font-weight-bold);
    font-size: 14px;
}

.hero-image-wrapper {
    text-align: center;
}

.hero-image {
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 100%;
    height: auto;
}

.cta-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.cta-button-primary {
    background-color: var(--color-primary);
    color: var(--color-background);
}

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

/* === SECTIONS === */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xxl) var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

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

/* === FEATURES SECTION === */
.features-section {
    background-color: var(--color-background-light);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon-wrapper {
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: center;
}

.feature-icon {
    width: 64px;
    height: 64px;
    object-fit: contain;
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

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

/* === PRODUCTS SECTION === */
.products-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.product-card {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.product-image-wrapper {
    width: 100%;
    height: 300px;
    overflow: hidden;
    background-color: var(--color-background-light);
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.product-card:hover .product-image {
    transform: scale(1.05);
}

.product-info {
    padding: var(--spacing-xl);
}

.product-name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

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

.product-specs {
    list-style: none;
    padding: 0;
}

.product-specs li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text);
    position: relative;
    padding-left: var(--spacing-lg);
}

.product-specs li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: var(--font-weight-bold);
}

/* === CERTIFICATIONS SECTION === */
.certifications-section {
    background-color: var(--color-background-light);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.certification-item {
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.certification-badge {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-background);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.certification-text {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.certifications-info {
    text-align: center;
    color: var(--color-text-light);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

/* === ORDER FORM SECTION === */
.order-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
}

.order-form-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

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

.form-label {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    font-size: var(--font-size-base);
}

.form-input,
.form-select,
.form-textarea {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    background-color: var(--color-background);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--color-error);
}

.form-error {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    min-height: 20px;
}

.form-group-checkbox {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.form-checkbox {
    margin-top: 4px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-label-checkbox {
    font-weight: var(--font-weight-normal);
    cursor: pointer;
}

.cta-button-submit {
    width: 100%;
    margin-top: var(--spacing-md);
}

.form-success {
    background-color: #d4edda;
    color: #155724;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
    text-align: center;
}

/* === SITE FOOTER === */
.site-footer {
    background-color: var(--color-text);
    color: var(--color-background);
    padding: var(--spacing-xxl) var(--spacing-md) var(--spacing-lg);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.footer-heading {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

.footer-links,
.footer-contact,
.footer-certifications {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-link {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--color-background);
}

.footer-contact li,
.footer-certifications li {
    color: rgba(255, 255, 255, 0.8);
}

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

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

/* === RESPONSIVE: TABLET === */
@media (min-width: 768px) {
    .main-navigation {
        display: block;
        position: static;
        box-shadow: none;
        padding: 0;
        margin-top: 0;
    }
    
    .main-navigation.mobile-menu-open {
        position: static;
        box-shadow: none;
        padding: 0;
        margin-top: 0;
    }
    
    .main-navigation.mobile-menu-open .nav-list {
        flex-direction: row;
        gap: var(--spacing-lg);
        align-items: center;
    }
    
    .main-navigation.mobile-menu-open .nav-link {
        display: inline-block;
        padding: var(--spacing-sm) var(--spacing-md);
        text-align: left;
    }
    
    .mobile-menu-toggle {
        display: none;
    }
    
    .hero-container {
        grid-template-columns: 1fr 1fr;
        text-align: left;
    }
    
    .hero-content {
        text-align: left;
    }
    
    .hero-features {
        justify-content: flex-start;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .form-row {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === RESPONSIVE: DESKTOP === */
@media (min-width: 1024px) {
    .hero-title {
        font-size: 56px;
    }
    
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}