/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Colors */
    --color-primary: #6b121f;
    --color-primary-dark: #4a0d15;
    --color-primary-light: #8b1a2a;
    --color-secondary: #c7ad6d;
    --color-secondary-dark: #a8904f;
    --color-secondary-light: #d4be88;
    --color-white: #ffffff;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #e9ecef;
    --color-gray-200: #dee2e6;
    --color-gray-300: #ced4da;
    --color-gray-500: #6c757d;
    --color-gray-700: #495057;
    --color-gray-900: #212529;
    --color-text: #333333;
    --color-text-light: #555555;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

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

    /* Borders */
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;

    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    line-height: 1.6;
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-gray-900);
    line-height: 1.3;
    font-weight: 700;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

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

p:last-child {
    margin-bottom: 0;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

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

.section-title {
    margin-bottom: var(--spacing-xl);
    position: relative;
    color: var(--color-gray-900);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-secondary);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

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

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    font-size: var(--font-size-md);
    font-weight: 600;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1;
    white-space: nowrap;
}

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

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

.btn-hero {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 1.125rem 2.5rem;
    font-size: var(--font-size-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 6px 20px rgba(107, 18, 31, 0.3);
}

.btn-hero:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(107, 18, 31, 0.4);
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    height: var(--header-height);
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.header-scrolled {
    border-bottom: 1px solid var(--color-gray-100);
    box-shadow: var(--shadow-sm);
    background-color: rgba(255, 255, 255, 0.99);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: var(--spacing-lg);
}

/* ============================================
   LOGO (Header)
   ============================================ */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-gray-900);
    transition: var(--transition);
    flex-shrink: 0;
}

.logo:hover {
    transform: translateY(-1px);
    color: var(--color-gray-900);
}

/* Контейнер для изображения логотипа */
.logo-mark {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 2px solid var(--color-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(107, 18, 31, 0.12);
    transition: var(--transition);
    overflow: hidden;
    flex-shrink: 0;
    position: relative;
}

/* Золотой акцентный уголок при hover */
.logo-mark::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 14px 14px;
    border-color: transparent transparent var(--color-secondary) transparent;
    opacity: 0;
    transition: var(--transition);
}

.logo:hover .logo-mark {
    border-color: var(--color-primary);
    box-shadow: 0 4px 14px rgba(107, 18, 31, 0.2);
    transform: scale(1.03);
}

.logo:hover .logo-mark::after {
    opacity: 1;
}

/* Само изображение логотипа */
.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    padding: 4px;
}

/* Текстовая группа рядом с логотипом */
.logo-text-group {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.logo-tagline {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-top: 3px;
    white-space: nowrap;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

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

.nav-item {
    list-style: none;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: var(--transition);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    margin-left: var(--spacing-xs);
}

.nav-cta .btn {
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-sm);
}

/* ============================================
   BURGER MENU
   ============================================ */
.burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    flex-shrink: 0;
}

.burger-line {
    display: block;
    width: 100%;
    height: 2.5px;
    background-color: var(--color-gray-700);
    border-radius: 2px;
    transition: var(--transition);
    transform-origin: center;
}

.burger-active .burger-line:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.burger-active .burger-line:nth-child(2) {
    opacity: 0;
}

.burger-active .burger-line:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a0a0e 0%, #3d1118 30%, #6b121f 60%, #4a0d15 100%);
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/lab-background.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(180, 50, 60, 0.85) 0%,
        rgba(107, 18, 31, 0.75) 50%,
        rgba(74, 13, 21, 0.85) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-md);
    max-width: 850px;
}

/* ============================================
   HERO BRAND (Logo + Title)
   ============================================ */
.hero-brand {
    margin-bottom: var(--spacing-xl);
}

.hero-brand-mark {
    width: 110px;
    height: 110px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    position: relative;
    border: 3px solid var(--color-secondary);
    overflow: hidden;
    transition: var(--transition);
}

/* Внешнее декоративное кольцо */
.hero-brand-mark::before {
    content: '';
    position: absolute;
    inset: -8px;
    border: 1px solid rgba(199, 173, 109, 0.35);
    border-radius: calc(var(--border-radius-xl) + 6px);
    pointer-events: none;
}

/* Мягкое свечение */
.hero-brand-mark::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.4), transparent 60%);
    pointer-events: none;
}

.hero-brand-mark:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.hero-logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    padding: 10px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-4xl);
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero-brand-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.hero-brand-divider span:first-child,
.hero-brand-divider span:last-child {
    display: block;
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-secondary), transparent);
}

.hero-brand-tagline {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.25em;
    white-space: nowrap;
}

/* ============================================
   HERO TEXT
   ============================================ */
.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.02em;
}

.hero-text {
    font-size: var(--font-size-md);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-image {
    text-align: center;
}

.about-photo {
    width: 100%;
    max-width: 350px;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    aspect-ratio: 3 / 4;
    transition: var(--transition);
}

.about-photo:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

.about-text h2 {
    margin-bottom: var(--spacing-lg);
}

.about-text h2::after {
    margin-left: 0;
}

.about-text p {
    font-size: var(--font-size-md);
    line-height: 1.8;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--color-gray-900);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

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

/* Footer Brand */
.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-brand-mark {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1.5px solid var(--color-secondary);
    border-radius: var(--border-radius);
    flex-shrink: 0;
    overflow: hidden;
    transition: var(--transition);
}

.footer-brand-mark:hover {
    transform: scale(1.05);
    border-color: var(--color-secondary-light);
}

.footer-logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    padding: 3px;
}

.footer-brand-text-group {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.footer-brand-text {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.01em;
}

.footer-brand .footer-brand-tagline {
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 2px;
}

.footer-middle {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) 0;
}

.footer-disclaimer {
    font-size: var(--font-size-sm);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 0;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-copy {
    font-size: var(--font-size-sm);
    margin-bottom: 0;
    color: rgba(255, 255, 255, 0.5);
}

.footer-credits {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 0;
}

.footer-credits a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    font-weight: 500;
}

.footer-credits a:hover {
    color: var(--color-secondary-light);
    text-decoration: underline;
}

/* ============================================
   UTILITIES
   ============================================ */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    z-index: 10000;
    font-size: var(--font-size-sm);
    border-radius: 0 0 var(--border-radius) 0;
}

.skip-link:focus {
    top: 0;
    color: var(--color-white);
}