/* ===================================
   CONFIGURATION & CSS VARIABLES
   Изменяйте эти переменные для кастомизации
   =================================== */
:root {
    /* Colors - Primary Palette */
    --color-primary: #3b5998;
    --color-primary-dark: #2d4373;
    --color-primary-light: #4c70ba;
    
    /* Colors - Neutral Palette */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Colors - Accent */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */
    
    /* Spacing */
    --spacing-xs: 0.5rem;     /* 8px */
    --spacing-sm: 0.75rem;    /* 12px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */
    --spacing-3xl: 4rem;      /* 64px */
    
    /* Border Radius */
    --radius-sm: 0.25rem;     /* 4px */
    --radius-md: 0.5rem;      /* 8px */
    --radius-lg: 0.75rem;     /* 12px */
    --radius-xl: 1rem;        /* 16px */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1rem;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   COOKIE NOTICE (GDPR)
   =================================== */
.cookie-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-gray-900);
    color: var(--color-white);
    padding: var(--spacing-lg);
    z-index: 1000;
    box-shadow: var(--shadow-xl);
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.cookie-notice.is-visible {
    transform: translateY(0);
}

.cookie-notice__content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.cookie-notice__text {
    flex: 1;
    min-width: 200px;
    font-size: var(--font-size-sm);
}

.cookie-notice__button {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: background-color var(--transition-base);
    white-space: nowrap;
}

.cookie-notice__button:hover {
    background-color: var(--color-primary-dark);
}

/* ===================================
   HEADER
   =================================== */
.header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.header__logo {
    display: flex;
    justify-content: center;
}

.header__logo-img {
    height: 40px;
    width: auto;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
    background-color: var(--color-gray-50);
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
}

.hero__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hero__brand {
    margin-bottom: var(--spacing-xl);
}

.hero__brand-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: 0.1em;
}

.hero__brand-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--spacing-xs);
}

.hero__title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   STORIES SECTION (Story Cards)
   =================================== */
.stories {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.stories__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

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

/* Story Card Component */
.story-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
}

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

.story-card__image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background-color: var(--color-gray-200);
}

.story-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.story-card:hover .story-card__image img {
    transform: scale(1.05);
}

.story-card__content {
    padding: var(--spacing-lg);
}

.story-card__category {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.story-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
    line-height: 1.4;
}

/* ===================================
   ANSWER SECTION
   =================================== */
.answer {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.answer__container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.answer__label {
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.answer__text {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
}

.answer__description {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.answer__button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-2xl);
    background-color: var(--color-white);
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.answer__button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* ===================================
   OFFER SECTION (Main Product Offer)
   =================================== */
.offer {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-gray-50);
}

.offer__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.offer__content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.offer__image {
    position: sticky;
    top: 100px;
    position: relative;
}

.offer__book-cover {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.offer__badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background-color: var(--color-warning);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 700;
    transform: rotate(5deg);
    box-shadow: var(--shadow-md);
}

.offer__details {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.offer__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.offer__subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
    line-height: 1.4;
}

.offer__description {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

/* Features List */
.offer__features {
    margin-bottom: var(--spacing-xl);
}

.offer__features-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
}

.offer__features-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-md);
}

.offer__features-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
}

.offer__features-icon {
    width: 24px;
    height: 24px;
    color: var(--color-success);
    flex-shrink: 0;
    margin-top: 2px;
}

/* Chapters Grid */
.offer__chapters {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
}

.offer__chapters-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-lg);
}

.offer__chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.offer__chapter {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    transition: transform var(--transition-base);
}

.offer__chapter:hover {
    transform: translateX(4px);
}

.offer__chapter-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    font-weight: 700;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.offer__chapter-title {
    font-size: var(--font-size-base);
    color: var(--color-gray-800);
    font-weight: 500;
}

/* CTA Section */
.offer__cta {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-lg);
}

.offer__button {
    display: inline-block;
    padding: var(--spacing-lg) var(--spacing-2xl);
    background-color: var(--color-white);
    color: var(--color-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    border-radius: var(--radius-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
}

.offer__button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.offer__guarantee {
    color: var(--color-white);
    font-size: var(--font-size-base);
    line-height: 1.8;
}

/* ===================================
   AUTHOR SECTION
   =================================== */
.author {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.author__container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.author__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-lg);
}

.author__text {
    font-size: var(--font-size-lg);
    color: var(--color-gray-700);
    line-height: 1.7;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Social Media */
.footer__social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-gray-800);
    border-radius: 50%;
    transition: background-color var(--transition-base), transform var(--transition-base);
}

.footer__social-link:hover {
    background-color: var(--color-primary);
    transform: translateY(-2px);
}

.footer__social-icon {
    width: 24px;
    height: 24px;
}

/* Disclaimer */
.footer__disclaimer {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background-color: var(--color-gray-800);
    border-radius: var(--radius-lg);
}

.footer__disclaimer-text {
    font-size: var(--font-size-sm);
    line-height: 1.6;
    text-align: center;
}

/* Legal */
.footer__legal {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-800);
    border-bottom: 1px solid var(--color-gray-800);
}

.footer__legal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer__legal-text {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer__legal-text:last-child {
    margin-bottom: 0;
}

/* Company Info */
.footer__company {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.footer__company-text {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

/* Footer Links */
.footer__links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer__link {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    transition: color var(--transition-base);
}

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

.footer__separator {
    color: var(--color-gray-600);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

/* Tablet */
@media (max-width: 968px) {
    :root {
        --container-padding: 1.5rem;
    }
    
    .offer__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .offer__image {
        position: static;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .hero__title {
        font-size: var(--font-size-3xl);
    }
    
    .answer__text {
        font-size: var(--font-size-2xl);
    }
    
    .offer__title {
        font-size: var(--font-size-2xl);
    }
}

/* Mobile */
@media (max-width: 640px) {
    :root {
        --font-size-4xl: 1.875rem;  /* 30px */
        --font-size-3xl: 1.5rem;    /* 24px */
        --font-size-2xl: 1.25rem;   /* 20px */
    }
    
    .stories__grid {
        grid-template-columns: 1fr;
    }
    
    .cookie-notice__content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero {
        padding: var(--spacing-2xl) 0 var(--spacing-xl);
    }
    
    .answer {
        padding: var(--spacing-2xl) 0;
    }
    
    .offer {
        padding: var(--spacing-2xl) 0;
    }
    
    .offer__details {
        padding: var(--spacing-lg);
    }
    
    .offer__chapters-grid {
        grid-template-columns: 1fr;
    }
    
    .footer__links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .footer__separator {
        display: none;
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}