/*
   styles.css for QA-ROAD - "Тестируем с ИИ"
   Design based on the provided image: Dark, hi-tech road theme.
*/

:root {
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    --font-title-hero: 'Orbitron', sans-serif; /* Or a more specific bold/extended sans-serif */

    --color-background-dark: #121212; /* Very dark grey / Off-black */
    --color-background-elements: #1E1E1E; /* Slightly lighter for cards/elements */
    --color-text-light: #FFFFFF;
    --color-text-medium: #B0B0B0; /* Grey for subtitles, less important text */
    --color-text-dark: #121212;
    
    --color-accent-yellow: #FFD700; /* Yellow from image (road markings, buttons) */
    --color-accent-blue-neon: #00E5FF; /* Neon blue for highlights, glows, road path */

    --border-radius-main: 8px;
    --box-shadow-glow-blue: 0 0 10px var(--color-accent-blue-neon), 0 0 20px var(--color-accent-blue-neon), 0 0 5px var(--color-accent-blue-neon) inset;
    --box-shadow-glow-yellow: 0 0 10px var(--color-accent-yellow), 0 0 15px rgba(255, 215, 0, 0.5);
    
    /* Animation and transition variables */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --animation-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Layout variables */
    --header-height: 70px;
    --mobile-menu-width: 280px;
    --container-max-width: 1200px;
    --grid-gap-mobile: 20px;
    --grid-gap-desktop: 30px;
}

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

*,
*::before,
*::after {
    /* Enable hardware acceleration for better performance */
    transform: translateZ(0);
    backface-visibility: hidden;
}

body {
    font-family: var(--font-secondary);
    background-color: var(--color-background-dark);
    color: var(--color-text-medium);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--color-accent-blue-neon);
    text-decoration: none;
    transition: color var(--transition-normal);
}

a:hover {
    color: var(--color-accent-yellow);
}

.container {
    width: 90%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 15px;
}

img {
    max-width: 100%;
    height: auto;
    /* Improve image performance */
    loading: lazy;
}

ul {
    list-style: none;
}

/* Header */
#main-header {
    background-color: rgba(30, 30, 30, 0.85); /* Semi-transparent dark */
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    /* Performance optimization */
    will-change: transform;
}

#main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 45px;
    width: 45px;
    object-fit: contain;
    margin-right: 10px;
    display: block;
    border-radius: 50%;
    /* Performance optimization for images */
    image-rendering: -webkit-optimize-contrast;
}

.logo-text-header {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--color-text-light);
}

#main-header nav ul {
    display: flex;
}

#main-header nav ul li {
    margin-left: 25px;
}

#main-header nav ul li a {
    color: var(--color-text-medium);
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 0.9rem;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-normal);
}

#main-header nav ul li a:hover,
#main-header nav ul li a.active {
    color: var(--color-accent-yellow);
    border-bottom-color: var(--color-accent-yellow);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-text-light);
    margin: 3px 0;
    transition: all var(--transition-normal);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.main-nav {
    /* Desktop styles - show navigation inline */
    position: static;
    width: auto;
    height: auto;
    background-color: transparent;
    padding: 0;
    transition: none;
    z-index: auto;
    box-shadow: none;
}

.main-nav.active {
    right: 0;
}

#main-header nav ul {
    display: flex;
    flex-direction: row;
    gap: 0;
    justify-content: flex-end;
}

#main-header nav ul li {
    margin-left: 25px;
    width: auto;
    border-bottom: none;
}

#main-header nav ul li:last-child {
    border-bottom: none;
}

#main-header nav ul li a {
    color: var(--color-text-medium);
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 0.9rem;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-normal);
    display: inline-block;
    width: auto;
    text-align: center;
}

#main-header nav ul li a:hover,
#main-header nav ul li a.active {
    color: var(--color-accent-yellow);
    border-bottom-color: var(--color-accent-yellow);
    background-color: transparent;
    padding-left: 0;
}

/* Hero Section */
.hero-section {
    padding: 40px 0 60px;
    text-align: center;
    background-color: var(--color-background-dark); /* Could add subtle road texture later */
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-main-title {
    font-family: var(--font-title-hero); /* Needs a very bold, impactful font */
    font-size: 4rem; /* Adjust as needed */
    color: var(--color-text-light);
    text-transform: uppercase;
    margin-bottom: 10px;
    letter-spacing: 2px;
    text-shadow: 0 0 15px var(--color-accent-blue-neon), 0 0 5px var(--color-accent-blue-neon);
}

.hero-subtitle {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    color: var(--color-text-medium);
    margin-bottom: 40px;
    font-weight: 500;
}

.hero-road-visual {
    width: 100%;
    max-width: 250px;
    height: 200px;
    background-image: url('../images/ai_road_visual.jpg');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center center;
    margin: 0 auto 40px auto;
    border-radius: var(--border-radius-main);
    color: var(--color-text-medium);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-family: var(--font-primary);
    font-weight: 700;
    border-radius: var(--border-radius-main);
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
    /* Performance optimization */
    will-change: transform, box-shadow;
    text-align: center;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-cta-hero {
    background-color: var(--color-accent-yellow);
    color: var(--color-text-dark);
    border-color: var(--color-accent-yellow);
    font-size: 1rem;
    box-shadow: var(--box-shadow-glow-yellow);
    /* Центрирование кнопки */
    display: block;
    margin: 0 auto;
    width: 85%;
    max-width: 250px;
    min-width: 180px;
    text-align: center;
}

.btn-cta-hero:hover {
    background-color: var(--color-text-dark);
    color: var(--color-accent-yellow);
    border-color: var(--color-accent-yellow);
    box-shadow: 0 0 15px var(--color-accent-yellow);
}

/* What Inside Section */
.what-inside-section {
    padding: 70px 0;
    background-color: var(--color-background-elements);
}

.section-title-yellow-bg {
    font-family: var(--font-primary);
    font-size: 2.2rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.feature-card {
    background-color: var(--color-background-dark);
    padding: 18px 15px;
    border-radius: var(--border-radius-main);
    text-align: center;
    border: 1px solid var(--color-accent-blue-neon);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    /* Performance optimization */
    will-change: transform;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 229, 255, 0.3);
}

.feature-icon {
    font-size: 3rem;
    color: var(--color-accent-yellow);
    font-weight: bold;
    text-align: center;
    margin-bottom: 12px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    padding: 5px 0;
}

.feature-card h3 {
    font-family: var(--font-primary);
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
    font-weight: 700;
}

.feature-card p {
    font-size: 0.85rem;
    color: var(--color-text-medium);
    line-height: 1.5;
}

/* Course Program Section */
.course-program-section {
    padding: 70px 0;
    background-color: var(--color-background-dark);
}

.course-program-section h2 {
    font-family: var(--font-primary);
    font-size: 2.2rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.course-program-section p {
    margin-bottom: 20px;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.course-program-section ul {
    max-width: 800px;
    margin: 0 auto 30px auto;
    padding-left: 20px; /* For list bullets if used */
}

.course-program-section ul li {
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.course-program-section ul li::before {
    content: '\27A2'; /* Neon blue arrow or similar */
    color: var(--color-accent-blue-neon);
    position: absolute;
    left: 0;
    font-size: 1.2em;
    line-height: 1;
}

.course-program-section h3 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    color: var(--color-accent-yellow);
    text-align: center;
    margin-top: 40px;
    margin-bottom: 15px;
}

/* Testimonials Section */
.testimonials-section {
    padding: 70px 0;
    background-color: var(--color-background-elements);
}

.testimonials-section h2 {
    font-family: var(--font-primary);
    font-size: 2.2rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.testimonials-intro {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.1rem;
    color: var(--color-text-medium);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
    /* Удаляем минимальную высоту, которая создавала пустое пространство */
    /* min-height: 200px; */
    height: auto;
}

.testimonial-card {
    background-color: var(--color-background-dark);
    border-radius: var(--border-radius-main);
    overflow: hidden;
    border: 1px solid var(--color-accent-blue-neon);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    will-change: transform;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 229, 255, 0.3);
}

/* Простые скриншоты отзывов */
.testimonial-screenshot {
    width: 100%;
    height: auto;
    /* Удаляем минимальную высоту для изображений, пусть они сами определяют свою высоту */
    /* min-height: 200px; */
    border-radius: var(--border-radius-main);
    border: 1px solid var(--color-accent-blue-neon);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
    display: block; /* Гарантируем блочное отображение */
    background-color: var(--color-background-dark); /* Добавляем фон, чтобы изображение было видно */
    object-fit: contain; /* Сохраняем пропорции изображения */
    margin-bottom: 0; /* Убираем отступ снизу */
}



/* Добавляем стили для контейнера изображений */
.testimonials-grid img {
    max-width: 100%;
    object-position: top; /* Выравнивание по верхнему краю */
    vertical-align: top; /* Убираем лишний отступ снизу */
}



/* Placeholder для незагруженных изображений */
.testimonial-placeholder {
    width: 100%;
    min-height: 200px;
    border-radius: var(--border-radius-main);
    border: 2px dashed var(--color-accent-yellow);
    background-color: rgba(255, 215, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    text-align: center;
}

.placeholder-content h3 {
    color: var(--color-accent-yellow);
    font-family: var(--font-primary);
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.placeholder-content p {
    color: var(--color-text-medium);
    margin-bottom: 8px;
}

.placeholder-content small {
    color: var(--color-text-medium);
    font-size: 0.8rem;
    opacity: 0.7;
}

.payment-methods-detailed {
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid rgba(0, 229, 255, 0.3);
    text-align: center;
}

.payment-methods-detailed.no-border {
    border-top: none;
    padding-top: 0;
}

.payment-methods-detailed h3 {
    font-family: var(--font-primary);
    font-size: 1.4rem;
    color: var(--color-accent-yellow);
    margin-bottom: 15px;
}

.payment-methods-detailed p {
    font-size: 0.95rem;
    color: var(--color-text-medium);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Enroll Section */
.enroll-section {
    padding: 70px 0;
    background-color: var(--color-background-elements);
    text-align: center;
}

.enroll-section h2 {
    font-family: var(--font-title-hero);
    font-size: 2.5rem;
    color: var(--color-text-light);
    margin-bottom: 30px;
    text-shadow: var(--box-shadow-glow-blue);
}

.price-info {
    margin-bottom: 30px;
}

.original-price {
    font-size: 1.1rem;
    color: var(--color-text-medium);
    text-decoration: line-through;
}

.discount-offer {
    margin-top: 5px;
}

.discount-offer p {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.discount-offer strong {
    color: var(--color-accent-yellow);
}

.discounted-price {
    font-family: var(--font-primary);
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--color-text-light);
    margin-top: 5px;
    display: block;
}

/* Styles for spacing requested by user */
.moved-discount > p:first-child {
    margin-bottom: 1rem; /* Space after "Подпишитесь на Telegram-канал..." */
}

.moved-discount {
    margin-top: 1rem; /* Space after the enroll button */
    margin-bottom: 1rem; /* Space after "Цена со скидкой..." block, before payment info */
}

.btn-enroll-main {
    background-color: var(--color-accent-yellow);
    color: var(--color-text-dark);
    border-color: var(--color-accent-yellow);
    font-size: 1rem;
    padding: 30px 25px;
    box-shadow: var(--box-shadow-glow-yellow);
    width: 85%;
    max-width: 350px;
    margin: 0 auto;
    display: block;
    line-height: 1.3;
    text-align: center;
}

.btn-enroll-main:hover {
    background-color: var(--color-text-dark);
    color: var(--color-accent-yellow);
    border-color: var(--color-accent-yellow);
    box-shadow: 0 0 15px var(--color-accent-yellow);
}

.btn-enroll-discount {
    background-color: var(--color-accent-blue-neon);
    color: var(--color-text-dark);
    border-color: var(--color-accent-blue-neon);
    font-size: 1rem;
    padding: 30px 25px;
    box-shadow: var(--box-shadow-glow-blue);
    width: 85%;
    max-width: 350px;
    margin: 0 auto;
    display: block;
    line-height: 1.3;
    text-align: center;
}

.btn-enroll-discount:hover {
    background-color: var(--color-text-dark);
    color: var(--color-accent-blue-neon);
    border-color: var(--color-accent-blue-neon);
    box-shadow: 0 0 15px var(--color-accent-blue-neon);
}

/* Стиль для текста между кнопками */
.between-buttons {
    margin: 30px 0;
    padding: 15px;
    border-radius: var(--border-radius-main);
    background-color: rgba(0, 229, 255, 0.1);
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
}

.between-buttons p {
    margin-bottom: 5px;
    line-height: 1.4;
}

.between-buttons p:last-child {
    margin-bottom: 0;
}

.robokassa-logo-placeholder {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--color-text-medium);
}

.payment-methods-info {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--color-text-medium);
    display: flex; /* Align text and logo */
    align-items: center; /* Vertically align items */
    justify-content: center; /* Center items if they wrap or on smaller screens */
    flex-wrap: wrap; /* Allow wrapping if space is tight */
}

.robokassa-logo {
    height: 30px; /* Adjust as needed */
    width: auto;
    margin-left: 10px; /* Space between text and logo */
    vertical-align: middle; /* Better alignment if not using flex */
}

/* Author Section */
.author-section {
    padding: 70px 0;
    background-color: var(--color-background-dark);
}

.author-section h2 {
    font-family: var(--font-primary);
    font-size: 2rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 40px;
    text-transform: uppercase;
}

.author-content {
    display: flex;
    flex-direction: column; /* Stack on small screens */
    align-items: center;
    gap: 30px;
}

.author-photo-container {
    flex-shrink: 0;
}

.author-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-accent-blue-neon);
    box-shadow: var(--box-shadow-glow-blue);
}

.author-bio {
    max-width: 700px;
    text-align: center; /* Center text on small screens */
}

.author-bio .author-intro-image {
    font-family: var(--font-primary);
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin-bottom: 15px;
}

.author-bio p {
    margin-bottom: 15px;
    font-size: 1rem;
}

.author-social-links {
    margin-top: 20px;
}

.author-social-links p {
    font-weight: 500;
    color: var(--color-text-light);
    margin-bottom: 10px;
}

.social-link {
    display: inline-block;
    margin: 5px 10px 5px 0;
    color: var(--color-accent-yellow);
    border: 1px solid var(--color-accent-yellow);
    padding: 8px 15px;
    border-radius: var(--border-radius-main);
    font-size: 0.9rem;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background-color: var(--color-accent-yellow);
    color: var(--color-text-dark);
    transform: translateY(-2px);
}

/* Footer */
#main-footer {
    background-color: #0A0A0A; /* Even darker for footer */
    color: var(--color-text-medium);
    padding: 40px 0 20px;
    text-align: center;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer-logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-logo-img {
    height: 30px;
    width: auto;
    object-fit: contain;
    display: block;
}

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

.footer-links a {
    color: var(--color-text-medium);
    margin: 0 10px;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--color-accent-yellow);
}

.footer-tagline p {
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-legal {
    margin-top: 15px;
    border-top: 1px solid var(--color-background-elements);
    padding-top: 20px;
    width: 100%;
}

.footer-legal p {
    font-size: 0.85rem;
    margin-bottom: 5px;
}

.footer-legal a {
    color: var(--color-text-medium);
}
.footer-legal a:hover {
    color: var(--color-accent-yellow);
}

/* Responsive Adjustments */
/* Desktop styles for enrollment buttons */
@media (min-width: 768px) {
    .btn-enroll-main,
    .btn-enroll-discount {
        max-width: 400px;
        width: auto;
        min-width: 350px;
        padding: 30px 30px;
    }
    
    .mobile-only {
        display: none !important;
    }
}

/* Tablet styles */
@media (min-width: 768px) and (max-width: 1024px) {
    .container {
        width: 95%;
        padding: 0 10px;
    }
    
    .hero-main-title {
        font-size: 3.2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    .author-content {
        flex-direction: row;
        text-align: left;
    }
    
    .author-bio {
        text-align: left;
    }
    
    /* Testimonials section tablet */
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    /* Простые скриншоты отзывов на планшете */
}

/* Mobile landscape and small tablets */
@media (max-width: 767px) {
    .container {
        width: 95%;
        padding: 0 10px;
    }
    
    /* Модальное окно на мобильных */
    .modal-content {
        padding: 10px;
        width: 95%;
        max-height: 85vh;
        position: fixed;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }
    
    .modal-content img {
        max-height: 80vh;
        border-width: 1px;
    }
    
    .close {
        position: fixed;
        top: 10px;
        right: 10px;
        font-size: 30px;
        width: 45px;
        height: 45px;
        background: rgba(0, 0, 0, 0.8);
    }
    
    /* Header mobile adjustments */
    #main-header {
        padding: 10px 0;
    }
    
    #main-header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: var(--mobile-menu-width);
        height: 100vh;
        background-color: var(--color-background-elements);
        padding: 80px 20px 20px;
        transition: right var(--transition-normal);
        z-index: 1000;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
        will-change: right;
    }
    
    .main-nav.active {
        right: 0;
    }
    
    #main-header nav ul {
        flex-direction: column;
        gap: 0;
        justify-content: flex-start;
    }
    
    #main-header nav ul li {
        margin-left: 0;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        transition: background-color var(--transition-fast);
    }
    
    #main-header nav ul li:last-child {
        border-bottom: none;
    }
    
    #main-header nav ul li a {
        font-size: 1rem;
        padding: 15px 0;
        border-radius: 0;
        background-color: transparent;
        display: block;
        width: 100%;
        text-align: left;
        border-bottom: none;
        color: var(--color-text-light);
        transition: all var(--transition-fast);
    }
    
    #main-header nav ul li a:hover {
        color: var(--color-accent-yellow);
        background-color: rgba(255, 215, 0, 0.1);
        padding-left: 10px;
    }
    
    /* Hero section mobile */
    .hero-section {
        padding: 30px 0 40px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-main-title {
        font-size: 2.8rem;
        margin-bottom: 15px;
        line-height: 1.1;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 30px;
        padding: 0 10px;
    }
    
    .hero-road-visual {
        height: 125px;
        margin-bottom: 30px;
        max-width: 175px;
    }
    
    .btn-cta-hero {
        font-size: 1rem;
        padding: 15px 25px;
        width: 85%;
        max-width: 280px;
        min-width: 200px;
        margin: 0 auto;
        display: block;
    }
    
    /* Features section mobile */
    .what-inside-section {
        padding: 50px 0;
    }
    
    .section-title-yellow-bg {
        font-size: 1.8rem;
        margin-bottom: 25px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .feature-card {
        padding: 18px 15px;
        margin: 0 5px;
    }
    
    .feature-icon {
        font-size: 3rem;
        margin-bottom: 12px;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
        margin-bottom: 8px;
    }
    
    .feature-card p {
        font-size: 0.85rem;
        line-height: 1.5;
    }
    
    /* Course program section mobile */
    .course-program-section {
        padding: 50px 0;
    }
    
    .course-program-section h2, 
    .enroll-section h2, 
    .author-section h2 {
        font-size: 1.8rem;
        margin-bottom: 25px;
    }
    
    .course-program-section p {
        font-size: 0.95rem;
        margin-bottom: 25px;
        padding: 0 10px;
    }
    
    .course-program-section ul {
        padding-left: 15px;
        margin: 0 10px 30px 10px;
    }
    
    .course-program-section ul li {
        margin-bottom: 15px;
        padding-left: 20px;
        font-size: 0.9rem;
        line-height: 1.6;
    }
    
    .course-program-section h3 {
        font-size: 1.3rem;
        margin-top: 35px;
        margin-bottom: 20px;
    }
    
    /* Testimonials section mobile */
    .testimonials-section {
        padding: 50px 0;
    }
    
    .testimonials-section h2 {
        font-size: 1.8rem;
        margin-bottom: 25px;
        padding: 0 10px;
    }
    
    .testimonials-intro {
        font-size: 1rem;
        margin-bottom: 30px;
        padding: 0 15px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 30px;
        /* Убираем минимальную высоту, если она была задана */
        min-height: auto;
        height: auto;
    }
    
    /* Mobile testimonial screenshots */
    .testimonial-screenshot {
        /* Устанавливаем автоматическую высоту для мобильных устройств */
        height: auto;
        min-height: auto;
        /* Сохраняем корректные пропорции */
        object-fit: cover;
        /* Нет лишних отступов */
        margin-bottom: 0;
    }
    
    .payment-methods-detailed {
        margin-top: 25px;
        padding-top: 20px;
    }
    
    .payment-methods-detailed h3 {
        font-size: 1.2rem;
        margin-bottom: 12px;
        padding: 0 15px;
    }
    
    .payment-methods-detailed p {
        font-size: 0.9rem;
        padding: 0 15px;
        line-height: 1.5;
    }
    
    /* Enroll section mobile */
    .enroll-section {
        padding: 50px 0;
    }
    
    .enroll-section h2 {
        font-size: 2rem;
        margin-bottom: 25px;
        padding: 0 10px;
    }
    
    .discounted-price {
        font-size: 2.2rem;
        margin: 15px 0;
    }
    
    .between-buttons {
        margin: 25px auto;
        padding: 15px;
        width: 90%;
        max-width: 400px;
    }
    
    .payment-methods-info {
        flex-direction: column;
        gap: 10px;
        padding: 0 20px;
        font-size: 0.85rem;
    }
    
    .robokassa-logo {
        margin-left: 0;
        height: 25px;
    }
    
    /* Author section mobile */
    .author-section {
        padding: 50px 0;
    }
    
    .author-content {
        flex-direction: column;
        text-align: center;
        gap: 25px;
    }
    
    .author-photo {
        width: 150px;
        height: 150px;
        border-width: 3px;
    }
    
    .author-bio {
        text-align: center;
        padding: 0 10px;
    }
    
    .author-bio .author-intro-image {
        font-size: 1.1rem;
        margin-bottom: 15px;
    }
    
    .author-bio p {
        font-size: 0.95rem;
        margin-bottom: 15px;
        line-height: 1.6;
    }
    
    .social-link {
        display: block;
        margin: 8px auto;
        width: 90%;
        max-width: 250px;
        text-align: center;
        padding: 12px 15px;
        font-size: 0.9rem;
    }
    
    /* Footer mobile */
    #main-footer {
        padding: 30px 0 15px;
    }
    
    .footer-container {
        gap: 15px;
    }
    
    .footer-tagline p {
        font-size: 0.95rem;
        padding: 0 20px;
        line-height: 1.4;
    }
    
    .footer-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    .footer-links a {
        font-size: 0.85rem;
        margin: 0;
    }
    
    .footer-legal {
        padding: 15px 20px 0;
    }
    
    .footer-legal p {
        font-size: 0.8rem;
        margin-bottom: 8px;
        line-height: 1.4;
    }
}

/* Mobile portrait */
@media (max-width: 480px) {
    .container {
        width: 98%;
        padding: 0 5px;
    }
    
    /* Модальное окно на маленьких экранах */
    .modal-content {
        padding: 5px;
        width: 98%;
        max-height: 90vh;
        position: fixed;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }
    
    .modal-content img {
        max-height: 75vh;
        border-radius: 4px;
    }
    
    .close {
        position: fixed;
        top: 5px;
        right: 5px;
        font-size: 25px;
        width: 40px;
        height: 40px;
        background: rgba(0, 0, 0, 0.9);
    }
    
    /* Header extra small mobile */
    #main-header nav ul {
        gap: 6px 8px;
    }
    
    #main-header nav ul li a {
        font-size: 0.8rem;
        padding: 6px 10px;
    }
    
    .logo-img {
        height: 35px;
        width: 35px;
    }
    
     .logo-text-header {
        font-size: 1.3rem;
    }
    
    /* Hero section extra small mobile */
    .hero-main-title {
        font-size: 2.2rem;
        margin-bottom: 12px;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 25px;
        padding: 0 15px;
    }
    
    .hero-road-visual {
        height: 100px;
        margin-bottom: 25px;
        max-width: 150px;
    }
    
    .btn-cta-hero {
        font-size: 1rem;
        padding: 12px 20px;
        width: 85%;
        max-width: 250px;
        min-width: 180px;
        margin: 0 auto;
        display: block;
        text-align: center;
    }
    
    /* Features section extra small mobile */
    .section-title-yellow-bg {
        font-size: 1.6rem;
        padding: 0 15px;
    }
    
    .feature-card {
        padding: 18px 15px;
        margin: 0;
    }
    
    .feature-icon {
        font-size: 3rem;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
        margin-bottom: 8px;
    }
    
    .feature-card p {
        font-size: 0.85rem;
        line-height: 1.5;
    }
    
    /* Course program extra small mobile */
    .course-program-section h2,
    .enroll-section h2,
    .author-section h2 {
        font-size: 1.6rem;
        padding: 0 15px;
    }
    
    .course-program-section p {
        font-size: 0.9rem;
        padding: 0 15px;
    }
    
    .course-program-section ul {
        margin: 0 15px 25px 15px;
    }
    
    .course-program-section ul li {
        font-size: 0.85rem;
        padding-left: 18px;
    }
    
    /* Testimonials section extra small mobile */
    .testimonials-section h2 {
        font-size: 1.6rem;
        padding: 0 15px;
    }
    
    .testimonials-intro {
        font-size: 0.95rem;
        padding: 0 20px;
    }
    
    .testimonials-grid {
        gap: 15px;
        /* Убираем ограничения для очень маленьких экранов */
        height: auto;
        min-height: auto;
    }
    
    /* Уменьшаем отступы для маленьких экранов */
    @media (max-width: 480px) {
        .testimonials-grid {
            gap: 10px;
            margin-top: 20px;
        }
        
        .testimonial-screenshot {
            border-width: 1px;
        }
    }
    
    .payment-methods-detailed {
        margin-top: 20px;
        padding-top: 15px;
    }
    
    .payment-methods-detailed h3 {
        font-size: 1.1rem;
        margin-bottom: 10px;
        padding: 0 20px;
    }
    
    .payment-methods-detailed p {
        font-size: 0.85rem;
        padding: 0 20px;
        line-height: 1.4;
    }
    
    /* Enroll section extra small mobile */
    .enroll-section h2 {
        font-size: 1.8rem;
        padding: 0 15px;
    }
    
    .discounted-price {
        font-size: 2rem;
    }
    
    .btn-enroll-main,
    .btn-enroll-discount {
        font-size: 1rem;
        padding: 30px 25px;
        width: 85%;
        max-width: 280px;
    }
    
    .between-buttons {
        width: 95%;
        padding: 12px;
        margin: 20px auto;
    }
    
    .between-buttons p {
        font-size: 0.9rem;
    }
    
    /* Author section extra small mobile */
    .author-photo {
        width: 120px;
        height: 120px;
    }
    
    .author-bio {
        padding: 0 15px;
    }
    
    .author-bio .author-intro-image {
        font-size: 1rem;
    }
    
    .author-bio p {
        font-size: 0.9rem;
    }
    
    .social-link {
        width: 95%;
        max-width: 220px;
        padding: 10px 12px;
        font-size: 0.85rem;
    }
    
    /* Footer extra small mobile */
    .footer-tagline p {
        font-size: 0.85rem;
        padding: 0 15px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .footer-legal {
        padding: 12px 15px 0;
    }
    
    .footer-legal p {
        font-size: 0.75rem;
    }
}

/* Extra wide mobile landscape */
@media (max-width: 667px) and (orientation: landscape) {
    .hero-main-title {
        font-size: 2.5rem;
    }
    
    .hero-section {
        padding: 25px 0 35px;
    }
    
    .hero-road-visual {
        height: 140px;
    }
    
    .what-inside-section,
    .course-program-section,
    .enroll-section,
    .author-section {
        padding: 40px 0;
    }
}

/* Touch device optimizations */
@media (pointer: coarse) {
    .btn,
    .social-link,
    #main-header nav ul li a {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .social-link {
        min-height: 48px;
    }
    
    a[href^="#"] {
        scroll-margin-top: 80px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hero-road-visual {
        background-size: cover;
    }
}

/* Dark mode support for devices that prefer it */
@media (prefers-color-scheme: dark) {
    /* Styles are already dark, but we can enhance contrast if needed */
    :root {
        --color-text-medium: #C0C0C0;
    }
}

/* Large Desktop Styles */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
    
    .hero-main-title {
        font-size: 5rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .hero-road-visual {
        max-width: 300px;
        height: 225px;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 40px;
    }
    
    .feature-card {
        padding: 40px 30px;
    }
    
    .feature-icon {
        font-size: 6rem;
    }
    
    .course-program-section h2,
    .enroll-section h2,
    .author-section h2,
    .testimonials-section h2 {
        font-size: 2.8rem;
    }
    
    .testimonials-grid {
        gap: 40px;
    }
    
    .author-photo {
        width: 250px;
        height: 250px;
    }
    
    .btn-enroll-main,
    .btn-enroll-discount {
        max-width: 450px;
        min-width: 400px;
        padding: 36px 35px;
        font-size: 1.1rem;
    }
}

/* Ultra-wide screens */
@media (min-width: 1920px) {
    .container {
        max-width: 1600px;
    }
    
    .hero-main-title {
        font-size: 6rem;
    }
    
    .hero-road-visual {
        max-width: 350px;
        height: 250px;
    }
    
    .features-grid {
        gap: 50px;
    }
    
    .feature-card {
        padding: 50px 40px;
    }
}

/* Print styles */
@media print {
    .mobile-menu-toggle,
    #main-header nav,
    .btn,
    .social-link {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .hero-section,
    .what-inside-section,
    .course-program-section,
    .enroll-section,
    .author-section {
        padding: 20px 0 !important;
        background: white !important;
    }
    
    .hero-main-title,
    .section-title-yellow-bg,
    .course-program-section h2,
    .enroll-section h2,
    .author-section h2 {
        color: black !important;
        text-shadow: none !important;
    }
    
    .feature-card {
        border: 1px solid #ccc !important;
        box-shadow: none !important;
        background: white !important;
    }
    
    .hero-road-visual {
        display: none;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero-main-title {
        text-shadow: none;
    }
    
    .error-code {
        text-shadow: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --color-background-dark: #000000;
        --color-background-elements: #1a1a1a;
        --color-text-light: #ffffff;
        --color-text-medium: #e0e0e0;
        --color-accent-yellow: #ffff00;
        --color-accent-blue-neon: #00ffff;
    }
    
    .feature-card,
    .requisites {
        border-width: 2px;
    }
    
    .btn {
        border-width: 3px;
    }
}

/* Generic Content Page Styles (for Terms, Privacy Policy, etc.) */
.generic-content-section {
    padding: 60px 0;
    background-color: var(--color-background-dark); /* Or var(--color-background-elements) if preferred */
}

.generic-content-section .page-title {
    font-family: var(--font-title-hero);
    font-size: 2.8rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 40px;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 0 10px var(--color-accent-blue-neon);
}

.generic-content-section h2 {
    font-family: var(--font-primary);
    font-size: 1.8rem;
    color: var(--color-accent-yellow);
    margin-top: 30px;
    margin-bottom: 15px;
}

.generic-content-section h3 {
    font-family: var(--font-primary);
    font-size: 1.4rem;
    color: var(--color-text-light);
    margin-top: 25px;
    margin-bottom: 10px;
}

.generic-content-section p,
.generic-content-section li {
    font-size: 1rem;
    color: var(--color-text-medium);
    margin-bottom: 15px;
    line-height: 1.8;
}

.generic-content-section ul, .generic-content-section ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

.generic-content-section ul li::before {
    content: '\27A2'; /* Neon blue arrow or similar, consistent with course program */
    color: var(--color-accent-blue-neon);
    position: absolute;
    left: 0; /* Adjust if .container padding affects this */
    font-size: 1.1em;
    line-height: 1.6; /* Adjust for alignment */
}

.generic-content-section ul li {
    padding-left: 25px; /* Space for the custom bullet */
    position: relative;
}

/* Requisites styling for public offer */
.requisites {
    background-color: var(--color-background-elements);
    border: 1px solid var(--color-accent-blue-neon);
    border-radius: var(--border-radius-main);
    padding: 20px;
    margin-top: 30px;
}

.requisites p {
    margin-bottom: 10px;
}

.requisites strong {
    color: var(--color-text-light);
}

/* Error Pages Styles */
.error {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-background-dark);
}

.error-container {
    text-align: center;
    padding: 100px 20px;
    max-width: 600px;
    margin: 0 auto;
}

.error-code {
    font-family: var(--font-title-hero);
    font-size: 120px;
    font-weight: 700;
    color: var(--color-accent-blue-neon);
    margin-bottom: 20px;
    line-height: 1;
    text-shadow: 0 0 20px var(--color-accent-blue-neon);
}

.error-message {
    font-family: var(--font-primary);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: 30px;
    text-transform: uppercase;
}

.error-description {
    font-size: 16px;
    margin-bottom: 30px;
    color: var(--color-text-medium);
    line-height: 1.6;
}

/* Responsive Adjustments */
@media (min-width: 768px) {
    .author-content {
        flex-direction: row; /* Side-by-side on larger screens */
        text-align: left;
    }
    .author-bio {
        text-align: left;
    }
}

/* Generic content pages mobile */
.generic-content-section {
    padding: 40px 0;
}

.generic-content-section .page-title {
    font-size: 2rem;
    margin-bottom: 30px;
    padding: 0 10px;
    line-height: 1.2;
}

.generic-content-section h2 {
    font-size: 1.5rem;
    margin-top: 25px;
    margin-bottom: 12px;
    padding: 0 5px;
}

.generic-content-section h3 {
    font-size: 1.2rem;
    margin-top: 20px;
    margin-bottom: 8px;
    padding: 0 5px;
}

.generic-content-section p,
.generic-content-section li {
    font-size: 0.9rem;
    margin-bottom: 12px;
    line-height: 1.6;
    padding: 0 5px;
}

.generic-content-section ul,
.generic-content-section ol {
    margin-left: 15px;
    margin-bottom: 15px;
    padding-right: 5px;
}

.generic-content-section ul li {
    padding-left: 20px;
}

.requisites {
    margin: 25px 5px 20px 5px;
    padding: 15px;
}

/* Generic content pages extra small mobile */
.generic-content-section .page-title {
    font-size: 1.7rem;
    padding: 0 15px;
}

.generic-content-section h2 {
    font-size: 1.3rem;
    padding: 0 10px;
}

.generic-content-section h3 {
    font-size: 1.1rem;
    padding: 0 10px;
}

.generic-content-section p,
.generic-content-section li {
    font-size: 0.85rem;
    padding: 0 10px;
}

.generic-content-section ul,
.generic-content-section ol {
    margin-left: 10px;
    padding-right: 10px;
}

.generic-content-section ul li {
    padding-left: 18px;
}

.requisites {
    margin: 20px 15px;
    padding: 12px;
}

/* Error pages mobile */
.error-container {
    padding: 60px 15px;
}

.error-code {
    font-size: 80px;
}

.error-message {
    font-size: 20px;
    margin-bottom: 25px;
}

.error-description {
    font-size: 14px;
    margin-bottom: 25px;
    padding: 0 10px;
}

/* Error pages extra small mobile */
.error-container {
    padding: 40px 10px;
}

.error-code {
    font-size: 60px;
}

.error-message {
    font-size: 18px;
    margin-bottom: 20px;
}

.error-description {
    font-size: 13px;
    margin-bottom: 20px;
    padding: 0 15px;
}

/* Accessibility and Focus Styles */
/* Focus states for better keyboard navigation */
.btn:focus,
.social-link:focus,
#main-header nav ul li a:focus,
.mobile-menu-toggle:focus {
    outline: 2px solid var(--color-accent-yellow);
    outline-offset: 2px;
    background-color: rgba(255, 215, 0, 0.1);
}

/* Remove any default browser outlines and borders that might create white separators */
* {
    outline: none;
}

*:focus {
    outline: none;
}

/* Ensure no white borders or separators in header */
#main-header,
#main-header *,
.main-nav,
.main-nav *,
.logo-container,
.logo-container * {
    border: none !important;
    outline: none !important;
}



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

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
    cursor: wait;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-accent-blue-neon);
    border-radius: 50%;
    border-right-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Selection styles */
::selection {
    background-color: var(--color-accent-yellow);
    color: var(--color-text-dark);
}

::-moz-selection {
    background-color: var(--color-accent-yellow);
    color: var(--color-text-dark);
}

/* Utility Classes for Responsive Design */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { display: block !important; }

.mobile-only {
    display: none;
}

.desktop-only {
    display: block;
}

.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }

.p-10 { padding: 10px; }
.p-20 { padding: 20px; }
.p-30 { padding: 30px; }

.flex { display: flex; }
.flex-column { flex-direction: column; }
.flex-center { justify-content: center; align-items: center; }
.flex-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }

.w-100 { width: 100%; }
.w-50 { width: 50%; }
.h-100 { height: 100%; }

.overflow-hidden { overflow: hidden; }
.position-relative { position: relative; }
.position-absolute { position: absolute; }

/* Responsive typography */
.text-responsive {
    font-size: clamp(0.9rem, 2.5vw, 1.2rem);
}

.title-responsive {
    font-size: clamp(1.5rem, 5vw, 3rem);
}

.subtitle-responsive {
    font-size: clamp(1rem, 3vw, 1.5rem);
}

/* =========================== */
/* RESPONSIVE UTILITY CLASSES */
/* =========================== */

/* Mobile-specific utility classes */
@media (max-width: 767px) {
    .mobile-only {
        display: inline !important;
    }
    
    .desktop-only {
        display: none !important;
    }
    
    /* Дополнительные стили для кнопок с переносом строк */
    .btn-enroll-main,
    .btn-enroll-discount {
        font-size: 1rem;
        padding: 30px 25px;
        width: 85%;
        max-width: 280px;
        margin: 0 auto;
        display: block;
        line-height: 1.3;
    }
    
    .text-center-mobile {
        text-align: center !important;
    }
    
    .text-left-mobile {
        text-align: left !important;
    }
    
    .flex-column-mobile {
        flex-direction: column !important;
    }
    
    .w-100-mobile {
        width: 100% !important;
    }
    
    .w-50-mobile {
        width: 50% !important;
    }
    
    .p-10-mobile {
        padding: 10px !important;
    }
    
    .p-20-mobile {
        padding: 20px !important;
    }
    
    .mb-10-mobile {
        margin-bottom: 10px !important;
    }
    
    .mb-20-mobile {
        margin-bottom: 20px !important;
    }
    
    .mb-30-mobile {
        margin-bottom: 30px !important;
    }
    
    .hidden-mobile {
        display: none !important;
    }
    
    .visible-mobile {
        display: block !important;
    }
    
    /* Mobile navigation improvements */
    .mobile-menu-toggle {
        display: flex !important;
    }
    
    /* Mobile grid improvements */
    .grid-mobile-1 {
        grid-template-columns: 1fr !important;
    }
    
    .gap-mobile-20 {
        gap: 20px !important;
    }
}

/* Desktop-specific utility classes */
@media (min-width: 768px) {
    .mobile-only {
        display: none !important;
    }
    
    .desktop-only {
        display: block !important;
    }
    
    .hidden-desktop {
        display: none !important;
    }
    
    .visible-desktop {
        display: block !important;
    }
    
    .mobile-menu-toggle {
        display: none !important;
    }
    
    /* Ensure mobile navigation styles don't affect desktop */
    .main-nav::before {
        display: none !important;
    }
    
    .main-nav::after {
        display: none !important;
    }
}

/* =========================== */
/* CONTAINER SYSTEM */
/* =========================== */

/* Bootstrap-like container system */
@media (min-width: 576px) {
    .container-sm {
        max-width: 540px;
        margin: 0 auto;
        padding: 0 15px;
    }
}

@media (min-width: 768px) {
    .container-md {
        max-width: 720px;
        margin: 0 auto;
        padding: 0 15px;
    }
}

@media (min-width: 992px) {
    .container-lg {
        max-width: 960px;
        margin: 0 auto;
        padding: 0 15px;
    }
}

@media (min-width: 1200px) {
    .container-xl {
        max-width: 1140px;
        margin: 0 auto;
        padding: 0 15px;
    }
}

/* =========================== */
/* PERFORMANCE OPTIMIZATIONS */
/* =========================== */

/* Smooth animations only for users who prefer them */
@media (prefers-reduced-motion: no-preference) {
    .animate-on-scroll {
        opacity: 0;
        transform: translateY(30px);
        transition: all 0.6s ease-out;
    }
    
    .animate-on-scroll.visible {
        opacity: 1;
        transform: translateY(0);
    }
    
    /* Enhanced hover effects */
    .btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }
    
    .feature-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(0, 229, 255, 0.3);
    }
    
    .social-link:hover {
        transform: translateY(-2px);
    }
}

/* =========================== */
/* ASPECT RATIO UTILITIES */
/* =========================== */

.aspect-ratio-16-9 {
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.aspect-ratio-4-3 {
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.aspect-ratio-1-1 {
    aspect-ratio: 1 / 1;
    object-fit: cover;
}

/* =========================== */
/* ADVANCED RESPONSIVE IMAGES */
/* =========================== */

.img-responsive {
    max-width: 100%;
    height: auto;
    object-fit: cover;
    loading: lazy;
}

.img-cover {
    object-fit: cover;
    width: 100%;
    height: 100%;
}

.img-contain {
    object-fit: contain;
    width: 100%;
    height: 100%;
}

/* =========================== */
/* SCROLL ENHANCEMENTS */
/* =========================== */

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

/* Custom scrollbar for webkit browsers */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-background-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent-blue-neon);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-yellow);
}

/* =========================== */
/* FINAL OPTIMIZATIONS */
/* =========================== */

/* Prevent layout shift during font loading */
.font-display-swap {
    font-display: swap;
}

/* Optimize background image loading */
.bg-lazy {
    background-image: none;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.bg-lazy.loaded {
    background-image: var(--bg-image);
}

/* =========================== */
/* PWA AND MOBILE ENHANCEMENTS */
/* =========================== */

/* PWA Splash Screen styling */
@media (display-mode: standalone) {
    body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }
    
    #main-header {
        position: fixed;
        top: env(safe-area-inset-top);
    }
    
    .hero-section {
        padding-top: calc(var(--header-height) + env(safe-area-inset-top) + 20px);
    }
}

/* Viewport height fixes for mobile browsers */
.full-height {
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
}

/* Enhanced mobile styles for better UX */
.mobile-device {
    /* Improve text rendering on mobile */
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Swipe gesture indicators */
.swipeable {
    position: relative;
}

.swipeable::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background: linear-gradient(to bottom, transparent, var(--color-accent-blue-neon), transparent);
    border-radius: 2px;
    opacity: 0.6;
    animation: swipeIndicator 2s ease-in-out infinite;
}

@keyframes swipeIndicator {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Enhanced touch feedback */
.btn:active,
.social-link:active,
.mobile-menu-toggle:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
}

/* Improved form styles for mobile */
input[type="text"],
input[type="email"],
input[type="tel"],
textarea,
select {
    font-size: 16px; /* Prevent zoom on iOS */
    border-radius: var(--border-radius-main);
    border: 2px solid var(--color-accent-blue-neon);
    background-color: var(--color-background-elements);
    color: var(--color-text-light);
    padding: 12px 16px;
    width: 100%;
    box-sizing: border-box;
    transition: all var(--transition-normal);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-accent-yellow);
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

input.error,
textarea.error {
    border-color: #ff4444;
    box-shadow: 0 0 10px rgba(255, 68, 68, 0.3);
}

input.valid,
textarea.valid {
    border-color: #44ff44;
    box-shadow: 0 0 10px rgba(68, 255, 68, 0.3);
}

/* Mobile-specific animations */
@media (max-width: 767px) {
    .feature-card {
        animation: slideInUp 0.6s ease-out;
        animation-fill-mode: both;
    }
    
    .feature-card:nth-child(1) { animation-delay: 0.1s; }
    .feature-card:nth-child(2) { animation-delay: 0.2s; }
    .feature-card:nth-child(3) { animation-delay: 0.3s; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Pull-to-refresh indicator */
.pull-to-refresh {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background: var(--color-accent-blue-neon);
    color: var(--color-text-dark);
    padding: 10px 20px;
    border-radius: 0 0 var(--border-radius-main) var(--border-radius-main);
    font-weight: 700;
    z-index: 1001;
    transition: transform var(--transition-normal);
}

.pull-to-refresh.active {
    transform: translateX(-50%) translateY(0);
}

/* Mobile menu enhancements */
@media (max-width: 767px) {
    .main-nav {
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }
    
    .main-nav::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, 
            rgba(30, 30, 30, 0.95) 0%, 
            rgba(18, 18, 18, 0.98) 100%);
        z-index: -1;
    }
    
    /* Swipe gesture area */
    .main-nav.swipeable::after {
        left: 10px;
        right: auto;
    }
}

/* Enhanced loading states */
.loading-skeleton {
    background: linear-gradient(90deg, 
        var(--color-background-elements) 25%, 
        rgba(255, 255, 255, 0.1) 50%, 
        var(--color-background-elements) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Battery-conscious animations */
@media (prefers-reduced-motion: no-preference) {
    .hero-main-title {
        animation: glow 3s ease-in-out infinite alternate;
    }
    
    @keyframes glow {
        from {
            text-shadow: 0 0 15px var(--color-accent-blue-neon), 
                         0 0 5px var(--color-accent-blue-neon);
        }
        to {
            text-shadow: 0 0 25px var(--color-accent-blue-neon), 
                         0 0 15px var(--color-accent-blue-neon),
                         0 0 5px var(--color-accent-blue-neon);
        }
    }
}

/* Network status indicator */
.network-status {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-accent-yellow);
    color: var(--color-text-dark);
    padding: 8px 16px;
    border-radius: var(--border-radius-main);
    font-weight: 700;
    font-size: 0.9rem;
    z-index: 1002;
    transition: transform var(--transition-normal);
}

.network-status.offline {
    background: #ff4444;
    color: white;
}

.network-status.show {
    transform: translateX(-50%) translateY(0);
}

/* iOS specific fixes */
@supports (-webkit-touch-callout: none) {
    .btn,
    .social-link {
        -webkit-touch-callout: none;
        -webkit-user-select: none;
    }
    
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    textarea {
        -webkit-appearance: none;
        border-radius: var(--border-radius-main);
    }
}

/* Android specific fixes */
@media screen and (-webkit-min-device-pixel-ratio: 0) {
    select {
        background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='%2300E5FF' d='m2 0 2 3H0l2-3Z'/%3E%3C/svg%3E");
        background-repeat: no-repeat;
        background-position: right 12px center;
        background-size: 12px;
        padding-right: 40px;
    }
}

/* Enhanced accessibility for mobile */
@media (max-width: 767px) {
    /* Larger focus indicators on mobile */
    .btn:focus,
    .social-link:focus,
    input:focus,
    textarea:focus {
        outline: 3px solid var(--color-accent-yellow);
        outline-offset: 3px;
    }
    
    /* Better error messages */
    .error-message {
        font-size: 1rem;
        padding: 10px;
        background: rgba(255, 68, 68, 0.1);
        border: 1px solid #ff4444;
        border-radius: var(--border-radius-main);
        margin-top: 8px;
    }
    
    .success-message {
        font-size: 1rem;
        padding: 10px;
        background: rgba(68, 255, 68, 0.1);
        border: 1px solid #44ff44;
        border-radius: var(--border-radius-main);
        margin-top: 8px;
    }
}

/* Performance optimizations for mobile */
.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Image optimization for mobile */
.responsive-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    loading: lazy;
    decoding: async;
}

/* Lazy loading placeholder */
.lazy-placeholder {
    background: linear-gradient(135deg, 
        var(--color-background-elements) 0%, 
        rgba(255, 255, 255, 0.05) 50%, 
        var(--color-background-elements) 100%);
    background-size: 400% 400%;
    animation: shimmer 2s ease-in-out infinite;
}

@keyframes shimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Mobile-first grid system improvements */
.mobile-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--grid-gap-mobile);
}

@media (min-width: 480px) {
    .mobile-grid.cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .mobile-grid.cols-3 {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--grid-gap-desktop);
    }
}

/* Enhanced button styles for mobile */
@media (max-width: 767px) {
    .btn {
        min-height: 48px;
        font-size: 1rem;
        padding: 14px 20px;
        touch-action: manipulation;
        user-select: none;
        -webkit-user-select: none;
        -webkit-touch-callout: none;
    }
    
    .btn:active {
        background-color: var(--color-accent-blue-neon);
        color: var(--color-text-dark);
        transform: scale(0.98);
    }
}

/* Improved spacing system for mobile */
.mobile-spacing {
    margin-bottom: clamp(20px, 5vw, 40px);
}

.mobile-padding {
    padding: clamp(15px, 4vw, 30px);
}

/* Enhanced typography for mobile readability */
@media (max-width: 767px) {
    body {
        line-height: 1.6;
        word-spacing: 0.1em;
    }
    
    p {
        margin-bottom: 1.2em;
    }
    
    /* Better list styling */
    ul li,
    ol li {
        margin-bottom: 0.8em;
        line-height: 1.7;
    }
}

/* Mobile-specific utility classes */
@media (max-width: 767px) {
    .mobile-full-width {
        width: 100vw;
        margin-left: calc(-50vw + 50%);
    }
    
    .mobile-center {
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }
    
    .mobile-hide {
        display: none !important;
    }
    
    .mobile-show {
        display: block !important;
    }
    
    .mobile-flex {
        display: flex !important;
        flex-direction: column;
        align-items: center;
    }
}