/* Глобальные переменные и стили */
:root {
    --font-main: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --color-text-primary: #2d2d2d;
    --color-text-secondary: #666;
    --color-bg-light: #fff;
    --color-bg-medium: #f5f7fa;
    --color-header-bg: black;
    --color-accent: #1a3c6e;
    --shadow-soft: 0 8px 25px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 12px 35px rgba(0, 0, 0, 0.15);
    --border-radius-main: 1rem;
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --header-height: 6rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg-light);
    color: var(--color-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Шапка сайта */
header {
    background: var(--color-header-bg);
    backdrop-filter: blur(15px);
    color: var(--color-bg-light);
    padding: 0 1rem;
    height: var(--header-height);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-soft);
    display: flex;
    align-items: center;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 95%;
    margin: 0 auto;
}

.logo img {
    height: 4rem;
    transition: transform 0.3s ease;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.logo img:hover {
    transform: scale(1.08);
}

.main-nav {
    position: relative;
}

/* Стили для адаптивной навигации */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
    padding: 0.5rem;
}

.hamburger-line {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-bg-light);
    margin: 5px 0;
    transition: all 0.3s ease-in-out;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.nav-wrapper {
    display: block;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1rem;
    margin: 0;
}

nav ul li a {
    font-size: 1rem;
    padding: 0.6rem 1rem;
    border-radius: var(--border-radius-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

nav ul li a:hover {
    background: var(--color-bg-light);
    color: var(--color-text-primary);
    transform: translateY(-3px);
}

/* Основное содержимое */
main {
    margin-top: var(--header-height);
}

section {
    padding: 6rem 2rem;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--color-text-primary);
}

/* Блок 1 - Герой */
.hero {
    min-height: 90vh;
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.8)), url('background/abi.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: scroll;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-bg-light);
    padding: 3rem 1rem;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    animation: fadeInUp 1.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    margin: 1rem 0;
    font-weight: 800;
}

.hero h2 {
    font-size: clamp(1rem, 3vw, 1.2rem);
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero p {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition-smooth);
    display: inline-block;
}

.hero-cta:hover {
    background: var(--color-bg-light);
    color: var(--color-text-primary);
    transform: scale(1.05);
}

/* Общие стили для анимированных карточек */
.animated-item {
    opacity: 0;
    transform: translateY(40px) scale(0.95);
    transition: opacity 0.6s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animated-item.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Блок 2 - О программе обучения */
.program {
    background: var(--color-bg-light);
}

.program-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: justify;
    background: var(--color-bg-light);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
}

.program-content p {
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    color: var(--color-text-secondary);
}

/* Блок 3 - Как подать документы */
.application {
    background: var(--color-bg-medium);
}

.application-steps {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.step {
    text-align: center;
    background: var(--color-bg-light);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.step:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.step h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.step p {
    color: var(--color-text-secondary);
}

/* Блок 4 - Проходные баллы */
.cutoff {
    background: var(--color-bg-light);
    padding: 2rem;
}

.cutoff-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.cutoff-subsection {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.cutoff-subsection h3 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.cutoff-subsection p {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
}

.cutoff-items {
    display: grid;
    grid-template-columns: 1fr 1fr; /* Две колонки */
    grid-template-rows: auto auto; /* Две строки */
    gap: 2rem;
    justify-content: center;
}

.cutoff-item {
    text-align: center;
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.cutoff-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.cutoff-item h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.cutoff-item p {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-text-primary);
}

.bottom-cutoff-item {
    grid-column: 1 / -1; /* Занимает обе колонки */
    text-align: center;
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.bottom-cutoff-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.bottom-cutoff-item h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.bottom-cutoff-item p {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-text-primary);
}

/* Блок 5 - Довузовская подготовка */
.preparatory {
    background: var(--color-bg-medium);
}

.preparatory-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.preparatory-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.preparatory-item {
    text-align: center;
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.preparatory-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.preparatory-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.preparatory-item p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.preparatory-cta {
    font-size: 1rem;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius-main);
    background: var(--color-bg-light);
    color: var(--color-text-primary);
    border: 1px solid var(--color-text-primary);
    transition: var(--transition-smooth);
}

.preparatory-cta:hover {
    background: var(--color-accent);
    color: var(--color-bg-light);
    border: none;
    transform: translateY(-3px);
}

.preparatory-info {
    text-align: center;
    background: var(--color-bg-light);
    padding: 2.5rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
}

.preparatory-info h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.preparatory-info ul {
    list-style: none;
    margin-bottom: 1rem;
}

.preparatory-info ul li {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.preparatory-info p {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* Блок 6 - Календарные планы обучения */
.curriculum {
    background: var(--color-bg-light);
}

.curriculum-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}



.curriculum-item {
    text-align: center;
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.curriculum-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.curriculum-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.curriculum-item p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.curriculum-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.curriculum-cta {
    font-size: 1rem;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius-main);
    transition: var(--transition-smooth);
}

.curriculum-cta.download {
    background: var(--color-accent);
    color: var(--color-bg-light);
}

.curriculum-cta.download:hover {
    background: var(--color-bg-light);
    color: var(--color-text-primary);
    transform: translateY(-3px);
}

.curriculum-cta.view {
    background: var(--color-bg-light);
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.curriculum-cta.view:hover {
    background: var(--color-accent);
    color: var(--color-bg-light);
    transform: translateY(-3px);
}

/* Подвал сайта */
footer {
    background: #111;
    color: #eee;
    padding: 5rem 2rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.footer-map {
    width: 100%;
    height: 350px;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    background-color: #333; /* Placeholder color */
}

.footer-contacts {
    background: #1c1c1c;
    padding: 2rem;
    border-radius: var(--border-radius-main);
}

.footer-contacts h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
}

.contacts-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.contacts-column h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--color-bg-light);
}

.contacts-column p {
    margin-bottom: 0.8rem;
    color: #aaa;
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    font-size: 1.8rem;
    color: #aaa;
    transition: var(--transition-smooth);
}

.social-links a:hover {
    color: var(--color-bg-light);
    transform: scale(1.1);
}

.footer-copyright {
    text-align: center;
    padding-top: 2rem;
    font-size: 0.9rem;
    color: #888;
    border-top: 1px solid #444;
}

/* Анимации */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(2rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Адаптивность */
@media (max-width: 1023px) {
    .nav-toggle {
        display: block;
    }

    .nav-wrapper {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-header-bg);
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        padding: 2rem;
    }

    .nav-wrapper.visible {
        transform: translateX(0);
    }

    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }

    nav ul li a {
        font-size: 1.2rem;
    }
}

@media (max-width: 768px) {
    section {
        padding: 4rem 1rem;
    }

    .bottom-cutoff-item, .cutoff-items, .preparatory-items, .curriculum-items {
        grid-template-columns: 1fr;
    }

    .contacts-columns {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .contacts-column p {
        justify-content: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (min-width: 1024px) {
    .bottom-cutoff-item, .cutoff-items, .preparatory-items, .curriculum-items {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero {
        background-attachment: fixed;
    }
}