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

:root {
    --primary: #13ce66;
    --primary-dark: #0fa954;
    --text: #000;
    --background: #fff;
    --light-gray: #f5f5f5;
    --gray: #e0e0e0;
    --dark-gray: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    background-color: var(--background);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 80px 0;
}

.accent {
    color: var(--primary);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 50px;
    text-align: center;
    line-height: 1.3;
}

/* Шапка */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--background);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo h2 {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.logo p {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s;
}

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

.contact-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--light-gray);
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: 500;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
}

/* Герой-секция */
.hero {
    padding-top: 150px;
    padding-bottom: 100px;
    background: linear-gradient(135deg, rgba(19, 206, 102, 0.1) 0%, rgba(255, 255, 255, 1) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: var(--dark-gray);
}

.hero-info {
    margin-bottom: 40px;
}

.season {
    font-size: 1.2rem;
    font-weight: 600;
}

.btn-hero {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-hero:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(19, 206, 102, 0.2);
}

/* О марафоне */
.about-section {
    background-color: var(--light-gray);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.about-card {
    background-color: var(--background);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: transform 0.3s;
}

.about-card:hover {
    transform: translateY(-10px);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.about-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.start-date {
    text-align: center;
    background-color: var(--primary);
    color: white;
    padding: 30px;
    border-radius: 10px;
    margin-top: 30px;
}

.start-date h3 {
    margin-bottom: 10px;
    font-size: 1.8rem;
}

.start-date p {
    font-size: 1.2rem;
    font-weight: 600;
}

/* Задания */
.tasks-intro {
    background-color: var(--light-gray);
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 50px;
}

.tasks-intro p {
    margin-bottom: 15px;
}

.highlight {
    background-color: rgba(19, 206, 102, 0.1);
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
    font-weight: 500;
}

.hashtag {
    color: var(--primary);
    font-weight: 600;
}

.prize-info {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
    padding: 15px;
    background-color: rgba(19, 206, 102, 0.1);
    border-radius: 8px;
}

.prize-info i {
    font-size: 1.8rem;
    color: var(--primary);
}

.tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.task-card {
    background-color: var(--background);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-top: 5px solid var(--primary);
    transition: transform 0.3s;
}

.task-card:hover {
    transform: translateY(-5px);
}

.task-header {
    background-color: rgba(19, 206, 102, 0.1);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.task-number {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.task-header h3 {
    font-size: 1.5rem;
}

.task-date {
    color: var(--dark-gray);
    font-weight: 500;
}

.task-content {
    padding: 25px;
}

.task-instructions {
    list-style: none;
    margin-top: 15px;
}

.task-instructions li {
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.task-instructions i {
    color: var(--primary);
    margin-top: 3px;
}

/* Форма */
.submit-section {
    background-color: var(--light-gray);
}

.form-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.task-form {
    background-color: var(--background);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: border 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.checkbox-group input {
    width: auto;
    margin-right: 10px;
}

.checkbox-text {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.btn-submit {
    width: 100%;
    background-color: var(--primary);
    color: white;
    padding: 18px;
    border-radius: 8px;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-submit:hover {
    background-color: var(--primary-dark);
}

.form-info {
    padding: 20px;
}

.form-info h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.form-info ol {
    margin-left: 20px;
    margin-bottom: 30px;
}

.form-info li {
    margin-bottom: 10px;
}

.contact-form {
    background-color: rgba(19, 206, 102, 0.1);
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
}

/* Подвал */
.footer {
    background-color: var(--dark-gray);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.footer-tagline {
    margin-top: 10px;
    font-style: italic;
}

.footer-contacts h3, .footer-nav h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.footer-contacts p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-nav a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Адаптивность */
@media (max-width: 992px) {
    .form-container {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--background);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .tasks-grid {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 60px 0;
    }
}

@media (max-width: 576px) {
    .hero {
        padding-top: 120px;
        padding-bottom: 60px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .task-form {
        padding: 25px;
    }
}