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

:root {
    --primary-color: #20beff;
    --secondary-color: #0052cc;
    --accent-color: #ff6b6b;
    --dark-bg: #1a1a2e;
    --light-bg: #f8f9fa;
    --text-dark: #2d3748;
    --text-light: #718096;
    --white: #ffffff;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
}

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

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: var(--card-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
    padding: 0.75rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    display: inline-block;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Features Section */
.features {
    padding: 5rem 0;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.feature-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.feature-link:hover {
    color: var(--secondary-color);
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.95;
}

/* Content Section */
.content-section {
    padding: 4rem 0;
}

/* Resource Categories */
.resource-category {
    margin-bottom: 4rem;
}

.resource-category h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.resource-card h3 {
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.resource-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.resource-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.resource-link:hover {
    color: var(--secondary-color);
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.tip-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    border-left: 4px solid var(--primary-color);
}

.tip-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.tip-number {
    position: absolute;
    top: -15px;
    left: 20px;
    background: var(--primary-color);
    color: var(--white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.tip-card h3 {
    color: var(--text-dark);
    margin-top: 1rem;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.tip-card p {
    color: var(--text-light);
    line-height: 1.8;
}

.bonus-section {
    margin-top: 4rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 3rem;
    border-radius: 10px;
    color: var(--white);
}

.bonus-section h2 {
    margin-bottom: 2rem;
    font-size: 2rem;
}

.bonus-tips {
    display: grid;
    gap: 1rem;
}

.bonus-tip {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.bonus-tip strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

/* Concepts */
.concept-category {
    margin-bottom: 3rem;
}

.concept-category h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.concept-list {
    display: grid;
    gap: 1rem;
}

.concept-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--primary-color);
    transition: transform 0.3s;
}

.concept-item:hover {
    transform: translateX(5px);
}

.concept-item h3 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.concept-item p {
    color: var(--text-light);
    line-height: 1.6;
}

.learning-path {
    margin-top: 4rem;
    background: var(--white);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
}

.learning-path h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.path-steps {
    display: grid;
    gap: 2rem;
}

.path-step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    background: var(--primary-color);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

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

/* Competitions */
.competition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.competition-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    text-align: center;
}

.competition-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.competition-card.featured {
    border: 2px solid var(--primary-color);
}

.competition-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: var(--accent-color);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.competition-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.competition-card h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.competition-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.competition-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-tag {
    background: var(--light-bg);
    color: var(--text-dark);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
}

.competition-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.competition-link:hover {
    color: var(--secondary-color);
}

.comparison-section {
    margin: 4rem 0;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
}

.comparison-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-dark);
    font-size: 2rem;
}

.comparison-table {
    overflow-x: auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.comparison-table th {
    background: var(--primary-color);
    color: var(--white);
    font-weight: 600;
}

.comparison-table tr:hover {
    background: var(--light-bg);
}

.tips-section {
    margin-top: 4rem;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
}

.tips-section h2 {
    margin-bottom: 2rem;
    color: var(--text-dark);
    font-size: 2rem;
}

.tips-list {
    display: grid;
    gap: 1rem;
}

.tip-item {
    padding: 1rem;
    background: var(--light-bg);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.tip-item strong {
    color: var(--text-dark);
    display: block;
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background: var(--dark-bg);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--card-shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .feature-grid,
    .resource-grid,
    .tips-grid,
    .competition-grid {
        grid-template-columns: 1fr;
    }

    .path-step {
        flex-direction: column;
        text-align: center;
    }

    .comparison-table {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 4rem 0;
    }

    .page-header {
        padding: 3rem 0;
    }

    .content-section {
        padding: 2rem 0;
    }
}