/* Landing Page Styles for MathSolver */

/* ===== Hero Section - Compact (Above Application) ===== */
.hero-section-compact {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    color: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-xl);
}

.hero-title-compact {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: white;
}

.hero-subtitle-compact {
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.95);
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Full Hero Section ===== */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--space-3xl) var(--space-lg);
    text-align: center;
    color: white;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    color: white;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
    color: rgba(255, 255, 255, 0.95);
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-cta .btn-primary {
    background-color: white;
    color: var(--color-primary);
    font-weight: 600;
}

.hero-cta .btn-primary:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* ===== Section Titles ===== */
.section-title-center {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

/* ===== Features Section ===== */
.features-section {
    padding: var(--space-3xl) var(--space-lg);
    background-color: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-primary);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.feature-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* ===== How It Works Section ===== */
.how-it-works-section {
    padding: var(--space-3xl) var(--space-lg);
    background-color: var(--bg-secondary);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.step-item {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-lg);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.step-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* ===== Topics Section ===== */
.topics-section {
    padding: var(--space-3xl) var(--space-lg);
    background-color: var(--bg-primary);
}

.topics-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    max-width: 1000px;
    margin: 0 auto var(--space-xl);
}

.topic-item {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    border-left: 4px solid var(--color-primary);
    transition: all var(--transition-fast);
}

.topic-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.topic-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.topic-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.topics-footer {
    text-align: center;
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== FAQ Section ===== */
.faq-section {
    padding: var(--space-3xl) var(--space-lg);
    background-color: var(--bg-secondary);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    border-left: 4px solid var(--color-primary);
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.faq-answer {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero-section {
        padding: var(--space-xl) var(--space-md);
    }

    .features-section,
    .how-it-works-section,
    .topics-section,
    .faq-section {
        padding: var(--space-xl) var(--space-md);
    }

    .features-grid,
    .steps-container,
    .topics-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta .btn {
        width: 100%;
    }
}

/* ===== Smooth Scrolling ===== */
html {
    scroll-behavior: smooth;
}

/* ===== Focus Styles for Accessibility ===== */
.hero-cta .btn-primary:focus,
.feature-card:focus,
.faq-item:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}