/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #f59e0b;
    --dark: #1e293b;
    --dark-light: #334155;
    --light: #f1f5f9;
    --white: #ffffff;
    --success: #10b981;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: var(--font-main);
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== NAVIGATION ===== */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

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

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav-links a:hover {
    background: rgba(255, 255, 255, 0.1);
    opacity: 0.9;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

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

.hero h2 {
    font-family: var(--font-display);
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

/* ===== SECTIONS ===== */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--dark);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--dark-light);
    margin-bottom: var(--spacing-xl);
}

/* ===== CARDS ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 2px solid var(--light);
}

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

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary);
}

.card p {
    color: var(--dark-light);
    line-height: 1.6;
}

/* ===== ALERTS ===== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-xl) 0;
    border-left: 4px solid;
}

.alert.info {
    background: #eff6ff;
    border-color: var(--info);
    color: #1e40af;
}

.alert.warning {
    background: #fffbeb;
    border-color: var(--warning);
    color: #92400e;
}

.alert strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ===== POWER STACK ===== */
.power-stack {
    background: linear-gradient(135deg, #f6f8fb 0%, #ffffff 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--shadow-lg);
}

.power-stack h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary);
}

.power-stack > p {
    font-size: 1.125rem;
    color: var(--dark-light);
    margin-bottom: var(--spacing-lg);
}

.stack-layers {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.layer {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--light);
    transition: all 0.3s;
}

.layer:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.layer-number {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.layer-content {
    flex: 1;
}

.layer-content h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--dark);
}

.layer-content p {
    color: var(--dark-light);
    margin-bottom: var(--spacing-xs);
}

.layer-tools {
    display: inline-block;
    background: var(--light);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 500;
}

/* ===== SESSION CARDS ===== */
.session-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    border: 2px solid var(--light);
    transition: all 0.3s;
}

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

.session-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.session-number {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.session-header h3 {
    flex: 1;
    font-size: 1.75rem;
    margin: 0;
}

.session-duration {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.session-content {
    padding: var(--spacing-xl);
}

.session-description {
    font-size: 1.125rem;
    color: var(--dark-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.session-objectives {
    background: var(--light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.session-objectives h4 {
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.session-objectives ul {
    list-style: none;
}

.session-objectives li {
    padding: var(--spacing-xs) 0;
    color: var(--dark);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* ===== TOOLS OVERVIEW ===== */
.tools-overview {
    background: linear-gradient(135deg, #f6f8fb 0%, #ffffff 100%);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.tool-category {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--light);
    transition: all 0.3s;
}

.tool-category:hover {
    border-color: var(--primary-light);
    transform: translateY(-3px);
}

.tool-category h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1.5rem;
}

.tool-category > p {
    color: var(--dark-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.tool-list {
    list-style: none;
}

.tool-list li {
    padding: var(--spacing-xs) 0;
    color: var(--dark);
    border-bottom: 1px solid var(--light);
}

.tool-list li:last-child {
    border-bottom: none;
}

.tool-list strong {
    color: var(--primary);
}

/* ===== RESOURCES ===== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.resource-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    border: 2px solid var(--light);
    transition: all 0.3s;
}

.resource-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-light);
}

.resource-card h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.resource-card p {
    color: var(--dark-light);
    margin-bottom: var(--spacing-md);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-light);
}

.footer-section p, .footer-section li {
    opacity: 0.8;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    opacity: 0.7;
    font-size: 0.875rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-links {
        width: 100%;
        margin-top: var(--spacing-md);
        justify-content: center;
        gap: var(--spacing-md);
    }
    
    .session-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card, .session-card, .tool-category {
    animation: fadeIn 0.5s ease-out;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}