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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --dark-bg: #1e293b;
    --light-bg: #f8fafc;
    --text-dark: #0f172a;
    --text-light: #64748b;
    --white: #ffffff;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html {
    scroll-behavior: smooth;
}

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(--white);
}

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

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

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

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.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;
}

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

/* Language Switcher */
.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.lang-icon {
    font-size: 1.2rem;
}

.lang-text {
    font-weight: 700;
}

/* 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-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.hero-tagline {
    font-size: 1.25rem;
    font-style: italic;
    opacity: 0.9;
    margin-top: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
    cursor: pointer;
    border: 2px solid transparent;
}

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

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

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

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

.btn-download {
    background-color: var(--success-color);
    color: var(--white);
    font-size: 1.25rem;
    padding: 1.25rem 2.5rem;
}

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

/* Sections */
.section {
    padding: 5rem 0;
}

.section-light {
    background-color: var(--light-bg);
}

.section-dark {
    background: linear-gradient(135deg, var(--dark-bg) 0%, #334155 100%);
    color: var(--white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: inherit;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 3rem;
    margin-top: 2rem;
}

.content-block {
    line-height: 1.8;
}

.content-block h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.lead {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.principle-list {
    list-style: none;
    padding: 0;
}

.principle-list li {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.principle-list li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Steps Grid */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-bottom: 4rem;
}

.step {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

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

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

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

/* Formula Box */
.formula-box {
    background-color: var(--light-bg);
    border-left: 4px solid var(--primary-color);
    padding: 2.5rem;
    border-radius: 8px;
    margin-top: 3rem;
}

.formula-box h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.formula-description {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.formula {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    text-align: center;
    margin: 1.5rem 0;
}

.formula-note {
    font-style: italic;
    color: var(--text-light);
    margin-top: 1rem;
}

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

.benefit-card {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
    text-align: center;
}

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

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

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.benefit-card p {
    line-height: 1.7;
    color: var(--text-light);
}

/* Cases Grid */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 2.5rem;
}

.case-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.case-card h3 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

.case-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-label {
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-detail {
    font-size: 0.95rem;
    color: var(--text-light);
}

.case-result {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--success-color);
}

.case-result strong {
    display: block;
    font-size: 1.25rem;
    color: var(--success-color);
    margin-bottom: 0.75rem;
}

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

/* Whitepaper Section */
.whitepaper-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.whitepaper-description {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.whitepaper-info {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2.5rem;
    text-align: left;
}

.whitepaper-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.whitepaper-info ul {
    list-style: none;
    padding: 0;
}

.whitepaper-info li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.whitepaper-info li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.whitepaper-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.whitepaper-buttons .btn-download {
    width: 100%;
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 3rem 0 1.5rem;
}

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

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--text-light);
}

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

.footer-section li {
    margin-bottom: 0.5rem;
}

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

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .content-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
    }

    .steps-grid,
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}