/* ==================== Global Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #2d5a96;
    --accent-color: #4f46e5;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f3f4f6;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
}

html {
    scroll-behavior: smooth;
}

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

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

/* ==================== Header ==================== */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.logo {
    flex: 0 0 auto;
    white-space: nowrap;
}

.logo h1 {
    font-size: 22px;
    color: var(--primary-color);
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo .accent {
    color: var(--accent-color);
    font-weight: 800;
}

.logo .tagline {
    font-size: 11px;
    color: var(--accent-color);
    margin-top: 3px;
    font-weight: 600;
}

.nav {
    display: flex;
    gap: 25px;
    align-items: center;
    flex: 1;
    justify-content: center;
}

.nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 13px;
    font-weight: 600;
    transition: color 0.3s ease;
    position: relative;
    border: none;
}

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

.nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    bottom: -6px;
    left: 0;
    background-color: transparent;
    transition: width 0.3s ease;
    display: none;
}

.nav a:hover::after {
    width: 0;
    display: none;
}

.cta-button {
    padding: 11px 28px;
    background: linear-gradient(135deg, var(--accent-color) 0%, #4338ca 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    text-decoration: none;
}

.cta-button:hover {
    background: linear-gradient(135deg, #4338ca 0%, #3730a3 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
}

/* ==================== Hero Section ==================== */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #f3f4f6 0%, #ffffff 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-content h2 {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
    line-height: 1.2;
    font-weight: 800;
}

.hero-content h2 .highlight {
    color: var(--accent-color);
    display: inline;
    background: linear-gradient(135deg, var(--accent-color) 0%, #4338ca 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 16px;
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.hero-description {
    font-size: 15px;
    color: var(--text-light);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-cta {
    display: inline-block;
    padding: 14px 40px;
    background: linear-gradient(135deg, var(--accent-color) 0%, #4338ca 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    text-decoration: none;
}

.hero-cta:hover {
    background: linear-gradient(135deg, #4338ca 0%, #3730a3 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
}

.guarantee {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 600;
}

.visual-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.visual-card p {
    font-size: 18px;
    color: var(--primary-color);
    font-weight: 600;
}

/* ==================== Education Section ==================== */
.education {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.education h2 {
    font-size: 36px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.content-block {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.content-block h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.content-block p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ==================== Dimensions Section ==================== */
.dimensions {
    padding: 80px 0;
    background-color: white;
}

.dimensions h2 {
    font-size: 36px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 15px;
}

.section-subtitle {
    text-align: center;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 50px;
    font-weight: 500;
}

.dimensions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.dimension-card {
    background: linear-gradient(135deg, #f3f4f6 0%, #ffffff 100%);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.dimension-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

.dimension-number {
    display: inline-flex;
    width: 40px;
    height: 40px;
    background-color: var(--accent-color);
    color: white;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
}

.dimension-card h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.dimension-card p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.8;
}

.dimension-traits {
    list-style: none;
    font-size: 13px;
}

.dimension-traits li {
    color: var(--accent-color);
    margin-bottom: 8px;
    padding-left: 0;
}

/* ==================== Scientific Section ==================== */
.scientific {
    padding: 80px 0;
    background: linear-gradient(135deg, #1e3a8a 0%, #2d5a96 100%);
    color: white;
}

.scientific h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: white;
}

.scientific-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.research-item {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 30px;
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.research-item h4 {
    font-size: 18px;
    margin-bottom: 12px;
    color: #e0e7ff;
}

.research-item p {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 15px;
}

.research-citation {
    display: inline-block;
    font-size: 12px;
    color: #93c5fd;
    font-style: italic;
    padding-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

/* ==================== Features Section ==================== */
.features {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.features h2 {
    font-size: 36px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.feature-card h3 {
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ==================== How It Works ==================== */
.how-it-works {
    padding: 80px 0;
    background-color: white;
}

.how-it-works h2 {
    font-size: 36px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
}

.steps {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.step {
    flex: 1;
    background-color: var(--bg-light);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
}

.step-number {
    display: inline-flex;
    width: 50px;
    height: 50px;
    background-color: var(--accent-color);
    color: white;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
}

.step h4 {
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.step p {
    font-size: 14px;
    color: var(--text-light);
}

.step-arrow {
    font-size: 24px;
    color: var(--accent-color);
    flex: 0 0 30px;
    text-align: center;
}

/* ==================== Testimonials ==================== */
.testimonials {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.testimonials h2 {
    font-size: 36px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.testimonial-card .quote {
    font-size: 15px;
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 15px;
    font-style: italic;
}

.testimonial-card .author {
    font-size: 13px;
    color: var(--accent-color);
    font-weight: 600;
}

/* ==================== FAQ Section ==================== */
.faq {
    padding: 80px 0;
    background-color: white;
}

.faq h2 {
    font-size: 36px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    padding: 25px;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item:hover {
    background-color: var(--bg-light);
}

.faq-item h4 {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 12px;
    font-weight: 600;
}

.faq-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ==================== Final CTA ==================== */
.final-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, #1e3a8a 0%, #2d5a96 100%);
    color: white;
    text-align: center;
}

.final-cta h2 {
    font-size: 40px;
    margin-bottom: 15px;
    color: white;
}

.final-cta p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
}

.large-cta {
    padding: 16px 50px;
    background-color: white;
    color: var(--accent-color);
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    margin-bottom: 30px;
    display: inline-block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    text-decoration: none;
}

.large-cta:hover {
    background-color: #f3f4f6;
    transform: translateY(-3px);
}

.cta-note {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 20px;
}

/* ==================== Footer ==================== */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 60px 0 20px;
}

.footer .container {
    padding: 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 40px;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 15px;
    color: #e0e7ff;
}

.footer-section p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-section ul a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
}

.footer-bottom p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
        padding: 15px 0;
    }

    .logo h1 {
        font-size: 18px;
    }

    .nav {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
        flex: none;
    }

    .cta-button {
        padding: 10px 20px;
        font-size: 12px;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-content h2 {
        font-size: 32px;
        line-height: 1.3;
    }

    .hero-description {
        font-size: 14px;
        line-height: 1.7;
    }

    .visual-card {
        padding: 30px;
    }

    .card-icon {
        font-size: 48px;
    }

    .content-grid,
    .dimensions-grid,
    .scientific-grid,
    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .dimension-card {
        padding: 25px;
    }

    .feature-card {
        padding: 25px;
    }

    .steps {
        flex-direction: column;
        gap: 15px;
    }

    .step {
        padding: 25px;
    }

    .step-number {
        width: 45px;
        height: 45px;
        font-size: 20px;
    }

    .step-arrow {
        transform: rotate(90deg);
        margin: 5px 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .final-cta h2 {
        font-size: 28px;
        line-height: 1.3;
    }

    .final-cta p {
        font-size: 16px;
    }

    .large-cta {
        padding: 12px 30px;
        font-size: 14px;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 12px 0;
    }

    .header .container {
        gap: 10px;
        flex-direction: column;
        align-items: stretch;
    }

    .logo {
        text-align: center;
    }

    .logo h1 {
        font-size: 16px;
        margin-bottom: 5px;
    }

    .logo .tagline {
        font-size: 10px;
    }

    .nav {
        gap: 8px;
        font-size: 11px;
    }

    .nav a {
        font-size: 11px;
        padding: 6px 8px;
    }

    .cta-button {
        padding: 8px 16px;
        font-size: 11px;
        width: 100%;
    }

    .hero {
        padding: 40px 0;
    }

    .hero .container {
        gap: 20px;
    }

    .hero-content h2 {
        font-size: 20px;
        line-height: 1.3;
        margin-bottom: 12px;
    }

    .hero-subtitle {
        font-size: 12px;
        margin-bottom: 12px;
    }

    .hero-description {
        font-size: 13px;
        line-height: 1.6;
        margin-bottom: 15px;
    }

    .hero-cta {
        padding: 10px 24px;
        font-size: 13px;
        width: 100%;
        margin-bottom: 12px;
    }

    .guarantee {
        font-size: 11px;
    }

    .visual-card {
        padding: 20px;
    }

    .card-icon {
        font-size: 40px;
        margin-bottom: 12px;
    }

    .visual-card p {
        font-size: 14px;
    }

    .education {
        padding: 40px 0;
    }

    .education h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }

    .content-block {
        padding: 20px;
    }

    .content-block h3 {
        font-size: 16px;
        margin-bottom: 10px;
    }

    .content-block p {
        font-size: 13px;
        line-height: 1.6;
    }

    .dimensions {
        padding: 40px 0;
    }

    .dimensions h2 {
        font-size: 20px;
        margin-bottom: 10px;
    }

    .section-subtitle {
        font-size: 12px;
        margin-bottom: 25px;
    }

    .dimension-card {
        padding: 20px;
    }

    .dimension-number {
        width: 35px;
        height: 35px;
        font-size: 16px;
        margin-bottom: 10px;
    }

    .dimension-card h3 {
        font-size: 16px;
        margin-bottom: 10px;
    }

    .dimension-card p {
        font-size: 12px;
        margin-bottom: 12px;
        line-height: 1.6;
    }

    .dimension-traits {
        font-size: 11px;
    }

    .dimension-traits li {
        margin-bottom: 5px;
    }

    .scientific {
        padding: 40px 0;
    }

    .scientific h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }

    .research-item {
        padding: 20px;
    }

    .research-item h4 {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .research-item p {
        font-size: 12px;
        line-height: 1.6;
    }

    .research-citation {
        font-size: 10px;
    }

    .features {
        padding: 40px 0;
    }

    .features h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }

    .feature-card {
        padding: 20px;
    }

    .feature-card h3 {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .feature-card p {
        font-size: 12px;
        line-height: 1.6;
    }

    .how-it-works {
        padding: 40px 0;
    }

    .how-it-works h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }

    .steps {
        gap: 10px;
    }

    .step {
        padding: 18px;
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 18px;
        margin-bottom: 10px;
    }

    .step h4 {
        font-size: 14px;
        margin-bottom: 8px;
    }

    .step p {
        font-size: 11px;
        line-height: 1.5;
    }

    .testimonials {
        padding: 40px 0;
    }

    .testimonials h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }

    .testimonial-card {
        padding: 20px;
    }

    .testimonial-card .quote {
        font-size: 12px;
        line-height: 1.6;
        margin-bottom: 10px;
    }

    .testimonial-card .author {
        font-size: 11px;
    }

    .faq {
        padding: 40px 0;
    }

    .faq h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }

    .faq-item {
        padding: 18px;
    }

    .faq-item h4 {
        font-size: 13px;
        margin-bottom: 8px;
    }

    .faq-item p {
        font-size: 12px;
        line-height: 1.6;
    }

    .final-cta {
        padding: 40px 0;
    }

    .final-cta h2 {
        font-size: 20px;
        margin-bottom: 10px;
        line-height: 1.3;
    }

    .final-cta p {
        font-size: 13px;
        margin-bottom: 15px;
        line-height: 1.5;
    }

    .large-cta {
        padding: 10px 20px;
        font-size: 13px;
        width: 100%;
        margin-bottom: 12px;
    }

    .cta-note {
        font-size: 11px;
    }

    .footer {
        padding: 40px 0 15px;
    }

    .footer-section h4 {
        font-size: 13px;
        margin-bottom: 10px;
    }

    .footer-section p {
        font-size: 12px;
        line-height: 1.6;
    }

    .footer-section ul li {
        margin-bottom: 6px;
    }

    .footer-section a {
        font-size: 12px;
    }

    .footer-bottom p {
        font-size: 10px;
    }
}