/* ========================================
   Swift Support AI - Professional Website
   Colors: #2E3192 (Deep Blue), #00C9A7 (Teal), #FFFFFF (White)
   ======================================== */

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

:root {
    --primary-blue: #2E3192;
    --secondary-teal: #00C9A7;
    --white: #FFFFFF;
    --black: #1a1a1a;
    --gray-light: #f5f7fa;
    --gray-medium: #8892a6;
    --gray-dark: #4a5568;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--black);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 16px;
    line-height: 1.7;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-outline {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: #00b396;
    border-color: #00b396;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: #252880;
    border-color: #252880;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border-color: var(--primary-blue);
}

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

.btn-lg {
    padding: 18px 40px;
    font-size: 1.125rem;
}

.btn-primary i,
.btn-secondary i,
.btn-outline i {
    margin-right: 8px;
}

/* Navigation */
.navbar {
    background: var(--white);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.logo-img {
    height: 48px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    color: var(--gray-dark);
    font-weight: 500;
    position: relative;
}

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

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--secondary-teal);
}

.nav-cta {
    display: flex;
    gap: 16px;
    align-items: center;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 3px;
    background: var(--primary-blue);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #1e2470 100%);
    color: var(--white);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 201, 167, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 201, 167, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 48px;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary-teal);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.hero-cta .btn-outline {
    border-color: var(--white);
    color: var(--white);
}

.hero-cta .btn-outline:hover {
    background: var(--white);
    color: var(--primary-blue);
}

.hero-guarantee {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero-guarantee i {
    color: var(--secondary-teal);
    margin-right: 8px;
}

/* Sections */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 64px;
}

.section-header h2 {
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-dark);
    line-height: 1.7;
}

/* Problem Section */
.problem-section {
    background: var(--gray-light);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.problem-card {
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
}

.problem-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 2rem;
    color: var(--white);
}

.problem-card h3 {
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.problem-card p {
    color: var(--gray-dark);
    line-height: 1.7;
}

.mit-research {
    text-align: center;
}

.research-badge {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    background: var(--white);
    padding: 24px 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.research-badge i {
    font-size: 2rem;
    color: var(--secondary-teal);
}

.research-badge strong {
    color: var(--primary-blue);
}

/* Solution Section */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.solution-card {
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    border: 2px solid transparent;
}

.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-teal);
}

.solution-card.featured {
    border: 2px solid var(--secondary-teal);
    background: linear-gradient(135deg, rgba(0, 201, 167, 0.05), rgba(46, 49, 146, 0.05));
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--secondary-teal);
    color: var(--white);
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.solution-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 2rem;
    color: var(--white);
}

.solution-icon.teal {
    background: linear-gradient(135deg, var(--secondary-teal), #00b396);
}

.solution-icon.gold {
    background: linear-gradient(135deg, #FFD700, #FFA500);
}

.solution-icon.purple {
    background: linear-gradient(135deg, #9333ea, #7c3aed);
}

.solution-card h3 {
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.solution-card p {
    color: var(--gray-dark);
    margin-bottom: 24px;
}

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

.feature-list li {
    padding: 8px 0;
    color: var(--gray-dark);
    display: flex;
    align-items: center;
    gap: 12px;
}

.feature-list i {
    color: var(--secondary-teal);
    font-size: 1.125rem;
}

/* Comparison Section */
.comparison-section {
    background: var(--gray-light);
}

.comparison-table {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.comparison-header,
.comparison-row {
    display: grid;
    grid-template-columns: 2fr 2fr 2fr;
    gap: 16px;
    padding: 24px;
    align-items: center;
}

.comparison-header {
    background: var(--primary-blue);
    color: var(--white);
    font-weight: 600;
    font-size: 1.125rem;
}

.comparison-row {
    border-bottom: 1px solid #e5e7eb;
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row:nth-child(even) {
    background: var(--gray-light);
}

.comparison-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--primary-blue);
}

.comparison-feature i {
    font-size: 1.5rem;
    color: var(--secondary-teal);
}

.comparison-chatbot,
.comparison-delta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.comparison-chatbot i {
    font-size: 1.5rem;
    color: #ef4444;
}

.comparison-delta i {
    font-size: 1.5rem;
    color: var(--secondary-teal);
}

/* Testimonial Section */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.testimonial-card {
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid transparent;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-teal);
}

.testimonial-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 1.5rem;
    color: var(--white);
}

.testimonial-metric {
    font-size: 2rem;
    font-weight: 800;
    color: var(--secondary-teal);
    margin-bottom: 16px;
}

.testimonial-text {
    color: var(--gray-dark);
    line-height: 1.7;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 2px solid var(--gray-light);
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--gray-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 1.25rem;
}

.author-name {
    font-weight: 600;
    color: var(--primary-blue);
}

.author-company {
    font-size: 0.875rem;
    color: var(--gray-medium);
}

/* ROI Section */
.roi-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, #1e2470 100%);
    color: var(--white);
}

.roi-content h2 {
    color: var(--white);
    text-align: center;
    margin-bottom: 16px;
}

.roi-content > p {
    text-align: center;
    font-size: 1.25rem;
    margin-bottom: 48px;
}

.roi-calculation {
    max-width: 800px;
    margin: 0 auto;
}

.roi-step {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
}

.roi-number {
    width: 48px;
    height: 48px;
    background: var(--secondary-teal);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    flex-shrink: 0;
}

.roi-description {
    flex: 1;
}

.roi-description strong {
    color: var(--secondary-teal);
}

.roi-result {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.roi-box {
    background: rgba(255, 255, 255, 0.1);
    padding: 32px;
    border-radius: 12px;
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.roi-box.highlight {
    background: var(--secondary-teal);
    border-color: var(--secondary-teal);
}

.roi-label {
    font-size: 1rem;
    margin-bottom: 12px;
    opacity: 0.9;
}

.roi-value {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.roi-calc {
    font-size: 0.875rem;
    opacity: 0.8;
}

.roi-note {
    text-align: center;
    margin-top: 48px;
    font-size: 1.125rem;
}

.roi-note i {
    color: var(--secondary-teal);
    margin-right: 8px;
}

/* Demo CTA Section */
.demo-cta-section {
    background: var(--gray-light);
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.demo-card {
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
    border: 2px solid transparent;
    cursor: pointer;
}

.demo-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-teal);
}

.demo-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 2rem;
    color: var(--white);
}

.demo-card h3 {
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.demo-card p {
    color: var(--gray-dark);
    margin-bottom: 24px;
}

.demo-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--secondary-teal);
    font-weight: 600;
}

.demo-cta-bottom {
    text-align: center;
}

.demo-cta-bottom > p {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 24px;
}

.cta-subtext {
    margin-top: 16px;
    color: var(--gray-medium);
}

/* Final CTA Section */
.final-cta-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, #1e2470 100%);
    color: var(--white);
    text-align: center;
}

.final-cta-content h2 {
    color: var(--white);
    margin-bottom: 24px;
}

.final-cta-content > p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.final-cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.final-cta-buttons .btn-outline {
    border-color: var(--white);
    color: var(--white);
}

.final-cta-buttons .btn-outline:hover {
    background: var(--white);
    color: var(--primary-blue);
}

.final-cta-trust {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.trust-item i {
    color: var(--secondary-teal);
    font-size: 1.5rem;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: var(--white);
    padding: 64px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-logo img {
    height: 48px;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 24px;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.footer-contact i {
    color: var(--secondary-teal);
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact a:hover {
    color: var(--secondary-teal);
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 24px;
    font-size: 1.125rem;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-col ul li a:hover {
    color: var(--secondary-teal);
}

.footer-social {
    margin-top: 24px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--secondary-teal);
    transform: translateY(-4px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal a:hover {
    color: var(--secondary-teal);
}

/* Responsive Design */
@media (max-width: 992px) {
    .nav-links,
    .nav-cta {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        box-shadow: var(--shadow-md);
        padding: 24px;
        gap: 16px;
    }

    h1 { font-size: 2.25rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .comparison-header,
    .comparison-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .comparison-feature {
        font-size: 1rem;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    .hero {
        padding: 80px 0 60px;
    }

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

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-stats {
        gap: 32px;
    }

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

    .btn-lg {
        padding: 16px 32px;
        font-size: 1rem;
    }

    .problem-grid,
    .solution-grid,
    .demo-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .roi-value {
        font-size: 2.5rem;
    }

    .final-cta-trust {
        flex-direction: column;
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }

    .hero-title {
        font-size: 1.75rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .btn-primary,
    .btn-secondary,
    .btn-outline {
        padding: 12px 24px;
        font-size: 0.875rem;
    }

    .btn-lg {
        padding: 14px 28px;
    }
}