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

:root {
    --primary-color: #0071e3;
    --secondary-color: #1d1d1f;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-dark: #000000;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 400;
    transition: opacity 0.3s ease;
}

.nav-menu a:hover {
    opacity: 0.7;
}

/* Hero Section */
.hero {
    margin-top: 48px;
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 20px 80px;
    background: linear-gradient(180deg, #f5f5f7 0%, #ffffff 100%);
}

.hero-content {
    max-width: 900px;
    margin-bottom: 60px;
}

.diploma-label {
    text-transform: uppercase;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.015em;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.authors {
    margin-top: 30px;
    font-size: 16px;
    color: var(--text-secondary);
}

.authors p {
    margin: 5px 0;
}

.hero-subtitle {
    font-size: clamp(21px, 3vw, 28px);
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 40px;
    line-height: 1.4;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 28px;
    border: none;
    border-radius: 980px;
    font-size: 17px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #0077ed;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 113, 227, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 40px;
    font-size: 19px;
}

.hero-image {
    width: 100%;
    max-width: 1000px;
    perspective: 1000px;
}

.dashboard-preview {
    width: 100%;
    min-height: 400px;
    max-height: 700px;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
    animation: float 6s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dashboard-preview img {
    width: 100%;
    height: auto;
    object-fit: contain;
    display: block;
    position: relative;
    z-index: 1;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotateX(0deg);
    }
    50% {
        transform: translateY(-20px) rotateX(2deg);
    }
}

/* Problem Section */
.problem-section {
    padding: 120px 20px;
    background: var(--bg-primary);
}

.section-title {
    font-size: clamp(40px, 6vw, 56px);
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.section-description {
    font-size: clamp(19px, 2.5vw, 24px);
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
    line-height: 1.5;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.problem-card {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.problem-number {
    width: 60px;
    height: 60px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.problem-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    font-weight: 600;
}

.problem-card p {
    color: var(--text-secondary);
    font-size: 17px;
    line-height: 1.5;
}

/* Solution Section */
.solution-section {
    padding: 120px 20px;
    background: var(--bg-dark);
    color: white;
    text-align: center;
}

.solution-section .section-title {
    color: white;
}

.highlight-text {
    font-size: clamp(24px, 4vw, 40px);
    font-weight: 600;
    line-height: 1.3;
    max-width: 900px;
    margin: 0 auto;
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Features Section */
.features-section {
    padding: 120px 20px;
    background: var(--bg-primary);
}

.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 120px;
}

.feature-row.reverse {
    direction: rtl;
}

.feature-row.reverse > * {
    direction: ltr;
}

.feature-content {
    padding: 20px;
}

.feature-number {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
}

.feature-content h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

.feature-content p {
    font-size: 19px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-visual {
    min-height: 400px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
}

.feature-visual img {
    width: 100%;
    height: auto;
    max-height: 600px;
    object-fit: contain;
    display: block;
}

.feature-visual:hover {
    transform: scale(1.02);
}


/* Tech Stack Section */
.tech-section {
    padding: 120px 20px;
    background: var(--bg-secondary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.tech-card {
    background: var(--bg-primary);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.tech-logo {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: transparent;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: 700;
    color: white;
}

.tech-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.tech-card h4 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 10px;
}

.tech-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* Benefits Section */
.benefits-section {
    padding: 120px 20px;
    background: var(--bg-primary);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.benefit-card {
    padding: 40px 30px;
}

.benefit-number {
    font-size: 48px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.benefit-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
}

.benefit-card p {
    color: var(--text-secondary);
    font-size: 17px;
    line-height: 1.5;
}

/* CTA Section */
.cta-section {
    padding: 120px 20px;
    background: var(--bg-dark);
    text-align: center;
    color: white;
}

.cta-title {
    font-size: clamp(40px, 6vw, 56px);
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-subtitle {
    font-size: 24px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
}

/* Team Section */
.team-section {
    padding: 120px 20px;
    background: var(--bg-primary);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    margin-top: 80px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.team-card {
    text-align: center;
    transition: opacity 0.3s ease;
}

.team-card:hover {
    opacity: 0.8;
}

.team-image {
    width: 180px;
    height: 180px;
    margin: 0 auto 24px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--bg-secondary);
    position: relative;
}

.team-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%);
    transition: filter 0.3s ease;
    display: block;
    font-size: 0;
}

.team-image img::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.team-card:hover .team-image img {
    filter: grayscale(0%);
}

.team-name {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.team-responsibility {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.5;
    max-width: 200px;
    margin: 0 auto;
}

/* Responsive Team Section */
@media (max-width: 968px) {
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 50px;
    }
}

@media (max-width: 600px) {
    .team-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .team-image {
        width: 150px;
        height: 150px;
    }
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 60px 20px 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

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

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

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .feature-row {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .feature-row.reverse {
        direction: ltr;
    }
    
    .hero {
        padding: 80px 20px 60px;
    }
    
    .dashboard-preview {
        height: 300px;
    }
    
    .problem-grid,
    .tech-grid,
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

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

/* Selection */
::selection {
    background: var(--primary-color);
    color: white;
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}