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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #1e293b;
    background-color: #ffffff;
    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, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(226, 232, 240, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: #0891b2;
    text-decoration: none;
}

.nav-logo i {
    margin-right: 0.5rem;
    font-size: 1.8rem;
    color: #0891b2;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: #475569;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover {
    color: #0891b2;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: #0891b2;
    font-weight: 600;
}

.nav-link.active::after {
    width: 100%;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #475569;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f0fdfa 0%, #ccfbf1 50%, #99f6e4 100%);
    position: relative;
    overflow: hidden;
    padding-top: 80px;
    z-index: 1;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(37,99,235,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    background: linear-gradient(135deg, #1e293b 0%, #0891b2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #64748b;
    margin-bottom: 2.5rem;
    line-height: 1.6;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.cta-button.primary {
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    color: white;
    box-shadow: 0 10px 25px rgba(8, 145, 178, 0.3);
}

.cta-button.secondary {
    background: transparent;
    color: #0891b2;
    border: 2px solid #0891b2;
}

.cta-button:hover {
    transform: translateY(-3px);
}

.cta-button.primary:hover {
    box-shadow: 0 15px 35px rgba(8, 145, 178, 0.4);
}

.cta-button.secondary:hover {
    background: #0891b2;
    color: white;
}

.cta-button i {
    transition: transform 0.3s ease;
}

.cta-button:hover i {
    transform: translateX(5px);
}

.hero-stats {
    display: flex;
    gap: 2rem;
}

.hero-stats .stat {
    text-align: center;
}

.hero-stats .stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: #0891b2;
    margin-bottom: 0.25rem;
}

.hero-stats .stat-label {
    font-size: 0.875rem;
    color: #64748b;
    font-weight: 500;
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-main-image {
    width: 100%;
    max-width: 500px;
    height: 400px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(8, 145, 178, 0.3);
    transition: transform 0.3s ease;
}

.hero-main-image:hover {
    transform: scale(1.05);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.8) 0%, rgba(14, 116, 144, 0.8) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.hero-image:hover .hero-overlay {
    opacity: 1;
}

.hero-graphic {
    width: 100%;
    max-width: 500px;
    height: 400px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    box-shadow: 0 20px 40px rgba(8, 145, 178, 0.3);
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.hero-graphic::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-graphic i {
    font-size: 5rem;
    margin-bottom: 1rem;
    z-index: 2;
    position: relative;
}

.hero-graphic h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    z-index: 2;
    position: relative;
}

.hero-graphic p {
    font-size: 1rem;
    line-height: 1.4;
    max-width: 350px;
    z-index: 2;
    position: relative;
    opacity: 0.9;
}

.hero-graphic:hover {
    transform: scale(1.05);
}

.hero-floating-card {
    position: absolute;
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: #1e293b;
    animation: float 6s ease-in-out infinite;
    z-index: 3;
}

.hero-floating-card:nth-child(2) {
    top: 10%;
    left: -10%;
    animation-delay: -2s;
    z-index: 4;
}

.hero-floating-card:nth-child(3) {
    bottom: 10%;
    right: -10%;
    animation-delay: -4s;
    z-index: 4;
}

.hero-floating-card i {
    color: #0891b2;
    font-size: 1.2rem;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border: 2px solid #0891b2;
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #1e293b 0%, #0891b2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* About Section */
.about {
    padding: 6rem 0;
    background: #ffffff;
    position: relative;
    z-index: 2;
}

/* Hero Image Section */
.about-hero {
    margin-bottom: 4rem;
}

.about-hero-image {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    border-radius: 25px;
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(8, 145, 178, 0.2);
}

.about-main-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.about-main-image:hover {
    transform: scale(1.02);
}

.about-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.8) 0%, rgba(14, 116, 144, 0.8) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.about-hero-image:hover .about-hero-overlay {
    opacity: 1;
}

.about-hero-content {
    text-align: center;
    color: white;
    padding: 2rem;
}

.about-hero-content i {
    font-size: 4rem;
    margin-bottom: 1rem;
    display: block;
}

.about-hero-content h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.about-hero-content p {
    font-size: 1.1rem;
    line-height: 1.5;
    max-width: 500px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Cards Grid Section */
.about-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.about-card {
    background: #f8fafc;
    padding: 2.5rem;
    border-radius: 20px;
    border-left: 4px solid #0891b2;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.card-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.card-icon i {
    font-size: 2rem;
    color: white;
}

.about-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1rem;
}

.about-card p {
    color: #64748b;
    line-height: 1.7;
    font-size: 1rem;
}

.experience-badge {
    position: absolute;
    bottom: -20px;
    right: 20px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(8, 145, 178, 0.3);
}

.experience-badge .years {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.experience-badge .text {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Research Section - Timeline Layout */
.research {
    padding: 6rem 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    z-index: 2;
}

.research-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 0;
}

.research-timeline::before {
    content: '';
    position: absolute;
    left: 50px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, #0891b2 0%, #0e7490 50%, #0891b2 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    display: flex;
    align-items: flex-start;
}

.timeline-marker {
    position: relative;
    flex-shrink: 0;
    width: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.marker-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 25px rgba(8, 145, 178, 0.3);
    z-index: 2;
    position: relative;
}

.marker-icon i {
    font-size: 1.5rem;
    color: white;
}

.marker-line {
    width: 3px;
    height: 60px;
    background: linear-gradient(180deg, #0891b2 0%, #0e7490 100%);
    margin-top: 10px;
}

.timeline-item:last-child .marker-line {
    display: none;
}

.timeline-content {
    flex: 1;
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-left: 2rem;
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.timeline-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0;
}

.timeline-phase {
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.timeline-content p {
    color: #64748b;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.timeline-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: 10px;
    transition: background-color 0.3s ease;
}

.feature-item:hover {
    background: #e2e8f0;
}

.feature-item i {
    color: #0891b2;
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

.feature-item span {
    color: #475569;
    font-size: 0.9rem;
    font-weight: 500;
}

/* AI System Section */
.system {
    padding: 6rem 0;
    background: #ffffff;
    position: relative;
    z-index: 2;
}

.system-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.system-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.system-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.system-card:hover::before {
    transform: scaleX(1);
}

.system-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.system-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.system-graphic {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    transition: transform 0.3s ease;
}

.system-graphic i {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.system-graphic span {
    font-size: 0.9rem;
    font-weight: 600;
}

.system-card:hover .system-graphic {
    transform: scale(1.05);
}

.system-content {
    padding: 2rem;
}

.system-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.system-card:hover .system-icon {
    transform: scale(1.1);
}

.system-icon i {
    font-size: 1.5rem;
    color: white;
}

.system-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1rem;
}

.system-content p {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.system-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.tag {
    background: #e0f2fe;
    color: #0891b2;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.system-stats {
    display: flex;
    gap: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #e2e8f0;
}

.system-stats .stat {
    text-align: center;
}

.system-stats .number {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: #0891b2;
    margin-bottom: 0.25rem;
}

.system-stats .label {
    font-size: 0.875rem;
    color: #64748b;
    font-weight: 500;
}

/* Annotation Platform Section - Showcase Layout */
.annotation {
    padding: 6rem 0;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    position: relative;
    z-index: 2;
}

.annotation-showcase {
    max-width: 1200px;
    margin: 0 auto;
}

.annotation-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 4rem;
    padding: 3rem;
    background: white;
    border-radius: 25px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.annotation-hero-content {
    text-align: left;
}

.annotation-hero-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
}

.annotation-hero-icon i {
    font-size: 2.5rem;
    color: white;
}

.annotation-hero-content h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.annotation-hero-content p {
    font-size: 1.1rem;
    color: #64748b;
    line-height: 1.7;
}

.annotation-hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.platform-preview {
    width: 100%;
    max-width: 400px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.preview-header {
    background: #1e293b;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.preview-dots {
    display: flex;
    gap: 0.5rem;
}

.preview-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #64748b;
}

.preview-dots span:nth-child(1) {
    background: #ef4444;
}

.preview-dots span:nth-child(2) {
    background: #f59e0b;
}

.preview-dots span:nth-child(3) {
    background: #10b981;
}

.preview-title {
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
}

.preview-content {
    padding: 2rem;
}

.preview-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: 10px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.preview-item:hover {
    transform: translateX(5px);
}

.preview-item i {
    color: #0891b2;
    font-size: 1.25rem;
    width: 30px;
    text-align: center;
}

.preview-item span {
    color: #1e293b;
    font-weight: 500;
}

.annotation-features {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.feature-column {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature-item {
    display: flex;
    gap: 1.5rem;
    padding: 2rem;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-content h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1rem;
}

.feature-content p {
    color: #64748b;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.feature-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.feature-tags .tag {
    background: #f1f5f9;
    color: #475569;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.feature-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.stat-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.stat-icon i {
    font-size: 1.5rem;
    color: white;
}

.stat-content h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.stat-content p {
    color: #64748b;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Team Section */
.team {
    padding: 6rem 0;
    background: #f8fafc;
    position: relative;
    z-index: 2;
}

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

.team-member {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.team-member:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.member-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.member-graphic {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    transition: transform 0.3s ease;
}

.member-graphic i {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.member-graphic span {
    font-size: 0.8rem;
    font-weight: 600;
    max-width: 120px;
    line-height: 1.2;
}

.team-member:hover .member-graphic {
    transform: scale(1.05);
}

.member-info {
    padding: 2rem;
    text-align: center;
}

.member-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.member-info .position {
    color: #0891b2;
    font-weight: 600;
    margin-bottom: 1rem;
}

.member-info .bio {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #f1f5f9;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #0891b2;
    color: white;
    transform: translateY(-3px);
}

/* Contact Section */
.contact {
    padding: 6rem 0;
    background: #ffffff;
    position: relative;
    z-index: 2;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 20px;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: transform 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.25rem;
    color: white;
}

.contact-details h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.contact-details p {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 0.25rem;
}

.contact-form {
    background: #f8fafc;
    padding: 2.5rem;
    border-radius: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #1e293b;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #0891b2;
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    justify-content: center;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(8, 145, 178, 0.3);
}

.submit-btn i {
    transition: transform 0.3s ease;
}

.submit-btn:hover i {
    transform: translateX(5px);
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.footer-logo i {
    margin-right: 0.5rem;
    color: #0891b2;
}

.footer-section p {
    color: #cbd5e1;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
}

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

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

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #0891b2;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icon {
    width: 40px;
    height: 40px;
    background: #334155;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-icon:hover {
    background: #0891b2;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #334155;
    color: #cbd5e1;
    font-size: 0.9rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

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

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-hero-image {
        max-width: 100%;
    }
    
    .about-hero-content i {
        font-size: 3rem;
    }
    
    .about-hero-content h3 {
        font-size: 1.5rem;
    }
    
    .about-hero-content p {
        font-size: 1rem;
        max-width: 100%;
    }
    
    .about-cards-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .about-card {
        padding: 2rem;
    }
    
    .card-icon {
        width: 70px;
        height: 70px;
    }
    
    .card-icon i {
        font-size: 1.75rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .research-timeline {
        padding: 1rem 0;
    }
    
    .research-timeline::before {
        left: 30px;
    }
    
    .timeline-marker {
        width: 60px;
    }
    
    .marker-icon {
        width: 50px;
        height: 50px;
    }
    
    .marker-icon i {
        font-size: 1.25rem;
    }
    
    .timeline-content {
        margin-left: 1rem;
        padding: 1.5rem;
    }
    
    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .timeline-header h3 {
        font-size: 1.25rem;
    }
    
    .timeline-features {
        grid-template-columns: 1fr;
    }
    
    .annotation-hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem;
    }
    
    .annotation-hero-content h3 {
        font-size: 2rem;
    }
    
    .annotation-features {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .feature-item {
        padding: 1.5rem;
    }
    
    .feature-stats {
        flex-direction: row;
        gap: 1rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-floating-card {
        display: none;
    }
    
    .hero-main-image {
        max-width: 100%;
        height: 300px;
    }
    
    .about-main-image {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .research-card,
    .system-card,
    .annotation-card,
    .team-member {
        margin: 0 1rem;
    }

    .contact-form {
        padding: 1.5rem;
    }

    .cta-button {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Smooth scrolling for older browsers */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Loading animation */
.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.loading.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #0891b2;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0e7490;
}