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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --dark-color: #2d3748;
    --light-color: #f7fafc;
    --text-color: #2d3748;
    --text-light: #718096;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-medium: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

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

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

/* Utility Classes */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-highlight {
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 900;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-size: 16px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

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

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

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 15px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-light);
}

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

.nav-logo {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
    margin-top: -4px;
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-menu.active {
    display: flex;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background: var(--gradient-primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

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

.nav-hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: var(--transition);
}

.nav-hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-hamburger.active span:nth-child(2) {
    opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
    min-height: 85vh;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 0.7;
    margin-bottom: 24px;
    color: var(--white);
}

.hero-title-main {
    display: block;
    margin-top: -8px;
    font-size: 46px;
}

.hero-line-1,
.hero-line-2,
.hero-line-3 {
    display: block;
    opacity: 0;
}

.hero-description {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.floating-cards {
    position: relative;
    height: 500px;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--white);
    font-weight: 600;
    animation: floatCards 6s ease-in-out infinite;
}

.floating-card i {
    font-size: 32px;
    margin-bottom: 8px;
}

.card-1 {
    top: 20px;
    left: 20px;
    animation-delay: 0s;
}

.card-2 {
    top: 120px;
    right: 40px;
    animation-delay: -1.5s;
}

.card-3 {
    bottom: 120px;
    left: 60px;
    animation-delay: -3s;
}

.card-4 {
    bottom: 20px;
    right: 20px;
    animation-delay: -4.5s;
}

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

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-color);
}

.section-description {
    font-size: 20px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Services Section */
.services {
    padding: 120px 0;
    background: var(--light-color);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.service-card {
    background: var(--white);
    padding: 40px 32px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

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

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--white);
    font-size: 32px;
}

.service-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-color);
}

.service-card p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.6;
}

.service-card ul {
    list-style: none;
}

.service-card li {
    color: var(--text-light);
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
}

.service-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* About Section */
.about {
    padding: 120px 0;
    background: var(--white);
}

.about-header {
    text-align: center;
    margin-bottom: 60px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.slogan {
    background: var(--gradient-primary);
    padding: 32px;
    border-radius: 20px;
    margin-bottom: 30px;
    color: var(--white);
    text-align: center;
}

.slogan h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 0;
}

.about-text p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-color);
    margin: 0;
}

.slogan-desc {
    font-size: 16px;
    opacity: 0.9;
    font-style: italic;
}

.stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

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

.tech-stack {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tech-item {
    background: var(--light-color);
    padding: 24px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
}

.tech-item:hover {
    transform: translateY(-4px);
    background: var(--white);
    box-shadow: var(--shadow-medium);
}

.tech-item i {
    font-size: 32px;
    color: var(--primary-color);
}

.tech-item span {
    font-weight: 600;
    color: var(--text-color);
}

/* Team Section */
.team {
    padding: 120px 0;
    background: var(--light-color);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    justify-items: center;
}

.team-member {
    background: var(--white);
    padding: 40px 24px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: var(--transition);
    max-width: 300px;
    width: 100%;
}

.team-member:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
}

.member-avatar {
    width: 80px;
    height: 80px;
    background: var(--gradient-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--white);
    font-size: 28px;
}

.team-member h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-color);
}

.member-role {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 16px;
}

.member-desc {
    color: var(--text-light);
    line-height: 1.6;
}

/* Contact Section */
.contact {
    padding: 120px 0;
    background: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-details {
    margin: 40px 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-item i {
    font-size: 24px;
    color: var(--primary-color);
    margin-top: 4px;
}

.contact-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

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

.social-links {
    display: flex;
    gap: 16px;
    margin-top: 32px;
}

.social-link {
    width: 48px;
    height: 48px;
    background: var(--light-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    font-size: 20px;
    transition: var(--transition);
    text-decoration: none;
}

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

.contact-form {
    background: var(--light-color);
    padding: 40px;
    border-radius: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    background: var(--white);
    font-family: inherit;
    font-size: 16px;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
    margin-bottom: 24px;
}

/* Footer */
.footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 80px 0 32px;
}

.footer-content {
    display: flex;
    justify-content: center;
    margin-bottom: 60px;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-brand {
    text-align: center;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-column h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--white);
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 12px;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--white);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 32px;
    text-align: center;
}

.footer-bottom-links {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-top: 16px;
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Additional Styles for JavaScript Features */

/* Notification System */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    z-index: 10000;
    max-width: 400px;
    animation: slideInRight 0.3s ease-out;
}

.notification-success {
    border-left: 4px solid #10b981;
}

.notification-error {
    border-left: 4px solid #ef4444;
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.notification-success .notification-content i {
    color: #10b981;
}

.notification-error .notification-content i {
    color: #ef4444;
}

.notification-close {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: var(--transition);
}

.notification-close:hover {
    color: var(--text-color);
    background: var(--light-color);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Scroll Progress Indicator */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(0, 0, 0, 0.1);
    z-index: 9999;
}

.scroll-progress {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width 0.1s ease;
}

/* Floating Contact Button */
.floating-contact-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
    text-decoration: none;
    box-shadow: var(--shadow-heavy);
    z-index: 1000;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(100px);
}

.floating-contact-btn.show {
    opacity: 1;
    transform: translateY(0);
}

.floating-contact-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3);
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--dark-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10000;
    transition: var(--transition);
}

.skip-link:focus {
    top: 6px;
}

/* Animation Classes */
.animate-in {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* Mobile Menu Styles */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 78px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 78px);
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 50px;
        gap: 30px;
        transition: var(--transition);
    }

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

    .nav-hamburger {
        display: flex;
    }

    .hero {
        min-height: 75vh;
    }

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

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

    .hero-content {
        text-align: center;
    }

    .floating-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .floating-card {
        width: 120px;
        height: 80px;
        font-size: 0.8rem;
        padding: 8px;
    }
    
    .floating-card i {
        font-size: 1.2rem;
    }

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

    .about-header {
        text-align: center;
    }

    .about-content,
    .contact-content {
        flex-direction: column;
        gap: 30px;
    }

    .about-text {
        text-align: center;
    }

    .about-visual {
        justify-content: center;
    }

    .stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-row {
        flex-direction: column;
    }

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

    .footer-bottom {
        flex-direction: column;
    }

    .tech-stack {
        grid-template-columns: repeat(3, 1fr);
    }

    .notification {
        right: 10px;
        left: 10px;
        width: auto;
    }

    .floating-contact-btn {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: 70vh;
    }

    .hero-title {
        font-size: 2rem;
        line-height: 0.7;
    }

    .hero-title-main {
        font-size: 1.6rem;
    }

    .hero-description {
        font-size: 0.9rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .floating-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    
    .floating-card {
        width: 100px;
        height: 70px;
        font-size: 0.7rem;
        padding: 6px;
    }
    
    .floating-card i {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .about-header {
        text-align: center;
    }

    .slogan h3 {
        font-size: 1.3rem;
    }

    .about-text p {
        font-size: 0.9rem;
    }

    .services-grid,
    .team-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header,
.service-card,
.team-member {
    animation: fadeInUp 0.6s ease-out;
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
    .service-card:nth-child(1) { animation-delay: 0.1s; }
    .service-card:nth-child(2) { animation-delay: 0.2s; }
    .service-card:nth-child(3) { animation-delay: 0.3s; }
    .service-card:nth-child(4) { animation-delay: 0.4s; }
    
    .team-member:nth-child(1) { animation-delay: 0.1s; }
    .team-member:nth-child(2) { animation-delay: 0.2s; }
    .team-member:nth-child(3) { animation-delay: 0.3s; }
    .team-member:nth-child(4) { animation-delay: 0.4s; }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Dark theme support (optional) */
.dark-theme {
    --white: #1a202c;
    --light-color: #2d3748;
    --text-color: #e2e8f0;
    --text-light: #a0aec0;
    --dark-color: #f7fafc;
}

.dark-theme .navbar {
    background: rgba(26, 32, 44, 0.95);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.dark-theme .service-card,
.dark-theme .team-member,
.dark-theme .contact-form,
.dark-theme .tech-item {
    background: var(--light-color);
}

.dark-theme .footer {
    background: var(--white);
    color: var(--text-color);
}

/* Print styles */
@media print {
    .navbar,
    .floating-contact-btn,
    .scroll-indicator,
    .notification {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        page-break-after: always;
    }
    
    .service-card,
    .team-member {
        page-break-inside: avoid;
    }
}