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

/* CSS Variables는 design-tokens.css에서 정의됨 */

body {
    font-family: var(--semantic-font-family-primary);
    font-size: var(--semantic-typography-body-1-normal-font-size);
    line-height: var(--semantic-typography-body-1-normal-line-height);
    font-weight: var(--semantic-typography-body-1-normal-font-weight);
    letter-spacing: var(--semantic-typography-body-1-normal-letter-spacing);
    color: var(--semantic-color-text-primary);
    overflow-x: hidden;
    background: var(--semantic-color-background-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--semantic-sizing-padding-8);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--semantic-font-family-primary);
    color: var(--semantic-color-text-primary);
    margin: 0 0 1rem 0;
}

/* Hero 타이틀 - Display 1 */
h1 {
    font-size: clamp(var(--semantic-typography-title-1-font-size), 5vw, var(--semantic-typography-display-1-font-size));
    line-height: clamp(var(--semantic-typography-title-1-line-height), 1.3, var(--semantic-typography-display-1-line-height));
    font-weight: var(--semantic-typography-display-1-font-weight);
    letter-spacing: var(--semantic-typography-display-1-letter-spacing);
}

/* 섹션 제목 - Title 2 */
h2 {
    font-size: clamp(var(--semantic-typography-title-3-font-size), 4vw, var(--semantic-typography-title-2-font-size));
    line-height: var(--semantic-typography-title-2-line-height);
    font-weight: var(--semantic-typography-title-2-font-weight);
    letter-spacing: var(--semantic-typography-title-2-letter-spacing);
    margin-bottom: var(--semantic-sizing-gap-5);
    text-align: center;
}

/* 서브제목 - Title 3 */
h3 {
    font-size: var(--semantic-typography-title-3-font-size);
    line-height: var(--semantic-typography-title-3-line-height);
    font-weight: var(--semantic-typography-title-3-font-weight);
    letter-spacing: var(--semantic-typography-title-3-letter-spacing);
    margin-bottom: var(--semantic-sizing-gap-4);
}

p {
    font-size: var(--semantic-typography-body-1-reading-font-size);
    line-height: var(--semantic-typography-body-1-reading-line-height);
    font-weight: var(--semantic-typography-body-1-reading-font-weight);
    letter-spacing: var(--semantic-typography-body-1-reading-letter-spacing);
    color: var(--semantic-color-text-secondary);
    margin-bottom: var(--semantic-sizing-gap-4);
}

.section-subtitle {
    font-size: var(--semantic-typography-headline-1-font-size);
    line-height: var(--semantic-typography-headline-1-line-height);
    font-weight: var(--semantic-typography-headline-1-font-weight);
    letter-spacing: var(--semantic-typography-headline-1-letter-spacing);
    color: var(--semantic-color-text-tertiary);
    text-align: center;
    margin-bottom: var(--semantic-sizing-gap-8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--semantic-sizing-gap-3);
    padding: var(--semantic-sizing-padding-4) var(--semantic-sizing-padding-8);
    border: none;
    border-radius: var(--semantic-sizing-radius-lg);
    text-decoration: none;
    font-family: var(--semantic-font-family-primary);
    font-size: var(--semantic-typography-label-1-normal-font-size);
    line-height: var(--semantic-typography-label-1-normal-line-height);
    font-weight: var(--semantic-typography-label-1-normal-font-weight);
    letter-spacing: var(--semantic-typography-label-1-normal-letter-spacing);
    transition: all 0.3s ease;
    cursor: pointer;
    white-space: nowrap;
}

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

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

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    max-width: 700px;
    width: auto;
    background: rgba(45, 45, 45, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 60px;
    z-index: 1000;
    padding: 16px 32px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.navbar.minimized {
    max-width: 80px;
    padding: 16px;
}

.navbar.minimized:hover {
    max-width: 800px;
    padding: 16px 40px;
}

.nav-container {
    display: flex;
    align-items: center;
    gap: 40px;
    transition: gap 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar.minimized .nav-container {
    gap: 0;
}

.navbar.minimized:hover .nav-container {
    gap: 40px;
}

.logo {
    width: 48px;
    height: 48px;
    background: var(--semantic-color-background-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--semantic-typography-headline-1-font-size);
    line-height: var(--semantic-typography-headline-1-line-height);
    font-weight: var(--semantic-typography-heading-1-font-weight);
    letter-spacing: var(--semantic-typography-headline-1-letter-spacing);
    color: var(--semantic-color-text-primary);
    text-decoration: none;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 28px;
    align-items: center;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 1;
    visibility: visible;
    white-space: nowrap;
}

.navbar.minimized .nav-menu {
    opacity: 0;
    visibility: hidden;
    width: 0;
    overflow: hidden;
}

.navbar.minimized:hover .nav-menu {
    opacity: 1;
    visibility: visible;
    width: auto;
}

.nav-menu a {
    text-decoration: none;
    font-size: var(--semantic-typography-body-1-normal-font-size);
    line-height: var(--semantic-typography-body-1-normal-line-height);
    font-weight: var(--semantic-typography-body-1-normal-font-weight);
    letter-spacing: var(--semantic-typography-body-1-normal-letter-spacing);
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 8px 0;
}

.nav-menu a[href="#contact"] {
    background: white;
    color: #2d2d2d;
    padding: 12px 24px;
    border-radius: 24px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 90px;
    text-align: center;
}

.nav-menu a:hover {
    color: white;
}

.nav-menu a[href="#contact"]:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.nav-menu a.active {
    color: white;
}

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

.hamburger span {
    width: var(--semantic-sizing-height-4);
    height: var(--foundation-number-2);
    background: rgba(255, 255, 255, 0.8);
    margin: var(--foundation-number-2) 0;
    transition: 0.3s;
    border-radius: 1px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #fafbfc 0%, #f1f3f4 100%);
    padding: 140px 0 80px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--semantic-sizing-padding-3) var(--semantic-sizing-padding-6);
    background: var(--semantic-color-background-primary);
    border: 1px solid var(--semantic-color-border-normal);
    border-radius: var(--foundation-number-max);
    font-size: 0.9rem;
    color: var(--semantic-color-text-secondary);
    margin-bottom: 2rem;
    animation: slideInUp 0.8s ease-out;
}

.hero-content h1 {
    margin-bottom: 1.5rem;
    animation: slideInUp 0.8s ease-out 0.2s both;
}

.highlight {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--semantic-color-text-tertiary);
    margin-bottom: 2.5rem;
    line-height: 1.7;
    animation: slideInUp 0.8s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--semantic-sizing-gap-5);
    justify-content: center;
    margin-bottom: 4rem;
    animation: slideInUp 0.8s ease-out 0.6s both;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--semantic-sizing-gap-8);
    max-width: 500px;
    margin: 0 auto;
    animation: slideInUp 0.8s ease-out 0.8s both;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--semantic-color-text-tertiary);
}

/* Services Section */
.services {
    padding: 100px 0;
    background: var(--semantic-color-background-primary);
}

.services-grid {
    display: grid;
    gap: var(--semantic-sizing-gap-8);
}

.service-card {
    display: flex;
    gap: var(--semantic-sizing-gap-8);
    padding: 2.5rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

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

.service-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 40px;
}

.service-content h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.375rem;
}

.service-content p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.tag {
    background: var(--semantic-color-background-primary);
    color: var(--semantic-color-text-secondary);
    padding: var(--semantic-sizing-padding-2) var(--semantic-sizing-padding-5);
    border-radius: var(--semantic-sizing-radius-xl);
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--semantic-color-border-normal);
}

.service-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s ease;
}

.service-link:hover {
    gap: var(--semantic-sizing-gap-5);
}

/* Process Section */
.process {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--semantic-sizing-gap-8);
}

.process-step {
    text-align: center;
    padding: var(--semantic-sizing-padding-9);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: white;
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.process-step h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.process-step p {
    color: var(--semantic-color-text-secondary);
    line-height: 1.7;
}

/* Projects Section */
.projects {
    padding: 100px 0;
    background: var(--semantic-color-background-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--semantic-sizing-gap-8);
}

.project-card {
    background: var(--semantic-color-background-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

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

.project-card.featured {
    grid-column: span 2;
}

.project-image {
    height: 250px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.placeholder-project {
    color: var(--text-muted);
    font-size: 4rem;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-view {
    color: white;
    text-decoration: none;
    font-weight: 600;
    padding: var(--semantic-sizing-padding-5) var(--semantic-sizing-padding-8);
    border: 2px solid white;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.project-view:hover {
    background: white;
    color: var(--text-dark);
}

.project-info {
    padding: var(--semantic-sizing-padding-9);
}

.project-meta {
    display: flex;
    gap: var(--semantic-sizing-gap-5);
    margin-bottom: 1rem;
}

.project-year,
.project-type {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.project-info h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.375rem;
}

.project-info p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

/* Testimonials Section */
.testimonials {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--semantic-sizing-gap-8);
}

.testimonial-card {
    background: var(--semantic-color-background-primary);
    padding: var(--semantic-sizing-padding-9);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

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

.testimonial-content p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--semantic-color-text-secondary);
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial-author h4 {
    color: var(--text-dark);
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

.testimonial-author span {
    color: var(--semantic-color-text-tertiary);
    font-size: 0.9rem;
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: var(--semantic-color-background-primary);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-content h2 {
    margin-bottom: 1rem;
}

.contact-description {
    font-size: 1.125rem;
    color: var(--semantic-color-text-tertiary);
    margin-bottom: 3rem;
}

.contact-methods {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--semantic-color-text-secondary);
    transition: all 0.3s ease;
}

.contact-method:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.contact-method.primary {
    background: var(--gradient);
    color: white;
    border-color: transparent;
}

.contact-method.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    background: var(--bg-secondary);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    text-align: left;
}

.contact-form h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--semantic-sizing-gap-5);
}

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--semantic-sizing-padding-4) var(--semantic-sizing-padding-6);
    border: 1px solid var(--semantic-color-border-normal);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background: var(--semantic-color-background-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.form-group button {
    width: 100%;
    justify-content: center;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

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

.footer p {
    color: var(--text-muted);
    margin: 0;
}

.social-links {
    display: flex;
    gap: var(--semantic-sizing-gap-5);
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--primary-color);
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Scroll behavior */
html {
    scroll-behavior: smooth;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .navbar {
        top: 16px;
        width: auto;
        max-width: calc(100% - 32px);
        padding: 12px 24px;
    }

    .navbar.minimized {
        max-width: 64px;
        padding: 12px;
    }

    .navbar.minimized:hover {
        max-width: calc(100% - 20px);
        padding: 12px 32px;
    }

    .hamburger {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: fixed;
        top: 90px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 32px);
        max-width: 400px;
        background: rgba(45, 45, 45, 0.95);
        backdrop-filter: blur(20px);
        border-radius: 24px;
        flex-direction: column;
        align-items: center;
        padding: 24px;
        gap: 16px;
        transition: all 0.3s ease;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    }

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

    .nav-menu li {
        margin: 0;
        width: 100%;
        text-align: center;
    }

    .nav-menu a {
        padding: 12px 24px;
        width: 100%;
        text-align: center;
    }

    .nav-menu a[href="#contact"] {
        margin-top: 8px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

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

    .service-card {
        flex-direction: column;
        gap: var(--semantic-sizing-gap-5);
    }

    .service-card.featured,
    .project-card.featured {
        grid-column: span 1;
    }

    .process-steps {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .contact-methods {
        flex-direction: column;
        align-items: center;
    }

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

    .contact-form {
        padding: var(--semantic-sizing-padding-9);
    }

    .footer .container {
        flex-direction: column;
        gap: var(--semantic-sizing-gap-5);
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
}

@media (max-width: 480px) {
    .hero-description {
        font-size: 1rem;
    }

    .service-card,
    .contact-form {
        padding: 1.5rem;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--gradient);
    color: white;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Loading states */
.loading {
    animation: pulse 2s ease-in-out infinite alternate;
}

@keyframes pulse {
    from {
        opacity: 0.6;
    }
    to {
        opacity: 1;
    }
}

/* Focus states for accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}