/* ===================================
   CSS Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Sophisticated & Professional */
    --primary-dark: #1a1a1a;
    --primary-gray: #333333;
    --secondary-gray: #666666;
    --light-gray: #f5f5f5;
    --accent-blue: #2c5f8d;
    --accent-gold: #b8956a;
    --white: #ffffff;
    --border-color: #e0e0e0;
    
    /* Typography */
    --font-serif: 'Noto Serif KR', 'Nanum Myeongjo', 'Batang', 'Georgia', 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Layout */
    --max-width: 1000px;
    --border-radius: 4px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--primary-gray);
    background-color: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Language Toggle
   =================================== */

.language-toggle {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-xs);
    z-index: 1000;
    background: var(--white);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--secondary-gray);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.lang-btn.active {
    background: var(--accent-blue);
    color: var(--white);
    border-color: var(--accent-blue);
}

/* ===================================
   Navigation
   =================================== */

.nav {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.2rem;
    color: var(--primary-dark);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-gray);
    font-weight: 500;
    font-size: 1rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--accent-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-blue);
    transition: width var(--transition-normal);
}

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

/* ===================================
   Hero Section
   =================================== */

.hero-section {
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.75) 0%, rgba(51, 51, 51, 0.75) 100%), url('https://storage.googleapis.com/cliffpartners-sites/assets/home_02.jpeg') center top/cover no-repeat;
    color: var(--white);
    padding: calc(var(--spacing-xl) * 2) 0;
    text-align: center;
    margin-bottom: 0;
}

.hero-content {
    display: none;
}

.hero-content[data-lang-en] {
    display: block;
}

.hero-content[data-lang-ko] {
    display: none;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.05rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    animation: fadeInDown 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    letter-spacing: 0.05rem;
    opacity: 0.9;
    line-height: 1.6;
    animation: fadeInUp 0.8s ease;
}

/* ===================================
   About Section
   =================================== */

.about-section {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

/* ===================================
   Services Section
   =================================== */

.services-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.75) 0%, rgba(51, 51, 51, 0.75) 100%), url('https://storage.googleapis.com/cliffpartners-sites/assets/service_02.png') center/cover no-repeat;
}

.services-section .section-title {
    text-align: center;
    display: block;
    border-bottom: none;
    color: var(--white);
    margin-bottom: var(--spacing-xl);
}

.services-section .section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background: var(--accent-gold);
    margin: var(--spacing-md) auto 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.service-item {
    margin-bottom: 0;
    padding: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: none;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-normal);
}

.service-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.service-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: var(--spacing-lg);
}

.service-heading {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: var(--spacing-sm);
}

.service-subtitle {
    font-size: 1rem;
    color: var(--secondary-gray);
    margin-bottom: var(--spacing-md);
}

.service-list {
    list-style: none;
    padding: 0;
}

.service-list li {
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    position: relative;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--primary-gray);
}

.service-list li:last-child {
    margin-bottom: 0;
}

.service-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: bold;
    font-size: 1.5rem;
    line-height: 1.2;
}

/* ===================================
   Contact Section
   =================================== */

.contact-section {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

/* ===================================
   Header (Legacy - can be removed)
   =================================== */

.header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-gray) 100%);
    color: var(--white);
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.company-name {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 0.3rem;
    margin-bottom: var(--spacing-sm);
    animation: fadeInDown 0.8s ease;
}

.tagline {
    font-size: 1.125rem;
    font-weight: 300;
    letter-spacing: 0.1rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease;
}

/* ===================================
   Main Content & Sections
   =================================== */

.main-content {
    /* padding: var(--spacing-lg) 0; */
    min-height: 60vh;
}

.content-section {
    display: none;
}

.content-section[data-lang-en] {
    display: block;
}

.content-section[data-lang-ko] {
    display: none;
}

.nav-brand[data-lang-en],
.nav-link[data-lang-en] {
    display: inline-block;
}

.nav-brand[data-lang-ko],
.nav-link[data-lang-ko] {
    display: none;
}

.section {
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.section:nth-child(1) { animation-delay: 0.1s; }
.section:nth-child(2) { animation-delay: 0.2s; }
.section:nth-child(3) { animation-delay: 0.3s; }
.section:nth-child(4) { animation-delay: 0.4s; }

.section-title {
    font-family: var(--font-serif);
    font-size: 1.875rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent-gold);
    display: inline-block;
}

.section-content {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--primary-gray);
}

.section-content p {
    margin-bottom: var(--spacing-md);
}

.section-content p:last-child {
    margin-bottom: 0;
}

.section-content strong {
    color: var(--accent-blue);
    font-weight: 600;
}

/* ===================================
   Founder Profile
   =================================== */

.founder-profile {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.founder-image {
    flex: 0 0 180px;
}

.founder-image img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.founder-linkedin {
    margin-top: var(--spacing-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.1rem;
    border-radius: 999px;
    background: transparent;
    color: var(--accent-blue);
    border: 1px solid var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.02rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
    box-shadow: none;
}

.founder-linkedin .linkedin-icon {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.founder-linkedin:hover {
    background: rgba(44, 95, 141, 0.08);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(44, 95, 141, 0.18);
}

.founder-text {
    flex: 1;
}

/* ===================================
   Experience Highlights (Special Section)
   =================================== */

.experience-highlights {
    background: var(--light-gray);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-xl);
}

.experience-highlights .section-content {
    margin: 0;
}

.highlights {
    background: var(--light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-blue);
}

.highlights .section-title {
    border-bottom-color: var(--accent-blue);
}

.highlight-list {
    list-style: none;
    padding: 0;
}

.highlight-list li {
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    position: relative;
    font-size: 1.0625rem;
    line-height: 1.7;
}

.highlight-list li:last-child {
    margin-bottom: 0;
}

.highlight-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: bold;
    font-size: 1.25rem;
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-xl);
    text-align: center;
}

.footer-text {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===================================
   Animations
   =================================== */

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablet */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 2.5rem;
    }
    
    .nav .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-brand {
        font-size: 1.25rem;
    }
    
    .nav-menu {
        gap: var(--spacing-md);
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .service-heading {
        font-size: 1.375rem;
    }
    
    .service-list li {
        font-size: 1rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .company-name {
        font-size: 2.25rem;
        letter-spacing: 0.2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .section-content {
        font-size: 1rem;
    }
    
    .highlight-list li {
        font-size: 1rem;
    }
    
    .language-toggle {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    .founder-profile {
        flex-direction: column;
        align-items: center;
        text-align: left;
    }

    .founder-image {
        flex: 0 0 auto;
        width: 220px;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }
    
    .nav-brand {
        font-size: 1.125rem;
        letter-spacing: 0.15rem;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
        font-size: 0.875rem;
    }
    
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 1.5rem;
        letter-spacing: 0;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .service-heading {
        font-size: 1.25rem;
    }
    
    .service-subtitle {
        font-size: 0.9375rem;
    }
    
    .service-list li {
        font-size: 0.9375rem;
        padding-left: var(--spacing-sm);
    }
    
    .service-item {
        margin-bottom: var(--spacing-lg);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .company-name {
        font-size: 1.75rem;
        letter-spacing: 0.15rem;
    }
    
    .tagline {
        font-size: 0.9375rem;
        letter-spacing: 0.05rem;
    }
    
    .section-title {
        font-size: 1.375rem;
    }
    
    .section-content {
        font-size: 0.9375rem;
    }
    
    .highlight-list li {
        font-size: 0.9375rem;
        padding-left: var(--spacing-sm);
    }
    
    .highlights {
        padding: var(--spacing-md);
    }
    
    .language-toggle {
        bottom: 0.75rem;
        right: 0.75rem;
    }
    
    .lang-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.8125rem;
    }

    .founder-image {
        width: 180px;
    }
}

/* Print Styles */
@media print {
    .language-toggle {
        display: none;
    }
    
    .header {
        background: var(--white);
        color: var(--primary-dark);
        border-bottom: 2px solid var(--primary-dark);
    }
    
    .highlights {
        background: var(--white);
        border: 1px solid var(--border-color);
    }
}