@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Light.woff2') format('woff2');
    font-weight: 300;
    font-display: swap;
}

@font-face {
    font-family: 'Pretendard';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/pretendard@1.0/Pretendard-Bold.woff2') format('woff2');
    font-weight: 700;
    font-display: swap;
}

:root {
    --bg-white: #ffffff;
    --bg-gray: #f9f9f9;
    --text-black: #000000;
    --text-gray: #666666;
    --text-light: #999999;
    --accent: #000000;
    --border: #eeeeee;
    --radius: 0px; /* Sharp Apple-like or very subtle */
    --font: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-white);
    color: var(--text-black);
    font-family: var(--font);
    line-height: 1.5;
    overflow-x: hidden; /* Prevent horizontal scroll */
    width: 100%;
}

/* Base Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px; /* Reduced from 40px for mobile friendliness */
    width: 100%;
    box-sizing: border-box;
}

a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
}

/* Nav */
nav {
    border-bottom: 1px solid var(--border);
    background: rgba(255,255,255,0.8);
    backdrop-filter: saturate(180%) blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-inner {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 28px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: 32px;
    font-size: 0.9rem;
    font-weight: 500;
}

.btn-black {
    background: var(--text-black);
    color: var(--bg-white);
    padding: 8px 20px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: transform 0.2s;
}

.btn-black:hover {
    transform: scale(1.02);
    opacity: 1;
}

/* Sections */
section {
    padding: 120px 0;
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 24px;
}

.section-desc {
    font-size: 1.25rem;
    color: var(--text-gray);
    max-width: 600px;
}

/* Hero */
.hero {
    padding-top: 200px;
    padding-bottom: 120px;
    text-align: center;
    background: 
        linear-gradient(to bottom, rgba(255, 255, 255, 0.8) 0%, var(--bg-white) 100%),
        url('assets/hero_bg.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    filter: grayscale(100%); /* Maintain B&W Theme */
}

.hero h1 {
    font-size: 6rem;
    font-weight: 700; /* Requested weight */
    letter-spacing: -5px;
    line-height: 0.85;
    margin-bottom: 40px;
    position: relative;
    z-index: 2;
}

.hero p {
    font-size: 1.5rem;
    color: var(--text-gray);
    max-width: 700px;
    margin: 0 auto 48px;
    letter-spacing: -0.5px;
}

/* Features List */
.feature-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 60px 0;
    border-bottom: 1px solid var(--border);
}

.feature-info {
    flex: 1;
}

.feature-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-info p {
    font-size: 1.1rem;
    color: var(--text-gray);
    max-width: 400px;
}

.feature-visual {
    flex: 1;
    text-align: right;
    font-size: 3rem;
    font-weight: 800;
}

/* Image Visual Box */
.visual-box {
    background: var(--bg-gray);
    border: 1px solid var(--border);
    aspect-ratio: 16/10;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    overflow: hidden;
}

.visual-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%);
}

/* CTA */
.cta {
    text-align: center;
    background: #000;
    color: #fff;
    padding: 100px 0;
}

.cta h2 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -3px;
    margin-bottom: 32px;
}

/* Footer */
footer {
    padding: 80px 0 40px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-light);
}

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

@media (max-width: 768px) {
    section { padding: 60px 0; }
    .section-title { font-size: 2.2rem; letter-spacing: -1px; }
    .hero { padding-top: 140px; padding-bottom: 60px; }
    .hero h1 { font-size: 3rem; letter-spacing: -2px; }
    .hero p { font-size: 1.1rem; }
    
    .feature-row { 
        flex-direction: column; 
        gap: 24px; 
        padding: 40px 0;
    }
    .feature-visual { 
        text-align: left; 
        font-size: 2.5rem; 
        width: 100%;
        overflow-wrap: break-word;
    }
    
    .nav-inner { height: 60px; padding: 0 20px; }
    .nav-links { display: none; }
    
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 24px;
        text-align: left;
    }
    .footer-inner > div {
        width: 100%;
    }
    footer .social-links {
        margin-top: 12px;
        justify-content: flex-start;
    }
    
    .cta h2 { font-size: 2.5rem; letter-spacing: -1.5px; }
}