:root { 
    --bg-dark: #00040a; 
    --bg-light: #ffffff;
    --p-accent: #00D1FF; 
    --text-dim: rgba(255,255,255,0.15); 
    --side-padding: 10vw;
}

body { 
    margin: 0; 
    background-color: var(--bg-dark); 
    transition: background-color 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    color: #fff; 
    overflow-x: hidden; 
    font-family: 'Pretendard', sans-serif; 
    -webkit-font-smoothing: antialiased; 
}

body.light-mode { background-color: var(--bg-light); color: #000; }

canvas { position: fixed; top: 0; left: 0; z-index: 5; pointer-events: none; }

nav { 
    position: fixed; top: 0; width: 100%; padding: 40px var(--side-padding); 
    display: flex; justify-content: space-between; align-items: center; 
    z-index: 1000; box-sizing: border-box; mix-blend-mode: difference; 
}
.logo { font-weight: 900; font-size: 1.1rem; letter-spacing: -0.05em; text-transform: uppercase; }
.nav-cta { color:inherit; text-decoration:none; font-size:0.8rem; font-weight:800; letter-spacing:0.05em; }

.container { position: relative; z-index: 10; width: 100%; }
section { position: relative; width: 100%; min-height: 100vh; display: flex; align-items: center; box-sizing: border-box; }

/* Hero */
/* 1. 섹션 설정: 수직 중앙 정렬(center)을 다시 활용해 이전 높이 복구 */
.hero-sec { 
    display: flex;
    flex-direction: column;
    justify-content: center; /* 수직 중앙 정렬로 이전 높이감 복원 */
    align-items: flex-start;
    overflow: hidden; 
    position: relative;
    min-height: 100vh;
}

/* 2. 타이틀: 불필요한 padding-top 제거 및 정렬 유지 */
.hero-h1 { 
    font-size: 8.5vw; 
    font-weight: 900; 
    line-height: 0.9; 
    text-align: left; 
    width: 100%; 
    padding-left: var(--side-padding); 
    /* padding-top: 25vh;  <-- 이 줄을 삭제하거나 주석 처리하세요 */
    letter-spacing: -0.06em; 
    margin: 0; 
    
    color: rgba(255, 255, 255, 0.98);
    filter: drop-shadow(0 4px 15px rgba(0,0,0,0.5)); 
    z-index: 10;
    
    /* 미세하게 위로 올라간 느낌이 든다면 아래 transform으로 정밀 조정 가능 */
    transform: translateY(2vh); 
}

/* 3. 설명글 영역: 위치 고정 */
.hero-desc-wrap { 
    position: absolute; 
    bottom: 12%; 
    right: var(--side-padding); 
    max-width: 460px; 
    text-align: right; 
    z-index: 10;
}
.hero-sub { font-size: 1.15rem; opacity: 0.6; line-height: 1.7; word-break: keep-all; font-weight: 500; }

/* Reveal Section */
.reveal-sec { padding: 0 var(--side-padding); flex-direction: column; align-items: flex-start; justify-content: center; }
.reveal-text { font-size: 3.2vw; font-weight: 600; line-height: 1.3; color: var(--text-dim); max-width: 1100px; letter-spacing: -0.03em; }

.shadow-risk-wrap { width: 100%; margin-top: 10vh; display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.risk-item { 
    padding: 40px; background: rgba(255,255,255,0.02); border-radius: 24px; border: 1px solid rgba(255,255,255,0.06); 
    opacity: 0; transform: translateY(40px);
}
.risk-item .label { display: block; font-size: 0.75rem; font-weight: 800; color: var(--p-accent); letter-spacing: 0.15em; margin-bottom: 15px; text-transform: uppercase; }
.risk-item .value { font-size: 3.8rem; font-weight: 900; margin-bottom: 10px; display: block; letter-spacing: -0.04em; }
.risk-item .desc { font-size: 1rem; opacity: 0.5; line-height: 1.5; }

/* Features */
.feature-showcase { padding: 20vh var(--side-padding); display: flex; flex-direction: column; gap: 35vh; }
.f-item { display: grid; grid-template-columns: 1fr 1.25fr; gap: 100px; align-items: center; }
.f-item.reverse { grid-template-columns: 1.25fr 1fr; }
.f-info span { color: var(--p-accent); font-weight: 800; font-size: 0.8rem; letter-spacing: 0.25em; display: block; margin-bottom: 24px; }
.f-info h3 { font-size: 3.8rem; font-weight: 800; line-height: 1.05; margin-bottom: 28px; letter-spacing: -0.05em; }
.f-info p { font-size: 1.2rem; opacity: 0.6; line-height: 1.7; margin-bottom: 44px; }
.f-list { list-style: none; padding: 0; }
.f-list li { margin-bottom: 18px; font-weight: 700; display: flex; align-items: center; gap: 14px; font-size: 1.05rem; }
.f-list li::before { content: "→"; color: var(--p-accent); font-weight: 900; }
.f-visual { position: relative; border-radius: 32px; background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.08); aspect-ratio: 16/10; display: flex; align-items: center; justify-content: center; }

/* Grid Ecosystem */
.grid-sec { padding: 30vh var(--side-padding); display: grid; grid-template-columns: 1fr 1.3fr; gap: 100px; align-items: start; }
.grid-sticky-title h2 { font-size: 4.8vw; line-height: 1.0; letter-spacing: -0.05em; font-weight: 900; position: sticky; top: 25vh; }
.grid-cards { display: flex; flex-direction: column; gap: 80px; }
.card { background: rgba(255,255,255,0.03); padding: 45px 60px; border-radius: 56px; border: 1px solid rgba(255,255,255,0.06); display: flex; flex-direction: column; transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.card:hover { border-color: var(--p-accent); transform: translateY(-10px); background: rgba(0, 209, 255, 0.02); }
.card h3 { font-size: 3.2rem; font-weight: 800; margin-bottom: 16px; color: var(--p-accent); letter-spacing: -0.04em; }
.card p { font-size: 1.4rem; opacity: 0.7; line-height: 1.5; margin-bottom: 35px; word-break: keep-all; }
.card-visual-box { width: 100%; height: 300px; background: rgba(255,255,255,0.015); border: 1px solid rgba(255,255,255,0.04); border-radius: 32px; display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
.diag-text { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; }

/* Light Mode Card Overrides */
body.light-mode .card { background: #ffffff; border-color: rgba(0,0,0,0.04); box-shadow: 0 50px 100px rgba(0,0,0,0.05); color: #000; }
body.light-mode .card-visual-box { background: rgba(0,0,0,0.01); border-color: rgba(0,0,0,0.04); }

/* Manifesto & CTA */
.manifesto-sec { padding: 30vh var(--side-padding); text-align: center; flex-direction: column; }
.manifesto-h2 { font-size: 2.8vw; font-weight: 400; line-height: 1.35; color: var(--text-dim); max-width: 1100px; margin: 0 auto; }
.manifesto-h2 b { color: #fff; font-weight: 600; }
body.light-mode .manifesto-h2 b { color: #000; }
.btn-cta { margin-top: 60px; padding: 24px 70px; border-radius: 100px; border: none; background: var(--p-accent); color: #000; font-weight: 900; font-size: 1.05rem; cursor: pointer; transition: 0.4s; text-transform: uppercase; letter-spacing: 0.05em; }

/* Animations */
@keyframes flow-active { 0% { stroke-dashoffset: 24; } 100% { stroke-dashoffset: 0; } }
@keyframes scan-line { 0% { transform: translateY(-80px); opacity: 0; } 50% { opacity: 1; } 100% { transform: translateY(80px); opacity: 0; } }
@keyframes pulse-node { 0%, 100% { opacity: 0.3; } 50% { opacity: 1; } }
.animate-flow { stroke-dasharray: 6 6; animation: flow-active 0.8s linear infinite; }
.animate-scan { animation: scan-line 3s ease-in-out infinite; }
.node-pulse { animation: pulse-node 2s infinite ease-in-out; }