:root {
    --primary: #020617;
    --accent: #2563eb;
    --sub-accent: #f97316;
    --bg: #ffffff;
    --card-bg: #f8fafc;
    --line: #e2e8f0;

    --tier1: #0ea5e9;
    --tier2: #8b5cf6;

    --axis1: #475569;
    --axis2: #0ea5e9;
    --axis3: #06b6d4;
    --axis4: #8b5cf6;

    --text-main: #1e293b;
    --text-soft: #475569;
    --text-muted: #64748b;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Pretendard', sans-serif;
    color: var(--text-main);
    background: var(--bg);
    line-height: 1.7;
    word-break: keep-all;
}

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
}

header.simple-nav {
    padding: 30px 0;
    text-align: center;
    border-bottom: 1px solid #f1f5f9;
    background: #fff;
}

.logo {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -1px;
}

.logo-sub {
    margin-top: 8px;
    font-size: 0.96rem;
    color: var(--text-muted);
    font-weight: 600;
}

.hero {
    padding: 86px 0 42px;
    text-align: center;
}

.hero h1 {
    margin: 0;
    font-size: 3.15rem;
    line-height: 1.2;
    letter-spacing: -2px;
    font-weight: 800;
    color: var(--primary);
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    max-width: 920px;
    margin: 24px auto 0;
    font-size: 1.08rem;
    color: var(--text-soft);
}

.hero-keywords {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.hero-keywords span {
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: #f8fafc;
    color: var(--text-soft);
    font-size: 0.9rem;
    font-weight: 700;
}

.visual-wrap {
    width: 100%;
    margin: 54px auto 96px;
    border-radius: 30px;
    background: #f1f5f9;
    padding: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.concept-svg {
    width: 100%;
    height: auto;
    display: block;
    background: white;
    border-radius: 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 56px;
}

.section-title h2 {
    margin: 0;
    font-size: 2.28rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--primary);
}

.section-title p {
    margin: 16px auto 0;
    max-width: 860px;
    font-size: 1rem;
    color: var(--text-muted);
}

.focus-box {
    background: linear-gradient(135deg, #eff6ff 0%, #f8fbff 100%);
    border: 1px solid #dbeafe;
    border-radius: 24px;
    padding: 34px;
    margin-bottom: 92px;
}

.focus-box h3 {
    margin: 0 0 12px 0;
    font-size: 1.35rem;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.focus-box p {
    margin: 0;
    color: var(--text-soft);
    font-size: 1rem;
}

.tier-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 100px;
}

.tier-card {
    background: var(--card-bg);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 34px;
    transition: 0.25s ease;
}

.tier-card:hover,
.axis-card:hover,
.pipeline-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 18px 36px rgba(0,0,0,0.05);
}

.tier-card.tier-1 { border-top: 6px solid var(--tier1); }
.tier-card.tier-2 { border-top: 6px solid var(--tier2); }

.tier-badge,
.axis-badge,
.pipeline-step {
    display: inline-block;
    margin-bottom: 18px;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.2px;
}

.tier-1 .tier-badge { background: #e0f2fe; color: var(--tier1); }
.tier-2 .tier-badge { background: #f5f3ff; color: var(--tier2); }

.tier-card h3,
.axis-card h3,
.pipeline-card h3,
.integration-box h3 {
    margin: 0 0 14px 0;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.tier-card h3 { font-size: 1.5rem; }
.axis-card h3 { font-size: 1.38rem; }
.pipeline-card h3,
.integration-box h3 { font-size: 1.42rem; }

.tier-card p,
.axis-summary,
.pipeline-card p,
.integration-box p {
    color: var(--text-soft);
    font-size: 0.98rem;
}

.tier-card p,
.axis-summary,
.pipeline-card p {
    margin: 0 0 18px 0;
    font-weight: 600;
}

.integration-box p { margin: 0; }

.tier-card ul,
.axis-card ul,
.pipeline-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--text-muted);
    font-size: 0.96rem;
}

.tier-card li,
.axis-card li,
.pipeline-card li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 10px;
}

.tier-card li::before,
.pipeline-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 800;
}

.axis-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 100px;
}

.axis-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 30px;
    transition: 0.25s ease;
}

.axis-card.axis-1 { border-top: 6px solid var(--axis1); }
.axis-card.axis-2 { border-top: 6px solid var(--axis2); }
.axis-card.axis-3 { border-top: 6px solid var(--axis3); }
.axis-card.axis-4 { border-top: 6px solid var(--axis4); }

.axis-1 .axis-badge { background: #f1f5f9; color: var(--axis1); }
.axis-2 .axis-badge { background: #eff6ff; color: var(--axis2); }
.axis-3 .axis-badge { background: #ecfeff; color: var(--axis3); }
.axis-4 .axis-badge { background: #f5f3ff; color: var(--axis4); }

.axis-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 800;
}

.pipeline-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 100px;
}

.pipeline-card {
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 34px;
    transition: 0.25s ease;
}

.pipeline-step {
    background: #eff6ff;
    color: var(--accent);
}

.integration-box {
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 40px;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    margin-bottom: 100px;
}

footer {
    padding: 80px 0;
    background: var(--primary);
    color: #94a3b8;
    text-align: center;
    font-size: 0.92rem;
}

.btn-mail {
    color: white;
    text-decoration: none;
    font-weight: 700;
    border-bottom: 1px solid var(--accent);
}

@media (max-width: 1080px) {
    .axis-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 980px) {
    .tier-grid,
    .pipeline-grid,
    .axis-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.35rem;
    }

    .section-title h2 {
        font-size: 1.95rem;
    }

    .tier-card,
    .axis-card,
    .pipeline-card {
        padding: 30px;
    }
}