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

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

body {
    font-family: "Pretendard", "Noto Sans KR", sans-serif;
    color: #14181f;
    line-height: 1.6;
    background: #ffffff;
}

/* COMMON */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section {
    padding: 5rem 0;
}

.section_gray {
    background: #f5f7fa;
}

.section_head {
    margin-bottom: 2rem;
}

h1, h2, h3 {
    letter-spacing: -0.03em;
}

h2 {
    font-size: 2rem;
}

.section_sub {
    margin-top: 0.75rem;
    color: #4a5568;
    font-size: 1.05rem;
}

/* HEADER */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(0.6rem);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header_inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.brand {
    font-weight: 800;
    text-decoration: none;
    color: #0f172a;
    font-size: 1.1rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav a {
    text-decoration: none;
    color: #334155;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.55rem 0.75rem;
    border-radius: 0.6rem;
}

.nav a:hover {
    background: rgba(15, 23, 42, 0.06);
}

.nav_cta {
    background: #0b5bd3;
    color: #ffffff !important;
}

.nav_cta:hover {
    background: #0a4fb9;
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 700;
    border-radius: 0.75rem;
    padding: 0.9rem 1.2rem;
    font-size: 1rem;
    gap: 0.5rem;
    white-space: nowrap;
}

.btn_primary {
    background: #0b5bd3;
    color: #ffffff;
}

.btn_primary:hover {
    background: #0a4fb9;
}

.btn_outline {
    border: 1px solid rgba(15, 23, 42, 0.18);
    color: #0f172a;
    background: rgba(255, 255, 255, 0.75);
}

.btn_outline:hover {
    background: rgba(15, 23, 42, 0.06);
}

/* HERO */
.hero {
    min-height: 72vh;
    display: grid;
    place-items: center;
    padding: 6rem 0 4rem;
    background:
        linear-gradient(rgba(0, 0, 0, 0.52), rgba(0, 0, 0, 0.58)),
        url("../image_2/image4.png") center / cover no-repeat;
}

.hero_inner {
    text-align: center;
    color: #ffffff;
}

.hero_badge {
    display: inline-block;
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.15;
}

.hero_desc {
    margin: 1.2rem auto 0;
    max-width: 52rem;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero_actions {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.hero_metrics {
    margin: 3rem auto 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 60rem;
}

.metric {
    background: rgba(255, 255, 255, 0.10);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 1rem;
    padding: 1.2rem;
}

.metric strong {
    display: block;
    font-size: 1.05rem;
}

.metric span {
    display: block;
    margin-top: 0.35rem;
    color: rgba(255, 255, 255, 0.88);
    font-weight: 600;
}

/* ABOUT */
.about_grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about_text p + p {
    margin-top: 1rem;
}

.about_links {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.text_link {
    color: #0b5bd3;
    text-decoration: none;
    font-weight: 800;
}

.text_link:hover {
    text-decoration: underline;
}

.about_image img {
    width: 100%;
    border-radius: 1rem;
    display: block;
}

/* SERVICES */
.service_grid {
    display: grid;
    grid-template-columns: 1fr !important;
    gap: 2rem;
}

.service_card {
    background: #ffffff;
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 1rem;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.service_card img {
    width: 100%;
    height: 12rem;
    object-fit: cover;
    border-radius: 0.8rem;
    display: block;
}

.service_card h3 {
    font-size: 1.25rem;
}

.service_card p {
    color: #475569;
}

.card_link {
    margin-top: auto;
    text-decoration: none;
    font-weight: 800;
    color: #0b5bd3;
}

.card_link:hover {
    text-decoration: underline;
}

/* WHY */
.why_grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.why_card {
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 1rem;
    padding: 1.5rem;
    background: #ffffff;
}

.why_card h3 {
    font-size: 1.1rem;
}

.why_card p {
    margin-top: 0.7rem;
    color: #475569;
}

/* PARTNERSHIP */
.partnership {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.partnership_actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.partnership_image img {
    width: 100%;
    border-radius: 1rem;
    display: block;
}

/* CONTACT */
.contact_box {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 1.2rem;
    overflow: hidden;
}

.contact_text {
    padding: 2rem;
}

.contact_list {
    margin-top: 1.5rem;
    display: grid;
    gap: 1rem;
}

.contact_item {
    display: grid;
    grid-template-columns: 6rem 1fr;
    gap: 1rem;
    align-items: center;
}

.label {
    font-weight: 800;
    color: #0f172a;
}

.contact_item a {
    color: #0b5bd3;
    text-decoration: none;
    font-weight: 700;
}

.contact_item a:hover {
    text-decoration: underline;
}

.contact_note {
    margin-top: 1.25rem;
    color: #64748b;
    font-size: 0.95rem;
}

.contact_image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* FOOTER */
.footer {
    padding: 2.5rem 0;
    border-top: 1px solid rgba(15, 23, 42, 0.08);
    background: #0b1220;
    color: rgba(255, 255, 255, 0.88);
}

.footer_inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer_brand {
    font-weight: 900;
}

.footer_copy {
    color: rgba(255, 255, 255, 0.7);
}

.footer_top {
    color: #ffffff;
    text-decoration: none;
    font-weight: 800;
}

.footer_top:hover {
    text-decoration: underline;
}

/* RESPONSIVE */
@media (max-width: 980px) {
    .nav {
        gap: 0.35rem;
    }

    .nav a {
        padding: 0.5rem 0.6rem;
        font-size: 0.92rem;
    }

    .hero h1 {
        font-size: 2.3rem;
    }

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

    .about_grid,
    .service_grid,
    .partnership,
    .contact_box,
    .why_grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    h2 {
        font-size: 1.65rem;
    }

    .btn {
        width: 100%;
    }

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