/* ================= 공통: 섹션 ================= */
.section-eyebrow {
    font-size: .85rem;
    font-weight: 700;
    letter-spacing: .12em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

/* ================= 1. Hero ================= */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    /* 첫 화면(헤더 제외)을 꽉 채움 — 헤더 오프셋은 .site-main 이 처리 */
    min-height: calc(100vh - var(--header-height));
    padding: 60px 0 80px;
    /* 위에서부터: 텍스트 가독성용 오버레이 / RF·PLL 칩 일러스트 / 기본 그라디언트(이미지 로드 실패 시 대체) */
    background:
        radial-gradient(ellipse at 50% 48%, rgba(13, 42, 82, .78) 0%, rgba(13, 42, 82, .35) 55%, rgba(13, 42, 82, 0) 100%),
        url('../img/hero-rf.svg') center / cover no-repeat,
        linear-gradient(135deg, var(--color-primary), #0d2a52);
    color: #fff;
}

.hero-inner {
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -.01em;
    margin-bottom: 20px;
}

.hero-desc {
    max-width: 640px;
    margin: 0 auto 40px;
    font-size: 1.2rem;
    color: rgba(255, 255, 255, .88);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 56px;
}

.btn-light {
    background-color: #fff;
    color: var(--color-primary);
}
.btn-light:hover {
    background-color: #eaf1fb;
}

.btn-ghost {
    border: 1px solid rgba(255, 255, 255, .7);
    color: #fff;
}
.btn-ghost:hover {
    background-color: rgba(255, 255, 255, .14);
}

.btn-light:focus-visible,
.btn-ghost:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 3px;
}

.hero-keywords-label {
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, .78);
    margin-bottom: 14px;
}

.hero-keywords {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 10px;
}
.hero-keywords li {
    padding: 6px 14px;
    border: 1px solid rgba(255, 255, 255, .35);
    border-radius: 999px;
    font-size: .85rem;
    color: rgba(255, 255, 255, .92);
}

/* ================= 2. Main Solutions ================= */
.solutions-section {
    padding: 100px 0;
}
.solutions-section .section-title {
    margin-bottom: 40px;
}

.solution-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.solution-card {
    display: flex;
    flex-direction: column;
    padding: 32px 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: box-shadow .2s ease, transform .2s ease, border-color .2s ease;
}
.solution-card:hover,
.solution-card:focus-visible {
    box-shadow: var(--shadow);
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.solution-num {
    font-size: .85rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.solution-title {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.solution-desc {
    color: var(--color-muted);
    font-size: .9rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.solution-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
}
.solution-tags li {
    padding: 4px 10px;
    border-radius: 4px;
    background-color: var(--color-bg);
    font-size: .78rem;
    color: var(--color-primary);
    font-weight: 600;
}

/* ================= 3. COMPANY > About UTECH ================= */
.about-section {
    padding: 100px 0;
    background-color: var(--color-bg);
}

.about-inner {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 48px;
    align-items: start;
}

.about-title {
    font-size: 2rem;
}

.about-body p {
    color: var(--color-muted);
    line-height: 1.9;
    margin-bottom: 18px;
}
.about-body .about-closing {
    margin: 28px 0 0;
    padding-left: 18px;
    border-left: 3px solid var(--color-primary);
    color: var(--color-text);
    font-weight: 700;
}

/* ================= 4. PARTNERS ================= */
.partners-section {
    padding: 100px 0;
}
.partners-section .section-title {
    margin-bottom: 40px;
}

.partner-groups {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.partner-group {
    padding: 32px 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.partner-title {
    font-size: 1.15rem;
    margin-bottom: 12px;
}

.partner-desc {
    color: var(--color-muted);
    font-size: .92rem;
    line-height: 1.8;
}

.partner-logos {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 28px;
}
.partner-logos li {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 64px;
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}
.partner-logos img {
    max-height: 100%;
    object-fit: contain;
}

/* ================= 최신 제품 미리보기 ================= */
.product-preview {
    padding: 100px 0;
    background-color: var(--color-bg);
}

.preview-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 32px;
}

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

.preview-card {
    background-color: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .2s ease;
}
.preview-card:hover {
    transform: translateY(-4px);
}

.preview-thumb {
    width: 100%;
    aspect-ratio: 4 / 3;
    background-color: var(--color-border);
    overflow: hidden;
}
.preview-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-body {
    padding: 18px 20px;
}

.preview-title {
    font-size: 1rem;
    margin-bottom: 6px;
}

.preview-summary {
    font-size: .85rem;
    color: var(--color-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* ================= 최신 공지사항 ================= */
.notice-preview {
    padding: 100px 0;
}

.notice-list {
    max-width: 760px;
    margin: 0 auto;
    border-top: 2px solid var(--color-text);
}

.notice-list li a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 4px;
    border-bottom: 1px solid var(--color-border);
}
.notice-list li a:hover .notice-item-title {
    color: var(--color-primary);
}

.notice-item-title {
    font-size: .95rem;
}

.notice-item-date {
    font-size: .82rem;
    color: var(--color-muted);
}

.notice-empty {
    text-align: center;
    padding: 40px 0;
    color: var(--color-muted);
}

/* ================= 태블릿 (768~1199px) ================= */
@media (min-width: 768px) and (max-width: 1199px) {
    .solution-cards,
    .preview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ================= 모바일 (767px 이하) ================= */
@media (max-width: 767px) {
    .hero {
        min-height: calc(88vh - var(--header-height));
        padding: 40px 0 56px;
        /* 세로로 긴 화면에서는 칩(이미지 오른쪽)이 통째로 보이도록 기준점을 오른쪽 끝으로 이동 */
        background-position: center, 100% center, center;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-desc {
        font-size: 1rem;
        margin-bottom: 32px;
    }
    .hero-actions {
        flex-direction: column;
        margin-bottom: 40px;
    }

    .solutions-section,
    .about-section,
    .partners-section,
    .product-preview,
    .notice-preview {
        padding: 60px 0;
    }

    .solution-cards,
    .preview-grid,
    .partner-groups {
        grid-template-columns: 1fr;
    }
    .about-inner {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .about-title {
        font-size: 1.6rem;
    }
    .partner-logos {
        grid-template-columns: repeat(2, 1fr);
    }
    .preview-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}