@charset "UTF-8";

/* ==========================================================================
   (주)두웰이엔지 - FSW 기술 원리 (Clean Pure White & Monochrome / Max Weight 600)
   ========================================================================== */

:root {
    --f-bg-white: #ffffff;
    --f-bg-light: #f8f9fa;
    --f-bg-card-hover: #f1f3f5;

    --f-text-primary: #373a3c;
    --f-text-secondary: #636c72;
    --f-text-muted: #959da5;

    --f-border-line: #dee2e6;
    --f-border-strong: #373a3c;

    --f-transition: 0.22s cubic-bezier(0.2, 0, 0, 1);
}

.fsw-page {
    background-color: var(--f-bg-white) !important;
    color: var(--f-text-primary);
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    letter-spacing: -0.02em;
    -webkit-font-smoothing: antialiased;
}

.fsw-main-container {
    background-color: var(--f-bg-white);
}

.max-layout-width {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2.5rem;
    box-sizing: border-box;
}

/* ==========================================================================
   1. HERO BANNER ZONE
   ========================================================================== */
.fsw-hero {
    position: relative;
    height: 55vh;
    min-height: 460px;
    width: 100%;
    background-color: #000000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--f-border-line);
    overflow: hidden;
}

.fsw-hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/img/tech/fsw_hero.png');
    background-size: cover;
    background-position: center;
    filter: none !important;
}

.hero-overlay-filter {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.50) 0%, rgba(0, 0, 0, 0.90) 100%);
    pointer-events: none;
}

.fsw-hero-inner {
    position: relative;
    z-index: 5;
    padding-top: 4rem;
}

.eng-sub-badge {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.35em;
    color: rgba(255, 255, 255, 0.85);
    display: block;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.fsw-hero-title {
    font-size: clamp(3rem, 5.5vw, 4.8rem);
    font-weight: 600;
    margin: 0 0 1rem 0;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: #ffffff;
}

.solid-white {
    color: #ffffff;
}

.hero-watermark-code {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    color: rgba(255, 255, 255, 0.6);
}

.fsw-intro-lead {
    padding: 70px 0 35px;
    text-align: center;
    background-color: var(--f-bg-white);
    border-bottom: 1px solid var(--f-border-line);
}

.company-brand-txt {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--f-text-primary);
    margin: 0 0 8px 0;
    letter-spacing: -0.02em;
}

.company-lead-p {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--f-text-secondary);
    margin: 0;
}

/* ==========================================================================
   2. 4대 텍스트 언더라인 탭 네비게이션
   ========================================================================== */
.fsw-underline-nav-section {
    padding: 20px 0 60px;
    background-color: var(--f-bg-white);
}

.underline-category-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4.5rem;
    border-bottom: 1px solid var(--f-border-line);
    padding-bottom: 0;
}

.nav-underline-item {
    position: relative;
    padding: 16px 8px 20px;
    text-decoration: none;
    cursor: pointer;
    background: transparent;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.nav-underline-item span {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--f-text-muted);
    transition: color var(--f-transition);
    letter-spacing: -0.02em;
}

.nav-underline-item:hover span {
    color: var(--f-text-primary);
}

.nav-underline-item::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--f-border-strong);
    transition: width var(--f-transition);
}

.nav-underline-item.active span {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--f-text-primary);
}

.nav-underline-item.active::after {
    width: 100%;
}

/* ==========================================================================
   3. FSW 독립 독자 아키텍처 본문
   ========================================================================== */
.fsw-standalone-architecture {
    padding: 0 0 140px;
    background-color: var(--f-bg-white);
}

.fsw-section-heading {
    margin-bottom: 40px;
    border-left: 2px solid var(--f-border-strong);
    padding-left: 1.2rem;
}

.heading-tag {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--f-text-muted);
    letter-spacing: 0.2em;
    display: block;
    margin-bottom: 6px;
    text-transform: uppercase;
}

.heading-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--f-text-primary);
    margin: 0;
    letter-spacing: -0.02em;
}

/* 공통 비주얼 이미지 프레임 */
.fsw-visual-frame {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 360px;
    background: #e9ecef;
    border: 1px solid var(--f-border-line);
    overflow: hidden;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.05);
}

.fsw-frame-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: none;
}

.media-scan-line {
    display: none;
}

.frame-corner {
    position: absolute;
    width: 12px;
    height: 12px;
    border-color: var(--f-border-strong);
    border-style: solid;
    pointer-events: none;
    z-index: 4;
}
.c-tl { top: 12px; left: 12px; border-width: 1px 0 0 1px; }
.c-tr { top: 12px; right: 12px; border-width: 1px 1px 0 0; }
.c-bl { bottom: 12px; left: 12px; border-width: 0 0 1px 1px; }
.c-br { bottom: 12px; right: 12px; border-width: 0 1px 1px 0; }

/* ──────────────────────────────────────────────────────────────────────────
   4-1. 패러다임 빌보드 박스
   ────────────────────────────────────────────────────────────────────────── */
.fsw-paradigm-billboard {
    background: var(--f-bg-light);
    border: 1px solid var(--f-border-line);
    border-top: 3px solid var(--f-border-strong);
    padding: 3.5rem 3rem;
    margin-bottom: 90px;
    position: relative;
}

.billboard-grid-wrap {
    display: grid;
    grid-template-columns: 1.25fr 1fr;
    gap: 45px;
    align-items: stretch;
}

.billboard-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.meta-tag {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--f-text-muted);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.meta-num {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--f-text-muted);
}

.billboard-title {
    font-size: clamp(2rem, 2.8vw, 2.4rem);
    font-weight: 600;
    color: var(--f-text-primary);
    margin: 0 0 20px 0;
    line-height: 1.3;
    letter-spacing: -0.03em;
}

.billboard-desc {
    font-size: 1.02rem;
    color: var(--f-text-secondary);
    line-height: 1.8;
    margin: 0 0 35px 0;
    word-break: keep-all;
}

.billboard-desc strong {
    color: var(--f-text-primary);
    font-weight: 600;
}

.billboard-core-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding-top: 25px;
    border-top: 1px solid var(--f-border-line);
}

.strip-item {
    background: var(--f-bg-white);
    border: 1px solid var(--f-border-line);
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.strip-k {
    font-size: 0.78rem;
    color: var(--f-text-muted);
    font-weight: 600;
}

.strip-v {
    font-size: 0.95rem;
    color: var(--f-text-primary);
    font-weight: 600;
    word-break: keep-all;
}

/* ──────────────────────────────────────────────────────────────────────────
   4-2. 4단계 프로세스 타임라인
   ────────────────────────────────────────────────────────────────────────── */
.fsw-process-flow-section {
    margin-bottom: 90px;
}

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

.timeline-step-card {
    background: var(--f-bg-white);
    border: 1px solid var(--f-border-line);
    padding: 2.2rem 1.8rem;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: border-color var(--f-transition), box-shadow var(--f-transition), transform var(--f-transition);
}

.timeline-step-card:hover {
    border-color: var(--f-border-strong);
    transform: translateY(-5px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.05);
}

.step-badge {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--f-text-muted);
    margin-bottom: 6px;
    letter-spacing: 0.08em;
}

.step-icon-wrap {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--f-text-muted);
    letter-spacing: 0.1em;
    margin-bottom: 14px;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--f-text-primary);
    margin: 0 0 12px 0;
    line-height: 1.35;
    letter-spacing: -0.02em;
}

.step-desc {
    font-size: 0.92rem;
    color: var(--f-text-secondary);
    line-height: 1.65;
    margin: 0;
    word-break: keep-all;
}

/* ──────────────────────────────────────────────────────────────────────────
   4-3. 비교 매트릭스 테이블
   ────────────────────────────────────────────────────────────────────────── */
.fsw-comparison-matrix-section {
    margin-bottom: 90px;
}

.comparison-table-wrap {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--f-border-line);
    background: var(--f-bg-white);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.comparison-table th {
    padding: 18px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    background: var(--f-bg-light);
    border-bottom: 1px solid var(--f-border-line);
}

.comparison-table th.col-criteria {
    width: 180px;
    color: var(--f-text-muted);
}

.comparison-table th.col-fusion {
    width: 40%;
    color: var(--f-text-secondary);
}

.comparison-table th.col-fsw {
    width: 40%;
    color: var(--f-text-primary);
    background: var(--f-bg-card-hover);
    border-left: 1px solid var(--f-border-line);
}

.comparison-table td {
    padding: 18px 24px;
    font-size: 0.92rem;
    line-height: 1.6;
    border-bottom: 1px solid var(--f-border-line);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.tbl-criteria {
    font-weight: 600;
    color: var(--f-text-primary);
    background: var(--f-bg-white);
}

.tbl-fusion {
    color: var(--f-text-secondary);
}

.tbl-fsw {
    color: var(--f-text-primary);
    font-weight: 600;
    background: var(--f-bg-light);
    border-left: 1px solid var(--f-border-line);
}

.highlight-td {
    border-left: 2px solid var(--f-border-strong);
}

/* ──────────────────────────────────────────────────────────────────────────
   4-4. 미세조직 섹션
   ────────────────────────────────────────────────────────────────────────── */
.fsw-microstructure-section {
    margin-bottom: 90px;
}

.microstructure-split-wrap {
    display: grid;
    grid-template-columns: 1fr 1.35fr;
    gap: 40px;
    align-items: stretch;
}

.microstructure-cards-col {
    display: flex;
    flex-direction: column;
    gap: 16px;
    justify-content: space-between;
}

.micro-zone-card {
    background: var(--f-bg-white);
    border: 1px solid var(--f-border-line);
    border-left: 3px solid var(--f-border-strong);
    padding: 1.8rem 2rem;
    display: flex;
    flex-direction: column;
    transition: border-color var(--f-transition), box-shadow var(--f-transition);
}

.micro-zone-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
}

.zone-badge {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--f-text-muted);
    letter-spacing: 0.1em;
    margin-bottom: 6px;
    text-transform: uppercase;
}

.zone-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--f-text-primary);
    margin: 0 0 4px 0;
    letter-spacing: -0.02em;
}

.zone-summary {
    font-size: 0.88rem;
    color: var(--f-text-secondary);
    font-weight: 500;
    margin: 0 0 10px 0;
}

.zone-desc {
    font-size: 0.92rem;
    color: var(--f-text-secondary);
    line-height: 1.65;
    margin: 0;
    word-break: keep-all;
}

/* ──────────────────────────────────────────────────────────────────────────
   4-5. 하단 배너 CTA
   ────────────────────────────────────────────────────────────────────────── */
.fsw-bottom-banner {
    background: var(--f-bg-light);
    border: 1px solid var(--f-border-line);
    border-left: 3px solid var(--f-border-strong);
    padding: 3.5rem 3.5rem;
}

.banner-inner-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
}

.btm-tag {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--f-text-muted);
    letter-spacing: 0.15em;
    display: block;
    margin-bottom: 6px;
    text-transform: uppercase;
}

.btm-title {
    font-size: 1.55rem;
    font-weight: 600;
    color: var(--f-text-primary);
    margin: 0 0 8px 0;
    letter-spacing: -0.02em;
}

.btm-desc {
    font-size: 0.95rem;
    color: var(--f-text-secondary);
    margin: 0;
}

.btn-banner-archive {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: var(--f-border-strong);
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    border: 1px solid var(--f-border-strong);
    transition: all var(--f-transition);
}

.btn-banner-archive .btn-arrow {
    font-style: normal;
    transition: transform var(--f-transition);
}

.btn-banner-archive:hover {
    background: #ffffff;
    color: #000000;
}

.btn-banner-archive:hover .btn-arrow {
    transform: translateX(4px);
}

/* ==========================================================================
   반응형 미디어 쿼리
   ========================================================================== */
@media (min-width: 1440px) {
    .max-layout-width {
        padding: 0 3.5rem;
    }
    .underline-category-nav {
        gap: 5.5rem;
    }
    .fsw-timeline-grid {
        gap: 28px;
    }
}

@media (max-width: 1439px) and (min-width: 1024px) {
    .max-layout-width {
        padding: 0 2.5rem;
    }
    .fsw-hero {
        min-height: 420px;
    }
    .fsw-intro-lead {
        padding: 55px 0 25px;
    }
    .underline-category-nav {
        gap: 3.5rem;
    }
    .nav-underline-item span {
        font-size: 1.15rem;
    }
    .nav-underline-item.active span {
        font-size: 1.25rem;
    }
    .fsw-standalone-architecture {
        padding-bottom: 110px;
    }
    .fsw-paradigm-billboard {
        padding: 3rem 2.4rem;
        margin-bottom: 75px;
    }
    .billboard-grid-wrap {
        gap: 35px;
    }
    .fsw-process-flow-section,
    .fsw-comparison-matrix-section,
    .fsw-microstructure-section {
        margin-bottom: 75px;
    }
    .fsw-timeline-grid {
        gap: 18px;
    }
    .timeline-step-card {
        padding: 1.8rem 1.4rem;
    }
    .microstructure-split-wrap {
        gap: 30px;
    }
    .micro-zone-card {
        padding: 1.5rem 1.6rem;
    }
}

@media (max-width: 1023px) and (min-width: 768px) {
    .max-layout-width {
        padding: 0 2rem;
    }
    .fsw-hero {
        height: 48vh;
        min-height: 380px;
    }
    .fsw-hero-inner {
        padding-top: 3rem;
    }
    .fsw-intro-lead {
        padding: 45px 0 20px;
    }
    .company-brand-txt {
        font-size: 1.55rem;
    }
    .underline-category-nav {
        gap: 2.2rem;
    }
    .nav-underline-item span {
        font-size: 1.05rem;
    }
    .nav-underline-item.active span {
        font-size: 1.15rem;
    }
    .fsw-standalone-architecture {
        padding-bottom: 90px;
    }
    .fsw-section-heading {
        margin-bottom: 30px;
    }
    .fsw-paradigm-billboard {
        padding: 2.5rem 2rem;
        margin-bottom: 60px;
    }
    .billboard-grid-wrap {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .billboard-core-strip {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }
    .fsw-process-flow-section,
    .fsw-comparison-matrix-section,
    .fsw-microstructure-section {
        margin-bottom: 60px;
    }
    .fsw-timeline-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }
    .microstructure-split-wrap {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .fsw-bottom-banner {
        padding: 2.8rem 2.4rem;
    }
}

@media (max-width: 767px) {
    .max-layout-width {
        padding: 0 1.5rem;
    }
    .fsw-hero {
        height: 42vh;
        min-height: 330px;
    }
    .fsw-hero-inner {
        padding-top: 2rem;
    }
    .eng-sub-badge {
        font-size: 0.72rem;
        letter-spacing: 0.25em;
        margin-bottom: 0.7rem;
    }
    .fsw-hero-title {
        font-size: 2.4rem;
    }
    .hero-watermark-code {
        font-size: 0.65rem;
        letter-spacing: 0.15em;
    }
    .fsw-intro-lead {
        padding: 35px 0 15px;
    }
    .company-brand-txt {
        font-size: 1.35rem;
    }
    .company-lead-p {
        font-size: 0.92rem;
    }
    .fsw-underline-nav-section {
        padding: 10px 0 35px;
    }
    .underline-category-nav {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        border-bottom: none;
    }
    .nav-underline-item {
        border-bottom: 1px solid var(--f-border-line);
        padding: 10px 0;
        width: 100%;
    }
    .nav-underline-item span {
        font-size: 0.98rem;
    }
    .nav-underline-item.active span {
        font-size: 1.02rem;
    }
    .nav-underline-item::after {
        display: none;
    }
    .nav-underline-item.active {
        border-bottom: 2px solid var(--f-border-strong);
    }
    .fsw-standalone-architecture {
        padding-bottom: 70px;
    }
    .fsw-section-heading {
        margin-bottom: 25px;
        padding-left: 1rem;
    }
    .heading-tag {
        font-size: 0.72rem;
    }
    .heading-title {
        font-size: 1.45rem;
    }
    .fsw-visual-frame {
        min-height: 260px;
    }
    .fsw-paradigm-billboard {
        padding: 2rem 1.4rem;
        margin-bottom: 50px;
    }
    .billboard-grid-wrap {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    .billboard-title {
        font-size: 1.6rem;
        margin-bottom: 14px;
    }
    .billboard-desc {
        font-size: 0.92rem;
        line-height: 1.65;
        margin-bottom: 25px;
    }
    .billboard-core-strip {
        grid-template-columns: 1fr;
        gap: 10px;
        padding-top: 18px;
    }
    .fsw-process-flow-section,
    .fsw-comparison-matrix-section,
    .fsw-microstructure-section {
        margin-bottom: 50px;
    }
    .fsw-timeline-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .timeline-step-card {
        padding: 1.6rem 1.4rem;
    }
    .step-title {
        font-size: 1.12rem;
    }
    .step-desc {
        font-size: 0.88rem;
    }
    .comparison-table th,
    .comparison-table td {
        padding: 12px 14px;
        font-size: 0.86rem;
    }
    .comparison-table th.col-criteria {
        width: 120px;
    }
    .microstructure-split-wrap {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .micro-zone-card {
        padding: 1.4rem 1.25rem;
    }
    .zone-name {
        font-size: 1.12rem;
    }
    .zone-desc {
        font-size: 0.88rem;
    }
    .fsw-bottom-banner {
        padding: 2rem 1.4rem;
    }
    .banner-inner-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 18px;
    }
    .btm-title {
        font-size: 1.3rem;
    }
    .btm-desc {
        font-size: 0.88rem;
    }
    .btn-banner-archive {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
        font-size: 0.88rem;
        box-sizing: border-box;
    }
}

@media (max-width: 479px) {
    .max-layout-width {
        padding: 0 1rem;
    }
    .fsw-hero {
        min-height: 290px;
    }
    .fsw-hero-inner {
        padding-top: 1.5rem;
    }
    .fsw-hero-title {
        font-size: 2rem;
    }
    .company-brand-txt {
        font-size: 1.2rem;
    }
    .company-lead-p {
        font-size: 0.85rem;
    }
    .nav-underline-item span {
        font-size: 0.9rem;
    }
    .nav-underline-item.active span {
        font-size: 0.94rem;
    }
    .fsw-standalone-architecture {
        padding-bottom: 50px;
    }
    .heading-title {
        font-size: 1.3rem;
    }
    .fsw-visual-frame {
        min-height: 220px;
    }
    .fsw-paradigm-billboard {
        padding: 1.6rem 1.15rem;
    }
    .billboard-title {
        font-size: 1.4rem;
    }
    .strip-item {
        padding: 12px 14px;
    }
    .strip-k {
        font-size: 0.72rem;
    }
    .strip-v {
        font-size: 0.88rem;
    }
    .timeline-step-card {
        padding: 1.35rem 1.15rem;
    }
    .comparison-table-wrap {
        font-size: 0.82rem;
    }
    .micro-zone-card {
        padding: 1.2rem 1.1rem;
    }
    .fsw-bottom-banner {
        padding: 1.6rem 1.15rem;
    }
    .btm-title {
        font-size: 1.18rem;
    }
    .btn-banner-archive {
        padding: 12px 16px;
        font-size: 0.84rem;
    }
}