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

.logo_t {
    height: 50px;
}

:root {
    --blue: #0057FF;
    --blue-light: #4488FF;
    --dark: #0a0f1e;
    --text: #1a1a2e;
    --gray: #6b7280;
    --light: #f4f7ff;
    --white: #ffffff;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    color: var(--text);
    background: var(--white);
    overflow-x: hidden;
}


/* ── NAV ── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    height: 64px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 87, 255, 0.08);
    transition: box-shadow 0.3s;
}

nav.scrolled {
    box-shadow: 0 2px 24px rgba(0, 87, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Barlow', sans-serif;
    font-weight: 800;
    font-size: 22px;
    color: var(--blue);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--blue);
    border-radius: 8px;
    display: grid;
    place-items: center;
    color: white;
    font-size: 14px;
    font-weight: 900;
}

.nav-links {
    display: flex;
    gap: 36px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--blue);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: white;
    padding: 16px 5% 24px;
    z-index: 99;
    border-bottom: 1px solid rgba(0, 87, 255, 0.1);
    transform: translateY(-10px);
    opacity: 0;
    transition: all 0.3s;
}

.mobile-menu.open {
    display: block;
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu a {
    display: block;
    padding: 12px 0;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid #f0f0f0;
}

/* ── HERO ── */
.hero {
    min-height: 100vh;
    padding: 120px 5% 80px;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f4f7ff 0%, #e8f0ff 50%, #f0f5ff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    max-width: 700px;
    max-height: 700px;
    background: radial-gradient(circle, rgba(0, 87, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-grid {
    display: grid;
    gap: 60px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 87, 255, 0.08);
    color: var(--blue);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 20px;
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--blue);
    border-radius: 50%;
}

.hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 900;
    line-height: 1.2;
    color: var(--dark);
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.hero h1 em {
    font-style: normal;
    color: var(--blue);
}

.hero-sub {
    font-size: 13px;
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.hero-desc {
    font-size: 15px;
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--blue);
    color: white;
    border: none;
    padding: 13px 28px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    font-family: 'Noto Sans KR', sans-serif;
    cursor: pointer;
    transition: all 0.25s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: #0044cc;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 87, 255, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--text);
    border: 1.5px solid #e2e8f0;
    padding: 13px 28px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    font-family: 'Noto Sans KR', sans-serif;
    cursor: pointer;
    transition: all 0.25s;
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    border-color: var(--blue);
    color: var(--blue);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.wave {
    width: 600%;
    height: 700px;
}

/* ── SECTION HEADER ── */
.section-header {
    text-align: center;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(24px, 4vw, 40px);
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.5px;
    margin-top: 10px;
}

.section-header p {
    margin-top: 12px;
    font-size: 15px;
    color: var(--gray);
}

/* ── LETTERS SECTION ── */
.letters-section {
    width: 100%;
}

.letters-inner {
    max-width: 900px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 52px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #333;
    letter-spacing: -0.02em;
}

.section-header p {
    color: #6b7280;
    font-size: 1rem;
    margin-top: 40px;

}

.letters-grid {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.letter-card {
    flex: 1;
    background: #ffffff;
    border: 1.5px solid #e5e7eb;
    border-radius: 14px;
    padding: 24px 16px 20px;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
    user-select: none;
}

.letter-card:hover,
.letter-card.active {
    border-color: #2563eb;
    box-shadow: 0 6px 24px rgba(37, 99, 235, 0.13);
    transform: translateY(-3px);
}

.letter-big {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1;
    color: #2563eb;
    letter-spacing: -0.04em;
    transition: color 0.25s;
}

.letter-card:hover .letter-big,
.letter-card.active .letter-big {
    color: #2563eb;
}

.letter-label {
    font-size: 0.72rem;
    color: #9ca3af;
    font-weight: 600;
    margin-top: 6px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color 0.25s;
}

.letter-card:hover .letter-label,
.letter-card.active .letter-label {
    color: #2563eb;
}

.hvacr-panel-wrap {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.hvacr-panel-wrap.open {
    max-height: 300px;
}

.hvacr-panel {
    margin-top: 16px;
    background: #ffffff;
    border: 1.5px solid #e5e7eb;
    border-radius: 16px;
    padding: 28px 32px;
    display: flex;
    align-items: center;
    gap: 28px;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease 0.1s, transform 0.3s ease 0.1s;
}

.hvacr-panel-wrap.open .hvacr-panel {
    opacity: 1;
    transform: translateY(0);
}

.panel-icon {
    width: 80px;
    height: 80px;
    border-radius: 18px;
    background: #eff6ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.6rem;
    font-weight: 800;
    color: #2563eb;
    flex-shrink: 0;
    line-height: 1;
}

.panel-divider {
    width: 1.5px;
    height: 60px;
    background: #e5e7eb;
    flex-shrink: 0;
}

.panel-text {
    flex: 1;
}

.panel-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 8px;
}

.panel-desc {
    font-size: 0.92rem;
    color: #6b7280;
    line-height: 1.7;
    word-break: keep-all;
}

.hvacr-closing {
    margin-top: 48px;
    text-align: center;
}

.hvacr-closing p {
    font-size: 1.05rem;
    color: #9ca3af;
    font-weight: 400;
    line-height: 1.8;
    letter-spacing: -0.01em;
}

.hvacr-closing p em {
    font-style: normal;
    font-weight: 700;
    color: #2563eb;
}

/* ── INTRODUCE IMAGE CONTAINER ── */
.introduce-wrap {
    position: relative;
    width: 100vw;
    left: 50%;
    transform: translateX(-50%);
    overflow: hidden;
    margin: 0;
}

/* ── BACKGROUND IMAGE ── */
.introduce-img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 600px;
    object-fit: cover;
}

/* ── OPENING PANELS (좌우로 갈라지는 검은 배경) ── */
.introduce-panel {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 50%;
    background: #111;
    z-index: 1;
    animation: introduce-open 1s cubic-bezier(0.77, 0, 0.175, 1) forwards;
}

.introduce-panel--left {
    left: 0;
    transform-origin: left center;
}

.introduce-panel--right {
    right: 0;
    transform-origin: right center;
}

/* ── INTRODUCE COPY (이미지 위 중앙 텍스트) ── */
.introduce-copy {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    clip-path: inset(0 50% 0 50%);
    animation: introduce-copy-open 1s cubic-bezier(0.77, 0, 0.175, 1) forwards;
}

.introduce-copy p {
    margin: 0;
    color: #fff;
    font-size: clamp(1.2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: 0.05em;
    text-align: center;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
    white-space: nowrap;
    transition: opacity 0.3s ease;
}

/* ── KEYFRAMES ANIMATIONS ── */
@keyframes introduce-open {
    0% {
        transform: scaleX(1);
    }

    100% {
        transform: scaleX(0);
    }
}

@keyframes introduce-copy-open {
    0% {
        clip-path: inset(0 50% 0 50%);
    }

    100% {
        clip-path: inset(0 0% 0 0%);
    }
}

/* ── RESPONSIVE (반응형 모바일 스타일) ── */
@media (max-width: 600px) {
    .introduce-copy p {
        white-space: normal;
        padding: 0 16px;
    }
}


/* ══════════════════════════════════════════
   PRODUCTS SECTION — 사선 분할 3행 레이아웃
══════════════════════════════════════════ */
.products-section {
    background: var(--dark);
    padding: 0;
    overflow: hidden;
}

.ps-inner {
    width: 100%;
}

/* 각 행 공통 */
.ps-row {
    position: relative;
    display: grid;
    grid-template-columns: 55% 45%;
    height: 220px;
    overflow: hidden;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: height 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.ps-row:hover {
    height: 270px;
}

/* 이미지 영역 */
.ps-img-wrap {
    position: relative;
    overflow: hidden;
}

.ps-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.55);
    display: block;
    transition: transform 0.55s ease, filter 0.55s ease;
}

.ps-row:hover .ps-img-wrap img {
    transform: scale(1.06);
    filter: brightness(0.75);
}

/* ── 사선 경계: ps-left (이미지 왼쪽) ── */
/* 이미지 오른쪽 상단 모서리를 삼각형으로 잘라내어 사선 효과 */
.ps-row.ps-left .ps-img-wrap::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 270px 90px 0 0;
    border-color: var(--dark) transparent transparent transparent;
    transition: border-top-width 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.ps-row.ps-left:hover .ps-img-wrap::after {
    border-width: 270px 90px 0 0;
}

/* ── 사선 경계: ps-right (이미지 오른쪽) ── */
/* 이미지를 오른쪽 열에 배치 */
.ps-row.ps-right {
    grid-template-columns: 45% 55%;
}

.ps-row.ps-right .ps-img-wrap {
    order: 2;
}

.ps-row.ps-right .ps-text {
    order: 1;
    align-items: flex-start;
    text-align: left;
}

/* 이미지 왼쪽 상단을 반대 방향으로 사선 처리 */
.ps-row.ps-right .ps-img-wrap::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 90px 270px 0;
    border-color: transparent var(--dark) transparent transparent;
}

/* 텍스트 영역 */
.ps-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 0 44px;
    background: #111827;
    transition: background 0.4s;
}

.ps-row:hover .ps-text {
    background: #141e30;
}

/* 태그 뱃지 */
.ps-tag {
    display: inline-block;
    background: var(--blue);
    color: #fff;
    font-size: 9px;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 2px;
    margin-bottom: 10px;
    font-family: 'Barlow', sans-serif;
    font-weight: 600;
}

/* 제품명 */
.ps-title {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

/* 설명 */
.ps-desc {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.8;
    margin-bottom: 14px;
}

/* 키워드 칩 */
.ps-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ps-chip {
    background: rgba(0, 87, 255, 0.15);
    border: 1px solid rgba(0, 87, 255, 0.4);
    color: #7aadff;
    font-size: 10px;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.2px;
}


/* ── FEATURES ── */
.features-section {
    padding: 80px 5%;
    background: white;
}

.features-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.feature-card {
    padding: 32px 28px;
    border: 1.5px solid #e8edf5;
    border-radius: 16px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--blue);
    box-shadow: 0 12px 40px rgba(0, 87, 255, 0.08);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(0, 87, 255, 0.08);
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-size: 22px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark);
}

.feature-card p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.7;
}

/* ── STATS ── */
.stats-section {
    padding: 80px 5%;
    background: var(--dark);
}

.stats-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-num {
    font-family: 'Barlow', sans-serif;
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 900;
    color: white;
    letter-spacing: -1px;
    line-height: 1;
}

.stat-num span {
    color: var(--blue-light);
}

.stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 8px;
}

/* ── FOOTER ── */
footer {
    background: #0d1220;
    padding: 48px 5% 32px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 16px;
    display: inline-flex;
}

.footer-desc {
    font-size: 13px;
    line-height: 1.8;
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.footer-col a {
    display: block;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.45);
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-contact {
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    font-family: 'Barlow', sans-serif;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 1px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    display: grid;
    place-items: center;
    font-size: 14px;
    text-decoration: none;
    color: white;
    transition: background 0.2s;
}

.social-btn:hover {
    background: var(--blue);
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-12px);
    }
}

.hero-visual-card {
    animation: float 4s ease-in-out infinite;
}

.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.letters-grid .letter-card:nth-child(1) {
    animation-delay: 0.1s;
}

.letters-grid .letter-card:nth-child(2) {
    animation-delay: 0.2s;
}

.letters-grid .letter-card:nth-child(3) {
    animation-delay: 0.3s;
}

.letters-grid .letter-card:nth-child(4) {
    animation-delay: 0.4s;
}

.letters-grid .letter-card:nth-child(5) {
    animation-delay: 0.5s;
}

/* ── WAVE SVG ── */
.wave-path {
    animation: waveDraw 3s ease-in-out infinite alternate;
}

@keyframes waveDraw {
    0% {
        d: path("M0,60 Q50,20 100,60 T200,60 T300,60 T400,60");
    }

    100% {
        d: path("M0,60 Q50,100 100,60 T200,60 T300,60 T400,60");
    }
}

/* ── HERO SLIDER ── */
.hero-slider-wrapper {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 550px;
    overflow: hidden;
    background-color: #0c101b;
}

.hero-slider-track {
    display: flex;
    width: 300%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.hero-slide-item {
    width: 33.3333%;
    height: 100%;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
}

.hero-slide-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-slider-wrapper .hero-grid {
    position: relative;
    width: 100%;
    box-sizing: border-box;
    z-index: 2;
    display: flex;
    justify-content: flex-start;
    padding-left: 5%;
    padding-right: 10%;
}

.hero-slider-wrapper .hero-content h1 {
    color: #ffffff;
    font-size: 3.2rem;
    line-height: 1.35;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0;
}

.hero-slider-wrapper .hero-content h1 em {
    color: #31E3B2;
    font-style: normal;
}

.hitech-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #ffffff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.hitech-arrow:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: #ffffff;
}

.hitech-prev {
    left: 30px;
}

.hitech-next {
    right: 30px;
}

.hitech-dots {
    position: absolute;
    bottom: 35px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.hitech-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
}

.hitech-dot.active {
    background: #ffffff;
    width: 32px;
    border-radius: 6px;
}

/* ── HISTORY SECTION ── */
.history-section {
    padding: 120px 0;
    background: #f3f3f3;
    overflow: hidden;
}

.history-inner {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

.history-section .section-header {
    margin-bottom: 70px;
}

.history-group {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 70px;
}

.history-group+.history-group {
    margin-top: 140px;
}

.history-visual,
.history-list {
    width: calc(50% - 35px);
}

.history-visual {
    position: relative;
}

.history-visual img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.history-range {
    position: absolute;
    left: 24px;
    bottom: -18px;
    font-size: 96px;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -3px;
    color: #53a318;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
    will-change: transform, opacity;
}

.history-range.show {
    opacity: 1;
    transform: translateY(0);
}

.history-list {
    padding-top: 10px;
}

.history-year-block {
    margin-bottom: 40px;
}

.history-year-row {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.history-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #53a318;
    flex: 0 0 10px;
}

.history-year {
    font-size: 39px;
    font-weight: 800;
    color: #53a318;
    line-height: 1;
}

.history-item {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 16px;
    margin-bottom: 10px;
    padding-left: 24px;
}

.history-month {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.45;
    color: #111;
}

.history-text {
    font-size: 29px;
    font-weight: 400;
    line-height: 1.45;
    color: #111;
    word-break: keep-all;
}

.history-slide-left,
.history-slide-right {
    opacity: 0;
    transition: opacity 0.9s ease, transform 0.9s ease;
    will-change: transform, opacity;
}

.history-slide-left {
    transform: translateX(-60px);
}

.history-slide-right {
    transform: translateX(60px);
}

.history-slide-left.show,
.history-slide-right.show {
    opacity: 1;
    transform: translateX(0);
}

.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
    will-change: transform, opacity;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.history-year-block {
    transition: transform 0.35s ease;
}

.history-year-block:hover {
    transform: translateX(8px);
}

.history-item:hover .history-month,
.history-item:hover .history-text {
    color: #53a318;
    transition: color 0.25s ease;
}


/* ══════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════ */
@media (max-width: 1280px) {
    .history-inner {
        max-width: 92%;
    }

    .history-range {
        font-size: 72px;
    }

    .history-year {
        font-size: 32px;
    }

    .history-month {
        font-size: 22px;
    }

    .history-text {
        font-size: 22px;
    }
}

@media (max-width: 1024px) {
    .letters-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 4px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .stats-inner {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .history-group,
    .history-group.history-group-bottom {
        flex-direction: column;
        gap: 45px;
    }

    .history-group.history-group-bottom .history-list {
        order: 2;
    }

    .history-group.history-group-bottom .history-visual {
        order: 1;
    }

    .history-visual,
    .history-list {
        width: 100%;
    }

    .history-range {
        font-size: 60px;
        left: 18px;
        bottom: -12px;
    }

    .history-group+.history-group {
        margin-top: 100px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        order: -1;
    }

    .hero-visual-card {
        max-width: 320px;
    }

    .letters-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 0;
    }

    .letter-card {
        padding: 24px 8px 20px;
    }

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

    .stats-inner {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    /* Products 모바일 */
    .ps-row,
    .ps-row.ps-right {
        grid-template-columns: 1fr;
        grid-template-rows: 190px auto;
        height: auto !important;
    }

    .ps-img-wrap,
    .ps-row.ps-right .ps-img-wrap {
        order: 1 !important;
        height: 190px;
        width: 100%;
    }

    .ps-row.ps-left .ps-img-wrap::after,
    .ps-row.ps-right .ps-img-wrap::after {
        display: none;
    }

    .ps-text,
    .ps-row.ps-right .ps-text {
        order: 2 !important;
        align-items: flex-start !important;
        text-align: left !important;
        padding: 24px 20px;
    }

    .hero-slider-wrapper {
        height: 55vh;
    }

    .hero-slider-wrapper .hero-content h1 {
        font-size: 2.2rem;
    }

    .hitech-arrow {
        width: 42px;
        height: 42px;
        font-size: 16px;
    }

    .history-section {
        padding: 80px 0;
    }

    .history-section .section-header {
        margin-bottom: 50px;
    }

    .history-range {
        font-size: 42px;
        letter-spacing: -2px;
    }

    .history-year {
        font-size: 24px;
    }

    .history-item {
        grid-template-columns: 44px 1fr;
        gap: 12px;
        padding-left: 18px;
    }

    .history-month {
        font-size: 17px;
    }

    .history-text {
        font-size: 17px;
        line-height: 1.6;
    }

    .history-dot {
        width: 8px;
        height: 8px;
        flex-basis: 8px;
    }
}

@media (max-width: 640px) {
    .letters-section {
        padding: 48px 16px;
    }

    .section-header {
        margin-bottom: 36px;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .section-header p {
        font-size: 0.85rem;
    }

    .letters-grid {
        gap: 7px;
    }

    .letter-card {
        padding: 16px 6px 14px;
        border-radius: 12px;
        min-width: 0;
    }

    .letter-big {
        font-size: 1.9rem;
    }

    .letter-label {
        font-size: 0.55rem;
        margin-top: 5px;
        letter-spacing: 0.02em;
    }

    .hvacr-panel {
        padding: 20px 18px;
        gap: 16px;
        flex-wrap: wrap;
    }

    .panel-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
        border-radius: 12px;
    }

    .panel-divider {
        display: none;
    }

    .panel-title {
        font-size: 0.95rem;
        margin-bottom: 5px;
    }

    .panel-desc {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .letters-grid {
        gap: 0;
    }

    .letter-card {
        padding: 16px 4px 12px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

    .hero-btns {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        text-align: center;
    }
}

@media (max-width: 380px) {
    .letter-big {
        font-size: 1.5rem;
    }

    .letter-label {
        font-size: 0.48rem;
    }

    .letters-grid {
        gap: 5px;
    }

    .letter-card {
        padding: 14px 4px 12px;
    }
}

/* =================================================================
   PREMIUM PRODUCTS SECTION (사선 지그재그 교차 + 고도화 인터랙션)
================================================================= */
.premium-products-section {
    width: 100%;
    padding: 80px 0;
    background-color: #fafbfc;
    display: block;
}

/* 16:9 기준 중앙 약 2/3 크기 레이아웃 제어 */
.pps-container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    display: block;
}

/* 하나의 상품 행 (전체가 링크) */
.pps-row {
    display: block;
    width: 100%;
    height: 320px;
    margin-bottom: 40px;
    background-color: #ffffff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    border-radius: 16px;
    border: 1px solid #f1f5f9;
    /* 카드 경계선 명확화 */
    overflow: hidden;
    /* 자식 요소 마스킹 */
    text-decoration: none !important;
    position: relative;

    /* 하드웨어 가속 유도로 하이테크 느낌의 부드러운 트랜지션 구현 */
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        box-shadow 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        border-color 0.4s ease;

    /* 브라우저 외곽선 렌더링 및 사선 clip-path 버그 방지 */
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -webkit-transform: translate3d(0, 0, 0);
    -moz-transform: translate3d(0, 0, 0);
}

.pps-row:last-child {
    margin-bottom: 0;
}

/* 반반 분할 기본 구조 */
.pps-split-box {
    position: absolute;
    top: 0;
    height: 100%;
}

/* -----------------------------------------------------------------
   [1, 3번째 행] 이미지가 왼쪽 ( / 모양 사선)
----------------------------------------------------------------- */
.pps-row .pps-img-side {
    left: 0;
    width: 53%;
    z-index: 2;
    overflow: hidden;
    /* 이미지 확대를 위한 오버플로우 차단 */
    clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
    -webkit-clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.pps-row .pps-text-side {
    right: 0;
    width: 55%;
    z-index: 1;
    background: #ffffff;
}

/* -----------------------------------------------------------------
   [2번째 행] 이미지가 오른쪽 ( \ 모양 사선)
----------------------------------------------------------------- */
.pps-row.pps-reverse .pps-img-side {
    left: auto;
    right: 0;
    width: 53%;
    z-index: 2;
    overflow: hidden;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 15% 100%);
    -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%, 15% 100%);
}

.pps-row.pps-reverse .pps-text-side {
    right: auto;
    left: 0;
    width: 55%;
    z-index: 1;
    background: #ffffff;
}

/* -----------------------------------------------------------------
   이미지 배경 및 콘텐츠 정렬
----------------------------------------------------------------- */
.pps-img-bg {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    /* 부드러운 줌 아웃 서서히 일어나는 cubic-bezier 모션 적용 */
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

/* 텍스트 컨테이너 */
.pps-text-content {
    box-sizing: border-box;
    height: 100%;
    padding: 50px 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

/* 1, 3번째 행 텍스트 여백 (왼쪽에 사선 이미지가 있으므로 왼쪽 여백 넓게) */
.pps-row .pps-text-side .pps-text-content {
    padding-left: 85px;
    padding-right: 50px;
}

/* 2번째 행 텍스트 여백 (오른쪽에 사선 이미지가 있으므로 오른쪽 여백 넓게) */
.pps-row.pps-reverse .pps-text-side .pps-text-content {
    padding-left: 60px;
    padding-right: 85px;
}

.pps-title {
    font-size: 24px;
    font-weight: 700;
    color: #2563eb;
    margin: 0 0 14px 0;
    line-height: 1.2;
}

.pps-desc {
    font-size: 14px;
    color: #64748b;
    line-height: 1.6;
    margin: 0;
    max-width: 90%;
}

/* 더보기 화살표 버튼 (기본형 제어) */
.pps-more-btn {
    position: absolute;
    bottom: 40px;
    right: 50px;
    width: 44px;
    height: 44px;
    background-color: #f1f5f9;
    color: #334155;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

/* 역방향 카드일 경우 버튼 위치 왼쪽 배치 보존 */
.pps-row.pps-reverse .pps-more-btn {
    right: auto;
    left: 50px;
}

/* =================================================================
   INTERACTION (호버 애니메이션 - 중복 고도화 제거 본)
================================================================= */
.pps-row:hover {
    transform: translateY(-8px);
    /* 조금 더 입체감 있게 띄움 */
    box-shadow: 0 12px 30px rgba(0, 86, 179, 0.12);
    /* 은은한 블루톤 심도 섀도우 */
    border-color: #cbd5e1;
}

/* 모서리 고정된 상태로 내부 이미지만 고급스럽게 1.06배 확대 */
.pps-row:hover .pps-img-bg {
    transform: scale(1.06);
}

/* 호버 시 화살표가 브랜드 블루로 채워지며 트랜스레이트 액션 */
.pps-row:hover .pps-more-btn {
    background-color: #0056b3;
    color: #ffffff;
    transform: translateX(6px);
}

/* 역방향 카드의 경우 화살표가 왼쪽으로 튕기는 인터랙션 예외 처리 */
.pps-row.pps-reverse:hover .pps-more-btn {
    transform: translateX(-6px);
}

/* =================================================================
   RESPONSIVE (모바일 대응)
================================================================= */
@media (max-width: 768px) {
    .pps-row {
        height: auto;
    }

    .pps-split-box {
        position: relative;
        width: 100% !important;
        height: 200px;
        clip-path: none !important;
        -webkit-clip-path: none !important;
    }

    .pps-text-content {
        padding: 30px !important;
    }

    .pps-desc {
        max-width: 100%;
        margin-bottom: 40px;
    }

    .pps-more-btn {
        bottom: 25px;
        right: 30px !important;
        left: auto !important;
        transform: none !important;
        /* 모바일 리버스 모션 상쇄 */
    }
}

/* =================================================================
   PREMIUM PRODUCTS SECTION (스크롤 등장 + 사선 교차 + 호버 애니메이션 통합본)
================================================================= */
.premium-products-section {
    width: 100%;
    padding: 80px 0;
    background-color: #fafbfc;
    display: block;
}

/* 16:9 기준 중앙 약 2/3 크기 레이아웃 제어 */
.pps-container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    display: block;
}

/* 하나의 상품 행 (전체가 링크) */
.pps-row {
    display: block;
    width: 100%;
    height: 320px;
    margin-bottom: 40px;
    background-color: #ffffff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    border-radius: 16px;
    border: 1px solid #f1f5f9;
    overflow: hidden;
    /* 자식 요소 마스킹 */
    text-decoration: none !important;
    position: relative;

    /* [핵심] 기존 스크롤 애니메이션(.fade-up)과 호버 효과(transform, box-shadow)가 부드럽게 이어지도록 cubic-bezier 통합 설정 */
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1),
        box-shadow 0.6s cubic-bezier(0.25, 1, 0.5, 1),
        border-color 0.4s ease,
        opacity 0.8s ease-out;

    /* 브라우저 외곽선 렌더링 및 사선 clip-path 버그 방지 */
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -webkit-transform: translate3d(0, 0, 0);
    -moz-transform: translate3d(0, 0, 0);
}

.pps-row:last-child {
    margin-bottom: 0;
}

/* -----------------------------------------------------------------
   ★ [추가] 스크롤 시 처음 보일 때 자연스럽게 나타나는 빌드업 규칙
   (기존 .fade-up과 .visible 메커니즘을 카드 호버 속성과 결합 시 깨지지 않게 보정)
----------------------------------------------------------------- */
.pps-row.fade-up {
    opacity: 0;
    transform: translateY(40px) translate3d(0, 0, 0);
    will-change: transform, opacity;
}

.pps-row.fade-up.visible {
    opacity: 1;
    transform: translateY(0) translate3d(0, 0, 0);
}

/* =================================================================
   INTERACTION (화면에 등장한 후 '마우스 호버' 할 때의 모션)
================================================================= */
/* 반드시 화면에 등장(.visible)한 상태에서만 호버가 작동해야 모션이 꼬이지 않음 */
.pps-row.fade-up.visible:hover {
    transform: translateY(-8px) translate3d(0, 0, 0);
    /* 자연스럽게 위로 슥 떠오름 */
    box-shadow: 0 16px 35px rgba(0, 86, 179, 0.12);
    /* 브랜드 블루톤 심도 섀도우 */
    border-color: #cbd5e1;
}

/* 모서리 고정된 상태로 내부 이미지만 고급스럽게 1.06배 확대 */
.pps-row:hover .pps-img-bg {
    transform: scale(1.06);
}

/* 호버 시 화살표가 브랜드 블루로 채워지며 오른쪽으로 이동 */
.pps-row:hover .pps-more-btn {
    background-color: #0056b3;
    color: #ffffff;
    transform: translateX(6px);
}

/* 역방향 카드의 경우 화살표가 왼쪽으로 튕기는 인터랙션 예외 처리 */
.pps-row.pps-reverse:hover .pps-more-btn {
    transform: translateX(-6px);
}

/* -----------------------------------------------------------------
   반반 분할 및 사선 구조 (기존 유지)
----------------------------------------------------------------- */
.pps-split-box {
    position: absolute;
    top: 0;
    height: 100%;
}

/* [1, 3번째 행] 이미지가 왼쪽 ( / 모양 사선) */
.pps-row .pps-img-side {
    left: 0;
    width: 53%;
    z-index: 2;
    overflow: hidden;
    clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
    -webkit-clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.pps-row .pps-text-side {
    right: 0;
    width: 55%;
    z-index: 1;
    background: #ffffff;
}

/* [2번째 행] 이미지가 오른쪽 ( \ 모양 사선) */
.pps-row.pps-reverse .pps-img-side {
    left: auto;
    right: 0;
    width: 53%;
    z-index: 2;
    overflow: hidden;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 15% 100%);
    -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%, 15% 100%);
}

.pps-row.pps-reverse .pps-text-side {
    right: auto;
    left: 0;
    width: 55%;
    z-index: 1;
    background: #ffffff;
}

.pps-img-bg {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.pps-text-content {
    box-sizing: border-box;
    height: 100%;
    padding: 50px 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.pps-row .pps-text-side .pps-text-content {
    padding-left: 85px;
    padding-right: 50px;
}

.pps-row.pps-reverse .pps-text-side .pps-text-content {
    padding-left: 60px;
    padding-right: 85px;
}

.pps-title {
    font-size: 24px;
    font-weight: 700;
    color: #2563eb;
    margin: 0 0 14px 0;
    line-height: 1.2;
}

.pps-desc {
    font-size: 14px;
    color: #64748b;
    line-height: 1.6;
    margin: 0;
    max-width: 90%;
}

.pps-more-btn {
    position: absolute;
    bottom: 40px;
    right: 50px;
    width: 44px;
    height: 44px;
    background-color: #f1f5f9;
    color: #334155;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

.pps-row.pps-reverse .pps-more-btn {
    right: auto;
    left: 50px;
}

/* =================================================================
   RESPONSIVE (모바일 대응)
================================================================= */
@media (max-width: 768px) {
    .pps-row {
        height: auto;
    }

    .pps-split-box {
        position: relative;
        width: 100% !important;
        height: 200px;
        clip-path: none !important;
        -webkit-clip-path: none !important;
    }

    .pps-text-content {
        padding: 30px !important;
    }

    .pps-desc {
        max-width: 100%;
        margin-bottom: 40px;
    }

    .pps-more-btn {
        bottom: 25px;
        right: 30px !important;
        left: auto !important;
        transform: none !important;
    }
}

.partners-section {
    padding: 40px 20px 100px;
    background: #fff;
    text-align: center;
}

.partners-inner {
    max-width: 900px;
    margin: 0 auto;
    border-top: 1px solid #f1f5f9;
    padding-top: 60px;
}

.partners-title {
    font-size: 13px;
    color: #94a3b8;
    letter-spacing: 0.15em;
    font-weight: 600;
    margin-bottom: 30px;
}

.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 100px;
}

.partner-logo {
    width: 100%;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.partner-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: grayscale(100%) opacity(40%);
    transition: filter 0.4s ease, transform 0.4s ease;
}

.partner-logo:hover img {
    filter: grayscale(0%) opacity(100%);
    transform: translateY(-3px);
}