/* ============================================
   CSS Variables - Black & White Color Palette
   ============================================ */
:root {
    /* Black & White Theme */
    --color-primary: #000000;
    --color-primary-dark: #000000;
    --color-primary-light: #1a1a1a;
    
    /* Secondary Colors */
    --color-secondary: #2a2a2a;
    --color-secondary-dark: #1a1a1a;
    --color-secondary-light: #3a3a3a;
    
    /* Accent Colors */
    --color-accent: #000000;
    --color-accent-dark: #000000;
    --color-accent-light: #1a1a1a;
    
    /* Neutral Colors */
    --color-dark: #000000;
    --color-dark-light: #1a1a1a;
    --color-gray: #666666;
    --color-gray-light: #999999;
    --color-gray-lighter: #cccccc;
    --color-light: #f5f5f5;
    --color-white: #ffffff;
    
    /* Text Colors */
    --text-primary: #000000;
    --text-secondary: #333333;
    --text-light: #666666;
    --text-white: #ffffff;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-dark: #000000;
    
    /* Border Colors */
    --border-color: #e0e0e0;
    --border-color-dark: #cccccc;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-primary: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Tilt Warp', cursive;
    
    /* Font Weights */
    --font-weight-normal: 500;
    --font-weight-medium: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Z-index */
    --z-header: 1000;
    --z-mobile-menu: 2000;
    --z-side-nav: 1500;
    --z-overlay: 1900;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    letter-spacing: -0.02em;
}

p, span, a, li {
    font-weight: 500;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

ul, ol {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   Header Styles
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    z-index: var(--z-header);
    transition: var(--transition-base);
}

.header.scrolled {
    background: var(--color-white);
    border-bottom-color: transparent;
    box-shadow: var(--shadow-md);
}

.header__container {
    max-width: 1700px;
    height: 90px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header__logo a {
    display: block;
    width: auto;
    height: auto;
    background: none;
    border: none;
    position: relative;
    padding: 0;
}

.header__logo a::before {
    content: 'ARO.GURU.';
    position: static;
    display: block;
    color: var(--color-white);
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: 18px;
    letter-spacing: 1px;
    transform: none;
}

.header.scrolled .header__logo a::before {
    color: var(--color-primary);
}

.nav__list {
    display: flex;
    align-items: center;
    height: 100%;
    gap: 70px;
}

.nav__item {
    position: relative;
}

.nav__link {
    font-size: 17px;
    color: var(--color-white);
    height: 100%;
    display: flex;
    align-items: center;
    position: relative;
    transition: var(--transition-base);
}

.header.scrolled .nav__link {
    color: var(--text-secondary);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-base);
}

.nav__link:hover::after {
    width: 140%;
}

/* 서브메뉴 제거됨 */

.header__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 23px;
    height: 18px;
}

.header__toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    transition: var(--transition-base);
}

.header.scrolled .header__toggle span {
    background: var(--text-primary);
}

/* ============================================
   Mobile Menu
   ============================================ */
.mobile-menu {
    position: fixed;
    right: -640px;
    top: 0;
    width: 540px;
    height: 100vh;
    background: var(--color-light);
    padding: 160px 70px 70px;
    z-index: var(--z-mobile-menu);
    transition: var(--transition-base);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu__close {
    position: absolute;
    right: 50px;
    top: 60px;
    width: 32px;
    height: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0;
}

.mobile-menu__close span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    border-radius: 3px;
    transition: var(--transition-base);
}

.mobile-menu__close span:first-child {
    transform: rotate(45deg);
}

.mobile-menu__close span:last-child {
    transform: rotate(-45deg);
    margin-top: -2px;
}

.mobile-menu__list {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.mobile-menu__list li a {
    font-size: 26px;
    font-weight: 700;
    color: rgba(0, 0, 0, 0.5);
    transition: var(--transition-base);
}

.mobile-menu__list li a:hover {
    color: var(--text-primary);
}

.mobile-menu__overlay {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: var(--z-overlay);
    display: none;
}

.mobile-menu__overlay.active {
    display: block;
}

/* ============================================
   Side Navigation
   ============================================ */
.side-nav {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: var(--z-side-nav);
}

.side-nav__menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.side-nav__call {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 20px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50px 0 0 50px;
    font-size: 14px;
    transition: var(--transition-base);
}

.side-nav__call:hover {
    background: var(--color-primary-dark);
    padding-right: 30px;
}

.side-nav__list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.side-nav__list li a {
    display: block;
    padding: 10px 15px;
    color: rgba(0, 0, 0, 0.4);
    font-size: 14px;
    transition: var(--transition-base);
    font-weight: 400;
}

.side-nav__list li a:hover {
    color: var(--color-primary);
    padding-left: 20px;
    opacity: 1;
}

/* body가 scrolled 상태가 아닐 때(헤더가 투명할 때) 흰색 텍스트 */
body:not(.scrolled) .side-nav__list li a {
    color: rgba(255, 255, 255, 0.6);
}

body:not(.scrolled) .side-nav__list li a:hover {
    color: rgba(255, 255, 255, 0.9);
    opacity: 1;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    overflow: hidden;
    height: 937px;
}

.hero__swiper {
    width: 100%;
    height: 100%;
}

.hero__slide {
    height: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    border-radius: 0 0 0 200px;
    position: relative;
}

.hero__slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.15);
}

.hero__slide--1 {
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
}

.hero__slide--2 {
    background: linear-gradient(135deg, #1a1a1a 0%, #000000 100%);
}

.hero__slide--3 {
    background: linear-gradient(135deg, #000000 0%, #2a2a2a 100%);
}

.hero__slide--4 {
    background: linear-gradient(135deg, #2a2a2a 0%, #000000 100%);
}

.hero__content {
    position: absolute;
    left: 50%;
    top: 27%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1700px;
    z-index: 1;
    padding: 0 60px;
}

/* PREV/NEXT 버튼 제거됨 */

.hero__title-area {
    text-align: center;
    margin-bottom: 40px;
}

.hero__title {
    width: 542px;
    height: 202px;
    margin: 0 auto 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 120px;
    font-weight: 700;
    color: var(--color-white);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    letter-spacing: 10px;
}

.hero__title::before {
    content: 'ARO.GURU.';
    font-family: var(--font-heading);
}

.hero__description {
    font-size: 19px;
    font-weight: 400;
    line-height: 1.84;
    color: var(--color-white);
}

.hero__pagination {
    position: absolute;
    right: 0;
    top: 5%;
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.hero__pagination .swiper-pagination-bullet {
    position: relative;
    width: 10px;
    height: 10px;
    background: var(--color-white);
    border-radius: 50%;
    opacity: 1;
    margin: 0;
}

.hero__pagination .swiper-pagination-bullet::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-white);
    opacity: 0;
    transition: var(--transition-base);
}

.hero__pagination .swiper-pagination-bullet-active::after {
    opacity: 1;
}

.hero__goals {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.5);
    z-index: 1;
}

.hero__goals-container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 60px 20px 70px;
    display: flex;
    justify-content: space-between;
    gap: 40px;
}

.hero__goal {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 35px;
}

.hero__goal-icon {
    width: 120px;
    height: 80px;
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
}

.hero__goal:hover .hero__goal-icon {
    background: var(--color-primary);
    transform: scale(1.05);
}

.hero__goal-icon-text {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 400;
    color: var(--color-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-shadow: 0 0 0 rgba(0, 0, 0, 0.1);
    -webkit-text-stroke: 0.3px transparent;
}

.hero__goal:hover .hero__goal-icon-text {
    color: var(--color-white);
}

.hero__goal-icon--1,
.hero__goal-icon--2,
.hero__goal-icon--3 {
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    border-radius: 12px;
}

.hero__goal-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 8px;
}

.hero__goal-desc {
    font-size: 15px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   About Section
   ============================================ */
.about {
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
    padding: 145px 0 120px;
}

.about__line {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border-color);
    max-width: 1500px;
    margin: 0 auto;
}

.about__container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 60px;
}

.about__content {
    width: 45%;
}

.about__title {
    font-family: var(--font-heading);
    font-size: 65px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.11;
    margin-bottom: 40px;
}

.about__title span {
    position: relative;
}

.about__title span::after {
    content: '';
    display: inline-block;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--color-primary);
    vertical-align: top;
    margin-left: 5px;
}

.about__title {
    font-family: var(--font-heading);
}

.about__description {
    font-size: 16px;
    font-weight: 300;
    color: var(--text-light);
    line-height: 1.88;
    margin-bottom: 95px;
}

.about__description strong {
    display: block;
    font-size: 32px;
    font-weight: 700;
    line-height: 1.56;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.about__btn {
    display: inline-block;
    width: 200px;
    padding: 15px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-white);
    text-align: center;
    border-radius: 27px;
    background: var(--color-dark);
    transition: var(--transition-base);
    cursor: pointer;
    text-decoration: none;
    border: none;
}

.about__btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.about__gallery {
    width: 46%;
    display: flex;
    flex-wrap: wrap;
    gap: 35px;
}

.about__gallery-row {
    display: flex;
    gap: 35px;
    width: 100%;
}

.about__gallery-row:first-child .about__gallery-item:last-child {
    margin-top: -75px;
}

.about__gallery-row:last-child {
    margin-top: 35px;
}

.about__gallery-item {
    flex: 1;
    overflow: hidden;
    border-radius: 20px;
    position: relative;
}

.about__gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-base);
}

.about__gallery-item:hover img {
    transform: scale(1.1);
}

/* ============================================
   Business Section
   ============================================ */
.business {
    position: relative;
    overflow: hidden;
    z-index: 2;
}

.business__line {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border-color);
    max-width: 1500px;
    margin: 0 auto;
}

.business__container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 75px 60px;
}

.business__header {
    width: 100%;
    background: var(--color-primary);
    border-radius: 0 20px 0 0;
    padding: 75px 60px;
    margin-bottom: 60px;
    position: relative;
    z-index: 1;
}

.business__title {
    font-family: var(--font-heading);
    font-size: 65px;
    font-weight: 400;
    color: var(--color-white);
    line-height: 1.11;
    margin-bottom: 40px;
    position: relative;
}

.business__title::after {
    content: '';
    display: inline-block;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--color-white);
    vertical-align: top;
    margin-left: 5px;
}

.business__description {
    font-size: 16px;
    font-weight: 300;
    color: var(--color-white);
    line-height: 1.88;
}

.business__list {
    display: flex;
    width: 100%;
    position: relative;
    z-index: 2;
    gap: 0;
}

.business__item {
    flex: 1;
    border-bottom: 1px solid transparent;
}

.business__item--1 {
    background: var(--color-primary);
    border-radius: 20px 0 0 20px;
}

.business__item--2 {
    background: var(--color-white);
    border: 1px solid var(--border-color-dark);
    border-left: none;
    border-right: none;
}

.business__item--3 {
    background: var(--color-dark);
    border-radius: 0 20px 20px 0;
}

.business__link {
    display: block;
    padding: 45px 55px 65px;
    height: 100%;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.business__category {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.business__category-text {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 400;
    color: var(--color-white);
    letter-spacing: 1px;
}

.business__item--2 .business__category-text {
    color: var(--text-light);
}

.business__icon-plus {
    width: 60px;
    height: 60px;
    background: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    border: 2px solid var(--color-primary);
}

.business__item--2 .business__icon-plus {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.business__icon-plus i {
    color: var(--color-primary);
    font-size: 20px;
    transition: var(--transition-base);
}

.business__item--2 .business__icon-plus i {
    color: var(--color-white);
}

.business__item:hover .business__icon-plus {
    transform: rotate(90deg);
}

.business__content {
    text-align: left;
    margin-top: 0;
}

/* business__icon 제거됨 */

.business__item-title {
    font-weight: 700;
    color: var(--color-white);
    display: block;
}

.business__item--1 .business__item-title {
    font-size: 35px;
}

.business__item--1 .business__item-title span {
    font-size: 18px;
    font-weight: 300;
}

.business__item--2 .business__item-title {
    font-size: 35px;
    color: var(--text-light);
    position: relative;
    top: 0;
}

.business__item--3 .business__item-title {
    font-size: 35px;
}

.business__item--2 .business__item-title span {
    font-size: 18px;
    font-weight: 300;
}

.business__item--3 .business__item-title span {
    font-size: 18px;
    font-weight: 300;
}

/* ============================================
   ESG Section
   ============================================ */
.esg {
    position: relative;
    overflow: hidden;
    z-index: 1;
    margin-top: -120px;
    padding: 250px 0 160px;
}

.esg__lines {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    max-width: 1500px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    z-index: -1;
}

.esg__line {
    width: 1px;
    height: 100%;
    background: var(--border-color);
    position: relative;
}

.esg__line:first-child::before,
.esg__line:first-child::after,
.esg__line:last-child::before {
    content: '';
    position: absolute;
    left: -2px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
}

.esg__line:first-child::before {
    background: var(--color-accent);
    top: 17%;
}

.esg__line:first-child::after {
    background: var(--text-light);
    bottom: 9%;
}

.esg__line:last-child::before {
    background: var(--color-primary);
    left: auto;
    right: -2px;
    top: 30%;
}

.esg__container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 60px;
}

.esg__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 45px;
}

.esg__title {
    font-family: var(--font-heading);
    font-size: 65px;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.11;
    margin-bottom: 15px;
    position: relative;
}

.esg__title::after {
    content: '';
    display: inline-block;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--color-primary);
    vertical-align: top;
    margin-left: 5px;
}

.esg__description {
    font-size: 16px;
    font-weight: 300;
    color: var(--text-light);
    line-height: 1.88;
}

.esg__btn {
    display: inline-block;
    width: 200px;
    padding: 15px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-white);
    text-align: center;
    border-radius: 27px;
    background: var(--color-dark);
    transition: var(--transition-base);
    cursor: pointer;
    text-decoration: none;
    border: none;
}

.esg__btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.esg__card-placeholder {
    width: 100%;
    height: 300px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--border-color);
    border-radius: 20px;
}

.esg__card-text {
    font-family: var(--font-heading);
    font-size: 52px;
    font-weight: 400;
    color: var(--color-primary);
    letter-spacing: 4px;
    text-transform: uppercase;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-shadow: 0 0 0 rgba(0, 0, 0, 0.1);
    -webkit-text-stroke: 0.5px transparent;
}

.esg__management {
    display: flex;
    justify-content: space-between;
    gap: 40px;
}

.esg__card {
    flex: 1;
    position: relative;
}

.esg__card-image {
    overflow: hidden;
    border-radius: 20px;
    margin-bottom: 30px;
}

.esg__card-image img {
    width: 100%;
    height: auto;
    transition: var(--transition-base);
}

.esg__card:hover .esg__card-image img {
    transform: scale(1.05);
}

.esg__card-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.esg__card-description {
    font-size: 16px;
    font-weight: 300;
    color: var(--text-light);
    line-height: 1.88;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-secondary);
    padding: 60px 0 40px;
}

.footer__container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 60px;
}

.footer__links {
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.footer__link-list {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.footer__link-list li a {
    font-size: 16px;
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.footer__link-list li a:hover {
    color: var(--color-primary);
}

.footer__info-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 30px;
}

.footer__company p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 5px;
}

.footer__logo {
    display: block;
    width: auto;
    height: auto;
    background: none;
    border: none;
    position: relative;
    padding: 0;
}

.footer__logo::before {
    content: 'ARO.GURU.';
    position: static;
    display: block;
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: 18px;
    letter-spacing: 1px;
    transform: none;
}

.footer__copyright {
    font-size: 14px;
    color: var(--text-light);
    text-align: center;
}

.footer__copyright a {
    color: var(--color-primary);
}

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

/* ============================================
   Top Button
   ============================================ */
.top-btn {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    border: none;
}

.top-btn.visible {
    opacity: 1;
    visibility: visible;
}

.top-btn:hover {
    background: var(--color-primary-dark);
    transform: translateY(-5px);
}

/* ============================================
   Responsive Design
   ============================================ */
@media screen and (max-width: 1800px) {
    .header__container,
    .hero__content,
    .about__container,
    .business__container,
    .esg__container,
    .footer__container {
        padding-left: 20px;
        padding-right: 20px;
    }
}

@media screen and (max-width: 1500px) {
    .about__container {
        flex-direction: column;
    }
    
    .about__content,
    .about__gallery {
        width: 100%;
    }
    
    .about__gallery-row:first-child .about__gallery-item:last-child {
        margin-top: 0;
    }
}

@media screen and (max-width: 1300px) {
    .nav__list {
        gap: 45px;
    }
}

@media screen and (max-width: 1200px) {
    .hero__goals-container {
        flex-direction: column;
        gap: 30px;
    }
    
    .hero__goal {
        flex-direction: column;
        text-align: center;
    }
    
    .business__header {
        width: 100%;
        border-radius: 0;
    }
    
    .business__list {
        width: 100%;
        flex-direction: column;
    }
    
    .business__item--1 {
        border-radius: 0;
    }
    
    .esg__management {
        flex-direction: column;
    }
}

@media screen and (max-width: 1023px) {
    .header__container {
        height: 60px;
        padding: 0 20px;
    }
    
    .nav {
        display: none;
    }
    
    .header__toggle {
        display: flex;
    }
    
    .hero {
        height: 720px;
    }
    
    .hero__slide {
        border-radius: 0;
    }
    
    .hero__content {
        top: 15%;
        padding: 0 20px;
    }
    
    /* PREV/NEXT 버튼 제거됨 */
    
    .hero__title {
        width: auto;
        max-width: 300px;
        height: auto;
        margin: 0 auto 20px;
        font-size: 80px;
    }
    
    .hero__description {
        font-size: 17px;
        padding: 0 10px;
    }
    
    .hero__pagination {
        position: static;
        flex-direction: row;
        justify-content: center;
        gap: 30px;
        margin-top: 70px;
    }
    
    .hero__goals-container {
        padding: 35px 20px;
        flex-wrap: wrap;
    }
    
    .hero__goal {
        min-width: 200px;
    }
    
    .about {
        padding: 80px 0;
    }
    
    .about__container {
        padding: 0 20px;
        flex-direction: column;
    }
    
    .about__title {
        font-size: 48px;
    }
    
    .about__description {
        font-size: 15px;
    }
    
    .about__description strong {
        font-size: 24px;
    }
    
    .about__gallery {
        width: 100%;
        margin-top: 40px;
    }
    
    .about__gallery-row {
        flex-direction: column;
    }
    
    .about__gallery-row:first-child .about__gallery-item:last-child {
        margin-top: 0;
    }
    
    .business__container {
        padding: 60px 20px;
    }
    
    .business__header {
        padding: 50px 20px;
        margin-bottom: 40px;
    }
    
    .business__title {
        font-size: 48px;
    }
    
    .business__description {
        font-size: 15px;
    }
    
    .business__list {
        flex-direction: column;
        width: 100%;
    }
    
    .business__item {
        width: 100%;
    }
    
    .business__item--1,
    .business__item--3 {
        border-radius: 0;
    }
    
    .business__item--2 {
        border-left: none;
        border-right: none;
    }
    
    .business__link {
        padding: 40px 20px;
    }
    
    .business__item-title {
        font-size: 28px;
    }
    
    .business__item-title span {
        font-size: 16px;
    }
    
    .esg {
        padding: 80px 0;
        margin-top: 0;
    }
    
    .esg__container {
        padding: 0 20px;
    }
    
    .esg__header {
        flex-direction: column;
        align-items: flex-start;
        gap: 30px;
    }
    
    .esg__title {
        font-size: 48px;
    }
    
    .esg__card-text {
        font-size: 36px;
    }
}

@media screen and (max-width: 767px) {
    .mobile-menu {
        width: 100%;
        right: -100%;
    }
    
    .hero {
        height: 600px;
    }
    
    .hero__content {
        top: 10%;
        padding: 0 15px;
    }
    
    .hero__title {
        width: auto;
        max-width: 250px;
        height: auto;
        font-size: 60px;
        margin-bottom: 15px;
    }
    
    .hero__description {
        font-size: 15px;
        line-height: 1.6;
    }
    
    .hero__pagination {
        gap: 20px;
        margin-top: 50px;
    }
    
    .hero__goals-container {
        padding: 25px 15px;
        flex-direction: column;
        gap: 20px;
    }
    
    .hero__goal {
        flex-direction: row;
        justify-content: flex-start;
        text-align: left;
        min-width: auto;
        width: 100%;
    }
    
    .hero__goal-icon {
        width: 80px;
        height: 60px;
        flex-shrink: 0;
    }
    
    .hero__goal-icon-text {
        font-size: 12px;
    }
    
    .hero__goal-content {
        margin-left: 15px;
    }
    
    .hero__goal-title {
        font-size: 18px;
        margin-bottom: 5px;
    }
    
    .hero__goal-desc {
        font-size: 13px;
    }
    
    .about {
        padding: 60px 0;
    }
    
    .about__container {
        padding: 0 15px;
    }
    
    .about__title {
        font-size: 36px;
        margin-bottom: 25px;
    }
    
    .about__description {
        font-size: 14px;
        margin-bottom: 40px;
    }
    
    .about__description strong {
        font-size: 20px;
        margin-bottom: 15px;
    }
    
    .about__btn {
        width: 100%;
        max-width: 200px;
    }
    
    .about__gallery {
        gap: 15px;
    }
    
    .about__gallery-row {
        gap: 15px;
    }
    
    .business__container {
        padding: 50px 15px;
    }
    
    .business__header {
        padding: 40px 15px;
        margin-bottom: 30px;
    }
    
    .business__title {
        font-size: 36px;
        margin-bottom: 20px;
    }
    
    .business__description {
        font-size: 14px;
    }
    
    .business__link {
        padding: 30px 15px;
    }
    
    .business__category {
        justify-content: center;
        margin-bottom: 25px;
    }
    
    .business__icon-plus {
        display: none;
    }
    
    .business__content {
        text-align: center;
    }
    
    .business__item-title {
        font-size: 24px;
    }
    
    .business__item-title span {
        font-size: 14px;
    }
    
    .esg {
        padding: 60px 0;
    }
    
    .esg__container {
        padding: 0 15px;
    }
    
    .esg__title {
        font-size: 36px;
        margin-bottom: 15px;
    }
    
    .esg__description {
        font-size: 14px;
    }
    
    .esg__card-text {
        font-size: 28px;
    }
    
    .esg__card-title {
        font-size: 24px;
    }
    
    .esg__card-description {
        font-size: 14px;
    }
    
    .footer {
        padding: 40px 0 30px;
    }
    
    .footer__container {
        padding: 0 15px;
    }
    
    .footer__info-row {
        flex-direction: column;
        gap: 20px;
    }
    
    .side-nav {
        display: none;
    }
}

@media screen and (max-width: 480px) {
    .hero {
        height: 550px;
    }
    
    .hero__content {
        top: 8%;
        padding: 0 10px;
    }
    
    .hero__title {
        width: auto;
        max-width: 200px;
        height: auto;
        font-size: 48px;
        margin-bottom: 15px;
    }
    
    .hero__description {
        font-size: 14px;
        line-height: 1.5;
    }
    
    .hero__pagination {
        gap: 15px;
        margin-top: 40px;
    }
    
    .hero__goals-container {
        padding: 20px 10px;
    }
    
    .hero__goal {
        flex-direction: column;
        text-align: center;
    }
    
    .hero__goal-icon {
        width: 70px;
        height: 50px;
        margin: 0 auto;
    }
    
    .hero__goal-content {
        margin-left: 0;
        margin-top: 10px;
    }
    
    .hero__goal-title {
        font-size: 16px;
    }
    
    .hero__goal-desc {
        font-size: 12px;
    }
    
    .about {
        padding: 50px 0;
    }
    
    .about__container {
        padding: 0 10px;
    }
    
    .about__title {
        font-size: 28px;
    }
    
    .about__description {
        font-size: 13px;
    }
    
    .about__description strong {
        font-size: 18px;
    }
    
    .business__container {
        padding: 40px 10px;
    }
    
    .business__header {
        padding: 30px 10px;
    }
    
    .business__title {
        font-size: 28px;
    }
    
    .business__description {
        font-size: 13px;
    }
    
    .business__link {
        padding: 25px 10px;
    }
    
    .business__item-title {
        font-size: 20px;
    }
    
    .business__item-title span {
        font-size: 12px;
    }
    
    .esg {
        padding: 50px 0;
    }
    
    .esg__container {
        padding: 0 10px;
    }
    
    .esg__title {
        font-size: 28px;
    }
    
    .esg__card-text {
        font-size: 24px;
    }
    
    .esg__card-title {
        font-size: 20px;
    }
    
    .esg__card-description {
        font-size: 13px;
    }
}