/* ==============================================================================
   메가원에너지 (MEGA ONE ENERGY) 공식 웹사이트 디자인 시스템 & 스타일시트
   ------------------------------------------------------------------------------
   - 다크 럭셔리 모드 (스튜디오 다크 네이비 & 임페리얼 골드 & 플래티넘 실버)
   - 글래스모피즘(Glassmorphism) 카드 컴포넌트
   - 모바일/태블릿/데스크톱 완벽 반응형 레이아웃
   - 부드러운 스크롤 애니메이션 및 호버 인터랙션
   ============================================================================== */

/* ------------------------------------------------------------------------------
   1. 디자인 토큰 & CSS 변수 정의
   ------------------------------------------------------------------------------ */
:root {
    /* 배경 컬러 팔레트 */
    --bg-primary: #07090e;
    --bg-secondary: #0d111a;
    --bg-card: rgba(18, 24, 38, 0.7);
    --bg-card-hover: rgba(26, 34, 52, 0.85);

    /* 럭셔리 골드 컬러 토큰 (M1 심볼의 골드와 100% 매칭) */
    --gold-primary: #e5b95f;
    --gold-light: #f5d48c;
    --gold-dark: #b88a32;
    --gold-glow: rgba(229, 185, 95, 0.25);
    --gold-gradient: linear-gradient(135deg, #fce09b 0%, #e5b95f 50%, #b88a32 100%);

    /* 플래티넘 실버 컬러 토큰 */
    --silver-primary: #e2e5eb;
    --silver-light: #ffffff;
    --silver-dark: #9aa2b0;
    --silver-gradient: linear-gradient(135deg, #ffffff 0%, #d8dde6 100%);

    /* 텍스트 컬러 */
    --text-primary: #f0f3f8;
    --text-secondary: #9ea8b6;
    --text-muted: #647082;

    /* 보더 및 라인 */
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-gold: rgba(229, 185, 95, 0.35);

    /* 타이포그래피 */
    --font-sans: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    --font-en: "Outfit", sans-serif;

    /* 전환 효과 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
}

/* ------------------------------------------------------------------------------
   2. 전역 리셋 & 기본 설정
   ------------------------------------------------------------------------------ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 50% 0%, rgba(229, 185, 95, 0.06) 0%, transparent 45%),
        radial-gradient(circle at 90% 20%, rgba(26, 45, 80, 0.2) 0%, transparent 40%);
}

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

ul {
    list-style: none;
}

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

/* 유틸리티 컨테이너 */
.section-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 텍스트 그라데이션 유틸리티 */
.text-gold {
    color: var(--gold-primary);
}

.text-gradient-gold {
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ------------------------------------------------------------------------------
   3. 헤더 & GNB 스타일
   ------------------------------------------------------------------------------ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 84px;
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    height: 72px;
    background: rgba(7, 9, 14, 0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

/* 로고 & 브랜드 아이덴티티 (심볼 + 메가원에너지 텍스트 결합형) */
.brand-identity {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    cursor: pointer;
    user-select: none;
}

/* 원형 투명 심볼 아이콘: 컴팩트한 크기로 헤더 여백 최적화 */
.brand-symbol-icon {
    width: 42px;
    height: 42px;
    object-fit: contain;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.4));
    transition: transform 0.3s ease;
}

.brand-identity:hover .brand-symbol-icon {
    transform: rotate(6deg) scale(1.05);
}

.site-header.scrolled .brand-symbol-icon {
    width: 38px;
    height: 38px;
}

/* 브랜드 텍스트 블록 (웹 폰트 렌더링으로 번짐 없이 선명함) */
.brand-text-block {
    display: flex;
    flex-direction: column;
    justify-content: center;
    line-height: 1.15;
}

.brand-korean {
    font-size: 21px;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.6px;
    display: flex;
    align-items: center;
}

.brand-korean .gold-text {
    color: var(--gold-primary);
    font-weight: 800;
    margin: 0 1px;
    text-shadow: 0 0 12px rgba(229, 185, 95, 0.4);
}

.brand-english {
    font-family: var(--font-en);
    font-size: 9.5px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 2px;
    margin-top: 2px;
    text-transform: uppercase;
}

/* 메뉴 리스트 */
.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 15.5px;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

.nav-link:hover {
    color: #ffffff;
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gold-gradient);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* 우측 액션 CTA */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-cta-gold {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--gold-gradient);
    color: #0b0c10;
    font-weight: 700;
    font-size: 14.5px;
    border-radius: 30px;
    box-shadow: 0 4px 15px var(--gold-glow);
}

.btn-cta-gold:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(229, 185, 95, 0.45);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: #fff;
    transition: var(--transition);
}

.mobile-menu-drawer {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(10, 13, 20, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.mobile-menu-drawer.open {
    display: block;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.mobile-nav-link {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
}

/* ------------------------------------------------------------------------------
   4. 히어로 섹션
   ------------------------------------------------------------------------------ */
/* ==============================================================================
   3. 히어로 섹션 (Hero Section) - 웅장한 태양광 실사 배경 & 임팩트 2~3줄
   ============================================================================== */
.hero-section {
    position: relative;
    padding-top: 180px;
    padding-bottom: 110px;
    min-height: 88vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    /* 맑고 푸른 태양광 실사 이미지를 시원하게 살리는 시네마틱 앰비언트 그라데이션 */
    background: 
        linear-gradient(180deg, rgba(7, 10, 18, 0.42) 0%, rgba(7, 10, 18, 0.58) 50%, rgba(7, 10, 18, 0.95) 100%),
        radial-gradient(circle at 50% 35%, rgba(229, 185, 95, 0.15) 0%, transparent 60%),
        url('../assets/hero_solar_farm.jpg') center 40% / cover no-repeat;
    background-attachment: scroll;
}

.hero-bg-glow {
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: 650px;
    height: 420px;
    background: radial-gradient(circle, rgba(229, 185, 95, 0.14) 0%, transparent 70%);
    filter: blur(80px);
    pointer-events: none;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 980px;
    margin: 0 auto;
    text-align: center;
}

/* 상단 카테고리 뱃지 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(10, 14, 24, 0.65);
    border: 1px solid rgba(229, 185, 95, 0.35);
    padding: 7px 18px;
    border-radius: 9999px;
    margin-bottom: 24px;
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.badge-dot {
    width: 7px;
    height: 7px;
    background: var(--gold-light);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--gold-light);
    animation: pulseGlow 2s infinite ease-in-out;
}

@keyframes pulseGlow {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.3); }
}

.badge-text {
    font-family: var(--font-en);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--gold-light);
}

/* 1줄: 강력한 임팩트 메인 타이틀 */
.hero-title {
    font-size: clamp(38px, 5.2vw, 62px);
    font-weight: 800;
    line-height: 1.22;
    letter-spacing: -1.2px;
    color: #FFFFFF;
    margin-bottom: 22px;
    text-shadow: 0 4px 24px rgba(0, 0, 0, 0.85), 0 2px 8px rgba(0, 0, 0, 0.6);
}

.text-gradient-gold {
    background: linear-gradient(135deg, #FFFFFF 0%, #F5D389 40%, #E5B95F 80%, #C99635 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* 2줄: 핵심 수익 및 이득 서브카피 */
.hero-subtitle {
    font-size: clamp(16px, 1.8vw, 19.5px);
    line-height: 1.68;
    color: #E2E8F0;
    margin: 0 auto 30px;
    max-width: 820px;
    font-weight: 450;
    word-break: keep-all;
    text-shadow: 0 3px 16px rgba(0, 0, 0, 0.9), 0 1px 4px rgba(0, 0, 0, 0.7);
}

/* 3줄: 4대 핵심 혜택 미니 글래스 칩 바 */
.hero-benefits-chips {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 38px;
}

.benefit-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 9999px;
    font-size: 14px;
    font-weight: 700;
    backdrop-filter: blur(14px);
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
    transition: all 0.25s ease;
    letter-spacing: -0.2px;
}

.benefit-chip:hover {
    transform: translateY(-2px);
}

.chip-gold {
    background: rgba(229, 185, 95, 0.16);
    border: 1px solid rgba(229, 185, 95, 0.45);
    color: #FCE7AC;
}

.chip-accent {
    background: rgba(245, 158, 11, 0.18);
    border: 1px solid rgba(245, 158, 11, 0.5);
    color: #FDE68A;
}

.chip-green {
    background: rgba(16, 185, 129, 0.16);
    border: 1px solid rgba(16, 185, 129, 0.45);
    color: #A7F3D0;
}

.chip-blue {
    background: rgba(59, 130, 246, 0.16);
    border: 1px solid rgba(59, 130, 246, 0.45);
    color: #BFDBFE;
}

/* CTA 버튼 그룹 */
.hero-cta-group {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary-large {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #E5B95F 0%, #C99635 100%);
    color: #0B0E14;
    font-size: 16px;
    font-weight: 800;
    padding: 16px 34px;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(229, 185, 95, 0.35);
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(229, 185, 95, 0.5);
    background: linear-gradient(135deg, #F0C774 0%, #D4A343 100%);
}

.btn-secondary-large {
    display: inline-flex;
    align-items: center;
    background: rgba(15, 20, 32, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #FFFFFF;
    font-size: 16px;
    font-weight: 600;
    padding: 16px 30px;
    border-radius: var(--radius-md);
    backdrop-filter: blur(12px);
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-secondary-large:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(229, 185, 95, 0.5);
    color: var(--gold-light);
    transform: translateY(-3px);
}

/* ------------------------------------------------------------------------------
   5. 회사 소개 섹션 (About Us)
   ------------------------------------------------------------------------------ */
.about-section {
    padding: 120px 0;
    background: var(--bg-secondary);
    position: relative;
}

.section-header {
    margin-bottom: 60px;
}

.section-header.text-center {
    text-align: center;
}

.section-eyebrow {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 13px;
    font-weight: 700;
    color: var(--gold-primary);
    letter-spacing: 2px;
    margin-bottom: 12px;
    text-transform: uppercase;
}

.section-title {
    font-size: 38px;
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: -0.8px;
    margin-bottom: 18px;
}

.section-desc {
    font-size: 16.5px;
    color: var(--text-secondary);
    max-width: 680px;
    line-height: 1.7;
}

.section-header.text-center .section-desc {
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: center;
}

/* 엠블럼 쇼케이스 카드 */
.about-symbol-card {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    position: relative;
    overflow: hidden;
}

.about-symbol-card::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(229, 185, 95, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.symbol-display {
    width: 220px;
    height: 220px;
    margin: 0 auto 24px auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-emblem-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.8));
    animation: gentle-float 4s ease-in-out infinite;
}

@keyframes gentle-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.symbol-info h3 {
    font-size: 20px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 10px;
}

.symbol-info p {
    font-size: 14.5px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 3대 특징 리스트 */
.about-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-gold);
    transform: translateX(6px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(229, 185, 95, 0.12);
    border: 1px solid var(--border-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gold-primary);
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
    color: #fff;
}

.feature-text p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ------------------------------------------------------------------------------
   6. 사업 영역 (Business Solutions)
   ------------------------------------------------------------------------------ */
.solutions-section {
    padding: 120px 0;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.solution-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 0 0 32px 0;
    transition: var(--transition);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* 솔루션 카드 태양광 실사 썸네일 이미지 */
.card-thumb-wrap {
    width: 100%;
    height: 190px;
    overflow: hidden;
    position: relative;
    border-bottom: 1px solid var(--border-subtle);
}

.card-thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.solution-card:hover .card-thumb-img {
    transform: scale(1.08);
}

.card-thumb-wrap::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(13, 18, 28, 0.8) 100%);
    pointer-events: none;
}

.card-body-content {
    padding: 24px 28px 0 28px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.solution-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-gold);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.card-glow {
    position: absolute;
    top: 0;
    right: 0;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, var(--gold-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.solution-card:hover .card-glow {
    opacity: 1;
}

.card-number {
    font-family: var(--font-en);
    font-size: 32px;
    font-weight: 800;
    color: rgba(229, 185, 95, 0.35);
    margin-bottom: 16px;
}

.card-title {
    font-size: 21px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 4px;
}

.card-subtitle {
    font-family: var(--font-en);
    font-size: 12.5px;
    font-weight: 600;
    color: var(--gold-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.card-desc {
    font-size: 14.5px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.card-spec-list {
    border-top: 1px solid var(--border-subtle);
    padding-top: 16px;
}

.card-spec-list li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 8px;
    font-size: 13.5px;
    color: #c0c6d0;
}

/* 솔루션 썸네일 위 골드 뱃지 */
.solution-badge-gold {
    position: absolute;
    top: 14px;
    right: 14px;
    background: rgba(11, 15, 23, 0.85);
    border: 1px solid var(--border-gold);
    color: var(--gold-light);
    font-size: 12px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 20px;
    backdrop-filter: blur(8px);
    z-index: 2;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.highlight-badge {
    background: var(--gold-gradient);
    color: #0b0d13;
    border: none;
    font-weight: 800;
    box-shadow: 0 4px 15px var(--gold-glow);
}

/* 솔루션 금융 및 지원 투트랙 박스 */
.solution-finance-box {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(8, 11, 18, 0.65);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
}

.finance-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-bottom: 10px;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}

.finance-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.finance-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
}

.finance-tag {
    font-size: 11.5px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
}

.tag-energy {
    background: rgba(46, 144, 250, 0.15);
    color: #52a9ff;
    border: 1px solid rgba(82, 169, 255, 0.3);
}

.tag-bank {
    background: rgba(152, 162, 179, 0.15);
    color: #d0d5dd;
    border: 1px solid rgba(208, 213, 221, 0.3);
}

.tag-eco {
    background: rgba(22, 179, 100, 0.15);
    color: #32d583;
    border: 1px solid rgba(50, 213, 131, 0.3);
}

.tag-gold {
    background: var(--gold-glow);
    color: var(--gold-light);
    border: 1px solid var(--border-gold);
}

.tag-safe {
    background: rgba(238, 148, 36, 0.15);
    color: #f79009;
    border: 1px solid rgba(247, 144, 9, 0.3);
}

.finance-rate {
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
}

.finance-desc {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 5년치 선납 하이라이트 카드 스타일 */
.highlight-card {
    border-color: rgba(229, 185, 95, 0.55);
    background: linear-gradient(180deg, rgba(20, 27, 42, 0.8) 0%, rgba(13, 17, 26, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(229, 185, 95, 0.15);
}

.highlight-item {
    background: rgba(229, 185, 95, 0.08);
    padding: 10px;
    border-radius: 6px;
    border: 1px solid rgba(229, 185, 95, 0.2);
}

.card-spec-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--gold-primary);
    font-size: 16px;
}

/* ------------------------------------------------------------------------------
   7. 자주 묻는 질문 Q&A 섹션 (FAQ & Accordion)
   ------------------------------------------------------------------------------ */
.qna-section {
    padding: 120px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

/* 카테고리 탭 버튼 */
.qna-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.qna-tab-btn {
    padding: 10px 22px;
    border-radius: 30px;
    border: 1px solid var(--border-subtle);
    background: rgba(14, 18, 28, 0.7);
    color: var(--text-secondary);
    font-size: 14.5px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(8px);
}

.qna-tab-btn:hover {
    border-color: var(--gold-primary);
    color: #fff;
    transform: translateY(-2px);
}

.qna-tab-btn.active {
    background: var(--gold-gradient);
    color: #0b0d13;
    border-color: transparent;
    font-weight: 700;
    box-shadow: 0 4px 16px var(--gold-glow);
}

/* 아코디언 리스트 컨테이너 - 데스크톱 2열 그리드(2-Column Layout) */
.qna-accordion-list {
    max-width: 1240px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    align-items: start;
}

/* 3~4줄 핵심 요약 리스트 스타일 */
.qna-summary-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.qna-summary-list li {
    position: relative;
    padding-left: 20px;
    font-size: 14.5px;
    line-height: 1.65;
    color: #cbd5e1;
}

.qna-summary-list li::before {
    content: "•";
    position: absolute;
    left: 4px;
    top: 0;
    color: var(--gold-primary);
    font-size: 18px;
    font-weight: 700;
}

.qna-summary-list li strong {
    color: #ffffff;
    font-weight: 600;
}

.qna-item {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.qna-item:hover {
    border-color: rgba(229, 185, 95, 0.4);
}

.qna-item.active {
    border-color: var(--border-gold);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    background: rgba(20, 26, 42, 0.85);
}

/* 질문 버튼 헤더 */
.qna-question {
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    padding: 22px 26px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    font-family: inherit;
    color: #ffffff;
    transition: var(--transition);
}

.qna-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    white-space: nowrap;
    flex-shrink: 0;
}

.badge-profit {
    background: rgba(229, 185, 95, 0.15);
    color: var(--gold-light);
    border: 1px solid rgba(229, 185, 95, 0.3);
}

.badge-permit {
    background: rgba(46, 144, 250, 0.15);
    color: #52a9ff;
    border: 1px solid rgba(82, 169, 255, 0.3);
}

.badge-finance {
    background: rgba(22, 179, 100, 0.15);
    color: #32d583;
    border: 1px solid rgba(50, 213, 131, 0.3);
}

.badge-quality {
    background: rgba(238, 148, 36, 0.15);
    color: #f79009;
    border: 1px solid rgba(247, 144, 9, 0.3);
}

.qna-title {
    font-size: 16.5px;
    font-weight: 700;
    flex: 1;
    line-height: 1.5;
    color: #ffffff;
}

.qna-arrow {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    transition: transform 0.3s ease, background 0.3s ease;
}

.qna-arrow::before {
    content: "";
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--gold-primary);
    border-bottom: 2px solid var(--gold-primary);
    transform: rotate(45deg);
    transition: transform 0.3s ease;
    margin-top: -3px;
}

.qna-item.active .qna-arrow {
    background: var(--gold-gradient);
    transform: rotate(180deg);
}

.qna-item.active .qna-arrow::before {
    border-color: #0b0d13;
    margin-top: 3px;
}

/* 답변 내용 영역 */
.qna-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0, 1, 0, 1);
}

.qna-item.active .qna-answer {
    max-height: 1200px;
    transition: max-height 0.5s ease-in-out;
}

.qna-answer-inner {
    padding: 0 26px 26px 26px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 20px;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Q&A 답변 내부 하이라이트 그리드 */
.qna-highlight-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
}

@media (max-width: 768px) {
    .qna-highlight-grid {
        grid-template-columns: 1fr;
    }
}

.qna-box {
    background: rgba(10, 13, 20, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    padding: 18px 20px;
}

.qna-box h5 {
    font-size: 15px;
    font-weight: 700;
    color: var(--gold-light);
    margin-bottom: 8px;
}

.qna-box p {
    font-size: 13.5px;
    color: #bac3cf;
    line-height: 1.6;
    margin: 0;
}

/* 100kW 계산 카드 */
.qna-calc-card {
    background: rgba(10, 14, 24, 0.85);
    border: 1px solid var(--border-gold);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin: 16px 0 12px 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.calc-row {
    display: flex;
    justify-content: space-between;
    font-size: 14.5px;
    color: #d8dde6;
    flex-wrap: wrap;
    gap: 6px;
}

.calc-total {
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px dashed rgba(229, 185, 95, 0.4);
    display: flex;
    justify-content: space-between;
    font-size: 16px;
    font-weight: 700;
    color: #ffffff;
    flex-wrap: wrap;
    gap: 6px;
}

.total-val {
    color: var(--gold-light);
    font-size: 17px;
}

.calc-note {
    font-size: 13px;
    color: var(--text-muted);
}

/* 절세 혜택 강조 박스 */
.qna-highlight-box {
    background: rgba(15, 20, 32, 0.75);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 14px;
}

.qna-highlight-box.gold-border {
    border-left: 4px solid var(--gold-primary);
}

.qna-highlight-box h4 {
    font-size: 16px;
    color: var(--gold-light);
    margin-bottom: 8px;
}

.tax-example {
    background: rgba(0, 0, 0, 0.3);
    padding: 12px 16px;
    border-radius: 6px;
    margin-top: 10px;
    font-size: 13.5px;
    color: #bac3cf;
}

/* Q&A 리스트 불릿 */
.qna-bullet-list {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.qna-bullet-list li {
    position: relative;
    padding-left: 20px;
    font-size: 14.5px;
    color: #c5cdd8;
    line-height: 1.6;
}

.qna-bullet-list li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: var(--gold-primary);
    font-size: 16px;
}

/* ------------------------------------------------------------------------------
   8. 프로세스 섹션 (Process)
   ------------------------------------------------------------------------------ */
.process-section {
    padding: 120px 0;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
    position: relative;
    margin-top: 40px;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0;
    transition: var(--transition);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.step-card:hover {
    border-color: var(--border-gold);
    transform: translateY(-8px);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
}

/* 스텝 카드 이미지 썸네일 */
.step-thumb-wrap {
    width: 100%;
    height: 140px;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-subtle);
}

.step-thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.step-card:hover .step-thumb-img {
    transform: scale(1.1);
}

.step-thumb-wrap::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(10, 14, 22, 0.85) 100%);
    pointer-events: none;
}

.step-badge {
    position: absolute;
    bottom: 10px;
    left: 12px;
    font-family: var(--font-en);
    font-size: 11.5px;
    font-weight: 800;
    color: #0b0d13;
    background: var(--gold-gradient);
    padding: 3px 10px;
    border-radius: 12px;
    z-index: 2;
    box-shadow: 0 2px 8px var(--gold-glow);
}

.step-content {
    padding: 18px 16px 22px 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.step-content h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    line-height: 1.4;
}

.step-content p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.55;
}

.step-connector {
    display: none;
}

/* ------------------------------------------------------------------------------
   9. 온라인 견적 문의 섹션 (Contact)
   ------------------------------------------------------------------------------ */
.contact-section {
    padding: 120px 0;
    background: radial-gradient(circle at 80% 50%, rgba(229, 185, 95, 0.08) 0%, transparent 50%),
                var(--bg-secondary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.25fr;
    gap: 50px;
    align-items: start;
}

.contact-title {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.35;
    margin-bottom: 18px;
}

.contact-desc {
    font-size: 15.5px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 36px;
}

.contact-meta-box {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    padding: 16px 20px;
    border-radius: var(--radius-md);
}

.meta-icon {
    font-size: 24px;
}

.meta-title {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
}

.meta-val {
    font-size: 16px;
    color: #ffffff;
}

/* 연락처/이메일 클릭 가능한 링크 스타일 */
.contact-link {
    color: #ffffff;
    transition: var(--transition);
    display: inline-block;
}

.contact-link:hover {
    color: var(--gold-light);
    text-decoration: underline;
    text-underline-offset: 4px;
}

/* 견적 문의 폼 카드 */
.contact-form-card {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(16px);
}

.form-title {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 6px;
}

.form-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: #e0e5ed;
    margin-bottom: 8px;
}

.required {
    color: var(--gold-primary);
}

input[type="text"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 13px 16px;
    background: rgba(9, 12, 18, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-sm);
    color: #ffffff;
    font-family: inherit;
    font-size: 14.5px;
    transition: var(--transition);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--gold-primary);
    box-shadow: 0 0 12px var(--gold-glow);
    background: rgba(9, 12, 18, 0.95);
}

.form-privacy {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 26px;
}

.form-privacy input {
    accent-color: var(--gold-primary);
    width: 16px;
    height: 16px;
}

.form-privacy label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 0;
    cursor: pointer;
}

.btn-submit-gold {
    width: 100%;
    padding: 16px;
    background: var(--gold-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: #0b0c10;
    font-size: 16.5px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: 0 8px 20px var(--gold-glow);
    transition: var(--transition);
}

.btn-submit-gold:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(229, 185, 95, 0.45);
}

/* ------------------------------------------------------------------------------
   10. 푸터 (Footer)
   ------------------------------------------------------------------------------ */
.site-footer {
    background: #040508;
    border-top: 1px solid var(--border-subtle);
    padding: 70px 0 35px 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.15fr 1.35fr 1fr;
    gap: 48px;
    padding-bottom: 50px;
    border-bottom: 1px solid var(--border-subtle);
    align-items: start;
}

.footer-brand {
    max-width: 360px;
}

.footer-brand .brand-identity {
    margin-bottom: 20px;
}

.footer-slogan {
    font-size: 14.5px;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* 푸터 중앙 공식 회사 정보 블록 스타일 (Center Column) */
.footer-center-corp {
    max-width: 440px;
}

.footer-center-corp .footer-corp-info {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.corp-info-item {
    font-size: 13.5px;
    color: var(--text-secondary);
    line-height: 1.55;
}

.corp-info-item .info-label {
    color: var(--gold-primary);
    font-weight: 600;
    margin-right: 6px;
}

.corp-info-item a {
    color: #e0e5ed;
    transition: var(--transition);
}

.corp-info-item a:hover {
    color: var(--gold-light);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.group-title {
    display: block;
    font-size: 15px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
}

.link-group ul li {
    margin-bottom: 10px;
}

.link-group ul li a {
    font-size: 14px;
    color: var(--text-secondary);
}

.link-group ul li a:hover {
    color: var(--gold-primary);
}

.footer-bottom {
    padding-top: 35px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
    flex-wrap: wrap;
    gap: 16px;
}

.company-meta span.sep {
    margin: 0 8px;
    opacity: 0.4;
}

/* ------------------------------------------------------------------------------
   11. 반응형 미디어 쿼리 (Responsive Media Queries)
   ------------------------------------------------------------------------------ */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .process-steps {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 16px;
    }
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .footer-top {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    .qna-accordion-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .site-header {
        height: 72px;
    }
    .main-nav, .btn-cta-gold {
        display: none;
    }
    .mobile-toggle {
        display: flex;
    }
    .hero-section {
        padding-top: 140px;
    }
    .hero-title {
        font-size: 32px;
    }
    .hero-subtitle {
        font-size: 16px;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .footer-links {
        gap: 30px;
    }
    .mobile-hide {
        display: none;
    }
}


/* 히어로 4대 이득 반응형 그리드 */
@media (max-width: 1024px) {
    .hero-benefits-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

@media (max-width: 640px) {
    .hero-benefits-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .benefits-header-badge .badge-txt {
        font-size: 12px;
    }
}


/* ==============================================================================
   7. 무료 견적/수익 분석 신청 완료 모달 안내창
   ============================================================================== */
.custom-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: 20px;
}

.custom-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(4, 7, 14, 0.85);
    backdrop-filter: blur(8px);
}

.modal-card {
    position: relative;
    background: rgba(15, 20, 32, 0.95);
    border: 1px solid rgba(229, 185, 95, 0.45);
    border-radius: 24px;
    padding: 40px 32px;
    max-width: 440px;
    width: 100%;
    text-align: center;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.8), 0 0 35px rgba(229, 185, 95, 0.2);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 2;
}

.custom-modal.active .modal-card {
    transform: scale(1) translateY(0);
}

.modal-icon-circle {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: rgba(229, 185, 95, 0.12);
    border: 1px solid rgba(229, 185, 95, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 25px rgba(229, 185, 95, 0.25);
    animation: modalPulse 2s infinite ease-in-out;
}

@keyframes modalPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(229, 185, 95, 0.2); }
    50% { box-shadow: 0 0 35px rgba(229, 185, 95, 0.45); }
}

.modal-title {
    font-size: 22px;
    font-weight: 800;
    color: #FFFFFF;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
}

.modal-message {
    font-size: 16px;
    line-height: 1.65;
    color: #E2E8F0;
    margin-bottom: 28px;
    word-break: keep-all;
}

.btn-modal-confirm {
    display: inline-block;
    width: 100%;
    background: linear-gradient(135deg, #E5B95F 0%, #C99635 100%);
    color: #0B0E14;
    font-size: 16px;
    font-weight: 800;
    padding: 14px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(229, 185, 95, 0.35);
    transition: all 0.25s ease;
}

.btn-modal-confirm:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(229, 185, 95, 0.5);
    background: linear-gradient(135deg, #F0C774 0%, #D4A343 100%);
}


/* 전송 로딩 스피너 애니메이션 */
.spin-animation {
    animation: rotateSpin 1s linear infinite;
}

@keyframes rotateSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}