:root {
            --primary: #e60012;
            --black: #1e293b;
            --bg-gray: #f8fafc;
            --text-sub: #393f47;
            --border: #e2e8f0;
            --radius: 12px;
            --shadow: 0 15px 40px rgba(0, 0, 0, 0.05);
            --transition: all 0.3s ease;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Pretendard', sans-serif; color: var(--black); background: #fff; line-height: 1.6; overflow-x: hidden; }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }
        section { padding: 0; }


        .sub-hero { padding: 180px 40px 100px; background: url('/britestone/img/building.png') center / cover; position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; color: #fff; }
        .sub-hero::before { content: ''; position: absolute; inset: 0; background: rgba(15, 23, 42, 0.4); }
        .sub-hero-content { position: relative; z-index: 2; }
        .sub-hero h1 {  font-size: 3.3em; font-weight: 700; margin-bottom: 5px; letter-spacing: -1px; }
        .sub-hero p { font-size: 1.2rem; font-weight: 400; opacity: 0.8; }

   
        .sub-layout { display: flex; gap: 70px; max-width: 1360px; margin: 0 auto; padding: 80px 40px; }


        .lnb-wrap { 
            flex: 0 0 240px; 
            position: sticky; 
            top: 140px; 
            align-self: flex-start; 
        }
        .lnb-title { 
            font-size: 1.8rem; 
            font-weight: 800; 
            color: var(--black); 
            margin-bottom: 20px; 
        }
        .lnb-list { border-top: 2px solid var(--black); }
        .lnb-list li { border-bottom: 1px solid var(--border); }
        .lnb-list li a { 
            display: flex; 
            justify-content: space-between; 
            align-items: center; 
            padding: 18px 10px; 
            font-size: 1.15rem; 
            color: var(--text-sub); 
            transition: var(--transition); 
        }
        .lnb-list li a:hover, 
        .lnb-list li.active a { 
            color: var(--black); 
            font-weight: 700; 
        }
        .lnb-list li a .lnb-icon { 
            width: 14px; 
            opacity: 0; 
            transition: var(--transition); 
        }
        .lnb-list li a:hover .lnb-icon, 
        .lnb-list li.active a .lnb-icon { opacity: 1; }


        .content-wrap { flex: 1; min-width: 0; }
        .content-body { padding: 0; }

        .sub-section {
            display: block; 
            margin-bottom: 100px;
        }
        .sub-section:first-child { margin-top: 0; }


        .sec-top {
            margin-bottom: 20px;
        }


        .section-tit {
            display: flex;
            align-items: center;
            justify-content: flex-start;
            gap: 7px;
            font-size: 1.8rem; 
            font-weight: 800;
            color: var(--black);
            margin: 0;
            letter-spacing: -0.5px;
        }
        .section-tit .tit-icon {
            width: 16px; 
            height: auto;
        }


        .sec-bottom.content-panel {
            width: 100%;
            max-width: 1000px;
            background: #f9f9f9;
            padding: 40px; 
        }

        /* ==========================================
           1. 인사말 
        ========================================== */
        .greeting-content p {
            font-size: 1.15rem;
            line-height: 1.8;
            font-weight: 300;
            margin-bottom: 15px;
            word-break: keep-all;
            color: var(--text-sub);
        }
        .greeting-content p.highlight-text {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--black);
            line-height: 1.5;
            margin-bottom: 30px;
        }
        .greeting-content p strong { color: var(--black); font-weight: 600; }
        .greeting-content p:last-child { margin-bottom: 0; }

        .greeting-sign {
            margin-top: 60px;
            padding-top: 30px;
            border-top: 1px dashed #cbd5e1; 
            text-align: right;
        }
        .greeting-sign p { font-size: 1.15rem; margin-bottom: 5px; color: var(--black); }
        .greeting-sign .sign-name { font-size: 1.25rem; color: var(--text-sub); }
        .greeting-sign .sign-name strong { font-weight: 800; font-size: 1.6rem; color: var(--black); margin-left: 10px; }

        /* ==========================================
           2. 브랜드 스토리 
        ========================================== */
        .story-img {
            width: 100%;
            border-radius: 10px;
            overflow: hidden;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }
        .story-img img {
            width: 100%;
            height: 300px;
            display: block;
            object-fit: cover;
            object-position: bottom;
        }
        .story-text-box h4 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--black);
            margin-bottom: 20px;
            line-height: 1.5;
        }
        .story-text-box p {
            font-size: 1.1rem;
            line-height: 1.8;
            font-weight: 300;
            color: var(--text-sub);
            word-break: keep-all;
        }

        /* ==========================================
           3. CI
        ========================================== */
        .ci-desc {
            margin-bottom: 16px;
            font-size: 1.1rem;
            line-height: 1.8;
            font-weight: 300;
            color: var(--text-sub);
            word-break: keep-all;
        }

        .ci-logos {
            display: flex;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            margin-bottom: 50px;
            margin-top: 40px;
        }
        .logo-type {
            flex: 1;
            position: relative;
            padding: 80px 40px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .logo-type.type1 { background: #ffffff; }
        .logo-type.type2 { background: #262222; }
        .type-label {
            position: absolute;
            top: 20px;
            left: 20px;
            font-size: 1.05rem;
            font-weight: 500;
        }
        .logo-type.type1 .type-label { color: #cbd5e1; }
        .logo-type.type2 .type-label { color: #64748b; }
        .logo-type img {
            max-width: 250px;
            width: 100%;
            height: auto;
        }

        
        .ci-color-system {
            display: flex;
            justify-content: space-between;
            gap: 30px;
            margin-bottom: 60px;
        }
        .color-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            flex: 1;
        }
        .color-item .color-box {
            width: 80px;
            height: 80px;
            flex-shrink: 0;
            border-radius: 8px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }
        .color-item .color-box.has-border { border: 1px solid #e2e8f0; }
        .color-desc {
            display: flex;
            gap: 35px;
            font-size: 0.95rem;
            color: var(--black);
            line-height: 1.7;
            font-variant-numeric: tabular-nums;
            letter-spacing: 0.5px;
        }
        .color-desc .val-col {
            display: flex;
            flex-direction: column;
            min-width: 80px;
        }
        .color-desc .val-col span { color: var(--text-sub); }
        .color-desc .val-col span:last-child {
            margin-top: 5px;
            font-weight: 700;
            color: var(--black);
        }

     
        .ci-download {
            display: flex;
            gap: 12px;
            margin-top: 20px;
        }
        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            padding: 13px 24px;
            background: #fff; 
            border: 1px solid #cbd5e1;
            border-radius: 4px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--black);
            transition: all 0.3s ease;
        }
        .btn-download i {
            font-size: 0.85rem;
            transition: transform 0.3s ease;
        }
        .btn-download:hover {
            border-color: var(--black);
            background: var(--black);
            color: #fff;
        }
        .btn-download:hover i {
            transform: translateY(3px); 
        }

        /* 반응형 처리 (태블릿/모바일) */
        @media (max-width: 1024px) {
            .sub-layout { flex-direction: column; gap: 40px; }
            .lnb-wrap { flex: auto; position: static; width: 100%; }
            .sec-bottom.content-panel { padding: 40px 30px; }
            .ci-logos { flex-direction: column; }
            .ci-color-system { flex-direction: column; gap: 30px; }
            .ci-download { flex-direction: column; }
            .btn-download { justify-content: center; }
        }