:root {
    --background: #f5f7fa;
    --surface: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --dark: #08111f;
    --dark-soft: #0f1b2d;
    --max-width: 1280px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Segoe UI", "Pretendard", Arial, sans-serif;
    color: var(--text);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(calc(100% - 48px), var(--max-width));
    margin: 0 auto;
}

/* Header */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 76px;
    background: rgba(8,17,31,.92);
    border-bottom: 1px solid rgba(255,255,255,.08);
    backdrop-filter: blur(14px);
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
}

.brand-logo { display: block; width: 48px; height: 38px; object-fit: contain; }

.brand-text {
    font-size: 21px;
    font-weight: 800;
    letter-spacing: 2px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 34px;
    color: #d8dfeb;
    font-size: 14px;
}

    .main-nav a {
        transition: color .2s ease;
    }

        .main-nav a:hover {
            color: white;
        }

.nav-contact {
    padding: 10px 17px;
    border: 1px solid rgba(255,255,255,.3);
}

/* Hero */

.hero {
    min-height: 820px;
    padding-top: 76px;
    color: white;
    background: radial-gradient(circle at 78% 35%, rgba(37,99,235,.22), transparent 35%), linear-gradient(135deg, #07101e 0%, #0b1729 55%, #091525 100%);
}

.hero-grid {
    min-height: 744px;
    display: grid;
    grid-template-columns: .85fr 1.15fr;
    align-items: center;
    gap: 75px;
}

.eyebrow,
.section-label {
    margin-bottom: 18px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2.4px;
}

.hero h1 {
    margin: 0;
    font-size: clamp(58px, 6vw, 88px);
    line-height: .95;
    letter-spacing: -4px;
    font-weight: 750;
}

    .hero h1 span {
        color: #4f8cff;
    }

.hero-description {
    max-width: 560px;
    margin: 34px 0 0;
    color: #aab7ca;
    font-size: 18px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 14px;
    margin-top: 38px;
}

.button {
    display: inline-flex;
    min-height: 50px;
    padding: 0 24px;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 650;
    transition: all .2s ease;
}

.button-primary {
    background: var(--primary);
    color: white;
}

    .button-primary:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
    }

.button-secondary {
    border: 1px solid rgba(255,255,255,.27);
    color: white;
}

    .button-secondary:hover {
        background: rgba(255,255,255,.08);
    }

/* Hero Platform Mockup */

.hero-visual {
    position: relative;
}

.platform-window {
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.12);
    background: #121b28;
    box-shadow: 0 40px 90px rgba(0,0,0,.4);
    transform: perspective(1300px) rotateY(-5deg) rotateX(2deg);
}

.window-header {
    height: 42px;
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 0 14px;
    background: #182332;
    border-bottom: 1px solid #283546;
}

.window-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: #526175;
}

.window-title {
    margin-left: 8px;
    color: #8fa0b5;
    font-size: 11px;
}

.window-body {
    min-height: 405px;
    display: grid;
    grid-template-columns: 170px 1fr;
}

.sidebar {
    padding: 22px 14px;
    background: #0d1622;
    border-right: 1px solid #273343;
}

.sidebar-title {
    margin: 0 8px 25px;
    color: white;
    font-weight: 750;
    letter-spacing: 1.7px;
}

.sidebar-item {
    margin-bottom: 7px;
    padding: 11px 12px;
    color: #77889d;
    font-size: 11px;
}

    .sidebar-item.active {
        color: white;
        background: #1f4f99;
    }

.dashboard {
    padding: 28px;
}

.dashboard-title {
    margin-bottom: 22px;
    color: #d6deea;
    font-size: 17px;
    font-weight: 650;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 13px;
}

.stat-card {
    padding: 18px;
    background: #172332;
    border: 1px solid #253448;
}

    .stat-card span {
        display: block;
        color: #8392a6;
        font-size: 10px;
    }

    .stat-card strong {
        display: block;
        margin-top: 8px;
        color: white;
        font-size: 27px;
    }

.device-list {
    margin-top: 20px;
    background: #141f2c;
    border: 1px solid #253448;
}

.device-row {
    display: flex;
    justify-content: space-between;
    padding: 13px 16px;
    color: #a9b5c4;
    font-size: 11px;
    border-bottom: 1px solid #223041;
}

    .device-row:last-child {
        border-bottom: none;
    }

.status-online {
    color: #65d398;
}

.status-offline {
    color: #748196;
}

/* Architecture */

.architecture-section {
    position: relative;
    z-index: 2;
    margin-top: -34px;
}

.architecture {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 130px;
    padding: 24px;
    background: white;
    box-shadow: 0 18px 50px rgba(17,24,39,.09);
}

.architecture-item {
    min-width: 130px;
    text-align: center;
}

    .architecture-item strong {
        display: block;
        font-size: 18px;
    }

    .architecture-item span {
        display: block;
        margin-top: 5px;
        color: var(--muted);
        font-size: 11px;
    }

    .architecture-item.highlight strong {
        color: var(--primary);
    }

.architecture-arrow {
    margin: 0 18px;
    color: #b5bdc9;
    font-size: 25px;
}

/* Common Sections */

.section {
    padding: 125px 0;
}

.section-heading {
    max-width: 750px;
    margin-bottom: 58px;
}

    .section-heading h2 {
        margin: 0;
        font-size: clamp(40px, 4vw, 60px);
        line-height: 1.05;
        letter-spacing: -2.5px;
    }

    .section-heading p {
        max-width: 650px;
        margin: 24px 0 0;
        color: var(--muted);
        font-size: 17px;
        line-height: 1.8;
    }

/* Platform */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 18px;
}

.feature-card {
    min-height: 290px;
    padding: 30px;
    background: white;
    border: 1px solid var(--line);
    transition: transform .25s ease, box-shadow .25s ease;
}

    .feature-card:hover {
        transform: translateY(-7px);
        box-shadow: 0 18px 50px rgba(15,23,42,.08);
    }

.feature-number {
    margin-bottom: 70px;
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
}

.feature-card h3 {
    margin: 0;
    font-size: 21px;
}

.feature-card p {
    margin: 15px 0 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.8;
}

/* Products */

.products-section {
    background: #08111f;
    color: white;
}

.products-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
}

.products-section .section-heading {
    margin-bottom: 58px;
}

    .products-section .section-heading p {
        color: #93a2b7;
    }

.products-all-link {
    margin-bottom: 62px;
    color: #dce6f4;
    font-size: 14px;
    font-weight: 600;
}

    .products-all-link span {
        display: inline-block;
        margin-left: 10px;
        color: #4f8cff;
        transition: transform .2s ease;
    }

    .products-all-link:hover span {
        transform: translateX(5px);
    }

.product-category-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 20px;
}

.product-category-card {
    overflow: hidden;
    background: #101c2c;
    border: 1px solid rgba(255,255,255,.08);
    transition: transform .25s ease, border-color .25s ease;
}

    .product-category-card:hover {
        transform: translateY(-7px);
        border-color: rgba(79,140,255,.5);
    }

.product-category-visual {
    position: relative;
    height: 310px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: radial-gradient(circle at center, #172d49 0%, #0b1726 55%, #07111e 100%);
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.product-size-label {
    position: absolute;
    left: 20px;
    bottom: 18px;
    color: #75869d;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.4px;
}

/* EPD Mockup */

.epd-device {
    padding: 10px;
    background: #e9edf1;
    border: 1px solid #aab2bc;
    box-shadow: 0 24px 55px rgba(0,0,0,.35);
}

.epd-device-small {
    width: 215px;
    height: 145px;
    transform: perspective(800px) rotateY(-8deg) rotateX(4deg);
}

.epd-screen {
    height: 100%;
    padding: 13px;
    color: #161616;
    background: #f4f2e9;
    border: 1px solid #c5c4bc;
}

.epd-screen-label {
    color: #646464;
    font-size: 8px;
    font-weight: 700;
}

.epd-screen-title {
    margin-top: 8px;
    font-size: 22px;
    font-weight: 800;
}

.epd-screen-data {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 8px;
    border-top: 1px solid #a8a8a3;
}

    .epd-screen-data span {
        font-size: 7px;
    }

    .epd-screen-data strong {
        color: #c62020;
        font-size: 10px;
    }

.epd-screen-footer {
    margin-top: 11px;
    color: #555;
    font-size: 7px;
    font-weight: 700;
    letter-spacing: 1px;
}

/* Large Signage */

.epd-device-large {
    width: 205px;
    height: 235px;
    padding: 11px;
    transform: perspective(900px) rotateY(7deg);
}

.large-screen {
    height: 100%;
    padding: 18px;
    color: #151515;
    background: #f1efe6;
    border: 1px solid #c5c4bc;
}

.large-screen-top {
    font-size: 8px;
    font-weight: 700;
}

.large-screen-value {
    margin: 19px 0 23px;
    font-size: 32px;
    font-weight: 800;
}

.large-screen-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 9px 0;
    border-top: 1px solid #aaa;
    font-size: 7px;
}

    .large-screen-row strong {
        font-size: 8px;
    }

/* Gateway */

.gateway-device {
    position: relative;
    z-index: 2;
    width: 190px;
    height: 135px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, #f6f7f8, #cdd3d9);
    border-radius: 10px;
    box-shadow: 0 25px 55px rgba(0,0,0,.4);
    transform: perspective(800px) rotateY(-10deg) rotateX(5deg);
}

.gateway-logo {
    width: 39px;
    height: 39px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    background: #2563eb;
    font-size: 20px;
    font-weight: 800;
}

.gateway-led {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 6px;
    height: 6px;
    background: #2dbd73;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(45,189,115,.8);
}

.gateway-name {
    margin-top: 12px;
    color: #58616d;
    font-size: 8px;
    font-weight: 700;
    letter-spacing: 1.5px;
}

.gateway-signal {
    position: absolute;
    border: 1px solid rgba(79,140,255,.22);
    border-radius: 50%;
}

.signal-1 {
    width: 235px;
    height: 235px;
}

.signal-2 {
    width: 285px;
    height: 285px;
}

.signal-3 {
    width: 345px;
    height: 345px;
}

/* Product Content */

.product-category-content {
    min-height: 305px;
    padding: 30px;
}

.product-category-number {
    color: #4f8cff;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
}

.product-category-content h3 {
    margin: 19px 0 14px;
    font-size: 23px;
}

.product-category-content p {
    min-height: 75px;
    margin: 0;
    color: #8e9db0;
    font-size: 14px;
    line-height: 1.75;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 22px;
}

    .product-tags span {
        padding: 6px 9px;
        color: #8293a9;
        background: rgba(255,255,255,.04);
        border: 1px solid rgba(255,255,255,.08);
        font-size: 9px;
        letter-spacing: .5px;
    }

.product-link {
    display: inline-block;
    margin-top: 27px;
    color: white;
    font-size: 13px;
    font-weight: 600;
}

    .product-link span {
        display: inline-block;
        margin-left: 8px;
        color: #4f8cff;
        transition: transform .2s ease;
    }

    .product-link:hover span {
        transform: translateX(5px);
    }

/* Solutions */

.solutions-section {
    background: #f5f7fa;
}

.solution-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.solution-card {
    min-height: 280px;
    padding: 32px;
    background: white;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    transition: background .2s ease, transform .2s ease;
}

    .solution-card:hover {
        position: relative;
        z-index: 2;
        background: #fbfcfe;
        transform: translateY(-4px);
        box-shadow: 0 20px 45px rgba(15,23,42,.06);
    }

.solution-number {
    color: var(--primary);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
}

.solution-card h3 {
    margin: 48px 0 14px;
    font-size: 22px;
}

.solution-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.8;
}

.solution-keyword {
    margin-top: 28px;
    color: #9ca3af;
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1.2px;
}
/* Technology */

.technology-section {
    padding: 125px 0;
    color: white;
    background: radial-gradient(circle at 15% 20%, rgba(37,99,235,.14), transparent 32%), #101c2e;
}

.technology-grid {
    display: grid;
    grid-template-columns: .85fr 1.15fr;
    gap: 110px;
    align-items: start;
}

.technology-heading {
    position: sticky;
    top: 120px;
}

    .technology-heading h2 {
        margin: 0;
        font-size: clamp(44px, 5vw, 68px);
        line-height: 1;
        letter-spacing: -3px;
    }

    .technology-heading p {
        max-width: 500px;
        margin: 28px 0 0;
        color: #94a3b8;
        font-size: 16px;
        line-height: 1.9;
    }

.technology-list {
    border-top: 1px solid rgba(255,255,255,.14);
}

.technology-item {
    display: grid;
    grid-template-columns: 48px 180px 1fr;
    align-items: center;
    gap: 18px;
    min-height: 112px;
    border-bottom: 1px solid rgba(255,255,255,.14);
    transition: background .2s ease, padding .2s ease;
}

    .technology-item:hover {
        padding-left: 12px;
        background: rgba(255,255,255,.025);
    }

.technology-index {
    color: #4f8cff;
    font-size: 10px;
    font-weight: 700;
}

.technology-name {
    font-size: 20px;
    font-weight: 700;
}

.technology-description {
    color: #8fa0b5;
    font-size: 13px;
    line-height: 1.6;
}
/* Contact */

.contact-section {
    padding: 130px 0;
    color: white;
    background: radial-gradient(circle at 80% 20%, rgba(255,255,255,.12), transparent 30%), linear-gradient(135deg, #1d4ed8 0%, #2563eb 55%, #1e40af 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    align-items: end;
}

.contact-label {
    color: rgba(255,255,255,.65);
}

.contact-heading h2 {
    margin: 0;
    font-size: clamp(46px, 5vw, 72px);
    line-height: 1;
    letter-spacing: -3px;
}

.contact-content {
    padding-bottom: 4px;
}

.contact-lead {
    max-width: 540px;
    margin: 0;
    color: rgba(255,255,255,.82);
    font-size: 17px;
    line-height: 1.9;
}

.contact-actions {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-top: 36px;
}

.contact-primary-button {
    color: var(--primary);
    background: white;
}

    .contact-primary-button:hover {
        background: #f3f6fb;
        transform: translateY(-2px);
    }

.contact-email {
    color: rgba(255,255,255,.9);
    font-size: 14px;
    border-bottom: 1px solid rgba(255,255,255,.35);
    padding-bottom: 4px;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 14px;
    margin-top: 60px;
}

.contact-info-item {
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.22);
}

    .contact-info-item span {
        display: block;
        color: rgba(255,255,255,.55);
        font-size: 9px;
        font-weight: 700;
        letter-spacing: 1.4px;
    }

    .contact-info-item strong {
        display: block;
        margin-top: 8px;
        font-size: 13px;
        font-weight: 650;
    }
/* Footer */

/* Detail Pages */

.detail-hero {
    padding: 190px 0 110px;
    color: white;
    background: radial-gradient(circle at 78% 30%, rgba(37,99,235,.24), transparent 34%), #08111f;
}

.detail-hero-grid {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 90px;
    align-items: end;
}

.detail-hero h1 {
    margin: 0;
    font-size: clamp(50px, 6vw, 82px);
    line-height: 1;
    letter-spacing: -3.5px;
}

.detail-hero p {
    margin: 0;
    color: #9eacc0;
    font-size: 17px;
    line-height: 1.9;
}

.detail-section { padding: 90px 0; background: white; }
.detail-section-alt { background: #f5f7fa; }
.detail-card { display: grid; grid-template-columns: .35fr 1fr; gap: 70px; }
.detail-index { color: var(--primary); font-size: 12px; font-weight: 700; letter-spacing: 1.6px; }
.detail-card h2, .solution-detail-grid h2 { margin: 0; font-size: clamp(34px, 4vw, 52px); letter-spacing: -2px; }
.detail-card p { max-width: 760px; margin: 22px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.detail-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 30px; }
.detail-tags span { padding: 9px 12px; color: #536176; background: #f6f8fb; border: 1px solid var(--line); font-size: 11px; }
.solution-detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.solution-detail-grid article { min-height: 300px; padding: 40px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.solution-detail-grid article > span { color: var(--primary); font-size: 11px; font-weight: 700; }
.solution-detail-grid h2 { margin-top: 54px; font-size: 30px; }
.solution-detail-grid p { color: var(--muted); line-height: 1.85; }
.detail-cta { padding: 90px 0; color: white; background: #101c2e; }
.detail-cta .container { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.detail-cta h2 { max-width: 760px; margin: 0; font-size: clamp(34px, 4vw, 52px); letter-spacing: -2px; }
.error-page { min-height: 72vh; padding: 190px 0 100px; }
.error-page h1 { margin: 0; font-size: clamp(40px, 5vw, 64px); }
.error-page p { margin: 24px 0 34px; color: var(--muted); font-size: 17px; }
.mobile-nav { display: none; position: relative; }
.mobile-nav summary { padding: 10px 14px; color: white; border: 1px solid rgba(255,255,255,.2); cursor: pointer; font-size: 12px; font-weight: 700; list-style: none; }
.mobile-nav summary::-webkit-details-marker { display: none; }
.mobile-nav-panel { position: absolute; top: 48px; right: 0; display: grid; width: 210px; padding: 12px; background: #0b1524; border: 1px solid rgba(255,255,255,.12); box-shadow: 0 20px 50px rgba(0,0,0,.28); }
.mobile-nav-panel a { padding: 13px 12px; color: #dce4ef; text-decoration: none; font-size: 13px; }
.mobile-nav-panel a:hover { color: white; background: rgba(255,255,255,.06); }

.technology-flow { padding: 54px 0; color: white; background: #101c2e; }
.technology-flow-grid { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr; gap: 18px; align-items: center; }
.technology-flow-grid > div { color: #536176; }
.technology-flow-grid article { min-height: 160px; padding: 24px; border: 1px solid rgba(255,255,255,.12); }
.technology-flow-grid article.active { border-color: var(--primary); background: rgba(37,99,235,.12); }
.technology-flow-grid span { display: block; color: #718097; font-size: 10px; font-weight: 700; }
.technology-flow-grid strong { display: block; margin-top: 24px; font-size: 18px; }
.technology-flow-grid p { margin: 10px 0 0; color: #93a1b5; font-size: 12px; line-height: 1.6; }
.technology-capability-grid { display: grid; grid-template-columns: repeat(2,1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.technology-capability-grid article { min-height: 360px; padding: 44px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.technology-capability-grid h2 { margin: 58px 0 0; font-size: clamp(30px,3vw,42px); letter-spacing: -1.5px; }
.technology-capability-grid p { margin: 22px 0 0; color: var(--muted); line-height: 1.9; }
.technology-principles { padding: 110px 0; background: #f5f7fa; }
.principle-list { margin-top: 60px; border-top: 1px solid var(--line); }
.principle-list > div { display: grid; grid-template-columns: 80px .5fr 1fr; gap: 30px; padding: 30px 0; border-bottom: 1px solid var(--line); align-items: center; }
.principle-list span { color: var(--primary); font-size: 11px; font-weight: 700; }
.principle-list strong { font-size: 22px; }
.principle-list p { margin: 0; color: var(--muted); line-height: 1.7; }

.site-footer {
    padding: 42px 0;
    color: #8d99aa;
    background: #050b13;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 2px;
}

.footer-brand img { display: block; width: 42px; height: 33px; object-fit: contain; }

.footer-description {
    margin-top: 6px;
    font-size: 12px;
}

.footer-company {
    font-size: 12px;
    line-height: 1.7;
    text-align: right;
}

/* Responsive */

@media (max-width: 1000px) {
    .main-nav {
        display: none;
    }

    .mobile-nav { display: block; }

    .hero-grid {
        grid-template-columns: 1fr;
        padding: 100px 0;
    }

    .hero-visual {
        margin-top: 20px;
    }

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

    .architecture {
        flex-wrap: wrap;
        gap: 18px;
    }

    .architecture-arrow {
        display: none;
    }

    .product-category-grid {
        grid-template-columns: 1fr 1fr;
    }

    .products-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .products-all-link {
        margin-top: -35px;
        margin-bottom: 50px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 55px;
    }

    .detail-hero-grid { grid-template-columns: 1fr; gap: 35px; }
    .technology-flow-grid { grid-template-columns: repeat(5,1fr); }
    .technology-flow-grid > div { display: none; }
}

@media (max-width: 680px) {
    .container {
        width: min(calc(100% - 30px), var(--max-width));
    }

    .brand-logo { width: 42px; height: 33px; }
    .brand-text { font-size: 18px; }

    .hero h1 {
        font-size: 56px;
        letter-spacing: -3px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .button {
        width: 100%;
    }

    .window-body {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

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

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

    .section {
        padding: 85px 0;
    }

    .product-category-grid {
        grid-template-columns: 1fr;
    }

    .product-category-visual {
        height: 280px;
    }

    .footer-inner {
        align-items: flex-start;
        flex-direction: column;
        gap: 24px;
    }

    .footer-company {
        text-align: left;
    }
    .contact-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .contact-info-grid {
        grid-template-columns: 1fr;
    }

    .contact-primary-button {
        width: 100%;
    }

    .detail-card { grid-template-columns: 1fr; gap: 26px; }
    .solution-detail-grid { grid-template-columns: 1fr; }
    .detail-cta .container { align-items: stretch; flex-direction: column; }
    .technology-flow-grid { grid-template-columns: 1fr; }
    .technology-flow-grid article { min-height: auto; }
    .technology-capability-grid { grid-template-columns: 1fr; }
    .technology-capability-grid article { min-height: auto; padding: 32px 24px; }
    .principle-list > div { grid-template-columns: 50px 1fr; }
    .principle-list p { grid-column: 2; }
}