:root {
    --bg: #020814;
    --panel: rgba(8, 22, 39, 0.78);
    --panel-strong: rgba(6, 16, 31, 0.94);
    --line: rgba(0, 184, 255, 0.42);
    --cyan: #00c8ff;
    --blue: #2f6bff;
    --yellow: #ffd119;
    --text: #f7fbff;
    --muted: #9eb2c8;
    --dark: #02050b;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: radial-gradient(circle at 50% 0%, #082a48 0%, #020814 42%, #01040b 100%);
    color: var(--text);
    font-family: "Noto Sans KR", "Apple SD Gothic Neo", Arial, sans-serif;
    letter-spacing: 0;
}

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

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-height: 78px;
    padding: 18px 44px;
    background: linear-gradient(180deg, rgba(0, 4, 10, 0.92), rgba(0, 4, 10, 0.35));
    backdrop-filter: blur(14px);
}

.brand {
    display: inline-flex;
    flex-direction: column;
    gap: 2px;
    line-height: 1;
}

.brand-main {
    color: var(--cyan);
    font-size: 30px;
    font-weight: 900;
}

.brand-sub {
    color: #6fdfff;
    font-size: 8px;
    font-weight: 700;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 30px;
    font-size: 14px;
    font-weight: 800;
}

.site-nav a {
    color: rgba(255, 255, 255, 0.88);
}

.site-nav a:hover {
    color: var(--cyan);
}

.nav-cta,
.button-primary {
    color: #09111d;
    background: linear-gradient(135deg, #ffe45d, #ffb900);
    box-shadow: 0 0 30px rgba(255, 209, 25, 0.28);
}

.nav-cta {
    padding: 12px 20px;
    border-radius: 999px;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(0, 10, 22, 0.8);
    color: var(--text);
    font-size: 22px;
}

.section {
    position: relative;
    padding: 86px 0;
}

.container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h2 {
    margin-bottom: 34px;
    text-align: center;
    font-size: 32px;
}

h2 strong {
    color: var(--cyan);
}

.hero {
    display: grid;
    min-height: 780px;
    place-items: center;
    overflow: hidden;
    padding-top: 120px;
}

.video-wall {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
    padding: 92px 28px 40px;
    opacity: 0.55;
    transform: perspective(900px) rotateX(7deg);
}

.video-wall::before,
.hero::after {
    position: absolute;
    inset: 0;
    content: "";
}

.video-wall::before {
    z-index: 2;
    background: radial-gradient(circle at 50% 30%, rgba(1, 8, 18, 0.2), rgba(1, 4, 10, 0.96) 72%);
}

.video-wall span {
    min-height: 118px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.02)),
        radial-gradient(circle at 52% 46%, rgba(255, 255, 255, 0.2) 0 16px, transparent 17px),
        linear-gradient(180deg, #202936, #0b111c);
    box-shadow: inset 0 -5px 0 rgba(220, 20, 28, 0.35);
}

.hero::after {
    pointer-events: none;
    background: linear-gradient(180deg, transparent 70%, var(--bg) 100%);
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 900px;
    padding: 0 20px;
    text-align: center;
}

.eyebrow {
    color: var(--cyan);
    font-size: 17px;
    font-weight: 900;
}

.hero h1 {
    margin-bottom: 20px;
    font-size: clamp(42px, 7vw, 78px);
    line-height: 1.12;
}

.hero h1 strong {
    display: inline-block;
    color: var(--cyan);
    font-size: 1.08em;
}

.hero-copy {
    color: rgba(255, 255, 255, 0.9);
    font-size: 22px;
    font-weight: 800;
    line-height: 1.55;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin: 32px 0 54px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 210px;
    min-height: 54px;
    padding: 0 28px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 900;
}

.button-outline,
.button-small {
    border-color: var(--line);
    background: rgba(2, 10, 24, 0.72);
    color: var(--text);
}

.button-small {
    min-width: 180px;
    min-height: 42px;
    color: var(--cyan);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.hero-stats li {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--muted);
    font-weight: 800;
}

.hero-stats strong {
    color: var(--cyan);
}

.problem-section,
.effects-section,
.device-section {
    background: linear-gradient(180deg, rgba(0, 14, 28, 0.1), rgba(0, 105, 170, 0.08), rgba(0, 14, 28, 0.1));
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.glass-card,
.solution-card,
.feature-card,
.effect-card,
.contact-panel,
.admin-card,
.admin-panel {
    border: 1px solid rgba(0, 184, 255, 0.3);
    border-radius: 8px;
    background: linear-gradient(145deg, rgba(8, 25, 45, 0.84), rgba(4, 10, 22, 0.88));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 18px 60px rgba(0, 0, 0, 0.28);
}

.glass-card,
.solution-card {
    min-height: 220px;
    padding: 32px 24px;
    text-align: center;
}

.glass-card h3,
.solution-card h3,
.feature-card h3,
.effect-card h3 {
    margin-bottom: 12px;
}

.glass-card p,
.solution-card p,
.feature-card p,
.effect-card p,
.device-section p,
.contact-panel p {
    color: var(--muted);
    line-height: 1.65;
}

.card-icon,
.effect-icon {
    margin: 0 auto 22px;
    color: var(--cyan);
    font-size: 42px;
}

.solution-card {
    border-color: rgba(0, 200, 255, 0.78);
    box-shadow: 0 0 32px rgba(0, 200, 255, 0.22);
    text-align: left;
}

.solution-card span {
    color: var(--cyan);
    font-weight: 900;
}

.solution-card h3 {
    margin-top: 18px;
    font-size: 26px;
    line-height: 1.35;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.feature-card {
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 20px;
    min-height: 132px;
    padding: 26px;
}

.line-icon {
    position: relative;
    width: 58px;
    height: 58px;
    border: 2px solid var(--cyan);
    border-radius: 8px;
    box-shadow: 0 0 22px rgba(0, 200, 255, 0.2);
}

.line-icon::after {
    position: absolute;
    inset: 18px;
    border: 2px solid var(--cyan);
    border-radius: 50%;
    content: "";
}

.line-icon-music::after,
.line-icon-wave::after {
    border-radius: 4px;
    transform: rotate(45deg);
}

.line-icon-grid::after {
    inset: 10px;
    border-radius: 0;
    box-shadow: 16px 0 0 -1px transparent, 0 16px 0 -1px transparent;
}

.program-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.program-card {
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    min-height: 214px;
    overflow: hidden;
    padding: 24px 12px;
    border: 1px solid rgba(0, 184, 255, 0.48);
    border-radius: 6px;
    background:
        linear-gradient(180deg, rgba(1, 8, 18, 0.18), rgba(1, 8, 18, 0.82)),
        linear-gradient(135deg, #334454, #091522);
    text-align: center;
}

.program-card h3 {
    margin-bottom: 2px;
    font-size: 19px;
}

.program-card p {
    color: var(--cyan);
    font-size: 11px;
    font-weight: 900;
}

.play-mark {
    position: absolute;
    left: 50%;
    bottom: 28px;
    width: 42px;
    height: 42px;
    border: 3px solid var(--cyan);
    border-radius: 50%;
    transform: translateX(-50%);
}

.play-mark::after {
    position: absolute;
    top: 11px;
    left: 15px;
    width: 0;
    height: 0;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    border-left: 12px solid var(--cyan);
    content: "";
}

.center-action {
    margin-top: 28px;
    text-align: center;
}

.effect-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
}

.effect-card {
    min-height: 190px;
    padding: 28px 18px;
    text-align: center;
}

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

.device-stage {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr 1fr;
    align-items: end;
    gap: 70px;
    margin-top: 42px;
}

.device {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    min-height: 210px;
    border: 1px solid rgba(0, 184, 255, 0.34);
    border-radius: 8px;
    background:
        linear-gradient(180deg, rgba(10, 24, 40, 0.1), rgba(5, 14, 26, 0.85)),
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px 42px);
    box-shadow: 0 26px 60px rgba(0, 0, 0, 0.38);
}

.device span {
    display: block;
    width: 100%;
    padding: 18px;
    color: var(--muted);
    font-weight: 900;
}

.tablet {
    min-height: 170px;
}

.laptop {
    min-height: 190px;
}

.contact-panel {
    display: grid;
    grid-template-columns: 1.1fr 1fr 0.9fr;
    gap: 28px;
    align-items: center;
    padding: 44px;
    border-color: rgba(0, 184, 255, 0.7);
}

.contact-panel h2 {
    margin-bottom: 14px;
    text-align: left;
}

.contact-points {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    color: var(--cyan);
    font-size: 13px;
    font-weight: 900;
    text-align: center;
}

.contact-points span {
    padding: 18px 10px;
    border: 1px solid rgba(0, 184, 255, 0.22);
    border-radius: 8px;
}

.contact-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.contact-action strong {
    color: #39a8ff;
    font-size: 24px;
}

.contact-action small {
    color: var(--muted);
}

.site-footer {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 36px;
    align-items: center;
    padding: 34px 44px;
    background: #01040b;
    color: var(--muted);
}

.site-footer nav {
    display: flex;
    gap: 34px;
    font-size: 13px;
}

.site-footer p {
    margin: 0;
    font-size: 13px;
}

.admin-body {
    display: grid;
    grid-template-columns: 270px 1fr;
    min-height: 100vh;
}

.admin-sidebar {
    padding: 28px;
    border-right: 1px solid rgba(0, 184, 255, 0.22);
    background: rgba(1, 6, 14, 0.94);
}

.admin-menu {
    display: grid;
    gap: 8px;
    margin-top: 42px;
}

.admin-menu a {
    padding: 14px 16px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 800;
}

.admin-menu a.active,
.admin-menu a:hover {
    background: rgba(0, 184, 255, 0.12);
    color: var(--cyan);
}

.admin-main {
    padding: 36px;
}

.admin-topbar {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: center;
    margin-bottom: 26px;
}

.admin-topbar p {
    margin-bottom: 6px;
    color: var(--cyan);
    font-weight: 900;
}

.admin-topbar h1 {
    margin: 0;
    font-size: 34px;
}

.admin-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.admin-card {
    padding: 24px;
}

.admin-card span {
    color: var(--muted);
    font-weight: 800;
}

.admin-card strong {
    display: block;
    margin: 12px 0;
    color: var(--cyan);
    font-size: 42px;
}

.admin-card p {
    margin: 0;
    color: var(--muted);
}

.admin-panel {
    margin-top: 24px;
    padding: 28px;
}

.admin-panel h2 {
    margin-bottom: 10px;
    text-align: left;
}

.admin-task-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 22px;
}

.admin-task-list span {
    padding: 14px;
    border: 1px solid rgba(0, 184, 255, 0.24);
    border-radius: 8px;
    color: var(--muted);
}

@media (max-width: 980px) {
    .site-header {
        padding: 14px 20px;
    }

    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .site-nav {
        position: absolute;
        top: 72px;
        right: 20px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        width: min(320px, calc(100vw - 40px));
        padding: 18px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: rgba(2, 8, 18, 0.96);
    }

    .site-nav.is-open {
        display: flex;
    }

    .hero-stats,
    .problem-grid,
    .feature-grid,
    .program-grid,
    .effect-grid,
    .device-stage,
    .contact-panel,
    .admin-grid,
    .admin-task-list {
        grid-template-columns: 1fr 1fr;
    }

    .solution-card {
        grid-column: span 2;
    }

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

    .admin-sidebar {
        border-right: 0;
        border-bottom: 1px solid rgba(0, 184, 255, 0.22);
    }
}

@media (max-width: 640px) {
    .brand-main {
        font-size: 24px;
    }

    .hero {
        min-height: 720px;
    }

    .video-wall {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero-actions,
    .site-footer,
    .admin-topbar {
        flex-direction: column;
    }

    .hero-actions {
        display: grid;
    }

    .button {
        width: 100%;
    }

    .hero-stats,
    .problem-grid,
    .feature-grid,
    .program-grid,
    .effect-grid,
    .device-stage,
    .contact-panel,
    .contact-points,
    .admin-grid,
    .admin-task-list,
    .site-footer {
        grid-template-columns: 1fr;
    }

    .solution-card {
        grid-column: auto;
    }

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

    .site-footer {
        padding: 30px 20px;
    }

    .site-footer nav {
        flex-direction: column;
        gap: 14px;
    }
}