:root {
    --bg: #050816;
    --bg2: #0b1224;
    --panel: rgba(15, 23, 42, 0.78);
    --panel2: rgba(30, 41, 59, 0.72);
    --border: rgba(148, 163, 184, 0.22);
    --text: #f8fafc;
    --muted: #aab6ca;
    --soft: #64748b;
    --accent: #38bdf8;
    --accent2: #a855f7;
    --accent3: #22c55e;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background: var(--bg);
}

body {
    margin: 0;
    min-height: 100vh;
    background:
            radial-gradient(circle at 14% 12%, rgba(168, 85, 247, 0.30), transparent 28%),
            radial-gradient(circle at 82% 16%, rgba(56, 189, 248, 0.24), transparent 30%),
            radial-gradient(circle at 50% 85%, rgba(34, 197, 94, 0.11), transparent 35%),
            linear-gradient(180deg, #050816 0%, #07111f 100%);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.65;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: -20%;
    z-index: -3;
    background:
            radial-gradient(circle at 20% 20%, rgba(168, 85, 247, 0.22), transparent 28%),
            radial-gradient(circle at 78% 18%, rgba(56, 189, 248, 0.18), transparent 30%),
            radial-gradient(circle at 45% 80%, rgba(34, 197, 94, 0.10), transparent 26%);
    filter: blur(48px);
    transform: translateZ(0);
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background-image:
            linear-gradient(rgba(255,255,255,0.038) 1px, transparent 1px),
            linear-gradient(90deg, rgba(255,255,255,0.038) 1px, transparent 1px);
    background-size: 54px 54px;
    -webkit-mask-image: radial-gradient(circle at center, black 0%, black 46%, transparent 78%);
    mask-image: radial-gradient(circle at center, black 0%, black 46%, transparent 78%);
}

.site-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
            linear-gradient(180deg, rgba(5, 8, 22, 0.10), rgba(5, 8, 22, 0.84)),
            radial-gradient(circle at 8% 24%, rgba(168, 85, 247, 0.18), transparent 26%),
            radial-gradient(circle at 82% 20%, rgba(56, 189, 248, 0.16), transparent 30%);
}

.site-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
            radial-gradient(circle at top, transparent 0%, rgba(5, 8, 22, 0.42) 72%),
            linear-gradient(90deg, rgba(5, 8, 22, 0.25), transparent 50%, rgba(5, 8, 22, 0.25));
}

.site-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
            radial-gradient(circle at 1px 1px, rgba(255,255,255,0.10) 1px, transparent 0);
    background-size: 28px 28px;
    opacity: 0.11;
    -webkit-mask-image: radial-gradient(circle at 50% 22%, black 0%, transparent 68%);
    mask-image: radial-gradient(circle at 50% 22%, black 0%, transparent 68%);
}

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

a:hover {
    color: white;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: center;
    padding: 18px 6vw;
    background: rgba(5, 8, 22, 0.76);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    gap: 12px;
    align-items: center;
    color: white;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background:
            radial-gradient(circle at 30% 20%, white, transparent 22%),
            linear-gradient(135deg, var(--accent), var(--accent2));
    box-shadow:
            0 0 26px rgba(168, 85, 247, 0.45),
            0 0 50px rgba(56, 189, 248, 0.18);
}

.brand strong {
    display: block;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.brand small {
    display: block;
    color: var(--muted);
    font-size: 0.78rem;
    margin-top: -4px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.site-nav a {
    color: var(--muted);
    font-size: 0.95rem;
}

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

.nav-cta {
    padding: 9px 14px;
    border-radius: 999px;
    color: white !important;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    box-shadow: 0 0 22px rgba(56, 189, 248, 0.28);
}

.hero {
    position: relative;
    padding: 92px 6vw 62px;
    max-width: 1180px;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -160px -12vw auto -12vw;
    height: 420px;
    z-index: -1;
    pointer-events: none;
    background:
            radial-gradient(circle at 24% 40%, rgba(168, 85, 247, 0.20), transparent 36%),
            radial-gradient(circle at 62% 30%, rgba(56, 189, 248, 0.14), transparent 40%);
    filter: blur(74px);
}

.hero-split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
    gap: 42px;
    align-items: center;
    max-width: 1500px;
}

.hero h1 {
    margin: 0 0 22px;
    font-size: clamp(3rem, 8vw, 6.5rem);
    line-height: 0.95;
    letter-spacing: -0.07em;
    background: linear-gradient(90deg, #ffffff 0%, #7dd3fc 40%, #a855f7 78%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero .lead,
.hero > p,
.section-heading p,
.cta-panel p {
    color: var(--muted);
    font-size: 1.18rem;
    max-width: 850px;
}

.badge,
.eyebrow {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    gap: 8px;
    color: #e9d5ff;
    background: rgba(168, 85, 247, 0.13);
    border: 1px solid rgba(168, 85, 247, 0.34);
    padding: 6px 12px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.74rem;
    font-weight: 800;
    box-shadow: 0 0 22px rgba(168, 85, 247, 0.12);
}

.actions {
    display: flex;
    gap: 14px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 18px;
    border-radius: 14px;
    color: #020617;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    font-weight: 800;
    box-shadow:
            0 16px 44px rgba(56, 189, 248, 0.25),
            inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.button:hover {
    color: white;
    transform: translateY(-1px);
}

.button.secondary {
    color: white;
    background: rgba(30, 41, 59, 0.85);
    border: 1px solid var(--border);
    box-shadow: none;
}

.button.ghost {
    color: white;
    background: transparent;
    border: 1px solid var(--border);
    box-shadow: none;
}

.hero-panel,
.card,
.cta-panel {
    background:
            linear-gradient(180deg, rgba(255,255,255,0.045), transparent 42%),
            var(--panel);
    border: 1px solid var(--border);
    border-radius: 26px;
    box-shadow: var(--shadow);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.hero-panel {
    position: relative;
    overflow: hidden;
    transform: perspective(1200px) rotateY(-5deg) rotateX(2deg);
}

.hero-panel::before {
    content: "";
    position: absolute;
    inset: -1px;
    pointer-events: none;
    background:
            linear-gradient(135deg, rgba(56, 189, 248, 0.45), transparent 35%, rgba(168, 85, 247, 0.38));
    opacity: 0.18;
}

.terminal-bar {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    background: rgba(2, 6, 23, 0.74);
}

.terminal-bar span {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--accent2);
}

.terminal-bar span:nth-child(2) {
    background: #f59e0b;
}

.terminal-bar span:nth-child(3) {
    background: var(--accent3);
}

.terminal-bar strong {
    margin-left: 8px;
    color: var(--muted);
    font-size: 0.85rem;
}

.mock-grid {
    display: grid;
    gap: 12px;
    padding: 18px;
}

.mini-card {
    padding: 14px;
    border-radius: 16px;
    background: rgba(15, 23, 42, 0.88);
    border: 1px solid rgba(148, 163, 184, 0.16);
}

.mini-card strong,
.mini-card small {
    display: block;
}

.mini-card small {
    color: var(--muted);
    margin-top: 4px;
}

.section {
    padding: 52px 6vw;
}

.section.narrow {
    max-width: 1040px;
}

.section-heading {
    margin-bottom: 26px;
}

.section h2 {
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.05;
    margin: 12px 0 14px;
    letter-spacing: -0.04em;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.card {
    padding: 24px;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: rgba(56, 189, 248, 0.45);
    background:
            linear-gradient(180deg, rgba(255,255,255,0.055), transparent 42%),
            rgba(15, 23, 42, 0.92);
    box-shadow:
            0 26px 90px rgba(0, 0, 0, 0.50),
            0 0 30px rgba(56, 189, 248, 0.08);
}

.card h3,
.card h2 {
    margin-top: 0;
}

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

.roadmap-version + .roadmap-version {
    margin-top: 24px;
}

.roadmap-version ul {
    padding-left: 20px;
}

.roadmap-version li {
    margin-bottom: 8px;
}

.roadmap-done a {
    color: var(--muted);
    text-decoration: line-through;
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 14px;
}

.feature-icon.large {
    font-size: 4rem;
}

.content-card {
    max-width: 980px;
}

.tag-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tag-list span {
    padding: 7px 11px;
    border-radius: 999px;
    color: var(--muted);
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid var(--border);
}

.download-card {
    min-height: 220px;
}

.screenshot-placeholder {
    display: grid;
    place-items: center;
    min-height: 180px;
    margin-bottom: 16px;
    border-radius: 18px;
    background:
            linear-gradient(135deg, rgba(56, 189, 248, 0.20), rgba(168, 85, 247, 0.20)),
            rgba(2, 6, 23, 0.7);
    border: 1px solid var(--border);
    color: white;
    font-weight: 800;
}

.cta-panel {
    padding: clamp(28px, 5vw, 60px);
}

.manual-content {
    max-width: 980px;
}

.manual-content h1,
.manual-content h2,
.manual-content h3 {
    line-height: 1.2;
}

.manual-content pre {
    overflow-x: auto;
    padding: 16px;
    border-radius: 14px;
    background: #020617;
}

.manual-content code {
    color: #bae6fd;
}

.manual-content table {
    width: 100%;
    border-collapse: collapse;
    overflow-x: auto;
}

.manual-content th,
.manual-content td {
    border-bottom: 1px solid rgba(148, 163, 184, 0.22);
    padding: 10px;
    text-align: left;
}

.site-footer {
    padding: 42px 6vw;
    color: var(--muted);
    border-top: 1px solid var(--border);
}

@media (max-width: 900px) {
    .hero-split {
        grid-template-columns: 1fr;
    }

    .hero-panel {
        transform: none;
    }

    .site-header {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: no-preference) {
    .button,
    .card {
        transition: all 180ms ease;
    }
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 24px;
}

.footer-grid strong {
    color: white;
}

.footer-grid p {
    margin: 8px 0;
}

@media (max-width: 800px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}
/* ================================================================
   KST4Contest brand recovery: green operator-console identity
   and full-screen interactive hero
   ================================================================ */

:root {
    --bg: #050806;
    --bg2: #0b140f;
    --panel: rgba(15, 28, 20, 0.82);
    --panel2: rgba(24, 43, 31, 0.84);
    --border: rgba(125, 178, 134, 0.22);
    --text: #f4f7f3;
    --muted: #a9b8ad;
    --soft: #6e8173;
    --accent: #54d63d;
    --accent2: #8aef64;
    --accent3: #31b54a;
    --fx-plane: #79ff73;
    --fx-plane-muted: rgba(121, 255, 115, 0.42);
    --fx-beam: #52ff65;
    --fx-beam-glow: rgba(82, 255, 101, 0.28);
    --fx-reflection: #d2ffc8;
    --fx-trail: rgba(121, 255, 115, 0.17);
    --fx-grid: rgba(121, 255, 115, 0.055);
}

body {
    background:
            radial-gradient(circle at 14% 12%, rgba(52, 165, 57, 0.20), transparent 30%),
            radial-gradient(circle at 82% 16%, rgba(95, 218, 82, 0.14), transparent 32%),
            radial-gradient(circle at 50% 85%, rgba(32, 126, 55, 0.12), transparent 36%),
            linear-gradient(180deg, #070b09 0%, #0b1410 100%);
}

body::before {
    background:
            radial-gradient(circle at 20% 20%, rgba(60, 173, 61, 0.18), transparent 28%),
            radial-gradient(circle at 78% 18%, rgba(97, 222, 80, 0.13), transparent 30%),
            radial-gradient(circle at 45% 80%, rgba(34, 122, 53, 0.11), transparent 26%);
}

body::after {
    background-image:
            linear-gradient(rgba(160,255,160,0.032) 1px, transparent 1px),
            linear-gradient(90deg, rgba(160,255,160,0.032) 1px, transparent 1px);
}

.site-bg {
    background:
            linear-gradient(180deg, rgba(5, 8, 6, 0.10), rgba(5, 8, 6, 0.84)),
            radial-gradient(circle at 8% 24%, rgba(52, 165, 57, 0.14), transparent 26%),
            radial-gradient(circle at 82% 20%, rgba(95, 218, 82, 0.12), transparent 30%);
}

.site-header {
    background: rgba(5, 8, 7, 0.82);
}

.brand-mark,
.nav-cta,
.button {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
}

.brand-mark {
    box-shadow:
            0 0 26px rgba(84, 214, 61, 0.42),
            0 0 50px rgba(49, 181, 74, 0.16);
}

.nav-cta {
    color: #061008 !important;
    box-shadow: 0 0 22px rgba(84, 214, 61, 0.28);
}

main {
    width: 100%;
}

.hero.hero-split {
    position: relative;
    width: 100%;
    max-width: none;
    min-height: calc(100vh - 73px);
    display: grid;
    grid-template-columns: minmax(420px, 0.9fr) minmax(520px, 1.1fr);
    gap: clamp(40px, 5vw, 110px);
    align-items: center;
    align-content: center;
    padding: clamp(56px, 7vh, 100px) clamp(28px, 6vw, 110px);
    overflow: hidden;
}

.hero.hero-split > *:not(.hero-radio-fx):not(.hero-fx-vignette) {
    position: relative;
    z-index: 3;
}

.hero-copy {
    max-width: 760px;
}

.hero.hero-split h1 {
    font-size: clamp(3.4rem, 8vw, 7rem);
    background: linear-gradient(90deg, #ffffff 0%, #c9ffd0 28%, #77ec70 58%, #45bd4d 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.badge,
.eyebrow {
    color: #caffc0;
    background: rgba(52, 165, 57, 0.12);
    border-color: rgba(105, 232, 88, 0.32);
    box-shadow: 0 0 22px rgba(82, 255, 101, 0.08);
}

.button {
    color: #041007;
    box-shadow:
            0 16px 44px rgba(84, 214, 61, 0.22),
            inset 0 1px 0 rgba(255,255,255,0.35);
}

.button.secondary {
    color: white;
    background: rgba(28, 43, 32, 0.90);
}

.hero-panel {
    width: min(100%, 760px);
    justify-self: center;
    transform: perspective(1200px) rotateY(-4deg) rotateX(1.5deg);
}

.hero-panel,
.card,
.cta-panel {
    background:
            linear-gradient(180deg, rgba(255,255,255,0.045), transparent 42%),
            rgba(15, 28, 20, 0.82);
}

.mini-card {
    background: rgba(12, 25, 17, 0.88);
    border-color: rgba(148, 184, 155, 0.16);
}

.card:hover {
    border-color: rgba(84, 214, 61, 0.42);
    background:
            linear-gradient(180deg, rgba(255,255,255,0.055), transparent 42%),
            rgba(12, 25, 17, 0.94);
    box-shadow:
            0 26px 90px rgba(0,0,0,0.50),
            0 0 30px rgba(84,214,61,0.07);
}

.hero-radio-fx {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.78;
}

.hero-fx-vignette {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background:
            linear-gradient(90deg,
            rgba(7,11,9,0.92) 0%,
            rgba(7,11,9,0.70) 32%,
            rgba(7,11,9,0.17) 62%,
            rgba(7,11,9,0.38) 100%),
            linear-gradient(180deg,
            rgba(7,11,9,0.08),
            rgba(7,11,9,0.58));
}

html[data-theme="light"] {
    --bg: #f4f4f2;
    --bg2: #ffffff;
    --panel: rgba(255,255,255,0.90);
    --panel2: rgba(242,242,239,0.94);
    --border: rgba(91,91,86,0.20);
    --text: #252522;
    --muted: #656560;
    --soft: #888881;
    --accent: #d33732;
    --accent2: #f25a51;
    --accent3: #ae2727;
    --fx-plane: #df3732;
    --fx-plane-muted: rgba(211,55,50,0.38);
    --fx-beam: #ef4039;
    --fx-beam-glow: rgba(239,64,57,0.22);
    --fx-reflection: #ff8d84;
    --fx-trail: rgba(211,55,50,0.15);
    --fx-grid: rgba(185,47,43,0.045);
}

@media (min-width: 1600px) {
    .hero.hero-split {
        grid-template-columns: minmax(520px, 0.85fr) minmax(620px, 1.15fr);
    }

    .hero-panel {
        width: min(100%, 820px);
    }
}

@media (max-width: 1000px) {
    .hero.hero-split {
        min-height: auto;
        grid-template-columns: 1fr;
        padding-top: 64px;
        padding-bottom: 64px;
    }

    .hero-panel {
        width: min(100%, 760px);
        transform: none;
    }

    .hero-radio-fx {
        opacity: 0.50;
    }

    .hero-fx-vignette {
        background: linear-gradient(180deg, rgba(7,11,9,0.84), rgba(7,11,9,0.34));
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-radio-fx {
        opacity: 0.28;
    }
}