@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
    --bg: #030814;
    --panel: #081321;
    --panel2: #0d1a2c;
    --cyan: #00f0ff;
    --blue: #4b7cff;
    --pink: #ff3cac;
    --text: #effaff;
    --muted: #8da2b8;
    --line: #18324a;
    --green: #44ff9a;
    --yellow: #ffc857
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Space Grotesk", system-ui, sans-serif;
    line-height: 1.6;
    overflow-x: hidden
}

body:before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(rgba(0, 240, 255, .025) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 240, 255, .025) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: linear-gradient(to bottom, black, transparent 75%);
    z-index: -2
}

body:after {
    content: "";
    position: fixed;
    width: 48rem;
    height: 48rem;
    right: -25rem;
    top: -22rem;
    background: var(--cyan);
    filter: blur(180px);
    opacity: .09;
    z-index: -1
}

.mono,
code,
.eyebrow,
.btn,
.nav,
.tag,
.stat b {
    font-family: "JetBrains Mono", monospace
}

.wrap {
    width: min(1180px, calc(100% - 40px));
    margin: auto
}

.skip {
    position: fixed;
    left: 1rem;
    top: -5rem;
    background: var(--cyan);
    color: #001014;
    padding: .6rem 1rem;
    z-index: 100
}

.skip:focus {
    top: 1rem
}

.nav-shell {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(3, 8, 20, .82);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 240, 255, .15)
}

.nav {
    height: 72px;
    display: flex;
    align-items: center;
    gap: 28px;
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .04em
}

.brand {
    margin-right: auto;
    color: white;
    text-decoration: none;
    font: 700 1rem "Space Grotesk"
}

.brand i {
    font-style: normal;
    color: var(--cyan);
    text-shadow: 0 0 16px var(--cyan)
}

.nav a {
    color: var(--muted);
    text-decoration: none;
    transition: .2s
}

.nav a:hover,
.nav a.active {
    color: var(--cyan)
}

.menu {
    display: none;
    border: 0;
    background: none;
    color: var(--cyan);
    font-size: 1.4rem
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .6rem;
    padding: .82rem 1.15rem;
    border: 1px solid var(--cyan);
    background: rgba(0, 240, 255, .08);
    color: var(--cyan);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: .06em;
    font-size: .77rem;
    font-weight: 700;
    cursor: pointer;
    transition: .2s
}

.btn:hover {
    background: var(--cyan);
    color: #001014;
    box-shadow: 0 0 26px rgba(0, 240, 255, .3);
    transform: translateY(-2px)
}

.btn.ghost {
    border-color: var(--line);
    background: transparent;
    color: var(--muted)
}

.btn.ghost:hover {
    color: white;
    border-color: white
}

.hero {
    min-height: calc(100vh - 72px);
    display: grid;
    place-items: center;
    text-align: center;
    position: relative;
    padding: 80px 0
}

.hero-copy {
    max-width: 920px
}

.eyebrow {
    color: var(--cyan);
    font-size: .78rem;
    letter-spacing: .2em;
    text-transform: uppercase
}

.eyebrow:before {
    content: "[ "
}

.eyebrow:after {
    content: " ]"
}

h1 {
    font-size: clamp(3.4rem, 10vw, 8.5rem);
    line-height: .84;
    letter-spacing: -.07em;
    margin: .35em 0 .2em;
    text-transform: uppercase
}

h1 span,
.accent {
    color: transparent;
    -webkit-text-stroke: 1px var(--cyan);
    text-shadow: 0 0 30px rgba(0, 240, 255, .18)
}

.hero p {
    max-width: 680px;
    margin: 1.5rem auto;
    color: var(--muted);
    font-size: 1.1rem
}

.actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem
}

.terminal {
    max-width: 560px;
    margin: 3rem auto 0;
    text-align: left;
    border: 1px solid var(--line);
    background: rgba(8, 19, 33, .8);
    box-shadow: 0 20px 80px rgba(0, 0, 0, .35)
}

.terminal-top {
    padding: .65rem 1rem;
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    font: .68rem "JetBrains Mono"
}

.terminal-body {
    padding: 1.1rem 1.3rem;
    font: .8rem/1.8 "JetBrains Mono";
    color: var(--muted)
}

.terminal-body b {
    color: var(--green)
}

.cursor {
    display: inline-block;
    width: 8px;
    height: 1em;
    background: var(--cyan);
    vertical-align: middle;
    animation: blink 1s steps(1) infinite
}

@keyframes blink {
    50% {
        opacity: 0
    }
}

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-block: 1px solid var(--line);
    background: rgba(8, 19, 33, .5)
}

.stat {
    padding: 30px;
    text-align: center;
    border-right: 1px solid var(--line)
}

.stat:last-child {
    border: 0
}

.stat b {
    display: block;
    color: var(--cyan);
    font-size: 1.8rem
}

.stat span {
    color: var(--muted);
    font-size: .78rem;
    text-transform: uppercase;
    letter-spacing: .12em
}

.section {
    padding: 100px 0
}

.section.alt {
    background: rgba(8, 19, 33, .42);
    border-block: 1px solid rgba(24, 50, 74, .6)
}

.section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 25px;
    margin-bottom: 36px
}

.section-head h2,
.page-hero h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: -.04em;
    margin: .2rem 0;
    line-height: 1
}

.section-head p,
.lead {
    color: var(--muted);
    max-width: 620px
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px
}

.card {
    position: relative;
    background: linear-gradient(145deg, rgba(13, 26, 44, .9), rgba(5, 13, 25, .9));
    border: 1px solid var(--line);
    padding: 26px;
    min-height: 190px;
    transition: .25s
}

.card:before {
    content: "";
    position: absolute;
    left: -1px;
    top: -1px;
    width: 22px;
    height: 2px;
    background: var(--cyan)
}

.card:hover {
    border-color: rgba(0, 240, 255, .5);
    transform: translateY(-4px)
}

.card h3 {
    margin: .5rem 0;
    font-size: 1.15rem
}

.card p {
    color: var(--muted);
    font-size: .92rem
}

.icon {
    font: 700 1.6rem "JetBrains Mono";
    color: var(--cyan)
}

.tag {
    display: inline-block;
    padding: .2rem .5rem;
    border: 1px solid var(--line);
    color: var(--muted);
    font-size: .65rem;
    text-transform: uppercase;
    margin: .2rem
}

.tag.easy {
    color: var(--green);
    border-color: rgba(68, 255, 154, .3)
}

.tag.medium {
    color: var(--yellow);
    border-color: rgba(255, 200, 87, .3)
}

.tag.hard {
    color: var(--pink);
    border-color: rgba(255, 60, 172, .3)
}

.page-hero {
    padding: 110px 0 70px;
    border-bottom: 1px solid var(--line)
}

.page-hero h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    text-transform: uppercase
}

.crumb {
    color: var(--muted);
    font: .72rem "JetBrains Mono";
    text-transform: uppercase
}

.crumb b {
    color: var(--cyan)
}

.timeline {
    border-left: 1px solid var(--line);
    margin-left: 12px;
    padding-left: 34px
}

.event {
    position: relative;
    margin-bottom: 36px
}

.event:before {
    content: "";
    position: absolute;
    width: 11px;
    height: 11px;
    border: 2px solid var(--cyan);
    background: var(--bg);
    left: -40px;
    top: 6px;
    box-shadow: 0 0 12px var(--cyan)
}

.event time {
    font: .75rem "JetBrains Mono";
    color: var(--cyan)
}

.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px
}

.rules {
    counter-reset: rule
}

.rule {
    counter-increment: rule;
    display: grid;
    grid-template-columns: 58px 1fr;
    border-bottom: 1px solid var(--line);
    padding: 24px 0
}

.rule:before {
    content: "0" counter(rule);
    font: 700 1rem "JetBrains Mono";
    color: var(--cyan)
}

.rule h3 {
    margin: 0
}

.rule p {
    margin: .4rem 0;
    color: var(--muted)
}

details {
    border-bottom: 1px solid var(--line);
    padding: 20px 4px
}

summary {
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    gap: 15px
}

summary:after {
    content: "+";
    color: var(--cyan);
    font: 1.2rem "JetBrains Mono"
}

details[open] summary:after {
    content: "−"
}

details p {
    color: var(--muted);
    max-width: 820px
}

.score {
    width: 100%;
    border-collapse: collapse
}

.score th,
.score td {
    text-align: left;
    border-bottom: 1px solid var(--line);
    padding: 17px 14px
}

.score th {
    color: var(--muted);
    font: .68rem "JetBrains Mono";
    text-transform: uppercase
}

.score td:first-child {
    color: var(--cyan);
    font-family: "JetBrains Mono"
}

.bar {
    height: 5px;
    background: var(--line);
    width: 160px
}

.bar i {
    display: block;
    height: 100%;
    background: var(--cyan);
    box-shadow: 0 0 10px var(--cyan)
}

.notice {
    border: 1px solid rgba(255, 200, 87, .3);
    background: rgba(255, 200, 87, .06);
    color: var(--yellow);
    padding: 16px 20px;
    font: .78rem "JetBrains Mono"
}

.cta {
    padding: 70px 30px;
    text-align: center;
    border: 1px solid var(--line);
    background: radial-gradient(circle at center, rgba(0, 240, 255, .09), transparent 65%)
}

.cta h2 {
    font-size: clamp(2rem, 5vw, 3.6rem);
    margin: .2em
}

.footer {
    border-top: 1px solid var(--line);
    padding: 45px 0 25px;
    background: #02060d
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px
}

.footer a {
    display: block;
    color: var(--muted);
    text-decoration: none;
    margin: .45rem 0
}

.footer a:hover {
    color: var(--cyan)
}

.fine {
    border-top: 1px solid var(--line);
    margin-top: 35px;
    padding-top: 20px;
    color: #51667b;
    font: .7rem "JetBrains Mono"
}

.toast {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 50;
    padding: 15px 20px;
    border: 1px solid var(--cyan);
    background: var(--panel);
    color: var(--cyan);
    font: .75rem "JetBrains Mono";
    transform: translateY(140%);
    transition: .25s
}

.toast.show {
    transform: translateY(0)
}

@media(max-width:900px) {
    .nav {
        height: auto;
        min-height: 66px;
        flex-wrap: wrap;
        padding: 15px 0
    }

    .menu {
        display: block
    }

    .nav-links {
        display: none;
        width: 100%;
        padding: 12px 0
    }

    .nav-links.open {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 12px
    }

    .nav .nav-cta {
        margin-left: auto
    }

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

    .stats {
        grid-template-columns: 1fr 1fr
    }

    .stat:nth-child(2) {
        border-right: 0
    }

    .split {
        grid-template-columns: 1fr
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr
    }

    .footer-grid>div:first-child {
        grid-column: 1/-1
    }
}

@media(max-width:600px) {
    .wrap {
        width: min(100% - 28px, 1180px)
    }

    .nav-cta {
        display: none
    }

    .hero {
        padding: 60px 0;
        min-height: 780px
    }

    h1 {
        font-size: 3.7rem
    }

    .section {
        padding: 72px 0
    }

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

    .stats {
        grid-template-columns: 1fr 1fr
    }

    .stat {
        padding: 20px 10px
    }

    .section-head {
        align-items: start;
        flex-direction: column
    }

    .page-hero {
        padding: 75px 0 50px
    }

    .footer-grid {
        grid-template-columns: 1fr
    }

    .footer-grid>div:first-child {
        grid-column: auto
    }

    .score {
        font-size: .8rem
    }

    .score th:nth-child(3),
    .score td:nth-child(3) {
        display: none
    }

    .bar {
        width: 80px
    }
}
@media (min-width: 901px) {
    .nav-links {
        display: flex;
        align-items: center;
        gap: 22px;
    }
}