:root {
    --bg: #050805;
    --bg-soft: #08120b;
    --panel: #07160d;
    --panel-strong: #0b1f12;
    --ink: #9dfc91;
    --ink-bright: #d7ffbc;
    --muted: #58b86a;
    --line: #2f7e43;
    --line-bright: #77e37f;
    --amber: #ffd166;
    --cyan: #7be0ff;
    --error: #ff6b6b;
    --warning: #ffbf69;
    --success: #8cff98;
    --shadow: rgba(0, 0, 0, 0.48);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--bg);
}

body,
.challenge-screen {
    min-height: 100vh;
    margin: 0;
    background:
        repeating-linear-gradient(
            to bottom,
            rgba(124, 255, 141, 0.055) 0,
            rgba(124, 255, 141, 0.055) 1px,
            transparent 1px,
            transparent 4px
        ),
        radial-gradient(circle at top center, rgba(62, 142, 77, 0.12), transparent 36%),
        var(--bg);
    color: var(--ink);
    font-family: "Courier New", Courier, monospace;
    letter-spacing: 0;
}

body::before,
.challenge-screen::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.018),
        rgba(255, 255, 255, 0) 16%,
        rgba(255, 255, 255, 0.01) 52%,
        rgba(255, 255, 255, 0) 84%
    );
    mix-blend-mode: screen;
}

a {
    color: inherit;
}

.site-header,
.challenge-header {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    border-bottom: 2px solid var(--line);
    background: rgba(2, 8, 4, 0.94);
    box-shadow: 0 16px 36px var(--shadow);
    padding: 18px clamp(18px, 4vw, 48px);
}

.brand,
.nav-links a,
.challenge-back {
    color: var(--ink-bright);
    text-decoration: none;
}

.brand {
    font-weight: 700;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.nav-links a,
.challenge-back {
    border: 1px solid transparent;
    padding: 7px 10px;
}

.nav-links a:hover,
.challenge-back:hover {
    border-color: var(--line-bright);
    background: rgba(119, 227, 127, 0.08);
}

.shell,
.challenge-shell {
    position: relative;
    z-index: 1;
    width: min(1100px, calc(100% - 36px));
    margin: 0 auto;
    padding: clamp(24px, 5vw, 56px) 0;
}

.intro,
.dashboard-head,
.challenge-row,
.table-shell,
.challenge-panel {
    position: relative;
    border: 2px solid var(--line);
    border-radius: 4px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 22%),
        var(--panel);
    box-shadow:
        inset 0 0 0 1px rgba(157, 252, 145, 0.12),
        0 20px 48px var(--shadow);
}

.intro::before,
.dashboard-head::before,
.challenge-row::before,
.table-shell::before,
.challenge-panel::before {
    content: "::";
    position: absolute;
    top: 10px;
    right: 12px;
    color: var(--muted);
}

.intro {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    gap: 28px;
    align-items: end;
    padding: clamp(24px, 4vw, 42px);
}

.eyebrow,
.challenge-kicker {
    margin: 0 0 10px;
    color: var(--amber);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
}

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

h1 {
    margin-bottom: 14px;
    color: var(--ink-bright);
    font-size: clamp(2rem, 5vw, 3.45rem);
    line-height: 1.05;
    text-transform: uppercase;
}

h2 {
    margin-bottom: 0;
    color: var(--ink-bright);
    font-size: 1.3rem;
}

.lede {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.5;
}

.entry-form,
.flag-form,
.challenge-form {
    display: grid;
    gap: 10px;
}

label {
    color: var(--muted);
    font-weight: 700;
    text-transform: uppercase;
}

input,
button,
.action-link,
input[type="button"] {
    min-height: 46px;
    border-radius: 0;
    font: inherit;
}

input {
    border: 1px solid var(--line);
    background: #031006;
    color: var(--ink-bright);
    padding: 0 14px;
    outline: none;
}

input::placeholder {
    color: rgba(157, 252, 145, 0.56);
}

input:focus {
    border-color: var(--line-bright);
    box-shadow: 0 0 0 2px rgba(119, 227, 127, 0.18);
}

button,
.action-link,
input[type="button"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line-bright);
    background: #103619;
    color: var(--ink-bright);
    cursor: pointer;
    padding: 0 16px;
    text-decoration: none;
    text-transform: uppercase;
}

button:hover,
.action-link:hover,
input[type="button"]:hover {
    background: #195224;
}

button:disabled,
input:disabled {
    cursor: not-allowed;
    opacity: 0.58;
}

.quiet-button {
    border-color: var(--line);
    background: transparent;
}

.quiet-button:hover {
    border-color: var(--line-bright);
    background: rgba(119, 227, 127, 0.08);
}

.flash-stack {
    display: grid;
    gap: 10px;
    margin-bottom: 22px;
}

.flash {
    margin: 0;
    border: 1px solid currentColor;
    border-left-width: 5px;
    background: rgba(7, 22, 13, 0.96);
    padding: 12px 14px;
}

.flash-success {
    color: var(--success);
}

.flash-warning {
    color: var(--warning);
}

.flash-error {
    color: var(--error);
}

.dashboard-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 18px;
    align-items: center;
    margin-bottom: 22px;
    padding: 22px;
}

.dashboard-head h1,
.page-head h1 {
    margin-bottom: 0;
    font-size: 2.2rem;
}

.stat-line {
    display: flex;
    align-items: baseline;
    gap: 10px;
    color: var(--cyan);
    white-space: nowrap;
}

.stat-line strong {
    color: var(--ink-bright);
    font-size: 1.35rem;
}

.progress-block {
    display: grid;
    gap: 8px;
    min-width: min(100%, 320px);
}

.progress-track {
    height: 10px;
    overflow: hidden;
    border: 1px solid var(--line);
    background: #031006;
}

.progress-track span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--cyan), var(--success));
    transition: width 180ms ease;
}

.progress-copy,
.challenge-meta,
.inline-result {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.challenge-grid {
    display: grid;
    gap: 16px;
}

.challenge-row {
    display: grid;
    gap: 18px;
    padding: 20px;
}

.challenge-row.is-complete {
    border-color: var(--success);
}

.challenge-main,
.challenge-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.challenge-actions {
    align-items: stretch;
}

.status {
    min-width: 96px;
    border: 1px solid currentColor;
    padding: 10px 14px;
    font-weight: 700;
    text-align: center;
    text-transform: uppercase;
}

.is-open {
    color: var(--amber);
}

.is-solved {
    color: var(--success);
}

.flag-form {
    width: min(100%, 520px);
    grid-template-columns: minmax(220px, 1fr) auto;
}

.inline-result {
    min-height: 20px;
}

.inline-result.is-pending {
    color: var(--cyan);
}

.inline-result.is-solved {
    color: var(--success);
}

.inline-result.is-already_solved,
.inline-result.is-warning {
    color: var(--warning);
}

.inline-result.is-incorrect,
.inline-result.is-error {
    color: var(--error);
}

.page-head {
    margin-bottom: 18px;
}

.table-shell {
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    border-bottom: 1px solid var(--line);
    padding: 16px;
    text-align: left;
}

th {
    background: var(--panel-strong);
    color: var(--ink-bright);
    text-transform: uppercase;
}

tbody tr:hover td {
    background: rgba(119, 227, 127, 0.06);
}

tbody tr.is-current-player td {
    background: rgba(123, 224, 255, 0.1);
    color: var(--ink-bright);
}

tbody tr:last-child td {
    border-bottom: 0;
}

.you-marker {
    display: inline-flex;
    margin-left: 8px;
    border: 1px solid var(--cyan);
    color: var(--cyan);
    padding: 2px 6px;
    font-size: 0.75rem;
    text-transform: uppercase;
}

.challenge-panel {
    display: grid;
    gap: 18px;
    padding: clamp(22px, 4vw, 40px);
}

.challenge-panel p {
    max-width: 68ch;
    line-height: 1.55;
}

.challenge-panel form {
    display: grid;
    gap: 14px;
    max-width: 520px;
}

.challenge-panel label {
    display: grid;
    gap: 10px;
}

.challenge-panel #result {
    min-height: 28px;
    border: 1px solid var(--line);
    background: #031006;
    color: var(--amber);
    padding: 12px 14px;
}

.hidden-signal {
    color: #050805 !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

@media (max-width: 760px) {
    .site-header,
    .challenge-header,
    .challenge-main,
    .challenge-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .intro,
    .dashboard-head {
        grid-template-columns: 1fr;
    }

    .flag-form {
        width: 100%;
        grid-template-columns: 1fr;
    }

    .stat-line {
        flex-wrap: wrap;
        white-space: normal;
    }

    .table-shell {
        overflow-x: auto;
    }

    th,
    td {
        padding: 12px;
        white-space: nowrap;
    }
}