:root {
    color-scheme: dark;
    --bg: #0d0f14;
    --surface: #13161e;
    --surface-2: #171c28;
    --surface-3: #0f141f;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.13);
    --text: #f1f5f9;
    --soft: #cbd5e1;
    --muted: #64748b;
    --primary: #8b3cf7;
    --primary-2: #a855f7;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #fb7185;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
    font: inherit;
}

button {
    -webkit-tap-highlight-color: transparent;
}

.page {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 24px 0 48px;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--text);
    text-decoration: none;
}

.brand img {
    width: 42px;
    height: 42px;
    object-fit: contain;
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    font-size: 16px;
    line-height: 1.15;
}

.brand small,
.domain,
.eyebrow,
.lab-card p,
.locked-card p {
    color: var(--muted);
}

.brand small {
    margin-top: 2px;
    font-size: 11px;
    font-weight: 600;
}

.domain {
    font-size: 13px;
}

.lab-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin: -10px 0 18px;
}

.lab-nav a {
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface-3);
    color: var(--soft);
    text-decoration: none;
    font-size: 12px;
    font-weight: 800;
    padding: 9px 12px;
}

.lab-nav a.is-active {
    border-color: rgba(139, 60, 247, 0.5);
    background: rgba(139, 60, 247, 0.14);
    color: #f5f3ff;
}

.hero,
.locked-card,
.lab-sidebar,
.lab-panel,
.lab-page,
.brief-card {
    border: 1px solid var(--border);
    background: var(--surface);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 18px;
    align-items: stretch;
    border-radius: 18px;
    padding: 24px;
    margin-bottom: 16px;
}

.hero-copy {
    min-width: 0;
}

.eyebrow,
.level {
    margin: 0;
    color: #a78bfa;
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1 {
    margin: 10px 0 0;
    max-width: 760px;
    font-size: clamp(34px, 5.5vw, 54px);
    line-height: 1;
    letter-spacing: 0;
}

.hero p {
    max-width: 720px;
    margin: 14px 0 0;
    color: #94a3b8;
    font-size: 15px;
    line-height: 1.7;
}

.session-card {
    border: 1px solid rgba(34, 197, 94, 0.22);
    border-radius: 14px;
    background: rgba(34, 197, 94, 0.07);
    padding: 16px;
    display: grid;
    align-content: center;
    gap: 7px;
}

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

.lab-catalog {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 16px;
}

.catalog-card {
    min-height: 250px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
    color: var(--text);
    text-decoration: none;
    padding: 18px;
    display: grid;
    align-content: start;
    gap: 12px;
}

.catalog-card:hover,
.catalog-card:focus-visible {
    border-color: rgba(139, 60, 247, 0.45);
    outline: none;
}

.catalog-index {
    width: 44px;
    height: 44px;
    border: 1px solid rgba(167, 139, 250, 0.32);
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: #d8b4fe;
    background: rgba(139, 60, 247, 0.12);
    font-size: 13px;
    font-weight: 900;
}

.catalog-card strong {
    font-size: 21px;
    line-height: 1.2;
}

.catalog-card small {
    color: #94a3b8;
    font-size: 13px;
    line-height: 1.6;
}

.catalog-card b {
    width: fit-content;
    margin-top: auto;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
    padding: 10px 12px;
}

.coming-labs {
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--surface);
    padding: 18px;
    margin-bottom: 16px;
}

.section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 14px;
}

.section-head h2 {
    margin: 7px 0 0;
    color: var(--text);
    font-size: clamp(24px, 3vw, 34px);
    line-height: 1;
}

.section-head > span {
    border: 1px solid rgba(167, 139, 250, 0.28);
    border-radius: 999px;
    background: rgba(139, 60, 247, 0.1);
    color: #d8b4fe;
    padding: 8px 11px;
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    white-space: nowrap;
}

.dummy-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
}

.dummy-lab-card {
    min-height: 190px;
    border: 1px solid var(--border);
    border-radius: 15px;
    background: linear-gradient(180deg, rgba(28, 32, 48, 0.92), rgba(14, 19, 32, 0.92));
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.dummy-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.dummy-top .catalog-index {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    font-size: 12px;
}

.dummy-top b {
    border: 1px solid rgba(100, 116, 139, 0.26);
    border-radius: 999px;
    background: rgba(100, 116, 139, 0.12);
    color: #94a3b8;
    padding: 6px 8px;
    font-size: 9px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.dummy-lab-card small {
    color: #a78bfa;
    font-size: 10px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.dummy-lab-card strong {
    color: var(--text);
    font-size: 16px;
    line-height: 1.2;
}

.dummy-lab-card p {
    margin: 0;
    color: #94a3b8;
    font-size: 12px;
    line-height: 1.55;
}

.brief-card {
    border-radius: 16px;
    padding: 18px;
}

.brief-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 12px;
}

.brief-grid div {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-3);
    padding: 14px;
}

.brief-grid strong,
.brief-grid span {
    display: block;
}

.brief-grid strong {
    color: var(--text);
    font-size: 13px;
}

.brief-grid span {
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.6;
}

.session-card strong {
    color: #bbf7d0;
    font-size: 14px;
}

.session-card small {
    color: #86efac;
    font-size: 12px;
    line-height: 1.5;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--success);
    box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.12);
}

.workspace {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

.lab-sidebar {
    border-radius: 18px;
    padding: 14px;
    position: sticky;
    top: 16px;
    display: grid;
    gap: 10px;
}

.sidebar-head {
    padding: 4px 4px 8px;
}

.sidebar-head strong {
    display: block;
    margin-top: 6px;
    font-size: 18px;
}

.safety-card {
    margin-top: 4px;
    border: 1px solid rgba(245, 158, 11, 0.23);
    border-radius: 12px;
    background: rgba(245, 158, 11, 0.08);
    padding: 12px;
}

.safety-card strong,
.safety-card span {
    display: block;
}

.safety-card strong {
    color: #fde68a;
    font-size: 13px;
}

.safety-card span {
    margin-top: 6px;
    color: #fcd34d;
    font-size: 12px;
    line-height: 1.55;
}

.lab-stage {
    min-width: 0;
}

.lab-page {
    border-radius: 18px;
    padding: 22px;
    display: grid;
    gap: 18px;
}

.lab-hero h1 {
    margin: 8px 0 0;
    font-size: clamp(34px, 5.4vw, 58px);
    line-height: 1;
    letter-spacing: 0;
}

.lab-hero p {
    max-width: 760px;
    margin: 12px 0 0;
    color: #94a3b8;
    font-size: 15px;
    line-height: 1.7;
}

.lab-panel {
    display: none;
    border-radius: 18px;
    padding: 22px;
}

.lab-panel.is-active {
    display: grid;
    gap: 18px;
}

.panel-head h2 {
    margin: 8px 0 0;
    font-size: clamp(26px, 4vw, 38px);
    line-height: 1.05;
    letter-spacing: 0;
}

.panel-head p {
    margin: 10px 0 0;
    color: #94a3b8;
    font-size: 14px;
    line-height: 1.7;
    max-width: 780px;
}

.section-grid,
.concept-grid {
    display: grid;
    gap: 10px;
}

.section-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.concept-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.info-card,
.concept-grid div,
.result-card,
.preview-card,
.header-output-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-3);
}

.info-card {
    padding: 14px;
}

.info-card span,
.result-card > span,
.preview-card > span,
.header-output-card > span {
    display: block;
    color: #a78bfa;
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.info-card strong {
    display: block;
    margin-top: 7px;
    color: var(--soft);
    font-size: 13px;
    line-height: 1.45;
}

.concept-grid div {
    padding: 14px;
}

.concept-grid strong,
.concept-grid span {
    display: block;
}

.concept-grid strong {
    color: #f1f5f9;
    font-size: 13px;
}

.concept-grid span {
    margin-top: 7px;
    color: #94a3b8;
    font-size: 12px;
    line-height: 1.55;
}

.practice-grid,
.header-workbench {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 12px;
    align-items: stretch;
}

.lab-box {
    display: grid;
    gap: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-3);
    padding: 14px;
}

.box-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

label {
    color: var(--soft);
    font-size: 12px;
    font-weight: 800;
}

.input-row {
    display: flex;
    gap: 8px;
}

input,
textarea {
    width: 100%;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    background: var(--surface-2);
    color: var(--text);
    outline: none;
    padding: 12px;
}

input {
    min-height: 44px;
}

textarea {
    min-height: 150px;
    resize: vertical;
}

button,
.locked-card a {
    border: 0;
    border-radius: 10px;
    background: var(--primary);
    color: white;
    font-weight: 800;
    min-height: 44px;
    padding: 0 14px;
    cursor: pointer;
    text-decoration: none;
}

.ghost-btn {
    min-height: 34px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--soft);
    font-size: 12px;
}

.result-card,
.preview-card,
.header-output-card {
    padding: 14px;
    min-width: 0;
}

pre {
    min-height: 248px;
    overflow: auto;
    margin: 10px 0 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #090d16;
    color: #dbeafe;
    padding: 12px;
    font-size: 12px;
    line-height: 1.6;
}

iframe {
    width: 100%;
    height: 160px;
    margin-top: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: white;
}

.header-list {
    display: grid;
    gap: 8px;
}

.header-list button {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--soft);
    text-align: left;
    justify-content: flex-start;
}

.header-list button.is-active {
    border-color: rgba(139, 60, 247, 0.5);
    color: #f5f3ff;
    background: rgba(139, 60, 247, 0.14);
}

.explain {
    margin: 10px 0 0;
    min-height: 74px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #0b1220;
    padding: 12px;
    color: #cbd5e1;
    font-size: 13px;
    line-height: 1.65;
}

.defense-panel {
    border: 1px solid rgba(34, 197, 94, 0.24);
    border-radius: 12px;
    background: rgba(34, 197, 94, 0.07);
    padding: 14px;
}

.defense-panel strong,
.defense-panel span {
    display: block;
}

.defense-panel strong {
    color: #86efac;
    font-size: 13px;
}

.defense-panel span {
    margin-top: 7px;
    color: #bbf7d0;
    font-size: 12px;
    line-height: 1.6;
}

code {
    color: #e9d5ff;
    background: #202637;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2px 5px;
}

.locked-card {
    max-width: 560px;
    margin: 70px auto 0;
    padding: 34px;
    border-radius: 18px;
    text-align: center;
}

.lock-icon {
    width: 54px;
    height: 54px;
    display: grid;
    place-items: center;
    border-radius: 18px;
    margin: 0 auto 14px;
    background: rgba(139, 60, 247, 0.16);
    color: #c4b5fd;
    border: 1px solid rgba(167, 139, 250, 0.26);
    font-weight: 900;
}

.locked-card h1 {
    max-width: none;
    font-size: 34px;
    letter-spacing: 0;
}

.locked-card a {
    display: inline-flex;
    align-items: center;
    margin-top: 18px;
}

.reason-box {
    margin: 16px auto 0;
    max-width: 420px;
    border: 1px solid rgba(251, 191, 36, 0.28);
    border-radius: 12px;
    background: rgba(251, 191, 36, 0.08);
    color: #fcd34d;
    padding: 12px;
    font-size: 13px;
    font-weight: 800;
    line-height: 1.5;
}

@media (max-width: 980px) {
    .workspace {
        grid-template-columns: minmax(0, 1fr);
    }

    .lab-sidebar {
        position: static;
    }

    .section-grid,
    .concept-grid,
    .practice-grid,
    .header-workbench,
    .lab-catalog,
    .dummy-grid,
    .brief-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 680px) {
    .page {
        width: min(100% - 24px, 1180px);
        padding-top: 20px;
    }

    .header {
        align-items: flex-start;
        flex-direction: column;
        margin-bottom: 24px;
    }

    .hero {
        grid-template-columns: minmax(0, 1fr);
        padding: 20px;
    }

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

    .lab-panel,
    .lab-page,
    .lab-sidebar,
    .brief-card,
    .locked-card {
        padding: 16px;
    }

    .input-row {
        flex-direction: column;
    }

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

    h1 {
        font-size: 34px;
    }
}