.fi-page {
    --fi-green: #b9ff72;
    --fi-cyan: #70e7ff;
    --fi-gold: #ffd66b;
    --fi-violet: #c29bff;
    --fi-red: #ff8ca0;
    color: var(--paper);
    background:
        radial-gradient(circle at 8% 24%, rgba(112, 231, 255, 0.07), transparent 28rem),
        radial-gradient(circle at 92% 54%, rgba(185, 255, 114, 0.06), transparent 30rem),
        #080b10;
}

.fi-progress {
    position: fixed;
    inset: 0 auto auto 0;
    z-index: 80;
    width: var(--lesson-progress, 0%);
    height: 3px;
    background: linear-gradient(90deg, var(--fi-cyan), var(--fi-green));
    box-shadow: 0 0 18px rgba(112, 231, 255, 0.7);
}

.fi-hero {
    position: relative;
    min-height: 91vh;
    display: grid;
    align-items: center;
    overflow: hidden;
    isolation: isolate;
    padding: 9.5rem max(1.25rem, calc((100vw - var(--max)) / 2)) 6.5rem;
    background: #07101e;
}

.fi-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -2;
    background:
        linear-gradient(90deg, rgba(3, 10, 22, 0.98) 0%, rgba(3, 10, 22, 0.92) 32%, rgba(3, 10, 22, 0.28) 66%, rgba(3, 10, 22, 0.12)),
        linear-gradient(0deg, rgba(8, 11, 16, 0.97), transparent 42%),
        url("../../pics/minecraft-094-fabric-java-intro-hero.png") center / cover no-repeat;
}

.fi-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.16;
    background-image: linear-gradient(rgba(255,255,255,.14) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.14) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: linear-gradient(90deg, #000, transparent 58%);
}

.fi-hero-content {
    max-width: 660px;
}

.fi-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 1rem;
    color: rgba(247, 244, 236, 0.68);
    font-size: 0.86rem;
}

.fi-breadcrumb a:hover {
    color: var(--fi-green);
}

.fi-hero h1 {
    max-width: 10ch;
    margin: 0;
    font-size: clamp(3.1rem, 7vw, 6.8rem);
    line-height: 0.94;
    letter-spacing: -0.04em;
    text-wrap: balance;
}

.fi-hero h1 span {
    color: var(--fi-green);
}

.fi-hero-copy {
    max-width: 43rem;
    margin: 1.4rem 0 0;
    color: rgba(247, 244, 236, 0.86);
    font-size: clamp(1.02rem, 1.8vw, 1.2rem);
}

.fi-badges,
.fi-actions,
.fi-tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.fi-badges {
    margin-top: 1.45rem;
}

.fi-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 2.2rem;
    padding: 0.42rem 0.7rem;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    color: rgba(247, 244, 236, 0.88);
    background: rgba(6, 15, 28, 0.58);
    backdrop-filter: blur(10px);
    font-size: 0.86rem;
    font-weight: 700;
}

.fi-badge svg {
    width: 1rem;
    height: 1rem;
    color: var(--fi-cyan);
}

.fi-actions {
    margin-top: 1.8rem;
}

.fi-primary,
.fi-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 3rem;
    padding: 0.78rem 1rem;
    border: 1px solid transparent;
    border-radius: 6px;
    font-weight: 850;
    transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.fi-primary {
    color: #09110a;
    border-color: var(--fi-green);
    background: var(--fi-green);
}

.fi-secondary {
    border-color: rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.07);
}

.fi-primary:hover,
.fi-secondary:hover {
    transform: translateY(-2px);
}

.fi-primary svg,
.fi-secondary svg {
    width: 1.05rem;
    height: 1.05rem;
}

.fi-course-shell {
    display: grid;
    grid-template-columns: 240px minmax(0, 860px);
    justify-content: center;
    gap: clamp(2rem, 5vw, 5rem);
    width: min(calc(100% - 2.5rem), 1180px);
    margin: 0 auto;
    padding: 4.5rem 0 7rem;
}

.fi-toc {
    align-self: start;
    position: sticky;
    top: 7rem;
    padding: 1.1rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    background: rgba(16, 23, 33, 0.76);
    backdrop-filter: blur(14px);
}

.fi-toc strong {
    display: block;
    margin-bottom: 0.65rem;
    color: var(--fi-green);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.fi-toc a {
    display: block;
    padding: 0.42rem 0.5rem;
    color: rgba(247, 244, 236, 0.67);
    border-left: 2px solid transparent;
    font-size: 0.9rem;
}

.fi-toc a:hover,
.fi-toc a.is-active {
    color: var(--paper);
    border-left-color: var(--fi-cyan);
    background: rgba(112, 231, 255, 0.06);
}

.fi-lesson {
    min-width: 0;
}

.fi-section {
    scroll-margin-top: 7rem;
    padding: 0 0 4.4rem;
    margin-bottom: 4.4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.fi-section:last-child {
    border-bottom: 0;
}

.fi-kicker {
    margin: 0 0 0.7rem;
    color: var(--fi-green);
    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.fi-section h2 {
    max-width: 18ch;
    margin: 0;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    line-height: 1.03;
    letter-spacing: -0.025em;
    text-wrap: balance;
}

.fi-section h3 {
    margin: 2rem 0 0.65rem;
    font-size: 1.35rem;
    line-height: 1.28;
}

.fi-section p,
.fi-section li {
    color: rgba(247, 244, 236, 0.79);
}

.fi-section p {
    margin: 1rem 0 0;
}

.fi-lead {
    max-width: 48rem;
    font-size: 1.12rem;
    line-height: 1.78;
}

.fi-card-grid,
.fi-concept-grid,
.fi-check-grid,
.fi-practice-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.fi-card-grid,
.fi-concept-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.fi-card,
.fi-concept,
.fi-check,
.fi-practice {
    padding: 1.25rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.025));
}

.fi-card-number {
    color: var(--fi-gold);
    font-size: 0.86rem;
    font-weight: 900;
}

.fi-card h3,
.fi-concept h3,
.fi-check h3,
.fi-practice h3 {
    margin: 0.45rem 0 0.45rem;
    font-size: 1.12rem;
}

.fi-card p,
.fi-concept p,
.fi-check p,
.fi-practice p {
    margin: 0;
    font-size: 0.94rem;
}

.fi-figure {
    overflow: hidden;
    margin: 1.7rem 0 0;
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 12px;
    background: #0b121d;
}

.fi-figure img {
    display: block;
    width: 100%;
}

.fi-shot {
    border-color: rgba(112, 231, 255, 0.24);
    background: #11161d;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.24);
}

.fi-step .fi-shot {
    margin-top: 1.1rem;
}

.fi-shot img {
    height: auto;
    background: #202328;
}

.fi-shot figcaption strong {
    color: var(--fi-cyan);
}

.fi-figure figcaption {
    padding: 0.85rem 1rem;
    color: rgba(247, 244, 236, 0.61);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}

.fi-note {
    margin-top: 1.35rem;
    padding: 1rem 1.1rem;
    border-left: 4px solid var(--fi-cyan);
    border-radius: 0 8px 8px 0;
    background: rgba(112, 231, 255, 0.08);
}

.fi-note strong {
    color: var(--fi-cyan);
}

.fi-note.is-warning {
    border-left-color: var(--fi-gold);
    background: rgba(255, 214, 107, 0.08);
}

.fi-note.is-warning strong {
    color: var(--fi-gold);
}

.fi-note.is-success {
    border-left-color: var(--fi-green);
    background: rgba(185, 255, 114, 0.08);
}

.fi-note.is-success strong {
    color: var(--fi-green);
}

.fi-table-wrap {
    overflow-x: auto;
    margin-top: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
}

.fi-table {
    width: 100%;
    min-width: 660px;
    border-collapse: collapse;
}

.fi-table th,
.fi-table td {
    padding: 0.9rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.fi-table th {
    color: var(--fi-green);
    background: rgba(255, 255, 255, 0.05);
    font-size: 0.85rem;
}

.fi-table td {
    color: rgba(247, 244, 236, 0.76);
}

.fi-table tr:last-child td {
    border-bottom: 0;
}

.fi-steps {
    display: grid;
    gap: 1.1rem;
    margin-top: 1.5rem;
}

.fi-step {
    position: relative;
    padding: 1.35rem 1.35rem 1.35rem 4.6rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.035);
}

.fi-step-index {
    position: absolute;
    left: 1.15rem;
    top: 1.25rem;
    display: grid;
    place-items: center;
    width: 2.4rem;
    height: 2.4rem;
    color: #07110a;
    border-radius: 8px;
    background: var(--fi-green);
    font-weight: 950;
}

.fi-step h3 {
    margin: 0;
}

.fi-step p {
    margin-top: 0.55rem;
}

.fi-step ul,
.fi-section > ul,
.fi-section > ol {
    padding-left: 1.3rem;
}

.fi-step li + li,
.fi-section li + li {
    margin-top: 0.42rem;
}

.fi-inline-code,
.fi-section :not(pre) > code {
    padding: 0.14rem 0.36rem;
    color: #c7f7ff;
    border: 1px solid rgba(112, 231, 255, 0.16);
    border-radius: 4px;
    background: rgba(112, 231, 255, 0.08);
    font-family: Consolas, "Cascadia Code", monospace;
    font-size: 0.9em;
}

.fi-code {
    overflow: hidden;
    margin-top: 1.35rem;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 10px;
    background: #0a0f16;
}

.fi-code-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.7rem 0.85rem;
    color: rgba(247, 244, 236, 0.64);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: #141b25;
    font-family: Consolas, "Cascadia Code", monospace;
    font-size: 0.82rem;
}

.fi-copy {
    flex: 0 0 auto;
    padding: 0.28rem 0.62rem;
    color: var(--paper);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
    cursor: pointer;
}

.fi-copy:hover {
    border-color: var(--fi-cyan);
}

.fi-code pre {
    overflow: auto;
    margin: 0;
    padding: 1.15rem;
    border: 0;
    background: transparent;
    font-size: 0.88rem;
    line-height: 1.65;
    tab-size: 4;
}

.fi-code code {
    color: #d9e2ef;
    font-family: Consolas, "Cascadia Code", monospace;
}

.fi-file-tree {
    color: #cfdae8;
    white-space: pre;
}

.fi-term {
    color: var(--fi-green);
}

.fi-term::before {
    content: "> ";
    color: var(--fi-cyan);
}

.fi-details {
    margin-top: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.035);
}

.fi-details summary {
    padding: 0.9rem 1rem;
    color: var(--paper);
    cursor: pointer;
    font-weight: 800;
}

.fi-details > div {
    padding: 0 1rem 1rem;
}

.fi-details p {
    margin-top: 0.45rem;
}

.fi-download {
    margin-top: 1.6rem;
    padding: 1.4rem;
    border: 1px solid rgba(185, 255, 114, 0.35);
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(185, 255, 114, 0.12), rgba(112, 231, 255, 0.07));
}

.fi-download h3 {
    margin: 0;
}

.fi-download p {
    max-width: 44rem;
    margin: 0.55rem 0 0;
}

.fi-download .fi-actions {
    margin-top: 1rem;
}

.fi-source-list a {
    color: var(--fi-cyan);
    text-decoration: underline;
    text-decoration-color: rgba(112, 231, 255, 0.35);
    text-underline-offset: 0.2em;
}

.fi-finish {
    padding: 2rem;
    border: 1px solid rgba(185, 255, 114, 0.32);
    border-radius: 14px;
    background:
        radial-gradient(circle at 85% 15%, rgba(112, 231, 255, 0.14), transparent 18rem),
        linear-gradient(135deg, rgba(185, 255, 114, 0.12), rgba(255, 255, 255, 0.03));
}

.fi-finish h2 {
    max-width: 16ch;
}

@media (max-width: 980px) {
    .fi-course-shell {
        grid-template-columns: 1fr;
    }

    .fi-toc {
        position: static;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .fi-toc strong {
        grid-column: 1 / -1;
    }

    .fi-check-grid,
    .fi-practice-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 700px) {
    .fi-hero {
        min-height: 94vh;
        align-items: end;
        padding-top: 8rem;
    }

    .fi-hero::before {
        background:
            linear-gradient(0deg, rgba(3, 10, 22, 0.99) 0%, rgba(3, 10, 22, 0.9) 48%, rgba(3, 10, 22, 0.2) 85%),
            url("../../pics/minecraft-094-fabric-java-intro-hero.png") 68% center / cover no-repeat;
    }

    .fi-hero::after {
        display: none;
    }

    .fi-hero h1 {
        font-size: clamp(2.75rem, 14vw, 4.4rem);
    }

    .fi-course-shell {
        width: min(calc(100% - 2rem), 860px);
        padding-top: 2.5rem;
    }

    .fi-toc,
    .fi-card-grid,
    .fi-concept-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .fi-section {
        margin-bottom: 3rem;
        padding-bottom: 3rem;
    }

    .fi-step {
        padding: 4.4rem 1.05rem 1.1rem;
    }

    .fi-code-head {
        align-items: stretch;
        flex-direction: column;
    }

    .fi-code-head span {
        overflow-wrap: anywhere;
    }

    .fi-copy {
        align-self: flex-start;
    }
}

@media print {
    .site-header,
    .fi-progress,
    .fi-toc,
    .fi-actions,
    .fi-copy {
        display: none !important;
    }

    .fi-page,
    .fi-code,
    .fi-card,
    .fi-concept,
    .fi-step {
        color: #111;
        background: #fff;
    }

    .fi-course-shell {
        display: block;
        width: 100%;
    }

    .fi-section p,
    .fi-section li,
    .fi-code code {
        color: #222;
    }
}