[hidden] {
    display: none !important
}

:root {
    --ink: #0D1321;
    --ink-2: #0A0F1A;
    --panel: #151D2C;
    --panel-2: #1C2638;
    --line: #27324A;
    --line-soft: #1E2840;
    --gold: #E6B450;
    --gold-dim: #A9863C;
    --gold-soft: #F0D9A0;
    --emerald: #3DD68C;
    --emerald-dim: #1f6b48;
    --coral: #F2785C;
    --coral-dim: #8a3f2e;
    --text: #EAEFF7;
    --muted: #8A97AC;
    --muted-2: #5E6B81;
    --body: #C9D3E2;
    --radius: 14px;
    --shadow: 0 14px 40px -22px rgba(0, 0, 0, .85);
}

* {
    box-sizing: border-box
}

html,
body {
    margin: 0
}

body {
    background:
        radial-gradient(1200px 600px at 85% -8%, rgba(230, 180, 80, .10), transparent 60%),
        radial-gradient(900px 500px at -5% 110%, rgba(61, 214, 140, .07), transparent 55%),
        var(--ink);
    color: var(--text);
    font-family: "Inter", system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
    padding: clamp(20px, 4vw, 56px) clamp(16px, 4vw, 40px) 80px;
}

.wrap {
    max-width: 900px;
    margin: 0 auto
}

/* Header */
.head {
    position: relative;
    margin-bottom: 30px;
    overflow: hidden
}

.curve {
    position: absolute;
    right: -12px;
    top: -10px;
    width: min(360px, 50%);
    height: 140px;
    opacity: .5;
    pointer-events: none
}

.eyebrow {
    font-family: "JetBrains Mono", monospace;
    font-size: 11.5px;
    letter-spacing: .26em;
    text-transform: uppercase;
    color: var(--gold);
    margin: 0 0 14px;
    font-weight: 500
}

.eyebrow b {
    color: var(--muted);
    font-weight: 400
}

h1 {
    font-family: "Space Grotesk", sans-serif;
    font-weight: 700;
    font-size: clamp(32px, 6.5vw, 54px);
    line-height: 1.02;
    letter-spacing: -.02em;
    margin: 0 0 12px
}

h1 .br {
    color: var(--gold)
}

.lead {
    font-size: clamp(15px, 2.3vw, 17px);
    color: var(--muted);
    max-width: 56ch;
    margin: 0
}

/* Dashboard */
.dash {
    margin-top: 24px;
    background: linear-gradient(180deg, var(--panel), var(--ink-2));
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px 20px;
    box-shadow: var(--shadow)
}

.dash-top {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    flex-wrap: wrap
}

.pct {
    font-family: "Space Grotesk", sans-serif;
    font-weight: 700;
    font-size: 30px;
    letter-spacing: -.02em
}

.pct small {
    font-size: 15px;
    color: var(--muted);
    font-weight: 500;
    margin-left: 4px
}

.counts {
    font-family: "JetBrains Mono", monospace;
    font-size: 12.5px;
    color: var(--muted);
    text-align: right;
    line-height: 1.7
}

.counts b {
    color: var(--text);
    font-weight: 700
}

.bar {
    position: relative;
    height: 9px;
    border-radius: 999px;
    background: var(--line-soft);
    margin-top: 14px;
    overflow: hidden
}

.bar-fill {
    position: absolute;
    inset: 0 auto 0 0;
    width: 0;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--gold), var(--emerald));
    transition: width .55s cubic-bezier(.22, 1, .36, 1)
}

.bar-ghost {
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(90deg, transparent 0, transparent 10.5%, rgba(255, 255, 255, .05) 10.5%, rgba(255, 255, 255, .05) 11.111%)
}

.toolbar {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin: 14px 2px 0;
    flex-wrap: wrap
}

.tbtn {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    letter-spacing: .04em;
    color: var(--muted);
    background: transparent;
    border: 1px solid var(--line);
    padding: 7px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: .18s
}

.tbtn:hover {
    color: var(--text);
    border-color: var(--gold-dim);
    background: var(--panel)
}

.tbtn.danger:hover {
    color: var(--coral);
    border-color: var(--coral)
}

.tbtn.accent {
    color: #8FB8FF;
    border-color: rgba(143, 184, 255, .35);
    background: rgba(143, 184, 255, .08)
}

.tbtn.accent:hover {
    color: #bcd3ff;
    border-color: rgba(143, 184, 255, .6);
    background: rgba(143, 184, 255, .16)
}

.tbtn.accent.ok {
    color: var(--emerald);
    border-color: var(--emerald-dim);
    background: rgba(61, 214, 140, .12)
}

.tbtn.ok {
    color: var(--emerald);
    border-color: var(--emerald-dim);
    background: rgba(61, 214, 140, .12)
}

.tbtn.err {
    color: var(--coral);
    border-color: var(--coral);
    background: rgba(242, 120, 92, .1)
}

.legend {
    margin: 12px 2px 0;
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    color: var(--muted-2);
    letter-spacing: .02em;
    line-height: 1.9
}

.lg {
    padding: 2px 7px;
    border-radius: 999px;
    border: 1px solid var(--line);
    margin: 0 2px
}

.lg.f {
    color: var(--emerald);
    border-color: var(--emerald-dim)
}

.lg.m {
    color: var(--gold);
    border-color: var(--gold-dim)
}

.lg.d {
    color: var(--coral);
    border-color: var(--coral-dim)
}

/* Roadmap */
.road {
    margin-top: 26px;
    display: flex;
    flex-direction: column
}

.stage {
    display: grid;
    grid-template-columns: 46px 1fr;
    gap: 14px
}

.rail {
    display: flex;
    flex-direction: column;
    align-items: center
}

.seg {
    width: 2px;
    flex: 1 0 14px;
    background: var(--line);
    transition: background .4s
}

.stage:first-child .seg.top {
    background: transparent
}

.stage:last-child .seg.bot {
    background: transparent
}

.node {
    flex: 0 0 auto;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-family: "Space Grotesk", sans-serif;
    font-weight: 700;
    font-size: 15px;
    background: var(--panel);
    border: 2px solid var(--line);
    color: var(--muted);
    transition: .35s
}

.node .chk {
    display: none
}

.stage.done .seg {
    background: var(--emerald-dim)
}

.stage.done .node {
    background: var(--emerald);
    border-color: var(--emerald);
    color: #06281a
}

.stage.done .node .num {
    display: none
}

.stage.done .node .chk {
    display: block;
    width: 18px;
    height: 18px
}

.stage.active .node {
    border-color: var(--gold);
    color: var(--gold);
    background: #1a1606;
    box-shadow: 0 0 0 4px rgba(230, 180, 80, .14)
}

.stage.active .seg.top {
    background: var(--gold-dim)
}

.stage.soon .node {
    opacity: .5
}

.card {
    background: linear-gradient(180deg, var(--panel), var(--ink-2));
    border: 1px solid var(--line);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: border-color .25s
}

.card:hover {
    border-color: #33405c
}

.stage.active .card {
    border-color: rgba(230, 180, 80, .35)
}

.stage.soon .card {
    opacity: .62
}

.chead {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 18px;
    cursor: pointer;
    user-select: none;
    width: 100%;
    text-align: left;
    background: none;
    border: 0;
    color: inherit;
    font: inherit
}

.chead:focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: -3px;
    border-radius: var(--radius)
}

.cmain {
    flex: 1;
    min-width: 0
}

.ceyebrow {
    font-family: "JetBrains Mono", monospace;
    font-size: 10.5px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--muted-2);
    margin-bottom: 7px;
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap
}

.pill {
    padding: 2px 8px;
    border-radius: 999px;
    border: 1px solid var(--line);
    font-size: 9.5px;
    letter-spacing: .1em
}

.pill.lvl {
    color: var(--gold);
    border-color: rgba(230, 180, 80, .3)
}

.pill.time {
    color: var(--muted)
}

.pill.soon {
    color: var(--coral);
    border-color: var(--coral-dim)
}

.ctitle {
    font-family: "Space Grotesk", sans-serif;
    font-weight: 600;
    font-size: 20px;
    letter-spacing: -.01em;
    margin: 0 0 2px;
    line-height: 1.15
}

.csub {
    font-size: 13.5px;
    color: var(--muted);
    margin: 0
}

.cside {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    padding-top: 2px
}

.frac {
    font-family: "JetBrains Mono", monospace;
    font-size: 13px;
    color: var(--muted);
    white-space: nowrap
}

.frac b {
    color: var(--emerald);
    font-weight: 700
}

.chev {
    width: 18px;
    height: 18px;
    color: var(--muted);
    transition: transform .3s
}

.stage.collapsed .chev {
    transform: rotate(-90deg)
}

.cbody {
    display: grid;
    grid-template-rows: 1fr;
    transition: grid-template-rows .32s ease
}

.stage.collapsed .cbody {
    grid-template-rows: 0fr
}

.cbody-inner {
    overflow: hidden
}

.formula {
    margin: 0 18px 4px;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 11px 14px;
    background: var(--ink-2);
    border: 1px solid var(--line-soft);
    border-left: 3px solid var(--gold);
    border-radius: 9px
}

.flabel {
    font-family: "JetBrains Mono", monospace;
    font-size: 9px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--muted-2);
    white-space: nowrap
}

.formula code {
    font-family: "JetBrains Mono", monospace;
    font-size: 14px;
    color: var(--text);
    font-weight: 500;
    overflow-x: auto;
    white-space: nowrap
}

.soon-msg {
    margin: 8px 18px 16px;
    font-size: 13px;
    color: var(--muted-2);
    font-family: "JetBrains Mono", monospace
}

/* Topics */
.topics {
    list-style: none;
    margin: 14px 0 6px;
    padding: 0
}

.topic-item {
    border-top: 1px solid var(--line-soft)
}

.topic-item:first-child {
    border-top: 0
}

.t-expand {
    width: 100%;
    display: flex;
    align-items: flex-start;
    gap: 13px;
    justify-content: space-between;
    background: none;
    border: 0;
    color: inherit;
    font: inherit;
    text-align: left;
    cursor: pointer;
    padding: 12px 18px;
    transition: background .15s
}

.t-expand:hover {
    background: var(--panel-2)
}

.t-expand:focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: -3px
}

.tbody {
    min-width: 0
}

.tnum {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    color: var(--gold);
    margin-right: 8px
}

.tname {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    display: inline
}

.tdesc {
    font-size: 12.5px;
    color: var(--muted-2);
    display: block;
    margin-top: 2px
}

.t-right {
    display: flex;
    align-items: center;
    gap: 11px;
    flex-shrink: 0;
    padding-top: 1px
}

.prog-chip {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    color: var(--muted);
    white-space: nowrap;
    padding: 2px 8px;
    border: 1px solid var(--line);
    border-radius: 999px
}

.prog-chip b {
    color: var(--gold)
}

.prog-chip.full {
    color: var(--emerald);
    border-color: var(--emerald-dim)
}

.prog-chip.full b {
    color: var(--emerald)
}

.tchev {
    width: 16px;
    height: 16px;
    color: var(--muted-2);
    transition: transform .25s
}

.topic-item.open .tchev {
    transform: rotate(180deg);
    color: var(--gold)
}

.detail {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows .3s ease
}

.topic-item.open .detail {
    grid-template-rows: 1fr
}

.detail-inner {
    overflow: hidden
}

.detail-pad {
    padding: 6px 22px 22px 49px
}

code.inl {
    font-family: "JetBrains Mono", monospace;
    font-size: .85em;
    background: rgba(230, 180, 80, .10);
    color: var(--gold-soft);
    padding: 1.5px 5px;
    border-radius: 5px;
    white-space: nowrap
}

.dsec {
    margin-top: 18px
}

.dsec:first-child {
    margin-top: 6px
}

.dlabel {
    font-family: "JetBrains Mono", monospace;
    font-size: 10px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 9px;
    display: flex;
    align-items: center;
    gap: 8px
}

.dlabel::before {
    content: "";
    width: 14px;
    height: 1.5px;
    background: var(--gold);
    opacity: .6
}

.dlabel.ex {
    color: var(--emerald)
}

.dlabel.ex::before {
    background: var(--emerald)
}

.dlabel.qz {
    color: var(--coral)
}

.dlabel.qz::before {
    background: var(--coral)
}

.dlabel.pr {
    color: #8FB8FF
}

.dlabel.pr::before {
    background: #8FB8FF
}

.dtext {
    font-size: 14px;
    color: var(--body);
    line-height: 1.65;
    max-width: 64ch;
    margin: 0 0 10px
}

.dtext:last-child {
    margin-bottom: 0
}

.dtext b {
    color: var(--text);
    font-weight: 600
}

/* Prompt box */
.prompt-box {
    border: 1px solid var(--line);
    border-radius: 11px;
    background: var(--ink-2);
    overflow: hidden;
    max-width: 64ch
}

.prompt-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 11px 13px;
    flex-wrap: wrap
}

.prompt-hint {
    font-size: 12.5px;
    color: var(--muted)
}

.prompt-actions {
    display: flex;
    gap: 7px
}

.pbtn {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    letter-spacing: .03em;
    padding: 6px 11px;
    border-radius: 8px;
    cursor: pointer;
    transition: .16s;
    border: 1px solid var(--line);
    background: transparent
}

.pbtn.ghost {
    color: var(--muted)
}

.pbtn.ghost:hover {
    color: var(--text);
    border-color: var(--muted-2)
}

.pbtn.copy {
    color: #8FB8FF;
    border-color: rgba(143, 184, 255, .35);
    background: rgba(143, 184, 255, .08)
}

.pbtn.copy:hover {
    background: rgba(143, 184, 255, .16)
}

.pbtn.copy.ok {
    color: var(--emerald);
    border-color: var(--emerald-dim);
    background: rgba(61, 214, 140, .12)
}

.prompt-body {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows .28s ease
}

.prompt-box.open .prompt-body {
    grid-template-rows: 1fr
}

.prompt-body>div {
    overflow: hidden
}

.prompt-text {
    margin: 0;
    padding: 0 14px 14px;
    font-size: 13px;
    color: var(--body);
    line-height: 1.6;
    border-top: 1px dashed var(--line);
    padding-top: 12px
}

/* Worked examples */
.we-item {
    background: var(--ink-2);
    border: 1px solid var(--line-soft);
    border-left: 3px solid var(--emerald);
    border-radius: 9px;
    padding: 12px 14px;
    margin-bottom: 10px;
    max-width: 64ch
}

.we-item:last-child {
    margin-bottom: 0
}

.exq {
    font-size: 13.5px;
    color: var(--text);
    line-height: 1.55
}

.we-sol {
    margin-top: 9px;
    font-size: 13px;
    color: #A9D9C2;
    line-height: 1.72
}

.we-sol .lab {
    color: var(--emerald);
    font-weight: 600
}

.dbadge {
    display: inline-block;
    font-family: "JetBrains Mono", monospace;
    font-size: 9.5px;
    letter-spacing: .06em;
    padding: 2px 7px;
    border-radius: 999px;
    margin-bottom: 8px
}

.dbadge.f {
    color: var(--emerald);
    border: 1px solid var(--emerald-dim)
}

.dbadge.m {
    color: var(--gold);
    border: 1px solid var(--gold-dim)
}

.dbadge.d {
    color: var(--coral);
    border: 1px solid var(--coral-dim)
}

/* Exercises */
.exlist {
    display: flex;
    flex-direction: column;
    gap: 10px
}

.ex-item {
    display: flex;
    gap: 12px;
    background: var(--ink-2);
    border: 1px solid var(--line-soft);
    border-radius: 9px;
    padding: 12px 13px;
    max-width: 64ch;
    transition: border-color .18s
}

.ex-item.show {
    border-color: var(--line)
}

.ex-check {
    flex: 0 0 auto;
    display: flex;
    cursor: pointer;
    margin-top: 1px
}

.ex-check input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0
}

.box {
    width: 20px;
    height: 20px;
    border-radius: 6px;
    border: 2px solid var(--line);
    background: var(--ink);
    display: grid;
    place-items: center;
    transition: .18s
}

.box svg {
    width: 12px;
    height: 12px;
    opacity: 0;
    transform: scale(.5);
    transition: .18s;
    color: #06281a
}

.ex-check input:checked+.box {
    background: var(--emerald);
    border-color: var(--emerald)
}

.ex-check input:checked+.box svg {
    opacity: 1;
    transform: scale(1)
}

.ex-check input:focus-visible+.box {
    outline: 2px solid var(--gold);
    outline-offset: 2px
}

.ex-content {
    flex: 1;
    min-width: 0
}

.ex-item.done .exq {
    color: var(--muted)
}

.ex-toggle {
    margin-top: 9px;
    font-family: "JetBrains Mono", monospace;
    font-size: 10.5px;
    letter-spacing: .05em;
    background: transparent;
    border: 1px solid var(--line);
    color: var(--muted);
    padding: 5px 11px;
    border-radius: 7px;
    cursor: pointer;
    transition: .15s
}

.ex-toggle:hover {
    color: var(--emerald);
    border-color: var(--emerald-dim)
}

.ex-a {
    display: none;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--line);
    font-size: 13px;
    color: #A9D9C2;
    line-height: 1.72
}

.ex-item.show .ex-a {
    display: block
}

.ex-a .lab {
    color: var(--emerald);
    font-weight: 600
}

.note {
    margin-top: 30px;
    text-align: center;
    font-size: 12.5px;
    color: var(--muted-2);
    font-family: "JetBrains Mono", monospace;
    letter-spacing: .02em;
    line-height: 1.9
}

.note .dot {
    color: var(--gold)
}

.banner {
    display: none;
    margin-top: 18px;
    padding: 16px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--emerald);
    background: rgba(61, 214, 140, .08);
    color: var(--emerald);
    font-family: "Space Grotesk", sans-serif;
    font-weight: 600;
    text-align: center
}

body.complete .banner {
    display: block
}

@media (max-width:560px) {
    .stage {
        grid-template-columns: 34px 1fr;
        gap: 10px
    }

    .node {
        width: 32px;
        height: 32px;
        font-size: 13px
    }

    .ctitle {
        font-size: 17px
    }

    .chead {
        padding: 14px 14px
    }

    .t-expand {
        padding: 12px 14px
    }

    .formula {
        margin-left: 14px;
        margin-right: 14px
    }

    .csub {
        display: none
    }

    .detail-pad {
        padding: 6px 16px 18px 16px
    }

    .prog-chip {
        font-size: 10px
    }
}

@media (prefers-reduced-motion:reduce) {
    * {
        transition: none !important;
        animation: none !important
    }
}

/* ===== Login ===== */
.login {
    max-width: 460px;
    margin: 48px auto 0;
    background: linear-gradient(180deg, var(--panel), var(--ink-2));
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 28px 24px;
    box-shadow: var(--shadow)
}

.login h2 {
    font-family: "Space Grotesk", sans-serif;
    font-size: 24px;
    margin: 0 0 8px;
    letter-spacing: -.01em
}

.login p {
    color: var(--muted);
    font-size: 14px;
    margin: 0 0 18px;
    line-height: 1.55
}

.login input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--ink);
    color: var(--text);
    font: inherit;
    font-size: 15px
}

.login input:focus {
    outline: 2px solid var(--gold);
    border-color: var(--gold)
}

.btn-primary {
    margin-top: 12px;
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: 0;
    background: var(--gold);
    color: #1a1606;
    font-weight: 700;
    font-family: "Space Grotesk", sans-serif;
    font-size: 15px;
    cursor: pointer;
    transition: .18s
}

.btn-primary:hover {
    background: var(--gold-soft)
}

.btn-primary:disabled {
    opacity: .6;
    cursor: wait
}

.login .msg {
    margin-top: 14px;
    font-size: 13.5px;
    color: var(--emerald);
    line-height: 1.55;
    min-height: 1em
}

.login .msg.err {
    color: var(--coral)
}

.login .who {
    margin: 18px 0 0;
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    color: var(--muted-2);
    line-height: 1.7
}

/* ===== Barra do usuário ===== */
.userbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-family: "JetBrains Mono", monospace;
    font-size: 11.5px;
    color: var(--muted);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line-soft)
}

.userbar b {
    color: var(--text);
    font-weight: 500
}

.activity {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    color: var(--muted-2);
    margin: 10px 2px 0;
    line-height: 1.7
}

.activity b {
    color: var(--muted);
    font-weight: 500
}

/* ===== Check em massa ===== */
.bulk {
    display: flex;
    gap: 8px;
    align-items: center;
    margin: 10px 18px 0;
    flex-wrap: wrap
}

.bulk-hint {
    font-family: "JetBrains Mono", monospace;
    font-size: 10.5px;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--muted-2)
}

.bulk .tbtn {
    font-size: 10.5px;
    padding: 6px 10px
}

.topic-bulk {
    display: flex;
    gap: 8px;
    margin: 0 0 10px;
    flex-wrap: wrap
}

/* ===== Contexto para o ChatGPT ===== */
.ctx-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    margin: 6px 0 16px;
    padding: 10px 12px;
    border: 1px dashed rgba(143, 184, 255, .4);
    border-radius: 10px;
    background: rgba(143, 184, 255, .05);
    max-width: 64ch
}

.ctx-hint {
    font-size: 12.5px;
    color: var(--muted);
    flex: 1;
    min-width: 200px
}

/* ===== Conceitos prévios ===== */
.dlabel.pre {
    color: #8FB8FF
}

.dlabel.pre::before {
    background: #8FB8FF
}

.pre-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 64ch
}

.pre-item {
    border: 1px solid var(--line-soft);
    border-left: 3px solid #8FB8FF;
    border-radius: 9px;
    background: var(--ink-2);
    overflow: hidden
}

.pre-item summary {
    cursor: pointer;
    padding: 10px 13px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px
}

.pre-item summary::-webkit-details-marker {
    display: none
}

.pre-item summary::after {
    content: "+";
    font-family: "JetBrains Mono", monospace;
    color: #8FB8FF;
    font-size: 15px
}

.pre-item[open] summary::after {
    content: "−"
}

.pre-item summary:hover {
    background: var(--panel-2)
}

.pre-c {
    padding: 2px 13px 13px;
    font-size: 13.5px;
    color: var(--body);
    line-height: 1.68
}

/* ===== Como fazer a conta ===== */
.dlabel.how {
    color: var(--gold)
}

.how-card {
    background: var(--ink-2);
    border: 1px solid var(--line-soft);
    border-left: 3px solid var(--gold);
    border-radius: 9px;
    padding: 12px 14px;
    margin-bottom: 10px;
    max-width: 64ch
}

.how-card:last-child {
    margin-bottom: 0
}

.how-t {
    font-weight: 600;
    color: var(--text);
    font-size: 14px;
    margin-bottom: 8px
}

.how-steps {
    margin: 0;
    padding-left: 22px;
    font-size: 13.5px;
    color: var(--body);
    line-height: 1.62
}

.how-steps li {
    margin-bottom: 5px;
    padding-left: 2px
}

.how-steps li::marker {
    color: var(--gold);
    font-family: "JetBrains Mono", monospace;
    font-size: 12px
}

.how-ex {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--line);
    font-size: 13px;
    color: #A9D9C2;
    line-height: 1.72
}

.how-ex .lab {
    color: var(--emerald);
    font-weight: 600
}

/* ===== Casos reais ===== */
.dlabel.cs {
    color: var(--coral)
}

.dlabel.cs::before {
    background: var(--coral)
}

.case-card {
    background: var(--ink-2);
    border: 1px solid var(--line-soft);
    border-left: 3px solid var(--coral);
    border-radius: 9px;
    padding: 12px 14px;
    margin-bottom: 10px;
    max-width: 64ch
}

.case-card:last-child {
    margin-bottom: 0
}

.case-t {
    font-weight: 600;
    color: var(--text);
    font-size: 14px;
    margin-bottom: 7px
}

.case-c {
    font-size: 13.5px;
    color: var(--body);
    line-height: 1.68
}

/* ===== Passo a passo (estilo ChatGPT) ===== */
.steps {
    list-style: none;
    margin: 12px 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px
}

.step {
    background: rgba(255, 255, 255, .025);
    border: 1px solid var(--line-soft);
    border-radius: 8px;
    padding: 10px 12px
}

.step-t {
    font-family: "Space Grotesk", sans-serif;
    font-weight: 600;
    font-size: 13.5px;
    color: var(--gold-soft);
    margin-bottom: 5px
}

.step-c {
    font-size: 13.5px;
    color: var(--body);
    line-height: 1.72
}

.answer {
    margin-top: 12px;
    padding: 10px 13px;
    border-radius: 8px;
    background: rgba(61, 214, 140, .1);
    border: 1px solid var(--emerald-dim);
    color: var(--emerald);
    font-weight: 600;
    font-size: 14px;
    line-height: 1.5
}

.answer .lab {
    font-family: "JetBrains Mono", monospace;
    font-size: 10.5px;
    letter-spacing: .1em;
    text-transform: uppercase;
    margin-right: 6px
}

.check {
    margin-top: 8px;
    font-size: 13px;
    color: #A9D9C2;
    line-height: 1.68
}

.we-actions {
    margin-top: 10px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap
}

/* ===== Kit básico ===== */
.stage.kit .node {
    border-color: #8FB8FF;
    color: #8FB8FF;
    background: #0f1730
}

.stage.kit .card {
    border-color: rgba(143, 184, 255, .3)
}

.stage.kit .tnum {
    color: #8FB8FF
}

.kit-intro {
    margin: 12px 18px 4px;
    font-size: 13.5px;
    color: var(--muted);
    line-height: 1.6;
    max-width: 68ch
}

/* ===== Banner de importação ===== */
.import-banner {
    margin-top: 14px;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid rgba(143, 184, 255, .4);
    background: rgba(143, 184, 255, .08);
    font-size: 13.5px;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    line-height: 1.5
}

.import-banner .acts {
    display: flex;
    gap: 8px
}

.toast {
    position: fixed;
    left: 50%;
    bottom: 22px;
    transform: translateX(-50%);
    background: var(--panel-2);
    border: 1px solid var(--line);
    color: var(--text);
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 13px;
    box-shadow: var(--shadow);
    z-index: 50;
    max-width: 90vw
}

.toast.err {
    border-color: var(--coral);
    color: var(--coral)
}

@media (max-width:560px) {
    .ctx-bar {
        padding: 9px 10px
    }

    .bulk {
        margin: 10px 14px 0
    }
}

.ctitle,
.csub {
    display: block
}

/* ===== Vídeo-aula da etapa ===== */
.vsec {
    margin: 14px 18px 4px
}

.dlabel.vd {
    color: #C58AF9
}

.dlabel.vd::before {
    background: #C58AF9
}

.stage-video {
    width: 100%;
    max-height: 540px;
    border-radius: 10px;
    background: #000;
    border: 1px solid var(--line);
    display: block
}

.vhint {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    color: var(--muted-2);
    margin: 7px 0 0;
    line-height: 1.6
}

@media (max-width:560px) {
    .vsec {
        margin: 12px 14px 4px
    }
}