/* ==========================================================
   BELAJAREDUTECH
   BANGUN RUANG SISI LENGKUNG
   MATEMATIKA SMP KELAS 9
========================================================== */

.curved-solid-grade-nine-page {
    --curved9-primary: #7c3aed;
    --curved9-primary-dark: #5b21b6;
    --curved9-primary-soft: #f5f3ff;

    --curved9-secondary: #0891b2;
    --curved9-secondary-soft: #ecfeff;

    --curved9-green: #0f766e;
    --curved9-green-soft: #f0fdfa;

    --curved9-pink: #db2777;
    --curved9-pink-soft: #fdf2f8;

    --curved9-orange: #c2410c;
    --curved9-orange-soft: #fff7ed;

    --curved9-text: #0f172a;
    --curved9-muted: #64748b;
    --curved9-border: #e2e8f0;
    --curved9-soft: #f8fafc;
}


.curved-solid-grade-nine-page .section {
    padding: 82px 0;
}


/* ==========================================================
   BREADCRUMB
========================================================== */

.curved-nine-breadcrumb-section {
    background: #ffffff;

    border-bottom: 1px solid var(--curved9-border);
}


.curved-nine-breadcrumb {
    min-height: 54px;

    display: flex;
    align-items: center;
    flex-wrap: wrap;

    gap: 8px;

    color: var(--curved9-muted);

    font-size: 0.76rem;
}


.curved-nine-breadcrumb a {
    color: var(--curved9-muted);

    text-decoration: none;
}


.curved-nine-breadcrumb a:hover {
    color: var(--curved9-primary);
}


.curved-nine-breadcrumb strong {
    color: #334155;
}


/* ==========================================================
   HERO
========================================================== */

.curved-nine-hero {
    overflow: hidden;

    padding: 76px 0 88px;

    background:
        radial-gradient(
            circle at 88% 14%,
            rgba(124, 58, 237, 0.15),
            transparent 30%
        ),
        radial-gradient(
            circle at 10% 88%,
            rgba(8, 145, 178, 0.1),
            transparent 31%
        ),
        linear-gradient(
            180deg,
            #faf8ff,
            #ffffff
        );
}


.curved-nine-hero-container {
    display: grid;

    grid-template-columns:
        minmax(0, 1.03fr)
        minmax(430px, 0.97fr);

    align-items: center;

    gap: 52px;
}


.curved-nine-hero-content,
.curved-nine-hero-visual {
    min-width: 0;
}


.curved-nine-topic-badge {
    width: fit-content;

    display: flex;
    align-items: center;

    gap: 10px;

    margin-bottom: 14px;

    color: var(--curved9-primary-dark);

    font-size: 0.67rem;
    font-weight: 850;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}


.curved-nine-topic-badge span {
    width: 36px;
    height: 36px;

    display: grid;
    place-items: center;

    color: #ffffff;
    background: var(--curved9-primary);

    border-radius: 11px;

    font-size: 0.6rem;
}


.curved-nine-hero-content h1 {
    max-width: 780px;

    margin: 0 0 22px;

    font-size:
        clamp(
            2.9rem,
            4.7vw,
            4.7rem
        );

    line-height: 1.01;
    letter-spacing: -0.052em;

    overflow-wrap: break-word;
}


.curved-nine-hero-content > p {
    max-width: 680px;

    margin: 0;

    color: var(--curved9-muted);

    line-height: 1.8;
}


.curved-nine-hero-actions {
    display: flex;
    flex-wrap: wrap;

    gap: 12px;

    margin-top: 30px;
}


.curved-nine-hero-meta {
    max-width: 680px;

    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 10px;

    margin-top: 34px;
}


.curved-nine-hero-meta > div {
    padding: 15px;

    background: rgba(255, 255, 255, 0.86);

    border: 1px solid var(--curved9-border);
    border-radius: 14px;
}


.curved-nine-hero-meta strong,
.curved-nine-hero-meta span {
    display: block;
}


.curved-nine-hero-meta strong {
    margin-bottom: 4px;

    color: var(--curved9-primary);

    font-size: 1rem;
}


.curved-nine-hero-meta span {
    color: var(--curved9-muted);

    font-size: 0.65rem;
}


/* ==========================================================
   HERO BOARD
========================================================== */

.curved-nine-hero-visual {
    width: 100%;
    max-width: 620px;

    margin-left: auto;
}


.curved-nine-board {
    padding: 30px;

    color: #ffffff;

    background:
        linear-gradient(
            145deg,
            #3b0764,
            #6d28d9 46%,
            #0e7490
        );

    border-radius: 30px;

    box-shadow:
        0 32px 85px
        rgba(91, 33, 182, 0.24);
}


.curved-nine-board-label {
    display: block;

    margin-bottom: 20px;

    color: rgba(255, 255, 255, 0.62);

    font-size: 0.6rem;
    font-weight: 850;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}


.curved-nine-board-solids {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    align-items: end;

    gap: 10px;
}


.curved-nine-board-solids > div {
    min-height: 220px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;

    padding: 15px;

    background: rgba(255, 255, 255, 0.06);

    border-radius: 15px;
}


.curved-nine-board-solids strong {
    margin-top: 15px;

    color: #ffffff;

    font-size: 0.76rem;
}


/* CYLINDER */

.curved-nine-cylinder-visual,
.curved-nine-live-cylinder {
    position: relative;

    width: 105px;
    height: 130px;
}


.curved-nine-cylinder-visual .body,
.curved-nine-live-cylinder .body {
    position: absolute;

    inset: 16px 0;

    background:
        linear-gradient(
            90deg,
            rgba(103, 232, 249, 0.15),
            rgba(103, 232, 249, 0.55),
            rgba(103, 232, 249, 0.15)
        );

    border-left: 3px solid #67e8f9;
    border-right: 3px solid #67e8f9;
}


.curved-nine-cylinder-visual .top,
.curved-nine-cylinder-visual .bottom,
.curved-nine-live-cylinder .top,
.curved-nine-live-cylinder .bottom {
    position: absolute;

    left: 0;

    width: 100%;
    height: 32px;

    border: 3px solid #67e8f9;
    border-radius: 50%;
}


.curved-nine-cylinder-visual .top,
.curved-nine-live-cylinder .top {
    top: 0;

    background: rgba(103, 232, 249, 0.16);
}


.curved-nine-cylinder-visual .bottom,
.curved-nine-live-cylinder .bottom {
    bottom: 0;

    background: rgba(103, 232, 249, 0.09);
}


/* CONE */

.curved-nine-cone-visual,
.curved-nine-live-cone {
    position: relative;

    width: 120px;
    height: 140px;
}


.curved-nine-cone-visual .body,
.curved-nine-live-cone .body {
    position: absolute;

    left: 10px;
    top: 0;

    width: 100px;
    height: 120px;

    background:
        linear-gradient(
            145deg,
            rgba(249, 168, 212, 0.2),
            rgba(249, 168, 212, 0.5)
        );

    clip-path:
        polygon(
            50% 0,
            100% 100%,
            0 100%
        );
}


.curved-nine-cone-visual .bottom,
.curved-nine-live-cone .bottom {
    position: absolute;

    left: 10px;
    bottom: 0;

    width: 100px;
    height: 28px;

    background: rgba(249, 168, 212, 0.14);

    border: 3px solid #f9a8d4;
    border-radius: 50%;
}


/* SPHERE */

.curved-nine-sphere-visual,
.curved-nine-live-sphere {
    display: grid;
    place-items: center;

    width: 125px;
    height: 140px;
}


.curved-nine-sphere-visual > span,
.curved-nine-live-sphere > span {
    width: 112px;
    height: 112px;

    display: block;

    background:
        radial-gradient(
            circle at 35% 28%,
            rgba(255, 255, 255, 0.65),
            rgba(134, 239, 172, 0.38) 28%,
            rgba(15, 118, 110, 0.72) 72%
        );

    border: 3px solid #86efac;
    border-radius: 50%;

    box-shadow:
        inset -18px -14px 28px
        rgba(15, 23, 42, 0.2);
}


.curved-nine-board-relation {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 8px;

    margin-top: 12px;
}


.curved-nine-board-relation > div {
    padding: 12px;

    color: #334155;
    background: #ffffff;

    border-radius: 12px;

    text-align: center;
}


.curved-nine-board-relation span,
.curved-nine-board-relation strong {
    display: block;
}


.curved-nine-board-relation span {
    margin-bottom: 5px;

    color: var(--curved9-muted);

    font-size: 0.48rem;
}


.curved-nine-board-relation strong {
    color: var(--curved9-primary-dark);

    font-size: 0.82rem;
}


/* ==========================================================
   PROGRESS
========================================================== */

.curved-nine-progress-section {
    padding: 14px 0;

    background: #ffffff;

    border-top: 1px solid var(--curved9-border);
    border-bottom: 1px solid var(--curved9-border);
}


.curved-nine-progress-list {
    display: flex;
    align-items: center;

    gap: 8px;

    overflow-x: auto;

    padding-bottom: 3px;
}


.curved-nine-progress-list a {
    flex-shrink: 0;

    display: flex;
    align-items: center;

    gap: 7px;

    padding: 8px 11px;

    color: var(--curved9-muted);
    background: var(--curved9-soft);

    border: 1px solid var(--curved9-border);
    border-radius: 999px;

    text-decoration: none;

    font-size: 0.68rem;
    font-weight: 750;
}


.curved-nine-progress-list a:hover {
    color: var(--curved9-primary-dark);
    background: var(--curved9-primary-soft);
    border-color: #c4b5fd;
}


.curved-nine-progress-list span {
    color: var(--curved9-primary);

    font-size: 0.58rem;
    font-weight: 900;
}


/* ==========================================================
   COMMON
========================================================== */

.curved-nine-two-column {
    display: grid;

    grid-template-columns:
        minmax(0, 0.78fr)
        minmax(500px, 1.22fr);

    align-items: center;

    gap: 70px;
}


.curved-nine-section-content h2 {
    margin: 12px 0 18px;

    font-size:
        clamp(
            2.25rem,
            4.3vw,
            3.8rem
        );

    line-height: 1.05;
    letter-spacing: -0.045em;
}


.curved-nine-section-content p {
    color: var(--curved9-muted);

    line-height: 1.8;
}


.curved-nine-inline-rule {
    margin-top: 20px;
    padding: 17px;

    color: var(--curved9-primary-dark);
    background: var(--curved9-primary-soft);

    border: 1px solid #ddd6fe;
    border-radius: 14px;

    font-size: 1.05rem;
    font-weight: 900;

    text-align: center;
}


/* ==========================================================
   OBJECTIVES
========================================================== */

.curved-nine-objective-section {
    background: #ffffff;
}


.curved-nine-objective-list {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 10px;
}


.curved-nine-objective-list article {
    min-height: 145px;

    padding: 18px;

    background: var(--curved9-soft);

    border: 1px solid var(--curved9-border);
    border-radius: 17px;
}


.curved-nine-objective-list article > span,
.curved-nine-strategy-grid article > span {
    width: 38px;
    height: 38px;

    display: grid;
    place-items: center;

    margin-bottom: 12px;

    color: #ffffff;
    background: var(--curved9-primary);

    border-radius: 50%;

    font-size: 0.55rem;
    font-weight: 900;
}


.curved-nine-objective-list p {
    margin: 0;

    color: var(--curved9-muted);

    line-height: 1.65;
}


/* ==========================================================
   INTRO
========================================================== */

.curved-nine-intro-section {
    background: var(--curved9-soft);
}


.curved-nine-type-grid,
.curved-nine-element-grid,
.curved-nine-strategy-grid {
    display: grid;

    gap: 14px;
}


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


.curved-nine-element-grid,
.curved-nine-strategy-grid {
    grid-template-columns:
        repeat(4, minmax(0, 1fr));
}


.curved-nine-type-grid article,
.curved-nine-element-grid article,
.curved-nine-strategy-grid article {
    min-height: 235px;

    padding: 22px;

    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 20px;
}


.curved-nine-type-symbol {
    width: 56px;
    height: 56px;

    display: grid;
    place-items: center;

    margin-bottom: 15px;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            var(--curved9-primary),
            var(--curved9-secondary)
        );

    border-radius: 16px;

    font-size: 1.3rem;
    font-weight: 900;
}


.curved-nine-type-grid article > span {
    display: block;

    margin-bottom: 6px;

    color: var(--curved9-primary);

    font-size: 0.56rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-type-grid h3,
.curved-nine-strategy-grid h3 {
    margin: 0 0 9px;
}


.curved-nine-type-grid p,
.curved-nine-element-grid p,
.curved-nine-strategy-grid p {
    margin: 0;

    color: var(--curved9-muted);

    line-height: 1.65;
}


/* ==========================================================
   ELEMENT
========================================================== */

.curved-nine-element-section {
    background: #ffffff;
}


.curved-nine-element-grid article > span {
    width: 46px;
    height: 46px;

    display: grid;
    place-items: center;

    margin-bottom: 13px;

    color: #ffffff;
    background: var(--curved9-primary);

    border-radius: 14px;

    font-size: 1rem;
    font-weight: 900;
}


.curved-nine-element-grid strong {
    display: block;

    margin-bottom: 8px;
}


/* ==========================================================
   CYLINDER / CONE / SPHERE
========================================================== */

.curved-nine-cylinder-section,
.curved-nine-sphere-section {
    background: var(--curved9-soft);
}


.curved-nine-cone-section {
    background: #ffffff;
}


.curved-nine-formula-card {
    padding: 28px;

    color: #ffffff;

    background:
        linear-gradient(
            145deg,
            #3b0764,
            #0f172a
        );

    border-radius: 25px;
}


.curved-nine-formula-card > span {
    display: block;

    margin-bottom: 16px;

    color: #f9a8d4;

    font-size: 0.62rem;
    font-weight: 850;
    text-transform: uppercase;

    text-align: center;
}


.curved-nine-formula-grid {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 9px;
}


.curved-nine-formula-grid.two {
    grid-template-columns:
        repeat(2, minmax(0, 1fr));
}


.curved-nine-formula-grid > div {
    min-height: 150px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 15px;

    background: rgba(255, 255, 255, 0.07);

    border-radius: 14px;

    text-align: center;
}


.curved-nine-formula-grid small,
.curved-nine-formula-grid strong {
    display: block;
}


.curved-nine-formula-grid small {
    margin-bottom: 8px;

    color: rgba(255, 255, 255, 0.62);
}


.curved-nine-formula-grid strong {
    color: #67e8f9;

    font-size: 1.05rem;
}


/* ==========================================================
   EXAMPLE FLOW
========================================================== */

.curved-nine-example-section,
.curved-nine-sphere-example-section {
    background: #ffffff;
}


.curved-nine-step-flow {
    display: grid;

    grid-template-columns:
        1fr auto
        1.25fr auto
        1fr auto
        1fr;

    align-items: center;

    gap: 9px;
}


.curved-nine-step-flow > div {
    min-height: 160px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 17px;

    background: var(--curved9-soft);

    border: 1px solid var(--curved9-border);
    border-radius: 17px;

    text-align: center;
}


.curved-nine-step-flow span,
.curved-nine-step-flow strong {
    display: block;
}


.curved-nine-step-flow span {
    margin-bottom: 7px;

    color: var(--curved9-muted);

    font-size: 0.52rem;
}


.curved-nine-step-flow strong {
    margin: 2px 0;

    color: var(--curved9-primary-dark);
}


.curved-nine-step-flow > i {
    color: var(--curved9-pink);

    font-style: normal;
    font-weight: 900;
}


.curved-nine-step-flow .result {
    color: #ffffff;
    background: var(--curved9-green);
    border-color: var(--curved9-green);
}


.curved-nine-step-flow .result span,
.curved-nine-step-flow .result strong {
    color: #ffffff;
}


/* ==========================================================
   CONE RELATION
========================================================== */

.curved-nine-cone-relation-section,
.curved-nine-volume-relation-section {
    background: var(--curved9-soft);
}


.curved-nine-cone-relation-card {
    display: grid;

    grid-template-columns:
        1fr auto
        1fr auto
        1.2fr auto
        1fr;

    align-items: center;

    gap: 8px;

    padding: 24px;

    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 22px;
}


.curved-nine-cone-relation-card > div {
    min-height: 135px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 13px;

    background: var(--curved9-soft);

    border-radius: 13px;

    text-align: center;
}


.curved-nine-cone-relation-card span,
.curved-nine-cone-relation-card strong {
    display: block;
}


.curved-nine-cone-relation-card span {
    margin-bottom: 6px;

    color: var(--curved9-muted);

    font-size: 0.51rem;
}


.curved-nine-cone-relation-card strong {
    color: var(--curved9-primary-dark);
}


.curved-nine-cone-relation-card > i {
    color: var(--curved9-pink);

    font-style: normal;
    font-weight: 900;
}


.curved-nine-cone-relation-card .result {
    color: #ffffff;
    background: var(--curved9-green);
}


.curved-nine-cone-relation-card .result span,
.curved-nine-cone-relation-card .result strong {
    color: #ffffff;
}


/* ==========================================================
   VOLUME RELATION
========================================================== */

.curved-nine-volume-relation-card {
    max-width: 740px;

    display: grid;

    grid-template-columns:
        1fr auto 1fr;

    align-items: center;

    gap: 12px;

    margin-inline: auto;
    padding: 24px;

    color: #ffffff;

    background:
        linear-gradient(
            145deg,
            #3b0764,
            #0f172a
        );

    border-radius: 24px;
}


.curved-nine-volume-relation-card > div {
    min-height: 150px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 15px;

    background: rgba(255, 255, 255, 0.07);

    border-radius: 14px;

    text-align: center;
}


.curved-nine-volume-relation-card span,
.curved-nine-volume-relation-card strong {
    display: block;
}


.curved-nine-volume-relation-card span {
    margin-bottom: 8px;

    color: rgba(255, 255, 255, 0.62);
}


.curved-nine-volume-relation-card > i {
    color: #f9a8d4;

    font-style: normal;
    font-weight: 900;
}


.curved-nine-volume-relation-card .result {
    background: var(--curved9-green);
}


/* ==========================================================
   COMPARISON
========================================================== */

.curved-nine-comparison-section {
    background: var(--curved9-soft);
}


.curved-nine-comparison-grid {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 16px;
}


.curved-nine-comparison-grid article {
    min-height: 220px;

    padding: 23px;

    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 21px;
}


.curved-nine-comparison-grid span {
    display: block;

    margin-bottom: 13px;

    color: var(--curved9-primary);

    font-size: 0.58rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-comparison-grid strong {
    display: block;

    margin-bottom: 12px;

    color: var(--curved9-primary-dark);

    font-size: 1.17rem;
}


.curved-nine-comparison-grid small {
    color: var(--curved9-green);

    font-weight: 800;
}


/* ==========================================================
   PI
========================================================== */

.curved-nine-pi-section {
    background: #ffffff;
}


.curved-nine-pi-card {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 9px;

    padding: 24px;

    color: #ffffff;

    background:
        linear-gradient(
            145deg,
            #3b0764,
            #0f172a
        );

    border-radius: 24px;
}


.curved-nine-pi-card > div {
    min-height: 170px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 15px;

    background: rgba(255, 255, 255, 0.07);

    border-radius: 14px;

    text-align: center;
}


.curved-nine-pi-card span,
.curved-nine-pi-card strong {
    display: block;
}


.curved-nine-pi-card span {
    margin-bottom: 8px;

    color: rgba(255, 255, 255, 0.62);

    font-size: 0.53rem;
}


.curved-nine-pi-card strong {
    color: #67e8f9;
}


/* ==========================================================
   MISTAKES
========================================================== */

.curved-nine-mistake-section {
    background: var(--curved9-soft);
}


.curved-nine-mistake-grid {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 16px;
}


.curved-nine-mistake-grid article {
    min-height: 250px;

    padding: 23px;

    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 21px;
}


.curved-nine-mistake-grid article > span {
    display: block;

    margin-bottom: 13px;

    color: var(--curved9-primary);

    font-size: 0.58rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-mistake-grid strong {
    display: block;

    margin-bottom: 12px;
}


.curved-nine-mistake-grid p {
    margin: 0;

    color: var(--curved9-muted);

    line-height: 1.65;
}


/* ==========================================================
   STRATEGY
========================================================== */

.curved-nine-strategy-section {
    background: #ffffff;
}


/* ==========================================================
   LAB
========================================================== */

.curved-nine-lab-section {
    color: #ffffff;

    background: #0f172a;
}


.curved-nine-lab-section .section-eyebrow {
    color: #d8b4fe;
}


.curved-nine-lab-section .section-header p {
    color: #94a3b8;
}


.curved-nine-lab-card {
    max-width: 1120px;

    margin: 0 auto 20px;
    padding: 30px;

    background: rgba(255, 255, 255, 0.06);

    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 28px;
}


.curved-nine-lab-heading {
    margin-bottom: 24px;

    text-align: center;
}


.curved-nine-lab-heading > span {
    display: block;

    margin-bottom: 5px;

    color: #d8b4fe;

    font-size: 0.6rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-lab-heading h3 {
    margin: 0 0 7px;

    color: #ffffff;
}


.curved-nine-lab-heading p {
    margin: 0;

    color: #94a3b8;
}


/* ==========================================================
   CALCULATOR
========================================================== */

.curved-nine-calculator {
    display: grid;

    grid-template-columns:
        0.4fr 0.6fr;

    gap: 12px;

    margin-bottom: 12px;
}


.curved-nine-calculator-controls {
    display: flex;
    flex-direction: column;

    gap: 9px;
}


.curved-nine-calculator-controls label {
    padding: 15px;

    color: #334155;
    background: #ffffff;

    border-radius: 13px;
}


.curved-nine-calculator-controls label > span {
    display: block;

    margin-bottom: 7px;

    color: var(--curved9-muted);

    font-size: 0.51rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-calculator-controls input,
.curved-nine-calculator-controls select {
    width: 100%;
}


.curved-nine-calculator-controls input {
    accent-color: var(--curved9-primary);
}


.curved-nine-calculator-controls select {
    min-height: 40px;

    padding: 8px;

    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 8px;
}


.curved-nine-calculator-controls strong {
    display: block;

    margin-top: 7px;

    color: var(--curved9-primary-dark);

    text-align: center;
}


.curved-nine-calculator-controls .is-hidden {
    display: none;
}


.curved-nine-calculator-output {
    min-height: 400px;

    display: flex;
    flex-direction: column;
    justify-content: center;

    padding: 22px;

    color: #334155;
    background: #ffffff;

    border-radius: 16px;
}


.curved-nine-live-solid {
    min-height: 255px;

    display: grid;
    place-items: center;

    margin-bottom: 15px;

    background: var(--curved9-soft);

    border-radius: 14px;
}


.curved-nine-live-cylinder {
    transform: scale(1.35);
}


.curved-nine-live-cone {
    transform: scale(1.35);
}


.curved-nine-live-sphere {
    transform: scale(1.35);
}


.curved-nine-live-cylinder.is-hidden,
.curved-nine-live-cone.is-hidden,
.curved-nine-live-sphere.is-hidden {
    display: none;
}


.curved-nine-live-formula {
    padding: 15px;

    color: #ffffff;
    background: var(--curved9-primary);

    border-radius: 13px;

    text-align: center;
}


.curved-nine-live-formula span,
.curved-nine-live-formula strong {
    display: block;
}


.curved-nine-live-formula span {
    margin-bottom: 6px;

    color: rgba(255, 255, 255, 0.72);

    font-size: 0.5rem;
}


.curved-nine-calculator-results {
    display: grid;

    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 8px;

    margin-bottom: 10px;
}


.curved-nine-calculator-results > div {
    min-height: 105px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 13px;

    color: #334155;
    background: #ffffff;

    border-radius: 13px;

    text-align: center;
}


.curved-nine-calculator-results span,
.curved-nine-calculator-results strong {
    display: block;
}


.curved-nine-calculator-results span {
    margin-bottom: 5px;

    color: var(--curved9-muted);

    font-size: 0.48rem;
    text-transform: uppercase;
}


.curved-nine-calculator-results strong {
    color: var(--curved9-primary-dark);
}


.curved-nine-calculator-results .result {
    color: #ffffff;
    background: var(--curved9-green);
}


.curved-nine-calculator-results .result span,
.curved-nine-calculator-results .result strong {
    color: #ffffff;
}


.curved-nine-lab-message {
    margin-bottom: 12px;
    padding: 14px;

    color: #e9d5ff;
    background: rgba(124, 58, 237, 0.12);

    border: 1px solid rgba(196, 181, 253, 0.2);
    border-radius: 11px;

    text-align: center;

    line-height: 1.6;
}


.curved-nine-preset-buttons {
    display: grid;

    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 8px;
}


.curved-nine-preset-buttons button {
    min-height: 44px;

    padding: 10px;

    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.06);

    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;

    font-weight: 800;
}


/* ==========================================================
   RATIO LAB
========================================================== */

.curved-nine-ratio-lab {
    display: grid;

    grid-template-columns:
        0.35fr 0.65fr;

    gap: 12px;

    margin-bottom: 12px;
}


.curved-nine-ratio-controls {
    display: flex;
    flex-direction: column;

    gap: 9px;
}


.curved-nine-ratio-controls label {
    padding: 16px;

    color: #334155;
    background: #ffffff;

    border-radius: 14px;
}


.curved-nine-ratio-controls span {
    display: block;

    margin-bottom: 7px;

    color: var(--curved9-muted);

    font-size: 0.51rem;
    text-transform: uppercase;
}


.curved-nine-ratio-controls input {
    width: 100%;

    accent-color: var(--curved9-primary);
}


.curved-nine-ratio-controls strong {
    display: block;

    margin-top: 7px;

    color: var(--curved9-primary-dark);

    text-align: center;
}


.curved-nine-ratio-machine {
    display: grid;

    grid-template-columns:
        1fr auto 1fr;

    align-items: center;

    gap: 10px;

    padding: 20px;

    background: rgba(255, 255, 255, 0.04);

    border-radius: 16px;
}


.curved-nine-ratio-machine > div {
    min-height: 160px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 15px;

    color: #334155;
    background: #ffffff;

    border-radius: 14px;

    text-align: center;
}


.curved-nine-ratio-machine span,
.curved-nine-ratio-machine strong {
    display: block;
}


.curved-nine-ratio-machine span {
    margin-bottom: 7px;

    color: var(--curved9-muted);

    font-size: 0.5rem;
}


.curved-nine-ratio-machine strong {
    color: var(--curved9-primary-dark);
}


.curved-nine-ratio-machine > i {
    color: #f9a8d4;

    font-style: normal;
    font-weight: 900;
}


.curved-nine-ratio-machine .result {
    color: #ffffff;
    background: var(--curved9-green);
}


.curved-nine-ratio-machine .result span,
.curved-nine-ratio-machine .result strong {
    color: #ffffff;
}


/* ==========================================================
   PRACTICE
========================================================== */

.curved-nine-practice-section {
    background: var(--curved9-soft);
}


.curved-nine-practice-grid {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 16px;
}


.curved-nine-practice-grid article {
    min-height: 310px;

    padding: 23px;

    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 21px;
}


.curved-nine-practice-grid article > span {
    display: block;

    margin-bottom: 12px;

    color: var(--curved9-primary);

    font-size: 0.59rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-practice-grid h3 {
    min-height: 115px;

    margin: 0 0 18px;
}


.curved-nine-practice-grid details {
    padding-top: 14px;

    border-top: 1px solid var(--curved9-border);
}


.curved-nine-practice-grid summary {
    color: var(--curved9-primary-dark);

    cursor: pointer;

    font-weight: 800;
}


.curved-nine-practice-grid details p {
    color: var(--curved9-muted);

    line-height: 1.65;
}


/* ==========================================================
   QUIZ
========================================================== */

.curved-nine-quiz-section {
    background: #ffffff;
}


.curved-nine-quiz-wrapper {
    max-width: 980px;

    margin-inline: auto;
}


.curved-nine-quiz-heading {
    margin-bottom: 25px;

    text-align: center;
}


.curved-nine-quiz-heading h2 {
    margin: 8px 0;
}


.curved-nine-quiz-heading p {
    margin: 0;

    color: var(--curved9-muted);
}


.curved-nine-quiz-card {
    padding: 28px;

    background: var(--curved9-soft);

    border: 1px solid var(--curved9-border);
    border-radius: 26px;
}


.curved-nine-quiz-question {
    padding: 22px 0;

    border-bottom: 1px solid var(--curved9-border);
}


.curved-nine-quiz-question:first-child {
    padding-top: 0;
}


.curved-nine-quiz-question > span {
    display: block;

    margin-bottom: 8px;

    color: var(--curved9-primary);

    font-size: 0.58rem;
    font-weight: 900;
}


.curved-nine-quiz-question h3 {
    margin: 0 0 15px;
}


.curved-nine-quiz-options {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 8px;
}


.curved-nine-quiz-options button {
    min-height: 48px;

    padding: 10px;

    color: #334155;
    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 11px;

    font-weight: 750;
}


.curved-nine-quiz-options button.selected {
    color: var(--curved9-primary-dark);
    background: var(--curved9-primary-soft);
    border-color: #c4b5fd;
}


.curved-nine-quiz-options button.correct {
    color: #166534;
    background: #dcfce7;
    border-color: #86efac;
}


.curved-nine-quiz-options button.incorrect {
    color: #991b1b;
    background: #fee2e2;
    border-color: #fca5a5;
}


.curved-nine-quiz-footer {
    display: flex;
    align-items: center;
    flex-wrap: wrap;

    gap: 10px;

    padding-top: 22px;
}


.curved-nine-quiz-result {
    flex-basis: 100%;

    color: #334155;

    font-weight: 750;
}


/* ==========================================================
   SUMMARY
========================================================== */

.curved-nine-summary-section {
    background: var(--curved9-soft);
}


.curved-nine-summary-card {
    padding: 35px;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            #6d28d9,
            #7c3aed 48%,
            #0e7490
        );

    border-radius: 28px;
}


.curved-nine-summary-card > div:first-child {
    margin-bottom: 25px;
}


.curved-nine-summary-card > div:first-child > span {
    display: block;

    margin-bottom: 6px;

    color: rgba(255, 255, 255, 0.67);

    font-size: 0.6rem;
    font-weight: 850;
    text-transform: uppercase;
}


.curved-nine-summary-card h2 {
    margin: 0;

    color: #ffffff;
}


.curved-nine-summary-grid {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 10px;
}


.curved-nine-summary-grid p {
    margin: 0;
    padding: 16px;

    color: rgba(255, 255, 255, 0.78);
    background: rgba(255, 255, 255, 0.07);

    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 14px;

    line-height: 1.65;
}


.curved-nine-summary-grid strong {
    color: #67e8f9;
}


/* ==========================================================
   COMPLETION
========================================================== */

.curved-nine-completion-section {
    background: #ffffff;
}


.curved-nine-completion-card {
    max-width: 920px;

    margin-inline: auto;
    padding: 42px;

    background:
        linear-gradient(
            135deg,
            var(--curved9-primary-soft),
            var(--curved9-secondary-soft)
        );

    border: 1px solid #ddd6fe;
    border-radius: 28px;

    text-align: center;
}


.curved-nine-completion-card > span {
    display: block;

    margin-bottom: 10px;

    color: var(--curved9-primary);

    font-size: 0.6rem;
    font-weight: 900;
    text-transform: uppercase;
}


.curved-nine-completion-card h2 {
    margin: 0 auto 14px;

    max-width: 720px;
}


.curved-nine-completion-card p {
    max-width: 620px;

    margin: 0 auto 24px;

    color: var(--curved9-muted);

    line-height: 1.7;
}


/* ==========================================================
   NAVIGATION
========================================================== */

.curved-nine-navigation-section {
    padding: 40px 0 70px;

    background: var(--curved9-soft);
}


.curved-nine-navigation {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 12px;
}


.curved-nine-navigation-card {
    display: flex;
    align-items: center;

    gap: 15px;

    padding: 20px;

    color: #334155;
    background: #ffffff;

    border: 1px solid var(--curved9-border);
    border-radius: 17px;

    text-decoration: none;
}


.curved-nine-navigation-card.next {
    justify-content: flex-end;

    text-align: right;
}


.curved-nine-navigation-card > span {
    color: var(--curved9-primary);

    font-size: 1.25rem;
    font-weight: 900;
}


.curved-nine-navigation-card small,
.curved-nine-navigation-card strong,
.curved-nine-navigation-card div > span {
    display: block;
}


.curved-nine-navigation-card small {
    margin-bottom: 4px;

    color: var(--curved9-muted);
}


.curved-nine-navigation-card div > span {
    margin-top: 4px;

    color: var(--curved9-muted);

    font-size: 0.62rem;
}


.curved-nine-navigation-card.disabled {
    opacity: 0.58;

    cursor: default;
}


/* ==========================================================
   RESPONSIVE
========================================================== */

@media (max-width: 1120px) {

    .curved-nine-hero-container,
    .curved-nine-two-column {
        grid-template-columns: 1fr;

        gap: 48px;
    }


    .curved-nine-hero-content {
        max-width: 820px;
    }


    .curved-nine-hero-visual,
    .curved-nine-formula-card,
    .curved-nine-pi-card {
        width: 100%;
        max-width: 820px;

        margin-inline: auto;
    }


    .curved-nine-element-grid,
    .curved-nine-strategy-grid {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

}


@media (max-width: 880px) {

    .curved-nine-type-grid,
    .curved-nine-comparison-grid,
    .curved-nine-mistake-grid {
        grid-template-columns: 1fr;
    }


    .curved-nine-calculator,
    .curved-nine-ratio-lab {
        grid-template-columns: 1fr;
    }


    .curved-nine-calculator-results {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

}


@media (max-width: 680px) {

    .curved-solid-grade-nine-page .section {
        padding: 62px 0;
    }


    .curved-nine-hero {
        padding: 52px 0 64px;
    }


    .curved-nine-hero-content h1 {
        font-size:
            clamp(
                2.35rem,
                10.7vw,
                3.55rem
            );

        line-height: 1.04;
    }


    .curved-nine-hero-actions {
        flex-direction: column;
    }


    .curved-nine-hero-actions .button {
        width: 100%;
    }


    .curved-nine-hero-meta,
    .curved-nine-objective-list,
    .curved-nine-element-grid,
    .curved-nine-strategy-grid,
    .curved-nine-practice-grid,
    .curved-nine-summary-grid,
    .curved-nine-navigation,
    .curved-nine-pi-card {
        grid-template-columns: 1fr;
    }


    .curved-nine-board-solids,
    .curved-nine-board-relation {
        grid-template-columns: 1fr;
    }


    .curved-nine-board-solids > div {
        min-height: 190px;
    }


    .curved-nine-formula-grid,
    .curved-nine-formula-grid.two {
        grid-template-columns: 1fr;
    }


    .curved-nine-step-flow,
    .curved-nine-cone-relation-card,
    .curved-nine-volume-relation-card,
    .curved-nine-ratio-machine {
        grid-template-columns: 1fr;
    }


    .curved-nine-step-flow > i {
        transform: rotate(90deg);

        justify-self: center;
    }


    .curved-nine-cone-relation-card > i,
    .curved-nine-volume-relation-card > i,
    .curved-nine-ratio-machine > i {
        justify-self: center;
    }


    .curved-nine-calculator-results {
        grid-template-columns: 1fr;
    }


    .curved-nine-preset-buttons {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }


    .curved-nine-quiz-options {
        grid-template-columns: 1fr;
    }


    .curved-nine-navigation-card.next {
        justify-content: flex-start;

        text-align: left;
    }


    .curved-nine-completion-card {
        padding: 30px 22px;
    }

}


@media (max-width: 460px) {

    .curved-nine-board,
    .curved-nine-lab-card,
    .curved-nine-quiz-card,
    .curved-nine-summary-card {
        padding: 20px;
    }


    .curved-nine-preset-buttons {
        grid-template-columns: 1fr;
    }

}