/* ======================================== */
/* STUDYNEST MONEY & FINANCE LESSONS                  */
/* ======================================== */

:root {
    --navy: #0f438c;
    --navy-dark: #0a326b;
    --blue: #3f816c;
    --blue-light: #f8edc7;
    --page: #eef4fb;
    --card: #ffffff;
    --border: #d9e2ed;
    --text: #1e2c43;
    --muted: #4f5d70;
    --yellow: #fff2bf;
    --yellow-border: #f5ad00;
    --green: #e4f5e8;
    --green-dark: #2f7444;
    --pink: #f8e8ef;
    --pink-dark: #8b4664;
    --purple: #eee8f8;
    --purple-dark: #654d91;
    --shadow: 0 12px 30px rgba(19, 57, 104, 0.07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    color: var(--text);
    background: var(--page);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.65;
}

a { color: inherit; text-decoration: none; }

.announcement-bar {
    padding: 8px 18px;
    color: #111;
    background: #f7b500;
    font-size: .82rem;
    font-weight: 700;
    text-align: center;
}

.site-header {
    display: flex;
    min-height: 76px;
    padding: 0 38px;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    border-bottom: 1px solid var(--border);
    background: white;
}

.logo {
    color: var(--navy);
    font-size: 1.45rem;
    font-weight: 800;
}

.main-navigation {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.main-navigation a {
    font-size: .88rem;
    font-weight: 700;
}

.lesson-hero {
    display: grid;
    min-height: 400px;
    padding: 60px clamp(22px, 7vw, 95px);
    align-items: center;
    grid-template-columns: minmax(0, 1.1fr) minmax(310px, .9fr);
    gap: 45px;
    background:
        radial-gradient(circle at 85% 15%, rgba(255,255,255,.95), transparent 26%),
        linear-gradient(135deg, #f8fbff, #eaf2fb);
}

.lesson-label,
.eyebrow {
    margin: 0 0 10px;
    color: var(--navy);
    font-size: .78rem;
    font-weight: 900;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.lesson-hero h1 {
    margin: 0;
    color: var(--navy);
    font-size: clamp(2.9rem, 6vw, 4.8rem);
    line-height: 1.04;
    letter-spacing: -.04em;
}

.lesson-subtitle {
    max-width: 680px;
    margin: 20px 0 0;
    color: var(--muted);
    font-size: 1.08rem;
}

.lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.meta-pill {
    padding: 8px 13px;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--navy);
    background: white;
    font-size: .78rem;
    font-weight: 800;
}

.hero-visual {
    display: grid;
    min-height: 270px;
    place-items: center;
}

.mini-coordinate-plane {
    position: relative;
    width: 290px;
    height: 245px;
    border: 1px solid var(--border);
    border-radius: 25px;
    background:
        linear-gradient(#dfe8f2 1px, transparent 1px),
        linear-gradient(90deg, #dfe8f2 1px, transparent 1px),
        white;
    background-size: 32px 32px;
    box-shadow: var(--shadow);
}

.mini-coordinate-plane::before,
.mini-coordinate-plane::after {
    content: "";
    position: absolute;
    background: var(--navy);
}

.mini-coordinate-plane::before {
    top: 20px;
    bottom: 20px;
    left: 50%;
    width: 3px;
}

.mini-coordinate-plane::after {
    right: 20px;
    bottom: 50%;
    left: 20px;
    height: 3px;
}

.plot-dot {
    position: absolute;
    z-index: 2;
    width: 15px;
    height: 15px;
    border: 3px solid white;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 3px 9px rgba(15,67,140,.25);
}

.dot-a { left: 205px; top: 55px; }
.dot-b { left: 75px; top: 155px; }
.dot-c { left: 180px; top: 180px; }

.graph-line-demo {
    position: absolute;
    z-index: 1;
    left: 55px;
    bottom: 65px;
    width: 205px;
    height: 5px;
    border-radius: 999px;
    background: var(--blue);
    transform: rotate(-36deg);
    transform-origin: left center;
}

.lesson-main {
    width: min(1180px, calc(100% - 28px));
    margin: 36px auto 70px;
}

.lesson-section {
    margin-bottom: 28px;
    padding: 38px 52px;
    border: 1px solid var(--border);
    border-radius: 27px;
    background: white;
    box-shadow: var(--shadow);
}

.lesson-section h2 {
    margin: 0 0 18px;
    color: var(--navy);
    font-size: clamp(1.65rem, 3vw, 2.25rem);
}

.lesson-section h3 {
    margin: 25px 0 10px;
    color: var(--navy);
}

.lesson-section p { color: var(--muted); }

.objective-list,
.summary-list,
.practice-list {
    margin: 14px 0 0;
    padding-left: 24px;
}

.objective-list li,
.summary-list li,
.practice-list li {
    margin: 8px 0;
}

.think-box,
.key-idea,
.tip-box,
.warning-box,
.did-you-know,
.challenge-box {
    margin: 22px 0;
    padding: 20px 23px;
    border-radius: 0 17px 17px 0;
}

.think-box {
    border-left: 5px solid var(--yellow-border);
    background: var(--yellow);
}

.key-idea {
    border-left: 5px solid var(--blue);
    background: #eaf3ff;
}

.tip-box {
    border-left: 5px solid #54a46a;
    background: var(--green);
}

.warning-box {
    border-left: 5px solid #d5648f;
    background: var(--pink);
}

.did-you-know {
    border-left: 5px solid #8367b2;
    background: var(--purple);
}

.challenge-box {
    border-left: 5px solid #815a20;
    background: #f9eddc;
}

.math-display {
    margin: 20px 0;
    padding: 17px;
    border: 1px solid var(--border);
    border-radius: 15px;
    color: var(--navy);
    background: #f8fbff;
    font-size: 1.18rem;
    font-weight: 800;
    text-align: center;
}

.visual-grid-two {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 20px;
    margin-top: 22px;
}

.visual-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 21px;
    background: #f9fbfd;
}

.visual-card h3 { margin-top: 0; }

.coordinate-diagram,
.travel-diagram,
.line-diagram {
    position: relative;
    width: min(100%, 480px);
    height: 310px;
    margin: 24px auto;
    border: 1px solid var(--border);
    border-radius: 22px;
    background:
        linear-gradient(#dde7f1 1px, transparent 1px),
        linear-gradient(90deg, #dde7f1 1px, transparent 1px),
        white;
    background-size: 35px 35px;
    overflow: hidden;
}

.axis-x,
.axis-y {
    position: absolute;
    z-index: 2;
    background: var(--navy);
}

.axis-x {
    left: 25px;
    right: 25px;
    top: 50%;
    height: 3px;
}

.axis-y {
    top: 25px;
    bottom: 25px;
    left: 50%;
    width: 3px;
}

.axis-label {
    position: absolute;
    z-index: 3;
    color: var(--navy);
    font-weight: 900;
}

.x-label { right: 12px; top: calc(50% - 24px); }
.y-label { left: calc(50% + 10px); top: 8px; }

.quadrant {
    position: absolute;
    color: #7c8b9d;
    font-size: .75rem;
    font-weight: 800;
}

.q1 { right: 52px; top: 42px; }
.q2 { left: 52px; top: 42px; }
.q3 { left: 52px; bottom: 42px; }
.q4 { right: 52px; bottom: 42px; }

.example-table {
    width: 100%;
    margin: 22px 0;
    border-collapse: collapse;
    overflow: hidden;
    border-radius: 14px;
}

.example-table th,
.example-table td {
    padding: 13px;
    border: 1px solid var(--border);
    text-align: center;
}

.example-table th {
    color: white;
    background: var(--navy);
}

.example-table tr:nth-child(even) td {
    background: #f5f8fc;
}

.worked-example {
    margin: 22px 0;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: #fbfcfe;
}

.worked-example h3 { margin-top: 0; }

.step {
    display: grid;
    grid-template-columns: 42px minmax(0,1fr);
    gap: 14px;
    margin-top: 16px;
    align-items: start;
}

.step-number {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border-radius: 50%;
    color: white;
    background: var(--navy);
    font-weight: 900;
}

.quick-check {
    display: grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 15px;
    margin-top: 20px;
}

.quick-card {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #f9fbfd;
}

.level-heading {
    display: inline-flex;
    margin: 22px 0 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--navy);
    background: var(--blue-light);
    font-size: .75rem;
    font-weight: 900;
}

.lesson-navigation {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-top: 34px;
}

.nav-button {
    display: flex;
    min-height: 52px;
    padding: 12px 18px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--navy);
    background: white;
    font-weight: 800;
    text-align: center;
}

.nav-button.primary {
    color: white;
    background: var(--navy);
}

.site-footer {
    padding: 34px 20px 24px;
    color: white;
    background: var(--navy);
    text-align: center;
}

.site-footer p { margin: 8px 0; font-size: .82rem; }

@media (max-width: 900px) {
    .lesson-hero { grid-template-columns: 1fr; }
    .visual-grid-two { grid-template-columns: 1fr; }
    .quick-check { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
    .site-header {
        padding: 18px 20px;
        align-items: flex-start;
        flex-direction: column;
    }

    .lesson-hero {
        padding: 45px 23px;
        text-align: center;
    }

    .lesson-meta { justify-content: center; }
    .lesson-section { padding: 28px 23px; }
    .lesson-navigation { grid-template-columns: 1fr; }
}
/* ======================================== */
/* VARIATION-SPECIFIC COMPONENTS            */
/* ======================================== */

.relationship-flow {
    display: grid;
    grid-template-columns: minmax(120px, 1fr) auto minmax(120px, 1fr);
    align-items: center;
    gap: 18px;
    margin: 24px 0;
}

.relationship-box {
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 19px;
    color: var(--navy);
    background: #f8fbff;
    font-size: 1.05rem;
    font-weight: 800;
    text-align: center;
}

.relationship-arrow {
    color: var(--blue);
    font-size: 2rem;
    font-weight: 900;
}

.ratio-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(80px, 1fr));
    gap: 12px;
    margin: 22px 0;
}

.ratio-strip div {
    padding: 17px 12px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #f9fbfd;
    text-align: center;
}

.ratio-strip strong {
    display: block;
    color: var(--navy);
    font-size: 1.1rem;
}

.recognition-box {
    margin: 22px 0;
    padding: 21px 24px;
    border-left: 5px solid #7b68b0;
    border-radius: 0 17px 17px 0;
    background: #eee8f8;
}

.recognition-box h3 {
    margin-top: 0;
    color: #5c4788;
}

.answers-section details {
    margin-top: 18px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #f9fbfd;
}

.answers-section summary {
    padding: 18px 22px;
    color: var(--navy);
    font-weight: 800;
    cursor: pointer;
    list-style-position: inside;
}

.answers-section summary:hover {
    background: #f1f6fc;
}

.answers-content {
    padding: 5px 24px 24px;
    border-top: 1px solid var(--border);
}

.answers-content h3 {
    margin-top: 22px;
}

.answers-content ol {
    padding-left: 24px;
}

.answers-content li {
    margin: 10px 0;
    color: var(--muted);
}

.answer-working {
    margin-top: 7px;
    padding: 10px 13px;
    border-radius: 12px;
    color: var(--text);
    background: white;
}

@media (max-width: 700px) {
    .relationship-flow {
        grid-template-columns: 1fr;
    }

    .relationship-arrow {
        transform: rotate(90deg);
        text-align: center;
    }

    .ratio-strip {
        grid-template-columns: repeat(2, minmax(80px, 1fr));
    }
}
/* ======================================== */
/* MONEY & FINANCE COMPONENTS               */
/* ======================================== */

.money-flow {
    display: grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 16px;
    margin: 24px 0;
}

.money-flow-card {
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: #fffdf7;
    text-align: center;
}

.money-flow-card strong {
    display: block;
    margin-bottom: 8px;
    color: var(--navy);
    font-size: 1.05rem;
}

.money-smart {
    margin: 22px 0;
    padding: 22px 24px;
    border-left: 5px solid #c89a28;
    border-radius: 0 17px 17px 0;
    background: #fff5d8;
}

.money-smart h3 {
    margin-top: 0;
    color: #765616;
}

.receipt-card {
    width: min(100%, 520px);
    margin: 24px auto;
    padding: 25px;
    border: 1px dashed #aab4bd;
    border-radius: 16px;
    background: #fff;
    font-family: "Courier New", monospace;
    box-shadow: var(--shadow);
}

.receipt-line {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 7px 0;
    border-bottom: 1px dotted #ccd2d8;
}

.receipt-total {
    margin-top: 10px;
    padding-top: 12px;
    border-top: 2px solid var(--navy);
    color: var(--navy);
    font-weight: 900;
}

.budget-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 18px;
    margin: 22px 0;
}

.budget-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: #f9fbfd;
}

.budget-card h3 {
    margin-top: 0;
}

.formula-family {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 14px;
    margin: 22px 0;
}

.formula-card {
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 17px;
    color: var(--navy);
    background: #fffdf7;
    font-weight: 800;
    text-align: center;
}

.answers-section details {
    margin-top: 18px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #f9fbfd;
}

.answers-section summary {
    padding: 18px 22px;
    color: var(--navy);
    font-weight: 800;
    cursor: pointer;
    list-style-position: inside;
}

.answers-section summary:hover {
    background: #f1f6fc;
}

.answers-content {
    padding: 5px 24px 24px;
    border-top: 1px solid var(--border);
}

.answers-content h3 {
    margin-top: 22px;
}

.answers-content ol {
    padding-left: 24px;
}

.answers-content li {
    margin: 10px 0;
    color: var(--muted);
}

.answer-working {
    margin-top: 7px;
    padding: 10px 13px;
    border-radius: 12px;
    color: var(--text);
    background: white;
}

@media (max-width: 760px) {
    .money-flow,
    .budget-grid,
    .formula-family {
        grid-template-columns: 1fr;
    }
}

/* ======================================== */
/* MONEY & FINANCE HERO ART                 */
/* Replaces the generic coordinate graph.   */
/* ======================================== */

.finance-hero-art {
    position: relative;
    width: min(100%, 350px);
    min-height: 285px;
    margin-inline: auto;
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 30px;
    background:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,.95), transparent 34%),
        linear-gradient(145deg, rgba(250,238,194,.9), rgba(222,241,232,.92));
    box-shadow: 0 22px 55px rgba(37, 66, 57, 0.13);
    overflow: hidden;
}

.finance-hero-art::before,
.finance-hero-art::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.55);
}

.finance-hero-art::before {
    width: 130px;
    height: 130px;
    top: -45px;
    right: -25px;
}

.finance-hero-art::after {
    width: 90px;
    height: 90px;
    bottom: -28px;
    left: -18px;
}

.finance-card {
    position: absolute;
    z-index: 3;
    top: 76px;
    left: 42px;
    width: 218px;
    padding: 20px;
    border-radius: 22px;
    color: white;
    background: linear-gradient(135deg, #315f52, #4d8b76);
    box-shadow: 0 18px 34px rgba(35, 78, 64, .24);
    transform: rotate(-5deg);
    animation: financeCardFloat 5.5s ease-in-out infinite;
}

.finance-card-top,
.finance-card-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.finance-chip {
    width: 36px;
    height: 27px;
    border-radius: 7px;
    background:
        linear-gradient(90deg, transparent 46%, rgba(91,73,25,.34) 47% 53%, transparent 54%),
        linear-gradient(0deg, transparent 46%, rgba(91,73,25,.34) 47% 53%, transparent 54%),
        #e8c86d;
}

.finance-contactless {
    font-family: Arial, sans-serif;
    font-size: .92rem;
    letter-spacing: -3px;
    opacity: .88;
    transform: rotate(90deg);
}

.finance-card-number {
    display: block;
    margin: 27px 0 16px;
    font-family: "Courier New", monospace;
    font-size: 1.08rem;
    letter-spacing: 2px;
}

.finance-card-bottom {
    font-size: .68rem;
    letter-spacing: 1px;
    opacity: .88;
}

.finance-badge {
    position: absolute;
    z-index: 5;
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    border: 1px solid rgba(255,255,255,.85);
    border-radius: 19px;
    color: #315f52;
    background: rgba(255,255,255,.9);
    box-shadow: 0 12px 26px rgba(49, 95, 82, .14);
    font-size: 1.5rem;
    font-weight: 900;
}

.finance-badge-percent {
    top: 29px;
    left: 36px;
    animation: financeBadgeFloat 4.2s ease-in-out infinite;
}

.finance-badge-up {
    top: 38px;
    right: 28px;
    color: #9a7220;
    animation: financeBadgeFloat 4.7s ease-in-out infinite reverse;
}

.finance-coin {
    position: absolute;
    z-index: 6;
    display: grid;
    place-items: center;
    border: 4px solid rgba(255,255,255,.7);
    border-radius: 50%;
    color: #70521a;
    background: linear-gradient(145deg, #f8df8b, #d8ad3e);
    box-shadow: 0 10px 20px rgba(122, 89, 24, .18);
    font-family: Georgia, serif;
    font-weight: 900;
}

.coin-one {
    right: 72px;
    bottom: 35px;
    width: 50px;
    height: 50px;
    animation: financeCoinOne 5s ease-in-out infinite;
}

.coin-two {
    right: 31px;
    bottom: 74px;
    width: 39px;
    height: 39px;
    font-size: .84rem;
    animation: financeCoinTwo 4.5s ease-in-out infinite;
}

.coin-three {
    left: 30px;
    bottom: 27px;
    width: 34px;
    height: 34px;
    font-size: .75rem;
    animation: financeCoinTwo 5.2s ease-in-out infinite reverse;
}

.finance-calculator {
    position: absolute;
    z-index: 4;
    right: 26px;
    bottom: 25px;
    display: grid;
    grid-template-columns: repeat(3, 13px);
    gap: 7px;
    width: 74px;
    padding: 11px;
    border-radius: 15px;
    background: #f8fbf9;
    box-shadow: 0 14px 28px rgba(49, 95, 82, .18);
    animation: financeCalculatorFloat 5.8s ease-in-out infinite;
}

.calculator-screen {
    grid-column: 1 / -1;
    overflow: hidden;
    padding: 7px 5px;
    border-radius: 7px;
    color: #315f52;
    background: #dfece7;
    font-family: "Courier New", monospace;
    font-size: .67rem;
    text-align: right;
}

.finance-calculator span {
    height: 13px;
    border-radius: 4px;
    background: #d9e3df;
}

.finance-calculator span:nth-of-type(3n) {
    background: #ead18a;
}

@keyframes financeCardFloat {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-8px) rotate(-3deg); }
}

@keyframes financeBadgeFloat {
    0%, 100% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-7px) rotate(4deg); }
}

@keyframes financeCoinOne {
    0%, 100% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-9px) rotate(12deg); }
}

@keyframes financeCoinTwo {
    0%, 100% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-6px) rotate(-10deg); }
}

@keyframes financeCalculatorFloat {
    0%, 100% { transform: translateY(0) rotate(3deg); }
    50% { transform: translateY(-5px) rotate(1deg); }
}

@media (prefers-reduced-motion: reduce) {
    .finance-card,
    .finance-badge,
    .finance-coin,
    .finance-calculator {
        animation: none;
    }
}

@media (max-width: 600px) {
    .finance-hero-art {
        min-height: 255px;
    }

    .finance-card {
        top: 73px;
        left: 30px;
        width: 190px;
    }

    .finance-calculator {
        right: 18px;
    }

    .finance-badge-up {
        right: 20px;
    }
}


/* ==================================================
   INTERACTIVE LABS — scoped additions only
   Existing StudyNest styling above is unchanged.
   ================================================== */
.interactive-lab {
    margin-top: 1.25rem;
    padding: 1.35rem;
    border: 1px solid #d9e6ef;
    border-radius: 18px;
    background: #f8fbfd;
}
.lab-grid,
.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}
.control-group label {
    display: block;
    margin-bottom: 0.45rem;
    font-weight: 700;
    color: #24445c;
}
.control-group input[type="range"],
.control-group input[type="number"],
.control-group select {
    width: 100%;
}
.control-group input[type="number"],
.control-group select {
    min-height: 42px;
    padding: 0.55rem 0.7rem;
    border: 1px solid #c9dce8;
    border-radius: 10px;
    background: #fff;
    color: #17364d;
}
.live-value {
    color: #0b7285;
}
.result-grid {
    margin-top: 1.15rem;
}
.result-card {
    padding: 1rem;
    border: 1px solid #d7e5ee;
    border-radius: 14px;
    background: #fff;
}
.result-card span {
    display: block;
    margin-bottom: 0.25rem;
    color: #587084;
    font-size: 0.9rem;
}
.result-card strong {
    display: block;
    color: #15384f;
    font-size: 1.35rem;
}
.lab-note {
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    border-left: 4px solid #0b7285;
    border-radius: 8px;
    background: #eef8fa;
    color: #24445c;
}
.graph-wrap {
    margin-top: 1.25rem;
    padding: 1rem;
    border: 1px solid #d7e5ee;
    border-radius: 14px;
    background: #fff;
}
.graph-wrap canvas {
    display: block;
    width: 100%;
    height: 280px;
}
.graph-key {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 0.7rem;
    color: #4e6578;
    font-size: 0.9rem;
}
.graph-key span::before {
    content: "";
    display: inline-block;
    width: 18px;
    height: 3px;
    margin-right: 0.4rem;
    vertical-align: middle;
    border-radius: 999px;
    background: #1769aa;
}
.graph-key span:nth-child(2)::before { background: #e07a2d; }
.graph-key span:nth-child(3)::before { background: #2f9e73; }
.budget-visual { margin-top: 1rem; }
.budget-bar {
    height: 14px;
    overflow: hidden;
    border-radius: 999px;
    background: #dfeaf0;
}
.budget-bar span {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: #2f9e73;
    transition: width .25s ease, background-color .25s ease;
}
.budget-feedback {
    margin: 0.75rem 0 0;
    font-weight: 700;
    color: #24445c;
}
@media (max-width: 640px) {
    .interactive-lab { padding: 1rem; }
    .graph-wrap canvas { height: 230px; }
}


/* Interactive money scales */
.control-group input[type="range"]{width:100%;accent-color:#1769aa;cursor:pointer}
.range-number-line{display:grid;grid-template-columns:repeat(5,1fr);gap:.25rem;margin-top:.35rem;font-size:.74rem;color:#64748b}
.range-number-line span:nth-child(2),.range-number-line span:nth-child(3),.range-number-line span:nth-child(4){text-align:center}
.range-number-line span:last-child{text-align:right}
.live-value{display:inline-block;min-width:3.3rem;padding:.08rem .35rem;border-radius:.35rem;background:#eef6ff;color:#125b96;font-weight:800;text-align:center}
.money-scale-visual{margin:1.2rem 0;padding:1rem;border:1px solid #d8e5f2;border-radius:14px;background:#fbfdff}
.money-scale-visual h3{margin:0 0 .85rem;font-size:1rem;color:#17324d}
.comparison-row{display:grid;grid-template-columns:minmax(90px,130px) 1fr minmax(76px,100px);align-items:center;gap:.7rem;margin:.65rem 0}
.comparison-row>span{font-size:.88rem;font-weight:700;color:#38516a}
.comparison-row>strong{text-align:right;color:#17324d}
.comparison-track{height:18px;border-radius:999px;background:repeating-linear-gradient(90deg,#e8f0f7 0,#e8f0f7 calc(25% - 1px),#c8d7e6 calc(25% - 1px),#c8d7e6 25%);overflow:hidden;border:1px solid #c9d9e8}
.comparison-track i{display:block;height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,#2c7ec0,#55a6df);transition:width .18s ease}
.comparison-row:nth-of-type(3) .comparison-track i{background:linear-gradient(90deg,#e18a38,#f0b45e)}
.comparison-row:nth-of-type(4) .comparison-track i{background:linear-gradient(90deg,#29956f,#55bb93)}
.scale-axis{display:grid;grid-template-columns:repeat(5,1fr);margin-left:calc(130px + .7rem);margin-right:calc(100px + .7rem);padding-top:.25rem;border-top:1px solid #9fb5c9;font-size:.7rem;color:#64748b}
.scale-axis span{text-align:center}.scale-axis span:first-child{text-align:left}.scale-axis span:last-child{text-align:right}
.difference-pointer{margin:.5rem 0 .2rem;padding:.55rem .75rem;border-radius:10px;background:#eef6ff;color:#17324d;font-weight:700;text-align:center}
@media(max-width:600px){.comparison-row{grid-template-columns:85px 1fr 72px;gap:.45rem}.scale-axis{margin-left:calc(85px + .45rem);margin-right:calc(72px + .45rem);font-size:.62rem}.money-scale-visual{padding:.8rem}.comparison-row>span{font-size:.78rem}}