/* =========================================================
   CARBON WORLD
   ========================================================= */

.carbon-quiz-layout {
    width: 100%;
    padding: 32px 42px 48px;
    box-sizing: border-box;
    color: #f5f5f5;
}


/* =========================================================
   HEADER
   ========================================================= */

.carbon-quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 24px;

    margin-bottom: 28px;
}


.carbon-quiz-header > div {
    min-width: 0;
}


.carbon-quiz-eyebrow {
    margin-bottom: 8px;

    color: #e6a25b;

    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.18em;
}


.carbon-quiz-header h1 {
    margin: 0;

    font-size: clamp(2rem, 3vw, 3.4rem);
    line-height: 1.05;
}


.carbon-quiz-header p {
    max-width: 760px;

    margin: 14px 0 0;

    color: rgba(255, 255, 255, 0.66);

    font-size: 1rem;
    line-height: 1.6;
}


#resetCarbonQuizBtn {
    flex: 0 0 auto;
}


/* =========================================================
   THREE-COLUMN PAGE
   ========================================================= */

.carbon-quiz-main {
    display: grid;

    grid-template-columns:
        minmax(190px, 230px)
        minmax(0, 1fr)
        minmax(220px, 280px);

    gap: 22px;
    align-items: stretch;
}


/* =========================================================
   LEFT DISCOVERY PANEL
   ========================================================= */

.carbon-mission-panel {
    min-width: 0;
    padding: 22px 18px;

    border-radius: 20px;

    border:
        1px solid rgba(255, 255, 255, 0.08);

    background:
        rgba(8, 8, 8, 0.5);
}


.carbon-mission-panel h2 {
    margin: 0 0 18px;

    font-size: 1.15rem;
}


#carbonDiscoveryList {
    display: flex;
    flex-direction: column;
    gap: 5px;
}


.carbon-discovery {
    display: flex;
    align-items: center;
    gap: 10px;

    min-height: 42px;

    padding: 9px 10px;

    border-radius: 12px;

    font-size: 0.9rem;

    transition:
        opacity 0.2s ease,
        background 0.2s ease;
}


.carbon-discovery > span:first-child {
    width: 20px;
    flex: 0 0 20px;

    text-align: center;

    font-weight: 800;
}


.carbon-discovery.locked {
    opacity: 0.3;
}


.carbon-discovery.unlocked {
    opacity: 1;

    background:
        rgba(230, 146, 60, 0.12);

    border:
        1px solid rgba(230, 146, 60, 0.2);
}


/* =========================================================
   MAIN MISSION STAGE
   ========================================================= */

.carbon-quiz-stage {
    min-width: 0;
    min-height: 560px;

    padding: 30px 34px;

    border-radius: 24px;

    border:
        1px solid rgba(255, 255, 255, 0.08);

    background:
        radial-gradient(
            circle at 50% 55%,
            rgba(219, 112, 28, 0.08),
            transparent 55%
        ),
        rgba(10, 10, 10, 0.78);
}


.carbon-mission-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;

    padding-bottom: 18px;
    margin-bottom: 24px;

    border-bottom:
        1px solid rgba(255, 255, 255, 0.07);

    color:
        rgba(255, 255, 255, 0.58);

    font-size: 0.82rem;
    font-weight: 700;
}


#carbonQuizScore {
    color: #e6a25b;
}


/* =========================================================
   QUESTION
   ========================================================= */

.carbon-question-card {
    width: 100%;
}


.carbon-mission-label {
    margin-bottom: 20px;

    color: #e6a25b;

    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}


.carbon-question-card h2 {
    max-width: 850px;

    margin: 26px 0 0;

    font-size: clamp(1.3rem, 1.8vw, 1.8rem);
    line-height: 1.35;
}


/* =========================================================
   CARBON ATOM PREVIEW
   ========================================================= */

.carbon-atom-preview {
    display: flex;
    align-items: center;
    gap: 24px;

    width: fit-content;

    padding: 16px 20px;

    border-radius: 18px;

    background:
        rgba(255, 255, 255, 0.035);

    border:
        1px solid rgba(255, 255, 255, 0.07);
}


.carbon-element-tile {
    position: relative;

    width: 105px;
    height: 105px;

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

    border-radius: 18px;

    border:
        1px solid rgba(230, 162, 91, 0.55);

    background:
        linear-gradient(
            145deg,
            rgba(230, 162, 91, 0.15),
            rgba(255, 255, 255, 0.025)
        );
}


.carbon-element-tile .carbon-number {
    position: absolute;

    top: 9px;
    left: 11px;

    color:
        rgba(255, 255, 255, 0.65);

    font-size: 0.75rem;
}


.carbon-element-tile strong {
    font-size: 2.5rem;
    line-height: 1;
}


.carbon-element-tile > span:last-child {
    margin-top: 7px;

    color:
        rgba(255, 255, 255, 0.65);

    font-size: 0.72rem;
}


.carbon-electron-config {
    display: flex;
    flex-direction: column;
    gap: 5px;

    color:
        rgba(255, 255, 255, 0.58);

    font-size: 0.8rem;
}


.carbon-electron-config strong {
    color: white;

    font-size: 1.55rem;
}


/* =========================================================
   ANSWERS
   ========================================================= */

.carbon-answer-grid {
    display: grid;

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

    gap: 12px;

    margin-top: 26px;
}


.carbon-answer-btn {
    min-height: 78px;

    padding: 16px 18px;

    border-radius: 16px;

    border:
        1px solid rgba(255, 255, 255, 0.12);

    background:
        rgba(255, 255, 255, 0.045);

    color: white;

    font: inherit;
    font-weight: 600;

    cursor: pointer;

    transition:
        transform 0.2s ease,
        border-color 0.2s ease,
        background 0.2s ease;
}


.carbon-answer-btn:hover {
    transform: translateY(-2px);

    border-color:
        rgba(230, 162, 91, 0.5);

    background:
        rgba(230, 146, 60, 0.1);
}


.carbon-answer-btn:disabled {
    cursor: default;
    opacity: 0.55;
    transform: none;
}

/* Correct completed answer */
.carbon-answer-btn.correct-answer,
.carbon-answer-btn.correct-answer:disabled {
    opacity: 1;

    border-color:
        rgba(84, 180, 104, 0.65);

    background:
        rgba(84, 180, 104, 0.16);

    color:
        #ffffff;

    box-shadow:
        inset 0 0 0 1px
        rgba(84, 180, 104, 0.12);
}


/* Add a check mark */
.carbon-answer-btn.correct-answer::after {
    content: "✓";

    margin-left: 10px;

    color:
        rgb(110, 210, 125);

    font-weight: 900;
}


/* Wrong attempt */
.carbon-answer-btn.wrong-answer {
    border-color:
        rgba(210, 90, 70, 0.55);

    background:
        rgba(210, 90, 70, 0.10);
}
/* =========================================================
   QUESTION FEEDBACK
   ========================================================= */

.carbon-question-feedback {
    min-height: 48px;

    margin-top: 18px;
    padding: 0;

    font-size: 0.9rem;
    line-height: 1.5;
}


.carbon-question-feedback.correct,
.carbon-question-feedback.incorrect {
    padding: 12px 15px;

    border-radius: 12px;
}


.carbon-question-feedback.correct {
    background:
        rgba(84, 180, 104, 0.1);

    border:
        1px solid rgba(84, 180, 104, 0.28);
}


.carbon-question-feedback.incorrect {
    background:
        rgba(210, 90, 70, 0.1);

    border:
        1px solid rgba(210, 90, 70, 0.26);
}


/* =========================================================
   RIGHT EXPLANATION PANEL
   ========================================================= */

.carbon-info-panel {
    min-width: 0;

    padding: 22px 20px;

    border-radius: 20px;

    border:
        1px solid rgba(255, 255, 255, 0.08);

    background:
        rgba(8, 8, 8, 0.5);
}


.carbon-info-panel h2 {
    margin: 0 0 18px;

    font-size: 1.15rem;
    line-height: 1.25;
}


#carbonExplanation {
    color:
        rgba(255, 255, 255, 0.62);

    font-size: 0.9rem;
    line-height: 1.6;
}


/* =========================================================
   DISCOVERY UNLOCK
   ========================================================= */

.carbon-discovery-unlocked {
    padding: 15px;

    border-radius: 16px;

    border:
        1px solid rgba(230, 162, 91, 0.25);

    background:
        rgba(230, 146, 60, 0.08);
}


.carbon-discovery-unlocked > span {
    display: block;

    margin-bottom: 8px;

    color: #e6a25b;

    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.13em;
}


.carbon-discovery-unlocked > strong {
    display: block;

    margin-bottom: 10px;

    color: white;

    font-size: 1.05rem;
}


.carbon-discovery-unlocked p {
    margin: 0;

    color:
        rgba(255, 255, 255, 0.66);

    line-height: 1.6;
}


/* =========================================================
   CARBON CHAIN BUILDER
   ========================================================= */

.carbon-builder-workspace {
    min-height: 240px;

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

    margin: 28px 0;

    padding: 20px;

    border-radius: 20px;

    border:
        1px dashed rgba(255, 255, 255, 0.15);

    background:
        rgba(0, 0, 0, 0.18);
}


.carbon-chain-display {
    display: flex;
    justify-content: center;
    align-items: center;

    flex-wrap: wrap;

    gap: 10px;
}


.carbon-chain-atom {
    width: 68px;
    height: 68px;

    display: inline-flex;
    justify-content: center;
    align-items: center;

    flex: 0 0 68px;

    border-radius: 50%;

    border:
        2px solid rgba(230, 162, 91, 0.75);

    background:
        radial-gradient(
            circle at 35% 30%,
            rgba(255, 255, 255, 0.13),
            rgba(230, 125, 40, 0.12)
        );

    font-size: 1.6rem;
    font-weight: 800;
}


.carbon-chain-bond {
    color:
        rgba(255, 255, 255, 0.7);

    font-size: 2rem;
}


.carbon-builder-controls {
    display: flex;
    justify-content: center;
    align-items: center;

    flex-wrap: wrap;

    gap: 18px;
}


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

.carbon-quiz-navigation {
    display: flex;
    justify-content: center;
    gap: 12px;

    margin-top: 22px;
}


.carbon-quiz-navigation button:disabled {
    opacity: 0.35;
    cursor: default;
}

/* =========================================================
   CARBON BOND DRAWING MISSION
   ========================================================= */

.carbon-challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;

    margin-top: 28px;
}


.carbon-challenge-header h3 {
    margin: 5px 0 6px;

    font-size: 1.2rem;
}


.carbon-challenge-header p {
    margin: 0;

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

    line-height: 1.5;
}


#carbonStructureChallengeNumber {
    color: #e6a25b;

    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}


.carbon-bond-workspace {
    position: relative;

    height: 330px;

    margin-top: 22px;

    overflow: hidden;

    border-radius: 20px;

    border:
        1px dashed
        rgba(255,255,255,0.16);

    background:
        radial-gradient(
            circle at center,
            rgba(230,146,60,0.05),
            transparent 65%
        ),
        rgba(0,0,0,0.2);
}


.carbon-bond-svg,
.carbon-bond-atoms {
    position: absolute;
    inset: 0;

    width: 100%;
    height: 100%;
}


.carbon-bond-svg {
    pointer-events: none;

    overflow: visible;
}


.carbon-connect-atom {
    position: absolute;

    width: 72px;
    height: 72px;

    transform:
        translate(-50%, -50%);

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

    border-radius: 50%;

    border:
        2px solid
        rgba(230,162,91,0.8);

    background:
        radial-gradient(
            circle at 35% 30%,
            rgba(255,255,255,0.14),
            rgba(230,125,40,0.13)
        );

    color: white;

    font-size: 1.55rem;
    font-weight: 800;

    cursor: crosshair;

    user-select: none;

    touch-action: none;

    z-index: 2;
}


.carbon-connect-atom:hover {
    border-color:
        rgba(255,190,115,1);

    background:
        rgba(230,146,60,0.18);
}


.carbon-drawn-bond {
    stroke:
        rgba(255,255,255,0.75);

    stroke-width: 4;

    stroke-linecap: round;
}


.carbon-temp-bond {
    stroke:
        rgba(230,162,91,0.65);

    stroke-width: 3;

    stroke-linecap: round;

    stroke-dasharray: 7 6;
}


.carbon-structure-progress {
    display: flex;
    justify-content: center;
    align-items: center;

    gap: 10px;

    margin-top: 18px;
}


.carbon-structure-progress span {
    width: 34px;
    height: 34px;

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

    border-radius: 50%;

    border:
        1px solid
        rgba(255,255,255,0.12);

    color:
        rgba(255,255,255,0.35);

    font-size: 0.8rem;
    font-weight: 700;
}


.carbon-structure-progress span.active {
    border-color:
        rgba(230,162,91,0.7);

    color: white;

    background:
        rgba(230,146,60,0.12);
}


.carbon-structure-progress span.complete {
    border-color:
        rgba(84,180,104,0.55);

    color:
        rgb(110,210,125);

    background:
        rgba(84,180,104,0.1);
}


/* =========================================================
   ISOMERS
   ========================================================= */

.carbon-isomer-example {
    margin: 28px 0;
}


.carbon-isomer-card {
    padding: 22px;

    border-radius: 18px;

    border:
        1px dashed rgba(255,255,255,0.14);

    text-align: center;
}


.carbon-isomer-card > span {
    display: block;

    margin-bottom: 18px;

    color:
        rgba(255,255,255,0.5);

    font-size: 0.8rem;
}


.carbon-isomer-diagram,
.carbon-mini-structure {
    font-family: monospace;
    font-size: 1.25rem;
    line-height: 1.45;
}


/* =========================================================
   FUNCTIONAL GROUP
   ========================================================= */

.carbon-functional-display {
    min-height: 160px;

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

    margin: 25px 0;

    border-radius: 18px;

    border:
        1px dashed rgba(255,255,255,0.14);
}


.carbon-functional-molecule {
    font-family: monospace;

    font-size: 2rem;

    font-weight: 700;
}


/* =========================================================
   ALLOTROPES
   ========================================================= */

.carbon-allotrope-preview {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));

    gap: 14px;

    margin: 28px 0;
}


.carbon-allotrope-card {
    min-height: 180px;

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

    gap: 14px;

    padding: 20px;

    border-radius: 18px;

    border:
        1px solid rgba(255,255,255,0.09);

    background:
        rgba(255,255,255,0.025);

    text-align: center;
}


.carbon-allotrope-symbol {
    font-size: 2.5rem;

    color: #e6a25b;
}


.carbon-allotrope-card span {
    color:
        rgba(255,255,255,0.58);
}


/* =========================================================
   FINAL MISSION
   ========================================================= */

.carbon-final-chain {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;

    gap: 10px;

    margin: 32px 0;
}


.carbon-final-term {
    padding: 11px 14px;

    border-radius: 12px;

    background:
        rgba(255,255,255,0.045);

    border:
        1px solid rgba(255,255,255,0.09);

    color: white;

    font: inherit;

    cursor: pointer;

    transition:
        transform 0.2s ease,
        border-color 0.2s ease,
        background 0.2s ease;
}


.carbon-final-term:hover {
    transform: translateY(-2px);

    border-color:
        rgba(230,162,91,0.65);

    background:
        rgba(230,146,60,0.12);
}


.carbon-final-chain > span {
    color: #e6a25b;

    font-weight: 800;
}


.carbon-final-result {
    display: flex;
    flex-direction: column;
    align-items: center;

    gap: 14px;

    margin: 30px 0;

    font-size: 1.5rem;
}


.carbon-final-result strong {
    color: #e6a25b;

    font-size: 1.45rem;
    letter-spacing: 0.08em;
}


.carbon-final-mission {
    text-align: center;
}


@media (max-width: 760px) {

    .carbon-structure-grid,
    .carbon-allotrope-preview {
        grid-template-columns: 1fr;
    }
}
/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 1100px) {

    .carbon-quiz-main {
        grid-template-columns:
            190px minmax(0, 1fr);
    }

    .carbon-info-panel {
        grid-column: 1 / -1;
    }
}


@media (max-width: 760px) {

    .carbon-quiz-layout {
        padding: 24px 16px 40px;
    }

    .carbon-quiz-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .carbon-quiz-main {
        grid-template-columns: 1fr;
    }

    .carbon-mission-panel,
    .carbon-info-panel {
        grid-column: auto;
    }

    .carbon-quiz-stage {
        padding: 22px 18px;
    }

    .carbon-answer-grid {
        grid-template-columns: 1fr;
    }

    .carbon-atom-preview {
        width: 100%;
        box-sizing: border-box;
    }
}