:root {
    --bg-top: #f7efe3;
    --bg-bottom: #eff3f8;
    --surface: rgba(255, 255, 255, 0.86);
    --surface-strong: rgba(255, 255, 255, 0.96);
    --text: #172234;
    --muted: #667389;
    --muted-strong: #49586f;
    --line: rgba(28, 36, 48, 0.1);
    --line-strong: rgba(28, 36, 48, 0.14);
    --primary: #233447;
    --primary-strong: #122131;
    --accent: #d8a13c;
    --accent-soft: #fff6e7;
    --success: #18734d;
    --success-soft: #edf8f2;
    --warning: #835e1b;
    --warning-soft: #fff6e9;
    --card-shadow: 0 24px 60px rgba(20, 36, 61, 0.08);
    --soft-shadow: 0 14px 34px rgba(20, 36, 61, 0.06);
}

* {
    box-sizing: border-box;
}

html {
    width: 100%;
    scroll-behavior: smooth;
}

body {
    position: relative;
    margin: 0;
    min-height: 100vh;
    overflow-x: hidden;
    font-family: "Aptos", "Segoe UI Variable Text", "Trebuchet MS", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(216, 161, 60, 0.18), transparent 22%),
        radial-gradient(circle at right 12% top 20%, rgba(35, 52, 71, 0.08), transparent 24%),
        linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 48%, #eef2f6 100%);
    color: var(--text);
}

body::before,
body::after {
    content: "";
    position: fixed;
    border-radius: 999px;
    pointer-events: none;
    filter: blur(12px);
    opacity: 0.6;
}

body::before {
    top: -80px;
    right: -30px;
    width: 220px;
    height: 220px;
    background: rgba(216, 161, 60, 0.18);
}

body::after {
    left: -60px;
    bottom: 18vh;
    width: 180px;
    height: 180px;
    background: rgba(68, 96, 129, 0.12);
}

.wrapper {
    position: relative;
    max-width: 1240px;
    margin: 0 auto;
    padding: 30px 30px 40px;
}

.hidden {
    display: none !important;
}

h1 {
    margin: 0 0 10px;
    font-family: "Aptos Display", "Segoe UI Variable Display", "Trebuchet MS", sans-serif;
    font-size: 40px;
    line-height: 0.96;
    letter-spacing: -0.04em;
}

.sub {
    margin: 0;
    color: var(--muted-strong);
    font-size: 16px;
    line-height: 1.6;
}

.note,
.counter-box,
.result-meta {
    padding: 14px 16px;
    border-radius: 18px;
    font-weight: 600;
}

.note {
    background: linear-gradient(135deg, var(--accent-soft), rgba(255, 255, 255, 0.92));
    border: 1px solid rgba(216, 161, 60, 0.2);
    color: var(--warning);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.88);
}

.counter-box {
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--warning-soft), rgba(255, 255, 255, 0.92));
    border: 1px solid rgba(131, 94, 27, 0.16);
    color: var(--warning);
}

#answer-counter {
    display: none;
}

.result-meta,
.meta-pill {
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(23, 34, 52, 0.08);
    color: var(--muted-strong);
}

.result-meta {
    margin-top: 12px;
}

input[type="text"] {
    width: 100%;
    min-height: 54px;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.96);
    color: var(--text);
    font-size: 16px;
    outline: none;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

input[type="text"]:focus {
    border-color: rgba(35, 52, 71, 0.28);
    box-shadow: 0 0 0 4px rgba(35, 52, 71, 0.08);
    transform: translateY(-1px);
}

button {
    width: 100%;
    min-height: 54px;
    padding: 14px 16px;
    border: none;
    border-radius: 16px;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

button:hover {
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-strong), var(--primary));
    color: #fff;
    box-shadow: 0 14px 30px rgba(18, 33, 49, 0.18);
}

.secondary-btn,
.answer-btn {
    background: rgba(255, 255, 255, 0.96);
    color: var(--text);
    border: 1px solid var(--line);
    box-shadow: var(--soft-shadow);
}

.answer-btn {
    margin-top: 18px;
    color: var(--warning);
    border-color: rgba(216, 161, 60, 0.28);
}

.start-shell {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 70px);
}

.start-card {
    width: min(100%, 860px);
    padding: 38px;
    border-radius: 34px;
    border: 1px solid rgba(255, 255, 255, 0.55);
    background:
        radial-gradient(circle at top right, rgba(216, 161, 60, 0.18), transparent 28%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 253, 0.92));
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.start-badge {
    margin-bottom: 18px;
}

.field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 20px 0;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-label {
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.variant-block {
    margin-top: 10px;
    padding: 18px;
    border-radius: 26px;
    border: 1px solid rgba(23, 34, 52, 0.08);
    background: rgba(255, 255, 255, 0.72);
}

.variant-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 14px;
}

.variant-title {
    font-size: 22px;
    font-weight: 900;
    letter-spacing: -0.03em;
}

.variant-hint {
    max-width: 340px;
    color: var(--muted);
    font-size: 14px;
    text-align: right;
    line-height: 1.45;
}

.variant-picker {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.variant-option {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    min-height: 124px;
    padding: 18px;
    border: 1px solid rgba(23, 34, 52, 0.08);
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 247, 251, 0.92));
    color: var(--text);
    box-shadow: var(--soft-shadow);
}

.variant-option.selected {
    border-color: rgba(216, 161, 60, 0.35);
    background: linear-gradient(180deg, #fffdf8, #fbf1dc);
    box-shadow: 0 0 0 4px rgba(216, 161, 60, 0.12), 0 18px 36px rgba(20, 36, 61, 0.08);
}

.variant-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary-strong), var(--primary));
    color: #fff;
    font-size: 18px;
    font-weight: 900;
}

.variant-option.selected .variant-num {
    background: linear-gradient(135deg, #c88414, #efc56d);
    color: #312206;
}

.variant-copy {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    text-align: left;
}

.variant-copy strong {
    font-size: 18px;
    line-height: 1.1;
}

.variant-copy span {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.4;
}

.start-actions {
    margin-top: 20px;
}

.stage-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.meta-pill {
    padding: 10px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.question-layout {
    display: grid;
    grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
    gap: 22px;
    align-items: start;
}

.question-panel,
.answer-panel {
    min-width: 0;
    padding: 24px;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.97), rgba(247, 250, 253, 0.92));
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.section-kicker {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.question-main {
    color: var(--text);
    font-size: 33px;
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.question-main::after {
    content: "";
    display: block;
    width: 92px;
    height: 4px;
    margin-top: 18px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), rgba(216, 161, 60, 0.12));
}

.q-title {
    display: block;
    font-size: inherit;
    line-height: inherit;
    font-weight: 700;
}

.rich-content {
    display: inline;
}

.rich-content.has-formula,
.rich-content.formula-only {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
    overflow-wrap: anywhere;
}

.rich-content.has-formula {
    justify-content: flex-start;
    width: auto;
}

.rich-content.formula-only {
    justify-content: center;
    width: 100%;
}

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

.opt {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 112px;
    margin: 0;
    padding: 20px 18px;
    border: 1px solid rgba(23, 34, 52, 0.08);
    border-radius: 22px;
    background: linear-gradient(180deg, #ffffff, #f5f8fb);
    box-shadow: var(--soft-shadow);
    cursor: pointer;
    text-align: center;
    line-height: 1.4;
}

.opt:hover {
    border-color: rgba(216, 161, 60, 0.24);
    background: linear-gradient(180deg, #fffefb, #fbf3e3);
}

.opt.selected {
    border-color: rgba(216, 161, 60, 0.36);
    background: linear-gradient(180deg, #fffefb, #f8eed9);
    box-shadow: 0 0 0 4px rgba(216, 161, 60, 0.1), 0 18px 34px rgba(20, 36, 61, 0.08);
}

.opt input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.opt-content,
.opt .rich-content,
.opt .rich-content.has-formula,
.opt .rich-content.formula-only {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 56px;
    flex-wrap: wrap;
    gap: 10px 12px;
    word-break: break-word;
}

.answer-box {
    margin-top: 14px;
    padding: 15px 16px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--success-soft), rgba(255, 255, 255, 0.96));
    border: 1px solid rgba(24, 115, 77, 0.14);
    color: var(--success);
    line-height: 1.45;
}

.formula-img {
    display: block;
    flex: 0 0 auto;
    width: auto;
    max-width: min(100%, 220px);
    height: auto;
    object-fit: contain;
}

.question-main .rich-content.has-formula .formula-img {
    max-width: min(100%, 290px);
}

.question-main .rich-content.formula-only .formula-img {
    max-width: min(100%, 340px);
}

.opt .rich-content.has-formula .formula-img {
    max-width: min(100%, 200px);
}

.opt .rich-content.formula-only .formula-img {
    max-width: 92%;
}

.status-badge {
    display: inline-block;
    margin-bottom: 10px;
    padding: 9px 14px;
    border-radius: 999px;
    background: var(--success-soft);
    color: var(--success);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.result-screen {
    display: flex;
    justify-content: center;
    padding-top: 40px;
}

.result-card {
    width: min(100%, 560px);
    padding: 34px 26px;
    text-align: center;
    border-radius: 30px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(246, 250, 248, 0.94));
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--card-shadow);
}

.result-sub {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

.score-big {
    margin: 8px 0;
    font-size: 84px;
    color: var(--success);
}

.result-points {
    margin: 0;
    font-weight: 800;
}

.nav-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 20px;
}

.nav-grid.single {
    grid-template-columns: 1fr;
}

.question-jump {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 1000;
    width: 160px;
    max-height: calc(100vh - 36px);
    overflow: auto;
    padding: 12px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid rgba(255, 255, 255, 0.55);
    box-shadow: var(--soft-shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.question-jump-title {
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.question-jump-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.question-jump-btn {
    width: 100%;
    min-width: 0;
    min-height: 38px;
    padding: 8px 0;
    border-radius: 12px;
    border: 1px solid rgba(23, 34, 52, 0.08);
    background: rgba(255, 255, 255, 0.96);
    color: var(--text);
    font-size: 12px;
    font-weight: 800;
}

.question-jump-btn.answered {
    background: #eef5fc;
    color: var(--primary);
    border-color: rgba(35, 52, 71, 0.14);
}

.question-jump-btn.current {
    background: linear-gradient(135deg, #c88414, #efc56d);
    color: #312206;
    border-color: rgba(216, 161, 60, 0.35);
}

@media (max-width: 980px) {
    .wrapper {
        padding: 22px 18px 30px;
    }

    .start-card {
        padding: 30px 24px;
    }

    .variant-picker {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .question-layout {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .question-panel,
    .answer-panel {
        padding: 22px;
        border-radius: 26px;
    }

    .question-main {
        font-size: 28px;
    }
}

@media (max-width: 640px) {
    body::before,
    body::after {
        display: none;
    }

    .wrapper {
        padding: 14px 12px 94px;
    }

    h1 {
        font-size: 32px;
    }

    .sub {
        font-size: 15px;
    }

    .start-shell {
        min-height: auto;
    }

    .start-card {
        padding: 24px 18px;
        border-radius: 28px;
    }

    .field-grid,
    .answer-grid,
    .nav-grid {
        grid-template-columns: 1fr;
    }

    .variant-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .variant-hint {
        max-width: none;
        text-align: left;
    }

    .variant-picker {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .variant-option {
        min-height: 104px;
        padding: 14px;
        border-radius: 20px;
    }

    .variant-copy strong {
        font-size: 16px;
    }

    .variant-copy span {
        font-size: 12px;
    }

    .stage-meta {
        position: sticky;
        top: 72px;
        z-index: 20;
        margin-bottom: 14px;
        padding-right: 0;
    }

    .meta-pill {
        font-size: 12px;
    }

    .question-panel,
    .answer-panel {
        padding: 18px;
        border-radius: 24px;
    }

    .question-main {
        font-size: 22px;
        line-height: 1.14;
    }

    .question-main::after {
        width: 72px;
        margin-top: 14px;
    }

    .opt {
        min-height: 82px;
        padding: 14px 12px;
        border-radius: 18px;
    }

    .answer-btn,
    .primary-btn,
    .secondary-btn {
        min-height: 52px;
    }

    .formula-img {
        max-width: min(100%, 160px);
    }

    .question-main .rich-content.has-formula .formula-img {
        max-width: min(100%, 190px);
    }

    .question-main .rich-content.formula-only .formula-img {
        max-width: min(100%, 220px);
    }

    .opt .rich-content.has-formula .formula-img,
    .opt .rich-content.formula-only .formula-img {
        max-width: min(100%, 170px);
    }

    .question-jump {
        top: 10px;
        left: 12px;
        right: 12px;
        width: auto;
        max-height: none;
        overflow-x: auto;
        overflow-y: hidden;
        padding: 10px;
        border-radius: 18px;
    }

    .question-jump-title {
        display: none;
    }

    .question-jump-grid {
        display: flex;
        flex-wrap: nowrap;
        gap: 8px;
    }

    .question-jump-btn {
        flex: 0 0 40px;
        min-width: 40px;
        min-height: 40px;
        border-radius: 12px;
        font-size: 12px;
    }

    .score-big {
        font-size: 64px;
    }

    .result-card {
        padding: 28px 18px;
        border-radius: 24px;
    }
}