:root {
    --primary-glow: #1f9f90;
    --primary-glow-soft: #2dc8b4;
    --bg-page: #f7faf9;
    --bg-surface: #ffffff;
    --text-primary: #152428;
    --text-secondary: #314247;
    --text-muted: #4a5c61;
    --link-color: #0b5852;
    --link-hover: #083f3b;
    --radius: 14px;
    --shadow: 0 10px 28px rgba(21, 36, 40, 0.08);
    --font: Verdana, Geneva, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg-page);
    color: var(--text-primary);
    font-family: var(--font);
    line-height: 1.55;
    min-height: 100%;
}

body { min-height: 100svh; }

a { color: var(--link-color); font-weight: 700; }
a:hover { color: var(--link-hover); }

.quiz-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(247, 250, 249, 0.94);
    border-bottom: 1px solid rgba(21, 36, 40, 0.08);
    backdrop-filter: blur(10px);
}

.quiz-header-inner {
    max-width: 860px;
    margin: 0 auto;
    padding: 0.7rem 1.1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.quiz-logo {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    color: inherit;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.quiz-logo img {
    width: 42px;
    height: 42px;
    display: block;
}

.quiz-logo span { color: var(--text-primary); }

.quiz-header-link {
    color: #fff !important;
    background: #0a0a0a;
    border-radius: 999px;
    padding: 0.4rem 0.9rem;
    text-decoration: none !important;
    font-size: 0.88rem;
}

.quiz-header-link:hover { background: #1a1a1a; color: #fff !important; }

.quiz-main {
    max-width: 760px;
    margin: 0 auto;
    padding: 1.25rem 1.1rem 3.5rem;
}

.quiz-hero {
    background: var(--bg-surface);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 1.4rem 1.3rem 1.5rem;
    margin-bottom: 1.1rem;
}

.quiz-invite {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.quiz-avatar {
    width: 84px;
    height: 84px;
    border-radius: 18px;
    object-fit: cover;
    flex-shrink: 0;
    box-shadow: 0 8px 18px rgba(21, 36, 40, 0.12);
}

.quiz-kicker {
    margin: 0 0 0.35rem;
    color: var(--primary-glow);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.quiz-hero h1 {
    margin: 0 0 0.55rem;
    font-size: clamp(1.25rem, 3.4vw, 1.85rem);
    line-height: 1.25;
    letter-spacing: -0.03em;
}

.quiz-hero p { margin: 0 0 0.7rem; color: var(--text-secondary); }
.quiz-hero p:last-child { margin-bottom: 0; }

.quiz-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 0.9rem;
}

.quiz-chip {
    background: rgba(45, 200, 180, 0.14);
    color: #0b5852;
    border-radius: 999px;
    padding: 0.22rem 0.7rem;
    font-size: 0.78rem;
    font-weight: 700;
}

.quiz-card {
    background: var(--bg-surface);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 1.25rem 1.2rem 1.4rem;
}

.quiz-card h2 {
    margin: 0 0 0.75rem;
    font-size: 1.05rem;
}

.quiz-field { margin-bottom: 0.85rem; }

.quiz-field label {
    display: block;
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.quiz-field input[type="text"] {
    width: 100%;
    border: 1px solid rgba(21, 36, 40, 0.14);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    font: inherit;
    color: var(--text-primary);
    background: #fff;
}

.quiz-field input[type="text"]:focus {
    outline: none;
    border-color: rgba(31, 159, 144, 0.55);
    box-shadow: 0 0 0 4px rgba(45, 200, 180, 0.16);
}

.quiz-hp {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.quiz-btn {
    appearance: none;
    border: 0;
    background: var(--primary-glow-soft);
    color: #041212;
    font: inherit;
    font-weight: 700;
    border-radius: 12px;
    padding: 0.85rem 1.15rem;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(45, 200, 180, 0.28);
}

.quiz-btn:hover { transform: translateY(-1px); }
.quiz-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.quiz-btn-ghost {
    background: transparent;
    box-shadow: none;
    color: var(--link-color);
    padding-left: 0.4rem;
    padding-right: 0.4rem;
}

.quiz-error {
    color: #8a1f1f;
    background: #fdecec;
    border-radius: 10px;
    padding: 0.65rem 0.8rem;
    margin: 0.5rem 0 0.8rem;
    font-size: 0.88rem;
}

.quiz-progress-wrap { margin-bottom: 0.9rem; }

.quiz-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
    color: var(--text-secondary);
}

.quiz-progress-bar {
    height: 8px;
    background: rgba(31, 159, 144, 0.15);
    border-radius: 999px;
    overflow: hidden;
}

.quiz-progress-bar > span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, #1f9f90, #2dc8b4);
    width: 0;
    transition: width 0.2s ease;
}

.quiz-question {
    margin: 0 0 0.9rem;
    font-size: 1.12rem;
    line-height: 1.35;
}

.quiz-choices {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin-bottom: 1rem;
}

.quiz-choice {
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    text-align: left;
    width: 100%;
    border: 1px solid rgba(21, 36, 40, 0.12);
    background: #fff;
    border-radius: 12px;
    padding: 0.8rem 0.9rem;
    font: inherit;
    cursor: pointer;
}

.quiz-choice:hover { border-color: rgba(31, 159, 144, 0.45); }

.quiz-choice.is-selected {
    border-color: #1f9f90;
    box-shadow: 0 0 0 3px rgba(45, 200, 180, 0.18);
    background: rgba(45, 200, 180, 0.08);
}

.quiz-choice-key {
    flex-shrink: 0;
    width: 1.55rem;
    height: 1.55rem;
    border-radius: 999px;
    background: #152428;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.05rem;
}

.quiz-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.quiz-score {
    text-align: center;
    padding: 0.4rem 0 0.8rem;
}

.quiz-score-num {
    font-size: clamp(2.4rem, 8vw, 3.6rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    color: #0b5852;
    line-height: 1;
}

.quiz-score-sub {
    color: var(--text-muted);
    margin-top: 0.25rem;
    font-size: 0.9rem;
}

.quiz-band-title {
    margin: 0.4rem 0 0.45rem;
    font-size: 1.35rem;
}

.quiz-band-text { color: var(--text-secondary); }

.quiz-cta {
    margin: 1.1rem 0;
    padding: 1rem 1.05rem;
    border-radius: 14px;
    background: rgba(45, 200, 180, 0.12);
}

.quiz-cta p { margin: 0 0 0.7rem; }
.quiz-cta .quiz-btn { display: inline-block; text-decoration: none; }

.quiz-table-wrap { overflow-x: auto; margin-top: 0.5rem; }

.quiz-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.quiz-table th,
.quiz-table td {
    text-align: left;
    padding: 0.55rem 0.45rem;
    border-bottom: 1px solid rgba(21, 36, 40, 0.08);
}

.quiz-table th { color: var(--text-muted); font-size: 0.75rem; }

.quiz-table tr.is-you td {
    background: rgba(45, 200, 180, 0.14);
    font-weight: 700;
}

.quiz-review { margin-top: 1.4rem; }

.quiz-review-item {
    border-top: 1px solid rgba(21, 36, 40, 0.08);
    padding: 0.85rem 0;
}

.quiz-review-q { margin: 0 0 0.35rem; font-weight: 700; }

.quiz-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: 999px;
    padding: 0.12rem 0.5rem;
    margin-left: 0.35rem;
}

.quiz-badge-ok { background: #d8f6ef; color: #0b5852; }
.quiz-badge-no { background: #fdecec; color: #8a1f1f; }

.quiz-review-explain {
    margin: 0.35rem 0 0;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.quiz-footer {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 1.1rem 2rem;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.quiz-footer nav { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-bottom: 0.4rem; }

.quiz-screen[hidden] { display: none !important; }

@media (max-width: 640px) {
    .quiz-invite { flex-direction: column; align-items: center; text-align: center; }
    .quiz-meta { justify-content: center; }
    .quiz-header-inner { padding: 0.6rem 0.85rem; }
    .quiz-logo span {
        font-size: 0.95rem;
        white-space: nowrap;
    }
    .quiz-header-link { padding: 0.38rem 0.75rem; font-size: 0.82rem; }
    .quiz-cta .quiz-btn { width: 100%; }
}