:root {
    --bg-top: #fff4e1;
    --bg-bottom: #f6f8ff;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-strong: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: rgba(148, 163, 184, 0.35);
    --accent: #ef7d32;
    --accent-dark: #cf6119;
    --shadow: 0 24px 60px rgba(31, 41, 55, 0.12);
    --selected: #dbeafe;
    --correct: #dcfce7;
    --incorrect: #fee2e2;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.85), transparent 30%),
        linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
    color: var(--text);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.page-shell {
    min-height: 100vh;
    padding: 16px 20px 112px;
    display: flex;
    justify-content: center;
    align-items: start;
}

.quiz-container {
    width: min(96vw, 1380px);
    display: grid;
    gap: 10px;
}

.quiz-header {
    text-align: center;
    display: grid;
    gap: 8px;
}

.eyebrow {
    margin: 0;
    color: var(--accent-dark);
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.75rem;
    font-weight: 700;
}

.page-instruction {
    margin: 0;
    font-size: 1.2rem;
    line-height: 1.45;
    font-weight: 600;
}

.quiz-card {
    display: grid;
    grid-template-columns: minmax(620px, 2fr) minmax(320px, 1fr);
    align-items: stretch;
    gap: 18px;
    padding: clamp(14px, 1.4vw, 18px);
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 26px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
}

.image-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: clamp(400px, 44vw, 620px);
    padding: clamp(8px, 1vw, 12px);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(247, 248, 252, 0.88));
    border: 1px solid var(--line);
    border-radius: 24px;
    overflow: hidden;
}

.image-stage {
    width: min(100%, 560px);
    height: clamp(280px, 34vw, 420px);
    display: flex;
    align-items: center;
    justify-content: center;
}

img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 18px;
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.14);
    image-rendering: auto;
}

.quiz-side {
    display: grid;
    align-content: center;
    gap: 18px;
    min-width: 0;
}

.quiz-meta {
    display: grid;
    gap: 6px;
    text-align: left;
}

#imageFilename {
    min-height: 1.6em;
    margin: 0;
    color: var(--accent-dark);
    font-size: 1.08rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    visibility: hidden;
}

#optionsList {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin: 0;
    padding: 0;
    list-style: none;
    align-content: start;
}

#optionsList li {
    min-width: 0;
}

.option {
    width: 100%;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-strong);
    color: var(--text);
    font: inherit;
    font-size: 1.05rem;
    font-weight: 600;
    text-align: center;
    word-break: break-word;
    overflow-wrap: anywhere;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.option:hover {
    transform: translateY(-1px);
    border-color: rgba(239, 125, 50, 0.45);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.option:focus-visible {
    outline: 3px solid rgba(239, 125, 50, 0.3);
    outline-offset: 2px;
}

.option.is-selected {
    background: var(--selected);
    border-color: #60a5fa;
}

.option.is-correct {
    background: var(--correct);
    border-color: #4ade80;
}

.option.is-incorrect {
    background: var(--incorrect);
    border-color: #f87171;
}

.action-bar {
    display: flex;
    justify-content: center;
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    z-index: 10;
    pointer-events: none;
}

#nextImageButton {
    min-width: min(100%, 260px);
    padding: 15px 28px;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #f59e0b);
    color: #fff;
    font: inherit;
    font-size: 1.08rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 18px 32px rgba(239, 125, 50, 0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    pointer-events: auto;
}

#nextImageButton:hover {
    transform: translateY(-1px);
    box-shadow: 0 20px 36px rgba(239, 125, 50, 0.34);
}

#nextImageButton:focus-visible {
    outline: 3px solid rgba(239, 125, 50, 0.28);
    outline-offset: 3px;
}

@media (max-width: 640px) {
    .page-shell {
        padding: 18px 14px 22px;
        align-items: start;
    }

    .quiz-container {
        gap: 16px;
    }

    .quiz-card {
        grid-template-columns: 1fr;
        gap: 18px;
        padding: 16px;
        border-radius: 22px;
    }

    .image-container {
        min-height: 220px;
        border-radius: 18px;
    }

    .image-stage {
        width: min(100%, 380px);
        height: min(42vh, 280px);
    }

    img {
        width: 100%;
        height: 100%;
    }

    .quiz-side {
        gap: 16px;
    }

    .quiz-meta {
        text-align: center;
    }

    .page-instruction {
        font-size: 1.05rem;
    }

    #optionsList {
        grid-template-columns: 1fr;
    }

    .option {
        padding: 13px 14px;
        font-size: 0.96rem;
    }

    #nextImageButton {
        width: 100%;
    }
}

@media (max-height: 860px) and (min-width: 641px) {
    .page-shell {
        padding: 10px 18px 8px;
    }

    .quiz-container {
        gap: 8px;
    }

    .page-instruction {
        font-size: 1.08rem;
    }

    .quiz-card {
        gap: 14px;
        padding: 14px;
    }

    .image-container {
        min-height: 340px;
    }

    .image-stage {
        width: min(100%, 500px);
        height: clamp(260px, 30vw, 360px);
    }

    .quiz-side {
        gap: 14px;
    }

    #optionsList {
        gap: 10px;
    }

    .option {
        padding: 13px 14px;
        font-size: 0.98rem;
    }

    #nextImageButton {
        padding: 12px 22px;
        font-size: 1rem;
    }
}