* { margin: 0; padding: 0; box-sizing: border-box; }

/* Dark mode (default) */
:root {
    --bg-main: #1a1a2e;
    --bg-card: #16213e;
    --bg-button: #0f3460;
    --bg-button-hover: #533483;
    --bg-pick: #533483;
    --bg-pick-hover: #6b44a0;
    --border-card: #0f3460;
    --text-main: #e0e0e0;
    --text-heading: #a0c4ff;
    --text-muted: #7b8fa1;
    --text-hint: #556677;
    --text-done: #ffc107;
    --text-strong: #a0c4ff;
}

/* Light mode */
body.light {
    --bg-main: #f5f5f5;
    --bg-card: #ffffff;
    --bg-button: #e0e0e0;
    --bg-button-hover: #7c3aed;
    --bg-pick: #7c3aed;
    --bg-pick-hover: #6d28d9;
    --border-card: #d0d0d0;
    --text-main: #1a1a1a;
    --text-heading: #4a4a8a;
    --text-muted: #666666;
    --text-hint: #888888;
    --text-done: #b8860b;
    --text-strong: #4a4a8a;
}

body {
    font-family: 'Georgia', serif;
    background: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    transition: background 0.3s, color 0.3s;
}

h1 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-heading);
    text-align: center;
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 2rem;
}

select, button {
    font-size: 1.2rem;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
}

select {
    background: var(--bg-card);
    color: var(--text-main);
    border: 2px solid var(--border-card);
}

button {
    background: var(--bg-button);
    color: var(--text-main);
    transition: background 0.2s, color 0.2s;
}

button:hover:not(:disabled) {
    background: var(--bg-button-hover);
    color: #fff;
}

button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.nav-row {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.status {
    font-size: 1rem;
    color: var(--text-muted);
    margin-left: 0.5rem;
}

.keyboard-hint {
    font-size: 0.85rem;
    color: var(--text-hint);
    margin-top: 0.5rem;
    text-align: center;
    width: 100%;
}

.question-card {
    background: var(--bg-card);
    border: 2px solid var(--border-card);
    border-radius: 16px;
    padding: 3rem;
    max-width: 900px;
    width: 100%;
    min-height: 200px;
    max-height: 70vh;
    overflow-y: auto;
    position: relative;
    transition: background 0.3s, border-color 0.3s;
}

.question-card .author {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.question-card .content {
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--text-main);
}

.question-card .content p {
    margin-bottom: 1rem;
}

.question-card .content strong {
    color: var(--text-strong);
}

.scroll-hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding-top: 0.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

.placeholder {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.4rem;
    font-style: italic;
}

.done-message {
    text-align: center;
    color: var(--text-done);
    font-size: 1.4rem;
}

/* Primary action button stands out */
#pickBtn {
    background: var(--bg-pick);
    font-weight: bold;
    color: #fff;
}

#pickBtn:hover:not(:disabled) {
    background: var(--bg-pick-hover);
}

/* Theme toggle button */
#themeBtn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: 2px solid var(--border-card);
    font-size: 1.4rem;
    padding: 0.4rem 0.6rem;
    line-height: 1;
}

#themeBtn:hover {
    background: var(--bg-card);
}

@media (max-width: 600px) {
    body { padding: 1rem 0.75rem; }
    h1 { font-size: 1.3rem; margin-bottom: 1rem; }

    .controls {
        flex-direction: column;
        gap: 0.5rem;
        margin-bottom: 1rem;
    }

    select {
        width: 100%;
        font-size: 1.1rem;
    }

    .nav-row {
        display: flex;
        width: 100%;
        gap: 0.5rem;
    }

    .nav-row button {
        flex: 1;
        font-size: 1rem;
        padding: 0.7rem 0.5rem;
    }

    .nav-row #pickBtn {
        flex: 2;
    }

    .keyboard-hint { display: none; }

    .status {
        margin-left: 0;
        text-align: center;
        width: 100%;
    }

    .question-card {
        padding: 1.2rem;
        border-radius: 12px;
        max-height: 60vh;
    }

    .question-card .content { font-size: 1.15rem; }
    .placeholder, .done-message { font-size: 1.1rem; }
}