main#app {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

main#subpage,
.container {
    max-width: var(--max-width);
    padding: var(--spacing-large);
    text-align: center;
    z-index: 100;
    margin: 0 auto;
}

img {
    max-width: var(--img-max-width);
    height: auto;
}

a {
    text-decoration: none;
    color: inherit;
}

a:hover {
    text-decoration: underline;
    opacity: var(--color-opacity);
}

a:visited {
    color: inherit;
}

.download {
    text-decoration: underline;
}

.question-box {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-large);
}

.options-box {
    display: flex;
    justify-content: center;
    gap: var(--spacing-medium);
    flex-wrap: wrap;
}

.options-box button {
    font-family: inherit;
    font-size: var(--font-size-base);
    padding: calc(var(--spacing-small) * 1.5) var(--spacing-large);
    border: 1px solid var(--color-text);
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.options-box button:hover {
    background: var(--color-hover-bg);
    color: var(--color-hover-text);
}

#restart-btn {
    margin-top: var(--spacing-large);
    font-size: var(--font-size-base);
    border: none;
    background: none;
    text-decoration: underline;
    cursor: pointer;
    color: var(--color-text);
    opacity: var(--color-opacity);
}

.hidden {
    display: none;
}

/* UI buttons */
.ui-bottom-left,
.ui-bottom-right,
.ui-top-right {
    position: fixed;
    font-size: var(--font-size-small);
}

.ui-bottom-left {
    bottom: var(--spacing-medium);
    left: var(--spacing-medium);
    display: flex;
    gap: var(--spacing-medium);
}

.ui-bottom-right {
    bottom: var(--spacing-medium);
    right: var(--spacing-medium);
}

.ui-top-right {
    top: var(--spacing-medium);
    right: var(--spacing-medium);
}

.ui-bottom-left a,
#global-restart {
    font-size: var(--font-size-small);
    text-decoration: none;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.settings-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-medium);
    flex-wrap: wrap;
    margin: var(--spacing-large) 0;
}

.settings-buttons button {
    font-family: inherit;
    padding: var(--spacing-small) var(--spacing-medium);
    font-size: var(--font-size-small);
    background: transparent;
    border: 1px solid var(--color-text);
    color: var(--color-text);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.settings-buttons button:hover {
    background: var(--color-hover-bg);
    color: var(--color-hover-text);
}

#settings-message {
    margin-top: var(--spacing-medium);
    font-size: var(--font-size-small);
    color: var(--color-text);
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    height: 1.5rem; /* reserve space to prevent layout shift */
}

#settings-message.show {
    opacity: 1;
}

.ui-bottom-center {
    position: fixed;
    bottom: var(--spacing-medium);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-bg);
}

#custom-back-btn {
    font-family: inherit;
    font-size: var(--font-size-small);
    background: none;
    border: none;
    cursor: pointer;
    color: inherit;
    text-decoration: underline;
    opacity: var(--color-opacity);
    transition: opacity 0.2s ease;
}

#custom-back-btn:hover {
    opacity: 0.8;
}

#site-header {
    position: fixed;
    top: var(--spacing-medium);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.logo {
    font-size: var(--font-size-base);
    font-weight: normal;
    letter-spacing: 0.05em;
    color: inherit;
    font-family: inherit;
    opacity: 0.6;
    text-transform: lowercase;
    user-select: none;
    pointer-events: none;
}

#site-header img {
    max-width: var(--img-max-width);
}

/* --- Mobile Adjustments --- */
@media (max-width: 600px) {
    #site-header img,
    img {
        max-width: 200px;
    }

    .question-box {
        font-size: var(--font-size-medium);
    }

    .options-box button {
        font-size: var(--font-size-small);
        padding: var(--spacing-small) var(--spacing-medium);
    }

    .ui-bottom-left,
    .ui-bottom-right,
    .ui-bottom-center {
        font-size: var(--font-size-small);
    }
}