:root {
    --font-family-stack: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Noto Sans TC", system-ui, sans-serif;
    --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    --font-size-base: 16px;
    --font-weight-base: 400;
    --line-height-base: 1.55;
    --color-ink: #1d1d1f;
    --color-ink-soft: #424245;
    --color-muted: #6e6e73;
    --color-paper: #f5f5f7;
    --color-surface: #ffffff;
    --color-surface-soft: #fbfbfd;
    --color-blue: #0071e3;
    --color-blue-deep: #005bb5;
    --color-blue-soft: #e8f2ff;
    --color-orange: #ff9f0a;
    --color-border: rgba(29, 29, 31, 0.12);
    --color-border-light: rgba(255, 255, 255, 0.25);
    --color-focus: rgba(0, 113, 227, 0.42);
    --color-success-bg: #eaf8ef;
    --color-success-border: #27864b;
    --color-success-text: #126132;
    --color-error-bg: #fff0f0;
    --color-error-border: #d63b3b;
    --color-error-text: #9c1c1c;
    --color-warning-bg: #fff8e7;
    --color-warning-border: #d98b00;
    --color-warning-text: #725000;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-7: 32px;
    --space-8: 48px;
    --space-9: 64px;
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 28px;
    --radius-xl: 36px;
    --shadow-soft: 0 8px 30px rgba(29, 29, 31, 0.06);
    --shadow-card: 0 16px 45px rgba(29, 29, 31, 0.08);
    --shadow-float: 0 18px 55px rgba(29, 29, 31, 0.16);
    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
    --motion-press: 160ms;
    --motion-fast: 220ms;
    --motion-slow: 420ms;
    --z-sticky: 30;
}

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

html {
    scroll-behavior: smooth;
}

body {
    position: relative;
    isolation: isolate;
    min-height: 100dvh;
    overflow-x: hidden;
    background: var(--color-paper);
    color: var(--color-ink);
    font-family: var(--font-family-stack);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-base);
    line-height: var(--line-height-base);
    padding-bottom: 170px;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(circle at 8% 8%, rgba(0, 113, 227, 0.08), transparent 28%),
        radial-gradient(circle at 92% 38%, rgba(255, 159, 10, 0.06), transparent 24%),
        linear-gradient(180deg, #ffffff 0, var(--color-paper) 32rem);
}

::selection {
    background: rgba(0, 113, 227, 0.18);
}

button,
input,
progress {
    font: inherit;
}

a {
    color: inherit;
}

.skip-link {
    position: fixed;
    top: var(--space-4);
    left: var(--space-4);
    z-index: 50;
    transform: translateY(-160%);
    border-radius: var(--radius-sm);
    background: var(--color-ink);
    color: var(--color-surface);
    padding: 10px 16px;
    font-weight: 700;
    text-decoration: none;
    transition: transform var(--motion-fast) var(--ease-out);
}

.skip-link:focus {
    transform: translateY(0);
}

.app {
    width: min(100%, 1160px);
    margin: 0 auto;
    padding: 24px 24px 48px;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
    padding: 4px 4px 28px;
}

.brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
    border-radius: 16px;
    color: var(--color-ink);
    text-decoration: none;
    transition: opacity var(--motion-press) ease, transform var(--motion-press) var(--ease-out);
}

.brand-lockup:active {
    transform: scale(0.98);
}

.brand-lockup:focus-visible,
.copyright a:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 4px;
}

.brand-logo {
    display: block;
    width: min(156px, 54vw);
    height: auto;
}

.brand-caption {
    border-left: 1px solid var(--color-border);
    color: var(--color-muted);
    padding-left: 14px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.header-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-muted);
    font-family: var(--font-family-mono);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-align: right;
}

.header-dot,
.eyebrow-mark,
.status-pulse {
    display: inline-block;
    width: 7px;
    height: 7px;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--color-blue);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12);
}

.hero {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.55fr);
    min-height: 520px;
    overflow: hidden;
    isolation: isolate;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    background:
        linear-gradient(104deg, rgba(13, 18, 27, 0.98) 0%, rgba(16, 23, 34, 0.9) 43%, rgba(21, 27, 41, 0.4) 100%),
        linear-gradient(180deg, rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.64)),
        url("hero-banner.png") center / cover no-repeat;
    box-shadow: var(--shadow-float);
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(circle at 75% 42%, rgba(0, 113, 227, 0.28), transparent 26%),
        radial-gradient(circle at 18% 18%, rgba(255, 159, 10, 0.18), transparent 24%);
}

.hero::after {
    content: "";
    position: absolute;
    right: -12%;
    bottom: -42%;
    z-index: -1;
    width: 70%;
    aspect-ratio: 1;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 50%;
    box-shadow: 0 0 0 36px rgba(255, 255, 255, 0.04), 0 0 0 72px rgba(255, 255, 255, 0.025);
    pointer-events: none;
}

.hero-content {
    align-self: end;
    max-width: 690px;
    padding: clamp(32px, 6vw, 72px);
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-muted);
    font-family: var(--font-family-mono);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    line-height: 1.2;
    text-transform: uppercase;
}

.hero-eyebrow {
    color: rgba(255, 255, 255, 0.7);
}

.hero-eyebrow .eyebrow-mark {
    background: var(--color-orange);
    box-shadow: 0 0 0 4px rgba(255, 159, 10, 0.14);
}

h1#quizTitle {
    max-width: 22ch;
    margin-top: 22px;
    color: var(--color-surface);
    font-size: clamp(2.45rem, 5.8vw, 4.85rem);
    font-weight: 750;
    letter-spacing: -0.055em;
    line-height: 0.98;
    text-wrap: balance;
}

.title-main,
.title-sub {
    display: block;
}

.title-main {
    white-space: nowrap;
}

.hero-copy {
    max-width: 48ch;
    margin-top: 28px;
    color: rgba(255, 255, 255, 0.75);
    font-size: clamp(1rem, 1.5vw, 1.14rem);
    line-height: 1.65;
    text-wrap: pretty;
}

.hero-info {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 34px;
}

.hero-detail {
    display: grid;
    gap: 5px;
    min-width: 132px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.1);
    padding: 13px 16px;
    color: var(--color-surface);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
}

.detail-label {
    color: rgba(255, 255, 255, 0.54);
    font-size: 0.75rem;
    font-weight: 700;
}

.hero-detail strong {
    font-size: 1rem;
    font-weight: 700;
}

.hero-art {
    position: relative;
    min-height: 320px;
}

.art-orbit {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 50%;
    transform: rotate(-22deg);
}

.art-orbit-one {
    top: 19%;
    right: -10%;
    width: 470px;
    height: 210px;
}

.art-orbit-two {
    top: 31%;
    right: 2%;
    width: 340px;
    height: 150px;
    border-color: rgba(0, 113, 227, 0.5);
}

.art-glow {
    position: absolute;
    top: 24%;
    right: 18%;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(0, 113, 227, 0.22);
    filter: blur(28px);
}

.art-window {
    position: absolute;
    top: 24%;
    right: 12%;
    width: min(330px, 76%);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 22px;
    background: rgba(13, 18, 27, 0.58);
    box-shadow: 0 24px 65px rgba(0, 0, 0, 0.34);
    color: rgba(255, 255, 255, 0.78);
    font-family: var(--font-family-mono);
    backdrop-filter: blur(22px) saturate(150%);
    -webkit-backdrop-filter: blur(22px) saturate(150%);
    transform: rotate(7deg);
}

.art-window-bar {
    display: flex;
    gap: 6px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    padding: 14px 16px;
}

.art-window-bar span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.38);
}

.art-window-bar span:first-child {
    background: #ff6259;
}

.art-window-bar span:nth-child(2) {
    background: #ffbd2e;
}

.art-window-bar span:last-child {
    background: #28c840;
}

.art-code-line {
    display: flex;
    gap: 12px;
    padding: 7px 20px;
    font-size: 0.76rem;
    line-height: 1.5;
    white-space: nowrap;
}

.art-code-line:last-child {
    padding-bottom: 22px;
}

.art-code-indent {
    padding-left: 50px;
}

.code-number {
    width: 18px;
    color: rgba(255, 255, 255, 0.28);
    text-align: right;
}

.code-keyword {
    color: #ff9f0a;
}

.code-name,
.code-accent {
    color: #76d5ff;
}

.code-muted {
    color: rgba(255, 255, 255, 0.52);
}

.notice {
    display: none;
    align-items: center;
    gap: 12px;
    border: 1px solid rgba(217, 139, 0, 0.34);
    border-radius: var(--radius-md);
    background: rgba(255, 248, 231, 0.9);
    color: var(--color-warning-text);
    padding: 16px 20px;
    margin: 24px 0;
    font-weight: 700;
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.notice::before {
    content: "!";
    display: inline-grid;
    width: 24px;
    height: 24px;
    flex: 0 0 auto;
    place-items: center;
    border-radius: 50%;
    background: rgba(217, 139, 0, 0.16);
    color: var(--color-warning-text);
    font-size: 0.8rem;
    font-weight: 900;
}

.notice.is-visible {
    display: flex;
    animation: noticeReveal var(--motion-fast) var(--ease-out) both;
}

@keyframes noticeReveal {
    from {
        opacity: 0;
        transform: translateY(-8px) scale(0.99);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.sticky-status {
    position: fixed;
    right: auto;
    bottom: 18px;
    left: 50%;
    z-index: var(--z-sticky);
    display: grid;
    grid-template-columns: minmax(300px, 1fr) auto auto;
    align-items: center;
    gap: 24px;
    width: min(calc(100% - 32px), 1112px);
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.76);
    box-shadow: var(--shadow-float);
    padding: 13px 14px 13px 20px;
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    transform: translateX(-50%);
}

.status-left {
    display: flex;
    align-items: center;
    gap: 24px;
    min-width: 0;
}

.progress-container {
    display: grid;
    gap: 7px;
    min-width: 0;
    flex: 1;
}

.progress-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.progress-heading,
.progress-label {
    color: var(--color-ink-soft);
    font-size: 0.8rem;
    font-weight: 750;
    white-space: nowrap;
}

.progress-heading {
    display: flex;
    align-items: center;
    gap: 9px;
}

.status-pulse {
    width: 6px;
    height: 6px;
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

progress {
    display: block;
    width: 100%;
    min-width: 140px;
    height: 7px;
    overflow: hidden;
    border: 0;
    border-radius: 999px;
    background-color: rgba(29, 29, 31, 0.09);
    accent-color: var(--color-blue);
}

progress::-webkit-progress-bar {
    border-radius: inherit;
    background-color: rgba(29, 29, 31, 0.09);
}

progress::-webkit-progress-value {
    border-radius: inherit;
    background: linear-gradient(90deg, var(--color-blue), #39a3ff);
}

progress::-moz-progress-bar {
    border-radius: inherit;
    background: linear-gradient(90deg, var(--color-blue), #39a3ff);
}

.timer-container {
    display: flex;
    align-items: baseline;
    gap: 9px;
    min-width: max-content;
    border-left: 1px solid var(--color-border);
    padding-left: 24px;
    color: var(--color-ink);
    font-family: var(--font-family-mono);
    font-size: 0.96rem;
    font-variant-numeric: tabular-nums;
    font-weight: 800;
}

.timer-label {
    color: var(--color-muted);
    font-family: var(--font-family-stack);
    font-size: 0.72rem;
    font-weight: 700;
}

.copyright {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--color-muted);
    font-size: 0.78rem;
    white-space: nowrap;
}

.copyright a {
    color: var(--color-ink-soft);
    font-weight: 750;
    text-decoration: underline;
    text-decoration-color: rgba(0, 113, 227, 0.45);
    text-underline-offset: 3px;
}

.footer-actions {
    display: flex;
    justify-content: flex-end;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 44px;
    border: 1px solid transparent;
    border-radius: 14px;
    padding: 10px 17px;
    color: var(--color-ink);
    font-size: 0.92rem;
    font-weight: 750;
    cursor: pointer;
    text-decoration: none;
    touch-action: manipulation;
    transition: background-color var(--motion-press) ease, border-color var(--motion-press) ease, color var(--motion-press) ease, box-shadow var(--motion-press) ease, transform var(--motion-press) var(--ease-out);
}

.btn:active {
    transform: scale(0.97);
}

.btn:focus-visible,
.option-label:focus-within {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
}

.button-icon {
    width: 17px;
    height: 17px;
    flex: 0 0 auto;
}

.button-icon-forward {
    width: 18px;
}

.btn-primary {
    background: var(--color-blue);
    color: var(--color-surface);
    box-shadow: 0 6px 16px rgba(0, 113, 227, 0.22);
}

.btn-primary:hover {
    background: var(--color-blue-deep);
    box-shadow: 0 9px 20px rgba(0, 113, 227, 0.28);
}

.btn-secondary {
    border-color: var(--color-border);
    background: rgba(255, 255, 255, 0.7);
    color: var(--color-ink-soft);
}

.btn-secondary:hover {
    border-color: rgba(0, 113, 227, 0.25);
    background: var(--color-surface);
    color: var(--color-blue-deep);
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.55;
    transform: none;
}

.result-block {
    display: none;
    border: 1px solid rgba(0, 113, 227, 0.18);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.84);
    padding: clamp(24px, 4vw, 36px);
    margin: 28px 0 48px;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
}

.result-block.is-visible {
    display: block;
    animation: resultReveal var(--motion-slow) var(--ease-out) both;
}

@keyframes resultReveal {
    from {
        opacity: 0;
        filter: blur(4px);
        transform: translateY(12px) scale(0.985);
    }
    to {
        opacity: 1;
        filter: blur(0);
        transform: translateY(0) scale(1);
    }
}

.result-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
}

.result-title {
    margin-top: 10px;
    color: var(--color-ink);
    font-size: clamp(1.35rem, 3vw, 2rem);
    font-weight: 750;
    letter-spacing: -0.035em;
    line-height: 1.2;
}

.result-badge {
    border: 1px solid rgba(39, 134, 75, 0.2);
    border-radius: 999px;
    background: var(--color-success-bg);
    color: var(--color-success-text);
    padding: 8px 12px;
    font-size: 0.78rem;
    font-weight: 800;
    white-space: nowrap;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    max-width: 500px;
    margin-top: 28px;
}

.stat-card {
    display: grid;
    gap: 5px;
    border: 1px solid var(--color-border);
    border-radius: 18px;
    background: rgba(245, 245, 247, 0.8);
    padding: 18px 20px;
}

.stat-label {
    color: var(--color-muted);
    font-size: 0.8rem;
    font-weight: 700;
}

.stat-value {
    color: var(--color-ink);
    font-size: clamp(1.7rem, 3vw, 2.3rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    font-variant-numeric: tabular-nums;
}

.section-heading {
    display: grid;
    gap: 10px;
    max-width: 680px;
    margin: 8px 0 28px;
}

.section-kicker {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-blue-deep);
    font-family: var(--font-family-mono);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.13em;
}

.section-kicker span:first-child {
    display: inline-grid;
    width: 26px;
    height: 26px;
    place-items: center;
    border-radius: 50%;
    background: var(--color-blue-soft);
    color: var(--color-blue-deep);
    letter-spacing: 0;
}

.section-heading h2 {
    color: var(--color-ink);
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 750;
    letter-spacing: -0.055em;
    line-height: 1.02;
}

.section-heading p {
    color: var(--color-muted);
    font-size: 1rem;
    line-height: 1.65;
}

.questions-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

fieldset.question-card {
    min-inline-size: 0;
    position: relative;
    border: 1px solid var(--color-border);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.78);
    padding: clamp(22px, 3.5vw, 32px);
    box-shadow: var(--shadow-soft);
    transition: border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease, background-color var(--motion-fast) ease;
}

legend {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    width: 100%;
    color: var(--color-ink);
    font-size: clamp(1.08rem, 2vw, 1.32rem);
    font-weight: 750;
    letter-spacing: -0.018em;
    line-height: 1.45;
    margin-bottom: 22px;
    padding: 0;
}

.question-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex: 0 0 auto;
    margin-top: 1px;
    border-radius: 12px;
    background: var(--color-ink);
    color: var(--color-surface);
    font-family: var(--font-family-mono);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0;
    font-variant-numeric: tabular-nums;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

.option-label {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 14px;
    min-height: 60px;
    border: 1px solid var(--color-border);
    border-radius: 17px;
    background: rgba(255, 255, 255, 0.72);
    color: var(--color-ink-soft);
    padding: 12px 16px;
    cursor: pointer;
    line-height: 1.45;
    transition: background-color var(--motion-press) ease, border-color var(--motion-press) ease, box-shadow var(--motion-press) ease, color var(--motion-press) ease, transform var(--motion-press) var(--ease-out);
}

.option-label:active {
    transform: scale(0.985);
}

.option-label input[type="radio"] {
    width: 19px;
    height: 19px;
    flex-shrink: 0;
    accent-color: var(--color-blue);
    cursor: pointer;
}

.option-label.is-selected {
    border-color: rgba(0, 113, 227, 0.42);
    background: var(--color-blue-soft);
    box-shadow: inset 0 0 0 1px rgba(0, 113, 227, 0.08);
    color: var(--color-ink);
}

.option-label.is-selected::after {
    content: "已選";
    color: var(--color-blue-deep);
    font-size: 0.76rem;
    font-weight: 800;
}

#examForm.is-submitted .option-label {
    cursor: default;
}

#examForm.is-submitted .option-label.correct-option {
    border-color: rgba(39, 134, 75, 0.56);
    background: var(--color-success-bg);
    color: var(--color-success-text);
    font-weight: 700;
}

#examForm.is-submitted .option-label.correct-option::after {
    content: "答對";
    color: var(--color-success-text);
    font-size: 0.76rem;
    font-weight: 800;
}

#examForm.is-submitted .option-label.incorrect-option {
    border-color: rgba(214, 59, 59, 0.52);
    background: var(--color-error-bg);
    color: var(--color-error-text);
    font-weight: 700;
}

#examForm.is-submitted .option-label.incorrect-option::after {
    content: "你的答案";
    color: var(--color-error-text);
    font-size: 0.76rem;
    font-weight: 800;
}

fieldset.question-card.unanswered-warning {
    border-color: rgba(217, 139, 0, 0.65);
    background: rgba(255, 248, 231, 0.86);
    box-shadow: 0 10px 32px rgba(217, 139, 0, 0.1);
}

fieldset.question-card.unanswered-warning::after {
    content: "未作答";
    position: absolute;
    top: 26px;
    right: 30px;
    color: var(--color-warning-text);
    font-size: 0.76rem;
    font-weight: 800;
}

#examForm.is-submitted fieldset.question-card.correct-card {
    border-color: rgba(39, 134, 75, 0.42);
}

#examForm.is-submitted fieldset.question-card.incorrect-card {
    border-color: rgba(214, 59, 59, 0.38);
}

code.inline-code {
    display: inline-block;
    margin: 0 2px;
    border: 1px solid rgba(0, 113, 227, 0.16);
    border-radius: 7px;
    background: var(--color-blue-soft);
    color: var(--color-blue-deep);
    padding: 2px 6px;
    font-family: var(--font-family-mono);
    font-size: 0.86em;
    white-space: nowrap;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 32px;
}

.page-footer {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--color-muted);
    font-size: 0.76rem;
    letter-spacing: 0.02em;
    margin-top: 60px;
    padding: 0 4px;
}

.footer-rule {
    width: 34px;
    height: 1px;
    background: var(--color-border);
}

@media (hover: hover) and (pointer: fine) {
    .brand-lockup:hover {
        opacity: 0.72;
    }

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

    fieldset.question-card:hover {
        border-color: rgba(0, 113, 227, 0.28);
        box-shadow: 0 18px 50px rgba(29, 29, 31, 0.1);
    }

    .option-label:hover {
        border-color: rgba(0, 113, 227, 0.3);
        background: var(--color-surface);
    }
}

@media (max-width: 860px) {
    body {
        padding-bottom: 235px;
    }

    .hero {
        grid-template-columns: 1fr;
        min-height: 650px;
    }

    .hero-content {
        align-self: start;
    }

    .hero-art {
        min-height: 260px;
        margin-top: -16px;
    }

    .art-window {
        top: 2%;
        right: 12%;
    }

    .sticky-status {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .copyright {
        display: none;
    }
}

@media (max-width: 620px) {
    .app {
        padding: 16px 16px 32px;
    }

    .site-header {
        align-items: flex-start;
        padding: 3px 2px 22px;
    }

    .brand-caption,
    .header-meta span:not(:last-child),
    .header-dot {
        display: none;
    }

    .header-meta {
        font-size: 0.6rem;
        padding-top: 5px;
    }

    .hero {
        min-height: 660px;
        border-radius: 28px;
    }

    .hero-content {
        padding: 30px 24px 0;
    }

    h1#quizTitle {
        max-width: 17ch;
        font-size: clamp(1.75rem, 8.5vw, 3.8rem);
    }

    .hero-copy {
        margin-top: 22px;
        font-size: 0.98rem;
    }

    .hero-info {
        margin-top: 24px;
    }

    .hero-detail {
        flex: 1;
        min-width: 0;
    }

    .hero-art {
        min-height: 220px;
    }

    .art-orbit-one {
        right: -46%;
        width: 410px;
    }

    .art-orbit-two {
        right: -24%;
    }

    .art-window {
        top: 2%;
        right: 9%;
        width: 78%;
    }

    .art-code-line {
        padding-right: 14px;
        padding-left: 14px;
        font-size: 0.64rem;
    }

    .art-code-indent {
        padding-left: 34px;
    }

    .sticky-status {
        right: 0;
        bottom: 0;
        left: 0;
        grid-template-columns: 1fr;
        gap: 12px;
        width: 100%;
        border-right: 0;
        border-bottom: 0;
        border-left: 0;
        border-radius: 24px 24px 0 0;
        padding: 14px 16px 16px;
        transform: none;
    }

    .status-left {
        align-items: stretch;
        flex-direction: column;
        gap: 13px;
    }

    .timer-container {
        justify-content: space-between;
        border-top: 1px solid var(--color-border);
        border-left: 0;
        padding-top: 11px;
        padding-left: 0;
    }

    .footer-actions,
    .footer-actions .btn {
        width: 100%;
    }

    .footer-actions .btn {
        min-height: 42px;
    }

    .result-heading {
        display: grid;
        gap: 16px;
    }

    .result-badge {
        justify-self: start;
    }

    .result-stats {
        gap: 10px;
    }

    .section-heading {
        margin-top: 4px;
    }

    fieldset.question-card {
        border-radius: 21px;
        padding: 22px 18px 18px;
    }

    legend {
        font-size: 1.05rem;
    }

    .question-num {
        width: 32px;
        height: 32px;
    }

    .option-label {
        grid-template-columns: auto minmax(0, 1fr);
        min-height: 58px;
        padding: 11px 13px;
    }

    .option-label.is-selected::after,
    #examForm.is-submitted .option-label.correct-option::after,
    #examForm.is-submitted .option-label.incorrect-option::after {
        grid-column: 2;
        justify-self: start;
    }

    fieldset.question-card.unanswered-warning::after {
        top: 23px;
        right: 18px;
    }

    .form-actions {
        flex-direction: column-reverse;
    }

    .form-actions .btn {
        width: 100%;
    }

    .page-footer {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
        margin-top: 44px;
    }

    .footer-rule {
        width: 24px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }

    .btn:active,
    .option-label:active,
    .brand-lockup:active {
        transform: none;
    }

    .result-block.is-visible,
    .notice.is-visible {
        animation: none;
        filter: none;
        opacity: 1;
        transform: none;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .brand-lockup,
    .hero-detail,
    .notice,
    .sticky-status,
    .result-block,
    fieldset.question-card,
    .option-label {
        background: var(--color-surface);
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }
}

@media (prefers-contrast: more) {
    .brand-lockup,
    .hero-detail,
    .sticky-status,
    .result-block,
    fieldset.question-card,
    .option-label,
    .btn {
        border-color: currentColor;
    }

    .option-label.is-selected {
        outline: 2px solid var(--color-blue);
        outline-offset: -2px;
    }
}