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

:root {
    --color-primary-blue: #1a56db;
    --color-primary-blue-strong: #153ea8;
    --color-accent-teal: #00b4a0;
    --color-cta-orange: #f59e0b;
    --color-cta-orange-strong: #d48806;
    --color-bg-white: #f8f9fa;
    --color-surface: rgba(248, 249, 250, 0.74);
    --color-surface-strong: rgba(255, 255, 255, 0.94);
    --color-text-main: #111827;
    --color-text-gray: #4b5563;
    --color-text-soft: #6b7280;
    --color-border-subtle: rgba(17, 24, 39, 0.08);
    --color-divider: rgba(17, 24, 39, 0.1);
    --color-success: #0f9f6e;
    --color-warning: #b96b00;
    --color-error: #c2410c;
    --color-overlay: rgba(15, 23, 42, 0.56);

    --glass-bg: rgba(248, 249, 250, 0.7);
    --glass-border: rgba(0, 180, 160, 0.24);
    --glass-shadow-1: 0 20px 50px rgba(17, 24, 39, 0.08);
    --glass-shadow-2: 0 6px 18px rgba(17, 24, 39, 0.06);
    --panel-shadow: 0 18px 42px rgba(17, 24, 39, 0.08);
    --panel-shadow-hover: 0 24px 52px rgba(17, 24, 39, 0.12);

    --radius-card: 24px;
    --radius-button: 16px;
    --radius-pill: 999px;

    --space-1: 8px;
    --space-2: 12px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;
    --space-6: 40px;
    --space-7: 48px;
    --space-8: 64px;

    --font-heading: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Segoe UI", sans-serif;
    --font-body: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Segoe UI", sans-serif;

    --h1-size: clamp(2.2rem, 4vw, 3.6rem);
    --h2-size: clamp(1.8rem, 3vw, 2.8rem);
    --h3-size: clamp(1.15rem, 2vw, 1.45rem);
    --body-size: 1rem;
    --small-size: 0.875rem;
    --body-line: 1.7;

    --dur-fast: 180ms;
    --dur-mid: 260ms;
    --dur-slow: 340ms;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-size: var(--body-size);
    line-height: var(--body-line);
    color: var(--color-text-main);
    min-height: 100vh;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: clamp(8px, 1.5vw, 16px);
    background:
        radial-gradient(circle at top left, rgba(0, 180, 160, 0.12), transparent 28%),
        radial-gradient(circle at top right, rgba(26, 86, 219, 0.12), transparent 32%),
        linear-gradient(180deg, #f7fbff 0%, #eff5fb 52%, #f8f9fa 100%);
    overflow-x: hidden;
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: auto;
    pointer-events: none;
    z-index: 0;
    border-radius: 50%;
    filter: blur(10px);
}

body::before {
    width: 260px;
    height: 260px;
    top: -72px;
    left: -72px;
    background: rgba(0, 180, 160, 0.12);
}

body::after {
    width: 320px;
    height: 320px;
    right: -110px;
    bottom: -96px;
    background: rgba(245, 158, 11, 0.12);
}

.container {
    position: relative;
    z-index: 1;
    width: min(100%, 920px);
    padding: clamp(16px, 2.4vw, 24px);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.95));
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-card);
    box-shadow: var(--panel-shadow);
    backdrop-filter: blur(12px);
}

body.start-page .container {
    width: min(100%, 880px);
}

body.level1-page .container,
body.level2-page .container {
    width: min(100%, 900px);
}

body.result-page .container {
    width: min(100%, 860px);
}

body.start-page .container,
body.result-page .container {
    text-align: center;
}

.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: fit-content;
    padding: 7px 14px;
    margin-bottom: 8px;
    margin-inline: auto;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(0, 180, 160, 0.18);
    background: rgba(0, 180, 160, 0.08);
    color: var(--color-primary-blue);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.brand-contact {
    color: var(--color-accent-teal);
    font-weight: 700;
}

.start-hero,
.result-hero,
.performance,
.process-review,
.achievement-card,
.scene,
.feature-card,
.feature-item,
.hotspot-card,
.feedback-modal-box {
    border-radius: var(--radius-card);
}

.game-title,
.result-title,
.level-title {
    font-family: var(--font-heading);
    color: var(--color-text-main);
}

.game-title {
    font-size: var(--h1-size);
    line-height: 1.08;
    font-weight: 900;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
    margin-inline: auto;
    max-width: 12ch;
    text-align: center;
}

.result-title {
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.08;
    font-weight: 900;
    margin-bottom: 6px;
}

.level-title {
    font-size: var(--h2-size);
    line-height: 1.15;
    font-weight: 900;
    margin-bottom: 4px;
}

.nav-title-group .level-title {
    margin: 0;
    font-size: clamp(1rem, 1.7vw, 1.36rem);
    line-height: 1.2;
}

.nav-title-group .level-badge {
    margin-bottom: 0;
}

.subtitle,
.level-hint,
.scene-desc,
.feature-feedback,
.encode-tip,
.feedback-modal-explanation,
.hotspot-card-desc,
.step-sub,
.stat .label,
.scene-img-placeholder,
.nav-level-info {
    color: var(--color-text-gray);
}

.subtitle {
    font-size: clamp(1rem, 1.8vw, 1.1rem);
    max-width: 48ch;
    margin-inline: auto;
    text-align: center;
}

.level-hint {
    font-size: 0.98rem;
    margin-bottom: 10px;
}

.level-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 28px;
    padding: 0 12px;
    margin-bottom: 8px;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(0, 180, 160, 0.18);
    background: rgba(0, 180, 160, 0.09);
    color: var(--color-accent-teal);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-divider);
}

.nav-title-group {
    display: grid;
    justify-items: center;
    gap: 2px;
    flex: 1;
    min-width: 0;
    text-align: center;
}

.nav-back,
.btn-action,
.btn-primary,
.btn-secondary {
    min-height: 42px;
    border-radius: var(--radius-button);
    font: inherit;
    font-weight: 700;
    transition:
        transform var(--dur-mid) var(--ease-out),
        box-shadow var(--dur-mid) var(--ease-out),
        border-color var(--dur-mid) var(--ease-out),
        background-color var(--dur-mid) var(--ease-out),
        color var(--dur-mid) var(--ease-out);
}

.nav-back,
.btn-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 16px;
    border: 1px solid rgba(26, 86, 219, 0.14);
    background: rgba(26, 86, 219, 0.04);
    color: var(--color-primary-blue);
    cursor: pointer;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 18px;
    border: 0;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-cta-orange) 0%, #f7b733 100%);
    color: #fff;
    box-shadow: 0 14px 28px rgba(245, 158, 11, 0.24);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--color-primary-blue) 0%, #3370f0 100%);
    color: #fff;
    box-shadow: 0 14px 28px rgba(26, 86, 219, 0.2);
}

.nav-back:hover,
.btn-action:hover,
.btn-primary:hover,
.btn-secondary:hover {
    transform: translateY(-2px);
}

.nav-back:hover,
.btn-action:hover {
    border-color: rgba(26, 86, 219, 0.3);
    background: rgba(26, 86, 219, 0.08);
    box-shadow: 0 10px 22px rgba(17, 24, 39, 0.08);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-cta-orange-strong) 0%, var(--color-cta-orange) 100%);
    box-shadow: 0 16px 32px rgba(245, 158, 11, 0.28);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--color-primary-blue-strong) 0%, var(--color-primary-blue) 100%);
    box-shadow: 0 16px 32px rgba(26, 86, 219, 0.24);
}

.nav-back:focus-visible,
.btn-action:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.option-card:focus-visible,
.feature-card:focus-visible,
.hotspot:focus-visible {
    outline: 3px solid rgba(26, 86, 219, 0.22);
    outline-offset: 3px;
}

.btn-primary:disabled,
.btn-secondary:disabled,
.btn-action:disabled {
    opacity: 0.72;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.hero-banner {
    position: relative;
    overflow: hidden;
    margin-bottom: 14px;
    width: min(100%, 88%);
    margin-inline: auto;
    border: 1px solid rgba(0, 180, 160, 0.18);
    border-radius: var(--radius-card);
    background:
        radial-gradient(circle at 12% 20%, rgba(0, 180, 160, 0.18), transparent 24%),
        linear-gradient(135deg, rgba(26, 86, 219, 0.08), rgba(0, 180, 160, 0.08));
}

.hero-banner::after {
    content: "";
    position: absolute;
    inset: auto 18px 18px auto;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.16), transparent 70%);
    pointer-events: none;
}

.hero-banner-img,
.hero-banner svg {
    display: block;
    width: 100%;
    height: auto;
}

.hero-banner-img {
    height: 340px;
    object-fit: cover;
}

.start-hero {
    display: grid;
    gap: 8px;
    margin-bottom: 14px;
    justify-items: center;
    text-align: center;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin: 0 0 14px;
}

.feature-item,
.process-review,
.performance,
.scene,
.achievement-card {
    background: var(--color-surface-strong);
    border: 1px solid var(--color-border-subtle);
    box-shadow: var(--glass-shadow-2);
}

.feature-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 10px;
    text-align: center;
}

.feature-item .icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 14px;
    background: rgba(26, 86, 219, 0.08);
    font-size: 1.05rem;
    flex: 0 0 auto;
}

.feature-item p {
    font-size: 0.84rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text-main);
    white-space: nowrap;
}

.phase {
    display: grid;
    gap: 10px;
}

.phase-indicator {
    display: grid;
    grid-template-columns: auto 1fr auto 1fr auto;
    align-items: center;
    gap: 8px;
    margin: 10px 0 4px;
}

.phase-dot {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid rgba(26, 86, 219, 0.14);
    background: #fff;
}

.phase-dot.active {
    border-color: var(--color-primary-blue);
    background: rgba(26, 86, 219, 0.14);
    box-shadow: 0 0 0 6px rgba(26, 86, 219, 0.08);
}

.phase-dot.done {
    border-color: var(--color-success);
    background: rgba(15, 159, 110, 0.14);
}

.phase-line {
    height: 2px;
    background: rgba(17, 24, 39, 0.1);
}

.phase-line.done {
    background: linear-gradient(90deg, var(--color-accent-teal), var(--color-success));
}

.phase-labels {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 4px;
}

.phase-label {
    font-size: 0.8rem;
    color: var(--color-text-soft);
    text-align: center;
}

.phase-labels .phase-label:first-child {
    justify-self: start;
    text-align: left;
}

.phase-labels .phase-label:nth-child(2) {
    justify-self: center;
}

.phase-labels .phase-label:last-child {
    justify-self: end;
    text-align: right;
}

.phase-label.active {
    color: var(--color-primary-blue);
    font-weight: 700;
}

.face-container {
    position: relative;
    display: inline-block;
    width: min(100%, 600px);
    margin: 0 auto;
    padding: 10px;
    border-radius: var(--radius-card);
    background: linear-gradient(180deg, rgba(26, 86, 219, 0.05), rgba(0, 180, 160, 0.06));
    border: 1px solid rgba(26, 86, 219, 0.08);
}

.student-face {
    width: min(100%, 310px);
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 16px;
    box-shadow: 0 12px 24px rgba(17, 24, 39, 0.1);
}

.face-placeholder {
    position: absolute;
    inset: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-radius: 20px;
    border: 2px dashed rgba(26, 86, 219, 0.24);
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.08), rgba(0, 180, 160, 0.08));
    color: var(--color-text-soft);
}

.face-placeholder i {
    font-size: 3rem;
    color: var(--color-primary-blue);
}

.face-placeholder.small {
    inset: 0;
    min-width: 120px;
    min-height: 152px;
}

.face-placeholder.small i {
    font-size: 2.2rem;
}

.hotspot {
    position: absolute;
    width: 36px;
    height: 36px;
    transform: translate(-50%, -50%);
    cursor: pointer;
    z-index: 2;
}

.hotspot-ring,
.hotspot-dot {
    position: absolute;
    inset: 0;
    border-radius: 50%;
}

.hotspot-ring {
    border: 2px solid rgba(26, 86, 219, 0.55);
    animation: hotspotPulse 1.8s ease-in-out infinite;
}

.hotspot-dot {
    inset: 10px;
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-accent-teal));
    box-shadow: 0 0 0 4px rgba(26, 86, 219, 0.12);
}

.hotspot.visited .hotspot-ring,
.hotspot:hover .hotspot-ring {
    border-color: rgba(15, 159, 110, 0.58);
    animation-play-state: paused;
}

.hotspot.visited .hotspot-dot,
.hotspot:hover .hotspot-dot {
    background: linear-gradient(135deg, var(--color-success), var(--color-accent-teal));
}

@keyframes hotspotPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.92;
    }
    50% {
        transform: scale(1.28);
        opacity: 0.4;
    }
}

.hotspot-card {
    display: none;
    grid-template-columns: auto auto minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    width: min(100%, 600px);
    padding: 14px 16px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.06), rgba(0, 180, 160, 0.06));
    border: 1px solid rgba(26, 86, 219, 0.12);
}

.hotspot-card.visible {
    display: grid;
}

.hotspot-card-body {
    display: contents;
}

.hotspot-card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: rgba(26, 86, 219, 0.08);
    font-size: 1.45rem;
}

.hotspot-card-title {
    margin-bottom: 0;
    font-weight: 800;
    color: var(--color-primary-blue);
    white-space: nowrap;
}

.hotspot-card-desc {
    font-size: 0.92rem;
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hotspot-progress {
    font-size: 0.86rem;
    color: var(--color-text-soft);
    margin-top: -2px;
}

.phase2-header {
    display: grid;
    gap: 8px;
}

.phase2-task {
    padding: 10px 14px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.06), rgba(0, 180, 160, 0.08));
    border: 1px solid rgba(26, 86, 219, 0.1);
    color: var(--color-text-main);
    font-weight: 700;
}

.feature-progress-bar {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: center;
}

.feature-progress-track {
    width: 100%;
    height: 10px;
    overflow: hidden;
    border-radius: var(--radius-pill);
    background: rgba(17, 24, 39, 0.08);
}

.feature-progress-fill {
    width: 0%;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--color-primary-blue), var(--color-accent-teal));
    transition: width var(--dur-slow) var(--ease-out);
}

.feature-progress-text {
    color: var(--color-primary-blue);
    font-size: 0.84rem;
    font-weight: 700;
    white-space: nowrap;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
}

.feature-card {
    position: relative;
    display: grid;
    justify-items: center;
    gap: 8px;
    padding: 14px 10px 12px;
    background: var(--color-surface-strong);
    border: 1px solid rgba(26, 86, 219, 0.12);
    cursor: pointer;
    text-align: center;
    user-select: none;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 26px rgba(17, 24, 39, 0.08);
    border-color: rgba(26, 86, 219, 0.22);
}

.feature-card.selected {
    border-color: rgba(26, 86, 219, 0.3);
    background: rgba(26, 86, 219, 0.06);
    box-shadow: inset 0 0 0 2px rgba(26, 86, 219, 0.08);
}

.feature-card.correct {
    border-color: rgba(15, 159, 110, 0.28);
    background: rgba(15, 159, 110, 0.08);
}

.feature-card.wrong {
    border-color: rgba(194, 65, 12, 0.28);
    background: rgba(194, 65, 12, 0.08);
}

.feature-card.wrong-dim {
    opacity: 0.42;
    filter: grayscale(0.25);
}

.feature-card-icon {
    font-size: 1.45rem;
}

.feature-card-label {
    font-size: 0.84rem;
    font-weight: 700;
    line-height: 1.45;
}

.feature-card-check {
    position: absolute;
    top: 10px;
    right: 10px;
    display: none;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--color-primary-blue);
    color: #fff;
    font-size: 0.72rem;
}

.feature-card.selected .feature-card-check,
.feature-card.correct .feature-card-check {
    display: flex;
}

.feature-card.correct .feature-card-check {
    background: var(--color-success);
}

.feature-feedback {
    min-height: 46px;
    padding: 10px 14px;
    border-radius: 18px;
    font-size: 0.92rem;
    line-height: 1.6;
}

.feature-feedback.success,
.message.success,
.result.success {
    background: rgba(15, 159, 110, 0.08);
    border: 1px solid rgba(15, 159, 110, 0.18);
    color: var(--color-success);
}

.feature-feedback.error,
.message.error,
.result.error {
    background: rgba(194, 65, 12, 0.08);
    border: 1px solid rgba(194, 65, 12, 0.16);
    color: var(--color-error);
}

.encode-visual {
    display: grid;
    grid-template-columns: 120px 32px minmax(0, 220px);
    gap: 14px;
    align-items: center;
    justify-content: center;
    width: min(100%, 560px);
    margin-inline: auto;
    padding: 14px;
    border-radius: var(--radius-card);
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.04), rgba(0, 180, 160, 0.06));
    border: 1px solid rgba(26, 86, 219, 0.08);
}

.encode-face {
    width: 120px;
    height: 150px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 20px;
    border: 1px solid rgba(26, 86, 219, 0.1);
    background: rgba(26, 86, 219, 0.04);
}

.encode-face-img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center;
    border-radius: 0;
    box-shadow: 0 10px 20px rgba(17, 24, 39, 0.1);
}

.encode-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(26, 86, 219, 0.08);
    color: var(--color-primary-blue);
    font-size: 0.95rem;
}

.encode-bars {
    display: grid;
    gap: 10px;
    width: 100%;
}

.encode-bar-wrap {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 12px;
    align-items: center;
}

.encode-label {
    font-size: 0.8rem;
    color: var(--color-text-soft);
}

.encode-bar {
    height: 16px;
    width: var(--bar-w, 0%);
    min-width: 8px;
    max-width: 100%;
    border-radius: var(--radius-pill);
    background: var(--bar-color, var(--color-primary-blue));
    transition: width var(--dur-slow) var(--ease-out);
    box-shadow: 0 6px 12px rgba(17, 24, 39, 0.08);
}

.encode-tip {
    font-size: 0.92rem;
    min-height: 20px;
}

.encode-tip.success {
    color: var(--color-success);
    font-weight: 700;
}

.message,
.result {
    min-height: 42px;
    padding: 10px 14px;
    border-radius: 18px;
    font-size: 0.92rem;
    font-weight: 700;
}

.scene-progress {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
}

.scene-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(17, 24, 39, 0.12);
}

.scene-dot.active {
    background: var(--color-primary-blue);
    transform: scale(1.2);
    box-shadow: 0 0 0 6px rgba(26, 86, 219, 0.08);
}

.scene-dot.done {
    background: var(--color-accent-teal);
}

.scene-image-wrap {
    overflow: hidden;
    margin-bottom: 8px;
    border-radius: var(--radius-card);
    border: 1px solid rgba(26, 86, 219, 0.08);
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.05), rgba(0, 180, 160, 0.06));
}

.scene-img {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 8.1;
    object-fit: cover;
    max-height: 220px;
}

.scene-img-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 180px;
    padding: 14px;
    text-align: center;
    font-weight: 700;
}

.scene {
    padding: 14px 16px;
    text-align: left;
}

.scene-title {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.scene-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(26, 86, 219, 0.08);
    font-size: 1.2rem;
}

.scene-title strong {
    font-size: 1.05rem;
    color: var(--color-text-main);
}

.options {
    display: grid;
    gap: 8px;
}

.option-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: center;
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    border-radius: 18px;
    background: var(--color-surface-strong);
    color: var(--color-text-main);
    text-align: left;
    cursor: pointer;
    font: inherit;
}

.option-card:hover:not(:disabled) {
    transform: translateY(-2px);
    border-color: rgba(26, 86, 219, 0.24);
    box-shadow: 0 14px 28px rgba(17, 24, 39, 0.08);
}

.option-card:disabled {
    cursor: default;
}

.option-card.correct {
    border-color: rgba(15, 159, 110, 0.28);
    background: rgba(15, 159, 110, 0.08);
}

.option-card.wrong {
    border-color: rgba(194, 65, 12, 0.24);
    background: rgba(194, 65, 12, 0.08);
}

.option-card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(17, 24, 39, 0.04);
    font-size: 1.15rem;
    align-self: center;
    justify-self: center;
    line-height: 1;
}

.option-card-icon::before {
    display: block;
    line-height: 1;
}

.option-card-text {
    line-height: 1.45;
}

.controls,
.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 4px;
}

.buttons {
    justify-content: center;
    align-items: center;
}

.feedback-modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 14px;
    background: var(--color-overlay);
    z-index: 1000;
}

.feedback-modal.visible {
    display: flex;
}

.feedback-modal-box {
    width: min(100%, 460px);
    padding: 20px;
    background: #fff;
    border: 1px solid rgba(17, 24, 39, 0.08);
    box-shadow: 0 28px 60px rgba(15, 23, 42, 0.2);
}

.feedback-modal-icon {
    margin-bottom: 10px;
    font-size: 2.8rem;
    line-height: 1;
}

.feedback-modal-result {
    margin-bottom: 12px;
    font-size: 1.35rem;
    font-weight: 900;
}

.feedback-modal-result.success {
    color: var(--color-success);
}

.feedback-modal-result.error {
    color: var(--color-error);
}

.feedback-modal-explanation {
    margin-bottom: 14px;
    padding: 12px 14px;
    border-radius: 16px;
    background: rgba(26, 86, 219, 0.05);
    border: 1px solid rgba(26, 86, 219, 0.08);
    font-size: 0.95rem;
}

.feedback-modal-btn {
    width: 100%;
}

.result-hero {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 88px;
    height: 88px;
    margin-bottom: 16px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.16), rgba(0, 180, 160, 0.12));
    font-size: 2.8rem;
}

.buttons {
    margin: 14px 0 16px;
}

.achievement-card {
    position: relative;
    overflow: hidden;
    padding: 18px;
    margin-bottom: 12px;
    background:
        radial-gradient(circle at top right, rgba(245, 158, 11, 0.16), transparent 28%),
        linear-gradient(135deg, rgba(26, 86, 219, 0.96), rgba(0, 180, 160, 0.96));
    color: #fff;
}

.achievement-card h3 {
    margin-bottom: 10px;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    opacity: 0.84;
}

.card-content {
    margin-bottom: 12px;
    padding: 14px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.16);
}

.card-content h4 {
    margin-bottom: 6px;
    font-size: 1.15rem;
    font-weight: 900;
}

.card-content p {
    color: rgba(255, 255, 255, 0.88);
}

.performance,
.process-review {
    padding: 18px;
    margin-bottom: 12px;
}

.performance h3,
.process-review h3 {
    margin-bottom: 10px;
    font-size: 0.96rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--color-primary-blue);
    text-transform: uppercase;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.stat,
.step-card {
    border-radius: 18px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: rgba(26, 86, 219, 0.04);
}

.stat {
    display: grid;
    gap: 6px;
    padding: 14px 12px;
}

.stat .label {
    font-size: 0.82rem;
    font-weight: 700;
}

.stat .value {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    line-height: 1;
    font-weight: 900;
    color: var(--color-text-main);
}

.stat .unit {
    font-size: 0.92rem;
    color: var(--color-text-soft);
}

#stars {
    display: flex;
    gap: 6px;
    align-items: center;
    justify-content: center;
    min-height: 32px;
    color: var(--color-cta-orange);
}

#stars i {
    font-size: 1.35rem;
}

.step-cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.step-card {
    display: grid;
    justify-items: center;
    gap: 8px;
    padding: 14px 12px;
    text-align: center;
}

.step-card i {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: rgba(0, 180, 160, 0.12);
    color: var(--color-accent-teal);
    font-size: 1.1rem;
}

.step-card p {
    font-weight: 800;
    color: var(--color-text-main);
    text-align: center;
}

.step-sub {
    font-size: 0.9rem;
    font-weight: 600;
}

@media (max-width: 960px) {
    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .encode-visual {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
        width: 100%;
    }

    .encode-bar-wrap {
        width: min(100%, 280px);
    }

    .scene-title {
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 14px 14px;
    }

    .nav-bar {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .nav-title-group {
        order: 3;
        width: 100%;
        justify-items: start;
        text-align: left;
    }

    .features,
    .stats-grid,
    .step-cards {
        grid-template-columns: 1fr;
    }

    .buttons,
    .controls {
        flex-direction: column;
    }

    .buttons > *,
    .controls > *,
    .btn-primary,
    .btn-secondary,
    .btn-action {
        width: 100%;
    }

    .phase-label {
        font-size: 0.74rem;
    }
}

@media (max-width: 560px) {
    .brand {
        width: 100%;
        justify-content: center;
        text-align: center;
        line-height: 1.5;
    }

    .game-title,
    .result-title,
    .level-title {
        max-width: none;
    }

    .nav-title-group .level-title {
        font-size: 1rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .phase-indicator {
        gap: 8px;
    }

    .phase-labels {
        gap: 6px;
    }

    .phase-labels .phase-label:first-child,
    .phase-labels .phase-label:nth-child(2),
    .phase-labels .phase-label:last-child {
        justify-self: auto;
        text-align: center;
    }

    .hotspot {
        width: 32px;
        height: 32px;
    }

    .hotspot-dot {
        inset: 9px;
    }

    .hotspot-card {
        grid-template-columns: auto 1fr;
        align-items: start;
    }

    .hotspot-card-body {
        display: block;
    }

    .hotspot-card-title,
    .hotspot-card-desc {
        white-space: normal;
    }

    .scene {
        padding: 12px 14px;
    }

    .option-card {
        padding: 11px 12px;
    }

    .feedback-modal-box {
        padding: 16px 14px;
    }

    .achievement-card,
    .performance,
    .process-review {
        padding: 14px 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}