:root {
    --el-bg: #09090b;
    --el-surface: #151515;
    --el-surface-2: #1f1f23;
    --el-primary: #7c3aed;
    --el-success: #22c55e;
    --el-warning: #f59e0b;
    --el-text: #fafafa;
    --el-muted: #a1a1aa;
    --el-border: rgba(255, 255, 255, 0.09);
    --el-font: "Segoe UI", "Be Vietnam Pro", "Noto Sans", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

body.english-experience {
    background: var(--el-bg);
    color: var(--el-text);
    font-family: var(--el-font);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

body.english-experience .app-header {
    display: none;
}

body.english-experience .app-main {
    width: 100%;
    min-height: 100vh;
    margin: 0;
}

body.english-experience a {
    color: inherit;
}

body.english-experience .messages {
    position: fixed;
    z-index: 50;
    left: 14px;
    right: 14px;
    top: 14px;
}

.english-shell {
    width: min(1180px, 100%);
    min-height: 100vh;
    margin: 0 auto;
    padding: 14px 12px 80px;
    display: grid;
    gap: 12px;
    box-sizing: border-box;
}

.home-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 88px;
    gap: 12px;
    align-items: center;
    min-height: 128px;
}

.home-kicker,
.question-meta,
.prompt-label,
.practice-card-stats dt,
.review-item span,
.practice-card span,
.continue-card span,
.streak-card span {
    color: var(--el-muted);
    font-size: 14px;
    font-weight: 800;
}

.home-hero h1 {
    margin-top: 8px;
    max-width: 680px;
    color: var(--el-text);
    font-size: clamp(26px, 6vw, 38px);
    line-height: 1.02;
}

.progress-ring,
.mini-ring {
    --percent: calc(var(--value) * 1%);
    display: grid;
    place-items: center;
    border-radius: 999px;
    background: conic-gradient(var(--el-primary) var(--percent), #27272a 0);
}

.progress-ring {
    width: 88px;
    height: 88px;
}

.progress-ring::before,
.mini-ring::before {
    content: "";
    grid-area: 1 / 1;
    border-radius: inherit;
    background: var(--el-bg);
}

.progress-ring span,
.mini-ring span {
    grid-area: 1 / 1;
    z-index: 1;
    color: var(--el-text);
    font-size: 17px;
    font-weight: 900;
}

.mini-ring {
    width: 46px;
    height: 46px;
    flex: 0 0 auto;
}

.mini-ring::before {
    margin: 6px;
}

.progress-ring::before {
    margin: 10px;
}

.continue-strip,
.streak-card,
.install-panel,
.section-block,
.practice-card,
.question-card,
.answer-result,
.progress-panel {
    border: 1px solid var(--el-border);
    border-radius: 14px;
    background: var(--el-surface);
}

.continue-strip {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 10px;
}

.continue-card,
.install-button,
.ghost-button,
.submit-pill,
.sticky-practice-action a,
.back-link {
    min-height: 52px;
    border: 0;
    border-radius: 12px;
    font: inherit;
    font-size: 14px;
    font-weight: 900;
    cursor: pointer;
    text-decoration: none;
    transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

.continue-card {
    display: grid;
    gap: 4px;
    padding: 12px 14px;
    background: var(--el-primary);
}

.continue-card strong {
    font-size: 17px;
}

.install-button,
.ghost-button,
.back-link {
    padding: 0 16px;
    background: var(--el-surface-2);
    color: var(--el-text);
}

.back-link {
    display: grid;
    place-items: center;
}

.arena-topbar .back-link {
    min-height: 42px;
    padding: 0 14px;
    font-size: 14px;
}

.install-button.is-disabled,
.install-button:disabled {
    opacity: 0.62;
    cursor: default;
}

.install-panel {
    display: grid;
    gap: 14px;
    padding: 16px;
}

.install-panel[hidden] {
    display: none;
}

.install-panel span {
    display: block;
    color: var(--el-muted);
    font-size: 15px;
    font-weight: 800;
}

.install-panel strong {
    display: block;
    margin-top: 4px;
    color: var(--el-text);
    font-size: 22px;
}

.install-panel ol {
    display: grid;
    gap: 8px;
    margin: 0;
    padding-left: 22px;
    color: var(--el-text);
    line-height: 1.4;
}

.continue-card:hover,
.install-button:hover,
.ghost-button:hover,
.submit-pill:hover,
.sticky-practice-action a:hover,
.back-link:hover,
.practice-card:hover {
    transform: scale(1.015);
}

.streak-card {
    display: grid;
    gap: 10px;
    padding: 14px;
}

.summary-grid {
    display: grid;
    gap: 12px;
}

.streak-card strong {
    display: block;
    margin-top: 4px;
    font-size: 24px;
}

.completion-card p {
    margin: 6px 0 0;
    color: var(--el-muted);
    font-size: 15px;
    line-height: 1.35;
}

.streak-track,
.arena-track {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #27272a;
}

.arena-track {
    height: 10px;
}

.streak-track span,
.arena-track i {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--el-success);
}

.section-block {
    padding: 14px;
}

.section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.section-heading h2,
.diff-title {
    margin: 0;
    color: var(--el-text);
    font-size: 19px;
}

.practice-grid,
.review-list {
    display: grid;
    gap: 12px;
}

.practice-card {
    display: grid;
    gap: 12px;
    min-height: 154px;
    padding: 14px;
    text-decoration: none;
}

.practice-card-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.practice-card h2 {
    margin: 6px 0 0;
    color: var(--el-text);
    font-size: 18px;
    line-height: 1.18;
}

.practice-card-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin: 0;
}

.practice-card-stats div {
    min-height: 58px;
    padding: 9px;
    border-radius: 10px;
    background: var(--el-surface-2);
}

.practice-card-stats dt,
.practice-card-stats dd {
    margin: 0;
}

.practice-card-stats dd {
    margin-top: 5px;
    color: var(--el-text);
    font-size: 16px;
    font-weight: 900;
}

.review-item {
    display: grid;
    gap: 8px;
    padding: 14px 0;
    border-bottom: 1px solid var(--el-border);
}

.review-item:last-child {
    border-bottom: 0;
}

.review-item strong {
    color: var(--el-text);
    font-size: 18px;
    line-height: 1.35;
}

.review-item p,
.empty-state {
    margin: 0;
    color: var(--el-muted);
    font-size: 16px;
}

.review-panel {
    max-height: min(520px, 48vh);
    overflow-y: auto;
    scrollbar-width: thin;
}

.review-panel .section-heading {
    position: sticky;
    z-index: 1;
    top: -14px;
    margin: -14px -14px 10px;
    padding: 14px;
    background: var(--el-surface);
}

.sticky-practice-action {
    position: fixed;
    z-index: 30;
    left: 14px;
    right: 14px;
    bottom: 14px;
}

.sticky-practice-action a {
    display: grid;
    place-items: center;
    width: 100%;
    color: #ffffff;
    background: var(--el-primary);
}

.practice-layout {
    height: 100vh;
    height: 100svh;
    min-height: 100vh;
    min-height: 100svh;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
    background: var(--el-bg);
}

@supports (height: 100dvh) {
    .practice-layout {
        height: 100dvh;
        min-height: 100dvh;
    }
}

.arena-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: grid;
    grid-template-columns: minmax(104px, auto) minmax(0, 1fr) minmax(126px, auto);
    gap: 10px;
    align-items: center;
    padding: 8px 14px;
    border-bottom: 1px solid var(--el-border);
    background: rgba(9, 9, 11, 0.9);
    backdrop-filter: blur(16px);
}

.arena-progress {
    display: grid;
    gap: 7px;
}

.arena-progress span,
.arena-topbar strong {
    color: var(--el-muted);
    font-size: 14px;
    font-weight: 900;
}

.arena-stage {
    display: grid;
    align-items: stretch;
    min-height: 0;
    overflow-y: auto;
    padding: 6px 8px 10px;
    scrollbar-width: thin;
}

.question-card {
    width: min(1060px, 100%);
    min-height: 0;
    max-height: 100%;
    margin: 0 auto;
    overflow-y: auto;
    padding: 18px;
    animation: cardIn 140ms ease;
    scrollbar-width: thin;
}

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

.question-meta {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
    font-size: 13px;
}

.question-meta strong {
    color: var(--el-warning);
}

.question-score {
    text-align: right;
    overflow-wrap: anywhere;
}

.question-card h2 {
    margin: 0 0 12px;
    color: var(--el-text);
    font-size: clamp(25px, 3.6vw, 34px);
    line-height: 1.16;
    overflow-wrap: anywhere;
}

.prompt-label {
    margin: -2px 0 12px;
    font-size: 15px;
    line-height: 1.35;
}

.grammar-structure {
    display: grid;
    gap: 7px;
    margin-bottom: 12px;
    padding: 12px;
    border: 1px solid rgba(34, 197, 94, 0.32);
    border-radius: 14px;
    background: rgba(34, 197, 94, 0.08);
}

.grammar-structure span {
    color: #86efac;
    font-size: 13px;
    font-weight: 900;
    text-transform: uppercase;
}

.grammar-structure p {
    margin: 0;
    color: var(--el-text);
    font-size: 16px;
    font-weight: 800;
    line-height: 1.32;
}

.grammar-card h2,
.writing-card h2 {
    font-size: clamp(23px, 3.2vw, 30px);
    line-height: 1.18;
}

.choice-grid {
    display: grid;
    gap: 9px;
}

body.english-experience .choice {
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    min-height: 60px;
    padding: 12px;
    border: 1px solid var(--el-border);
    border-radius: 12px;
    background: #111113;
    color: var(--el-text);
    transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

body.english-experience .choice:hover,
body.english-experience .choice:has(input:checked) {
    border-color: var(--el-primary);
    background: #211536;
    transform: scale(1.005);
}

body.english-experience .choice input {
    width: 19px;
    min-height: 19px;
    accent-color: var(--el-primary);
}

body.english-experience .choice span {
    font-size: 17px;
    font-weight: 800;
    line-height: 1.26;
}

body.english-experience textarea {
    min-height: min(150px, 22svh);
    border-color: var(--el-border);
    border-radius: 14px;
    background: #111113;
    color: var(--el-text);
    font-size: 17px;
    line-height: 1.35;
}

.speaking-card textarea,
.pronunciation-card textarea {
    min-height: min(104px, 16svh);
}

.writing-card textarea {
    min-height: min(128px, 20svh);
}

.practice-actions {
    display: grid;
    margin-top: 12px;
}

.submit-pill {
    min-height: 48px;
    color: #ffffff;
    background: var(--el-primary);
    font-size: 16px;
}

.next-now-button {
    width: min(760px, 100%);
    margin: 0 auto;
}

.media-control {
    width: 100%;
    min-height: 44px;
    margin: 0 0 12px;
    border-radius: 12px;
    background: #000000;
}

.media-placeholder {
    display: grid;
    place-items: center;
    gap: 8px;
    width: 100%;
    min-height: min(180px, 30svh);
    margin-bottom: 12px;
    border: 1px solid var(--el-border);
    border-radius: 14px;
    color: inherit;
    background:
        linear-gradient(135deg, rgba(124, 58, 237, 0.22), transparent),
        #050506;
    cursor: pointer;
    font: inherit;
}

.media-placeholder span {
    color: var(--el-muted);
    font-size: 15px;
    font-weight: 900;
}

.media-placeholder strong {
    color: var(--el-text);
    font-size: 24px;
}

.listen-orb {
    display: grid;
    place-items: center;
    width: 92px;
    height: 92px;
    margin: 0 auto 12px;
    border-radius: 999px;
    color: #ffffff;
    font-size: 18px;
    font-weight: 900;
    border: 0;
    background: radial-gradient(circle, #8b5cf6, var(--el-primary));
    box-shadow: 0 0 0 7px rgba(124, 58, 237, 0.13);
    cursor: pointer;
}

.pronunciation-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    margin-bottom: 12px;
    padding: 12px;
    border: 1px solid var(--el-border);
    border-radius: 14px;
    background: #111113;
}

.pronunciation-copy {
    display: grid;
    gap: 10px;
    min-width: 0;
}

.pronunciation-copy div {
    display: grid;
    gap: 5px;
}

.pronunciation-panel span {
    color: var(--el-muted);
    font-size: 13px;
    font-weight: 900;
}

.pronunciation-panel strong {
    color: var(--el-text);
    font-size: clamp(28px, 5vw, 40px);
    line-height: 1.02;
    overflow-wrap: anywhere;
}

.pronunciation-panel p {
    margin: 0;
    color: var(--el-text);
    font-size: 15px;
    line-height: 1.32;
}

.pronunciation-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    align-items: stretch;
}

.pronunciation-actions .listen-orb {
    grid-column: 1 / -1;
    width: 100%;
    height: auto;
    min-height: 52px;
    margin: 0;
    border-radius: 999px;
    box-shadow: none;
}

.sound-button {
    min-height: 48px;
    border: 1px solid rgba(124, 58, 237, 0.6);
    border-radius: 12px;
    background: rgba(124, 58, 237, 0.18);
    color: var(--el-text);
    cursor: pointer;
    font: inherit;
    font-size: 15px;
    font-weight: 900;
}

.start-practice-button.is-playing,
.start-practice-button.is-recording {
    background: radial-gradient(circle, #f59e0b, #b45309);
    box-shadow: 0 0 0 8px rgba(245, 158, 11, 0.14);
}

.hold-speak {
    width: 100%;
    min-height: 76px;
    margin-top: 16px;
    border: 1px solid rgba(124, 58, 237, 0.6);
    border-radius: 999px;
    background: rgba(124, 58, 237, 0.2);
    color: var(--el-text);
    font: inherit;
    font-size: 21px;
    font-weight: 900;
    cursor: pointer;
    transition: transform 120ms ease, background 120ms ease;
}

.audio-file-input,
.audio-upload input {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.audio-upload {
    display: grid;
    place-items: center;
    min-height: 44px;
    margin: 0 0 10px;
    border: 1px solid var(--el-border);
    border-radius: 999px;
    background: #111113;
    color: var(--el-text);
    font-size: 14px;
    font-weight: 900;
    cursor: pointer;
}

.hold-speak.is-recording {
    background: rgba(245, 158, 11, 0.24);
    border-color: var(--el-warning);
    transform: scale(1.02);
}

.recorder-status {
    margin: 8px 0 0;
    color: var(--el-muted);
    font-size: 13px;
    line-height: 1.35;
}

.practice-speaking .question-card {
    background: #0f0f12;
}

.answer-result {
    width: min(1060px, 100%);
    margin: 0 auto;
    padding: 18px;
    animation: cardIn 140ms ease;
}

.answer-result strong {
    display: block;
    color: var(--el-text);
    font-size: 30px;
    line-height: 1;
}

.answer-result span {
    display: block;
    margin-top: 10px;
    color: var(--el-muted);
    font-size: 14px;
    font-weight: 900;
}

.answer-result p {
    margin: 8px 0 0;
    color: var(--el-text);
    font-size: 16px;
    line-height: 1.36;
}

.answer-result.is-correct {
    border-color: rgba(34, 197, 94, 0.6);
    background: rgba(34, 197, 94, 0.12);
}

.answer-result.needs-work {
    border-color: rgba(245, 158, 11, 0.6);
    background: rgba(245, 158, 11, 0.12);
}

.result-stack {
    display: grid;
    gap: 12px;
}

.progress-panel {
    width: min(1060px, 100%);
    margin: 0 auto;
    padding: 14px;
}

.progress-panel .progress-line {
    color: var(--el-text);
}

.progress-panel .muted {
    color: var(--el-muted);
}

.bar-track {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #27272a;
}

.bar-fill {
    height: 100%;
    border-radius: inherit;
    background: var(--el-primary);
}

.word-compare {
    width: min(1060px, 100%);
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.transcript-panel {
    width: min(1060px, 100%);
    margin: 0 auto;
    padding: 14px;
    border: 1px solid var(--el-border);
    border-radius: 14px;
    background: #111113;
}

.transcript-panel span {
    display: block;
    color: var(--el-muted);
    font-size: 14px;
    font-weight: 900;
}

.transcript-panel p {
    margin: 8px 0 0;
    color: var(--el-text);
    font-size: 16px;
    line-height: 1.35;
}

.diff-title {
    width: min(1060px, 100%);
    margin: 0 auto;
}

.word-chip {
    min-height: 40px;
    padding: 8px 10px;
    border-radius: 10px;
    background: var(--el-surface);
    color: var(--el-text);
    font-size: 16px;
    font-weight: 900;
}

.word-chip strong,
.word-chip em {
    display: block;
    font-style: normal;
}

.word-chip em {
    margin-top: 4px;
    color: var(--el-muted);
    font-size: 12px;
}

.word-chip.correct {
    color: var(--el-success);
}

.word-chip.close {
    color: var(--el-warning);
}

.word-chip.retry {
    color: #f87171;
}

@media (min-width: 760px) {
    .english-shell {
        padding: 30px 26px 104px;
    }

    .summary-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .practice-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .question-card {
        width: min(1120px, calc(100% - 28px));
        min-height: 0;
        padding: 24px;
    }

    .answer-result,
    .progress-panel,
    .transcript-panel,
    .word-compare,
    .diff-title {
        width: min(1120px, calc(100% - 28px));
    }

    .question-card h2 {
        font-size: 34px;
    }

    .grammar-card h2,
    .writing-card h2 {
        font-size: 32px;
    }

    .prompt-label {
        font-size: 16px;
    }

    .question-meta {
        font-size: 14px;
    }

    body.english-experience .choice {
        min-height: 66px;
        padding: 14px;
    }

    body.english-experience .choice span {
        font-size: 18px;
    }

    body.english-experience textarea {
        min-height: min(160px, 22svh);
        font-size: 18px;
    }

    .media-control {
        min-height: 46px;
    }

    .media-placeholder {
        min-height: min(190px, 30svh);
    }

    .listen-orb {
        width: 104px;
        height: 104px;
        font-size: 19px;
    }

    .hold-speak {
        min-height: 86px;
        font-size: 22px;
    }

    .audio-upload {
        min-height: 46px;
        font-size: 14px;
    }

    .submit-pill,
    .sound-button {
        min-height: 50px;
        font-size: 16px;
    }

    .pronunciation-panel {
        grid-template-columns: minmax(0, 1fr) minmax(180px, 240px);
        align-items: stretch;
    }

    .pronunciation-actions {
        grid-template-columns: 1fr;
    }

    .pronunciation-actions .listen-orb {
        min-height: 50px;
    }

    .pronunciation-panel strong {
        font-size: 40px;
    }

    .choice-grid {
        gap: 10px;
    }
}

@media (min-width: 1080px) {
    .practice-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .home-hero {
        min-height: 150px;
    }

    .arena-topbar {
        padding: 10px 18px;
    }

    .arena-stage {
        padding: 8px 12px 12px;
    }

    .question-card {
        width: min(1220px, calc(100% - 56px));
        min-height: 0;
        padding: 28px;
    }

    .answer-result,
    .progress-panel,
    .transcript-panel,
    .word-compare,
    .diff-title {
        width: min(1220px, calc(100% - 56px));
    }

    .question-card h2 {
        font-size: 36px;
    }

    .grammar-card h2,
    .writing-card h2 {
        font-size: 34px;
    }

    .media-placeholder {
        min-height: min(200px, 30svh);
    }

    .listen-orb {
        width: 108px;
        height: 108px;
        font-size: 20px;
    }

    .choice-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .sticky-practice-action {
        left: 50%;
        width: min(520px, calc(100% - 28px));
        transform: translateX(-50%);
    }
}

@media (max-width: 520px) {
    .continue-strip {
        grid-template-columns: 1fr;
    }

    .home-hero {
        grid-template-columns: 1fr;
    }

    .progress-ring {
        width: 96px;
        height: 96px;
    }

    .review-panel {
        max-height: 420px;
    }

    .arena-topbar {
        grid-template-columns: auto minmax(0, 1fr);
        gap: 6px 8px;
        padding: 6px 8px 8px;
    }

    .arena-topbar .back-link {
        min-height: 38px;
        padding: 0 12px;
        font-size: 13px;
    }

    .arena-progress {
        grid-column: 1 / -1;
        order: 3;
        gap: 6px;
    }

    .arena-progress span {
        font-size: 13px;
    }

    .arena-topbar strong {
        justify-self: end;
        text-align: right;
        font-size: 13px;
    }

    .arena-stage {
        align-items: stretch;
        min-height: 0;
        padding: 5px 5px 8px;
    }

    .question-card,
    .answer-result,
    .progress-panel,
    .transcript-panel {
        border-radius: 12px;
        padding: 14px;
    }

    .question-card {
        width: 100%;
        min-height: 0;
    }

    .question-card h2 {
        font-size: 24px;
        line-height: 1.16;
    }

    .prompt-label {
        font-size: 14px;
    }

    .choice-grid {
        gap: 8px;
    }

    body.english-experience .choice {
        min-height: 56px;
        padding: 10px;
    }

    body.english-experience .choice span {
        font-size: 16px;
    }

    body.english-experience textarea {
        min-height: min(112px, 18svh);
        font-size: 16px;
    }

    .grammar-card h2,
    .writing-card h2 {
        font-size: 22px;
    }

    .grammar-structure p {
        font-size: 15px;
    }

    .media-placeholder {
        min-height: min(150px, 26svh);
    }

    .listen-orb {
        width: 78px;
        height: 78px;
    }

    .pronunciation-panel strong {
        font-size: 28px;
    }

    .hold-speak,
    .submit-pill,
    .sound-button {
        min-height: 46px;
        font-size: 15px;
    }

    .audio-upload {
        min-height: 42px;
        font-size: 13px;
    }

    .practice-card-stats {
        grid-template-columns: 1fr;
    }

    .question-meta {
        flex-wrap: wrap;
    }

    .question-score {
        width: 100%;
        text-align: left;
    }
}