:root {
    --bg: #f4f2ec;
    --surface: #ffffff;
    --text: #202020;
    --muted: #6f6f6a;
    --line: #ddd9cf;
    --accent: #2b2b2b;
    --radius: 22px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, Arial, Helvetica, sans-serif;
    line-height: 1.5;
}

a { color: inherit; }

.auth-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-shell { width: min(100%, 460px); }

.auth-card,
.course-card,
.empty-state {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px;
}

.brand {
    font-weight: 800;
    letter-spacing: -0.02em;
}

.brand-link { text-decoration: none; }

.eyebrow {
    margin: 28px 0 8px;
    text-transform: uppercase;
    letter-spacing: .12em;
    font-size: .75rem;
    font-weight: 800;
}

h1, h2 {
    letter-spacing: -0.035em;
    line-height: 1.05;
}

h1 { font-size: clamp(2rem, 6vw, 3.6rem); margin: 0 0 14px; }
h2 { margin: 12px 0; }

.muted { color: var(--muted); }

.form {
    margin-top: 28px;
    display: grid;
    gap: 18px;
}

label {
    display: grid;
    gap: 8px;
    font-weight: 700;
}

input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px 15px;
    font: inherit;
    background: #fff;
}

button,
.button {
    border: 0;
    border-radius: 12px;
    padding: 14px 18px;
    background: var(--accent);
    color: #fff;
    font: inherit;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
    display: inline-flex;
    justify-content: center;
}

.alert {
    margin-top: 20px;
    padding: 12px 14px;
    border-radius: 12px;
    background: #f5e8e6;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 20px clamp(20px, 5vw, 64px);
    border-bottom: 1px solid var(--line);
}

.link-button,
.text-link {
    background: none;
    color: var(--text);
    padding: 0;
    text-decoration: none;
    font-weight: 700;
}

.container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 64px 0;
}

.narrow { width: min(760px, calc(100% - 40px)); }

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 36px;
}

.pill {
    display: inline-block;
    padding: 6px 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: .78rem;
    font-weight: 800;
}

.progress {
    height: 9px;
    margin-top: 28px;
    border-radius: 999px;
    background: #e9e6df;
    overflow: hidden;
}

.progress span {
    display: block;
    height: 100%;
    background: var(--accent);
}

.progress-copy {
    color: var(--muted);
    font-size: .9rem;
    margin-bottom: 24px;
}

.lesson-list {
    display: grid;
    gap: 12px;
    margin-top: 40px;
}

.lesson-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 20px;
}

.lesson-row.locked {
    opacity: .48;
}

.lesson-number {
    display: inline-block;
    min-width: 42px;
    color: var(--muted);
    font-size: .82rem;
    font-weight: 800;
}

@media (max-width: 600px) {
    .auth-card { padding: 24px; }
    .container { padding: 42px 0; }
}


.lesson-link {
    text-decoration: none;
    transition: transform .15s ease, border-color .15s ease;
}

.lesson-link:hover {
    transform: translateY(-1px);
    border-color: #bdb8ad;
}

.lesson-state {
    color: var(--muted);
    font-size: .88rem;
    font-weight: 800;
}

.lesson-shell {
    width: min(760px, calc(100% - 40px));
    margin: 0 auto;
    padding: 48px 0 72px;
}

.lesson-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: clamp(24px, 5vw, 48px);
    min-height: 520px;
}

.lesson-intro-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    margin-top: 26px;
}

.lesson-intro-copy {
    max-width: 620px;
    font-size: 1.05rem;
}

.lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    margin: 28px 0;
    color: var(--muted);
    font-size: .9rem;
    font-weight: 700;
}

.lesson-primary {
    min-width: 160px;
}

.lesson-primary:disabled {
    opacity: .45;
    cursor: not-allowed;
}

.lesson-progress-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    color: var(--muted);
    font-size: .82rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.lesson-progress {
    height: 8px;
    margin: 10px 0 34px;
    background: #e9e6df;
    border-radius: 999px;
    overflow: hidden;
}

.lesson-progress span {
    display: block;
    height: 100%;
    background: var(--accent);
    transition: width .2s ease;
}

.question-context {
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #faf9f6;
    margin-bottom: 24px;
    font-weight: 700;
}

.question-title {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    margin: 8px 0 26px;
}

.answer-list {
    display: grid;
    gap: 12px;
}

.answer-option {
    grid-template-columns: 34px 38px 1fr;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: border-color .15s ease, background .15s ease;
}

.answer-option:hover {
    border-color: #bdb8ad;
    background: #faf9f6;
}

.answer-option input {
    width: 18px;
    height: 18px;
    margin: 0;
}

.answer-letter {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    border: 1px solid var(--line);
    border-radius: 9px;
    font-size: .82rem;
    font-weight: 800;
}

.segment-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.segment-option {
    background: #fff;
    color: var(--text);
    border: 1px solid var(--line);
    padding: 12px 14px;
}

.segment-option.selected {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.lesson-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 28px;
}

.feedback {
    margin-top: 24px;
    border-radius: 16px;
    padding: 18px 20px;
    border: 1px solid var(--line);
}

.feedback p {
    margin: 8px 0 0;
}

.feedback-correct {
    background: #eef5ee;
}

.feedback-incorrect {
    background: #f7f1e8;
}

.feedback-error {
    background: #f5e8e6;
}

.result-message {
    max-width: 520px;
    color: var(--muted);
    font-size: 1.08rem;
}

.score-ring {
    width: 128px;
    height: 128px;
    display: grid;
    place-items: center;
    border: 10px solid var(--accent);
    border-radius: 50%;
    margin: 34px 0;
    font-size: 1.5rem;
    font-weight: 800;
}

.result-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

@media (max-width: 600px) {
    .lesson-shell {
        width: min(100% - 24px, 760px);
        padding: 18px 0 40px;
    }

    .lesson-card {
        border-radius: 20px;
        padding: 22px;
    }

    .answer-option {
        grid-template-columns: 24px 32px 1fr;
        padding: 13px;
    }

    .lesson-actions .lesson-primary {
        width: 100%;
    }
}


/* Quality Control UX refinements */
body > .topbar + .lesson-shell {
    display: grid;
    place-items: start center;
}

.lesson-shell {
    width: min(980px, calc(100% - 40px));
    padding: 56px 0 84px;
}

.lesson-card {
    width: min(100%, 860px);
    margin: 0 auto;
    min-height: 560px;
    box-shadow: 0 12px 36px rgba(32, 32, 32, .06);
}

.lesson-intro-layout,
.lesson-result-layout {
    max-width: 680px;
    margin: 0 auto;
}

.lesson-intro-layout {
    text-align: center;
}

.lesson-intro-layout .lesson-meta {
    justify-content: center;
}

.lesson-intro-layout .lesson-primary {
    margin-top: 4px;
}

.answer-option.is-selected {
    border-color: #77736b;
    background: #f6f4ef;
}

.answer-option.answer-correct,
.segment-option.answer-correct {
    border-color: #4f8b5c;
    background: #eaf4ec;
    color: #183a20;
}

.answer-option.answer-wrong,
.segment-option.answer-wrong {
    border-color: #b45a52;
    background: #faecea;
    color: #5a201c;
}

.answer-option .answer-status,
.segment-option .answer-status {
    margin-left: auto;
    font-weight: 900;
    font-size: 1rem;
    min-width: 20px;
    text-align: center;
}

.answer-option.answer-correct .answer-status,
.segment-option.answer-correct .answer-status {
    color: #2f7040;
}

.answer-option.answer-wrong .answer-status,
.segment-option.answer-wrong .answer-status {
    color: #9d3f37;
}

.segment-option {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.segment-option.selected:not(.answer-correct):not(.answer-wrong) {
    background: #2f2f2f;
    color: #fff;
    border-color: #2f2f2f;
    box-shadow: 0 0 0 3px rgba(47, 47, 47, .12);
}

.lesson-actions {
    justify-content: space-between;
    align-items: center;
    gap: 14px;
}

.lesson-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--line);
}

.lesson-secondary:hover {
    border-color: #bdb8ad;
    background: #faf9f6;
}

.feedback-heading {
    display: flex;
    align-items: center;
    gap: 10px;
}

.feedback-icon {
    display: inline-grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    font-weight: 900;
    flex: 0 0 auto;
}

.feedback-correct .feedback-icon {
    background: #d8ecdc;
    color: #2f7040;
}

.feedback-incorrect .feedback-icon {
    background: #f2d9d6;
    color: #9d3f37;
}

.feedback-pop {
    animation: feedback-pop .16s ease-out;
}

@keyframes feedback-pop {
    from { transform: translateY(4px); opacity: .6; }
    to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 600px) {
    .lesson-shell {
        width: min(100% - 24px, 980px);
        padding: 20px 0 44px;
    }

    .lesson-card {
        width: 100%;
    }

    .lesson-intro-layout {
        text-align: left;
    }

    .lesson-intro-layout .lesson-meta {
        justify-content: flex-start;
    }

    .lesson-actions {
        flex-wrap: wrap;
    }

    .lesson-secondary,
    .lesson-actions .lesson-primary {
        width: 100%;
    }
}


/* Answer layout without A/B/C/D labels */
.answer-option {
    grid-template-columns: 24px 1fr 28px;
}

.answer-letter {
    display: none;
}

.selection-hint {
    margin: -8px 0 14px;
    color: var(--muted);
    font-size: .9rem;
    font-weight: 700;
}

.attempt-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin: 6px 0 28px;
    color: var(--muted);
    font-size: .92rem;
    font-weight: 700;
}

.attempt-limit {
    align-self: center;
    color: var(--muted);
    font-size: .9rem;
    font-weight: 700;
}

@media (max-width: 600px) {
    .answer-option {
        grid-template-columns: 24px 1fr 24px;
    }
}


.topbar-actions,
.admin-nav {
    display: flex;
    align-items: center;
    gap: 18px;
}

.admin-container {
    width: min(1180px, calc(100% - 40px));
}

.admin-heading {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 24px;
    margin-bottom: 30px;
}

.admin-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px;
    margin-top: 22px;
}

.admin-panel h2 {
    margin-top: 0;
}

.admin-create-form {
    display: grid;
    grid-template-columns: 1fr 1.2fr 1fr auto;
    gap: 14px;
    align-items: end;
}

.admin-user-list {
    display: grid;
    gap: 12px;
}

.admin-user-row {
    display: grid;
    grid-template-columns: 1.2fr 1fr auto;
    gap: 18px;
    align-items: center;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
}

.admin-user-main,
.admin-user-progress {
    display: grid;
    gap: 4px;
}

.admin-user-main span,
.admin-user-progress {
    font-size: .92rem;
}

.admin-reset {
    white-space: nowrap;
}

.admin-notice {
    margin: 18px 0;
}

@media (max-width: 900px) {
    .admin-create-form {
        grid-template-columns: 1fr;
    }

    .admin-user-row {
        grid-template-columns: 1fr;
    }

    .admin-reset {
        width: 100%;
    }
}

@media (max-width: 600px) {
    .topbar-actions,
    .admin-nav {
        gap: 10px;
    }

    .admin-heading {
        align-items: flex-start;
        flex-direction: column;
    }
}

/* Listening */
.audio-card {
    margin: 6px 0 26px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #faf9f6;
}

.audio-card-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.audio-icon {
    display: inline-grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-size: .72rem;
}

.audio-card audio {
    width: 100%;
    display: block;
}

.transcript {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid rgba(32, 32, 32, .12);
}

.transcript > span {
    display: block;
    margin-bottom: 4px;
    color: var(--muted);
    font-size: .75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.transcript p {
    margin: 0;
    font-weight: 700;
}


.lesson-actions-left {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.lesson-actions-left .lesson-secondary {
    text-decoration: none;
}