:root {
    --bg: #f6f7f4;
    --surface: #ffffff;
    --surface-2: #eef4f2;
    --text: #17211f;
    --muted: #5f6f6b;
    --border: #d8e0dc;
    --border-strong: #b9c7c2;
    --teal: #0f766e;
    --teal-dark: #115e59;
    --coral: #d85f45;
    --amber: #b7791f;
    --green: #2f855a;
    --red: #c2413a;
    --ink: #101828;
    --shadow: 0 18px 48px rgba(16, 24, 40, .10);
    --shadow-sm: 0 8px 20px rgba(16, 24, 40, .08);
    --radius: 8px;
    --max: 1120px;
    --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
}

body {
    margin: 0;
    background:
        linear-gradient(180deg, rgba(15, 118, 110, .08), rgba(246, 247, 244, 0) 360px),
        var(--bg);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: inherit;
}

button,
select {
    font: inherit;
}

button {
    touch-action: manipulation;
}

.skip-link {
    position: absolute;
    top: 8px;
    left: -999px;
    z-index: 100;
    background: var(--ink);
    color: white;
    padding: 10px 14px;
    border-radius: var(--radius);
}

.skip-link:focus {
    left: 8px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 30;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 14px max(20px, calc((100vw - var(--max)) / 2 + 20px));
    background: rgba(255, 255, 255, .88);
    border-bottom: 1px solid rgba(216, 224, 220, .82);
    backdrop-filter: blur(16px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    min-width: 210px;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius);
    background: var(--teal);
    color: white;
    font-weight: 800;
    font-size: 1.1rem;
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    font-size: 1rem;
}

.brand small {
    color: var(--muted);
    font-size: .78rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav a {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: var(--radius);
    color: var(--muted);
    text-decoration: none;
    font-weight: 700;
    font-size: .92rem;
}

.nav-button {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: white;
    color: var(--teal-dark);
    padding: 8px 12px;
    font-weight: 800;
    cursor: pointer;
}

.user-chip {
    max-width: 170px;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    border-radius: var(--radius);
    background: var(--surface-2);
    color: var(--muted);
    padding: 8px 10px;
    font-weight: 800;
    font-size: .86rem;
}

.nav a:hover,
.nav-button:hover,
.nav a[aria-current="page"] {
    background: var(--surface-2);
    color: var(--teal-dark);
}

main {
    width: min(var(--max), calc(100% - 40px));
    margin: 0 auto;
    padding: 32px 0 48px;
}

.view {
    display: none;
}

.view.is-active {
    display: block;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
    gap: 20px;
    align-items: stretch;
}

.hero-copy,
.quick-panel,
.builder,
.question-panel,
.score-hero,
.section-band {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.hero-copy {
    min-height: 350px;
    padding: clamp(26px, 4vw, 44px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--coral);
    font-size: .78rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0;
}

h1,
h2,
h3,
p {
    overflow-wrap: anywhere;
}

h1 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(2rem, 4vw, 4.4rem);
    line-height: 1.02;
    letter-spacing: 0;
}

h2 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(1.25rem, 2vw, 1.8rem);
    line-height: 1.14;
    letter-spacing: 0;
}

h3 {
    margin: 0;
    color: var(--ink);
    font-size: 1rem;
    letter-spacing: 0;
}

.hero-copy p:not(.eyebrow),
.quick-panel p {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 1.06rem;
    max-width: 70ch;
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.stat-pill {
    display: inline-flex;
    min-height: 40px;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-2);
    color: var(--muted);
    font-weight: 700;
}

.stat-pill strong {
    color: var(--ink);
}

.quick-panel,
.builder {
    padding: 22px;
}

.quick-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 16px;
}

.field {
    display: grid;
    gap: 7px;
    color: var(--muted);
    font-size: .9rem;
    font-weight: 700;
}

.field select,
.field input {
    width: 100%;
    min-height: 46px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: white;
    color: var(--ink);
    padding: 0 12px;
    outline: none;
}

.field select:focus,
.field input:focus {
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, .16);
}

.primary-btn,
.secondary-btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: var(--radius);
    padding: 10px 16px;
    text-decoration: none;
    border: 1px solid transparent;
    font-weight: 800;
    cursor: pointer;
    transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease, background .12s ease;
}

.primary-btn {
    background: var(--teal);
    color: white;
    box-shadow: 0 8px 18px rgba(15, 118, 110, .20);
}

.primary-btn:hover {
    background: var(--teal-dark);
    transform: translateY(-1px);
}

.secondary-btn {
    background: white;
    color: var(--ink);
    border-color: var(--border-strong);
}

.secondary-btn:hover {
    border-color: var(--teal);
    color: var(--teal-dark);
}

.secondary-btn.danger {
    color: var(--red);
}

.secondary-btn.danger:hover {
    border-color: var(--red);
}

.primary-btn:disabled,
.secondary-btn:disabled {
    opacity: .5;
    cursor: not-allowed;
    transform: none;
}

.section-band {
    margin-top: 20px;
    padding: 24px;
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 16px;
    margin-bottom: 18px;
}

.section-head.compact {
    align-items: center;
    margin-bottom: 14px;
}

.source-link {
    flex: none;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 8px 12px;
    color: var(--teal-dark);
    text-decoration: none;
    font-weight: 800;
    font-size: .9rem;
}

.source-link:hover {
    background: var(--surface-2);
}

.blueprint-grid,
.bank-grid,
.study-grid,
.score-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.blueprint-card,
.bank-card,
.study-card,
.score-card,
.history-item,
.review-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: white;
}

.blueprint-card,
.bank-card,
.study-card,
.score-card {
    padding: 16px;
}

.blueprint-card {
    display: grid;
    gap: 12px;
}

.blueprint-card .big {
    font-size: 2rem;
    font-weight: 900;
    color: var(--teal-dark);
    line-height: 1;
}

.blueprint-card p,
.bank-card p,
.study-card p,
.score-card p {
    margin: 0;
    color: var(--muted);
    font-size: .92rem;
}

.builder {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
    align-items: end;
    gap: 14px;
    margin-bottom: 18px;
}

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

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

.bank-card strong {
    display: block;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    border-radius: var(--radius);
    padding: 4px 9px;
    background: var(--surface-2);
    color: var(--teal-dark);
    font-weight: 800;
    font-size: .82rem;
    white-space: nowrap;
}

.quiz-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.quiz-top h1 {
    font-size: clamp(1.5rem, 3vw, 2.7rem);
}

.quiz-actions-top,
.button-row {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    flex-wrap: wrap;
}

.timer {
    min-width: 78px;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    background: #fff7ed;
    border: 1px solid #fed7aa;
    color: #9a3412;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
}

.progress-track {
    width: 100%;
    height: 10px;
    border-radius: 999px;
    background: #dbe7e3;
    overflow: hidden;
    margin: 0 0 16px;
}

.progress-track > div {
    width: 0%;
    height: 100%;
    background: var(--teal);
    border-radius: inherit;
    transition: width .2s ease;
}

.question-panel {
    padding: clamp(20px, 3vw, 32px);
}

.question-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.question-meta span {
    min-height: 30px;
    display: inline-flex;
    align-items: center;
    border-radius: var(--radius);
    padding: 4px 9px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: .8rem;
    font-weight: 800;
}

#questionStem {
    max-width: 78ch;
    font-size: clamp(1.2rem, 2.2vw, 1.75rem);
}

.multi-note {
    margin: 12px 0 0;
    color: var(--amber);
    font-weight: 800;
}

.answers {
    display: grid;
    gap: 10px;
    margin: 22px 0;
}

.answer-option {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 12px;
    align-items: start;
    min-height: 56px;
    padding: 14px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: white;
    cursor: pointer;
}

.answer-option:hover,
.answer-option:focus-within {
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, .12);
}

.answer-option input {
    width: 20px;
    height: 20px;
    margin: 2px 0 0;
    accent-color: var(--teal);
}

.answer-key {
    width: 28px;
    height: 28px;
    display: inline-grid;
    place-items: center;
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--teal-dark);
    font-weight: 900;
}

.answer-copy {
    display: grid;
    gap: 3px;
}

.answer-text {
    color: var(--ink);
}

.feedback {
    margin: 18px 0;
    padding: 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface-2);
}

.feedback.correct {
    border-color: #9ae6b4;
    background: #f0fff4;
}

.feedback.incorrect {
    border-color: #feb2b2;
    background: #fff5f5;
}

.feedback h3 {
    margin-bottom: 8px;
}

.feedback p {
    margin: 8px 0 0;
    color: var(--muted);
}

.correct-list {
    margin: 8px 0 0;
    padding-left: 18px;
    color: var(--ink);
}

.score-hero {
    padding: clamp(24px, 4vw, 42px);
    margin-bottom: 18px;
}

.score-hero h1 {
    color: var(--teal-dark);
}

.score-hero p {
    margin: 10px 0 0;
    color: var(--muted);
}

.score-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 18px;
}

.score-card strong {
    display: block;
    font-size: 1.4rem;
    color: var(--ink);
}

.review-list,
.history-list {
    display: grid;
    gap: 12px;
    margin: 18px 0;
}

.review-item,
.history-item {
    padding: 16px;
}

.review-item.correct {
    border-left: 5px solid var(--green);
}

.review-item.incorrect {
    border-left: 5px solid var(--red);
}

.review-item h3,
.history-item h3 {
    margin-bottom: 8px;
}

.review-item p,
.history-item p {
    margin: 6px 0 0;
    color: var(--muted);
}

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

.study-card ul {
    margin: 12px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

.study-card li + li {
    margin-top: 6px;
}

.admin-summary {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 18px;
}

.admin-metric {
    min-height: 110px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: white;
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.admin-metric span {
    color: var(--muted);
    font-weight: 800;
    font-size: .86rem;
}

.admin-metric strong {
    color: var(--teal-dark);
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1;
}

.admin-create {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
    gap: 12px;
    align-items: end;
}

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

.member-card {
    display: grid;
    gap: 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: white;
    padding: 16px;
}

.member-main,
.member-stats,
.member-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.member-main {
    align-items: center;
    justify-content: space-between;
}

.member-main p {
    margin: 4px 0 0;
    color: var(--muted);
    font-weight: 800;
}

.member-stats {
    color: var(--muted);
    font-size: .86rem;
}

.member-stats span {
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-2);
    padding: 6px 9px;
}

.member-stats strong {
    color: var(--ink);
}

.member-actions {
    align-items: end;
}

.compact-field {
    min-width: 150px;
    flex: 1 1 160px;
}

.password-field {
    min-width: 220px;
    flex: 2 1 220px;
}

.admin-panels {
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: 18px;
    margin-top: 18px;
}

.stat-list {
    display: grid;
    gap: 10px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: white;
    padding: 12px;
}

.stat-row div {
    display: grid;
    gap: 3px;
}

.stat-row div:last-child {
    text-align: right;
}

.stat-row strong {
    color: var(--ink);
}

.stat-row span {
    color: var(--muted);
    font-size: .86rem;
}

.footer {
    width: min(var(--max), calc(100% - 40px));
    margin: 0 auto 36px;
    color: var(--muted);
    font-size: .86rem;
}

.auth-page {
    min-height: 100vh;
}

.auth-main {
    min-height: calc(100vh - 72px);
    display: grid;
    place-items: center;
    padding: 32px 0 54px;
}

.auth-card {
    width: min(480px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: clamp(22px, 4vw, 34px);
}

.auth-card h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
}

.auth-card p {
    margin: 12px 0 0;
    color: var(--muted);
}

.auth-form {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}

.auth-form .primary-btn,
.auth-form .secondary-btn {
    width: 100%;
}

.auth-switch {
    margin: 2px 0 0;
    color: var(--muted);
    text-align: center;
    font-size: .92rem;
}

.auth-switch a {
    color: var(--teal-dark);
    font-weight: 900;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

.setup-form h2 {
    font-size: 1.2rem;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0 2px;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: grid;
    place-items: center;
    padding: 20px;
    background: rgba(16, 24, 40, .58);
}

.modal {
    width: min(460px, 100%);
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 22px;
}

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

.modal-backdrop[hidden],
[hidden] {
    display: none !important;
}

:focus-visible {
    outline: 3px solid rgba(15, 118, 110, .28);
    outline-offset: 2px;
}

@media (max-width: 900px) {
    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .nav {
        justify-content: flex-start;
        width: 100%;
    }

    .hero-grid,
    .builder,
    .admin-create,
    .admin-summary,
    .admin-panels,
    .blueprint-grid,
    .study-grid,
    .score-grid {
        grid-template-columns: 1fr;
    }

    .hero-copy {
        min-height: auto;
    }
}

@media (max-width: 640px) {
    main,
    .footer {
        width: min(100% - 28px, var(--max));
    }

    .topbar {
        padding: 12px 14px;
        min-height: 0;
    }

    .brand {
        min-width: 0;
    }

    .nav a {
        padding: 8px 9px;
        font-size: .86rem;
    }

    .nav-button,
    .user-chip {
        padding: 8px 9px;
        font-size: .82rem;
    }

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

    .quiz-top {
        align-items: flex-start;
        flex-direction: column;
    }

    .quiz-actions-top,
    .button-row {
        justify-content: stretch;
        width: 100%;
    }

    .button-row > *,
    .quiz-actions-top > * {
        flex: 1 1 130px;
    }

    .answer-option {
        grid-template-columns: 24px minmax(0, 1fr);
        padding: 12px;
    }

    .member-actions > *,
    .admin-create > * {
        flex: 1 1 100%;
        width: 100%;
    }

    .stat-row {
        flex-direction: column;
    }

    .stat-row div:last-child {
        text-align: left;
    }
}