:root {
    color-scheme: light;
    --bg: #eef2f6;
    --surface: #ffffff;
    --surface-muted: #f7f9fb;
    --border: #d8e0e8;
    --border-strong: #b8c4d0;
    --text: #17212b;
    --muted: #607080;
    --primary: #2457d6;
    --primary-dark: #1d46ad;
    --accent: #0b7a75;
    --signal-bg: #0c1117;
    --signal: #35f08b;
    --warning-bg: #fff8dc;
    --warning-border: #ead27c;
    --shadow: 0 14px 38px rgba(23, 33, 43, 0.10);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: Arial, sans-serif;
}

.app-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 24px 0 36px;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 18px;
}

.eyebrow {
    margin: 0 0 4px;
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
}

.student-name {
    display: block;
    margin: 6px 0 0;
    color: var(--primary);
    font-size: 26px;
    font-weight: 900;
    line-height: 1;
    overflow-wrap: anywhere;
}

.student-switch-link {
    width: fit-content;
    text-decoration: none;
}

.student-switch-link:hover,
.student-switch-link:focus-visible {
    text-decoration: underline;
}

h1,
h2,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: 34px;
    line-height: 1.12;
}

h2 {
    margin-bottom: 0;
    font-size: 20px;
    line-height: 1.2;
}

.nav-row {
    display: flex;
    gap: 8px;
    padding: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 14px rgba(23, 33, 43, 0.06);
}

.nav-row a {
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 0 16px;
    border-radius: 6px;
    color: var(--muted);
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
}

.nav-row a:hover,
.nav-row a.active {
    background: var(--primary);
    color: #ffffff;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 16px;
    align-items: start;
}

.progress-page {
    display: grid;
    gap: 16px;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px;
    box-shadow: var(--shadow);
}

.compose-panel,
.output-panel,
.key-panel,
.practice-panel {
    grid-column: 1;
}

.side-stack {
    grid-column: 2;
    grid-row: 1 / span 3;
    display: grid;
    gap: 16px;
}

.section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.panel-meta,
.status-pill,
.volume-value {
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
}

.status-pill {
    padding: 5px 9px;
    background: #e7f5ef;
    color: #146b43;
    border: 1px solid #bfe2d2;
    border-radius: 999px;
}

.status-pill.paused {
    background: #f2f4f7;
    color: var(--muted);
    border-color: var(--border);
}

.status-pill.keyboard {
    background: #e8f1ff;
    color: #1d46ad;
    border-color: #b9cef8;
}

.empty-state {
    margin: 0;
    padding: 18px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--muted);
    font-weight: 800;
}

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

.session-card {
    display: grid;
    gap: 10px;
    padding: 14px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.session-summary,
.session-meta,
.session-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.session-summary {
    justify-content: space-between;
}

.session-summary strong {
    display: block;
    color: var(--primary);
    font-size: 20px;
    line-height: 1.15;
}

.session-summary span,
.session-meta {
    color: var(--muted);
    font-size: 14px;
    font-weight: 800;
}

.session-stats {
    display: flex;
    gap: 8px;
}

.session-stats span {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 0 10px;
    background: #e8f1ff;
    border: 1px solid #b9cef8;
    border-radius: 999px;
    color: var(--primary);
}

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

.session-id {
    display: block;
    width: 100%;
    padding: 8px 10px;
    overflow-wrap: anywhere;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--muted);
}

.session-actions {
    align-items: end;
    flex-wrap: wrap;
}

.session-actions form {
    display: grid;
    grid-template-columns: minmax(120px, 180px) minmax(120px, 170px) auto;
    align-items: end;
    gap: 8px;
}

.session-actions form:last-child {
    grid-template-columns: minmax(120px, 170px) auto;
}

.rhythm-grid {
    display: grid;
    gap: 14px;
}

.rhythm-card {
    display: grid;
    gap: 12px;
    padding: 14px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.rhythm-metrics,
.rhythm-recent {
    display: grid;
    gap: 8px;
}

.rhythm-metrics {
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.rhythm-metrics span,
.rhythm-recent div {
    min-height: 38px;
    padding: 8px 10px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    font-weight: 900;
}

.rhythm-feedback {
    margin: 0;
    color: var(--primary);
    font-size: 18px;
    font-weight: 900;
}

.rhythm-recent {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.rhythm-recent div {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2px 8px;
    align-items: center;
}

.rhythm-recent span {
    grid-column: 1 / -1;
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
}

.rhythm-recent strong,
.rhythm-recent em {
    color: var(--primary);
    font-style: normal;
}

.volume-value {
    color: var(--primary);
    font-size: 18px;
}

label,
.field-label {
    display: block;
    margin-bottom: 7px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

textarea {
    width: 100%;
    min-height: 132px;
    padding: 14px;
    resize: vertical;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    background: var(--surface-muted);
    color: var(--text);
    font: inherit;
    font-size: 24px;
    line-height: 1.35;
}

input[type="text"],
input[type="password"],
select {
    width: 100%;
    min-height: 46px;
    padding: 0 12px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    background: var(--surface-muted);
    color: var(--text);
    font: inherit;
}

textarea:focus,
input[type="text"]:focus,
input[type="password"]:focus,
select:focus-visible,
input[type="range"]:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: 3px solid rgba(36, 87, 214, 0.24);
    outline-offset: 2px;
}

.mode-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
    padding: 4px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.mode-tabs a {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 14px;
    border-radius: 6px;
    color: var(--muted);
    font-size: 16px;
    font-weight: 800;
    text-decoration: none;
}

.mode-tabs a.active {
    background: var(--primary);
    color: #ffffff;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-top: 14px;
}

.inline-form {
    display: inline;
    margin: 0;
}

.button {
    min-height: 42px;
    padding: 0 16px;
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    font: inherit;
    font-size: 16px;
    font-weight: 800;
}

.button.primary {
    background: var(--primary);
    color: #ffffff;
}

.button.primary:hover {
    background: var(--primary-dark);
}

.button.secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border-strong);
}

.button.secondary:hover {
    background: var(--surface-muted);
}

.button.danger-button {
    border-color: #c95c5c;
    color: #8f2424;
}

.button.secondary.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.button:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.full-width {
    width: 100%;
}

.morse-box,
.live-morse,
.expected-morse {
    overflow-wrap: anywhere;
    background: var(--signal-bg);
    color: var(--signal);
    border: 1px solid #1f2933;
    border-radius: 8px;
    font-family: "Courier New", monospace;
    font-weight: 800;
    letter-spacing: 2px;
    line-height: 1.4;
}

.morse-box {
    min-height: 88px;
    padding: 18px;
    font-size: 30px;
}

.readout-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 12px;
}

.live-morse {
    min-height: 72px;
    padding: 15px;
    font-size: 30px;
}

.live-decoded {
    min-height: 72px;
    padding: 15px;
    display: flex;
    align-items: center;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 32px;
    font-weight: 800;
}

.compact-panel {
    box-shadow: 0 8px 22px rgba(23, 33, 43, 0.08);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

input[type="range"] + .button {
    margin-top: 14px;
}

.chip-row,
.letter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip-row span,
.letter-list span {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 10px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 15px;
    font-weight: 800;
}

.letter-list span {
    min-height: 58px;
    padding: 0 18px;
    font-size: 26px;
}

.letter-list strong {
    margin-left: 6px;
    font-family: "Courier New", monospace;
    color: var(--accent);
    font-size: 32px;
}

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

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

.student-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface-muted);
}

.student-row strong {
    display: block;
    color: var(--text);
    font-size: 20px;
}

.student-row span {
    display: block;
    margin-top: 4px;
    color: var(--muted);
    font-weight: 800;
}

.progress-item {
    display: grid;
    gap: 7px;
    padding: 10px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.progress-row,
.progress-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.progress-row strong {
    color: var(--primary);
    font-size: 22px;
}

.progress-row span {
    color: var(--muted);
    font-size: 14px;
    font-weight: 800;
}

.progress-letter-code {
    display: inline-flex;
    align-items: baseline;
    gap: 10px;
}

.progress-letter-code span {
    padding: 3px 7px;
    background: var(--signal-bg);
    border-radius: 6px;
    color: var(--signal);
    font-family: "Courier New", monospace;
    font-size: 18px;
    letter-spacing: 1px;
}

.progress-bar {
    height: 9px;
    overflow: hidden;
    background: #dfe6ee;
    border-radius: 999px;
}

.progress-bar span {
    display: block;
    height: 100%;
    width: 0;
    background: var(--accent);
    border-radius: inherit;
    transition: width 180ms ease;
}

.progress-meta {
    flex-wrap: wrap;
    justify-content: flex-start;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

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

.score-card {
    display: grid;
    gap: 14px;
}

.score-card-wide {
    margin-top: 14px;
}

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

.score-card-wide .score-main {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.score-main div {
    padding: 12px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.score-label {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.score-main strong {
    color: var(--primary);
    font-size: 34px;
    line-height: 1;
}

.score-bar {
    height: 14px;
    overflow: hidden;
    background: #dfe6ee;
    border-radius: 999px;
}

.score-bar span {
    display: block;
    height: 100%;
    width: 0;
    background: var(--accent);
    border-radius: inherit;
    transition: width 180ms ease;
}

.score-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.score-stats span,
.score-goal {
    color: var(--muted);
    font-size: 14px;
    font-weight: 800;
}

.score-goal {
    margin-bottom: 0;
}

.unlock-row {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.unlock-row span {
    min-width: 34px;
    min-height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--signal-bg);
    border: 1px solid #1f2933;
    border-radius: 8px;
    color: var(--signal);
    font-size: 18px;
    font-weight: 900;
}

.overall-unlock-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(220px, 0.8fr);
    gap: 14px;
    align-items: end;
}

.practice-readout {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 12px;
    align-items: stretch;
}

.target-letter {
    min-height: 132px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--primary);
    font-size: 92px;
    font-weight: 900;
    line-height: 1;
}

.expected-morse {
    min-height: 132px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    font-size: 56px;
}

.expected-morse.prompt-placeholder {
    color: #d3e4dc;
    font-family: Arial, sans-serif;
    font-size: 42px;
    letter-spacing: 0;
}

.read-answer-card .target-letter {
    color: var(--muted);
}

.read-answer-area {
    display: grid;
    gap: 12px;
    margin-top: 14px;
}

.read-answer-area[hidden] {
    display: none;
}

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

.read-choice {
    min-height: 64px;
    font-size: 28px;
}

.read-type-row {
    display: grid;
    grid-template-columns: 110px minmax(110px, 160px);
    gap: 10px;
    align-items: center;
}

.letter-answer-input {
    width: 100%;
    min-height: 54px;
    padding: 0 14px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    background: var(--surface-muted);
    color: var(--text);
    font: inherit;
    font-size: 30px;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
}

.feedback-box {
    background: var(--warning-bg);
    border-color: var(--warning-border);
    box-shadow: 0 8px 22px rgba(23, 33, 43, 0.08);
    font-size: 18px;
    font-weight: 800;
    line-height: 1.4;
}

.feedback-box[hidden] {
    display: none;
}

.inline-feedback {
    margin-top: 16px;
    box-shadow: none;
    font-size: 20px;
}

.feedback-box.success {
    background: #e8f7ee;
    border-color: #9cd5b6;
    color: #155f36;
}

.feedback-box.needs-practice {
    background: var(--warning-bg);
    border-color: var(--warning-border);
}

.admin-panel {
    border-color: var(--warning-border);
}

.admin-reset-form {
    display: grid;
    gap: 10px;
    margin-top: 12px;
}

@media (max-width: 900px) {
    .app-header {
        align-items: stretch;
        flex-direction: column;
    }

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

    .progress-list-wide {
        grid-template-columns: 1fr;
    }

    .compose-panel,
    .output-panel,
    .key-panel,
    .practice-panel,
    .side-stack {
        grid-column: 1;
    }

    .side-stack {
        grid-row: auto;
    }
}

@media (max-width: 640px) {
    .app-shell {
        width: min(100% - 20px, 1180px);
        padding-top: 12px;
    }

    h1 {
        font-size: 28px;
    }

    .nav-row {
        width: 100%;
    }

    .nav-row a {
        flex: 1;
        justify-content: center;
    }

    .panel {
        padding: 14px;
    }

    textarea {
        font-size: 20px;
    }

    .morse-box,
    .live-morse {
        font-size: 24px;
    }

    .readout-grid,
    .practice-readout {
        grid-template-columns: 1fr;
    }

    .target-letter {
        min-height: 110px;
        font-size: 74px;
    }

    .expected-morse {
        min-height: 100px;
        font-size: 42px;
    }

    .button,
    .inline-form {
        width: 100%;
    }

    .mode-tabs,
    .choice-grid,
    .read-type-row,
    .score-main,
    .overall-unlock-grid,
    .score-card-wide .score-main {
        grid-template-columns: 1fr;
    }

    .mode-tabs {
        display: grid;
    }
}

/* --- Phase 2: accounts, family, admin ------------------------------- */

.flash-panel {
    padding: 14px 18px;
}

.flash-message {
    margin: 4px 0;
    font-weight: bold;
}

.flash-error {
    color: #a02020;
}

.flash-info {
    color: var(--accent);
}

.flash-unverified {
    color: #8a6d1a;
}

.auth-panel {
    max-width: 460px;
}

.auth-panel label,
.family-form label {
    display: block;
    margin: 12px 0 4px;
    color: var(--muted);
    font-size: 0.9rem;
}

.auth-panel input[type="text"],
.auth-panel input[type="email"],
.auth-panel input[type="password"],
.admin-table input[type="password"],
.panel input[type="text"]:not(.letter-answer-input),
.panel input[type="email"],
.panel input[type="password"] {
    width: 100%;
    max-width: 320px;
    padding: 9px 10px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    font-size: 1rem;
}

.consent-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin: 14px 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.consent-row input {
    margin-top: 3px;
}

.nav-logout {
    border: 1px solid var(--border-strong);
    background: var(--surface-muted);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--muted);
}

.nav-logout:hover {
    color: var(--text);
    border-color: var(--primary);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.admin-table th,
.admin-table td {
    text-align: left;
    padding: 8px 10px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.admin-table th {
    color: var(--muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.admin-table .inline-form {
    display: inline-flex;
    gap: 6px;
    margin: 2px 6px 2px 0;
}

/* --- Phase 4: legal pages, footer ----------------------------------- */

.legal-panel {
    max-width: 720px;
}

.legal-panel h2 {
    margin: 18px 0 6px;
    font-size: 1.05rem;
}

.legal-panel p {
    margin: 6px 0;
    color: var(--muted);
    line-height: 1.55;
}

.site-footer {
    margin-top: 28px;
    text-align: center;
    color: var(--muted);
    font-size: 0.85rem;
}

.site-footer a {
    color: var(--muted);
}