:root {
    --bg: #07111f;
    --bg-soft: #0d1d31;
    --panel: rgba(10, 23, 40, 0.82);
    --panel-strong: rgba(16, 31, 52, 0.95);
    --card: rgba(255, 255, 255, 0.92);
    --card-soft: rgba(236, 244, 255, 0.8);
    --text: #12263a;
    --text-soft: #5f7387;
    --light-text: #e8f2ff;
    --accent: #4f8cff;
    --accent-strong: #2458d3;
    --accent-soft: #eaf2ff;
    --success: #14815b;
    --warning: #b7791f;
    --danger: #c03c3c;
    --border: rgba(18, 38, 58, 0.12);
    --shadow: 0 24px 60px rgba(4, 13, 26, 0.26);
    --radius-xl: 30px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Inter, "Segoe UI", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(79, 140, 255, 0.28), transparent 26%),
        radial-gradient(circle at top right, rgba(117, 92, 255, 0.18), transparent 22%),
        linear-gradient(180deg, #08111e 0%, #0d1829 100%);
}

body.teacher-page {
    background:
        radial-gradient(circle at top left, rgba(110, 145, 255, 0.18), transparent 24%),
        linear-gradient(180deg, #0c1524 0%, #121d30 100%);
}

.site-main-nav {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(7, 17, 31, 0.92);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
}

.site-main-nav--teacher {
    background: rgba(12, 21, 36, 0.94);
}

.site-main-nav__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 0;
}

.site-main-nav__brand {
    font-weight: 800;
    color: var(--light-text);
    text-decoration: none;
    letter-spacing: 0.02em;
    font-size: 1.05rem;
}

.site-main-nav__brand:hover {
    color: white;
}

.site-main-nav__links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.site-main-nav__links a {
    text-decoration: none;
    color: rgba(232, 242, 255, 0.88);
    font-weight: 600;
    font-size: 0.92rem;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    transition: background 0.15s ease, border-color 0.15s ease;
}

.site-main-nav__links a:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.site-main-nav__links a[aria-current="page"] {
    background: rgba(79, 140, 255, 0.35);
    border-color: rgba(79, 140, 255, 0.45);
    color: white;
}

.site-main-nav__ext {
    border-style: dashed;
}

.main-menu-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    margin-top: 8px;
}

.main-menu-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 26px;
    border-radius: var(--radius-lg);
    background: var(--card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text);
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.main-menu-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 28px 50px rgba(4, 13, 26, 0.2);
}

.main-menu-card h2 {
    margin: 0;
    font-size: 1.35rem;
}

.main-menu-card p {
    margin: 0;
    color: var(--text-soft);
    flex: 1;
}

.main-menu-card__cta {
    font-weight: 700;
    color: var(--accent-strong);
    margin-top: 4px;
}

.main-menu-card--primary {
    border-color: rgba(79, 140, 255, 0.35);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(234, 242, 255, 0.95));
}

.main-menu-card--secondary {
    border-color: rgba(110, 75, 210, 0.3);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(244, 240, 255, 0.92));
}

.hero-actions--menu {
    margin-top: 22px;
}

.vocab-es {
    margin: 6px 0 0;
    font-size: 0.92rem;
    color: var(--text-soft);
    font-style: italic;
}

.vocab-es strong {
    font-style: normal;
    color: var(--text);
}

a {
    color: inherit;
}

.site-shell {
    width: min(1360px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 64px;
}

.hero,
.lesson-card,
.teacher-card,
.lesson-panel {
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow);
}

.hero {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
    padding: 36px;
    background: linear-gradient(135deg, rgba(42, 96, 216, 0.94), rgba(110, 75, 210, 0.9));
    color: white;
}

.hero::after {
    content: "";
    position: absolute;
    width: 280px;
    height: 280px;
    right: -70px;
    bottom: -110px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
}

.hero > * {
    position: relative;
    z-index: 1;
}

.eyebrow,
.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.eyebrow {
    margin-bottom: 14px;
    background: rgba(255, 255, 255, 0.15);
}

.hero h1,
.page-title {
    margin: 0 0 14px;
    line-height: 1.08;
}

.hero h1 {
    font-size: clamp(2.2rem, 4vw, 3.8rem);
    max-width: min(14ch, 100%);
}

@media (min-width: 768px) {
    .hero h1 {
        max-width: none;
    }
}

.hero p {
    margin: 0;
    max-width: 72ch;
    color: rgba(255, 255, 255, 0.92);
}

.hero-actions,
.action-row,
.mini-grid,
.lesson-grid,
.teacher-grid,
.card-grid,
.practice-grid,
.hub-grid,
.metric-grid {
    display: grid;
    gap: 16px;
}

.hero-actions,
.metric-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    margin-top: 24px;
}

.metric {
    border-radius: 20px;
    padding: 16px 18px;
    background: rgba(255, 255, 255, 0.13);
    border: 1px solid rgba(255, 255, 255, 0.14);
}

.metric span {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.8;
    margin-bottom: 4px;
}

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

.top-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 22px 0 28px;
}

.btn,
button.btn,
.ghost-link {
    appearance: none;
    border: 0;
    border-radius: 14px;
    padding: 14px 18px;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.btn:hover,
.ghost-link:hover {
    transform: translateY(-1px);
}

.btn-primary {
    color: white;
    background: linear-gradient(135deg, #4f8cff 0%, #2458d3 100%);
    box-shadow: 0 12px 24px rgba(36, 88, 211, 0.26);
}

.btn-secondary {
    color: var(--text);
    background: white;
    border: 1px solid var(--border);
}

.btn-soft {
    color: var(--accent-strong);
    background: var(--accent-soft);
    border: 1px solid rgba(79, 140, 255, 0.16);
}

.ghost-link {
    color: white;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.page-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.page-nav a {
    text-decoration: none;
    color: var(--light-text);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 8px 14px;
    font-weight: 600;
    font-size: 0.92rem;
}

@media (min-width: 1000px) {
    .page-nav {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(140px, max-content));
        gap: 8px 10px;
        align-items: stretch;
    }

    .page-nav a {
        text-align: center;
    }
}

.hub-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

@media (min-width: 1200px) {
    .hub-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

/* Lessons / teacher index: wide-screen rows (16:9 friendly) */
.lessons-index {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 8px;
}

.lessons-index__row {
    display: grid;
    grid-template-columns: 72px minmax(160px, 1fr) minmax(240px, 2fr) auto;
    gap: 16px 20px;
    align-items: center;
    padding: 14px 18px;
    background: var(--card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(4, 13, 26, 0.06);
}

.lessons-index__row--head {
    background: rgba(236, 244, 255, 0.85);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-soft);
    box-shadow: none;
}

.lessons-index__num {
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--accent-strong);
}

.lessons-index__title {
    margin: 0;
    font-size: 1.12rem;
    line-height: 1.25;
}

.lessons-index__summary {
    margin: 0;
    font-size: 0.94rem;
    color: var(--text-soft);
    line-height: 1.45;
}

.lessons-index__tags {
    display: block;
    margin-top: 6px;
    font-size: 0.82rem;
    color: var(--accent-strong);
    font-weight: 600;
}

.lessons-index__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-end;
}

.lessons-index__actions .btn {
    padding: 10px 14px;
    font-size: 0.92rem;
    white-space: nowrap;
}

.lessons-section-label {
    margin: 28px 0 12px;
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(232, 242, 255, 0.75);
}

.lessons-section-label:first-of-type {
    margin-top: 12px;
}

@media (max-width: 960px) {
    .lessons-index__row:not(.lessons-index__row--head) {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .lessons-index__row--head {
        display: none;
    }

    .lessons-index__actions {
        justify-content: flex-start;
    }
}

.lesson-card,
.teacher-card,
.lesson-panel {
    border-radius: var(--radius-lg);
    padding: 24px;
    background: var(--card);
}

.teacher-page .teacher-card,
.teacher-page .lesson-panel {
    background: rgba(245, 249, 255, 0.96);
}

.lesson-card h2,
.teacher-card h2,
.lesson-panel h2,
.lesson-panel h3 {
    margin: 0 0 10px;
    line-height: 1.15;
}

.lesson-card p,
.teacher-card p,
.lesson-panel p {
    margin: 0;
    color: var(--text-soft);
}

.lesson-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 14px 0 0;
}

.tag {
    border-radius: 999px;
    padding: 8px 12px;
    background: var(--card-soft);
    color: var(--accent-strong);
    font-size: 0.88rem;
    font-weight: 700;
}

.lesson-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
}

@media (min-width: 1100px) {
    .lesson-grid {
        grid-template-columns: 1.35fr 0.65fr;
        gap: 22px;
    }
}

.teacher-grid,
.card-grid,
.practice-grid,
.mini-grid {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

/* Side-by-side practice tasks on classroom / 16:9 displays */
@media (min-width: 1040px) {
    .practice-grid--cols-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: start;
    }

    .practice-grid--cols-2-wide-first > .task-block:first-child {
        grid-column: 1 / -1;
    }

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

.stack {
    display: grid;
    gap: 18px;
}

.pill {
    background: var(--accent-soft);
    color: var(--accent-strong);
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-soft);
    margin: 0 0 16px;
}

.reading {
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.vocab-list,
.check-list,
.teacher-list,
.dialogue-list,
.prompt-list,
.plain-list {
    margin: 12px 0 0 20px;
    padding: 0;
}

.plain-list li + li,
.vocab-list li + li,
.check-list li + li,
.teacher-list li + li,
.dialogue-list li + li,
.prompt-list li + li {
    margin-top: 8px;
}

.task-block {
    padding: 18px;
    border-radius: var(--radius-md);
    background: #fff;
    border: 1px solid var(--border);
}

.task-block h3 {
    margin: 0 0 10px;
    font-size: 1.05rem;
}

.callout,
.tip {
    margin-top: 14px;
    border-left: 4px solid var(--accent);
    padding: 14px 16px;
    background: var(--accent-soft);
    border-radius: 14px;
}

.muted-box {
    margin-top: 12px;
    padding: 14px 16px;
    background: #f6f8fc;
    border-radius: 14px;
    border: 1px dashed rgba(18, 38, 58, 0.14);
}

.answer-key,
.teacher-only {
    display: none;
}

body.show-answers .answer-key,
body.show-answers .teacher-only {
    display: block;
}

.answer-note {
    display: none;
    margin-top: 14px;
    color: var(--success);
    font-weight: 700;
}

body.show-answers .answer-note {
    display: block;
}

.word-bank {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    align-content: flex-start;
    gap: 8px 10px;
    margin: 12px 0 16px;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(79, 140, 255, 0.07);
    border: 1px solid rgba(79, 140, 255, 0.16);
}

[data-drag-task] .word-bank {
    justify-content: flex-start;
}

.drag-chip {
    border: 1px solid rgba(79, 140, 255, 0.22);
    border-radius: 10px;
    padding: 6px 14px;
    background: white;
    color: var(--accent-strong);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: grab;
    user-select: none;
    line-height: 1.3;
    box-shadow: 0 1px 0 rgba(18, 38, 58, 0.06);
}

.drag-chip.dragging,
.drag-chip.is-selected {
    outline: 2px solid rgba(79, 140, 255, 0.4);
    transform: translateY(-1px);
}

.drag-chip[hidden] {
    display: none;
}

.drop-slot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 5.5rem;
    max-width: 12rem;
    min-height: 2rem;
    margin: 0 3px;
    padding: 3px 10px;
    border-radius: 8px;
    border: 2px dashed rgba(79, 140, 255, 0.35);
    background: rgba(255, 255, 255, 0.85);
    color: var(--accent-strong);
    font-weight: 700;
    font-size: 0.92rem;
    vertical-align: baseline;
    line-height: 1.35;
}

@media (min-width: 960px) {
    [data-drag-task] ol.plain-list {
        column-count: 2;
        column-gap: 2.5rem;
    }

    [data-drag-task] ol.plain-list li {
        break-inside: avoid;
        margin-bottom: 12px;
    }
}

.drop-slot.is-filled {
    border-style: solid;
    background: rgba(79, 140, 255, 0.12);
}

.drop-slot.is-correct {
    border-color: rgba(20, 129, 91, 0.5);
    background: rgba(20, 129, 91, 0.12);
    color: var(--success);
}

.drop-slot.is-wrong {
    border-color: rgba(192, 60, 60, 0.5);
    background: rgba(192, 60, 60, 0.1);
    color: var(--danger);
}

.inline-input {
    width: 9rem;
    max-width: min(9rem, 100%);
    border-radius: 8px;
    border: 1px solid rgba(18, 38, 58, 0.18);
    padding: 6px 10px;
    font: inherit;
    font-size: 0.95rem;
    display: inline-block;
    vertical-align: baseline;
}

@media (min-width: 960px) {
    [data-typed-task] ol.plain-list {
        column-count: 2;
        column-gap: 2.5rem;
    }

    [data-typed-task] ol.plain-list li {
        break-inside: avoid;
        margin-bottom: 10px;
    }
}

.inline-input.is-correct {
    border-color: rgba(20, 129, 91, 0.5);
    background: rgba(20, 129, 91, 0.08);
}

.inline-input.is-wrong {
    border-color: rgba(192, 60, 60, 0.5);
    background: rgba(192, 60, 60, 0.08);
}

.feedback {
    margin-top: 12px;
    font-weight: 700;
}

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

.feedback.warning {
    color: var(--warning);
}

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

.split-header {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    align-items: flex-start;
}

.footer-note {
    margin-top: 20px;
    text-align: center;
    color: rgba(232, 242, 255, 0.72);
    font-size: 0.95rem;
}

.teacher-page .footer-note {
    color: rgba(232, 242, 255, 0.82);
}

.teacher-hero {
    background: linear-gradient(135deg, rgba(28, 59, 119, 0.95), rgba(61, 81, 158, 0.94));
}

.teacher-summary {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    margin-top: 20px;
}

.teacher-box {
    padding: 16px 18px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.teacher-box strong {
    display: block;
    margin-bottom: 6px;
}

.is-hidden {
    display: none;
}

.inbox-shell {
    display: grid;
    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
    gap: 18px;
    margin-top: 18px;
}

.inbox-sidebar,
.inbox-detail {
    border-radius: 18px;
    border: 1px solid var(--border);
    background: #fff;
}

.inbox-sidebar {
    overflow: hidden;
}

.inbox-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    background: #f8fbff;
}

.inbox-toolbar strong {
    font-size: 1rem;
}

.inbox-count {
    color: var(--text-soft);
    font-size: 0.9rem;
}

.email-list {
    display: grid;
}

.email-item {
    width: 100%;
    text-align: left;
    border: 0;
    border-bottom: 1px solid rgba(18, 38, 58, 0.08);
    background: white;
    padding: 16px;
    cursor: pointer;
    transition: background 0.14s ease, border-color 0.14s ease;
}

.email-item:hover,
.email-item.is-active {
    background: #edf4ff;
}

.email-item.is-active {
    border-left: 4px solid var(--accent);
    padding-left: 12px;
}

.email-from-row,
.email-subject-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.email-from-row strong,
.email-subject {
    font-size: 0.95rem;
    color: var(--text);
}

.email-time,
.email-preview {
    color: var(--text-soft);
    font-size: 0.88rem;
}

.email-preview {
    margin-top: 6px;
}

.mail-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.mail-chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
}

.mail-chip.external {
    background: #eef4ff;
    color: #1d4ed8;
}

.mail-chip.internal {
    background: #f2f7f2;
    color: #166534;
}

.mail-chip.urgent {
    background: #fff1f2;
    color: #be123c;
}

.mail-chip.normal {
    background: #fff7ed;
    color: #b45309;
}

.inbox-detail {
    padding: 0;
    overflow: hidden;
}

.email-pane {
    padding: 22px;
}

.email-pane[hidden] {
    display: none;
}

.email-pane-header {
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 18px;
}

.email-pane-header h3 {
    margin: 0 0 8px;
}

.email-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 10px;
    color: var(--text-soft);
    font-size: 0.92rem;
}

.email-body {
    display: grid;
    gap: 14px;
}

.email-body p {
    margin: 0;
}

.inbox-task-list {
    margin: 0 0 0 20px;
    padding: 0;
}

.inbox-task-list li + li {
    margin-top: 8px;
}

.postbox-shell {
    display: grid;
    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
    gap: 18px;
    margin-top: 18px;
}

.postbox-sidebar,
.postbox-card {
    border-radius: 18px;
    border: 1px solid var(--border);
    background: #fff;
}

.postbox-sidebar {
    overflow: hidden;
}

.postbox-main {
    display: grid;
    gap: 18px;
}

.postbox-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    background: #f8fbff;
}

.postbox-list {
    display: grid;
}

.postbox-item {
    width: 100%;
    text-align: left;
    border: 0;
    border-bottom: 1px solid rgba(18, 38, 58, 0.08);
    background: white;
    padding: 16px;
    cursor: pointer;
    transition: background 0.14s ease, border-color 0.14s ease;
}

.postbox-item:hover,
.postbox-item.is-active {
    background: #edf4ff;
}

.postbox-item.is-active {
    border-left: 4px solid var(--accent);
    padding-left: 12px;
}

.postbox-meta-line,
.postbox-subject-line {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.postbox-preview {
    margin-top: 6px;
    color: var(--text-soft);
    font-size: 0.88rem;
}

.postbox-card {
    padding: 22px;
}

.postbox-card h2,
.postbox-card h3 {
    margin: 0 0 10px;
}

.postbox-thread {
    display: grid;
    gap: 16px;
}

.message-bubble {
    padding: 16px 18px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: #f8fbff;
}

.message-bubble.student {
    background: #eef6ff;
    border-color: rgba(79, 140, 255, 0.18);
}

.message-bubble.sender {
    background: #fff;
}

.message-label {
    display: inline-block;
    margin-bottom: 8px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--accent-strong);
}

.composer-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
}

.postbox-textarea {
    width: 100%;
    min-height: 180px;
    border-radius: 14px;
    border: 1px solid rgba(18, 38, 58, 0.18);
    padding: 14px;
    font: inherit;
    resize: vertical;
}

.feedback-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    margin-top: 14px;
}

.feedback-card {
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: #fbfdff;
}

.score-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 88px;
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 700;
    margin-bottom: 12px;
}

.score-badge.success {
    background: rgba(20, 129, 91, 0.12);
    color: var(--success);
}

.score-badge.warning {
    background: rgba(183, 121, 31, 0.12);
    color: var(--warning);
}

.score-badge.error {
    background: rgba(192, 60, 60, 0.12);
    color: var(--danger);
}

.suggestion-list {
    margin: 0 0 0 18px;
    padding: 0;
}

.suggestion-list li + li {
    margin-top: 8px;
}

.postbox-empty {
    color: var(--text-soft);
}

.reply-draft {
    white-space: pre-wrap;
    margin: 0;
    font: inherit;
    color: var(--text);
}

code {
    padding: 2px 6px;
    border-radius: 8px;
    background: rgba(79, 140, 255, 0.1);
    color: #173a7c;
}

@media (max-width: 900px) {
    .site-shell {
        width: min(100%, calc(100% - 24px));
    }

    .hero,
    .lesson-card,
    .teacher-card,
    .lesson-panel {
        padding: 22px;
    }

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

    .inbox-shell {
        grid-template-columns: 1fr;
    }

    .postbox-shell {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero h1 {
        max-width: none;
    }

    .top-actions,
    .lesson-links {
        flex-direction: column;
    }

    .btn,
    button.btn,
    .ghost-link {
        width: 100%;
        text-align: center;
    }

    .drop-slot {
        max-width: 100%;
        margin: 6px 0;
    }

    .inline-input {
        display: block;
        width: 100%;
        max-width: 100%;
        margin: 8px 0;
    }

    [data-drag-task] ol.plain-list,
    [data-typed-task] ol.plain-list {
        column-count: 1;
    }
}

@media print {
    body {
        background: white;
    }

    .site-main-nav,
    .top-actions,
    .page-nav,
    .lesson-links {
        display: none;
    }

    .site-shell {
        width: 100%;
        padding: 0;
    }

    .hero,
    .lesson-card,
    .teacher-card,
    .lesson-panel {
        box-shadow: none;
        background: white;
        color: black;
        border-color: #d9dde5;
    }

    .hero p,
    .footer-note {
        color: #475569;
    }

    .practice-grid--cols-2,
    .workflow-grid {
        grid-template-columns: 1fr;
    }

    [data-drag-task] ol.plain-list,
    [data-typed-task] ol.plain-list {
        column-count: 1;
    }
}