:root {
    --bg: #f6f7f8;
    --surface: #ffffff;
    --surface-soft: #fbfbfc;
    --surface-muted: #f1f3f5;
    --ink: #1f2933;
    --ink-soft: #52606d;
    --ink-muted: #7b8794;
    --line: #d9dee5;
    --line-strong: #c7ced8;
    --accent: #3568d4;
    --accent-soft: #eef3ff;
    --success: #1f8f5f;
    --error: #b84b4b;
    --warning: #d0872e;
    --radius: 18px;
    --radius-sm: 12px;
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.03);
    --shadow-sm: 0 10px 24px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 18px 40px rgba(15, 23, 42, 0.06);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Manrope", "Segoe UI", sans-serif;
}

a {
    color: var(--accent);
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

button,
input,
textarea,
select {
    font: inherit;
}

input,
textarea,
select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 0.78rem 0.95rem;
    background: #fff;
    color: var(--ink);
}

textarea {
    resize: vertical;
}

label {
    display: grid;
    gap: 0.45rem;
    color: var(--ink-soft);
    font-size: 0.95rem;
}

.button,
.ghost-button,
.icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border-radius: 999px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.button {
    padding: 0.8rem 1.15rem;
    background: var(--ink);
    color: #fff;
    box-shadow: var(--shadow-xs);
}

.button:hover {
    background: #111827;
}

.button-secondary {
    background: #fff;
    color: var(--ink);
    border-color: var(--line);
}

.button-danger {
    background: #fff2f2;
    color: var(--error);
    border-color: #f3c6c6;
}

.ghost-button {
    padding: 0.65rem 0.95rem;
    background: #fff;
    color: var(--ink-soft);
    border-color: var(--line);
}

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

.icon-button {
    width: 40px;
    height: 40px;
    padding: 0;
    background: #fff;
    color: var(--ink);
    border-color: var(--line);
    border-style: solid;
}

.user-pill,
.status-pill,
.block-type-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink-soft);
    padding: 0.35rem 0.65rem;
    font-size: 0.78rem;
    font-weight: 700;
}

.status-pill.is-live {
    color: var(--success);
    border-color: rgba(31, 143, 95, 0.24);
    background: rgba(31, 143, 95, 0.08);
}

.notice,
.notice-inline {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 0.95rem 1rem;
    margin-bottom: 1rem;
    background: #fff;
}

.notice.success,
.notice-inline.success {
    border-color: rgba(31, 143, 95, 0.2);
    background: rgba(31, 143, 95, 0.08);
    color: var(--success);
}

.notice.error,
.notice-inline.error {
    border-color: rgba(184, 75, 75, 0.2);
    background: rgba(184, 75, 75, 0.08);
    color: var(--error);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--ink-muted);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.section-copy,
.muted-text,
.meta-line {
    color: var(--ink-muted);
}

.studio-card,
.card,
.hero-card,
.auth-card,
.setup-card,
.course-card,
.empty-card,
.gate-card,
.lesson-article,
.content-section {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-xs);
}

.public-header,
.public-footer,
.public-main {
    width: min(1240px, calc(100% - 40px));
    margin-left: auto;
    margin-right: auto;
}

.public-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.15rem 0;
}

.public-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.public-main {
    margin-bottom: 3rem;
}

.public-footer {
    padding-bottom: 2rem;
    color: var(--ink-muted);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.9rem;
    color: inherit;
}

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: #111827;
    color: #fff;
    font-weight: 800;
    box-shadow: var(--shadow-xs);
}

.brand small {
    color: var(--ink-muted);
}

.hero-card {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.9fr);
    gap: 2rem;
    padding: 2rem;
    margin-bottom: 1.75rem;
}

.hero-card h1 {
    margin: 0.35rem 0 1rem;
    font-size: clamp(2rem, 4vw, 3.35rem);
    line-height: 1.02;
}

.hero-copy {
    font-size: 1.02rem;
    max-width: 62ch;
    color: var(--ink-soft);
}

.hero-panel {
    padding: 1.5rem;
    border-radius: calc(var(--radius) - 4px);
    background: var(--surface-soft);
    border: 1px solid var(--line);
}

.feature-list {
    display: grid;
    gap: 0.75rem;
    margin: 0;
    padding-left: 1rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.course-card,
.empty-card {
    overflow: hidden;
}

.course-card-body,
.empty-card {
    padding: 1.3rem;
}

.course-thumb,
.hero-image {
    width: 100%;
    aspect-ratio: 16 / 8;
    object-fit: cover;
    background: var(--surface-muted);
}

.auth-card,
.setup-card {
    width: min(780px, calc(100% - 40px));
    margin: 3rem auto;
    padding: 2rem;
}

.stack-form,
.form-grid,
.create-course-form {
    display: grid;
    gap: 1rem;
}

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

.full-width,
.full-span {
    grid-column: 1 / -1;
}

.code-preview {
    width: 100%;
    border-radius: var(--radius-sm);
    border: 1px solid var(--line);
    background: #fff;
    padding: 1rem;
    font-family: Consolas, monospace;
}

.app-shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 1.5rem 1rem;
    background: #f7f8fa;
    border-right: 1px solid var(--line);
}

.brand-admin {
    padding: 0.5rem;
    border-radius: 14px;
}

.sidebar-nav {
    display: grid;
    gap: 0.35rem;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 0.75rem 0.9rem;
    border-radius: 12px;
    color: var(--ink-soft);
    border: 1px solid transparent;
}

.sidebar-nav a:hover {
    background: #fff;
    border-color: var(--line);
}

.sidebar-nav a.active {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: rgba(53, 104, 212, 0.12);
}

.sidebar-footer {
    margin-top: auto;
    padding: 1rem;
    border-radius: 14px;
    background: #fff;
    border: 1px solid var(--line);
    color: var(--ink-muted);
    font-size: 0.88rem;
}

.main-panel {
    padding: 1.5rem 1.75rem 2rem;
}

.topbar,
.section-heading,
.inline-actions,
.checkbox-row,
.topbar-actions,
.editor-status-row,
.course-footnote,
.library-controls,
.course-analytics,
.lesson-canvas-header,
.section-canvas-head,
.editor-block-header,
.interactive-item-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
}

.topbar {
    margin-bottom: 1rem;
}

.topbar-copy {
    display: grid;
    gap: 0.1rem;
}

.topbar h1,
.section-heading h2,
.studio-hero h2,
.library-toolbar h2 {
    margin: 0.2rem 0 0;
    font-size: 1.65rem;
}

.topbar-copy h1 {
    font-size: 1.85rem;
}

.studio-overview,
.dashboard-grid {
    display: grid;
    gap: 1rem;
}

.studio-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.5rem;
}

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

.stat-card {
    padding: 1.1rem 1.15rem;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: #fff;
}

.stat-card span {
    color: var(--ink-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.stat-card strong {
    display: block;
    margin-top: 0.45rem;
    font-size: 2rem;
}

.dashboard-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.9fr);
    margin-top: 1rem;
}

.two-column {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.card {
    padding: 1.25rem;
}

.library-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.mini-course-card {
    display: grid;
    gap: 0.8rem;
    padding: 1rem;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
}

.mini-thumb {
    aspect-ratio: 16 / 9;
    border-radius: 14px;
    overflow: hidden;
    display: grid;
    place-items: center;
    background: var(--surface-muted);
    color: var(--ink-muted);
    font-size: 2rem;
    font-weight: 800;
}

.mini-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.mini-course-copy h3 {
    margin: 0.15rem 0 0.45rem;
    font-size: 1rem;
}

.text-link,
.danger-link {
    border: 0;
    background: transparent;
    padding: 0;
    color: var(--accent);
    cursor: pointer;
}

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

.list-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
}

.list-row:last-child {
    border-bottom: 0;
}

.library-toolbar {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.4rem;
    margin-bottom: 1rem;
}

.library-controls {
    min-width: 360px;
}

.library-controls input,
.library-controls select {
    min-width: 180px;
}

.content-library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.library-card {
    display: grid;
    gap: 0;
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
}

.library-thumb {
    height: 172px;
    background: var(--surface-muted);
    display: grid;
    place-items: center;
    color: var(--ink-muted);
    font-size: 2.3rem;
    font-weight: 800;
}

.library-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.library-card-body {
    display: grid;
    gap: 0.8rem;
    padding: 1.2rem;
}

.library-card-body h3 {
    margin: 0;
    font-size: 1.15rem;
}

.library-card-body p {
    margin: 0;
    color: var(--ink-soft);
}

.library-card-meta,
.course-analytics,
.course-footnote {
    flex-wrap: wrap;
    color: var(--ink-muted);
    font-size: 0.84rem;
}

.library-card-actions {
    display: flex;
    gap: 0.8rem;
    padding: 0 1.2rem 1.2rem;
}

.create-course-card {
    margin-top: 1rem;
}

.create-course-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 1rem;
}

.editor-app {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 1.25rem;
}

.editor-sidebar-panel {
    position: sticky;
    top: 1.5rem;
    align-self: start;
    padding: 1rem;
}

.editor-sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.85rem;
}

.editor-outline-list {
    display: grid;
    gap: 0.55rem;
}

.outline-card {
    display: grid;
    grid-template-columns: 34px 1fr;
    gap: 0.75rem;
    align-items: center;
    padding: 0.8rem;
    text-align: left;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
}

.outline-card:hover,
.outline-card.is-active {
    border-color: rgba(53, 104, 212, 0.25);
    background: var(--accent-soft);
}

.outline-index {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--surface-muted);
    font-weight: 800;
}

.outline-copy strong,
.outline-copy small {
    display: block;
}

.outline-copy small {
    margin-top: 0.2rem;
    color: var(--ink-muted);
}

.editor-sidebar-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.editor-sidebar-stats div {
    padding: 0.85rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
}

.editor-sidebar-stats span {
    display: block;
    color: var(--ink-muted);
    font-size: 0.78rem;
}

.editor-sidebar-stats strong {
    display: block;
    margin-top: 0.2rem;
    font-size: 1.2rem;
}

.editor-workspace {
    display: grid;
    gap: 1rem;
}

.editor-course-hero {
    padding: 1.5rem;
}

.status-group,
.editor-toggle-row,
.block-label-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.autosave-indicator {
    color: var(--ink-muted);
    font-size: 0.88rem;
}

.autosave-indicator.is-saving {
    color: var(--warning);
}

.autosave-indicator.is-error {
    color: var(--error);
}

.editor-title-stack {
    display: grid;
    gap: 0.5rem;
    margin: 1rem 0 1.25rem;
}

.inline-text {
    outline: none;
    border: 1px solid transparent;
    border-radius: 12px;
    transition: border-color 0.16s ease, background 0.16s ease;
}

.inline-text:hover,
.inline-text:focus {
    border-color: var(--line-strong);
    background: var(--surface-soft);
}

.inline-title {
    padding: 0.35rem 0.45rem;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.05;
}

.inline-description {
    padding: 0.35rem 0.45rem;
    color: var(--ink-soft);
    font-size: 1.02rem;
    line-height: 1.7;
}

.inline-body {
    min-height: 92px;
    padding: 0.85rem 0.95rem;
    color: var(--ink-soft);
    line-height: 1.7;
}

.field-label {
    display: inline-flex;
    margin-bottom: 0.35rem;
    color: var(--ink-muted);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.course-meta-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.editor-toggle-row {
    margin-bottom: 1rem;
}

.editor-copy-block + .editor-copy-block {
    margin-top: 1rem;
}

.editor-document {
    display: grid;
    gap: 1rem;
}

.lesson-canvas {
    padding: 1.25rem;
}

.lesson-heading,
.section-heading-copy {
    display: grid;
    gap: 0.3rem;
    min-width: 0;
    flex: 1;
}

.lesson-title {
    padding: 0.35rem 0.45rem;
    font-size: 1.55rem;
    font-weight: 800;
}

.lesson-summary,
.section-description {
    padding: 0.35rem 0.45rem;
    color: var(--ink-muted);
    min-height: 42px;
}

.section-stack,
.block-stack {
    display: grid;
    gap: 1rem;
}

.section-stack {
    margin-top: 1rem;
}

.section-canvas {
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-soft);
    padding: 1rem;
}

.section-title {
    padding: 0.3rem 0.45rem;
    font-size: 1.1rem;
    font-weight: 800;
}

.editor-block {
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
    overflow: hidden;
}

.editor-card {
    padding: 1rem;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: #fff;
    margin-bottom: 1rem;
}

.editor-card summary {
    cursor: pointer;
    font-weight: 700;
}

.editor-block-header {
    padding: 0.85rem 0.95rem;
    border-bottom: 1px solid var(--line);
    background: var(--surface-soft);
}

.drag-handle {
    width: 24px;
    color: var(--ink-muted);
    font-weight: 800;
    letter-spacing: 0.08em;
    cursor: grab;
    user-select: none;
}

.lesson-drag-handle {
    align-self: flex-start;
    margin-top: 0.6rem;
}

.block-title-input {
    min-width: 180px;
    width: auto;
    border: 0;
    background: transparent;
    padding: 0.25rem 0.35rem;
    font-weight: 700;
}

.rich-block-shell {
    padding: 0.5rem 0.85rem 0.85rem;
}

.editor-rich-surface {
    min-height: 90px;
}

.editor-rich-surface .ProseMirror {
    outline: none;
    min-height: 90px;
    padding: 0.8rem;
    border-radius: 12px;
}

.editor-rich-surface .ProseMirror:focus {
    background: var(--surface-soft);
}

.editor-rich-surface .ProseMirror p {
    margin: 0.5rem 0;
    line-height: 1.75;
    color: var(--ink);
}

.editor-rich-surface .ProseMirror h1,
.editor-rich-surface .ProseMirror h2,
.editor-rich-surface .ProseMirror h3 {
    margin: 0.75rem 0 0.45rem;
    line-height: 1.2;
}

.editor-rich-surface .ProseMirror table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.editor-rich-surface .ProseMirror td,
.editor-rich-surface .ProseMirror th {
    border: 1px solid var(--line);
    padding: 0.65rem;
}

.editor-rich-surface .ProseMirror blockquote {
    margin: 1rem 0;
    padding-left: 1rem;
    border-left: 3px solid var(--line-strong);
    color: var(--ink-soft);
}

.interactive-items,
.quiz-builder {
    display: grid;
    gap: 0.9rem;
    padding: 0.95rem;
}

.interactive-item,
.quiz-option-editor {
    display: grid;
    gap: 0.6rem;
    padding: 0.85rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
}

.interactive-item-head span {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--ink-soft);
}

.quiz-option-editor {
    grid-template-columns: auto 1fr auto;
    align-items: center;
}

.quiz-correct-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    width: auto;
}

.insert-menu-popover {
    position: absolute;
    z-index: 50;
    width: 220px;
    display: grid;
    gap: 0.3rem;
    padding: 0.6rem;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow-md);
}

.editor-bubble-toolbar {
    width: auto;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem;
}

.editor-bubble-toolbar button {
    padding: 0.55rem 0.7rem;
}

.insert-menu-popover button {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0.7rem 0.8rem;
    border-radius: 12px;
    border: 0;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
}

.insert-menu-popover button:hover {
    background: var(--surface-muted);
}

.insert-menu-title {
    padding: 0.3rem 0.5rem 0.45rem;
    color: var(--ink-muted);
    font-size: 0.76rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.course-layout {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 1.4rem;
}

.course-sidebar {
    position: sticky;
    top: 1rem;
    align-self: start;
    padding: 1.25rem;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.lesson-nav {
    display: grid;
    gap: 0.65rem;
}

.lesson-link {
    display: grid;
    grid-template-columns: 32px 1fr;
    align-items: center;
    gap: 0.7rem;
    padding: 0.75rem;
    border-radius: 14px;
    background: var(--surface-soft);
    color: var(--ink);
}

.lesson-link span {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: #fff;
    border: 1px solid var(--line);
    font-weight: 700;
}

.lesson-link.active {
    background: var(--accent-soft);
}

.course-content {
    display: grid;
    gap: 1rem;
}

.lesson-article,
.gate-card,
.content-section {
    padding: 1.25rem;
}

.content-block {
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
}

.content-block:last-child {
    border-bottom: 0;
}

.rich-text {
    color: var(--ink-soft);
    line-height: 1.8;
}

.interactive-card {
    padding: 0.95rem 1rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
    margin-bottom: 0.75rem;
}

.details-content {
    padding-top: 0.75rem;
    color: var(--ink-soft);
}

.tab-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tab-button {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 999px;
    padding: 0.65rem 0.9rem;
    cursor: pointer;
}

.tab-button.active {
    border-color: rgba(53, 104, 212, 0.2);
    background: var(--accent-soft);
    color: var(--accent);
}

.tab-panel {
    display: none;
    padding: 0.95rem;
    margin-top: 0.8rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
}

.tab-panel.active {
    display: block;
}

.flashcard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.9rem;
}

.flashcard {
    perspective: 1000px;
    min-height: 180px;
    cursor: pointer;
}

.flashcard-inner {
    position: relative;
    min-height: 180px;
    transform-style: preserve-3d;
    transition: transform 0.45s ease;
}

.flashcard.is-flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 1rem;
    border-radius: 18px;
    text-align: center;
    backface-visibility: hidden;
}

.flashcard-front {
    background: #111827;
    color: #fff;
}

.flashcard-back {
    transform: rotateY(180deg);
    background: #fff;
    border: 1px solid var(--line);
}

.quiz-form {
    display: grid;
    gap: 0.8rem;
}

.quiz-option {
    display: flex;
    gap: 0.65rem;
    align-items: flex-start;
    padding: 0.8rem 0.9rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
}

.progress-meter {
    margin: 1.1rem 0;
}

.progress-bar {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: var(--surface-muted);
}

.progress-bar span {
    display: block;
    height: 100%;
    border-radius: 999px;
    background: var(--accent);
}

.panel-footer {
    margin-top: 2rem;
    color: var(--ink-muted);
}

[hidden] {
    display: none !important;
}

@media (max-width: 1180px) {
    .editor-app,
    .course-layout,
    .dashboard-grid,
    .hero-card,
    .app-shell,
    .two-column {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .editor-sidebar-panel,
    .course-sidebar {
        position: static;
    }

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

@media (max-width: 760px) {
    .public-header,
    .topbar,
    .library-toolbar,
    .topbar-actions,
    .section-heading,
    .inline-actions,
    .lesson-canvas-header,
    .section-canvas-head,
    .editor-block-header,
    .editor-status-row,
    .editor-toggle-row,
    .course-footnote,
    .library-card-actions,
    .course-analytics,
    .list-row,
    .public-nav {
        flex-direction: column;
        align-items: stretch;
    }

    .stats-grid,
    .course-meta-grid,
    .create-course-form,
    .form-grid,
    .editor-sidebar-stats {
        grid-template-columns: 1fr;
    }

    .library-controls {
        min-width: 0;
        width: 100%;
        display: grid;
    }

    .quiz-option-editor {
        grid-template-columns: 1fr;
        align-items: stretch;
    }
}

/* ==========================================================================
   v2.0 EDITOR REDESIGN
   Full-page editor layout, settings drawer, hover-only block controls,
   section separators, create-course modal, topbar
   ========================================================================== */

/* ── Editor Body ── */

.editor-body {
    margin: 0;
    background: #f4f5f7;
    color: var(--ink);
    font-family: "Manrope", "Segoe UI", sans-serif;
    min-height: 100vh;
}

/* ── Editor Topbar ── */

.editor-topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    height: 58px;
    padding: 0 1.25rem;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-xs);
    gap: 1rem;
}

.editor-topbar-start,
.editor-topbar-end {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex: 1;
}

.editor-topbar-end {
    justify-content: flex-end;
}

.editor-topbar-center {
    flex-shrink: 0;
}

.editor-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--ink-soft);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.45rem 0.65rem;
    border-radius: 10px;
    transition: background 0.15s ease, color 0.15s ease;
    text-decoration: none;
}

.editor-back-btn:hover {
    background: var(--surface-muted);
    color: var(--ink);
}

.editor-topbar-sep {
    width: 1px;
    height: 20px;
    background: var(--line);
    flex-shrink: 0;
}

.editor-topbar-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--ink);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-pill-sm {
    font-size: 0.82rem;
    padding: 0.3rem 0.6rem;
}

.editor-flash-notice {
    margin: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
}

/* ── Settings Drawer ── */

.settings-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 150;
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(2px);
}

.settings-overlay.is-open {
    display: block;
}

.settings-drawer {
    position: fixed;
    inset: 0 0 0 auto;
    z-index: 160;
    width: min(420px, 92vw);
    background: #fff;
    border-left: 1px solid var(--line);
    box-shadow: -8px 0 32px rgba(15, 23, 42, 0.09);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.settings-drawer.is-open {
    transform: translateX(0);
}

.settings-drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.15rem 1.3rem;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    background: #fff;
    z-index: 1;
}

.settings-drawer-head h2 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 800;
}

.settings-drawer-close {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: transparent;
    cursor: pointer;
    color: var(--ink-soft);
    transition: background 0.15s ease;
}

.settings-drawer-close:hover {
    background: var(--surface-muted);
}

.settings-drawer-body {
    padding: 1.3rem;
    display: grid;
    gap: 1.15rem;
}

.settings-section {
    display: grid;
    gap: 0.85rem;
}

.settings-section-title {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-muted);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--line);
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--line);
}

.toggle-row:last-child {
    border-bottom: 0;
}

.toggle-label {
    display: grid;
    gap: 0.15rem;
}

.toggle-label strong {
    font-size: 0.95rem;
}

.toggle-label span {
    font-size: 0.82rem;
    color: var(--ink-muted);
}

/* iOS-style toggle switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-track {
    position: absolute;
    inset: 0;
    border-radius: 999px;
    background: var(--line-strong);
    transition: background 0.2s ease;
    cursor: pointer;
}

.toggle-track::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    top: 3px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0,0,0,0.18);
    transition: transform 0.2s ease;
}

.toggle-switch input:checked + .toggle-track {
    background: var(--accent);
}

.toggle-switch input:checked + .toggle-track::after {
    transform: translateX(20px);
}

.thumbnail-upload-area {
    display: grid;
    gap: 0.75rem;
}

.thumbnail-preview {
    aspect-ratio: 16 / 7;
    border-radius: var(--radius-sm);
    border: 1px solid var(--line);
    background: var(--surface-muted);
    overflow: hidden;
    display: grid;
    place-items: center;
    color: var(--ink-muted);
    font-size: 0.88rem;
}

.thumbnail-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.thumbnail-upload-actions {
    display: flex;
    gap: 0.65rem;
}

.settings-danger-zone {
    padding: 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(184, 75, 75, 0.2);
    background: rgba(184, 75, 75, 0.04);
}

.settings-danger-zone p {
    margin: 0 0 0.85rem;
    font-size: 0.88rem;
    color: var(--ink-soft);
}

/* ── Full-page Editor App Layout ── */

.editor-page-wrap {
    display: grid;
    grid-template-columns: 268px minmax(0, 1fr);
    height: calc(100vh - 58px);
    overflow: hidden;
}

.editor-sidebar-v2 {
    display: flex;
    flex-direction: column;
    background: #fff;
    border-right: 1px solid var(--line);
    overflow-y: auto;
    padding: 1.1rem 0.85rem;
    gap: 0.35rem;
}

.editor-sidebar-v2-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.9rem;
    padding: 0 0.3rem;
}

.editor-sidebar-v2-head h2 {
    margin: 0;
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--ink-muted);
}

.sidebar-add-lesson-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: transparent;
    color: var(--ink-soft);
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.sidebar-add-lesson-btn:hover {
    background: var(--surface-muted);
    color: var(--ink);
}

.outline-card-v2 {
    display: grid;
    grid-template-columns: 30px 1fr;
    gap: 0.65rem;
    align-items: center;
    width: 100%;
    padding: 0.7rem 0.75rem;
    text-align: left;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.outline-card-v2:hover {
    background: var(--surface-muted);
}

.outline-card-v2.is-active {
    background: var(--accent-soft);
    border-color: rgba(53, 104, 212, 0.15);
}

.outline-num {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 9px;
    background: var(--surface-muted);
    font-weight: 800;
    font-size: 0.82rem;
    color: var(--ink-soft);
    flex-shrink: 0;
}

.outline-card-v2.is-active .outline-num {
    background: rgba(53, 104, 212, 0.12);
    color: var(--accent);
}

.outline-info strong,
.outline-info small {
    display: block;
    text-align: left;
}

.outline-info strong {
    font-size: 0.88rem;
    color: var(--ink);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 160px;
}

.outline-info small {
    font-size: 0.76rem;
    color: var(--ink-muted);
    margin-top: 0.1rem;
}

.editor-canvas-wrap {
    overflow-y: auto;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* ── Inline Title / Description (v2 tweaks) ── */

.editor-title-block {
    padding: 1.75rem 1.75rem 1.25rem;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-xs);
}

.editor-title-block .inline-title {
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    font-weight: 800;
    line-height: 1.06;
}

.editor-title-block .inline-description {
    font-size: 1.02rem;
    color: var(--ink-soft);
    line-height: 1.75;
}

/* ── Lesson Canvas v2 ── */

.lesson-canvas-v2 {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
}

.lesson-canvas-header-v2 {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    padding: 1.25rem 1.35rem 1rem;
    border-bottom: 1px solid var(--line);
}

.lesson-drag-zone {
    padding-top: 0.4rem;
    cursor: grab;
    color: var(--ink-muted);
    opacity: 0;
    transition: opacity 0.15s ease;
    user-select: none;
    font-size: 1.1rem;
    letter-spacing: 0.04em;
}

.lesson-canvas-v2:hover .lesson-drag-zone {
    opacity: 1;
}

.lesson-heading-block {
    flex: 1;
    min-width: 0;
    display: grid;
    gap: 0.3rem;
}

.lesson-title-v2 {
    padding: 0.3rem 0.4rem;
    font-size: 1.45rem;
    font-weight: 800;
    line-height: 1.18;
}

.lesson-summary-v2 {
    padding: 0.3rem 0.4rem;
    color: var(--ink-muted);
    font-size: 0.97rem;
    min-height: 38px;
    line-height: 1.65;
}

.lesson-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity 0.15s ease;
    flex-shrink: 0;
    padding-top: 0.4rem;
}

.lesson-canvas-v2:hover .lesson-header-actions {
    opacity: 1;
}

.lesson-delete-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.75rem;
    border: 1px solid rgba(184, 75, 75, 0.25);
    border-radius: 10px;
    background: transparent;
    color: var(--error);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease;
}

.lesson-delete-btn:hover {
    background: rgba(184, 75, 75, 0.06);
}

.lesson-body-v2 {
    padding: 0;
}

/* ── Section Separators v2 ── */

.section-canvas-v2 {
    padding: 0 1.35rem;
    border-top: 1px solid var(--line);
}

.section-canvas-v2:first-child {
    border-top: 0;
}

.section-head-v2 {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 0 0.6rem;
}

.section-drag-zone {
    padding-top: 0.35rem;
    cursor: grab;
    color: var(--ink-muted);
    opacity: 0;
    transition: opacity 0.15s ease;
    user-select: none;
    font-size: 1rem;
}

.section-canvas-v2:hover .section-drag-zone {
    opacity: 1;
}

.section-title-group {
    flex: 1;
    min-width: 0;
    display: grid;
    gap: 0.2rem;
}

.section-title-v2 {
    padding: 0.25rem 0.4rem;
    font-size: 1.08rem;
    font-weight: 700;
}

.section-description-v2 {
    padding: 0.2rem 0.4rem;
    color: var(--ink-muted);
    font-size: 0.93rem;
    min-height: 32px;
    line-height: 1.65;
}

.section-head-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    opacity: 0;
    transition: opacity 0.15s ease;
    flex-shrink: 0;
    padding-top: 0.3rem;
}

.section-canvas-v2:hover .section-head-actions {
    opacity: 1;
}

.section-action-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.4rem 0.65rem;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: transparent;
    color: var(--ink-soft);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease;
}

.section-action-btn:hover {
    background: var(--surface-muted);
}

.section-action-btn.is-danger {
    border-color: rgba(184, 75, 75, 0.2);
    color: var(--error);
}

.section-action-btn.is-danger:hover {
    background: rgba(184, 75, 75, 0.06);
}

/* ── Block Stack v2 ── */

.block-stack-v2 {
    display: grid;
    gap: 0;
    padding-bottom: 0.75rem;
}

/* ── Editor Block v2 (hover-only controls) ── */

.editor-block-v2 {
    position: relative;
    border-radius: 12px;
    transition: background 0.15s ease;
    margin: 0.2rem 0;
}

.editor-block-v2:hover {
    background: var(--surface-soft);
}

.block-controls-v2 {
    position: absolute;
    top: 0;
    left: -32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    opacity: 0;
    transition: opacity 0.15s ease;
    pointer-events: none;
    padding-top: 0.55rem;
}

.editor-block-v2:hover .block-controls-v2 {
    opacity: 1;
    pointer-events: auto;
}

.block-drag-handle-v2 {
    width: 24px;
    height: 24px;
    display: grid;
    place-items: center;
    cursor: grab;
    color: var(--ink-muted);
    font-size: 1.05rem;
    user-select: none;
    border-radius: 6px;
    transition: background 0.12s ease;
}

.block-drag-handle-v2:hover {
    background: var(--surface-muted);
}

.block-surface {
    padding: 0.55rem 0.65rem;
    min-height: 52px;
}

.block-surface .editor-rich-surface .ProseMirror {
    padding: 0.4rem 0.2rem;
    background: transparent;
}

.block-surface .editor-rich-surface .ProseMirror:focus {
    background: transparent;
}

.block-inline-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.3rem 0.65rem 0.45rem;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.editor-block-v2:hover .block-inline-actions {
    opacity: 1;
}

.block-type-label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.block-delete-btn-v2 {
    border: 0;
    background: transparent;
    padding: 0.25rem 0.45rem;
    color: var(--ink-muted);
    font-size: 0.78rem;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.12s ease, color 0.12s ease;
}

.block-delete-btn-v2:hover {
    background: rgba(184, 75, 75, 0.08);
    color: var(--error);
}

/* ── Interactive block v2 ── */

.interactive-items-v2,
.quiz-builder-v2 {
    display: grid;
    gap: 0.75rem;
    padding: 0.65rem;
}

.interactive-item-v2 {
    display: grid;
    gap: 0.5rem;
    padding: 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
}

.interactive-item-head-v2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.interactive-item-head-v2 span {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--ink-soft);
}

/* ── Add block zone ── */

.add-block-zone {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem;
    margin: 0.35rem 0;
    border: 1.5px dashed var(--line);
    border-radius: 10px;
    cursor: pointer;
    color: var(--ink-muted);
    font-size: 0.84rem;
    font-weight: 600;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
    user-select: none;
}

.add-block-zone:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
}

/* ── Add section footer in lesson ── */

.lesson-add-section-row {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.35rem;
    border-top: 1px solid var(--line);
}

.add-section-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.55rem 1.1rem;
    border: 1.5px dashed var(--line);
    border-radius: 10px;
    background: transparent;
    color: var(--ink-muted);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.add-section-btn:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
}

/* ── Insert menu v2 ── */

.insert-menu-v2 {
    position: absolute;
    z-index: 200;
    width: 240px;
    padding: 0.55rem;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow-md);
    display: grid;
    gap: 0.2rem;
}

.insert-menu-v2-title {
    padding: 0.3rem 0.55rem 0.5rem;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--ink-muted);
    border-bottom: 1px solid var(--line);
    margin-bottom: 0.2rem;
}

.insert-menu-v2 button {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    width: 100%;
    padding: 0.6rem 0.7rem;
    border: 0;
    border-radius: 10px;
    background: transparent;
    color: var(--ink);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: background 0.12s ease;
}

.insert-menu-v2 button:hover {
    background: var(--surface-muted);
}

.insert-menu-v2-icon {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    background: var(--surface-muted);
    flex-shrink: 0;
    font-size: 0.88rem;
}

/* ── Create Course Modal ── */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 300;
    background: rgba(15, 23, 42, 0.35);
    backdrop-filter: blur(3px);
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal-overlay.is-open {
    display: flex;
}

.modal-card {
    width: min(540px, 100%);
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    animation: modal-in 0.22s ease;
}

@keyframes modal-in {
    from { opacity: 0; transform: scale(0.96) translateY(8px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 1.4rem;
    border-bottom: 1px solid var(--line);
}

.modal-head h2 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 800;
}

.modal-close {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: transparent;
    cursor: pointer;
    color: var(--ink-soft);
    font-size: 1.2rem;
    line-height: 1;
    transition: background 0.15s ease;
}

.modal-close:hover {
    background: var(--surface-muted);
}

.modal-body {
    padding: 1.4rem;
    display: grid;
    gap: 1rem;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.7rem;
    padding: 1rem 1.4rem;
    border-top: 1px solid var(--line);
    background: var(--surface-soft);
}

/* ── Library toolbar v2 ── */

.library-toolbar-v2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.3rem 1.4rem;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-xs);
    margin-bottom: 1.25rem;
}

.library-toolbar-v2-left {
    display: grid;
    gap: 0.2rem;
}

.library-toolbar-v2-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ── Responsive overrides for editor ── */

@media (max-width: 1100px) {
    .editor-page-wrap {
        grid-template-columns: 1fr;
        height: auto;
        overflow: visible;
    }

    .editor-sidebar-v2 {
        height: auto;
        border-right: 0;
        border-bottom: 1px solid var(--line);
        flex-direction: row;
        flex-wrap: wrap;
        overflow-y: visible;
        padding: 0.85rem;
    }

    .editor-canvas-wrap {
        height: auto;
        overflow-y: visible;
    }

    .block-controls-v2 {
        left: 0;
        flex-direction: row;
        top: -32px;
    }
}

@media (max-width: 760px) {
    .editor-topbar {
        padding: 0 0.85rem;
        gap: 0.5rem;
    }

    .editor-topbar-title {
        display: none;
    }

    .editor-topbar-sep {
        display: none;
    }

    .settings-drawer {
        width: 100%;
    }
}

/* ═══════════════════════════════════════════════════════════════════
   v2.1 — Screenshot Alignment Pass (Rise 360 fidelity)
   ═══════════════════════════════════════════════════════════════════ */

/* ── Library cards: borderless, hover shadow, whole card = anchor ── */

.library-card {
    display: grid;
    gap: 0;
    overflow: hidden;
    background: #fff;
    border: none;
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.07);
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.18s ease, transform 0.18s ease;
    cursor: pointer;
}

.library-card:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.11);
    transform: translateY(-2px);
    color: inherit;
    text-decoration: none;
}

/* Thumbnail with status badge overlay */
.library-thumb {
    position: relative;
    height: 172px;
    background: linear-gradient(135deg, #d9dee5 0%, #c4cbd5 100%);
    display: grid;
    place-items: center;
    color: var(--ink-muted);
    font-size: 2.3rem;
    font-weight: 800;
    overflow: hidden;
}

.library-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.library-thumb > span:not(.library-status-badge) {
    position: relative;
    z-index: 1;
}

.library-status-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 2;
    padding: 0.22rem 0.6rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    background: rgba(0,0,0,0.45);
    color: #fff;
    backdrop-filter: blur(4px);
}

.library-status-badge.is-live {
    background: rgba(31, 143, 95, 0.88);
    color: #fff;
}

/* Card body */
.library-card-body {
    display: grid;
    gap: 0.5rem;
    padding: 1.1rem 1.2rem 1.15rem;
}

.library-card-body h3 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--ink);
    line-height: 1.3;
}

.library-card-body p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 0.88rem;
    line-height: 1.55;
}

.library-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-top: 0.3rem;
    font-size: 0.8rem;
    color: var(--ink-muted);
}

.library-card-date {
    font-size: 0.78rem;
    color: var(--ink-muted);
}

/* ── Editor canvas: pure white + centered content ── */

.editor-canvas-wrap {
    overflow-y: auto;
    padding: 0;
    background: #fff;
    display: block;
}

.editor-canvas-inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 3rem 2.5rem 6rem;
}

/* ── Course title area: large gray title + accent bar ── */

.editor-title-block {
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    margin-bottom: 2.5rem;
}

.editor-title-block .inline-title {
    font-size: clamp(2.5rem, 5vw, 3.25rem);
    font-weight: 800;
    line-height: 1.05;
    color: #b8c0ca;
    padding: 0.2rem 0;
}

.editor-title-block .inline-title:focus {
    color: var(--ink);
    outline: none;
}

.editor-title-block .inline-description {
    font-size: 1rem;
    color: var(--ink-muted);
    line-height: 1.7;
    padding: 0.15rem 0;
}

.editor-title-accent {
    width: 52px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
    margin: 0.6rem 0 1rem;
}

/* ── Lesson canvases: flat, no card border or shadow ── */

.lesson-canvas-v2 {
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    overflow: visible;
    padding: 0;
    margin-bottom: 2.5rem;
}

.lesson-canvas-header-v2 {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    padding: 0.5rem 0 0.75rem;
    border-bottom: 2px solid var(--line);
    margin-bottom: 0;
}

.lesson-title-v2 {
    padding: 0.2rem 0;
    font-size: 1.35rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--ink);
}

.lesson-summary-v2 {
    padding: 0.2rem 0;
    color: var(--ink-muted);
    font-size: 0.93rem;
    min-height: 30px;
    line-height: 1.65;
}

/* ── Sections: keep top-border separator, tighten padding ── */

.section-canvas-v2 {
    padding: 0;
}

.section-head-v2 {
    padding: 0.85rem 0 0.5rem;
}

/* ── Block surface: tighten to feel like document text ── */

.block-surface {
    border: none;
    border-radius: 0;
    background: transparent;
    padding: 0;
}

.editor-block-v2 {
    padding: 0.25rem 0;
    border-radius: 6px;
    margin: 0.1rem 0;
}

/* ── Add block zone: subtle, document-like ── */

.add-block-zone {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0.75rem 0 0.5rem;
    padding: 0.55rem 1rem;
    border: 1.5px dashed #d0d7df;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: #aab4bf;
    cursor: pointer;
    user-select: none;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
    background: transparent;
}

.add-block-zone:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(53, 104, 212, 0.04);
}

/* ── Insert menu: horizontal dark pill ── */

.insert-menu-dark {
    position: absolute;
    z-index: 300;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 4px 6px;
    background: #1c1e22;
    border-radius: 999px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.35);
}

.insert-menu-dark button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: transparent;
    border: none;
    color: #c8d0db;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease;
    padding: 0;
}

.insert-menu-dark button:hover {
    background: rgba(255,255,255,0.12);
    color: #fff;
}

.insert-menu-dark-sep {
    width: 1px;
    height: 20px;
    background: rgba(255,255,255,0.15);
    margin: 0 4px;
    flex-shrink: 0;
}

/* ── Outline sidebar: flat list items, left-border active ── */

.outline-card-v2 {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 0.55rem;
    align-items: center;
    width: 100%;
    padding: 0.65rem 0.85rem 0.65rem 0.6rem;
    text-align: left;
    border-radius: 0;
    border: none;
    border-left: 3px solid transparent;
    background: transparent;
    cursor: pointer;
    transition: background 0.12s ease, border-color 0.12s ease;
}

.outline-card-v2:hover {
    background: rgba(0,0,0,0.04);
    border-radius: 0;
}

.outline-card-v2.is-active {
    background: rgba(53, 104, 212, 0.06);
    border-left-color: var(--accent);
}

.outline-card-v2.is-active .outline-num {
    background: rgba(53, 104, 212, 0.12);
    color: var(--accent);
}

/* ── Topbar: tighten to 46px ── */

.editor-topbar {
    height: 46px;
    min-height: 46px;
}

/* ── Status pill in topbar (smaller) ── */

.status-pill {
    padding: 0.18rem 0.55rem;
    font-size: 0.72rem;
}

/* ── Library toolbar v2: tighten alignment ── */

.library-toolbar-v2 {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.25rem 0 1.25rem;
    flex-wrap: wrap;
}

.library-toolbar-v2-right {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-wrap: wrap;
}

/* ── Responsive: editor canvas inner at small screens ── */

@media (max-width: 900px) {
    .editor-canvas-inner {
        padding: 2rem 1.5rem 4rem;
    }
}

@media (max-width: 600px) {
    .editor-canvas-inner {
        padding: 1.5rem 1rem 3rem;
    }

    .editor-title-block .inline-title {
        font-size: 2rem;
    }
}