/* Lesson Studio — Mission Control Phase 2 Reference Studio shell */

.lesson-studio-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 0;
    min-height: calc(100vh - var(--topbar-h, 80px));
}

.lesson-studio-sidebar {
    border-right: 1px solid rgba(148, 163, 184, 0.35);
    padding: 1.35rem 0.85rem;
}

.lesson-studio-sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0 0 0.25rem;
}

.lesson-studio-badge {
    font-size: 0.75rem;
    color: #64748b;
    margin: 0 0 1rem;
}

.lesson-studio-nav {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.lesson-studio-nav-btn {
    align-items: center;
    display: flex;
    gap: 0.65rem;
    text-align: left;
    border: none;
    background: transparent;
    padding: 0.55rem 0.75rem;
    border-radius: 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    color: inherit;
}

.lesson-studio-nav-btn > span {
    color: #64748b;
    display: inline-flex;
    font-size: 1rem;
    justify-content: center;
    width: 1.1rem;
}

.lesson-studio-nav-btn.active,
.lesson-studio-nav-btn:hover {
    background: rgba(59, 130, 246, 0.12);
}

.lesson-studio-nav-btn.active {
    color: #2563eb;
    font-weight: 650;
    box-shadow: inset 3px 0 0 #3b82f6;
}

.lesson-studio-nav-btn.active > span { color: #2563eb; }

.lesson-studio-nav-btn:focus-visible,
.lesson-studio-inline-btn:focus-visible,
.lesson-studio-inline-link:focus-visible,
.lesson-studio-textarea:focus-visible,
.lesson-studio-search-input:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.45);
    outline-offset: 2px;
}

.lesson-studio-back-link {
    margin-top: 1.5rem;
    font-size: 0.85rem;
}

.lesson-studio-main {
    padding: 1.5rem clamp(1.25rem, 3vw, 2.5rem) 3rem;
    min-width: 0;
}

.lesson-studio-panel {
    margin: 0 auto;
    max-width: 1180px;
}

.lesson-studio-panel[hidden] {
    display: none !important;
}

.lesson-studio-panel-header h1 {
    font-size: clamp(1.55rem, 2.2vw, 2rem);
    font-weight: 700;
    margin: 0 0 0.35rem;
}

#panel-generate .lesson-studio-panel-header {
    align-items: flex-start;
    display: flex;
    justify-content: space-between;
}

.lesson-studio-eyebrow {
    color: #3b82f6;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin: 0 0 0.35rem;
    text-transform: uppercase;
}

.lesson-draft-save-state {
    color: #64748b;
    font-size: 0.8rem;
    padding-top: 0.4rem;
}

.lesson-draft-state-actions {
    align-items: flex-end;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.lesson-draft-undo {
    background: transparent;
    border: 0;
    color: #2563eb;
    cursor: pointer;
    font-size: 0.75rem;
    padding: 0;
    text-decoration: underline;
}

.lesson-creation-tabs {
    background: rgba(148, 163, 184, 0.12);
    border-radius: 0.7rem;
    display: inline-flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
    padding: 0.25rem;
}

.lesson-creation-tab {
    background: transparent;
    border: 0;
    border-radius: 0.5rem;
    color: inherit;
    cursor: pointer;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.55rem 0.85rem;
}

.lesson-creation-tab.active {
    background: #fff;
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.12);
}

.lesson-creation-layout {
    align-items: start;
    display: grid;
    gap: 1.25rem;
    grid-template-columns: minmax(0, 1fr) 300px;
}

.lesson-creation-editor,
.lesson-draft-summary {
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 0.9rem;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.055);
}

.lesson-creation-editor {
    overflow: hidden;
}

.lesson-creation-mode {
    padding: clamp(1.1rem, 2vw, 1.6rem);
}

.lesson-creation-mode[hidden] {
    display: none;
}

.lesson-draft-form fieldset {
    border: 0;
    margin: 0;
    padding: 0 0 1.3rem;
}

.lesson-draft-form fieldset + fieldset {
    border-top: 1px solid rgba(148, 163, 184, 0.25);
    padding-top: 1.3rem;
}

.lesson-draft-form legend,
.lesson-chat-card h2,
.lesson-draft-summary h2,
.lesson-result-card h2 {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.9rem;
}

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

.lesson-draft-form label {
    display: block;
    font-size: 0.8rem;
    font-weight: 650;
    margin-bottom: 0.9rem;
}

.lesson-draft-form label > span {
    color: #64748b;
    float: right;
    font-size: 0.7rem;
    font-weight: 500;
}

.lesson-draft-form input,
.lesson-draft-form textarea {
    background: transparent;
    border: 1px solid rgba(148, 163, 184, 0.5);
    border-radius: 0.65rem;
    box-sizing: border-box;
    color: inherit;
    display: block;
    font: inherit;
    font-size: 0.9rem;
    margin-top: 0.35rem;
    padding: 0.7rem 0.75rem;
    width: 100%;
}

.lesson-input-with-unit {
    align-items: center;
    border: 1px solid rgba(148, 163, 184, 0.5);
    border-radius: 0.65rem;
    display: flex;
    margin-top: 0.35rem;
    padding-right: 0.75rem;
}

.lesson-input-with-unit input {
    border: 0;
    margin: 0;
    min-width: 0;
}

.lesson-input-with-unit > span {
    color: #64748b;
    font-size: 0.75rem;
}

.lesson-draft-form input:focus-visible,
.lesson-draft-form textarea:focus-visible,
.lesson-creation-tab:focus-visible,
.lesson-prompt-chips button:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.38);
    outline-offset: 1px;
}

.lesson-chat-card p {
    color: #64748b;
    font-size: 0.86rem;
    margin: -0.4rem 0 1rem;
}

.lesson-prompt-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: -0.2rem 0 1rem;
}

.lesson-prompt-chips button {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.28);
    border-radius: 999px;
    color: #2563eb;
    cursor: pointer;
    font-size: 0.75rem;
    padding: 0.35rem 0.65rem;
}

.lesson-generation-actions {
    align-items: center;
    border-top: 1px solid rgba(148, 163, 184, 0.28);
    display: flex;
    justify-content: space-between;
    padding: 1rem 1.25rem;
}

.lesson-primary-action {
    align-items: flex-end;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.lesson-primary-action > span {
    color: #64748b;
    font-size: 0.7rem;
}

.lesson-primary-action .btn-primary {
    align-items: center;
    display: inline-flex;
    gap: 0.55rem;
}

.lesson-primary-action .btn-primary:disabled {
    cursor: not-allowed;
    filter: saturate(0.45);
    opacity: 0.55;
}

.lesson-plan-job-status {
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    font-size: 0.85rem;
    padding: 0.8rem 1.25rem;
}

.lesson-plan-job-status.success { color: #15803d; }
.lesson-plan-job-status.error { color: #b91c1c; }

.lesson-draft-summary {
    padding: 1rem;
    position: sticky;
    top: calc(var(--topbar-h, 80px) + 1rem);
}

.lesson-summary-heading {
    align-items: baseline;
    display: flex;
    justify-content: space-between;
}

.lesson-summary-heading span {
    color: #64748b;
    font-size: 0.7rem;
}

.lesson-completeness {
    background: rgba(59, 130, 246, 0.07);
    border-radius: 0.65rem;
    margin: 0 0 0.85rem;
    padding: 0.7rem;
}

.lesson-completeness-copy {
    align-items: center;
    display: flex;
    font-size: 0.72rem;
    justify-content: space-between;
    margin-bottom: 0.45rem;
}

.lesson-completeness-copy span { color: #64748b; }

.lesson-completeness-track {
    background: rgba(148, 163, 184, 0.3);
    border-radius: 999px;
    height: 0.3rem;
    overflow: hidden;
}

.lesson-completeness-track span {
    background: linear-gradient(90deg, #2563eb, #38bdf8);
    border-radius: inherit;
    display: block;
    height: 100%;
    min-width: 0.25rem;
    transition: width 180ms ease;
    width: 50%;
}

.lesson-draft-summary dl { margin: 0; }

.lesson-draft-summary dl div {
    border-top: 1px solid rgba(148, 163, 184, 0.22);
    padding: 0.65rem 0;
}

.lesson-draft-summary dt {
    color: #64748b;
    font-size: 0.7rem;
    margin-bottom: 0.15rem;
}

.lesson-draft-summary dd {
    font-size: 0.85rem;
    font-weight: 600;
    margin: 0;
}

.lesson-summary-empty,
.lesson-summary-note {
    color: #64748b;
    font-size: 0.77rem;
    line-height: 1.45;
}

.lesson-summary-note {
    border-top: 1px solid rgba(148, 163, 184, 0.22);
    margin: 0.5rem 0 0;
    padding-top: 0.75rem;
}

.lesson-result-card {
    border-top: 1px solid rgba(148, 163, 184, 0.25);
    padding: 1.25rem;
}

.lesson-result-card pre {
    font-family: inherit;
    font-size: 0.85rem;
    max-height: 22rem;
    overflow: auto;
    white-space: pre-wrap;
}

@media (prefers-color-scheme: dark) {
    .lesson-creation-tab.active,
    .lesson-creation-editor,
    .lesson-draft-summary {
        background: rgba(30, 41, 59, 0.72);
    }

    .lesson-draft-form input,
    .lesson-draft-form textarea,
    .lesson-studio-textarea {
        background: rgba(15, 23, 42, 0.65);
        color: #f8fafc;
    }

    .lesson-studio-panel-subtitle,
    .lesson-chat-card p,
    .lesson-summary-empty,
    .lesson-summary-note,
    .lesson-draft-summary dt,
    .lesson-draft-save-state {
        color: #a8b3c4;
    }
}

/* The app shell uses a class toggle; mirror system dark mode for both paths. */
.dark .lesson-creation-tab.active,
.dark .lesson-creation-editor,
.dark .lesson-draft-summary {
    background: #171b22;
    border-color: #343b46;
}

.dark .lesson-draft-form input,
.dark .lesson-draft-form textarea,
.dark .lesson-studio-textarea {
    background: #10141a;
    border-color: #414957;
    color: #f8fafc;
}

.dark .lesson-draft-form input::placeholder,
.dark .lesson-draft-form textarea::placeholder,
.dark .lesson-studio-textarea::placeholder {
    color: #7f8a9a;
    opacity: 1;
}

.dark .lesson-studio-panel-subtitle,
.dark .lesson-chat-card p,
.dark .lesson-summary-empty,
.dark .lesson-summary-note,
.dark .lesson-draft-summary dt,
.dark .lesson-draft-save-state,
.dark .lesson-primary-action > span,
.dark .lesson-completeness-copy span,
.dark .lesson-draft-form label > span {
    color: #aab4c3;
}

.dark .lesson-creation-tabs,
.dark .lesson-completeness {
    background: rgba(96, 165, 250, 0.1);
}

.dark .lesson-creation-tab.active {
    color: #f8fafc;
    box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.16), 0 2px 8px rgba(0, 0, 0, 0.2);
}

.dark .lesson-studio-field-label,
.dark .lesson-draft-form label,
.dark .lesson-draft-form legend,
.dark .lesson-draft-summary dd {
    color: #e5eaf1;
}

.dark .lesson-prompt-chips button,
.dark .lesson-draft-undo {
    color: #7dd3fc;
}

@media (max-width: 980px) {
    .lesson-creation-layout { grid-template-columns: 1fr; }
    .lesson-draft-summary { position: static; }
}

@media (max-width: 680px) {
    .lesson-studio-layout { grid-template-columns: 1fr; }
    .lesson-studio-sidebar { border-bottom: 1px solid rgba(148, 163, 184, 0.35); border-right: 0; }
    .lesson-studio-nav { flex-direction: row; overflow-x: auto; }
    .lesson-draft-grid { grid-template-columns: 1fr; gap: 0; }
    #panel-generate .lesson-studio-panel-header { display: block; }
    .lesson-draft-state-actions { align-items: flex-start; margin-bottom: 1rem; }
    .lesson-generation-actions { align-items: stretch; flex-direction: column-reverse; gap: 0.75rem; }
    .lesson-primary-action { align-items: stretch; }
    .lesson-primary-action .btn-primary,
    .lesson-generation-actions > .btn-secondary { justify-content: center; width: 100%; }
}

.lesson-studio-panel-subtitle {
    color: #64748b;
    font-size: 0.9rem;
    margin: 0 0 1.25rem;
}

.lesson-studio-gate-message {
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
}

.lesson-studio-panel.is-auth-gated .lesson-creation-layout,
.lesson-studio-panel.is-auth-gated .lesson-creation-tabs {
    opacity: 0.58;
}

.lesson-studio-panel.is-auth-gated .lesson-creation-layout {
    filter: saturate(0.5);
}

.dark .lesson-studio-gate-message {
    background: rgba(146, 64, 14, 0.22);
    border-color: rgba(251, 191, 36, 0.48);
    color: #fde68a;
}

.lesson-studio-action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.lesson-studio-card {
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 0.75rem;
    padding: 1rem;
}

.lesson-studio-card h3 {
    margin: 0 0 0.35rem;
    font-size: 1rem;
    font-weight: 600;
}

.lesson-studio-card p {
    margin: 0 0 0.85rem;
    font-size: 0.875rem;
    color: #64748b;
}

.lesson-studio-action-btn {
    display: inline-block;
    text-decoration: none;
}

.lesson-studio-status {
    font-size: 0.9rem;
    color: #64748b;
}

.lesson-studio-scope-note {
    border-left: 3px solid rgba(59, 130, 246, 0.55);
    color: #475569;
    font-size: 0.825rem;
    margin: 0 0 1rem;
    padding: 0.25rem 0 0.25rem 0.75rem;
}

.lesson-studio-error {
    background: #fee2e2;
    border: 1px solid #fca5a5;
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.lesson-studio-item-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.lesson-studio-item-list li {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 0.75rem;
    padding: 0.95rem 1rem;
    transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.lesson-studio-item-list li:hover {
    border-color: rgba(59, 130, 246, 0.45);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    transform: translateY(-1px);
}

.lesson-studio-item-list li a {
    font-weight: 600;
    text-decoration: none;
}

.lesson-studio-item-meta {
    font-size: 0.8rem;
    color: #64748b;
    margin-top: 0.25rem;
}

.lesson-studio-item-heading {
    align-items: flex-start;
    display: flex;
    gap: 0.75rem;
    justify-content: space-between;
}

.lesson-studio-state-badge {
    border-radius: 999px;
    flex: 0 0 auto;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
}

.lesson-studio-state-badge.is-complete {
    background: #dcfce7;
    color: #166534;
}

.lesson-studio-state-badge.is-pending {
    background: #fef3c7;
    color: #92400e;
}

.lesson-studio-state-badge.is-failed {
    background: #fee2e2;
    color: #991b1b;
}

.lesson-studio-item-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 0.65rem;
}

.lesson-studio-item-actions .lesson-studio-inline-btn {
    margin-top: 0;
}

.lesson-studio-inline-link {
    display: inline-block;
    font-size: 0.8rem;
    padding: 0.35rem 0.65rem;
    text-decoration: none;
}

.lesson-studio-link-unavailable {
    color: #64748b;
    font-size: 0.78rem;
}

.lesson-studio-activity-message {
    margin: 0 0 0.5rem;
    font-size: 0.9rem;
}

.lesson-studio-field-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    margin: 0 0 0.35rem;
    color: #475569;
}

.lesson-studio-textarea,
.lesson-studio-search-input {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid rgba(148, 163, 184, 0.45);
    border-radius: 0.75rem;
    padding: 0.65rem 0.75rem;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    font-family: inherit;
}

.lesson-studio-inline-btn {
    margin-top: 0.65rem;
    font-size: 0.8rem;
    padding: 0.35rem 0.65rem;
}

.lesson-studio-search-hit {
    border-color: rgba(59, 130, 246, 0.45);
    background: rgba(59, 130, 246, 0.06);
}

@media (prefers-color-scheme: dark) {
    .lesson-studio-state-badge.is-complete {
        background: rgba(22, 101, 52, 0.35);
        color: #bbf7d0;
    }

    .lesson-studio-state-badge.is-pending {
        background: rgba(146, 64, 14, 0.35);
        color: #fde68a;
    }

    .lesson-studio-state-badge.is-failed {
        background: rgba(153, 27, 27, 0.35);
        color: #fecaca;
    }

    .lesson-studio-item-list li { background: rgba(30, 41, 59, 0.5); }
}

.dark .lesson-studio-item-list li,
.dark .lesson-studio-card {
    background: #171b22;
    border-color: #343b46;
}

.dark .lesson-studio-nav-btn.active {
    background: rgba(56, 189, 248, 0.12);
    color: #7dd3fc;
    box-shadow: inset 3px 0 0 #38bdf8;
}

.dark .lesson-studio-nav-btn.active > span { color: #7dd3fc; }

@media (prefers-reduced-motion: reduce) {
    .lesson-completeness-track span,
    .lesson-studio-item-list li {
        transition: none;
    }

    .lesson-studio-item-list li:hover { transform: none; }
}