:root {
    --bg-main: #f6f8fb;
    --bg-surface: #ffffff;
    --bg-elevated: rgba(255, 255, 255, 0.85);
    --text-primary: #0b1220;
    --text-secondary: #6b7280;
    --accent: #1463ff;
    --accent-2: #2dd4bf;
    --border-color: #e3e8f3;
    --shadow-soft: 0 12px 30px rgba(15, 23, 42, 0.08);
    --shadow-strong: 0 30px 60px rgba(15, 23, 42, 0.16);
    --radius-lg: 22px;
    --radius-md: 14px;
    --radius-sm: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Space Grotesk', 'Manrope', sans-serif;
    background: radial-gradient(900px 500px at 10% -10%, rgba(20, 99, 255, 0.18), transparent 60%),
        radial-gradient(900px 500px at 90% -10%, rgba(45, 212, 191, 0.18), transparent 60%),
        linear-gradient(180deg, #f6f8fb 0%, #ffffff 70%);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    height: 100vh;
    overflow: hidden;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    background-image: radial-gradient(rgba(15, 23, 42, 0.05) 1px, transparent 1px);
    background-size: 22px 22px;
    pointer-events: none;
    z-index: 0;
}

.chat-layout {
    display: flex;
    height: 100%;
    position: relative;
    z-index: 1;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-elevated);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 18px;
    backdrop-filter: blur(16px);
}

.sidebar-header .logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.sidebar-header .logo-image { width: 34px; height: 34px; }
.sidebar-header .logo-text { font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: #ffffff;
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.new-chat-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.chat-history {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 4px;
}

.history-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    padding: 0 8px;
    margin-bottom: 8px;
}

.chat-history ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }

.chat-history li {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    border: 1px solid transparent;
    padding: 6px 6px;
}

.chat-history li.active {
    border-color: rgba(20, 99, 255, 0.25);
    background: rgba(20, 99, 255, 0.08);
}

.chat-history li a {
    display: block;
    padding: 8px 10px;
    font-size: 14px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-controls {
    display: flex;
    gap: 6px;
    justify-content: flex-end;
    padding: 0 8px 6px;
}

.history-controls button {
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-secondary);
}

.user-profile {
    display: flex;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    gap: 10px;
}
.sidebar-footer {
    display: grid;
    gap: 10px;
    margin-top: auto;
}

.sidebar-links {
    display: grid;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.sidebar-links a {
    color: inherit;
    text-decoration: none;
}

.sidebar-links a:hover {
    color: var(--accent);
}

/* Workspace */
.chat-workspace {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    min-height: 0;
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
}

.chat-header h2 {
    margin: 0;
    font-size: 18px;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}
    padding: 10px 18px 18px;
}
.report-link {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 10px;
    background: #eef2ff;
    color: #1d4ed8;
    font-weight: 600;
    text-decoration: none;
    font-size: 13px;
}
.report-link:hover {
    background: #e0e7ff;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: white;
    display: grid;
    place-items: center;
    font-weight: 700;
}

.user-name { flex-grow: 1; font-weight: 600; font-size: 14px; }
.settings-btn { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--text-secondary); }

/* Workspace */

.participants .avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 700;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: #ffffff;
    cursor: pointer;
    font-weight: 600;
}
.export-btn {
    background: #eef2ff;
    border-color: #c7d2fe;
}

.mode-switcher {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--text-secondary);
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #e5e7eb;
    transition: .2s;
    border-radius: 999px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .2s;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.switch input:checked + .slider {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.switch input:checked + .slider:before {
    transform: translateX(20px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 999px;
}

.chat-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 14px 3%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
}

#start-screen {
    margin-top: 12px;
    text-align: center;
}

.welcome-logo { width: 90px; height: 90px; margin-bottom: 24px; }

.prompt-starters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.starter-btn {
    padding: 10px 14px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    text-align: left;
    transition: all 0.2s ease;
}

.starter-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.message {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    max-width: 80%;
}

.message-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    flex-shrink: 0;
}

.message.bot .message-avatar {
    width: auto;
    height: auto;
    padding: 6px 10px;
    border-radius: 999px;
    background: #eef2ff;
    color: #111827;
    font-size: 12px;
    line-height: 1.2;
    white-space: nowrap;
}

.message-content {
    padding: 14px 18px;
    border-radius: 16px;
    line-height: 1.6;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(227, 232, 243, 0.8);
    background: #ffffff;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.user .message-content {
    background: linear-gradient(135deg, rgba(20, 99, 255, 0.12), rgba(45, 212, 191, 0.12));
    border-bottom-right-radius: 6px;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: white;
    display: grid;
    place-items: center;
    font-weight: 700;
}

.message.bot .message-content {
    background-color: #ffffff;
    border-bottom-left-radius: 6px;
}

.answer-text {
    white-space: pre-wrap;
    line-height: 1.6;
}

.answer-heading {
    font-weight: 700;
    margin: 10px 0 6px;
}

.message-content mjx-container {
    font-weight: 600;
}

.answer-section {
    padding: 10px 12px;
    border-radius: 12px;
    background: #f8fafc;
    border: 1px solid rgba(226, 232, 240, 0.9);
    margin: 8px 0;
}

.answer-group {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    margin: 8px 0;
}

.answer-group .answer-section {
    margin: 0;
}

.answer-section-title {
    font-weight: 700;
    margin-bottom: 6px;
    color: #1f2937;
}

.answer-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 3px 8px;
    border-radius: 999px;
    background: #e2e8f0;
    color: #0f172a;
    margin-right: 8px;
    font-weight: 700;
}

.answer-tag-examples {
    background: #bae6fd;
    color: #0c4a6e;
}

.answer-tag-tasks {
    background: #fed7aa;
    color: #7c2d12;
}

.answer-tag-answers {
    background: #e5e7eb;
    color: #111827;
}

.answer-answers {
    background: #ede9fe;
    border-color: rgba(167, 139, 250, 0.7);
}

.answer-examples {
    background: #f0f9ff;
    border-color: rgba(125, 211, 252, 0.7);
}

.answer-tasks {
    background: #fff7ed;
    border-color: rgba(253, 186, 116, 0.7);
}

.answer-card {
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid rgba(226, 232, 240, 0.9);
    margin: 10px 0;
    background: #f8fafc;
}

.answer-card-title {
    font-weight: 700;
    margin-bottom: 6px;
}

.answer-brief {
    background: #ecfeff;
    border-color: rgba(103, 232, 249, 0.7);
}

.answer-detail {
    background: #eef2ff;
    border-color: rgba(129, 140, 248, 0.6);
}

.answer-practice {
    background: #fef3c7;
    border-color: rgba(252, 211, 77, 0.7);
}

.answer-title {
    font-weight: 800;
    font-size: 16px;
    margin: 4px 0 8px;
    color: #0f172a;
}

.answer-divider {
    height: 1px;
    background: rgba(148, 163, 184, 0.4);
    margin: 10px 0;
}

@media (max-width: 720px) {
    .answer-group {
        grid-template-columns: 1fr;
    }
}

.answer-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 12px;
    background: #e0f2fe;
    color: #075985;
    font-weight: 600;
    margin-bottom: 6px;
}

.answer-important {
    padding: 8px 10px;
    border-radius: 10px;
    background: #fee2e2;
    border: 1px solid rgba(248, 113, 113, 0.5);
    color: #7f1d1d;
    font-weight: 600;
    margin: 8px 0;
}

.answer-list {
    margin: 6px 0 4px 18px;
    padding: 0;
}

.answer-list li {
    margin: 4px 0;
}

.answer-gap {
    height: 6px;
}

.message-content mjx-container[display="true"] {
    padding: 8px 10px;
    background: #f1f5f9;
    border-radius: 10px;
}

.math-block {
    padding: 10px 12px;
    margin: 8px 0;
    border-radius: 10px;
    background: #f8fafc;
    border: 1px dashed rgba(148, 163, 184, 0.6);
}

.render-card {
    margin: 10px 0;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.35);
    background: #ffffff;
    box-shadow: var(--shadow-soft);
}

.render-title {
    font-weight: 700;
    margin-bottom: 8px;
    color: #0f172a;
}

.render-loading {
    font-size: 13px;
    color: #64748b;
}

.render-error {
    font-size: 13px;
    color: #b91c1c;
}

.render-image {
    width: 100%;
    border-radius: 10px;
    border: 1px solid rgba(226, 232, 240, 0.9);
}
.answer-meta {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-secondary);
}
.sources {
    margin-top: 12px;
    border: 1px solid rgba(226, 232, 240, 0.8);
    border-radius: 10px;
    padding: 8px 10px;
    background: #f8fafc;
}
.sources summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
}
.source-item {
    margin-top: 10px;
}
.source-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.source-text {
    white-space: pre-wrap;
    background: #0f172a;
    color: #e2e8f0;
    padding: 10px;
    border-radius: 8px;
    font-size: 12px;
}

pre {
    background-color: #111827;
    color: #e5e7eb;
    padding: 16px;
    border-radius: 12px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

code { font-size: 14px; }

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
}

.thinking-label {
    font-size: 12px;
    color: #7a8599;
    margin-bottom: 6px;
}

.thinking-timer {
    font-size: 12px;
    color: #94a3b8;
    margin-top: 6px;
}

.typing-indicator span {
    width: 8px; height: 8px;
    background-color: var(--text-secondary);
    border-radius: 999px;
    animation: typingBounce 1s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 80%, 100% { transform: translateY(0); opacity: 0.6; }
    40% { transform: translateY(-4px); opacity: 1; }
}

.chat-input-area {
    border-top: 1px solid var(--border-color);
    padding: 10px 18px 12px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    flex-shrink: 0;
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 700;
    margin-bottom: 6px;
}

.settings-panel {
    padding-bottom: 4px;
}

.settings-toggle {
    border: 1px solid var(--border-color);
    background: #ffffff;
    border-radius: 10px;
    padding: 6px 12px;
    font-size: 12px;
    cursor: pointer;
    color: #334155;
}

.settings-panel.collapsed {
    display: none;
}

.tutor-controls.compact {
    gap: 10px;
    margin-top: 6px;
}

.tutor-controls.compact label {
    min-width: 120px;
}

.simple-footer {
    padding: 8px 22px;
    border-top: 1px solid var(--border-color);
    background: rgba(248, 250, 252, 0.9);
    flex-shrink: 0;
}

.simple-footer p {
    margin: 0;
    font-size: 12px;
    color: var(--text-secondary);
}

.file-preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.file-preview-container img {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    object-fit: cover;
    border: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
    background: #ffffff;
    border-radius: 18px;
    border: 1px solid var(--border-color);
    padding: 12px;
    box-shadow: var(--shadow-soft);
}
.input-wrapper.drag-over {
    border-color: var(--accent);
    background: rgba(56, 189, 248, 0.08);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.tutor-quick-actions {
    gap: 6px;
}

.quick-btn {
    font-size: 12px;
    padding: 6px 10px;
}

#chat-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 14px;
    font-family: 'Space Grotesk', 'Manrope', sans-serif;
    resize: none;
    background: transparent;
}

.attach-btn,
.send-btn {
    border: none;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #ffffff;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    cursor: pointer;
}

.send-btn {
    border-radius: 50%;
}

.disclaimer {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
}

.right-sidebar {
    width: 320px;
    background: var(--bg-elevated);
    border-left: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    backdrop-filter: blur(16px);
}

.right-sidebar .sidebar-header h3 {
    margin: 0;
    font-size: 16px;
}

.tool-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    box-shadow: var(--shadow-soft);
}

.tool-card textarea {
    min-height: 100px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 10px;
    font-family: 'Space Grotesk', 'Manrope', sans-serif;
}

.tool-card button {
    border: none;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    padding: 10px 14px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
}

@media (max-width: 1200px) {
    .chat-container { padding: 12px 3%; }
    .right-sidebar { display: none; }
}

@media (max-width: 1100px) {
    .share-btn { padding: 8px 10px; }
    .share-btn-text { display: none; }
    .header-actions { gap: 10px; }
}

@media (max-width: 980px) {
    .chat-layout { flex-direction: column; height: 100%; min-height: 100%; }
    .sidebar {
        position: fixed;
        top: 0;
        left: -110%;
        height: 100vh;
        width: 82%;
        max-width: 320px;
        z-index: 2000;
        border-right: 1px solid var(--border-color);
        border-bottom: none;
        background: #ffffff;
        transition: left 0.25s ease;
        padding-bottom: 40px;
    }
    .sidebar.active { left: 0; box-shadow: 0 20px 40px rgba(15, 23, 42, 0.2); }
    .chat-header { flex-wrap: wrap; gap: 10px; }
    .header-actions { flex-wrap: wrap; justify-content: flex-start; }
    .chat-container { padding: 12px; }
    .mobile-menu-btn { display: inline-flex; flex-direction: column; }
}

@media (max-width: 640px) {
    .header-actions { display: none; }
    .message { max-width: 100%; }
    .prompt-starters { display: flex; overflow-x: auto; flex-wrap: nowrap; }
    .prompt-starters .starter-btn { white-space: nowrap; flex: 0 0 auto; }
    .input-wrapper { flex-direction: row; align-items: center; padding: 10px; }
    .attach-btn, .send-btn { width: 44px; height: 44px; border-radius: 12px; }
    #chat-input { min-height: 44px; }
    .tutor-quick-actions { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; }
    .quick-btn { flex: 0 0 auto; font-size: 11px; padding: 6px 10px; }
    .settings-header { font-size: 14px; }
    .settings-toggle { padding: 6px 10px; }
    .simple-footer { padding: 8px 16px; }
    .simple-footer p { font-size: 11px; }
}

.tutor-controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 8px;
    align-items: flex-end;
}

.tutor-quick-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.quick-btn {
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: #f5f6f8;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
}

.quick-btn.active {
    background: #111827;
    color: #fff;
    border-color: #111827;
}

.tutor-status-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.status-pill {
    font-size: 12px;
    color: #111827;
    background: #eef2ff;
    border-radius: 999px;
    padding: 4px 10px;
    font-weight: 600;
}

.tutor-controls label {
    display: flex;
    flex-direction: column;
    font-size: 12px;
    color: #6f7682;
    gap: 6px;
}

.tutor-controls select {
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: #fff;
    font-family: 'Space Grotesk', 'Manrope', sans-serif;
}

.mode-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.mode-btn {
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: #fff;
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 600;
    cursor: pointer;
}

.mode-btn.active {
    background: #111827;
    color: #fff;
    border-color: #111827;
}

.guided-step {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #0f172a;
    background: #e0f2fe;
    border: 1px solid #bae6fd;
    border-radius: 999px;
    padding: 4px 10px;
    margin-bottom: 8px;
}

.explanation {
    margin-bottom: 10px;
}

.question-box {
    background: #e0f2fe;
    border: 1px solid #bae6fd;
    border-radius: 12px;
    padding: 12px 14px;
}

.answer-options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.answer-option-btn {
    border: 1px solid rgba(15, 23, 42, 0.16);
    background: #fff;
    color: #0f172a;
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.answer-option-btn[data-tone="1"] {
    background: #eaf7ef;
    border-color: #cdebd9;
}

.answer-option-btn[data-tone="2"] {
    background: #fff6e5;
    border-color: #fde2b3;
}

.answer-option-btn[data-tone="3"] {
    background: #eaf2ff;
    border-color: #c9dcff;
}

.answer-option-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
    border-color: rgba(15, 23, 42, 0.28);
}

.answer-option-btn.correct {
    background: #dcfce7;
    border-color: #86efac;
    color: #166534;
}

.answer-option-btn.wrong {
    background: #ffe4e6;
    border-color: #fda4af;
    color: #9f1239;
}

.guided-feedback {
    margin-top: 8px;
    padding: 10px 12px;
    border-radius: 10px;
    font-weight: 600;
}

.guided-feedback-success {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    color: #166534;
}

.guided-feedback-error {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    color: #9a3412;
}

.lesson-final {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 18px;
}

.final-title {
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 6px;
}

.final-reward {
    font-weight: 600;
    margin-bottom: 10px;
}

.final-summary {
    padding: 12px 14px;
    border-radius: 12px;
    background: #eef6ff;
    border: 1px solid #cfe2ff;
    margin-bottom: 12px;
}

.final-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.final-action-btn {
    border: 1px solid rgba(15, 23, 42, 0.16);
    background: #fff;
    color: #0f172a;
    padding: 8px 14px;
    border-radius: 999px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.final-action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.final-action-btn:disabled {
    opacity: 0.6;
    cursor: default;
    box-shadow: none;
    transform: none;
}

.answer-option-btn:disabled {
    opacity: 0.6;
    cursor: default;
    box-shadow: none;
    transform: none;
}

.file-preview {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 10px;
    background: #fff;
}

.file-preview img {
    width: 72px;
    height: 72px;
    object-fit: cover;
    border-radius: 8px;
}

.remove-file-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: none;
    background: #111827;
    color: #fff;
    cursor: pointer;
}

.message-image img {
    margin-top: 8px;
    max-width: 220px;
    border-radius: 10px;
}