/* ==========================================================================
   SUPERCHAT AI - Demo Page Styles
   Kerala green/gold theme. Clean chat interface. Full dark mode support.
   All values use CSS custom properties from style.css for consistency.
   ========================================================================== */

/* ============================================
   1. DEMO HERO - Compact banner
   ============================================ */
.demo-hero {
    background: linear-gradient(135deg, var(--kerala-green-dark), var(--kerala-green), var(--kerala-backwater));
    padding: var(--sp-10) var(--sp-6);
    text-align: center;
    color: #fff;
}

.demo-hero h1 {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--sp-2);
    letter-spacing: -0.02em;
}

.demo-hero p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ============================================
   2. MODEL LOADER - Progress bar during download
   ============================================ */
.demo-loader {
    position: sticky;
    top: 72px; /* below nav */
    z-index: 50;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: var(--sp-3) var(--sp-6);
    transition: opacity var(--duration) var(--ease-out),
                visibility var(--duration);
}

.demo-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    height: 0;
    padding: 0;
    border: none;
    overflow: hidden;
}

.demo-loader__inner {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

.demo-loader__top {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.demo-loader__text {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    flex: 1;
    min-width: 0;
    overflow: hidden;
}
.demo-loader__text #loaderStatus {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.demo-loader__text #loaderDetail {
    display: block;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.demo-loader__bar {
    width: 100%;
    height: 6px;
    background: var(--bg-subtle);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.demo-loader__progress {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--kerala-green), var(--kerala-green-light));
    border-radius: var(--radius-full);
    transition: width 0.4s var(--ease-out);
}

[data-theme="dark"] .demo-loader__progress {
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
}

.demo-loader__percent {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--kerala-green);
    min-width: 40px;
    text-align: right;
    flex-shrink: 0;
}

/* ============================================
   3. CHAT INTERFACE - Main container
   ============================================ */
.demo-chat {
    max-width: 900px;
    margin: 0 auto;
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    position: relative;
}

/* ============================================
   4. MODE TABS - Chat | Documents | Medical
   ============================================ */
.demo-tabs {
    position: sticky;
    top: 72px; /* below nav */
    z-index: 40;
    display: flex;
    gap: 4px;
    padding: var(--sp-3) var(--sp-6);
    background: var(--bg-elevated);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border);
}

/* When loader is visible, push tabs below it */
.demo-loader:not(.hidden) ~ .demo-chat .demo-tabs {
    top: 112px;
}

/* --- Language Selector Bar --- */
.demo-lang {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-6);
    background: var(--bg-subtle);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.demo-lang::-webkit-scrollbar { display: none; }

.demo-lang__label {
    color: var(--text-tertiary);
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.demo-lang__btn {
    padding: var(--sp-1) var(--sp-3);
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-tertiary);
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--duration);
}
.demo-lang__btn:hover {
    color: var(--text);
    background: var(--bg-elevated);
    border-color: var(--border);
}
.demo-lang__btn.active {
    color: var(--accent);
    background: var(--bg-elevated);
    border-color: var(--accent);
    font-weight: 600;
}

.demo-tab {
    padding: var(--sp-2) var(--sp-5);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
    white-space: nowrap;
}

.demo-tab:hover {
    color: var(--text);
    background: var(--bg-subtle);
}

.demo-tab.active {
    background: var(--kerala-green);
    color: #fff;
    border-color: transparent;
}

[data-theme="dark"] .demo-tab.active {
    background: var(--accent);
    color: #0A0F0A;
}

.demo-tab[data-mode="medical"].active {
    background: var(--kerala-backwater);
    color: #fff;
}

[data-theme="dark"] .demo-tab[data-mode="medical"].active {
    background: var(--kerala-backwater);
    color: #fff;
}

/* ============================================
   5. MESSAGES - Scrollable chat area
   ============================================ */
.demo-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--sp-6);
    scroll-behavior: smooth;
    display: flex;
    flex-direction: column;
}

/* ============================================
   6. WELCOME SCREEN - Before first message
   ============================================ */
.demo-welcome {
    text-align: center;
    padding-top: var(--sp-16);
    padding-bottom: var(--sp-10);
}

.demo-welcome__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--sp-6);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--kerala-green), var(--kerala-gold));
    border-radius: var(--radius-lg);
    font-size: 1.8rem;
    color: #fff;
}

[data-theme="dark"] .demo-welcome__icon {
    background: linear-gradient(135deg, var(--accent), var(--kerala-gold));
}

.demo-welcome h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--sp-2);
    letter-spacing: -0.01em;
}

.demo-welcome p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 420px;
    margin: 0 auto var(--sp-8);
    line-height: 1.6;
}

/* ============================================
   7. EXAMPLE PROMPTS - Clickable chips
   ============================================ */
.demo-prompts {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-3);
    justify-content: center;
    padding: 0 var(--sp-6);
}

.demo-prompt {
    padding: 10px 20px;
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
    white-space: nowrap;
}

.demo-prompt:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--bg-elevated);
}

/* ============================================
   8. CHAT MESSAGES - Individual bubbles
   ============================================ */
.demo-msg {
    margin-bottom: var(--sp-4);
    max-width: 80%;
    padding: var(--sp-4) var(--sp-5);
    font-size: 0.92rem;
    line-height: 1.65;
    animation: msgFadeIn 0.3s var(--ease-out);
}

@keyframes msgFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* User message */
.demo-msg--user {
    align-self: flex-end;
    background: var(--kerala-green);
    color: #fff;
    border-radius: 16px 16px 4px 16px;
}

[data-theme="dark"] .demo-msg--user {
    background: var(--accent);
    color: #0A0F0A;
}

/* AI message */
.demo-msg--ai {
    align-self: flex-start;
    background: var(--bg-subtle);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 16px 16px 16px 4px;
}

/* Message header: label + speaker button */
.demo-msg__header {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    margin-bottom: var(--sp-1);
}

.demo-msg__label {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.demo-msg__tts-controls {
    display: inline-flex; align-items: center; gap: 2px; flex-shrink: 0;
}
.demo-msg__tts-controls.speaking .demo-msg__speak { color: var(--kerala-gold); }
.demo-msg__speak {
    display: flex; align-items: center; justify-content: center;
    width: 22px; height: 22px;
    background: none; border: none; cursor: pointer;
    color: var(--text-tertiary); border-radius: 50%;
    transition: all var(--duration);
    padding: 0; flex-shrink: 0;
}
.demo-msg__speak:hover { color: var(--accent); background: var(--bg-subtle); }
.demo-msg__stop-btn:hover { color: var(--error, #e53935); background: var(--bg-subtle); }
.demo-msg__speak svg { width: 14px; height: 14px; }

/* Markdown-rendered content inside AI messages */
.demo-msg--ai p {
    margin-bottom: var(--sp-2);
}

.demo-msg--ai p:last-child {
    margin-bottom: 0;
}

.demo-msg--ai code {
    font-size: 0.85em;
    background: var(--border);
    padding: 2px 6px;
    border-radius: 4px;
}

.demo-msg--ai pre {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--sp-3) var(--sp-4);
    overflow-x: auto;
    margin: var(--sp-3) 0;
    font-size: 0.82rem;
    line-height: 1.5;
}

.demo-msg--ai ul,
.demo-msg--ai ol {
    padding-left: var(--sp-5);
    margin: var(--sp-2) 0;
}

.demo-msg--ai li {
    margin-bottom: var(--sp-1);
}

/* ============================================
   9. TYPING INDICATOR - Bouncing dots
   ============================================ */
.demo-typing {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: var(--sp-4) var(--sp-5);
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: 16px 16px 16px 4px;
    margin-bottom: var(--sp-4);
}

.demo-typing__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--kerala-green);
    animation: typingBounce 1.4s ease-in-out infinite;
}

[data-theme="dark"] .demo-typing__dot {
    background: var(--accent);
}

.demo-typing__dot:nth-child(2) {
    animation-delay: 0.16s;
}

.demo-typing__dot:nth-child(3) {
    animation-delay: 0.32s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* ============================================
   10. UPLOAD ZONE - File drop area
   ============================================ */
.demo-upload {
    padding: var(--sp-6);
}

.demo-upload__zone {
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius-lg);
    padding: var(--sp-10);
    text-align: center;
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
}

.demo-upload__zone:hover,
.demo-upload__zone.dragover {
    border-color: var(--accent);
    background: rgba(27, 94, 32, 0.03);
}

[data-theme="dark"] .demo-upload__zone:hover,
[data-theme="dark"] .demo-upload__zone.dragover {
    background: rgba(102, 187, 106, 0.05);
}

.demo-upload__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--sp-4);
    color: var(--text-tertiary);
}

.demo-upload__icon svg {
    width: 100%;
    height: 100%;
}

.demo-upload__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--sp-1);
}

.demo-upload__desc {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

/* Upload / OCR progress */
.demo-upload__progress {
    margin-top: var(--sp-4);
    display: none;
}

.demo-upload__progress.active {
    display: block;
}

.demo-upload__progress-bar {
    height: 4px;
    background: var(--bg-subtle);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--sp-2);
}

.demo-upload__progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--kerala-green), var(--kerala-green-light));
    border-radius: var(--radius-full);
    transition: width 0.3s var(--ease-out);
}

[data-theme="dark"] .demo-upload__progress-fill {
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
}

.demo-upload__progress-text {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    text-align: center;
}

/* ============================================
   11. RATE LIMIT BANNER
   ============================================ */
.demo-limit {
    background: var(--kerala-gold);
    color: #1A1A1A;
    padding: var(--sp-4) var(--sp-6);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: var(--sp-4) var(--sp-6);
    gap: var(--sp-4);
}

.demo-limit__text {
    font-size: 0.88rem;
    font-weight: 500;
    line-height: 1.4;
}

.demo-limit__action {
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 700;
    padding: var(--sp-2) var(--sp-4);
    background: rgba(0, 0, 0, 0.15);
    color: #1A1A1A;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--duration);
}

.demo-limit__action:hover {
    background: rgba(0, 0, 0, 0.25);
}

/* ============================================
   12. INPUT BAR - Sticky bottom
   ============================================ */
.demo-input {
    position: sticky;
    bottom: 0;
    z-index: 30;
    background: var(--bg-elevated);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-top: 1px solid var(--border);
    padding: var(--sp-4) var(--sp-6);
}

.demo-input__bar {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--sp-2) var(--sp-3);
    transition: border-color var(--duration);
}

.demo-input__bar:focus-within {
    border-color: var(--accent);
}

.demo-input__text {
    flex: 1;
    background: transparent;
    border: none;
    resize: none;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.5;
    padding: var(--sp-2) var(--sp-1);
    min-height: 24px;
    max-height: 140px;
    overflow-y: auto;
    outline: none;
}

.demo-input__text::placeholder {
    color: var(--text-tertiary);
}

.demo-input__btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: 50%;
    color: var(--text-tertiary);
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--duration) var(--ease-out);
}

.demo-input__btn:hover {
    color: var(--accent);
    background: var(--bg-subtle);
}

.demo-input__btn svg {
    width: 18px;
    height: 18px;
}

.demo-input__send {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--kerala-green);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--duration) var(--ease-out);
}

.demo-input__send:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.demo-input__send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

[data-theme="dark"] .demo-input__send {
    background: var(--accent);
    color: #0A0F0A;
}

.demo-input__send svg {
    width: 18px;
    height: 18px;
}

.demo-input__info {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--sp-2);
    padding: 0 var(--sp-1);
}

/* ============================================
   13. VOICE RECORDING OVERLAY
   ============================================ */
.demo-voice-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration), visibility var(--duration);
}

.demo-voice-overlay.active {
    opacity: 1;
    visibility: visible;
}

.demo-voice-overlay__inner {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: var(--sp-10);
    text-align: center;
    min-width: 280px;
    box-shadow: var(--shadow-xl);
}

.demo-voice-overlay__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--sp-6);
}

.demo-voice-overlay__waves {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 64px;
    margin-bottom: var(--sp-6);
}

.demo-voice-overlay__bar {
    width: 6px;
    border-radius: var(--radius-full);
    animation: voiceWave 1.2s ease-in-out infinite;
}

.demo-voice-overlay__bar:nth-child(1) {
    height: 20px;
    background: var(--kerala-green);
    animation-delay: 0s;
}

.demo-voice-overlay__bar:nth-child(2) {
    height: 36px;
    background: var(--kerala-green-light);
    animation-delay: 0.15s;
}

.demo-voice-overlay__bar:nth-child(3) {
    height: 48px;
    background: var(--kerala-gold);
    animation-delay: 0.3s;
}

.demo-voice-overlay__bar:nth-child(4) {
    height: 32px;
    background: var(--kerala-green-light);
    animation-delay: 0.45s;
}

.demo-voice-overlay__bar:nth-child(5) {
    height: 24px;
    background: var(--kerala-green);
    animation-delay: 0.6s;
}

[data-theme="dark"] .demo-voice-overlay__bar:nth-child(1),
[data-theme="dark"] .demo-voice-overlay__bar:nth-child(5) {
    background: var(--accent);
}

[data-theme="dark"] .demo-voice-overlay__bar:nth-child(2),
[data-theme="dark"] .demo-voice-overlay__bar:nth-child(4) {
    background: var(--accent-light);
}

@keyframes voiceWave {
    0%, 100% {
        transform: scaleY(0.4);
    }
    50% {
        transform: scaleY(1);
    }
}

.demo-voice-overlay__timer {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--sp-6);
    font-variant-numeric: tabular-nums;
}

.demo-voice-overlay__stop {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    background: var(--kerala-mural-red);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
}

.demo-voice-overlay__stop:hover {
    transform: scale(1.08);
    background: #D32F2F;
}

.demo-voice-overlay__stop svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   14. MEDICAL MODE ACCENT
   ============================================ */
.demo-chat[data-mode="medical"] .demo-input__send {
    background: var(--kerala-backwater);
}

[data-theme="dark"] .demo-chat[data-mode="medical"] .demo-input__send {
    background: var(--kerala-backwater);
    color: #fff;
}

.demo-chat[data-mode="medical"] .demo-msg--user {
    background: var(--kerala-backwater);
}

[data-theme="dark"] .demo-chat[data-mode="medical"] .demo-msg--user {
    background: var(--kerala-backwater);
    color: #fff;
}

.demo-chat[data-mode="medical"] .demo-typing__dot {
    background: var(--kerala-backwater);
}

.demo-chat[data-mode="medical"] .demo-welcome__icon {
    background: linear-gradient(135deg, var(--kerala-backwater), var(--kerala-gold));
}

/* ============================================
   15. TUTOR MODE ACCENT
   ============================================ */
.demo-tab[data-mode="tutor"].active {
    background: var(--hyd-purple, #6A1B9A);
    color: #fff;
}

[data-theme="dark"] .demo-tab[data-mode="tutor"].active {
    background: var(--hyd-purple, #6A1B9A);
    color: #fff;
}

.demo-chat[data-mode="tutor"] .demo-input__send {
    background: var(--hyd-purple, #6A1B9A);
}

[data-theme="dark"] .demo-chat[data-mode="tutor"] .demo-input__send {
    background: var(--hyd-purple, #6A1B9A);
    color: #fff;
}

.demo-chat[data-mode="tutor"] .demo-msg--user {
    background: var(--hyd-purple, #6A1B9A);
}

[data-theme="dark"] .demo-chat[data-mode="tutor"] .demo-msg--user {
    background: var(--hyd-purple, #6A1B9A);
    color: #fff;
}

.demo-chat[data-mode="tutor"] .demo-typing__dot {
    background: var(--hyd-purple, #6A1B9A);
}

.demo-chat[data-mode="tutor"] .demo-welcome__icon {
    background: linear-gradient(135deg, var(--hyd-purple, #6A1B9A), var(--kerala-gold));
}

/* Tutor welcome */
.demo-tutor-welcome {
    text-align: center;
    padding-top: var(--sp-16);
    padding-bottom: var(--sp-10);
}

.demo-tutor-welcome .demo-welcome__icon {
    background: linear-gradient(135deg, var(--hyd-purple, #6A1B9A), var(--kerala-gold));
}

.demo-tutor-welcome h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--sp-2);
    letter-spacing: -0.01em;
}

.demo-tutor-welcome p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 420px;
    margin: 0 auto var(--sp-8);
    line-height: 1.6;
}

/* Tutor topic chips */
.demo-tutor-topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-3);
    justify-content: center;
    margin-top: var(--sp-6);
}

/* Tutor progress bar */
.demo-tutor-progress {
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    padding: var(--sp-2) var(--sp-6);
    background: rgba(106, 27, 154, 0.06);
    border-bottom: 1px solid rgba(106, 27, 154, 0.12);
    font-size: 0.82rem;
}

.demo-tutor-progress__topic {
    font-weight: 700;
    color: var(--hyd-purple, #6A1B9A);
}

.demo-tutor-progress__status {
    color: var(--text-secondary);
}

.demo-tutor-progress__change {
    margin-left: auto;
    background: none;
    border: 1px solid var(--border);
    padding: var(--sp-1) var(--sp-3);
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    transition: all var(--duration);
}

.demo-tutor-progress__change:hover {
    border-color: var(--hyd-purple, #6A1B9A);
    color: var(--hyd-purple, #6A1B9A);
}

/* ============================================
   16. RESPONSIVE - 768px breakpoint
   ============================================ */
@media (max-width: 768px) {
    .demo-hero {
        padding: var(--sp-8) var(--sp-4);
    }

    .demo-hero h1 {
        font-size: 1.4rem;
    }

    .demo-hero p {
        font-size: 0.88rem;
    }

    .demo-chat {
        min-height: 50vh;
    }

    .demo-tabs {
        padding: var(--sp-2) var(--sp-4);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .demo-tab {
        padding: var(--sp-2) var(--sp-4);
        font-size: 0.8rem;
    }

    .demo-messages {
        padding: var(--sp-4);
    }

    .demo-msg {
        max-width: 90%;
    }

    .demo-welcome {
        padding-top: var(--sp-10);
    }

    .demo-welcome__icon {
        width: 52px;
        height: 52px;
        font-size: 1.4rem;
    }

    .demo-welcome h2 {
        font-size: 1.25rem;
    }

    .demo-prompts {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: 0 var(--sp-4);
        scrollbar-width: none;
    }

    .demo-prompts::-webkit-scrollbar {
        display: none;
    }

    .demo-prompt {
        padding: var(--sp-2) var(--sp-4);
        font-size: 0.8rem;
        flex-shrink: 0;
    }

    .demo-input {
        padding: var(--sp-3) var(--sp-4);
    }

    .demo-upload__zone {
        padding: var(--sp-8);
    }

    .demo-upload {
        padding: var(--sp-4);
    }

    .demo-limit {
        flex-direction: column;
        text-align: center;
        margin: var(--sp-3) var(--sp-4);
    }

    .demo-voice-overlay__inner {
        margin: var(--sp-6);
        padding: var(--sp-8);
    }
}

/* Small screens */
@media (max-width: 480px) {
    .demo-hero h1 {
        font-size: 1.2rem;
    }

    .demo-msg {
        max-width: 95%;
        padding: var(--sp-3) var(--sp-4);
        font-size: 0.88rem;
    }

    .demo-input__bar {
        padding: var(--sp-1) var(--sp-2);
    }

    .demo-input__text {
        font-size: 0.9rem;
    }
}

/* ============================================
   17. WORKFLOW BUILDER
   ============================================ */
/* Orange accent for workflow mode */
.demo-tab[data-mode="workflow"].active { background: #F59E0B; color: #1A1A1A; }
[data-theme="dark"] .demo-tab[data-mode="workflow"].active { background: #F59E0B; color: #1A1A1A; }

.demo-workflow { display: flex; flex-direction: column; flex: 1; min-height: 0; }

/* Toolbar */
.wf-toolbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: var(--sp-3) var(--sp-4);
    background: var(--bg-elevated); border-bottom: 1px solid var(--border);
    gap: var(--sp-3); flex-wrap: nowrap;
}
.wf-toolbar__nodes {
    display: flex; align-items: center; gap: var(--sp-2);
    overflow-x: auto; flex: 1; min-width: 0;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}
.wf-toolbar__nodes::-webkit-scrollbar { display: none; }
.wf-toolbar__label { font-size: 0.75rem; color: var(--text-tertiary); white-space: nowrap; font-weight: 600; }
.wf-toolbar__actions { display: flex; gap: var(--sp-2); flex-shrink: 0; }

.wf-palette-node {
    padding: var(--sp-1) var(--sp-3);
    background: var(--bg-subtle); border: 1px solid var(--border);
    border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 500;
    cursor: grab; white-space: nowrap;
    transition: all var(--duration);
    user-select: none;
}
.wf-palette-node:hover { border-color: var(--accent); background: var(--bg-elevated); }
.wf-palette-node:active { cursor: grabbing; }

/* Canvas */
.wf-canvas {
    position: relative; flex: 1; min-height: 65vh; overflow: auto;
    background: var(--bg);
    background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
    background-size: 20px 20px;
}
.wf-connections {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 1;
}
.wf-connections path { transition: stroke 0.3s, stroke-width 0.3s; }

/* Empty state */
.wf-empty {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    text-align: center; color: var(--text-tertiary);
}
.wf-empty svg { margin: 0 auto var(--sp-4); opacity: 0.3; }
.wf-empty p { font-size: 0.9rem; margin-bottom: var(--sp-4); }

/* Nodes */
.wf-node {
    position: absolute; width: 200px; z-index: 2;
    background: var(--card-bg); border: 2px solid #6366f1;
    border-radius: var(--radius-md); box-shadow: var(--shadow-md);
    cursor: grab; user-select: none;
    transition: box-shadow 0.2s;
}
.wf-node:hover { box-shadow: var(--shadow-lg); }

.wf-node__header {
    display: flex; justify-content: space-between; align-items: center;
    padding: var(--sp-2) var(--sp-3);
    border-bottom: 1px solid var(--border);
    font-size: 0.82rem; font-weight: 600;
}
.wf-node__delete {
    background: none; border: none; color: var(--text-tertiary);
    cursor: pointer; font-size: 1.1rem; line-height: 1; padding: 0 4px;
}
.wf-node__delete:hover { color: var(--kerala-mural-red); }

.wf-node__body { padding: var(--sp-2) var(--sp-3); }
.wf-node__field { font-size: 0.72rem; color: var(--text-secondary); margin-bottom: 2px; }
.wf-node__key { font-weight: 600; color: var(--text-tertiary); }
.wf-node__val { color: var(--text); }

.wf-node__output {
    padding: var(--sp-2) var(--sp-3); margin: 0 var(--sp-2) var(--sp-2);
    background: var(--bg-subtle); border-radius: var(--radius-sm);
    font-size: 0.7rem; color: var(--accent); max-height: 60px; overflow: auto;
    font-family: monospace;
}

/* Display node area */
.wf-node__display-area {
    padding: var(--sp-3);
    margin: 0 var(--sp-2) var(--sp-2);
    background: var(--bg);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    min-height: 40px;
    min-width: 140px;
    font-family: monospace;
    font-size: 0.75rem;
}
.wf-executed .wf-node__display-area {
    border-color: #10B981;
    border-style: solid;
    background: rgba(16, 185, 129, 0.05);
}

/* Node Inspector Panel */
.wf-inspector {
    position: absolute;
    z-index: 200;
    width: 320px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: wfInspFadeIn 0.2s ease-out;
}
@keyframes wfInspFadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.wf-inspector__header {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-4);
    background: var(--bg-subtle);
    border-bottom: 1px solid var(--border);
}
.wf-inspector__title {
    font-weight: 700;
    font-size: 0.85rem;
}
.wf-inspector__id {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    font-family: monospace;
    flex: 1;
}
.wf-inspector__close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-tertiary);
    padding: 0;
    line-height: 1;
}
.wf-inspector__close:hover { color: var(--text-primary); }
.wf-inspector__section {
    padding: var(--sp-3) var(--sp-4);
    border-bottom: 1px solid var(--border);
}
.wf-inspector__section:last-child { border-bottom: none; }
.wf-inspector__label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: var(--sp-2);
}
.wf-inspector__data {
    margin: 0;
    padding: var(--sp-2) var(--sp-3);
    background: var(--bg-subtle);
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 150px;
    overflow-y: auto;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Ports */
.wf-port {
    width: 12px; height: 12px; border-radius: 50%;
    background: #6366f1; position: absolute;
    cursor: pointer; z-index: 3;
    border: 2px solid var(--card-bg);
    box-shadow: 0 0 4px rgba(99,102,241,0.5);
    transition: transform 0.2s, box-shadow 0.2s;
}
.wf-port:hover { transform: scale(1.4); box-shadow: 0 0 8px rgba(99,102,241,0.8); }
.wf-port--in { top: -6px; left: 50%; transform: translateX(-50%); }
.wf-port--in:hover { transform: translateX(-50%) scale(1.4); }
.wf-port--out { bottom: -6px; left: 50%; transform: translateX(-50%); }
.wf-port--out:hover { transform: translateX(-50%) scale(1.4); }
.wf-port--true { left: 35%; background: #30D158; }
.wf-port--false { left: 65%; background: #F97316; }
.wf-port--active { animation: portPulse 0.8s ease infinite; }
@keyframes portPulse { 0%,100% { box-shadow: 0 0 4px rgba(99,102,241,0.5); } 50% { box-shadow: 0 0 12px rgba(99,102,241,0.9); } }

/* Execution states */
.wf-node.wf-executing { border-color: #F59E0B; background: #FFFBEB; animation: wfPulse 1s infinite; }
.wf-node.wf-executed { border-color: #30D158; background: #F0FDF4; }
.wf-node.wf-error { border-color: #EF4444; background: #FEF2F2; }
[data-theme="dark"] .wf-node.wf-executing { background: rgba(245,158,11,0.1); }
[data-theme="dark"] .wf-node.wf-executed { background: rgba(48,209,88,0.1); }
[data-theme="dark"] .wf-node.wf-error { background: rgba(239,68,68,0.1); }
@keyframes wfPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.7; } }

/* Execution log */
.wf-log {
    background: var(--bg-elevated); border-top: 1px solid var(--border);
    max-height: 200px; overflow: hidden; display: flex; flex-direction: column;
}
.wf-log__header {
    display: flex; justify-content: space-between; align-items: center;
    padding: var(--sp-2) var(--sp-4);
    font-size: 0.82rem; font-weight: 600; border-bottom: 1px solid var(--border);
}
.wf-log__close { background: none; border: none; cursor: pointer; font-size: 1.2rem; color: var(--text-tertiary); }
.wf-log__content { flex: 1; overflow-y: auto; padding: var(--sp-2) var(--sp-4); }
.wf-log__entry { font-size: 0.78rem; padding: 2px 0; color: var(--text-secondary); font-family: monospace; }

/* Hide chat input bar in workflow mode */
.demo-chat[data-mode="workflow"] .demo-input { display: none; }

/* Workflow mode: use full width */
.demo-chat[data-mode="workflow"] {
    max-width: 100%;
    padding: 0 var(--sp-2);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.demo-hidden {
    display: none !important;
}

.demo-fade-in {
    animation: demoFadeIn 0.4s var(--ease-out);
}

@keyframes demoFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}