/**
 * AI Companion — mobile-first panel
 * Base = mobile; enhance with min-width for tablet/desktop
 * Load after css/styles.css on ai-companion.html only
 */

/* ----- Utilities ----- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ----- Hero (unchanged) ----- */
.ai-companion-hero .ai-hero-trust {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.35rem 0.5rem;
}
.ai-companion-hero .ai-hero-trust-item { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; }
.ai-companion-hero .ai-hero-trust-dot { color: var(--text-light); font-weight: 400; }
.ai-companion-hero .ai-hero-sample-cta { margin: clamp(1.25rem, 3vw, 1.75rem) 0 0; text-align: center; }
.ai-companion-hero .ai-hero-sample-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill, 999px);
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.ai-companion-hero .ai-hero-sample-link:hover {
    background: var(--bg-white);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* ----- Main section: mobile-first ----- */
.page-ai-companion:not(.dark-mode) .ai-companion-main {
    background: var(--bg-light);
    padding: 0.75rem 0 clamp(1rem, 4vw, 2rem);
}
.page-ai-companion .ai-companion-main .container {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
}

/* Layout: single column on small screens (sidebar drawer) */
@media (max-width: 768px) {
    .page-ai-companion .ai-companion-main .container { padding-left: 0.6rem; padding-right: 0.6rem; }
}
@media (min-width: 769px) {
    .page-ai-companion:not(.dark-mode) .ai-companion-main { padding: clamp(2.5rem, 6vw, 4rem) 0; }
}

/* ----- Unified panel design: side panel + AI panel use same look ----- */
.page-ai-companion .ai-layout {
    --ai-panel-radius: var(--radius-md, 10px);
    --ai-panel-border: 1px solid var(--border-color);
    --ai-panel-bg: var(--bg-white);
    --ai-header-bg: var(--bg-light);
    --ai-title-size: 0.95rem;
    --ai-label-size: 0.875rem;
    --ai-body-size: 0.875rem;
    --ai-pill-size: 0.8125rem;
    --ai-font-weight-title: 700;
    --ai-font-weight-label: 600;
    --ai-font-weight-body: 500;
    --ai-text: var(--text-primary);
    --ai-text-muted: var(--text-secondary);
}
.page-ai-companion .ai-sidebar,
.page-ai-companion .ai-chat-area {
    font-family: inherit;
    color: var(--text-primary);
    background: var(--ai-panel-bg) !important;
    border: var(--ai-panel-border);
    border-radius: var(--ai-panel-radius);
    box-shadow: var(--shadow-sm);
}
.page-ai-companion .ai-sidebar .sidebar-header,
.page-ai-companion .ai-chat-area .chat-header {
    background: var(--ai-header-bg) !important;
    border-bottom: var(--ai-panel-border);
    color: var(--ai-text);
}
.page-ai-companion .ai-sidebar .sidebar-title,
.page-ai-companion .ai-chat-area .welcome-title {
    font-size: var(--ai-title-size);
    font-weight: var(--ai-font-weight-title);
    color: var(--ai-text) !important;
}
.page-ai-companion .ai-sidebar .form-label,
.page-ai-companion .ai-chat-area .welcome-instruction {
    font-size: var(--ai-label-size);
    font-weight: var(--ai-font-weight-label);
    color: var(--ai-text) !important;
}
.page-ai-companion .ai-sidebar .sidebar-section-header .sidebar-title {
    font-size: var(--ai-label-size);
    font-weight: var(--ai-font-weight-title);
    color: var(--ai-text) !important;
}
.page-ai-companion .ai-sidebar .form-select,
.page-ai-companion .ai-sidebar .form-input,
.page-ai-companion .ai-sidebar .mode-btn,
.page-ai-companion .ai-sidebar .quick-action-btn,
.page-ai-companion .ai-chat-area .chat-pill,
.page-ai-companion .ai-chat-area .output-mode-btn,
.page-ai-companion .ai-chat-area .fullscreen-toggle {
    font-size: var(--ai-body-size);
    color: var(--ai-text);
}
.page-ai-companion .ai-sidebar .form-hint,
.page-ai-companion .ai-chat-area .welcome-lead,
.page-ai-companion .ai-chat-area .welcome-features,
.page-ai-companion .ai-chat-area .welcome-tip {
    font-size: var(--ai-body-size);
    color: var(--ai-text-muted) !important;
}
.page-ai-companion .ai-sidebar .mode-btn .mode-text,
.page-ai-companion .ai-sidebar .quick-action-btn,
.page-ai-companion .ai-chat-area .chat-pill {
    font-weight: var(--ai-font-weight-body);
}
.page-ai-companion .ai-chat-area .chat-pill,
.page-ai-companion .ai-chat-area .output-mode-btn:not(.active),
.page-ai-companion .ai-chat-area .fullscreen-toggle {
    color: var(--ai-text-muted) !important;
}
.page-ai-companion .ai-sidebar .form-select,
.page-ai-companion .ai-sidebar .form-input,
.page-ai-companion .ai-sidebar .mode-btn,
.page-ai-companion .ai-sidebar .quick-action-btn,
.page-ai-companion .ai-sidebar .sidebar-toggle,
.page-ai-companion .ai-sidebar .chat-controls .btn,
.page-ai-companion .ai-chat-area .chat-pill,
.page-ai-companion .ai-chat-area .output-mode-btn,
.page-ai-companion .ai-chat-area .fullscreen-toggle {
    border-radius: var(--radius-sm, 8px);
}
.page-ai-companion .ai-sidebar .form-select:focus,
.page-ai-companion .ai-sidebar .form-input:focus {
    border-color: var(--accent-color);
    outline: none;
    box-shadow: var(--shadow-focus);
}
.page-ai-companion .ai-chat-area .chat-input-bar:focus-within {
    border-color: var(--accent-color);
    outline: none;
}
.page-ai-companion .ai-chat-area .welcome-lead,
.page-ai-companion .ai-chat-area .welcome-features {
    font-size: var(--ai-body-size);
}
.page-ai-companion .ai-chat-area .chat-status .status-text {
    font-size: var(--ai-pill-size);
    color: var(--ai-text-muted);
}
.page-ai-companion .ai-chat-area .welcome-title {
    font-size: 1.05rem;
    font-weight: var(--ai-font-weight-title);
}

/* ----- Sidebar (desktop): alignment + typography ----- */
.page-ai-companion:not(.dark-mode) .ai-sidebar {
    padding: 0 !important;
}
/* Single padding for perfect alignment: header and content use same horizontal padding */
.page-ai-companion .ai-sidebar .sidebar-header {
    padding: 0.875rem 1rem !important;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 52px;
    box-sizing: border-box;
}
.page-ai-companion .ai-sidebar .sidebar-content {
    padding: 1rem !important;
    box-sizing: border-box;
}
.page-ai-companion .ai-sidebar .sidebar-title {
    font-size: var(--ai-title-size) !important;
    font-weight: var(--ai-font-weight-title) !important;
    margin: 0 !important;
    padding: 0 !important;
    line-height: 1.35;
}
.page-ai-companion .ai-sidebar .form-group {
    margin-bottom: 1rem;
    width: 100%;
    box-sizing: border-box;
}
.page-ai-companion .ai-sidebar .form-label {
    display: block !important;
    font-weight: var(--ai-font-weight-label) !important;
    font-size: var(--ai-label-size) !important;
    margin-bottom: 0.4rem !important;
    line-height: 1.35;
}
.page-ai-companion .ai-sidebar .form-select,
.page-ai-companion .ai-sidebar .form-input,
.page-ai-companion .ai-sidebar .api-key-input {
    width: 100% !important;
    box-sizing: border-box !important;
    border: var(--ai-panel-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    font-size: var(--ai-body-size);
    background: var(--ai-panel-bg);
}
.page-ai-companion .ai-sidebar .form-select:focus,
.page-ai-companion .ai-sidebar .form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: var(--shadow-focus);
}
.page-ai-companion .ai-sidebar .form-select option,
.page-ai-companion .ai-sidebar .form-select optgroup {
    color: var(--text-primary);
}
.page-ai-companion .ai-sidebar .form-hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    display: block;
}
.page-ai-companion .ai-sidebar .mode-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    width: 100%;
}
.page-ai-companion .ai-sidebar .mode-btn,
.page-ai-companion .ai-sidebar .access-choice-btn {
    width: 100% !important;
    box-sizing: border-box !important;
    border: var(--ai-panel-border);
    border-radius: var(--radius-sm);
    background: var(--ai-panel-bg);
    font-weight: var(--ai-font-weight-body);
    font-size: var(--ai-body-size);
    padding: 0.55rem 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-align: left;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.page-ai-companion .ai-sidebar .mode-btn:hover,
.page-ai-companion .ai-sidebar .access-choice-btn:hover {
    background: var(--bg-light);
    border-color: var(--accent-color);
    color: var(--accent-color) !important;
}
.page-ai-companion .ai-sidebar .mode-btn.active,
.page-ai-companion .ai-sidebar .access-choice-btn.active {
    background: var(--accent-soft) !important;
    border-color: var(--accent-color) !important;
    color: var(--accent-color) !important;
    box-shadow: none !important;
}
.page-ai-companion .ai-sidebar .mode-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}
.page-ai-companion .ai-sidebar .mode-text {
    flex: 1;
    min-width: 0;
}
/* Sections: same horizontal padding as content so titles align */
.page-ai-companion .ai-sidebar .sidebar-section {
    border-bottom: 1px solid var(--border-color);
    margin-left: -1rem;
    margin-right: -1rem;
    padding-left: 1rem;
    padding-right: 1rem;
    padding-bottom: 0.5rem;
}
.page-ai-companion .ai-sidebar .sidebar-section:last-child {
    border-bottom: none;
}
.page-ai-companion .ai-sidebar .sidebar-section-header {
    padding: 0.6rem 0 !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 44px;
}
.page-ai-companion .ai-sidebar .sidebar-section-header .sidebar-title {
    font-size: var(--ai-label-size) !important;
    font-weight: var(--ai-font-weight-title) !important;
}
.page-ai-companion .ai-sidebar .sidebar-section-body {
    padding: 0 0 0.25rem !important;
}
.page-ai-companion .ai-sidebar .quick-action-btn {
    border: var(--ai-panel-border);
    border-radius: var(--radius-sm);
    background: var(--ai-panel-bg);
    padding: 0.5rem 0.75rem;
    font-size: var(--ai-body-size);
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.page-ai-companion .ai-sidebar .quick-action-btn:hover {
    background: var(--bg-light);
    border-color: var(--accent-color);
    color: var(--accent-color) !important;
}
.page-ai-companion .ai-sidebar .try-free-banner {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
}
.page-ai-companion .ai-sidebar .sidebar-toggle {
    flex-shrink: 0;
    min-width: 36px;
    min-height: 36px;
    padding: 0.35rem;
    border: var(--ai-panel-border);
    border-radius: var(--radius-sm);
    background: var(--ai-panel-bg);
    color: var(--ai-text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.page-ai-companion .ai-sidebar .chat-controls .btn,
.page-ai-companion .ai-sidebar .appearance-controls .btn {
    font-size: var(--ai-body-size);
    border: var(--ai-panel-border);
    border-radius: var(--radius-sm);
    background: var(--ai-panel-bg);
}
.page-ai-companion .ai-sidebar .chat-controls .btn:hover,
.page-ai-companion .ai-sidebar .appearance-controls .btn:hover {
    color: var(--accent-color) !important;
    border-color: var(--accent-color);
}
.page-ai-companion .ai-sidebar .font-size-control .form-label {
    margin-bottom: 0.25rem;
}
.page-ai-companion .ai-sidebar #font-size-value {
    font-size: var(--ai-body-size);
    color: var(--ai-text-muted);
}

/* ----- Sidebar: mobile drawer redesign (body scoped so it wins) ----- */
@media (max-width: 768px) {
    body.page-ai-companion .ai-sidebar {
        width: 88% !important;
        max-width: 320px !important;
        min-height: 100vh !important;
        min-height: 100dvh !important;
        height: 100vh !important;
        height: 100dvh !important;
        border-radius: 0 !important;
        border: none !important;
        border-left: 1px solid var(--border-color) !important;
        box-shadow: -8px 0 32px rgba(0, 0, 0, 0.12) !important;
        padding: 0 !important;
        display: flex !important;
        flex-direction: column !important;
        z-index: 1001;
        background: var(--bg-white) !important;
        backdrop-filter: none !important;
    }
    body.page-ai-companion .ai-sidebar .sidebar-header {
        flex-shrink: 0 !important;
        padding: 1rem 1rem !important;
        border-bottom: 1px solid var(--border-color) !important;
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        gap: 0.5rem !important;
        background: var(--bg-light) !important;
        min-height: 56px !important;
    }
    body.page-ai-companion .ai-sidebar .sidebar-title {
        font-size: 1.05rem !important;
        font-weight: 700 !important;
        margin: 0 !important;
    }
    body.page-ai-companion .ai-sidebar .sidebar-toggle {
        min-width: 44px !important;
        min-height: 44px !important;
        padding: 0.5rem !important;
        border-radius: 50% !important;
        border: 1px solid var(--border-color) !important;
        background: var(--bg-white) !important;
        cursor: pointer !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        -webkit-tap-highlight-color: transparent;
    }
    body.page-ai-companion .ai-sidebar .sidebar-content {
        flex: 1 !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        padding: 1rem !important;
        max-height: none !important;
        -webkit-overflow-scrolling: touch;
        background: var(--bg-white) !important;
    }
    body.page-ai-companion .ai-sidebar .form-group {
        margin-bottom: 1.25rem !important;
    }
    body.page-ai-companion .ai-sidebar .form-label {
        font-size: 0.9rem !important;
        margin-bottom: 0.35rem !important;
    }
    body.page-ai-companion .ai-sidebar .form-select,
    body.page-ai-companion .ai-sidebar .form-input {
        min-height: 48px !important;
        padding: 0.65rem 0.85rem !important;
        font-size: 1rem !important;
        width: 100% !important;
        box-sizing: border-box !important;
        border-radius: 10px !important;
    }
    body.page-ai-companion .ai-sidebar .mode-buttons {
        display: flex !important;
        flex-direction: column !important;
        gap: 0.5rem !important;
    }
    body.page-ai-companion .ai-sidebar .mode-btn {
        min-height: 50px !important;
        padding: 0.7rem 0.85rem !important;
        display: flex !important;
        align-items: center !important;
        gap: 0.6rem !important;
        justify-content: flex-start !important;
        text-align: left !important;
        width: 100% !important;
        box-sizing: border-box !important;
        border-radius: 10px !important;
    }
    body.page-ai-companion .ai-sidebar .mode-icon {
        font-size: 1.25rem !important;
        flex-shrink: 0 !important;
    }
    body.page-ai-companion .ai-sidebar .sidebar-section {
        border: none !important;
        border-bottom: none !important;
        margin-bottom: 0.75rem !important;
        padding: 0.85rem !important;
        background: var(--bg-light) !important;
        border-radius: 12px !important;
    }
    body.page-ai-companion .ai-sidebar .sidebar-section-header {
        min-height: 48px !important;
        padding: 0 !important;
        margin: -0.25rem 0 0 !important;
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        cursor: pointer !important;
        -webkit-tap-highlight-color: transparent;
        user-select: none;
    }
    body.page-ai-companion .ai-sidebar .sidebar-section-header .sidebar-title {
        font-size: 0.95rem !important;
        margin: 0 !important;
    }
    body.page-ai-companion .ai-sidebar .section-toggle-btn {
        min-width: 40px !important;
        min-height: 40px !important;
        padding: 0 !important;
        border: none !important;
        background: transparent !important;
        border-radius: 50% !important;
        font-size: 1.25rem !important;
        line-height: 1 !important;
        color: var(--text-secondary) !important;
        cursor: pointer !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        transition: transform 0.2s ease;
    }
    body.page-ai-companion .ai-sidebar .collapsible-section.collapsed .section-toggle-btn {
        transform: rotate(-90deg);
    }
    body.page-ai-companion .ai-sidebar .sidebar-section-body {
        padding: 0.75rem 0 0 !important;
    }
    body.page-ai-companion .ai-sidebar .quick-actions {
        display: flex !important;
        flex-wrap: wrap !important;
        gap: 0.5rem !important;
    }
    body.page-ai-companion .ai-sidebar .quick-action-btn {
        min-height: 46px !important;
        padding: 0.6rem 0.75rem !important;
        font-size: 0.9rem !important;
        flex: 1 1 calc(50% - 0.25rem) !important;
        min-width: 0 !important;
        box-sizing: border-box !important;
        border-radius: 10px !important;
    }
    body.page-ai-companion .ai-sidebar .chat-controls {
        display: flex !important;
        flex-wrap: wrap !important;
        gap: 0.5rem !important;
    }
    body.page-ai-companion .ai-sidebar .chat-controls .btn {
        min-height: 46px !important;
        padding: 0.6rem 0.75rem !important;
        font-size: 0.85rem !important;
        flex: 1 1 calc(50% - 0.25rem) !important;
        min-width: 0 !important;
        box-sizing: border-box !important;
        border-radius: 10px !important;
    }
    body.page-ai-companion .ai-sidebar .appearance-controls .btn {
        min-height: 46px !important;
        width: 100% !important;
        border-radius: 10px !important;
    }
    body.page-ai-companion .sidebar-overlay {
        background: rgba(0, 0, 0, 0.45) !important;
        backdrop-filter: blur(4px);
    }
    body.page-ai-companion .mobile-sidebar-toggle {
        bottom: max(1rem, env(safe-area-inset-bottom)) !important;
        right: 1rem !important;
        width: 54px !important;
        height: 54px !important;
        border-radius: 50% !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        font-size: 1.5rem !important;
        box-shadow: 0 4px 20px rgba(15, 52, 96, 0.3) !important;
        -webkit-tap-highlight-color: transparent;
    }
}

/* ----- Chat panel: mobile-first ----- */
.page-ai-companion:not(.dark-mode) .ai-chat-area {
    background: var(--bg-white) !important;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: min(70dvh, 520px);
}
.ai-chat-area .chat-container {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    background: var(--bg-white);
}

/* Chat header: same style as sidebar header */
.ai-chat-area .chat-header {
    flex-shrink: 0;
    border-bottom: var(--ai-panel-border);
    padding: 0.65rem 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.ai-chat-area .chat-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    min-height: 44px;
    min-width: 0;
}
/* Pills take only remaining space so they never go behind fullscreen */
.ai-chat-area .chat-header-pills {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    min-width: 0;
    flex: 1;
    overflow: hidden;
}
.ai-chat-area .chat-pill {
    display: inline-block;
    padding: 0.35rem 0.65rem;
    font-size: var(--ai-body-size);
    font-weight: var(--ai-font-weight-body);
    background: var(--ai-panel-bg);
    border: var(--ai-panel-border);
    border-radius: var(--radius-pill, 999px);
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.ai-chat-area .chat-pill-exam { max-width: 10em; }
.ai-chat-area .chat-pill-mode { max-width: 12em; }
/* On small screens: tighter max-width so both pills stay left of fullscreen */
@media (max-width: 768px) {
    .ai-chat-area .chat-header-pills {
        flex-wrap: nowrap;
    }
    .ai-chat-area .chat-pill-exam { max-width: 7em; }
    .ai-chat-area .chat-pill-mode { max-width: 8em; }
}
.ai-chat-area .output-mode-bar {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: wrap;
}
.ai-chat-area .output-mode-btn {
    padding: 0.35rem 0.6rem;
    font-size: var(--ai-body-size);
    font-weight: var(--ai-font-weight-body);
    background: var(--ai-panel-bg);
    border: var(--ai-panel-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}
.ai-chat-area .output-mode-btn:hover:not(:disabled) {
    background: var(--bg-light);
    border-color: var(--accent-color);
    color: var(--accent-color);
}
.ai-chat-area .output-mode-btn.active {
    background: var(--accent-soft);
    border-color: var(--accent-color);
    color: var(--accent-color);
}
.ai-chat-area .output-mode-btn-disabled {
    cursor: not-allowed;
    opacity: 0.6;
}
.ai-chat-area .output-mode-btn-disabled::after {
    content: ' (Coming Soon)';
    font-size: 0.7em;
    opacity: 0.9;
}
/* Fullscreen: match chat pills; on mobile icon-only, clean pill */
.ai-chat-area .fullscreen-toggle {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.4rem 0.65rem;
    min-width: 44px;
    min-height: 44px;
    font-size: var(--ai-body-size);
    font-weight: var(--ai-font-weight-body);
    background: var(--ai-panel-bg);
    border: var(--ai-panel-border);
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}
.ai-chat-area .fullscreen-toggle:hover {
    background: var(--bg-light);
    border-color: var(--accent-color);
    color: var(--accent-color);
}
.ai-chat-area .fullscreen-icon { font-size: 1rem; line-height: 1; }
/* Mobile: fullscreen = same pill as exam/mode, icon only */
@media (max-width: 768px) {
    .ai-chat-area .fullscreen-toggle {
        padding: 0.4rem;
        min-width: 44px;
        min-height: 44px;
        border-radius: 999px;
        background: var(--bg-white);
        border: 1px solid var(--border-color);
        color: var(--text-secondary);
    }
    .ai-chat-area .fullscreen-text { display: none; }
    .ai-chat-area .fullscreen-toggle .fullscreen-icon {
        font-size: 1.15rem;
        margin: 0;
    }
}
@media (min-width: 769px) {
    .ai-chat-area .fullscreen-text { display: inline; }
}

/* Chat messages: scrollable content */
.ai-chat-area .chat-messages {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.85rem 0.75rem;
    -webkit-overflow-scrolling: touch;
}

/* Welcome message: typography hierarchy */
.ai-chat-area .welcome-message {
    color: var(--text-primary);
    text-align: center;
    padding: 0.5rem 0;
}
.ai-chat-area .welcome-icon {
    margin-bottom: 0.5rem;
    display: block;
}
.ai-chat-area .welcome-avatar {
    width: 64px;
    height: 64px;
    object-fit: contain;
    border-radius: 50%;
    display: block;
    margin: 0 auto;
}
.ai-chat-area .welcome-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary) !important;
    margin: 0 0 0.45rem;
    line-height: 1.3;
}
.ai-chat-area .welcome-lead {
    font-size: 0.9rem;
    color: var(--text-secondary) !important;
    margin: 0 0 0.6rem;
    line-height: 1.4;
}
.ai-chat-area .welcome-instruction {
    font-size: 0.875rem;
    color: var(--text-secondary) !important;
    margin: 0 0 0.35rem;
    line-height: 1.4;
}
.ai-chat-area .welcome-features {
    list-style: none;
    padding: 0;
    margin: 0 0 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary) !important;
    text-align: left;
    max-width: 20em;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.45;
}
.ai-chat-area .welcome-features li { margin-bottom: 0.3rem; }
.ai-chat-area .welcome-features strong { color: var(--text-primary); }
.ai-chat-area .welcome-tip {
    font-size: 0.8125rem;
    color: var(--text-secondary) !important;
    margin: 0;
    padding: 0.5rem 0.7rem;
    background: rgba(255, 193, 7, 0.08);
    border: 1px solid rgba(255, 193, 7, 0.22);
    border-radius: var(--radius-sm);
    display: inline-block;
    line-height: 1.4;
}
/* Chat header pills use --ai-body-size and --ai-text-muted from unified block */

/* Input area: one bar, mobile-first */
.ai-chat-area .chat-input-container {
    flex-shrink: 0;
    padding: 0.5rem 0.75rem;
    padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
}
.ai-chat-area .chat-input-bar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 48px;
    padding: 0.35rem 0.4rem 0.35rem 0.5rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.ai-chat-area .chat-input-bar:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.1);
}
.ai-chat-area .chat-input-action {
    flex-shrink: 0;
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0 0.35rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    background: transparent;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}
.ai-chat-area .chat-input-action:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--accent-color);
}
/* Voice button: mike icon only (background-image so it always shows) */
.ai-chat-area .voice-input-btn .voice-btn-icon {
    display: block;
    width: 32px;
    height: 32px;
    background: url('assets/icons/mike_icon.png') center/contain no-repeat;
    flex-shrink: 0;
}
.ai-chat-area .voice-input-btn {
    padding: 0;
    min-width: 44px;
    justify-content: center;
}
.ai-chat-area .voice-input-btn.listening {
    background: rgba(220, 53, 69, 0.15);
}
.ai-chat-area .voice-input-btn.listening .voice-btn-icon {
    filter: brightness(0) saturate(100%) invert(25%) sepia(90%) saturate(2000%) hue-rotate(350deg);
}
.ai-chat-area .send-icon {
    width: 22px;
    height: 22px;
    object-fit: contain;
    filter: brightness(0) invert(1);
    opacity: 0.95;
}
.ai-chat-area .send-btn:disabled .send-icon {
    opacity: 0.6;
}
.ai-chat-area .chat-input {
    flex: 1;
    min-width: 0;
    min-height: 44px;
    padding: 0.5rem 0.25rem;
    font-size: 16px;
    line-height: 1.4;
    color: var(--text-primary);
    background: transparent;
    border: none;
    resize: none;
    outline: none;
}
.ai-chat-area .chat-input::placeholder {
    color: var(--text-light);
}
.ai-chat-area .chat-send-btn,
.ai-chat-area .send-btn {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    font-size: 1.1rem;
    color: #fff;
    background: var(--accent-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.15s ease;
    -webkit-tap-highlight-color: transparent;
}
.ai-chat-area .chat-send-btn:hover:not(:disabled),
.ai-chat-area .send-btn:hover:not(:disabled) {
    background: #0052cc;
}
.ai-chat-area .chat-send-btn:disabled,
.ai-chat-area .send-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}
.ai-chat-area .chat-status {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.35rem;
    padding-left: 0.25rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* Desktop: slightly larger panel and spacing */
@media (min-width: 769px) {
    .page-ai-companion:not(.dark-mode) .ai-chat-area { min-height: 560px; }
    .ai-chat-area .chat-header {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
        padding: 0.65rem 1rem;
        gap: 0.5rem 0.75rem;
    }
    .ai-chat-area .chat-header-top { flex: 1; min-width: 0; }
    .ai-chat-area .chat-pill { font-size: 0.85rem; padding: 0.4rem 0.7rem; }
    .ai-chat-area .chat-pill-exam { max-width: 14em; }
    .ai-chat-area .output-mode-bar { order: 0; }
    .ai-chat-area .chat-messages { padding: 1rem 1.25rem; }
    .ai-chat-area .welcome-message { padding: 1rem 0; }
    .ai-chat-area .welcome-avatar { width: 80px; height: 80px; }
    .ai-chat-area .welcome-title { font-size: 1.35rem; }
    .ai-chat-area .welcome-lead { font-size: 0.95rem; }
    .ai-chat-area .welcome-features { font-size: 0.9rem; max-width: none; }
    .ai-chat-area .welcome-tip { font-size: 0.85rem; padding: 0.6rem 0.8rem; }
    .ai-chat-area .chat-input-container { padding: 0.65rem 1rem; padding-bottom: max(0.65rem, env(safe-area-inset-bottom)); }
    .ai-chat-area .chat-input-bar {
        padding: 0.4rem 0.5rem 0.4rem 0.65rem;
        gap: 0.5rem;
        min-height: 52px;
        border-radius: 999px;
    }
    .ai-chat-area .chat-input-action { width: 46px; height: 46px; font-size: 1.2rem; }
    .ai-chat-area .chat-send-btn,
    .ai-chat-area .send-btn { width: 46px; height: 46px; font-size: 1.15rem; }
    .ai-chat-area .chat-status { font-size: 0.82rem; }
}

/* Mobile sidebar toggle */
.mobile-sidebar-toggle {
    background: var(--accent-color) !important;
    color: #fff !important;
    border: none;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-md);
    min-width: 44px;
    min-height: 44px;
}
.mobile-sidebar-toggle:hover { background: #0052cc !important; }