/* ==========================================================================
   NEXUS AI - DESIGN SYSTEM & STYLESHEET
   Aesthetics: Sleek Dark Glassmorphism, Electric Purple & Cyan Gradients
   ========================================================================== */

:root {
    /* Color Palette */
    --bg-dark: #090d16;
    --bg-surface: #0f172a;
    --bg-glass: rgba(15, 23, 42, 0.75);
    --bg-glass-hover: rgba(30, 41, 59, 0.85);
    --bg-card: rgba(255, 255, 255, 0.03);
    
    /* Accents & Gradients */
    --accent-purple: #8b5cf6;
    --accent-purple-glow: rgba(139, 92, 246, 0.4);
    --accent-cyan: #06b6d4;
    --accent-cyan-glow: rgba(6, 182, 212, 0.4);
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;

    --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    --gradient-border: linear-gradient(135deg, rgba(139, 92, 246, 0.5), rgba(6, 182, 212, 0.5));
    --gradient-glow: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.15) 0%, transparent 70%);

    /* Typography */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* Borders & Shadows */
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 255, 255, 0.15);
    --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(139, 92, 246, 0.2);

    /* Radii & Transitions */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
    height: 100vh;
    display: flex;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Application Layout */
.app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
    background: var(--gradient-glow);
}

/* SIDEBAR COMPONENT */
.sidebar {
    width: 260px;
    background: rgba(10, 15, 26, 0.95);
    border-right: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
    padding: 20px 16px;
    transition: var(--transition);
    z-index: 20;
    backdrop-filter: blur(16px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 8px 20px 8px;
    border-bottom: 1px solid var(--border-glass);
    margin-bottom: 16px;
}

.brand-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    box-shadow: var(--shadow-glow);
}

.brand-text h1 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.brand-text h1 span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-tag {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
}

.btn-new-thread {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    border: none;
    color: #fff;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.35);
    transition: var(--transition);
    margin-bottom: 20px;
}

.btn-new-thread:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(139, 92, 246, 0.5);
}

.sidebar-section-title {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin: 12px 8px 8px 8px;
}

.focus-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 20px;
}

.focus-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.focus-nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.focus-nav-item.active {
    background: rgba(139, 92, 246, 0.12);
    color: var(--text-primary);
    border-color: rgba(139, 92, 246, 0.3);
}

.focus-nav-item i {
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

.thread-history-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.thread-item {
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.thread-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.thread-item.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    font-weight: 600;
}

.thread-item-title {
    overflow: hidden;
    text-overflow: ellipsis;
}

.thread-del-btn {
    opacity: 0;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.thread-item:hover .thread-del-btn {
    opacity: 1;
}

.thread-del-btn:hover {
    color: var(--accent-rose);
}

.sidebar-footer {
    padding-top: 16px;
    border-top: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-sidebar-footer {
    width: 100%;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-sidebar-footer:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

/* MAIN WORKSPACE & SEARCH INTERFACE */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.top-header {
    height: 64px;
    padding: 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-glass);
    background: rgba(9, 13, 22, 0.6);
    backdrop-filter: blur(12px);
    z-index: 10;
}

.model-badge-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.model-indicator-pill {
    background: rgba(139, 92, 246, 0.12);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--text-primary);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.model-indicator-pill * {
    pointer-events: none !important;
}

.model-indicator-pill:hover {
    background: rgba(139, 92, 246, 0.25);
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.3);
}

.pro-toggle-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border-glass);
}

.toggle-switch:checked {
    background: var(--gradient-primary);
    border-color: transparent;
}

.toggle-switch::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    background: #fff;
    transition: var(--transition);
}

.toggle-switch:checked::before {
    transform: translateX(20px);
}

.view-scroll-area {
    flex: 1;
    overflow-y: auto;
    padding: 30px 20%;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

@media (max-width: 1200px) {
    .view-scroll-area {
        padding: 30px 10%;
    }
}

@media (max-width: 768px) {
    .view-scroll-area {
        padding: 20px 16px;
    }
}

.empty-hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 40px 0;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.hero-title span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 580px;
    margin-bottom: 32px;
}

.suggested-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
    width: 100%;
    max-width: 800px;
}

.suggested-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
    z-index: 5;
    pointer-events: auto;
}

.suggested-card * {
    pointer-events: none !important;
}

.suggested-card:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
    box-shadow: var(--shadow-subtle);
}

.suggested-card-icon {
    color: var(--accent-cyan);
    font-size: 1.1rem;
}

.suggested-card-text {
    font-size: 0.88rem;
    color: var(--text-primary);
    font-weight: 600;
}

.suggested-card-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.query-thread-block {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.user-query-heading {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-query-heading i {
    color: var(--accent-purple);
    font-size: 1.2rem;
}

.sources-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sources-header {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
}

.source-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.source-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.source-card-top {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.source-card-num {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
}

.source-card-title {
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.ai-answer-box {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 24px;
    line-height: 1.7;
    font-size: 0.98rem;
    box-shadow: var(--shadow-subtle);
}

.ai-answer-box h1, .ai-answer-box h2, .ai-answer-box h3 {
    font-family: var(--font-heading);
    margin: 16px 0 10px 0;
    color: var(--text-primary);
}

.ai-answer-box h3 { font-size: 1.15rem; }
.ai-answer-box p { margin-bottom: 14px; }
.ai-answer-box ul, .ai-answer-box ol { margin: 10px 0 14px 24px; }
.ai-answer-box li { margin-bottom: 6px; }

.ai-answer-box code {
    background: rgba(0, 0, 0, 0.4);
    color: #38bdf8;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.88rem;
}

.ai-answer-box pre {
    background: #050811;
    border: 1px solid var(--border-glass);
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 14px 0;
}

.ai-answer-box pre code {
    background: transparent;
    padding: 0;
    color: #e2e8f0;
}

.citation-ref {
    display: inline-block;
    background: rgba(139, 92, 246, 0.2);
    color: #c4b5fd;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 4px;
    margin: 0 2px;
    cursor: pointer;
    vertical-align: super;
}

.related-questions-wrapper {
    margin-top: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.related-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.related-chips {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.related-chip-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    text-align: left;
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.related-chip-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.bottom-search-wrapper {
    padding: 16px 20%;
    background: rgba(9, 13, 22, 0.8);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-glass);
    position: relative;
    z-index: 15;
}

@media (max-width: 1200px) {
    .bottom-search-wrapper {
        padding: 16px 10%;
    }
}

@media (max-width: 768px) {
    .bottom-search-wrapper {
        padding: 12px 16px;
    }
}

.search-box-container {
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.6);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.search-box-container:focus-within {
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 0 25px rgba(139, 92, 246, 0.25);
}

.search-input-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-actions-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 10px;
}

.focus-pills-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.focus-pill {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.focus-pill:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.focus-pill.active {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
    border-color: rgba(139, 92, 246, 0.4);
}

.submit-btn-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-submit-search {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.4);
}

.btn-submit-search:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
}

/* MODAL DIALOGS (SETTINGS) */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-backdrop.active {
    opacity: 1;
    pointer-events: all;
}

.modal-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 580px;
    padding: 28px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.4rem;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input, .form-group select {
    background-color: rgba(15, 23, 42, 0.95);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
}

.form-group select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394A3B8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 14px top 50%;
    background-size: 10px auto;
    padding-right: 36px;
    cursor: pointer;
}

select option {
    background-color: #0f172a !important;
    color: #f8fafc !important;
    padding: 10px 14px;
}

select option:hover,
select option:checked {
    background-color: #1e293b !important;
    color: #38bdf8 !important;
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.3);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    color: #fff;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    cursor: pointer;
}

/* SPEND TICKER & TELEMETRY BADGES */
.spend-ticker-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.3);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: #fcd34d;
    cursor: help;
}

/* EFFORT SELECTOR PILLS */
.effort-pills-group {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 0, 0, 0.3);
    padding: 4px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-glass);
}

.effort-label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    padding: 0 4px 0 8px;
    display: flex;
    align-items: center;
    gap: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.effort-pill {
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
    border: 1px solid transparent;
}

.effort-pill:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.effort-pill.active {
    background: rgba(139, 92, 246, 0.2);
    border-color: rgba(139, 92, 246, 0.5);
    color: #fff;
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.25);
}

.effort-pill[data-effort="auto"].active {
    background: rgba(6, 182, 212, 0.2);
    border-color: rgba(6, 182, 212, 0.5);
    color: #67e8f9;
}

.effort-pill[data-effort="low"].active {
    background: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.5);
    color: #6ee7b7;
}

.effort-pill[data-effort="high"].active {
    background: rgba(244, 63, 94, 0.2);
    border-color: rgba(244, 63, 94, 0.5);
    color: #fda4af;
}

.latency-sub-tag {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
    font-family: var(--font-mono);
    text-transform: none;
    letter-spacing: 0;
}

.latency-sub-tag.emerald {
    color: #34d399;
    background: rgba(16, 185, 129, 0.15);
}

.latency-sub-tag.cyan {
    color: #38bdf8;
    background: rgba(6, 182, 212, 0.15);
}

.latency-sub-tag.purple {
    color: #c4b5fd;
    background: rgba(139, 92, 246, 0.15);
}

/* ANSWER METRICS & TELEMETRY FOOTER */
.telemetry-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.telemetry-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    font-family: var(--font-mono);
    font-size: 0.73rem;
}

.telemetry-badge.cost {
    background: rgba(16, 185, 129, 0.12);
    border-color: rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.telemetry-badge.effort {
    background: rgba(6, 182, 212, 0.12);
    border-color: rgba(6, 182, 212, 0.3);
    color: #38bdf8;
}

.telemetry-badge.model {
    background: rgba(139, 92, 246, 0.12);
    border-color: rgba(139, 92, 246, 0.3);
    color: #c4b5fd;
}

/* CHAT WINDOW INLINE MODEL SELECTOR */
.chat-model-picker-container {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.chat-model-picker-container:hover {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(139, 92, 246, 0.4);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.2);
}

.chat-model-select {
    background: #0f172a !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    color: #f8fafc !important;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 700;
    outline: none;
    cursor: pointer;
    padding: 4px 10px !important;
    border-radius: var(--radius-full) !important;
    appearance: menulist !important;
    -webkit-appearance: menulist !important;
}

.chat-model-select optgroup {
    background-color: #0b1120 !important;
    color: #38bdf8 !important;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 8px 6px 4px 6px;
}

.chat-model-select option {
    background-color: #0f172a !important;
    color: #f8fafc !important;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 8px 14px;
}

.chat-model-select option:checked {
    background-color: #1e293b !important;
    color: #38bdf8 !important;
    font-weight: 700;
}

.btn-api-keys-icon {
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #fcd34d;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
}

.btn-api-keys-icon:hover {
    background: rgba(245, 158, 11, 0.25);
    border-color: rgba(245, 158, 11, 0.5);
    transform: scale(1.08);
}

.btn-refresh-models-icon {
    background: transparent;
    border: none;
    color: var(--accent-cyan);
    cursor: pointer;
    font-size: 0.75rem;
    padding: 2px 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.btn-refresh-models-icon:hover {
    color: #67e8f9;
    transform: rotate(180deg);
}

/* CHAT WINDOW EFFORT SELECTOR DROPDOWN */
.effort-picker-container {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.effort-picker-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.effort-picker-container:hover {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(6, 182, 212, 0.4);
    box-shadow: 0 0 12px rgba(6, 182, 212, 0.2);
}

.chat-effort-select {
    background: #0f172a !important;
    border: 1px solid rgba(6, 182, 212, 0.3) !important;
    color: #67e8f9 !important;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 700;
    outline: none;
    cursor: pointer;
    padding: 4px 10px !important;
    border-radius: var(--radius-full) !important;
    appearance: menulist !important;
    -webkit-appearance: menulist !important;
}

.chat-effort-select option {
    background-color: #0f172a !important;
    color: #f8fafc !important;
    font-size: 0.83rem;
    font-weight: 500;
    padding: 8px 12px;
}

.chat-effort-select option:checked {
    background-color: #1e293b !important;
    color: #67e8f9 !important;
    font-weight: 700;
}

/* SEARCH BOX PRO SEARCH TOGGLE */
.pro-toggle-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.pro-toggle-wrapper:hover {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(139, 92, 246, 0.4);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.2);
}

.pro-toggle-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
}

/* ==========================================================================
   MOBILE & TABLET RESPONSIVE DESIGN SYSTEM
   ========================================================================== */

/* Mobile Toggle Buttons & Overlay */
.btn-mobile-toggle {
    display: none;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-mobile-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--accent-cyan);
}

.btn-mobile-close {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 4px;
}

.btn-mobile-close:hover {
    color: var(--accent-pink);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
    pointer-events: auto;
}

/* Tablet & Mobile Screens (under 900px) */
@media (max-width: 900px) {
    .btn-mobile-toggle {
        display: flex;
    }

    .btn-mobile-close {
        display: flex;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: -280px;
        width: 280px;
        height: 100vh;
        z-index: 100;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.7);
    }

    .sidebar.active {
        left: 0;
    }

    .top-header {
        padding: 12px 16px;
    }

    .view-scroll-area {
        padding: 16px 16px 120px 16px;
    }

    .hero-title {
        font-size: 2rem !important;
    }

    .hero-subtitle {
        font-size: 0.9rem !important;
        padding: 0 10px;
    }

    .suggested-cards-grid {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
    }

    .bottom-search-wrapper {
        padding: 10px 12px !important;
    }

    .search-box-container {
        padding: 10px 12px !important;
    }

    .search-actions-row {
        flex-wrap: wrap;
        gap: 8px;
    }

    .search-action-group {
        flex-wrap: wrap;
        gap: 6px;
    }

    .model-picker-container,
    .effort-picker-container,
    .pro-toggle-wrapper {
        padding: 3px 8px !important;
    }

    .chat-model-select,
    .chat-effort-select {
        font-size: 0.72rem !important;
    }

    .sources-grid {
        grid-template-columns: 1fr !important;
    }

    .telemetry-bar {
        flex-wrap: wrap;
        justify-content: center;
        gap: 6px;
    }

    .telemetry-badge {
        font-size: 0.72rem;
        padding: 3px 8px;
    }

    .modal-box {
        width: 92% !important;
        max-height: 88vh !important;
        padding: 18px 16px !important;
    }
}

/* Mobile Phones (under 480px) */
@media (max-width: 480px) {
    .brand-text h1 {
        font-size: 1.1rem !important;
    }

    .hero-title {
        font-size: 1.45rem !important;
    }

    .search-input {
        font-size: 0.88rem !important;
    }

    .modal-footer {
        flex-direction: column;
        gap: 8px;
    }

    .modal-footer button {
        width: 100%;
    }
}

/* Mobile Phone Displays (under 600px) - Ultra-Clean Perplexity Style */
@media (max-width: 600px) {
    .spend-ticker-pill {
        display: none !important;
    }

    .top-header {
        padding: 8px 12px !important;
    }

    .model-indicator-pill {
        padding: 4px 10px !important;
        font-size: 0.76rem !important;
        max-width: 220px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .empty-hero {
        padding: 10px 0 !important;
    }

    .hero-title {
        font-size: 1.45rem !important;
        line-height: 1.25 !important;
        margin-bottom: 6px !important;
    }

    .hero-subtitle {
        font-size: 0.8rem !important;
        line-height: 1.35 !important;
        margin-bottom: 12px !important;
        padding: 0 4px !important;
    }

    .privacy-badge-banner {
        display: none !important;
    }

    .suggested-cards-grid {
        grid-template-columns: 1fr !important;
        gap: 8px !important;
        margin-top: 10px !important;
    }

    .suggested-card {
        padding: 10px 12px !important;
        border-radius: var(--radius-md) !important;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .suggested-card-sub {
        display: none !important;
    }

    .suggested-card-text {
        font-size: 0.82rem !important;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .suggested-card-icon {
        font-size: 0.9rem !important;
        margin-bottom: 0 !important;
    }

    .bottom-search-wrapper {
        padding: 8px 10px !important;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100vw;
    }

    .search-box-container {
        padding: 8px 10px !important;
        gap: 6px !important;
        border-radius: 16px !important;
    }

    .search-input {
        font-size: 0.88rem !important;
        padding: 4px 0 !important;
    }

    .search-actions-row {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: space-between !important;
        gap: 6px !important;
        border-top: none !important;
        padding-top: 2px !important;
    }

    .chat-model-picker-container {
        max-width: 48% !important;
        padding: 2px 6px !important;
    }

    .chat-model-select {
        font-size: 0.7rem !important;
        max-width: 110px !important;
    }

    .effort-picker-container {
        max-width: 48% !important;
        padding: 2px 6px !important;
    }

    .effort-picker-label {
        display: none !important;
    }

    .chat-effort-select {
        font-size: 0.7rem !important;
        max-width: 100px !important;
    }

    .btn-search-send {
        width: 32px !important;
        height: 32px !important;
        font-size: 0.82rem !important;
    }

    /* Compact Chat Window Scaling for Mobile Phones */
    .user-query-heading {
        font-size: 1.05rem !important;
        margin-bottom: 12px !important;
    }

    .reasoning-agent-banner {
        font-size: 0.76rem !important;
        padding: 6px 10px !important;
        margin-bottom: 12px !important;
    }

    .ai-answer-box {
        font-size: 0.88rem !important;
        line-height: 1.45 !important;
        padding: 12px 14px !important;
        border-radius: var(--radius-md) !important;
    }

    .ai-answer-box h3 {
        font-size: 1rem !important;
        margin-top: 10px !important;
        margin-bottom: 6px !important;
    }

    .ai-answer-box h4 {
        font-size: 0.92rem !important;
        margin-top: 8px !important;
        margin-bottom: 4px !important;
    }

    .ai-answer-box p,
    .ai-answer-box ul,
    .ai-answer-box ol {
        font-size: 0.86rem !important;
        line-height: 1.4 !important;
        margin-bottom: 8px !important;
    }

    .source-card {
        padding: 8px 10px !important;
    }

    .source-card-title {
        font-size: 0.8rem !important;
    }

    .telemetry-bar {
        padding: 6px 8px !important;
        gap: 4px !important;
    }

    .telemetry-badge {
        font-size: 0.68rem !important;
        padding: 2px 6px !important;
    }
}