/* ==========================================================================
   OFFICIAL GOOGLE GEMINI CHATBOT UI REPLICA
   Theme Palette: Warm Beige Canvas, Soft Light Pink Accents, Crisp Black Typography
   ========================================================================== */

:root {
    /* Color System */
    --bg-canvas: #FAF6F0;          /* Warm Beige main background */
    --bg-sidebar: #F3ECE2;         /* Slightly deeper beige sidebar */
    --bg-surface: #FFFFFF;         /* Crisp white cards & surfaces */
    --bg-pink-tint: #FBEFEF;       /* Light pink tinted surface */

    /* Pink Palette */
    --pink-primary: #E8A0BF;       /* Vibrant soft pink */
    --pink-accent: #F5CAC3;        /* Warm light pink accent */
    --pink-light: #F8D7DA;         /* Light pastel pink */
    --pink-bubble: #FCE8E8;        /* User chat bubble light pink */

    /* Typography & Contrast (Crisp Black as requested) */
    --text-primary: #111111;       /* Pure rich black for text readability */
    --text-secondary: #2D2B2A;     /* Dark charcoal text */
    --text-muted: #66605C;         /* Muted grey-black */

    /* Borders & Shadows */
    --border-color: #E6DBCF;       /* Soft beige border */
    --border-pink: #F3C1C6;        /* Light pink border */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);

    /* Fonts & Radii */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --font-mono: 'Fira Code', monospace;

    --sidebar-width: 270px;
    --sidebar-collapsed-width: 72px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --radius-pill: 9999px;

    --transition: all 0.22s cubic-bezier(0.2, 0, 0, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-canvas);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: transparent;
}

textarea, input {
    font-family: inherit;
    color: inherit;
    border: none;
    outline: none;
}

/* Base Icon Button */
.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--pink-light);
}

/* App Layout Grid */
.app-layout {
    display: flex;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    position: relative;
}

/* ==========================================================================
   1. GEMINI SIDEBAR (COLLAPSIBLE)
   ========================================================================== */
.sidebar {
    width: var(--sidebar-width);
    height: 100%;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 0.85rem;
    z-index: 100;
    transition: var(--transition);
    flex-shrink: 0;
}

/* Collapsed Sidebar State */
.app-layout.sidebar-collapsed .sidebar {
    width: var(--sidebar-collapsed-width);
}

.app-layout.sidebar-collapsed .brand-title,
.app-layout.sidebar-collapsed .btn-label,
.app-layout.sidebar-collapsed .sidebar-section-header,
.app-layout.sidebar-collapsed .cat-label {
    display: none !important;
}

.sidebar-top {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding-bottom: 1rem;
}

.brand-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
}

.brand-title i {
    color: var(--pink-primary);
    font-size: 1.25rem;
}

/* Inline non-clickable API Key Active badge next to Gemini title */
.api-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid var(--border-color);
    padding: 0.15rem 0.45rem;
    border-radius: var(--radius-pill);
    margin-left: 0.2rem;
    pointer-events: none; /* Non-clickable */
    user-select: none;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: #38A169;
    box-shadow: 0 0 4px rgba(56, 161, 105, 0.5);
    flex-shrink: 0;
}

/* "+ New chat" Button */
.new-chat-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-pink);
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.85rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    margin-bottom: 1.25rem;
}

.new-chat-btn:hover {
    background: var(--pink-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.new-chat-btn i {
    font-size: 1rem;
    color: var(--pink-primary);
}

.sidebar-scroll {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-right: 2px;
}

.sidebar-scroll::-webkit-scrollbar {
    width: 4px;
}
.sidebar-scroll::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.sidebar-section-header {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    padding: 0.4rem 0.5rem 0.1rem 0.5rem;
}

/* Sidebar Capabilities Menu */
.category-menu {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: 0.88rem;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
}

.category-item:hover {
    background: var(--bg-surface);
    transform: translateX(2px);
}

.cat-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--pink-light);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}


/* ==========================================================================
   2. MAIN CONTENT AREA
   ========================================================================== */
.main-content {
    flex-grow: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-canvas);
    position: relative;
    overflow: hidden;
}

/* Top Navigation Bar */
.top-bar {
    height: 60px;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 20;
    position: relative;
}

.top-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* TOP CENTER BRANDING LOGO & PROTOTYPE TAG */
.top-center-brand {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-pink);
    padding: 0.3rem 0.85rem;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-sm);
    user-select: none;
}

.center-brand-logo {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--text-primary), var(--pink-primary));
    color: var(--bg-canvas);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.center-brand-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.center-title {
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.prototype-tag {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--pink-light);
    border: 1px solid var(--border-pink);
    padding: 0.1rem 0.45rem;
    border-radius: var(--radius-pill);
    letter-spacing: 0.2px;
}

.mobile-menu-toggle {
    display: none;
}

/* Model Selector Floating Pill */
.model-selector-container {
    position: relative;
}

.model-pill-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-pink);
    border-radius: var(--radius-pill);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.model-pill-btn:hover {
    background: var(--pink-light);
    box-shadow: var(--shadow-md);
}

.model-pill-btn i {
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: var(--transition);
}

/* Model Dropdown Menu */
.model-dropdown {
    position: absolute;
    top: 50px;
    left: 0;
    width: 280px;
    background: var(--bg-surface);
    border: 1px solid var(--border-pink);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 90;
    padding: 0.5rem;
    animation: dropDown 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.dropdown-header {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 0.4rem 0.6rem;
}

.model-options-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.model-opt-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.model-opt-item:hover {
    background: var(--pink-tint);
}

.model-opt-item.selected {
    background: var(--pink-light);
}

.model-opt-text {
    display: flex;
    flex-direction: column;
}

.model-opt-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
}

.model-opt-desc {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.model-check-icon {
    color: var(--pink-primary);
    font-size: 0.9rem;
    display: none;
}

.model-opt-item.selected .model-check-icon {
    display: block;
}

.top-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}


/* ==========================================================================
   3. CHAT VIEWPORT & GREETING HERO
   ========================================================================== */
.chat-viewport {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem 1.5rem 120px 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    scroll-behavior: smooth;
}

.chat-viewport::-webkit-scrollbar {
    width: 6px;
}
.chat-viewport::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 6px;
}

/* Greeting Hero Screen */
.greeting-hero {
    max-width: 820px;
    width: 100%;
    margin: auto 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: fadeIn 0.35s ease-out;
}

.greeting-header {
    margin-bottom: 2.5rem;
}

.greeting-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    line-height: 1.15;
    background: linear-gradient(135deg, #111111 40%, var(--pink-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.greeting-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 0.5rem;
}

/* 5 Capability Cards Grid */
.capability-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    width: 100%;
}

.cap-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.2rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.cap-card:hover {
    border-color: var(--pink-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: var(--bg-pink-tint);
}

.cap-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    margin-bottom: 0.85rem;
}

.cat-pink {
    background: var(--pink-light);
    color: var(--text-primary);
}

.cat-beige {
    background: var(--border-color);
    color: var(--text-primary);
}

.cap-card h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.cap-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}


/* ==========================================================================
   4. CONVERSATION MESSAGES STREAM
   ========================================================================== */
.messages-container {
    max-width: 820px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.message-row {
    display: flex;
    gap: 1.25rem;
    width: 100%;
    animation: slideUp 0.25s ease-out;
}

.message-row.user {
    justify-content: flex-end;
}

.sparkle-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--pink-primary), var(--pink-accent));
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    flex-shrink: 0;
    margin-top: 4px;
}

.message-body {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    max-width: 88%;
}

.message-row.user .message-body {
    align-items: flex-end;
}

/* User Message Bubble */
.user-bubble {
    background-color: var(--pink-bubble);
    border: 1px solid var(--border-pink);
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-lg);
    border-top-right-radius: 4px;
    color: var(--text-primary);
    font-size: 0.96rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    word-break: break-word;
}

/* Gemini Assistant Response Block */
.assistant-content {
    color: var(--text-primary);
    font-size: 0.98rem;
    line-height: 1.65;
    word-break: break-word;
}

.assistant-content p {
    margin-bottom: 0.85rem;
}
.assistant-content p:last-child {
    margin-bottom: 0;
}

.assistant-content ul, .assistant-content ol {
    margin: 0.6rem 0 0.85rem 1.5rem;
}

.assistant-content h1, .assistant-content h2, .assistant-content h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    margin: 1.2rem 0 0.5rem 0;
}

/* Code Container & Copy Button */
.code-container {
    background: #FAF6F0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin: 0.85rem 0;
    overflow: hidden;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #F3ECE2;
    padding: 0.35rem 0.85rem;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.copy-code-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: transparent;
    font-size: 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    transition: var(--transition);
}

.copy-code-btn:hover {
    background: var(--pink-light);
}

.assistant-content pre {
    padding: 0.85rem;
    overflow-x: auto;
}

.assistant-content code {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    background: rgba(243, 193, 198, 0.3);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    color: var(--text-primary);
}

.assistant-content pre code {
    background: transparent;
    padding: 0;
}

/* Response Action Toolbar */
.response-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.4rem;
}

.action-btn-sm {
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: var(--transition);
}

.action-btn-sm:hover {
    background: var(--pink-light);
    color: var(--text-primary);
}

.model-used-tag {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-sidebar);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-pill);
    margin-left: auto;
}

/* Gemini Thinking Indicator */
.gemini-thinking {
    display: flex;
    align-items: center;
    gap: 1rem;
    max-width: 820px;
    width: 100%;
    margin-top: 1rem;
}

.thinking-text {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 600;
}

.thinking-bar {
    width: 120px;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--pink-primary), var(--pink-accent), var(--pink-primary));
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}


/* ==========================================================================
   5. GEMINI FLOATING BOTTOM INPUT CAPSULE
   ========================================================================== */
.input-container {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0 1.5rem 1rem 1.5rem;
    background: linear-gradient(180deg, rgba(250, 246, 240, 0) 0%, rgba(250, 246, 240, 0.95) 40%, #FAF6F0 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 30;
}

.input-capsule {
    max-width: 820px;
    width: 100%;
    background: var(--bg-surface);
    border: 1.5px solid var(--border-pink);
    border-radius: var(--radius-lg);
    padding: 0.4rem 0.6rem 0.4rem 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    transition: var(--transition);
}

.input-capsule:focus-within {
    border-color: var(--pink-primary);
    box-shadow: 0 8px 28px rgba(232, 160, 191, 0.35);
}

/* + Symbol Tool Button */
.plus-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--pink-light);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.plus-btn:hover {
    background: var(--pink-primary);
    transform: rotate(90deg);
}

/* Floating + Popup Action Menu */
.plus-popup-menu {
    position: absolute;
    bottom: 60px;
    left: 10px;
    width: 280px;
    background: var(--bg-surface);
    border: 1px solid var(--border-pink);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    z-index: 100;
    animation: popupUp 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.menu-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 0.35rem 0.6rem;
}

.menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    text-align: left;
}

.menu-item:hover {
    background: var(--pink-tint);
}

.menu-item i {
    color: var(--pink-primary);
    font-size: 0.95rem;
    width: 20px;
    text-align: center;
}

/* Chat Textarea */
#chatTextarea {
    flex-grow: 1;
    background: transparent;
    border: none;
    font-size: 0.96rem;
    color: var(--text-primary);
    resize: none;
    max-height: 140px;
    padding: 0.4rem 0;
    line-height: 1.4;
}

#chatTextarea::placeholder {
    color: var(--text-muted);
}

/* Send Action Button */
.send-action-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--text-primary);
    color: var(--bg-canvas);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.send-action-btn:hover {
    background: var(--pink-primary);
    color: var(--text-primary);
    transform: scale(1.05);
}

/* Disclaimer note with clickable link */
.disclaimer-note {
    font-size: 0.73rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
    text-align: center;
}

.disclaimer-note a {
    color: var(--text-primary);
    text-decoration: underline;
    font-weight: 600;
    transition: var(--transition);
}

.disclaimer-note a:hover {
    color: var(--pink-primary);
}

/* Helper Utilities */
.hidden { display: none !important; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.97); }
    to { opacity: 1; transform: scale(1); }
}

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

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

@keyframes popupUp {
    from { opacity: 0; transform: translateY(8px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        box-shadow: var(--shadow-lg);
    }
    
    .app-layout.mobile-sidebar-open .sidebar {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .greeting-title {
        font-size: 2.2rem;
    }
}