/* =============================================================================
   Samshodhana Mandiram — AI Chat Application (Gemini / ChatGPT Style)
   ============================================================================= */

:root {
    --ai-bg-main: #0f172a;
    --ai-bg-sidebar: #090d16;
    --ai-bg-card: rgba(30, 41, 59, 0.7);
    --ai-bg-input: #1e293b;
    --ai-border: rgba(255, 255, 255, 0.1);
    --ai-border-hover: rgba(255, 255, 255, 0.2);
    --ai-text-primary: #f8fafc;
    --ai-text-secondary: #94a3b8;
    --ai-text-muted: #64748b;
    --ai-accent: #0ea5e9;
    --ai-accent-hover: #38bdf8;
    --ai-accent-glow: rgba(14, 165, 233, 0.25);
    --ai-user-bubble: #1e3a8a;
    --ai-user-bubble-text: #ffffff;
    --ai-citation-bg: rgba(14, 165, 233, 0.08);
    --ai-citation-border: rgba(14, 165, 233, 0.25);
    --ai-sidebar-width: 280px;
    --ai-radius-lg: 18px;
    --ai-radius-md: 12px;
    --ai-radius-sm: 8px;
}

[data-theme="light"] {
    --ai-bg-main: #f8fafc;
    --ai-bg-sidebar: #f1f5f9;
    --ai-bg-card: #ffffff;
    --ai-bg-input: #ffffff;
    --ai-border: #e2e8f0;
    --ai-border-hover: #cbd5e1;
    --ai-text-primary: #0f172a;
    --ai-text-secondary: #475569;
    --ai-text-muted: #94a3b8;
    --ai-accent: #0284c7;
    --ai-accent-hover: #0369a1;
    --ai-accent-glow: rgba(2, 132, 199, 0.15);
    --ai-user-bubble: #0284c7;
    --ai-user-bubble-text: #ffffff;
    --ai-citation-bg: #f0f9ff;
    --ai-citation-border: #bae6fd;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--ai-bg-main);
    color: var(--ai-text-primary);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: flex;
}

/* App Layout */
.ai-app-container {
    display: flex;
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
}

/* Sidebar */
.ai-sidebar {
    width: var(--ai-sidebar-width);
    background-color: var(--ai-bg-sidebar);
    border-right: 1px solid var(--ai-border);
    display: flex;
    flex-direction: column;
    height: 100%;
    flex-shrink: 0;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
}

.ai-sidebar.collapsed {
    transform: translateX(-100%);
    position: absolute;
}

.sidebar-header {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--ai-border);
}

.brand-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--ai-text-primary);
}

.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: contain;
}

.brand-name {
    font-weight: 700;
    font-size: 15px;
    letter-spacing: -0.2px;
}

.brand-badge {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    background: var(--ai-accent-glow);
    color: var(--ai-accent);
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 4px;
}

.btn-new-chat {
    margin: 14px 16px;
    padding: 10px 16px;
    background: linear-gradient(135deg, var(--ai-accent) 0%, var(--ai-accent-hover) 100%);
    color: #ffffff;
    border: none;
    border-radius: var(--ai-radius-md);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--ai-accent-glow);
    transition: transform 0.15s, opacity 0.15s;
}

.btn-new-chat:hover {
    opacity: 0.95;
    transform: translateY(-1px);
}

.sidebar-section-title {
    padding: 10px 18px 4px 18px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--ai-text-muted);
}

.sidebar-history-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 12px;
    border-radius: var(--ai-radius-sm);
    color: var(--ai-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    group: relative;
    text-decoration: none;
}

.history-item:hover, .history-item.active {
    background: var(--ai-border);
    color: var(--ai-text-primary);
}

.history-item.active {
    font-weight: 600;
    border-left: 3px solid var(--ai-accent);
}

.history-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.history-actions {
    display: none;
    align-items: center;
    gap: 4px;
    margin-left: 6px;
}

.history-item:hover .history-actions {
    display: flex;
}

.history-action-btn {
    background: transparent;
    border: none;
    color: var(--ai-text-muted);
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 13px;
}

.history-action-btn:hover {
    color: var(--ai-text-primary);
    background: rgba(255, 255, 255, 0.1);
}

/* Sidebar Guest Notice */
.sidebar-guest-notice {
    margin: 12px 14px;
    padding: 14px;
    border-radius: var(--ai-radius-md);
    background: var(--ai-border);
    border: 1px dashed var(--ai-border-hover);
    text-align: center;
}

.sidebar-guest-notice p {
    font-size: 12px;
    color: var(--ai-text-secondary);
    margin-bottom: 10px;
}

.btn-sidebar-login {
    display: inline-block;
    padding: 6px 14px;
    border-radius: var(--ai-radius-sm);
    background: var(--ai-accent);
    color: #fff;
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 14px 16px;
    border-top: 1px solid var(--ai-border);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.back-to-portal-link {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--ai-text-secondary);
    text-decoration: none;
    padding: 8px 10px;
    border-radius: var(--ai-radius-sm);
    transition: background 0.15s, color 0.15s;
}

.back-to-portal-link:hover {
    background: var(--ai-border);
    color: var(--ai-text-primary);
}

.user-profile-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 4px;
}

.user-profile-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    overflow: hidden;
}

.user-avatar-badge {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--ai-accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

/* Main Chat Section */
.ai-main-chat {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    background-color: var(--ai-bg-main);
}

/* Top App Bar */
.ai-topbar {
    height: 56px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--ai-border);
    flex-shrink: 0;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-sidebar-toggle {
    background: transparent;
    border: none;
    color: var(--ai-text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--ai-radius-sm);
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-sidebar-toggle:hover {
    color: var(--ai-text-primary);
    background: var(--ai-border);
}

.model-title-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ai-text-primary);
}

.grounding-pulse-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 8px #10b981;
    animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.9); }
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--ai-border);
    color: var(--ai-text-secondary);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 15px;
}

/* Messages Area */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scroll-behavior: smooth;
}

.messages-content-wrap {
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Empty Hero State */
.hero-empty-state {
    text-align: center;
    margin: auto 0;
    padding: 40px 20px;
}

.hero-icon {
    font-size: 48px;
    margin-bottom: 16px;
    display: inline-block;
    filter: drop-shadow(0 4px 12px var(--ai-accent-glow));
}

.hero-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--ai-text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 15px;
    color: var(--ai-text-secondary);
    margin-bottom: 32px;
}

.starter-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
    text-align: left;
    max-width: 760px;
    margin: 0 auto;
}

.starter-card {
    background: var(--ai-bg-card);
    border: 1px solid var(--ai-border);
    border-radius: var(--ai-radius-md);
    padding: 16px;
    cursor: pointer;
    transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.starter-card:hover {
    border-color: var(--ai-accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--ai-accent-glow);
}

.starter-card-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--ai-accent);
    margin-bottom: 6px;
}

.starter-card-desc {
    font-size: 12px;
    color: var(--ai-text-secondary);
    line-height: 1.5;
}

/* Chat Messages */
.message-row {
    display: flex;
    gap: 14px;
    width: 100%;
}

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

.message-row.assistant {
    justify-content: flex-start;
}

.message-bubble {
    max-width: 85%;
    border-radius: var(--ai-radius-lg);
    line-height: 1.6;
    font-size: 15px;
    position: relative;
    word-break: break-word;
}

.message-row.user .message-bubble {
    background: var(--ai-user-bubble);
    color: var(--ai-user-bubble-text);
    padding: 12px 18px;
    border-bottom-right-radius: 4px;
}

.message-row.assistant .message-bubble {
    background: transparent;
    color: var(--ai-text-primary);
    padding: 4px 8px;
    width: 100%;
    max-width: 100%;
}

/* Citations & Sources (Zero Page Numbers) */
.sources-card {
    margin: 12px 0 16px 0;
    padding: 12px 16px;
    border-radius: var(--ai-radius-md);
    background: var(--ai-citation-bg);
    border: 1px solid var(--ai-citation-border);
}

.sources-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 700;
    color: var(--ai-accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.sources-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.citation-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 20px;
    background: var(--ai-bg-card);
    border: 1px solid var(--ai-border);
    font-size: 12px;
    color: var(--ai-text-primary);
    text-decoration: none;
    transition: border-color 0.15s, background 0.15s;
}

.citation-chip:hover {
    border-color: var(--ai-accent);
    background: var(--ai-border);
}

.citation-book {
    font-weight: 600;
}

.citation-action {
    color: var(--ai-accent);
    font-weight: 500;
    font-size: 11px;
}

/* Markdown Rendering Inside Assistant Bubbles */
.message-bubble h1, .message-bubble h2, .message-bubble h3 {
    margin: 16px 0 8px 0;
    color: var(--ai-text-primary);
    font-weight: 700;
}

.message-bubble h1 { font-size: 1.4em; }
.message-bubble h2 { font-size: 1.25em; }
.message-bubble h3 { font-size: 1.1em; }

.message-bubble p {
    margin-bottom: 12px;
}

.message-bubble ul, .message-bubble ol {
    margin: 8px 0 14px 24px;
}

.message-bubble li {
    margin-bottom: 6px;
}

.message-bubble blockquote {
    border-left: 3px solid var(--ai-accent);
    padding: 6px 14px;
    margin: 12px 0;
    color: var(--ai-text-secondary);
    background: var(--ai-border);
    border-radius: 0 var(--ai-radius-sm) var(--ai-radius-sm) 0;
}

.message-bubble code {
    font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 13px;
    background: var(--ai-border);
    padding: 2px 6px;
    border-radius: 4px;
}

.message-bubble pre {
    background: #020617;
    color: #e2e8f0;
    padding: 14px;
    border-radius: var(--ai-radius-sm);
    overflow-x: auto;
    margin: 12px 0;
}

.message-bubble pre code {
    background: transparent;
    padding: 0;
}

.message-bubble table {
    width: 100%;
    border-collapse: collapse;
    margin: 14px 0;
    font-size: 13px;
}

.message-bubble th, .message-bubble td {
    padding: 8px 12px;
    border: 1px solid var(--ai-border);
    text-align: left;
}

.message-bubble th {
    background: var(--ai-border);
    font-weight: 600;
}

/* Streaming Cursor Indicator */
.streaming-cursor::after {
    content: "▋";
    display: inline-block;
    color: var(--ai-accent);
    animation: blink 0.8s infinite;
    margin-left: 3px;
    font-size: 14px;
    vertical-align: baseline;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Assistant Action Bar */
.message-action-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.btn-msg-copy {
    background: transparent;
    border: none;
    color: var(--ai-text-muted);
    font-size: 12px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--ai-radius-sm);
    transition: color 0.15s, background 0.15s;
}

.btn-msg-copy:hover {
    color: var(--ai-text-primary);
    background: var(--ai-border);
}

/* Bottom Input Area */
.ai-bottom-container {
    padding: 12px 20px 20px 20px;
    flex-shrink: 0;
    background: var(--ai-bg-main);
}

.input-box-wrapper {
    max-width: 860px;
    margin: 0 auto;
    background: var(--ai-bg-input);
    border: 1px solid var(--ai-border);
    border-radius: var(--ai-radius-lg);
    padding: 8px 12px;
    display: flex;
    align-items: flex-end;
    gap: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.input-box-wrapper:focus-within {
    border-color: var(--ai-accent);
    box-shadow: 0 0 0 3px var(--ai-accent-glow);
}

.chat-input-textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--ai-text-primary);
    font-size: 15px;
    line-height: 1.5;
    padding: 8px 6px;
    resize: none;
    max-height: 160px;
    outline: none;
    font-family: inherit;
}

.chat-input-textarea::placeholder {
    color: var(--ai-text-muted);
}

.btn-chat-send {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--ai-accent);
    color: #ffffff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 16px;
    flex-shrink: 0;
    transition: background 0.15s, transform 0.1s;
    margin-bottom: 2px;
}

.btn-chat-send:hover:not(:disabled) {
    background: var(--ai-accent-hover);
    transform: scale(1.05);
}

.btn-chat-send:disabled {
    background: var(--ai-border);
    color: var(--ai-text-muted);
    cursor: not-allowed;
    transform: none;
}

.btn-chat-send.btn-stop-stream {
    background: #ef4444 !important;
}

.input-disclaimer {
    max-width: 860px;
    margin: 8px auto 0 auto;
    text-align: center;
    font-size: 11px;
    color: var(--ai-text-muted);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .ai-sidebar {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        z-index: 200;
        box-shadow: 2px 0 20px rgba(0, 0, 0, 0.4);
    }
    
    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 150;
        backdrop-filter: blur(2px);
    }
    
    .starter-cards-grid {
        grid-template-columns: 1fr;
    }
}