@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
    --bg-primary: #fbfaf7;
    --bg-secondary: #f4f3ee;
    --bg-tertiary: #ffffff;
    
    --border-color: #e5e5df;
    --border-light: #ecebe4;
    
    --text-primary: #191916;
    --text-secondary: #565651;
    --text-muted: #8c8c87;
    
    --accent-primary: rgb(57, 89, 49);
    --accent-hover: rgb(41, 64, 35);
    --accent-primary-rgb: 57, 89, 49;
    
    --bubble-user-bg: #e2dfd5;
    
    --accent-feedback: #d97706;  /* Contrast amber for annotations */
    
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.08);
    --input-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    
    --font-heading: 'Playfair Display', 'Georgia', serif;
    --font-body: 'Open Sans', sans-serif;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    
    --sidebar-width: 260px;
    --max-chat-width: 800px;
}

/* Explicit Light Mode Override */
.theme-light {
    --bg-primary: #fbfaf7;
    --bg-secondary: #f4f3ee;
    --bg-tertiary: #ffffff;
    --border-color: #e5e5df;
    --border-light: #ecebe4;
    --text-primary: #191916;
    --text-secondary: #565651;
    --text-muted: #8c8c87;
    --accent-primary: rgb(57, 89, 49);
    --accent-hover: rgb(41, 64, 35);
    --accent-primary-rgb: 57, 89, 49;
    --bubble-user-bg: #e2dfd5;
}

/* Explicit Dark Mode Override */
.theme-dark {
    --bg-primary: #191916;
    --bg-secondary: #22221e;
    --bg-tertiary: #1c1c18;
    --border-color: #2e2e2a;
    --border-light: #3a3a35;
    --text-primary: #f3f3ee;
    --text-secondary: #a5a5a0;
    --text-muted: #787873;
    --accent-primary: #5c7e45;
    --accent-hover: #3d562c;
    --accent-primary-rgb: 92, 126, 69;
    --bubble-user-bg: #2d2d28;
}

@media (prefers-color-scheme: dark) {
    :root:not(.theme-light) {
        --bg-primary: #191916;
        --bg-secondary: #22221e;
        --bg-tertiary: #1c1c18;
        --border-color: #2e2e2a;
        --border-light: #3a3a35;
        --text-primary: #f3f3ee;
        --text-secondary: #a5a5a0;
        --text-muted: #787873;
        --accent-primary: #5c7e45;
        --accent-hover: #3d562c;
        --accent-primary-rgb: 92, 126, 69;
        --bubble-user-bg: #2d2d28;
    }
}

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

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    height: 100%;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    width: 100%;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.brand-logo {
    width: 90%;
    height: auto;
    display: block;
}

.new-chat-btn {
    margin: 16px;
    padding: 11px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 20px;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--card-shadow);
}

.new-chat-btn:hover {
    border-color: var(--accent-primary);
    background-color: rgba(var(--accent-primary-rgb), 0.05);
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 10px 16px 10px;
}

.chat-item {
    padding: 12px 14px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: all var(--transition-fast);
    margin-bottom: 4px;
}

.chat-item .chat-title {
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.chat-item .chat-date {
    font-size: 11px;
    color: var(--text-muted);
}

.chat-item:hover {
    background-color: rgba(var(--accent-primary-rgb), 0.05);
    color: var(--text-primary);
}

.chat-item.active {
    background-color: rgba(var(--accent-primary-rgb), 0.12);
    color: var(--accent-primary);
    font-weight: 500;
}

/* Main Layout */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    background-color: var(--bg-primary);
}

.chat-header {
    height: 60px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    padding: 0 32px;
    z-index: 10;
}

.header-title {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-primary);
}

/* Messages container */
.messages-container {
    position: relative;
    flex: 1;
    overflow-y: auto;
    padding: 32px 32px 140px 32px;
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 80%;
    max-width: 600px;
    margin: auto;
    text-align: center;
    gap: 16px;
}

.welcome-screen h1 {
    font-family: var(--font-heading);
    font-size: 36px;
    font-weight: 700;
}

.welcome-screen p {
    color: var(--text-secondary);
    font-size: 16px;
}

.message-row {
    display: flex;
    width: 100%;
    max-width: var(--max-chat-width);
    margin: 0 auto;
}

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

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

.message-bubble {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
}

.message-row.user .message-bubble {
    background-color: var(--bubble-user-bg);
    padding: 14px 20px;
    border-radius: 20px;
    border-top-right-radius: 4px;
    max-width: 75%;
    box-shadow: var(--card-shadow);
}

.message-row.assistant .message-bubble {
    width: 100%;
    background-color: transparent;
    padding: 0;
}

/* Loading state animation */
.loading-row .message-bubble {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
}

.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(var(--accent-primary-rgb), 0.2);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    flex-shrink: 0;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.message-bubble p {
    margin-bottom: 14px;
}
.message-bubble p:last-child {
    margin-bottom: 0;
}

/* Reasoning toggle (subtle "View reasoning" text, collapsed <details>) */
.reasoning-panel {
    margin-bottom: 14px;
}
.reasoning-summary {
    cursor: pointer;
    font-size: 13px;
    color: var(--text-muted);
    list-style: none;
    user-select: none;
    display: inline-block;
}
.reasoning-summary::-webkit-details-marker {
    display: none;
}
.reasoning-summary::before {
    content: "\25B8";
    display: inline-block;
    margin-right: 6px;
    transition: transform var(--transition-fast);
}
.reasoning-panel[open] .reasoning-summary::before {
    transform: rotate(90deg);
}
.reasoning-summary:hover {
    color: var(--text-secondary);
}
.reasoning-body {
    margin-top: 8px;
    padding-left: 14px;
    border-left: 2px solid var(--border-light);
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}
.reasoning-body p:last-child {
    margin-bottom: 0;
}

/* Input Card */
.input-container {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 24px 32px 32px 32px;
    background: linear-gradient(to top, var(--bg-primary) 70%, rgba(249, 248, 246, 0) 100%);
    z-index: 100;
}

.input-box-wrapper {
    max-width: var(--max-chat-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 10px 18px;
    box-shadow: var(--input-shadow);
}

.input-box-wrapper:focus-within {
    border-color: var(--accent-primary);
}

.chat-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    resize: none;
    height: 24px;
    outline: none;
    line-height: 24px;
}

.send-message-btn {
    background: none;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}
.send-message-btn:hover {
    background-color: var(--bg-secondary);
}

/* Composer options button + popup menu (outside the input pill) */
.composer-options {
    position: relative;
}
.composer-options-btn {
    background: none;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}
.composer-options-btn:hover {
    background-color: var(--bg-secondary);
}
.composer-options-menu {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
    padding: 12px;
    min-width: 220px;
    z-index: 200;
}
.composer-menu-section {
    margin-bottom: 4px;
}
.composer-menu-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.composer-menu-options {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.composer-menu-option {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 5px 10px;
    border-radius: 16px;
    font-family: var(--font-body);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.composer-menu-option:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}
.composer-menu-option.active {
    background-color: rgba(var(--accent-primary-rgb), 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    font-weight: 600;
}

/* Sources */
.sources-container {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.sources-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 10px;
}

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

.source-tag {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--accent-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

/* Ratings & Feedback Buttons */
.feedback-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
}

.feedback-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.feedback-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

.feedback-btn.active {
    color: var(--accent-primary);
    background-color: rgba(var(--accent-primary-rgb), 0.1);
}

.feedback-btn.active.down {
    color: #b91c1c;
    background-color: rgba(185, 28, 28, 0.1);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(25, 25, 22, 0.4);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 520px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: modal-appear var(--transition-normal);
}

@keyframes modal-appear {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-family: var(--font-body);
    font-size: 18px;
    font-weight: 700;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    margin: 0;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    outline: none;
}

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

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Category Buttons */
.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
    margin-bottom: 16px;
}

.category-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 20px;
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.category-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.category-btn.active {
    background-color: rgba(var(--accent-primary-rgb), 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    font-weight: 600;
}

/* Modal Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 20px;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
    border: none;
}

.btn-primary {
    background-color: rgba(var(--accent-primary-rgb), 0.08);
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    font-weight: 600;
}

.btn-primary:hover {
    background-color: rgba(var(--accent-primary-rgb), 0.15);
    border-color: var(--accent-hover);
    color: var(--accent-hover);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    border: 1px solid transparent;
    color: var(--text-secondary);
}

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

/* Form Groups */
.modal-form-group {
    margin-bottom: 16px;
    text-align: left;
}

.modal-form-group label {
    display: block;
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.modal-form-group textarea {
    width: 100%;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
    transition: border-color var(--transition-fast);
}

.modal-form-group textarea:focus {
    border-color: var(--accent-primary);
}

/* Text selections & Highlight flags */
.highlighted-flagged {
    border-bottom: 2px dotted var(--accent-feedback);
    background-color: rgba(217, 119, 6, 0.09);
    cursor: help;
    position: relative;
    padding: 2px 0;
    border-radius: 2px;
}

.highlighted-flagged:hover {
    background-color: rgba(217, 119, 6, 0.18);
}

.highlight-tooltip {
    display: none;
    position: absolute;
    bottom: 130%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    width: 250px;
    color: var(--text-primary);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    z-index: 100;
}

.highlight-tooltip strong {
    display: block;
    color: var(--accent-primary);
    margin-bottom: 6px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: var(--font-body);
}

.highlighted-flagged:hover .highlight-tooltip {
    display: block;
}

.selected-text-preview {
    font-family: var(--font-heading);
    font-style: italic;
    color: var(--text-secondary);
    padding: 14px;
    background-color: var(--bg-primary);
    border-left: 3px solid var(--accent-primary);
    border-radius: 6px;
    margin-bottom: 18px;
    line-height: 1.6;
}

/* Floating highlighted triggers */
.floating-highlight-trigger {
    position: absolute;
    display: none;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    z-index: 999;
    align-items: center;
    gap: 8px;
    transform: translate(-50%, -100%);
    margin-top: -8px;
}

/* Sidebar Footer & Theme selector styling */
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.01);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.user-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
}

.user-actions .nav-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.user-actions .nav-link:hover {
    color: var(--text-primary);
}

.theme-selector-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
}

.theme-dropdown {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 6px;
    outline: none;
    cursor: pointer;
}

/* Source inspection popup */
.source-chunk-text {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 18px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    max-height: 250px;
    overflow-y: auto;
    white-space: pre-wrap;
}

#source-modal .modal-card {
    max-width: 800px;
    width: 90%;
}

#source-modal .source-chunk-text {
    max-height: 480px;
    font-size: 14px;
    line-height: 1.6;
}

/* Login Screen Styles */
body.login-body {
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.04);
    text-align: center;
    box-sizing: border-box;
    animation: card-entry 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes card-entry {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-badge {
    display: inline-block;
    background-color: rgba(57, 89, 49, 0.1);
    color: var(--accent-primary);
    font-size: 11px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 30px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

@media (prefers-color-scheme: dark) {
    .login-badge {
        background-color: rgba(92, 126, 69, 0.15);
    }
}

.login-card h1 {
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 700;
    margin: 0 0 8px 0;
}

.login-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
    margin: 0 0 30px 0;
}

.login-input-group {
    text-align: left;
    margin-bottom: 24px;
}

.login-input-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.login-input-group input {
    width: 100%;
    padding: 12px 16px;
    border-radius: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.login-input-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(92, 126, 69, 0.15);
}

.login-card button {
    background-color: var(--accent-primary);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    padding: 14px;
    width: 100%;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.login-card button:hover {
    background-color: var(--accent-hover);
}

.login-card button:active {
    transform: scale(0.98);
}