/* ===================================
   CSS CUSTOM PROPERTIES (ChatGPT-Style Theme)
   =================================== */
:root {
    /* Colors - Dark theme with green accents */
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #202020;
    --bg-hover: #2a2a2a;
    --bg-active: #333333;

    --border-color: #333333;
    --border-light: #404040;

    --text-primary: #ffffff;
    --text-secondary: #b4b4b4;
    --text-muted: #6b6b6b;

    --accent-green: #10a37f;
    --accent-green-light: #1ed49d;
    --accent-green-dark: #0d8a6a;
    --accent-green-glow: rgba(16, 163, 127, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

    /* Sidebar width */
    --sidebar-width: 280px;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
    height: 100vh;
}

/* ===================================
   APP LAYOUT
   =================================== */
.app-wrapper {
    display: flex;
    height: 100vh;
    background: var(--bg-primary);
}

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

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

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.sidebar-logo {
    width: 32px;
    height: 32px;
    background: var(--accent-green);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-logo svg {
    width: 20px;
    height: 20px;
    color: white;
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-settings {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.sidebar-settings:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Search Box */
.search-box {
    position: relative;
}

.search-input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    padding-left: 2.5rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
    transition: all 0.2s ease;
}

.search-input:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px var(--accent-green-glow);
}

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

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

/* Sidebar Content */
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.sidebar-content::-webkit-scrollbar {
    width: 4px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

/* Sidebar Sections */
.sidebar-section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-sm);
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.section-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.section-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

/* Folder Items */
.folder-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: var(--spacing-xs);
}

.folder-item:hover {
    background: var(--bg-hover);
}

.folder-item.active {
    background: var(--bg-active);
}

.folder-icon {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
}

.folder-name {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.folder-menu {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.2s ease;
}

.folder-item:hover .folder-menu {
    opacity: 1;
}

.folder-menu:hover {
    background: var(--bg-active);
    color: var(--text-primary);
}

/* Chat Items */
.chat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: var(--spacing-xs);
}

.chat-item:hover {
    background: var(--bg-hover);
}

.chat-item.active {
    background: var(--bg-active);
}

.chat-icon {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-info {
    flex: 1;
    min-width: 0;
}

.chat-name {
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.chat-preview {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-menu {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.2s ease;
}

.chat-item:hover .chat-menu {
    opacity: 1;
}

.chat-menu:hover {
    background: var(--bg-active);
    color: var(--text-primary);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--accent-green);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.new-chat-btn svg {
    width: 18px;
    height: 18px;
}

/* ===================================
   MAIN CONTENT AREA
   =================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--bg-primary);
}

/* Main Header */
.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.back-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

.chat-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.version-badge {
    background: var(--accent-green);
    color: white;
    font-size: 0.625rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.welcome-logo {
    width: 48px;
    height: 48px;
    background: var(--accent-green);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.welcome-logo svg {
    width: 28px;
    height: 28px;
    color: white;
}

.welcome-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.welcome-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 500px;
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

/* Feature Cards */
.feature-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    width: 100%;
    max-width: 700px;
    margin-bottom: var(--spacing-2xl);
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--accent-green);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--accent-green);
}

.feature-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Category Tabs */
.category-tabs {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.category-tab {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.875rem;
    padding: var(--spacing-sm) var(--spacing-lg);
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: all 0.2s ease;
}

.category-tab:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.category-tab.active {
    color: var(--accent-green);
    background: rgba(16, 163, 127, 0.1);
}

/* Chat Messages Area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: none;
}

.chat-messages.active {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

/* Messages */
.message {
    display: flex;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
    object-fit: contain;
}

.user-message {
    flex-direction: row-reverse;
}

.user-message .message-avatar {
    background: var(--accent-green);
    color: white;
}

.assistant-message .message-avatar {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.message-content {
    flex: 1;
    max-width: calc(100% - 50px);
}

.message-text {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    line-height: 1.6;
}

.user-message .message-text {
    background: var(--accent-green);
    color: white;
    border-bottom-right-radius: var(--radius-sm);
}

.assistant-message .message-text {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
}

.message-text p {
    margin-bottom: var(--spacing-sm);
}

.message-text p:last-child {
    margin-bottom: 0;
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.typing-dots {
    display: flex;
    gap: 4px;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    animation: typing 1.4s infinite;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {

    0%,
    60%,
    100% {
        transform: translateY(0);
        opacity: 0.5;
    }

    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

.loading-text {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===================================
   INPUT AREA
   =================================== */
.input-container {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--bg-primary);
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.chat-input-box {
    display: flex;
    align-items: flex-end;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    transition: all 0.2s ease;
}

.chat-input-box:focus-within {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px var(--accent-green-glow);
}

.input-left {
    display: flex;
    align-items: center;
    padding-left: var(--spacing-sm);
}

.input-logo {
    width: 24px;
    height: 24px;
    color: var(--accent-green);
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    padding: var(--spacing-sm) var(--spacing-md);
    resize: none;
    max-height: 120px;
    outline: none;
}

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

.input-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.input-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

.send-btn {
    background: var(--accent-green);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
}

.send-btn:hover {
    background: var(--accent-green-light);
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.llm-counter {
    font-size: 0.75rem;
    color: var(--accent-green);
    font-weight: 500;
}

/* ===================================
   MODALS
   =================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    max-width: 480px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    transition: color 0.2s ease;
}

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

.modal-body {
    padding: var(--spacing-xl);
    max-height: 60vh;
    overflow-y: auto;
}

.modal-body p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.modal-input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.modal-input:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px var(--accent-green-glow);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

.btn-primary {
    background: var(--accent-green);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background: var(--accent-green-light);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

/* Rule Display Modal */
.rule-display {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 400px;
    overflow-y: auto;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        height: 100%;
        z-index: 100;
        transition: left 0.3s ease;
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        display: none;
    }

    .sidebar-overlay.show {
        display: block;
    }

    .feature-cards {
        grid-template-columns: 1fr;
    }

    .category-tabs {
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .feature-cards {
        grid-template-columns: 1fr;
    }

    .welcome-title {
        font-size: 1.5rem;
    }

    .modal-content {
        width: 95%;
        margin: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .input-container {
        padding: var(--spacing-md);
    }

    .chat-input-box {
        padding: var(--spacing-sm);
    }

    .welcome-screen {
        padding: var(--spacing-lg);
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.hidden {
    display: none !important;
}

.no-scroll {
    overflow: hidden;
}

/* Session ID display */
.session-info {
    font-size: 0.75rem;
    color: var(--text-muted);
}