/* Apple-inspired CSS with Inter font (similar to SF Pro) */
:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fbfbfd;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #a1a1a6;
    --accent-blue: #007aff;
    --accent-blue-hover: #0056cc;
    --border-light: #d2d2d7;
    --border-medium: #86868b;
    --shadow-light: rgba(0, 0, 0, 0.04);
    --shadow-medium: rgba(0, 0, 0, 0.08);
    --shadow-heavy: rgba(0, 0, 0, 0.16);
    
    /* Spacing scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    
    /* Typography */
    --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-medium: 250ms ease-out;
    --transition-slow: 350ms ease-out;
}

/* Dark theme */
[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1c1c1e;
    --bg-tertiary: #2c2c2e;
    --text-primary: #ffffff;
    --text-secondary: #ebebf5;
    --text-tertiary: #ebebf599;
    --accent-blue: #0a84ff;
    --accent-blue-hover: #409cff;
    --border-light: #38383a;
    --border-medium: #48484a;
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-medium: rgba(0, 0, 0, 0.3);
    --shadow-heavy: rgba(0, 0, 0, 0.5);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
    max-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-medium);
    z-index: 10;
}

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

.sidebar-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.prompt-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.prompt-item {
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    position: relative;
}

.prompt-item:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-light);
}

.prompt-item.active {
    background-color: var(--accent-blue);
    color: white;
}

.prompt-item .prompt-name {
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.prompt-item .prompt-preview {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.prompt-item.active .prompt-preview {
    color: rgba(255, 255, 255, 0.8);
}

.prompt-actions {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    display: flex;
    gap: var(--space-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.prompt-item:hover .prompt-actions {
    opacity: 1;
}

.sidebar-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--border-light);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    min-width: 0;
}

.chat-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-primary);
}

.header-info h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.model-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background-color: #34c759;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.prompt-selector {
    min-width: 200px;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.prompt-selector:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
    scroll-behavior: smooth;
}

.welcome-message {
    text-align: center;
    padding: var(--space-2xl);
    max-width: 400px;
    margin: 0 auto;
}

.welcome-icon {
    margin-bottom: var(--space-lg);
    color: var(--accent-blue);
}

.welcome-message h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.welcome-message p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Message Bubbles */
.message {
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    max-width: 800px;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), #5856d6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #34c759, #30d158);
}

.message-content {
    background-color: var(--bg-secondary);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    max-width: 100%;
    word-wrap: break-word;
    position: relative;
}

.message.user .message-content {
    background-color: var(--accent-blue);
    color: white;
}

.message-text {
    line-height: 1.5;
}

.message-time {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-sm);
}

.message.user .message-time {
    color: rgba(255, 255, 255, 0.7);
}

/* Loading indicator */
.message.loading .message-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-height: 40px;
}

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

.typing-dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

/* Input Area */
.chat-input-container {
    padding: var(--space-lg);
    border-top: 1px solid var(--border-light);
    background-color: var(--bg-primary);
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.chat-input-wrapper:focus-within {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

#messageInput {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    outline: none;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--text-primary);
    line-height: 1.4;
    max-height: 120px;
    min-height: 20px;
}

#messageInput::placeholder {
    color: var(--text-tertiary);
}

.send-button {
    width: 36px;
    height: 36px;
    border: none;
    background-color: var(--accent-blue);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    background-color: var(--accent-blue-hover);
    transform: scale(1.05);
}

.send-button:disabled {
    background-color: var(--text-tertiary);
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--space-sm);
}

.char-count {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Buttons */
.btn-primary {
    background-color: var(--accent-blue);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    justify-content: center;
}

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-medium);
}

.btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    background-color: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px var(--shadow-heavy);
    width: 90%;
    max-width: 500px;
    max-height: 85vh;
    overflow: hidden;
    animation: modalSlideIn var(--transition-medium);
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-body {
    padding: var(--space-lg);
    flex: 1;
    overflow: hidden;
}

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

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Animations */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes typing {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        transform: translateX(-100%);
        z-index: 100;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .chat-header {
        padding: var(--space-md);
    }
    
    .header-controls {
        flex-direction: column;
        align-items: flex-end;
        gap: var(--space-sm);
    }
    
    .prompt-selector {
        min-width: 150px;
    }
    
    .message {
        max-width: 90%;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-medium);
}

/* Streaming cursor animation */
.streaming-cursor {
    animation: blink 1s infinite;
    color: var(--accent-blue);
    font-weight: bold;
    margin-left: 2px;
}

.message.streaming .message-content {
    position: relative;
}

.message.streaming .message-text {
    min-height: 20px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Smooth text appearance for streaming */
.message.streaming .message-text {
    word-wrap: break-word;
    white-space: pre-wrap;
}

/* System Prompt Management Modal */
.large-modal {
    width: 95%;
    max-width: 900px;
    max-height: 85vh;
}

.prompt-management-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    height: 100%;
    overflow: hidden;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-light);
}

.section-header h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.prompt-list-section {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.prompt-management-list {
    flex: 1;
    overflow: hidden;
}

.prompt-management-item {
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.prompt-management-item:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 2px 8px var(--shadow-light);
}

.prompt-management-item.selected {
    border-color: var(--accent-blue);
    background-color: rgba(0, 122, 255, 0.05);
}

.prompt-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
}

.prompt-item-name {
    font-weight: 600;
    color: var(--text-primary);
}

.prompt-item-actions {
    display: flex;
    gap: var(--space-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.prompt-management-item:hover .prompt-item-actions {
    opacity: 1;
}

.prompt-item-preview {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.prompt-editor {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.prompt-editor-section {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.editor-actions {
    display: flex;
    gap: var(--space-md);
}

.textarea-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--space-sm);
}

/* Header improvements */
.header-controls {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.manage-prompts-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    white-space: nowrap;
}

.prompt-selector {
    min-width: 180px;
}

/* Speed indicator */
.speed-indicator {
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    margin-left: var(--space-sm);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.speed-indicator.visible {
    opacity: 1;
}

.speed-indicator.fast {
    color: #34c759;
}

.speed-indicator.medium {
    color: #ff9500;
}

.speed-indicator.slow {
    color: #ff3b30;
}

/* Responsive improvements */
@media (max-width: 768px) {
    .prompt-management-container {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .large-modal {
        width: 98%;
        max-height: 90vh;
    }
    
    .header-controls {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-sm);
    }
    
    .prompt-selector {
        min-width: auto;
        width: 100%;
    }
    
    .manage-prompts-btn {
        justify-content: center;
    }
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-secondary);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}

.empty-state h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

.empty-state p {
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

/* Chat Sidebar Styles */
.sidebar {
    width: 260px;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-medium);
    position: relative;
}

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

.sidebar-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.chat-item {
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    position: relative;
}

.chat-item:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-light);
}

.chat-item.active {
    background-color: var(--accent-blue);
    color: white;
}

.chat-item-title {
    font-weight: 500;
    margin-bottom: var(--space-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-item-preview {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-item.active .chat-item-preview {
    color: rgba(255, 255, 255, 0.8);
}

.chat-item-actions {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    display: flex;
    gap: var(--space-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

/* Header improvements for sidebar layout */
.header-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-title {
    display: flex;
    flex-direction: column;
}

.sidebar-toggle {
    display: none;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        transform: translateX(-100%);
        z-index: 100;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: flex !important;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .header-info {
        flex-direction: row;
        align-items: center;
    }
    
    .header-title h1 {
        font-size: var(--font-size-lg);
    }
    
    .model-info {
        font-size: var(--font-size-xs);
    }
}

/* Empty chat state */
.empty-chat-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-secondary);
}

.empty-chat-state svg {
    width: 48px;
    height: 48px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}