/**
 * MAXI Styles
 * Mobile-first, minimal, professional design
 * Light theme with dark mode support
 * No shadows, rounded corners
 */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --accent-primary: #2563eb;
    --accent-secondary: #3b82f6;
    --accent-light: #dbeafe;
    --border-color: #e5e7eb;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --user-bubble: #2563eb;
    --user-text: #ffffff;
    --assistant-bubble: #f1f5f9;
    --assistant-text: #1e293b;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark Theme */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-primary: #3b82f6;
    --accent-secondary: #60a5fa;
    --accent-light: #1e3a5f;
    --border-color: #334155;
    --user-bubble: #3b82f6;
    --user-text: #ffffff;
    --assistant-bubble: #1e293b;
    --assistant-text: #e2e8f0;
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   SVG ICONS
   ============================================ */
.icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: none;
    flex-shrink: 0;
}

.icon-btn .icon {
    width: 20px;
    height: 20px;
}

#send-btn .icon {
    width: 18px;
    height: 18px;
}

.settings-item .icon {
    width: 18px;
    height: 18px;
}

.message-avatar .icon {
    width: 20px;
    height: 20px;
}

/* ============================================
   LOGIN SCREEN
   ============================================ */
#login-screen {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
}

.login-container {
    width: 100%;
    max-width: 360px;
    text-align: center;
}

.login-logo {
    width: 180px;
    height: auto;
    margin-bottom: var(--spacing-lg);
}

/* Invert logo for light mode (since logo is white) */
body:not(.dark-mode) .login-logo {
    filter: invert(1);
}

.login-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.input-group {
    position: relative;
}

.input-group input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
    outline: none;
}

.input-group input:focus {
    border-color: var(--accent-primary);
}

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

.login-btn {
    padding: var(--spacing-md);
    font-size: var(--font-size-md);
    font-weight: 600;
    color: white;
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

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

.login-error {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--radius-sm);
}

/* ============================================
   CHAT INTERFACE
   ============================================ */
#chat-interface {
    height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

/* Header */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.header-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

body:not(.dark-mode) .header-logo {
    filter: invert(1);
}

.header-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.header-subtitle {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

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

.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.icon-btn.active {
    background: var(--accent-light);
    color: var(--accent-primary);
}

/* Voice Status Bar */
.voice-status-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

#listening-indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--text-muted);
    transition: all var(--transition-fast);
}

#listening-indicator.active {
    background: var(--success);
    animation: pulse 1.5s ease-in-out infinite;
}

#listening-indicator.speaking {
    background: var(--accent-primary);
    animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
}

.voice-status {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.voice-status.listening {
    color: var(--text-muted);
}

.voice-status.active {
    color: var(--success);
    font-weight: 600;
}

.voice-status.speaking {
    color: var(--accent-primary);
}

.voice-status.processing {
    color: var(--warning);
}

#transcript-display {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-style: italic;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Sync Indicator */
.sync-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    opacity: 0;
}

.sync-indicator.synced {
    opacity: 1;
    color: var(--success);
    background: rgba(52, 211, 153, 0.1);
}

.sync-indicator.error {
    opacity: 1;
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.sync-indicator.syncing {
    opacity: 1;
    color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.sync-indicator.syncing .icon-sm {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.sync-indicator .icon-sm {
    width: 12px;
    height: 12px;
}

/* Chat Messages Container */
.chat-messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
}

#chat-messages {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

/* Message Styles */
.message {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.message.assistant-message {
    align-self: flex-start;
}

.message.system-message {
    align-self: center;
    max-width: 100%;
}

.message-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.message-content {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    line-height: 1.5;
    word-wrap: break-word;
}

.user-message .message-content {
    background: var(--user-bubble);
    color: var(--user-text);
    border-bottom-right-radius: var(--radius-sm);
}

.assistant-message .message-content {
    background: var(--assistant-bubble);
    color: var(--assistant-text);
    border-bottom-left-radius: var(--radius-sm);
}

.system-message .message-content {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-align: center;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
}

.message-time {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    align-self: flex-end;
}

/* Typing Indicator */
.message.typing .message-content {
    padding: var(--spacing-md);
}

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

.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: var(--radius-full);
    animation: bounce 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }
.typing-dots span:nth-child(3) { animation-delay: 0s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

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

.chat-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

#message-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-md);
    font-family: inherit;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    resize: none;
    min-height: 24px;
    max-height: 120px;
}

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

/* Attach Button */
.icon-btn-input {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

.icon-btn-input .icon {
    width: 20px;
    height: 20px;
}

/* File Preview */
.file-preview {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.file-preview-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.file-preview-content .icon {
    width: 16px;
    height: 16px;
    color: var(--accent-primary);
}

#file-preview-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.icon-btn-sm {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    color: var(--text-muted);
}

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

.icon-btn-sm .icon {
    width: 14px;
    height: 14px;
}

/* Input Hint */
.input-hint {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 10px;
    color: var(--text-muted);
    text-align: center;
}

#send-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

#send-btn:hover {
    background: var(--accent-secondary);
}

#send-btn:active {
    transform: scale(0.95);
}

/* Settings Panel */
#settings-panel {
    position: absolute;
    top: 60px;
    right: var(--spacing-md);
    width: 280px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    z-index: 200;
    overflow: hidden;
}

.settings-header {
    padding: var(--spacing-md);
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
}

.settings-body {
    padding: var(--spacing-sm);
}

.settings-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    width: 100%;
    text-align: left;
    transition: background-color var(--transition-fast);
}

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

.settings-item.danger {
    color: var(--danger);
}

.settings-hint {
    font-size: 10px;
    color: var(--text-muted);
    padding: 0 var(--spacing-md) var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   RESPONSIVE STYLES
   ============================================ */
/* Tablets and up */
@media (min-width: 768px) {
    .login-container {
        padding: var(--spacing-xl);
        background: var(--bg-primary);
        border-radius: var(--radius-lg);
        border: 1px solid var(--border-color);
    }
    
    .chat-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .chat-messages-container {
        padding: var(--spacing-lg);
    }
    
    .chat-input-container {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .message {
        max-width: 70%;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .chat-messages-container {
        padding: var(--spacing-xl);
    }
    
    .message {
        max-width: 60%;
    }
}

/* ============================================
   SCROLLBAR STYLES
   ============================================ */
.chat-messages-container::-webkit-scrollbar {
    width: 6px;
}

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

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

.chat-messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================
   SAFE AREA INSETS (for notched devices)
   ============================================ */
@supports (padding: env(safe-area-inset-bottom)) {
    .chat-input-container {
        padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .chat-header,
    .voice-status-bar,
    .chat-input-container,
    #settings-panel {
        display: none !important;
    }
    
    .chat-messages-container {
        overflow: visible;
    }
}