/* 
 * Alfa-Bank AI Assistant - Styles
 * Modern dark theme with glassmorphism effects
 */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #EF3124;
    --color-primary-light: #FF5147;
    --color-primary-dark: #C42519;
    
    --color-bg-primary: #0D0D0D;
    --color-bg-secondary: #1A1A1A;
    --color-bg-tertiary: #252525;
    --color-bg-elevated: #2D2D2D;
    
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #A0A0A0;
    --color-text-muted: #6B6B6B;
    
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-subtle: rgba(255, 255, 255, 0.05);
    
    /* Glass effect */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* 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);
    
    /* 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-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 15px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
}

/* Light Theme */
[data-theme="light"] {
    --color-bg-primary: #F5F5F5;
    --color-bg-secondary: #FFFFFF;
    --color-bg-tertiary: #ECECEC;
    --color-bg-elevated: #FFFFFF;
    
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #6B6B6B;
    --color-text-muted: #A0A0A0;
    
    --color-border: rgba(0, 0, 0, 0.1);
    --color-border-subtle: rgba(0, 0, 0, 0.05);
    
    --glass-bg: rgba(0, 0, 0, 0.02);
    --glass-border: rgba(0, 0, 0, 0.06);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    min-height: 100vh;
    overflow: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100%;
    margin: 0 auto;
}

/* Header */
.header {
    flex-shrink: 0;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    backdrop-filter: blur(20px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 900px;
    margin: 0 auto;
}

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

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: white;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.messages {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Messages */
.message {
    display: flex;
    gap: var(--spacing-md);
    animation: messageSlideIn var(--transition-normal) ease-out;
}

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

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

.message-avatar {
    flex-shrink: 0;
}

.avatar-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
}

.message.user .avatar-icon {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
}

.message-content {
    flex: 1;
    max-width: 80%;
}

.message.user .message-content {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.message-text {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.message.user .message-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-color: transparent;
    color: white;
}

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

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

.message-text ul, .message-text ol {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.message-text li {
    margin-bottom: var(--spacing-xs);
}

.message-text code {
    background: var(--glass-bg);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: var(--font-size-sm);
}

.message-text h1, .message-text h2, .message-text h3, .message-text h4 {
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
    font-weight: 600;
    line-height: var(--line-height-tight);
}

.message-text h1:first-child, .message-text h2:first-child,
.message-text h3:first-child, .message-text h4:first-child {
    margin-top: 0;
}

.message-text h1 {
    font-size: 1.4em;
    color: var(--color-primary);
}

.message-text h2 {
    font-size: 1.25em;
    color: var(--color-primary);
}

.message-text h3 {
    font-size: 1.1em;
    color: var(--color-text-primary);
}

.message-text h4 {
    font-size: 1em;
    color: var(--color-text-secondary);
}

/* Sources */
.message-sources {
    margin-top: var(--spacing-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.source-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.source-tag:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: translateY(-1px);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md);
}

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

.typing-indicator span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes typingBounce {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Input Container */
.input-container {
    flex-shrink: 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
}

.input-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.chat-form {
    width: 100%;
}

.input-group {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-group:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(239, 49, 36, 0.1);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    padding: var(--spacing-sm) var(--spacing-md);
    resize: none;
    max-height: 150px;
    overflow-y: auto;
}

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

.send-btn {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.input-hint {
    margin-top: var(--spacing-sm);
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .messages {
        padding: var(--spacing-md);
    }
    
    .message-content {
        max-width: 90%;
    }
    
    .input-container {
        padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
    }
}

/* Error state */
.message.error .message-text {
    background: rgba(239, 49, 36, 0.1);
    border-color: var(--color-primary);
}

/* Empty state */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
    text-align: center;
}

.empty-state-icon {
    font-size: 48px;
    opacity: 0.5;
}