:root {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --dark: #0f172a;
    --darker: #020617;
    --light: #f8fafc;
    --gray: #64748b;
    --gray-light: #cbd5e1;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --sidebar-width: 380px;
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --code-bg: #1a1b26;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 50%, #1e1b4b 100%);
    color: var(--light);
    min-height: 100vh;
    line-height: 1.6;
    overflow: hidden;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--darker);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 20px;
}

.loading-progress {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% { width: 0%; transform: translateX(-100%); }
    50% { width: 100%; }
    100% { width: 0%; transform: translateX(100%); }
}

/* Main Container - IMPROVED SCALING */
.container {
    width: 100%;
    height: 100vh;
    margin: 0 auto;
    padding: min(2vw, 24px);
    display: flex;
    flex-direction: column;
}

/* Header - BETTER SCALING */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: min(2vw, 24px);
    padding: 0 min(1vw, 8px);
    flex-shrink: 0;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.5vw, 16px);
}

.logo {
    width: clamp(36px, 4vw, 48px);
    height: clamp(36px, 4vw, 48px);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(18px, 2vw, 24px);
}

.logo-text {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 700;
    background: linear-gradient(135deg, var(--light), var(--gray-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: clamp(8px, 1vw, 12px);
}

.header-btn {
    padding: clamp(8px, 1vw, 10px) clamp(16px, 2vw, 20px);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    color: var(--light);
    font-size: clamp(12px, 1.2vw, 14px);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: clamp(6px, 0.8vw, 8px);
    white-space: nowrap;
}

.header-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.header-btn.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
}

/* Main Content - IMPROVED RESPONSIVE LAYOUT */
.main-content {
    display: grid;
    grid-template-columns: clamp(280px, 25vw, 380px) 1fr;
    gap: clamp(16px, 2vw, 24px);
    flex: 1;
    min-height: 0;
    height: calc(100vh - 120px);
}

/* Sidebar */
.sidebar {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: clamp(16px, 2vw, 24px);
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
}

.sidebar-header {
    margin-bottom: clamp(16px, 2vw, 24px);
    flex-shrink: 0;
}

.sidebar-title {
    font-size: clamp(16px, 1.8vw, 20px);
    font-weight: 600;
    margin-bottom: clamp(4px, 0.5vw, 8px);
}

.sidebar-subtitle {
    color: var(--gray);
    font-size: clamp(12px, 1.2vw, 14px);
}

.model-search {
    margin-bottom: clamp(16px, 2vw, 20px);
    flex-shrink: 0;
}

.search-container {
    position: relative;
}

.search-input {
    width: 100%;
    padding: clamp(10px, 1.2vw, 12px) clamp(12px, 1.6vw, 16px) clamp(10px, 1.2vw, 12px) 44px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    color: var(--light);
    font-size: clamp(13px, 1.2vw, 14px);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

.model-categories {
    display: flex;
    gap: clamp(6px, 0.8vw, 8px);
    margin-bottom: clamp(16px, 2vw, 20px);
    flex-wrap: wrap;
    flex-shrink: 0;
}

.category-btn {
    padding: clamp(6px, 0.8vw, 8px) clamp(12px, 1.6vw, 16px);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    color: var(--gray);
    font-size: clamp(11px, 1vw, 12px);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.category-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--light);
}

.category-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-color: transparent;
}

/* Models Container - Scrollable */
.models-container {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

.models-container::-webkit-scrollbar {
    width: 6px;
}

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

.models-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.model-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: clamp(12px, 1.4vw, 16px);
    margin-bottom: clamp(8px, 1vw, 12px);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.model-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(4px);
    border-color: rgba(255, 255, 255, 0.2);
}

.model-card.active {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(14, 165, 233, 0.2));
    border-color: var(--primary);
    transform: translateX(4px);
}

.model-card.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.model-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: clamp(6px, 0.8vw, 8px);
}

.model-name {
    font-size: clamp(13px, 1.4vw, 15px);
    font-weight: 600;
    margin-bottom: clamp(2px, 0.4vw, 4px);
}

.model-provider {
    font-size: clamp(11px, 1vw, 12px);
    color: var(--gray);
    background: rgba(255, 255, 255, 0.05);
    padding: 2px clamp(6px, 0.8vw, 8px);
    border-radius: 10px;
    display: inline-block;
}

.model-stats {
    display: flex;
    gap: clamp(8px, 1vw, 12px);
    margin-top: clamp(6px, 0.8vw, 8px);
}

.stat {
    display: flex;
    align-items: center;
    gap: clamp(2px, 0.4vw, 4px);
    font-size: clamp(10px, 0.9vw, 11px);
    color: var(--gray);
}

.stat i {
    font-size: clamp(9px, 0.8vw, 10px);
}

.model-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--accent);
    color: var(--dark);
    font-size: clamp(9px, 0.8vw, 10px);
    font-weight: 600;
    padding: 2px clamp(6px, 0.8vw, 8px);
    border-radius: 10px;
}

/* Chat Area */
.chat-area {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
    position: relative;
}

.chat-header {
    padding: clamp(16px, 2vw, 20px) clamp(20px, 2.4vw, 24px);
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    flex-shrink: 0;
    z-index: 10;
}

.chat-info {
    display: flex;
    align-items: center;
    gap: clamp(8px, 1vw, 12px);
}

.model-avatar {
    width: clamp(32px, 3.5vw, 40px);
    height: clamp(32px, 3.5vw, 40px);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(14px, 1.6vw, 18px);
}

.chat-title {
    font-size: clamp(16px, 1.8vw, 18px);
    font-weight: 600;
}

.chat-subtitle {
    font-size: clamp(12px, 1.2vw, 13px);
    color: var(--gray);
}

.chat-actions {
    display: flex;
    gap: clamp(6px, 0.8vw, 8px);
}

.icon-btn {
    width: clamp(32px, 3.5vw, 36px);
    height: clamp(32px, 3.5vw, 36px);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    color: var(--light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.icon-btn.danger:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.4);
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: clamp(16px, 2vw, 24px);
    min-height: 0;
    display: flex;
    flex-direction: column;
}

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

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

.messages-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

/* Welcome State */
.welcome-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 0;
    height: 100%;
    padding: clamp(16px, 2vw, 24px);
}

.welcome-icon {
    font-size: clamp(48px, 6vw, 64px);
    margin-bottom: clamp(16px, 2vw, 24px);
    opacity: 0.5;
}

.welcome-title {
    font-size: clamp(20px, 2.8vw, 28px);
    font-weight: 700;
    margin-bottom: clamp(8px, 1vw, 12px);
    background: linear-gradient(135deg, var(--light), var(--gray-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    color: var(--gray);
    font-size: clamp(14px, 1.6vw, 16px);
    max-width: min(400px, 90vw);
    line-height: 1.6;
}

/* Messages List */
.messages {
    display: flex;
    flex-direction: column;
    gap: clamp(8px, 1vw, 12px);
    min-height: 0;
    flex: 1;
}

.message {
    display: flex;
    gap: clamp(12px, 1.4vw, 16px);
    animation: slideIn 0.3s ease-out;
    max-width: 100%;
}

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

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

.message-avatar {
    width: clamp(32px, 3.5vw, 40px);
    height: clamp(32px, 3.5vw, 40px);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(14px, 1.6vw, 18px);
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--secondary), #0d9488);
}

.message-content {
    max-width: calc(100vw / 3);
    padding: clamp(8px, 1vw, 12px) clamp(12px, 1.5vw, 16px);
    border-radius: var(--radius-md);
    font-size: clamp(13px, 1.2vw, 14px);
    line-height: 1.5;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message.bot .message-content {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--light);
    border-bottom-left-radius: 4px;
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-bottom-right-radius: 4px;
}

.message-time {
    font-size: clamp(10px, 0.9vw, 11px);
    color: var(--gray);
    margin-top: clamp(6px, 0.8vw, 8px);
    text-align: right;
}

.message.user .message-time {
    text-align: left;
}

/* IMPROVED CODE BLOCK STYLING WITH LINE WRAPPING */
.code-block {
    position: relative;
    background: var(--code-bg);
    border-radius: var(--radius-md);
    margin: clamp(12px, 1.4vw, 16px) 0;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(8px, 1vw, 10px) clamp(12px, 1.4vw, 16px);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

.code-language {
    font-size: clamp(10px, 0.9vw, 11px);
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.code-actions {
    display: flex;
    gap: clamp(4px, 0.6vw, 6px);
}

.code-action-btn {
    width: clamp(24px, 2.5vw, 28px);
    height: clamp(24px, 2.5vw, 28px);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    color: var(--gray-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: clamp(10px, 0.9vw, 12px);
}

.code-action-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.code-action-btn.copied {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

/* IMPROVED PRE AND CODE STYLING FOR LINE WRAPPING */
pre {
    margin: 0;
    padding: clamp(12px, 1.4vw, 18px);
    overflow-x: auto;
    overflow-y: auto;
    font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    font-size: clamp(13px, 1.2vw, 14px);
    line-height: 1.6;
    tab-size: 2;
    white-space: pre-wrap;
    word-break: break-word;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
    background: var(--code-bg);
    border-radius: 0 0 8px 8px;
}

/* Syntax highlighting improvements */
.hljs {
    background: transparent !important;
    padding: 0 !important;
    overflow-x: visible !important;
    white-space: pre-wrap !important;
    word-wrap: break-word !important;
    overflow-wrap: break-word !important;
    word-break: break-word !important;
}

/* Code block wrapper */
.code-block {
    background: var(--code-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    margin: 12px 0;
    overflow: hidden;
}

/* Highlight.js comprehensive syntax highlighting */
.hljs-attr, .hljs-attribute {
    color: #f92672;
}

.hljs-string, .hljs-title.class_.inherited__ {
    color: #e6db74;
}

.hljs-number {
    color: #ae81ff;
}

.hljs-literal {
    color: #ae81ff;
}

.hljs-keyword {
    color: #ff79c6;
}

.hljs-function {
    color: #8be9fd;
}

.hljs-params {
    color: #f1fa8c;
}

.hljs-comment {
    color: #75715e;
}

.hljs-name {
    color: #66d9ef;
}

.hljs-tag {
    color: #f92672;
}

.hljs-title {
    color: #a1efe4;
}

.hljs-type {
    color: #66d9ef;
}

.hljs-variable {
    color: #f8f8f2;
}

.hljs-builtin {
    color: #a1efe4;
}

.hljs-selector-tag {
    color: #f92672;
}

.hljs-meta {
    color: #75715e;
}

.hljs-punctuation {
    color: #f8f8f2;
}

/* Line numbers for code blocks */
.line-numbers {
    display: none;
}

/* Inline Code - IMPROVED */
.message-content code:not(pre code),
.message-content .inline-code {
    background: rgba(255, 255, 255, 0.08);
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    font-size: clamp(12px, 1.1vw, 13px);
    color: #f1fa8c;
    word-break: break-word;
    white-space: normal;
    border: 1px solid rgba(241, 250, 140, 0.2);
    display: inline-block;
}

/* Markdown Elements with better wrapping */
.message-content h1, 
.message-content h2, 
.message-content h3 {
    margin: clamp(12px, 1.4vw, 20px) 0 clamp(8px, 1vw, 10px) 0;
    color: white;
    font-weight: 600;
    line-height: 1.3;
    word-wrap: break-word;
}

.message-content h1 { 
    font-size: clamp(18px, 2vw, 22px); 
}
.message-content h2 { 
    font-size: clamp(16px, 1.8vw, 19px); 
}
.message-content h3 { 
    font-size: clamp(14px, 1.6vw, 16px); 
}

.message-content p {
    margin-bottom: clamp(8px, 1vw, 12px);
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.6;
}

.message-content ul, 
.message-content ol {
    margin: clamp(12px, 1.4vw, 16px) 0;
    padding-left: clamp(24px, 3vw, 32px);
}

.message-content li {
    margin-bottom: clamp(6px, 0.8vw, 10px);
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.6;
}

.message-content blockquote {
    border-left: 4px solid var(--primary);
    padding: clamp(8px, 1vw, 12px) clamp(12px, 1.4vw, 16px);
    margin: clamp(12px, 1.4vw, 16px) 0;
    background: rgba(124, 58, 237, 0.1);
    color: var(--gray-light);
    font-style: italic;
    word-wrap: break-word;
    overflow-wrap: break-word;
    border-radius: 4px;
}

/* Code block formatting with language indicator */
.code-block {
    background: var(--code-bg);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    margin: 12px 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.code-block[data-language]::before {
    content: attr(data-language);
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* Horizontal rule styling */
.message-content hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    margin: clamp(16px, 2vw, 24px) 0;
}

.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: clamp(12px, 1.4vw, 16px) 0;
    overflow-x: auto;
    display: block;
}

.message-content th, 
.message-content td {
    padding: clamp(8px, 1vw, 10px);
    border: 1px solid var(--card-border);
    text-align: left;
    word-break: break-word;
}

.message-content th {
    background: rgba(255, 255, 255, 0.05);
    font-weight: 600;
}

/* Input Area */
.input-area {
    padding: clamp(16px, 2vw, 20px) clamp(20px, 2.4vw, 24px);
    border-top: 1px solid var(--card-border);
    background: rgba(255, 255, 255, 0.02);
    flex-shrink: 0;
    z-index: 10;
}

.error-container {
    margin-bottom: clamp(8px, 1vw, 12px);
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: clamp(10px, 1.2vw, 12px) clamp(12px, 1.4vw, 16px);
    border-radius: var(--radius-md);
    font-size: clamp(13px, 1.2vw, 14px);
    display: flex;
    align-items: center;
    gap: clamp(6px, 0.8vw, 8px);
    animation: slideDown 0.3s ease;
}

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

.input-wrapper {
    display: flex;
    gap: clamp(8px, 1vw, 12px);
    align-items: flex-end;
}

.input-container {
    flex: 1;
    position: relative;
}

textarea {
    width: 100%;
    padding: clamp(12px, 1.4vw, 16px) clamp(16px, 2vw, 20px);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    color: var(--light);
    font-size: clamp(14px, 1.4vw, 15px);
    font-family: inherit;
    resize: none;
    min-height: 56px;
    max-height: 150px;
    transition: var(--transition);
    line-height: 1.5;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

textarea::placeholder {
    color: var(--gray);
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.input-actions {
    position: absolute;
    right: 12px;
    bottom: 12px;
    display: flex;
    gap: clamp(6px, 0.8vw, 8px);
}

.input-action-btn {
    width: clamp(24px, 2.5vw, 28px);
    height: clamp(24px, 2.5vw, 28px);
    background: transparent;
    border: none;
    color: var(--gray);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.input-action-btn:hover {
    color: var(--light);
}

.send-btn {
    width: clamp(48px, 5vw, 56px);
    height: clamp(48px, 5vw, 56px);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(16px, 2vw, 20px);
    transition: var(--transition);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(124, 58, 237, 0.3);
}

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

.send-icon {
    transition: var(--transition);
}

.loader {
    width: clamp(20px, 2.5vw, 24px);
    height: clamp(20px, 2.5vw, 24px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Typing Indicator */
.typing-indicator {
    display: inline-flex;
    gap: clamp(3px, 0.4vw, 4px);
    padding: clamp(6px, 0.8vw, 8px) 0;
}

.typing-indicator span {
    width: clamp(6px, 0.8vw, 8px);
    height: clamp(6px, 0.8vw, 8px);
    background: var(--gray);
    border-radius: 50%;
    animation: bounce 1.4s infinite;
}

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

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

@keyframes bounce {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-6px);
    }
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: clamp(16px, 2vw, 24px);
    right: clamp(16px, 2vw, 24px);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: clamp(12px, 1.4vw, 16px) clamp(16px, 2vw, 20px);
    color: var(--light);
    font-size: clamp(13px, 1.2vw, 14px);
    display: flex;
    align-items: center;
    gap: clamp(8px, 1vw, 12px);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
    max-width: min(400px, 90vw);
    word-break: break-word;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    background: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.4);
}

.toast.error {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.4);
}

/* RESPONSIVE BREAKPOINTS */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: clamp(240px, 25vw, 320px) 1fr;
    }
}

@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-rows: clamp(300px, 40vh, 400px) 1fr;
        height: calc(100vh - 120px);
    }
    
    .header {
        flex-direction: column;
        gap: clamp(12px, 1.5vw, 16px);
        text-align: center;
    }
    
    .header-actions {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .message-content {
        max-width: 85%;
        padding: 12px 16px;
    }
    
    .chat-actions {
        display: none;
    }
    
    .main-content {
        grid-template-rows: clamp(250px, 35vh, 350px) 1fr;
        gap: 12px;
    }
    
    .code-block pre {
        padding: 10px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 8px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .header-btn span {
        display: none;
    }
    
    .header-btn {
        padding: 8px 12px;
    }
    
    .main-content {
        grid-template-rows: clamp(200px, 30vh, 250px) 1fr;
    }
    
    .message {
        gap: 8px;
    }
    
    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 14px;
    }
    
    .message-content {
        max-width: 75%;
        padding: 10px 12px;
        font-size: 13px;
    }
    
    .code-block pre {
        padding: 8px;
        font-size: 12px;
    }
}

/* Print styles */
@media print {
    .sidebar, .header-actions, .input-area, .chat-actions {
        display: none !important;
    }
    
    .main-content {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .chat-area {
        border: none;
        background: white;
        color: black;
    }
    
    .message-content {
        background: white !important;
        color: black !important;
        border: 1px solid #ddd !important;
    }
}