app/frontend/style.css

:root {
    --bg-primary: #0a0a0c;
    --bg-secondary: #16161a;
    --bg-tertiary: #222226;
    --text-primary: #f8f8fc;
    --text-secondary: #9494a5;
    --accent-blue: #60a5fa;
    --accent-purple: #c084fc;
    --accent-gradient: linear-gradient(135deg, #3b82f6, #9333ea, #db2777);
    --border-color: rgba(255, 255, 255, 0.05);
    --input-bg: #1a1a1e;
    --glass-bg: rgba(13, 13, 15, 0.85);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --radius-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    line-height: 1.6;
}

.app-container {
    display: flex;
    height: 100%;
    max-width: 100vw;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

/* Top Navigation */
.top-nav {
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    position: sticky;
    top: 0;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.model-tag {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-blue);
    transition: all 0.2s ease;
}

.model-tag:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 0 20px rgba(90, 140, 255, 0.2);
}

.model-tag i {
    font-size: 16px;
}

.model-selector-container {
    display: flex;
    align-items: center;
}

.status-container {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 10px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.status-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    display: inline-block;
    transition: all 0.3s ease;
}

.status-dot.online {
    background-color: #4ade80;
    box-shadow: 0 0 8px rgba(74, 222, 128, 0.5);
}

.status-dot.offline {
    background-color: #f87171;
    box-shadow: 0 0 8px rgba(248, 113, 113, 0.5);
}

.status-dot.unknown {
    background-color: #9ca3af;
}

.nav-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 18px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-blue);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(90, 140, 255, 0.2);
}

.nav-btn i {
    font-size: 14px;
}

.avatar-small {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
    color: white;
    box-shadow: 0 2px 8px rgba(66, 133, 244, 0.3);
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 24px 15% 180px;
    scroll-behavior: smooth;
    display: flex;
    flex-direction: column;
}

/* Custom Scrollbar */
.chat-container::-webkit-scrollbar {
    width: 6px;
}

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

.chat-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

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

/* Welcome Screen */
.welcome-screen {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    padding: 40px 20px;
    animation: fadeInUp 0.6s ease;
}

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

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

.welcome-screen h1 {
    font-size: 3rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.welcome-screen p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 500px;
}

.suggested-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    width: 100%;
}

.card {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    text-align: left;
    color: var(--text-primary);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card:hover {
    background: var(--bg-tertiary);
    border-color: rgba(90, 140, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.card:hover::before {
    transform: scaleX(1);
}

/* Message Styles */
.message {
    margin-bottom: 32px;
    display: flex;
    gap: 16px;
    max-width: 85%;
    animation: messageSlideIn 0.4s ease;
}

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

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

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

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

.message .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.message.user .avatar {
    background: var(--accent-gradient);
}

.message.assistant .avatar {
    background: var(--bg-secondary);
}

.message.assistant .avatar img {
    width: 70%;
    height: 70%;
    object-fit: contain;
}

.message.user .avatar i {
    color: white;
    font-size: 16px;
}

.content {
    line-height: 1.7;
    font-size: 15px;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: normal;
    hyphens: auto;
    min-width: 0;
    max-width: 100%;
}

.message.user .content {
    background: var(--bg-tertiary);
    padding: 12px 18px;
    border-radius: 18px 18px 4px 18px;
    border: 1px solid var(--border-color);
    max-width: 100%;
    word-break: break-word;
    box-shadow: var(--shadow-sm);
}

.message.assistant .content {
    color: var(--text-primary);
    padding: 8px 0;
    word-break: break-word;
}

.message.assistant .content p {
    margin-bottom: 12px;
}

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

/* Input Area */
.input-area {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px 15% 24px;
    background: linear-gradient(to top, var(--bg-primary) 60%, transparent);
    z-index: 50;
}

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

.input-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 14px 20px;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.input-container:focus-within {
    border-color: rgba(90, 140, 255, 0.4);
    box-shadow: 0 8px 32px rgba(90, 140, 255, 0.15);
}

textarea {
    background: transparent;
    border: none;
    color: var(--text-primary);
    resize: none;
    outline: none;
    padding: 8px 0;
    font-size: 15px;
    max-height: 200px;
    min-height: 24px;
    line-height: 1.5;
    font-family: inherit;
    width: 100%;
}

textarea::placeholder {
    color: var(--text-secondary);
}

.input-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
}

.input-actions-left {
    display: flex;
    gap: 12px;
    align-items: center;
}

.input-actions button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    width: 36px;
    height: 36px;
}

.input-actions button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: scale(1.05);
}

#send-btn {
    background: var(--accent-blue);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

#send-btn:hover {
    background: #4a7de8;
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(90, 140, 255, 0.4);
}

#send-btn.disabled {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.5;
    transform: none;
    box-shadow: none;
}

#send-btn.stop-mode {
    background: #f87171;
    color: white;
    box-shadow: 0 4px 12px rgba(248, 113, 113, 0.4);
    animation: stopPulse 2s infinite;
}

#send-btn.stop-mode:hover {
    background: #ef4444;
}

@keyframes stopPulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 0 15px rgba(248, 113, 113, 0.6);
    }

    100% {
        transform: scale(1);
    }
}

.disclaimer {
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 12px;
    opacity: 0.7;
}

/* Code Block Styling */
.code-block-wrapper {
    background: #0d0d0f;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin: 20px 0;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.code-header {
    background: #1a1a1e;
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.code-lang {
    font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.copy-code-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.copy-code-btn.success {
    color: #4ade80;
}

pre {
    margin: 0 !important;
    padding: 20px;
    background: #0d0d0f !important;
    overflow-x: auto;
}

pre code {
    font-family: 'SF Mono', 'Consolas', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.6;
    white-space: pre;
    word-break: normal;
}

/* Inline code */
:not(pre)>code {
    background: var(--bg-tertiary);
    padding: 3px 8px;
    border-radius: 6px;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.9em;
    color: var(--accent-blue);
    border: 1px solid var(--border-color);
}

/* Preview Container */
.preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
}

.preview-item {
    position: relative;
    width: 70px;
    height: 70px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
    background: var(--bg-tertiary);
    transition: all 0.2s ease;
}

.preview-item:hover {
    border-color: var(--accent-blue);
    transform: scale(1.02);
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-item .file-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-size: 10px;
    color: var(--text-secondary);
    gap: 4px;
}

.preview-item .file-icon i {
    font-size: 20px;
}

.preview-item button {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    transition: all 0.2s ease;
    backdrop-filter: blur(4px);
}

.preview-item button:hover {
    background: #ff4d4d;
    transform: scale(1.1);
}

/* Tool Switch */
.tool-switch-container {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    cursor: pointer;
    user-select: none;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.tool-switch-container:hover {
    background: #2d2d32;
    border-color: var(--accent-blue);
}

.tool-switch-container input {
    display: none;
}

.switch-slider {
    width: 32px;
    height: 16px;
    background: #444;
    border-radius: 10px;
    position: relative;
    transition: 0.3s;
}

.switch-slider::before {
    content: "";
    position: absolute;
    height: 12px;
    width: 12px;
    left: 2px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border-radius: 50%;
    transition: 0.3s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input:checked+.switch-slider {
    background: var(--accent-blue);
}

input:checked+.switch-slider::before {
    transform: translateY(-50%) translateX(16px);
}

.switch-label {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
}

input:checked~.switch-label {
    color: var(--accent-blue);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typing 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 typing {

    0%,
    80%,
    100% {
        transform: scale(0);
    }

    40% {
        transform: scale(1);
    }
}

/* Responsive Design */

/* Tablet */
@media (max-width: 1024px) {

    .chat-container,
    .input-area {
        padding-left: 8%;
        padding-right: 8%;
    }

    .welcome-screen h1 {
        font-size: 2.5rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .top-nav {
        padding: 12px 16px;
    }

    .nav-btn span {
        display: none;
    }

    .nav-btn {
        padding: 10px;
        border-radius: 50%;
    }

    .model-tag {
        padding: 6px 12px;
        font-size: 13px;
    }

    .chat-container {
        padding: 16px 4% 160px;
    }

    .input-area {
        padding: 12px 4% 16px;
    }

    .welcome-screen {
        padding: 24px 16px;
    }

    .welcome-screen h1 {
        font-size: 1.8rem;
    }

    .welcome-screen p {
        font-size: 1rem;
        margin-bottom: 24px;
    }

    .suggested-cards {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .card {
        padding: 14px 16px;
        font-size: 13px;
    }

    .message {
        max-width: 95%;
        margin-bottom: 20px;
        gap: 8px;
        min-width: 0;
    }

    .message .avatar {
        width: 32px;
        height: 32px;
        flex-shrink: 0;
    }

    .message .avatar i {
        font-size: 13px;
    }

    .content {
        font-size: 14px;
        line-height: 1.6;
        word-break: normal;
        overflow-wrap: break-word;
        min-width: 0;
        max-width: calc(100% - 40px);
    }

    .message.user .content {
        padding: 10px 14px;
        border-radius: 18px 18px 4px 18px;
        max-width: 100%;
    }

    .input-container {
        padding: 10px 14px;
        border-radius: 22px;
    }

    textarea {
        font-size: 16px;
        /* Prevent zoom on iOS */
        padding: 4px 0;
    }

    .input-actions {
        margin-top: 6px;
    }

    .input-actions button {
        width: 34px;
        height: 34px;
        font-size: 15px;
    }

    .tool-switch-container {
        padding: 4px 10px;
    }

    .switch-label {
        font-size: 11px;
    }

    .switch-label i {
        font-size: 12px;
    }

    .disclaimer {
        font-size: 11px;
        margin-top: 8px;
    }

    /* Code blocks on mobile */
    .code-block-wrapper {
        margin: 12px -4%;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    pre {
        padding: 12px;
        font-size: 12px;
        white-space: pre-wrap;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    pre code {
        font-size: 12px;
        line-height: 1.5;
        word-break: normal;
        white-space: pre-wrap;
    }

    .preview-item {
        width: 60px;
        height: 60px;
    }
}

/* Small Mobile */
@media (max-width: 380px) {
    .welcome-screen h1 {
        font-size: 1.6rem;
    }

    .message {
        max-width: 95%;
    }

    .model-tag {
        font-size: 12px;
        padding: 5px 10px;
    }

    .model-tag i {
        font-size: 14px;
    }
}

/* Dark mode adjustments for syntax highlighting */
.hljs {
    background: transparent !important;
}

/* Markdown content styling */
.message.assistant .content h1,
.message.assistant .content h2,
.message.assistant .content h3,
.message.assistant .content h4 {
    margin: 20px 0 12px;
    color: var(--text-primary);
    font-weight: 600;
}

.message.assistant .content h1 {
    font-size: 1.5em;
}

.message.assistant .content h2 {
    font-size: 1.3em;
}

.message.assistant .content h3 {
    font-size: 1.15em;
}

.message.assistant .content ul,
.message.assistant .content ol {
    margin: 12px 0;
    padding-left: 24px;
}

.message.assistant .content li {
    margin: 6px 0;
}

.message.assistant .content a {
    color: var(--accent-blue);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.message.assistant .content a:hover {
    border-color: var(--accent-blue);
}

.message.assistant .content img {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: 12px 0;
}

.message.assistant .content blockquote {
    border-left: 3px solid var(--accent-blue);
    padding-left: 16px;
    margin: 12px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message.assistant .content table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.message.assistant .content th,
.message.assistant .content td {
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    text-align: left;
}

.message.assistant .content th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.message.assistant .content tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

/* Mobile table adjustments */
@media (max-width: 768px) {
    .message.assistant .content table {
        font-size: 13px;
    }

    .message.assistant .content th,
    .message.assistant .content td {
        padding: 8px 10px;
    }
}