:root {
    --bg-primary: #000000;
    --bg-secondary: #000000;
    --bg-tertiary: #000000;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #606060;
    --border: rgba(255, 255, 255, 0.1);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent: rgba(255, 255, 255, 0.6);
    --accent-hover: rgba(255, 255, 255, 0.7);
    --sidebar-width: 180px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    margin: 0;
    padding: 0;
    border: none;
}

.glass {
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
}

.sidebar {
    width: 180px;
    min-width: 180px;
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    position: relative;
    z-index: 100;
    box-shadow: none;
    outline: none;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-shrink: 0;
}

.new-chat-btn {
    width: 100%;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 0 12px;
    transition: background 0.15s;
}

.new-chat-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

.new-chat-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.new-chat-icon svg {
    width: 20px;
    height: 20px;
    display: block;
}

.new-chat-text {
    font-size: 14px;
}

.sidebar-search-wrapper {
    position: relative;
    width: 100%;
}

.sidebar-search {
    width: 100%;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13px;
    padding: 0 12px 0 44px;
    outline: none;
    font-family: inherit;
}

.sidebar-search::placeholder {
    color: var(--text-tertiary);
}

.sidebar-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-search-icon svg {
    width: 20px;
    height: 20px;
    display: block;
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.chat-list::-webkit-scrollbar {
    display: none;
}

.chat-item {
    min-height: 44px;
    padding: 10px 12px;
    margin-bottom: 4px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: background 0.15s;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.chat-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.chat-item.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.chat-item-content {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.chat-item-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.chat-item-icon svg {
    width: 20px;
    height: 20px;
    display: block;
}

.chat-item-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.chat-delete {
    opacity: 0;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 6px;
    transition: opacity 0.15s, color 0.15s;
    font-size: 18px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

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

.chat-delete:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.sidebar-footer {
    border-top: 1px solid var(--border);
    padding: 12px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-footer-btn {
    width: 100%;
    height: 40px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 0 12px;
    transition: all 0.15s;
}

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

.sidebar-footer-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-footer-icon svg {
    width: 20px;
    height: 20px;
    display: block;
}

.sidebar-footer-text {
    font-size: 13px;
}

.user-profile-btn {
    justify-content: flex-start;
}

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

.top-bar {
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
    height: 64px;
    flex-shrink: 0;
}

.app-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.model-badge {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 400;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    scroll-behavior: smooth;
    will-change: scroll-position;
}

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

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

.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.message-container {
    max-width: 48rem;
    margin: 0 auto;
    padding: 24px 16px 100px;
}

.message-wrapper {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    animation: messageSlide 0.3s ease-out;
}

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-wrapper.user {
    align-items: flex-end;
}

.message-wrapper.assistant {
    align-items: flex-start;
}

.message-role {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 500;
    padding: 0 4px;
}

.message-content {
    max-width: 85%;
}

.message-bubble {
    font-size: 15px;
    line-height: 1.6;
    word-wrap: break-word;
    color: var(--text-primary);
    padding: 2px 0;
}

.message-bubble p {
    margin: 0 0 8px 0;
}

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

.message-bubble code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.9em;
}

.message-bubble pre {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;
}

.message-bubble pre code {
    background: none;
    padding: 0;
    border: none;
}

.message-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: 8px;
    margin-bottom: 8px;
    border: 1px solid var(--border);
}

.typing-dots {
    display: inline-flex;
    gap: 6px;
    padding: 12px 16px;
    background: transparent;
    border-radius: 16px;
    border: none;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) { animation-delay: 0s; }
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

.input-area {
    padding: 16px 24px 24px;
    background: transparent;
    border-top: none;
    flex-shrink: 0;
}

.input-container {
    max-width: 48rem;
    margin: 0 auto;
}

.input-wrapper {
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: border-color 0.15s;
}

.input-wrapper:focus-within {
    border-color: rgba(255, 255, 255, 0.25);
}

.input-controls {
    display: flex;
    gap: 4px;
    align-items: center;
}

.attach-btn {
    display: none;
}

.input-field {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    font-family: inherit;
    resize: none;
    min-height: 24px;
    max-height: 200px;
    line-height: 24px;
    padding: 0;
}

.input-field::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.send-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.send-btn:active:not(:disabled) {
    transform: translateY(0);
}

.send-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.send-btn svg {
    width: 16px;
    height: 16px;
}

.image-preview-container {
    display: none;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 48px 24px;
}

.empty-icon {
    width: 48px;
    height: 48px;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 16px;
    opacity: 0.8;
}

.empty-icon svg {
    width: 100%;
    height: 100%;
}

.empty-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-text {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
    max-width: 48rem;
    width: 100%;
    margin: 0 auto;
}

.suggestion-card {
    padding: 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.15s;
    text-align: left;
}

.suggestion-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.suggestion-icon {
    width: 20px;
    height: 20px;
    margin-bottom: 8px;
    display: block;
    color: var(--text-secondary);
}

.suggestion-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.error-message {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 20px;
    background: rgba(239, 68, 68, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #ef4444;
    font-size: 14px;
    z-index: 1000;
    animation: slideDown 0.3s ease-out;
    max-width: 400px;
    display: flex;
    align-items: center;
    gap: 8px;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.error-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.settings-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.settings-modal.active {
    display: flex;
}

.settings-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    animation: modalSlide 0.3s ease-out;
    display: flex;
    flex-direction: column;
}

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

.settings-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.settings-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.settings-close {
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.settings-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.settings-main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.settings-sidebar {
    width: 200px;
    border-right: 1px solid var(--border);
    padding: 16px 8px;
    flex-shrink: 0;
    overflow-y: auto;
}

.settings-nav-item {
    padding: 10px 12px;
    margin-bottom: 4px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.settings-nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.settings-nav-item.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.settings-nav-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.settings-nav-icon svg {
    width: 20px;
    height: 20px;
    display: block;
}

.settings-body {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.settings-panel {
    display: none;
}

.settings-panel.active {
    display: block;
    animation: panelFade 0.2s ease-out;
}

@keyframes panelFade {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.settings-panel-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.settings-panel-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.settings-section {
    margin-bottom: 32px;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.settings-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.settings-option:last-child {
    border-bottom: none;
}

.settings-option-label {
    flex: 1;
    padding-right: 20px;
}

.settings-option-name {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.settings-option-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.settings-slider {
    width: 200px;
}

.slider-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.slider-value {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

.slider {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.15s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: rgba(255, 255, 255, 0.9);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.2s;
    flex-shrink: 0;
}

.toggle.active {
    background: rgba(255, 255, 255, 0.3);
}

.toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
}

.toggle.active .toggle-slider {
    transform: translateX(20px);
}

.settings-select {
    min-width: 200px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 8px 12px;
    font-size: 13px;
    cursor: pointer;
    outline: none;
    transition: all 0.15s;
}

.settings-select:hover {
    background: rgba(255, 255, 255, 0.08);
}

.settings-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.settings-info-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.settings-info-box strong {
    color: var(--text-primary);
}