:root {
    /* Spacing System */
    --spacing: 0.25rem;

    /* Background Layers - DARK THEME */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a28;
    --bg-elevated: #22223a;

    /* Text Hierarchy */
    --text-high-em: #ffffff;
    --text-mid-em: #d4d4d4;
    --text-low-em: #a3a3a3;
    --text-lowest-em: #737373;

    /* Brand Colors - GREEN ACCENT */
    --color-brand: #00ff41;
    --color-brand-hover: #33ff66;
    --color-brand-opacity-40: rgba(0, 255, 65, 0.4);
    --color-brand-opacity-30: rgba(0, 255, 65, 0.3);
    --color-brand-opacity-10: rgba(0, 255, 65, 0.1);

    /* Status Colors */
    --color-success: #00ff41;
    --color-alert: #ff0040;

    /* Borders */
    --color-border: #1a1a28;
    --color-border-lowest: #12121a;

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Z-Index */
    --z-header: 50;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-high-em);
    height: 100vh;
    overflow: hidden;
}

/* TOPBAR */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    padding: 0 calc(var(--spacing) * 8) 0 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--color-border-lowest);
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    backdrop-filter: blur(8px);
    height: 48px;
}

.topbar-actions {
    display: flex;
    align-items: stretch;
    gap: 0;
    flex: 1;
}

.topbar-title {
    font-family: 'Roboto Mono', monospace;
    font-weight: 100;
    font-size: 1.5rem;
    color: var(--color-brand);
    letter-spacing: 0.05em;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.topbar-title .dud {
    color: var(--text-lowest-em);
}

.topbar-spacer {
    flex: 1;
}

.topbar-btn {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing) * 2);
    color: var(--color-brand);
    padding: 0 calc(var(--spacing) * 4);
    border: none;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    border-right: 1px solid var(--color-border-lowest);
}

.topbar-btn:first-child {
    background: #12121a;
}

.topbar-btn:nth-child(2) {
    background: #1a1a28;
}

.topbar-btn:nth-child(3) {
    background: #12121a;
}

.topbar-btn:nth-child(4) {
    background: #1a1a28;
    border-right: none;
}

.topbar-btn:hover {
    color: var(--color-brand-hover);
    background: var(--bg-tertiary);
}

.topbar-btn-primary {
    background: var(--color-brand);
    color: var(--text-high-em);
}

.topbar-btn-primary:hover {
    background: var(--color-brand-hover);
    transform: translateY(-1px);
}

/* WELCOME MESSAGE */
.welcome-message {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 12px;
    line-height: 1.15;
    color: var(--text-mid-em);
    white-space: pre;
    max-width: 100%;
    letter-spacing: 0;
    font-weight: normal;
    overflow-x: auto;
    font-variant-ligatures: none;
    text-rendering: optimizeSpeed;
}

/* MAIN CONTAINER */
.container {
    display: flex;
    height: calc(100vh - 48px);
}

/* LEFT PANEL: CHAT */
.left-panel {
    width: 55%;
    background: var(--bg-primary);
    border-right: 1px solid var(--color-border-lowest);
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: calc(var(--spacing) * 6);
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing) * 4);
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--bg-elevated);
}

.message {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing) * 2);
    animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.message.user .message-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--color-border-lowest);
    align-self: flex-end;
    max-width: 80%;
}

.message.assistant .message-content {
    background: var(--bg-secondary);
    border: 1px solid var(--color-border-lowest);
    align-self: flex-start;
    max-width: 80%;
}

.message-content {
    padding: calc(var(--spacing) * 3) calc(var(--spacing) * 4);
    border-radius: var(--radius-lg);
    line-height: 1.6;
    word-wrap: break-word;
    font-size: 0.875rem;
    color: var(--text-mid-em);
}

.message-content pre {
    background: var(--bg-primary);
    padding: calc(var(--spacing) * 3);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: calc(var(--spacing) * 2) 0;
    border: 1px solid var(--color-border-lowest);
}

.message-content pre::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.message-content pre::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.message-content pre::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
}

.message-content pre::-webkit-scrollbar-thumb:hover {
    background: var(--color-brand-opacity-40);
}

.message-content pre::-webkit-scrollbar-corner {
    background: var(--bg-secondary);
}

.message-content code {
    font-family: 'Roboto Mono', 'Courier New', monospace;
    font-size: 0.8125rem;
    color: var(--color-brand);
}

.message-content strong,
.message-content b {
    font-weight: 600;
    color: var(--text-high-em);
}

.message-content em,
.message-content i {
    font-style: italic;
    color: var(--text-mid-em);
}

.message-content ul,
.message-content ol {
    margin: calc(var(--spacing) * 2) 0;
    padding-left: calc(var(--spacing) * 8);
}

.message-content li {
    margin: calc(var(--spacing) * 1) 0;
}

.message-content h1,
.message-content h2,
.message-content h3 {
    font-weight: 600;
    color: var(--text-high-em);
    margin: calc(var(--spacing) * 3) 0 calc(var(--spacing) * 2);
}

.message-content a {
    color: var(--color-brand);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

.chat-input-wrapper {
    background: var(--bg-primary);
    border-top: 1px solid var(--color-border-lowest);
    position: relative;
}

.chat-input-container {
    width: 100%;
    min-height: 60px;
    max-height: 180px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 0;
    display: flex;
    align-items: center;
    gap: calc(var(--spacing) * 2);
    padding: calc(var(--spacing) * 3) calc(var(--spacing) * 6);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-input-container:focus-within {
    background: var(--bg-elevated);
}

#chatInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-high-em);
    padding: 0;
    font-size: 0.875rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    outline: none;
    resize: none;
    overflow-y: auto;
    line-height: 1.5;
    max-height: 72px;
}

#chatInput::-webkit-scrollbar {
    width: 6px;
}

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

#chatInput::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: 3px;
}

#chatInput::placeholder {
    color: var(--text-lowest-em);
}

.chat-icon-btn {
    background: transparent;
    color: var(--color-brand);
    border: none;
    padding: calc(var(--spacing) * 2);
    cursor: pointer;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.chat-icon-btn:hover {
    color: var(--color-brand-hover);
    background: var(--color-brand-opacity-10);
}

.chat-icon-btn:disabled {
    color: var(--text-lowest-em);
    cursor: not-allowed;
}

/* Chat Settings Dropdown */
.chat-settings-dropdown {
    position: absolute;
    bottom: 100%;
    right: calc(var(--spacing) * 6);
    margin-bottom: calc(var(--spacing) * 2);
    background: var(--bg-elevated);
    border: 1px solid var(--color-border-lowest);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing) * 4);
    min-width: 250px;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.5);
    display: none;
    animation: slideUpFade 0.2s ease-out;
    z-index: 100;
}

.chat-settings-dropdown.active {
    display: block;
}

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

.chat-settings-item {
    margin-bottom: calc(var(--spacing) * 6);
}

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

.chat-settings-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-mid-em);
    margin-bottom: calc(var(--spacing) * 2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.chat-settings-toggle {
    display: flex;
    gap: 0;
}

.chat-toggle-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--color-border-lowest);
    border-right: none;
    color: var(--text-mid-em);
    padding: calc(var(--spacing) * 2) calc(var(--spacing) * 3);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.15s ease;
    flex: 1;
    white-space: nowrap;
}

.chat-toggle-btn:last-child {
    border-right: 1px solid var(--color-border-lowest);
}

.chat-toggle-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-high-em);
}

.chat-toggle-btn.active {
    background: var(--color-brand-opacity-30);
    color: var(--text-high-em);
    border-color: var(--color-border-lowest);
    position: relative;
    z-index: 1;
}

.volume-slider {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    margin: calc(var(--spacing) * 2) 0;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--color-brand);
    border-radius: 50%;
    cursor: pointer;
}

.volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--color-brand);
    border-radius: 50%;
    border: none;
    cursor: pointer;
}

.volume-value {
    display: block;
    text-align: right;
    font-size: 0.75rem;
    color: var(--text-low-em);
    margin-top: calc(var(--spacing) * 1);
}

/* RIGHT PANEL: WORKSPACE */
.right-panel {
    width: 45%;
    display: flex;
    flex-direction: column;
}

/* AGENT CONTAINER */
.agent-container {
    height: 40%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--color-border-lowest);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

#live2d-canvas {
    width: 100%;
    height: 100%;
}

/* WORKSPACE CONTAINER */
.workspace-container {
    height: 60%;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

/* WORKSPACE TABS - Full Height Buttons */
.workspace-tabs {
    display: flex;
    align-items: stretch;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--color-border-lowest);
    height: 40px;
}

.tabs-spacer {
    flex: 1;
    background: var(--bg-secondary);
}

.tab-btn {
    background: transparent;
    color: var(--text-low-em);
    border: none;
    padding: 0 calc(var(--spacing) * 6);
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 2px solid transparent;
    border-right: 1px solid var(--color-border-lowest);
    display: flex;
    align-items: center;
}

.tab-btn:nth-child(1) {
    background: #12121a;
}

.tab-btn:nth-child(2) {
    background: #1a1a28;
}

.tab-btn:nth-child(3) {
    background: #12121a;
}

.tab-btn:nth-child(5) {
    background: #1a1a28;
}

.tab-btn:nth-child(6) {
    background: #12121a;
}

.tab-btn:nth-child(7) {
    background: #1a1a28;
}

.tab-btn:nth-child(8) {
    background: #12121a;
    border-right: none;
}

.tab-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-mid-em);
}

.tab-btn.active {
    color: var(--color-brand);
    border-bottom-color: var(--color-brand);
}

/* WORKSPACE CONTENT */
.workspace-content {
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* CODE SECTION */
.code-section {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #12121a;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
}

.code-section.active {
    opacity: 1;
    visibility: visible;
}

.editor-instance {
    display: none;
    width: 100%;
    height: 100%;
}

.editor-instance.active {
    display: block;
}

/* PREVIEW SECTION */
.preview-section {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
}

.preview-section.active {
    opacity: 1;
    visibility: visible;
}

#preview {
    width: 100%;
    height: 100%;
    border: none;
    background: #ffffff;
}

/* LOADING ANIMATION */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--bg-elevated);
    border-top-color: var(--color-brand);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* SETTINGS SECTION VIEW */
.settings-section-view {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
    overflow-y: auto;
}

.settings-section-view.active {
    opacity: 1;
    visibility: visible;
}

.settings-section-view::-webkit-scrollbar {
    width: 8px;
}

.settings-section-view::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.settings-section-view::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.settings-section-view::-webkit-scrollbar-thumb:hover {
    background: var(--bg-elevated);
}

.settings-container {
    padding: calc(var(--spacing) * 8) 0;
    max-width: 100%;
}

.settings-group {
    margin-bottom: calc(var(--spacing) * 10);
}

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

.settings-group h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-brand);
    margin-bottom: calc(var(--spacing) * 4);
    text-transform: none;
    letter-spacing: 0.05em;
    text-align: left;
    padding-left: 5%;
}

.settings-options-inline {
    display: flex;
    gap: 0;
}

.settings-option-inline {
    background: var(--bg-tertiary);
    border: 1px solid var(--color-border-lowest);
    border-right: none;
    color: var(--text-mid-em);
    padding: calc(var(--spacing) * 3) calc(var(--spacing) * 4);
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all 0.15s ease;
    flex: 1;
    white-space: nowrap;
}

.settings-option-inline:last-child {
    border-right: 1px solid var(--color-border-lowest);
}

.settings-option-inline:hover {
    background: var(--bg-elevated);
    color: var(--text-high-em);
}

.settings-option-inline.active {
    background: var(--color-brand-opacity-30);
    color: var(--text-high-em);
    border-color: var(--color-border-lowest);
    position: relative;
    z-index: 1;
}

/* Background Grid - 2 columns, None takes 2 rows */
.settings-bg-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: calc(var(--spacing) * 3);
    padding: 0 calc(var(--spacing) * 8);
}

.settings-bg-item {
    background: var(--bg-tertiary);
    border: 2px solid var(--color-border-lowest);
    padding: calc(var(--spacing) * 2);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all 0.15s ease;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-bg-none {
    grid-row: span 2;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-mid-em);
}

.settings-bg-item:hover {
    border-color: var(--text-low-em);
}

.settings-bg-item.active {
    border-color: var(--color-brand);
    background: var(--color-brand-opacity-10);
}

.settings-bg-item img {
    width: 100%;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    display: block;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .topbar {
        padding: calc(var(--spacing) * 2) calc(var(--spacing) * 4);
    }

    .topbar-title {
        font-size: 1.25rem;
    }

    .container {
        flex-direction: column;
    }

    .left-panel,
    .right-panel {
        width: 100%;
    }

    .agent-container {
        height: 30%;
    }

    .workspace-container {
        height: 70%;
    }
}