:root {
    --background-color: #121212;
    --panel-background-color: #1e1e1e;
    --border-color: #333;
    --text-color: #e0e0e0;
    --text-color-secondary: #a0a0a0;
    --primary-color: #007bff;
    --primary-color-hover: #0056b3;
    --button-secondary-bg: #333;
    --button-secondary-hover-bg: #444;
    --user-message-bg: #0056b3;
    --model-message-bg: #2a2a2a;
    --font-family: 'Inter', sans-serif;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    display: flex;
    justify-content: center;
    align-items: center;
}

#app {
    width: 100%;
    height: 100%;
}

.container {
    width: 100%;
    height: 100%;
    display: flex;
}

/* Main View */
.main-view {
    display: flex;
    width: 100%;
    height: 100%;
    background-color: #000;
}

.panel {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: width 0.3s ease, flex 0.3s ease;
}

.pdf-panel {
    flex: 1;
    background-color: var(--background-color);
    border-right: 1px solid var(--border-color);
    width: 50%;
}

.pdf-panel.hidden {
    flex: 0;
    width: 0;
    border-right: none;
}


.assistant-panel {
    flex: 1;
    background-color: var(--panel-background-color);
    padding: 1.5rem;
    gap: 1.5rem;
    width: 50%;
}

.assistant-panel.full-width {
    flex: 1;
    width: 100%;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: #2a2a2a;
}

.panel-header .filename {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.9rem;
    color: var(--text-color-secondary);
}

.close-button {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.close-button:hover {
    color: var(--text-color);
}

.pdf-viewer {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.pdf-page {
    position: relative;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.pdf-page canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.textLayer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    color: transparent;
}

.textLayer ::selection {
    background: rgba(0, 123, 255, 0.3);
}

/* Assistant Panel */
.assistant-panel h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.model-selector {
    display: flex;
    background-color: #333;
    border-radius: 8px;
    padding: 4px;
}

.model-selector button {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    background-color: transparent;
    color: var(--text-color-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.model-selector button.active {
    background-color: var(--primary-color);
    color: white;
}

.model-selector button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.input-area-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-area-container label {
    font-size: 0.8rem;
    color: var(--text-color-secondary);
}

.input-area {
    width: 100%;
    flex-grow: 1;
    background-color: #2a2a2a;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    resize: none;
}

.input-area:focus {
    outline: none;
    border-color: var(--primary-color);
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

.action-buttons button {
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, opacity 0.2s ease;
}

.action-buttons .primary {
    background-color: var(--primary-color);
    color: white;
}

.action-buttons .primary:hover {
    background-color: var(--primary-color-hover);
}

.action-buttons .secondary {
    background-color: var(--button-secondary-bg);
    color: var(--text-color);
}

.action-buttons .secondary:hover {
    background-color: var(--button-secondary-hover-bg);
}

.action-buttons button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Chat Interface */
.chat-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    gap: 1rem;
}

.chat-history {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 10px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
}

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

.chat-message.model {
    align-self: flex-start;
    align-items: flex-start;
}

.message-content {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
}

.chat-message.user .message-content {
    background-color: var(--user-message-bg);
    color: white;
    border-bottom-right-radius: 2px;
}

.chat-message.model .message-content {
    background-color: var(--model-message-bg);
    color: var(--text-color);
    border-bottom-left-radius: 2px;
}

.message-content p {
    margin: 0;
}
.message-content ul, .message-content ol {
    padding-left: 20px;
}

.chat-form {
    display: flex;
    gap: 0.75rem;
}

.chat-input {
    flex-grow: 1;
    background-color: #2a2a2a;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    resize: none;
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

@media (max-width: 800px) {
    .main-view {
        flex-direction: column;
    }

    .panel {
        width: 100% !important;
        flex: 1 !important;
        border-right: none;
        height: auto;
    }
    
    .assistant-panel {
        flex-grow: 1;
        height: 100%;
    }
}