@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Lora:ital,wght@0,400;0,500;1,400&family=Sarabun:wght@300;400;500;600;700&display=swap');

:root {
    --bg-dark: #0b0f19;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(31, 41, 55, 0.8);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.15);
    
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.15);
    
    --warning: #f59e0b;
    --error: #ef4444;
    
    --font-en: 'Inter', sans-serif;
    --font-th: 'Sarabun', sans-serif;
    
    --glass-blur: blur(12px);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-th);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Background Gradients */
body::before {
    content: '';
    position: fixed;
    top: -20%;
    left: -10%;
    width: 60vw;
    height: 60vh;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    bottom: -10%;
    right: -10%;
    width: 50vw;
    height: 50vh;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

/* Header & Top Navigation */
header {
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    font-family: var(--font-en);
    letter-spacing: -0.025em;
}

.logo span {
    background: linear-gradient(135deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--primary), #a855f7);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.top-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Common Control Elements */
button {
    font-family: var(--font-th);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
    opacity: 0.6;
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.btn-danger:hover {
    background-color: rgba(239, 68, 68, 0.25);
}

.btn-small {
    padding: 0.25rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 0.375rem;
}

select, input[type="text"] {
    background-color: rgba(17, 24, 39, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-family: var(--font-th);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

select:focus, input[type="text"]:focus {
    border-color: var(--primary);
}

/* File Upload Drag & Drop Area */
.upload-container {
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
}

.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: rgba(255, 255, 255, 0.01);
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.03);
}

.dropzone-icon {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.dropzone p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.dropzone span {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    margin-top: 0.25rem;
}

/* Main Layout Grid */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    height: calc(100vh - 200px); /* Adjust based on header & upload area */
}

.sidebar {
    width: 260px;
    background: rgba(15, 23, 42, 0.4);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease-in-out, border-right-color 0.3s;
    overflow: hidden;
}

.sidebar.collapsed {
    width: 0px;
    border-right-color: transparent;
    opacity: 0;
    pointer-events: none;
}

.sidebar-title {
    padding: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.page-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.page-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.75rem;
    border-radius: 0.375rem;
    cursor: pointer;
    margin-bottom: 0.25rem;
    font-size: 0.85rem;
    transition: all 0.15s;
    border: 1px solid transparent;
}

.page-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.page-item.active {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.2);
    color: #fff;
    font-weight: 500;
}

.page-status {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--text-muted);
}

.page-status.pending {
    background: var(--text-muted);
}

.page-status.translating {
    background: var(--warning);
    box-shadow: 0 0 8px var(--warning);
    animation: pulse 1.5s infinite;
}

.page-status.completed {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.page-status.error {
    background: var(--error);
    box-shadow: 0 0 8px var(--error);
}

/* Split Pane Workspace */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.workspace-header {
    padding: 0.75rem 1.5rem;
    background: rgba(15, 23, 42, 0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.workspace-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.translation-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.panes-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

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

.pane-left {
    border-right: 1px solid var(--border-color);
}

.pane-title {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.02);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pane-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    line-height: 1.7;
    font-size: 1.05rem;
    white-space: pre-wrap;
    outline: none;
    font-family: var(--font-en);
}

.pane-right .pane-content {
    font-family: var(--font-th);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.005);
}

/* Textarea translation editor mode */
.translation-editor {
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-th);
    font-size: 1.05rem;
    line-height: 1.7;
    resize: none;
    outline: none;
}

/* Floating Status overlay */
.translation-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    border-radius: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    z-index: 10;
}

.spinner {
    width: 2.5rem;
    height: 2.5rem;
    border: 3px solid rgba(99, 102, 241, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Glossary Section (Sticky bottom drawer/collapsible) */
.glossary-drawer {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--border-color);
    transition: height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 60px; /* Collapsed state */
    overflow: hidden;
    position: relative;
    z-index: 90;
    display: flex;
    flex-direction: column;
}

.glossary-drawer.expanded {
    height: 320px; /* Expanded state */
}

.glossary-header {
    height: 60px;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.glossary-header-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
}

.glossary-content {
    flex: 1;
    padding: 0 2rem 1.5rem 2rem;
    display: flex;
    gap: 1.5rem;
    overflow: hidden;
}

.glossary-form {
    width: 320px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex-shrink: 0;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.glossary-table-container {
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
}

.glossary-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    text-align: left;
}

.glossary-table th {
    background: rgba(255, 255, 255, 0.02);
    padding: 0.6rem 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
}

.glossary-table td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.glossary-table tr:hover {
    background: rgba(255, 255, 255, 0.01);
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.85); }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* Alerts and Notifications overlay */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1000;
}

.toast {
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    padding: 0.75rem 1.25rem;
    border-radius: 0.375rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    min-width: 250px;
    max-width: 400px;
}

.toast.toast-error {
    border-left-color: var(--error);
}

.toast.toast-success {
    border-left-color: var(--success);
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Status summary styling on main controls */
.progress-summary {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-bar-container {
    width: 150px;
    height: 0.35rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--success));
    width: 0%;
    transition: width 0.3s;
}

/* Library / Book Cards */
.book-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.book-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    background: var(--bg-card-hover);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.1);
}

.book-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.book-card-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.book-card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
}

/* Reading Toolbar */
.reading-toolbar {
    background: rgba(15, 23, 42, 0.4);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toolbar-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    user-select: none;
}

/* Theme buttons */
.theme-btn {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    padding: 0;
    transition: transform 0.15s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.theme-btn:hover {
    transform: scale(1.2);
}

.theme-btn.active {
    border-color: var(--primary);
    transform: scale(1.1);
}

.theme-dark { background-color: #0b0f19; }
.theme-charcoal { background-color: #1f2937; }
.theme-sepia { background-color: #f4ecd8; }
.theme-light { background-color: #ffffff; }

/* Themes applied to panes */
.panes-container.theme-dark {
    background-color: #0b0f19;
}
.panes-container.theme-dark .pane-left {
    border-right-color: var(--border-color);
}
.panes-container.theme-dark .pane-title {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-muted);
    border-bottom-color: var(--border-color);
}
.panes-container.theme-dark .pane-content, 
.panes-container.theme-dark .translation-editor {
    color: #f3f4f6;
    background-color: transparent;
}

.panes-container.theme-charcoal {
    background-color: #18181b;
}
.panes-container.theme-charcoal .pane-left {
    border-right-color: rgba(255, 255, 255, 0.05);
}
.panes-container.theme-charcoal .pane-title {
    background: rgba(255, 255, 255, 0.01);
    color: #71717a;
    border-bottom-color: rgba(255, 255, 255, 0.05);
}
.panes-container.theme-charcoal .pane-content,
.panes-container.theme-charcoal .translation-editor {
    color: #e4e4e7;
    background-color: transparent;
}

.panes-container.theme-sepia {
    background-color: #f4ecd8;
}
.panes-container.theme-sepia .pane-left {
    border-right-color: #e4d8bc;
}
.panes-container.theme-sepia .pane-title {
    background: rgba(0, 0, 0, 0.03);
    color: #7c6a46;
    border-bottom-color: #e4d8bc;
}
.panes-container.theme-sepia .pane-content,
.panes-container.theme-sepia .translation-editor {
    color: #433422;
    background-color: transparent;
}
.panes-container.theme-sepia ::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
}
.panes-container.theme-sepia ::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}

.panes-container.theme-light {
    background-color: #f8fafc;
}
.panes-container.theme-light .pane-left {
    border-right-color: #e2e8f0;
}
.panes-container.theme-light .pane-title {
    background: rgba(0, 0, 0, 0.02);
    color: #64748b;
    border-bottom-color: #e2e8f0;
}
.panes-container.theme-light .pane-content,
.panes-container.theme-light .translation-editor {
    color: #0f172a;
    background-color: transparent;
}
.panes-container.theme-light ::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.08);
}
.panes-container.theme-light ::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.18);
}

/* Font Styles dynamic classes */
.pane-content.font-sans, .translation-editor.font-sans {
    font-family: var(--font-en), var(--font-th) !important;
}
.pane-content.font-serif, .translation-editor.font-serif {
    font-family: 'Lora', 'Georgia', 'Sarabun', serif !important;
}