/* =============================================
   PDF Office Reader - Web Application Styles
   ============================================= */

/* CSS Variables */
:root {
    --primary-color: #CB1114;
    --primary-hover: #a50e10;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;

    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-color: #1b1b1f;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;

    --header-height: 64px;
    --footer-height: 60px;
    --sidebar-width: 280px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --transition: all 0.2s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-color: #1b1b1f;
    --bg-secondary: #2d2d32;
    --bg-tertiary: #3d3d42;
    --text-color: #ffffff;
    --text-secondary: #adb5bd;
    --border-color: #495057;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
}

/* =============================================
   Header
   ============================================= */
.header {
    background: var(--bg-color);
    height: var(--header-height);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    cursor: pointer;
}

.logo i {
    font-size: 1.5rem;
}

/* Navigation */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-btn:hover {
    background: var(--bg-secondary);
}

.nav-btn .fa-chevron-down {
    font-size: 0.75rem;
    transition: var(--transition);
}

.dropdown:hover .fa-chevron-down {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-color);
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.dropdown-menu a i {
    width: 20px;
    text-align: center;
    color: var(--text-secondary);
}

.dropdown-menu a:hover i {
    color: var(--primary-color);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 50%;
    color: var(--text-color);
    font-size: 1.1rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
}

/* Navigation Toolbar */
.nav-toolbar {
    display: flex;
    align-items: center;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    max-width: calc(100vw - 400px);
}

.nav-toolbar::-webkit-scrollbar {
    display: none;
}

.nav-tool {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.nav-tool:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.nav-tool.active {
    background: var(--primary-color);
    color: white;
}

.nav-tool i {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.nav-tool:hover i {
    color: var(--primary-color);
}

.nav-tool.active i {
    color: white;
}

/* Responsive Toolbar */
@media (max-width: 1200px) {
    .nav-tool span {
        display: none;
    }

    .nav-tool {
        padding: 10px;
    }

    .nav-tool i {
        font-size: 1.1rem;
    }

    .nav-toolbar {
        max-width: calc(100vw - 250px);
    }
}

@media (max-width: 768px) {
    .nav-toolbar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-color);
        border-top: 1px solid var(--border-color);
        padding: 8px 12px;
        justify-content: space-around;
        max-width: 100%;
        z-index: 1000;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    }

    .nav-tool {
        flex-direction: column;
        padding: 6px 8px;
        font-size: 0.7rem;
        gap: 4px;
    }

    .nav-tool span {
        display: block;
    }

    .nav-tool i {
        font-size: 1.2rem;
    }

    .header-container {
        justify-content: space-between;
    }

    body {
        padding-bottom: 70px;
    }
}

@media (max-width: 480px) {
    .nav-toolbar {
        justify-content: flex-start;
        overflow-x: auto;
        padding: 8px;
    }

    .nav-tool span {
        display: none;
    }

    .nav-tool {
        flex-direction: row;
        padding: 10px 12px;
    }
}

/* =============================================
   Main Content
   ============================================= */
.main-content {
    flex: 1;
    margin-top: var(--header-height);
    padding: 24px;
    max-width: 1400px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 12px;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 48px;
}

.tool-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.tool-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.tool-icon i {
    font-size: 1.75rem;
    color: white;
}

.tool-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* =============================================
   My Files Section
   ============================================= */
.my-files-section {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-header h2 i {
    color: var(--primary-color);
}

.file-actions {
    display: flex;
    gap: 12px;
}

.search-input {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-color);
    font-size: 0.9rem;
    min-width: 200px;
}

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

.filter-select {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-color);
    font-size: 0.9rem;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    margin-bottom: 24px;
    transition: var(--transition);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary-color);
    background: rgba(203, 17, 20, 0.05);
}

.upload-zone i {
    font-size: 3rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.upload-zone p {
    color: var(--text-secondary);
}

.upload-label {
    color: var(--primary-color);
    cursor: pointer;
    font-weight: 500;
}

.upload-label:hover {
    text-decoration: underline;
}

/* Files List */
.files-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.file-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    cursor: pointer;
    transition: var(--transition);
}

.file-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.file-item-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}

.file-item-icon i {
    font-size: 1.5rem;
    color: white;
}

.file-item-name {
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-item-info {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.file-item-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.file-item-actions button {
    flex: 1;
    padding: 6px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: var(--transition);
}

.file-item-actions button:hover {
    background: var(--primary-color);
    color: white;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* =============================================
   Tool Sections
   ============================================= */
.tool-section {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    min-height: calc(100vh - var(--header-height) - var(--footer-height) - 48px);
}

.tool-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    font-size: 0.9rem;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--bg-tertiary);
}

.tool-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tool-header h2 i {
    color: var(--primary-color);
}

.tool-content {
    padding: 24px;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    transition: var(--transition);
    max-width: 500px;
    margin: 0 auto;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(203, 17, 20, 0.02);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

/* =============================================
   PDF Viewer
   ============================================= */
.pdf-viewer-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--header-height) - 200px);
}

.viewer-toolbar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toolbar-group button {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    color: var(--text-color);
    transition: var(--transition);
}

.toolbar-group button:hover {
    background: var(--primary-color);
    color: white;
}

.page-info, .zoom-level {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-width: 100px;
    text-align: center;
}

.pdf-canvas-container {
    flex: 1;
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 20px;
}

#pdf-canvas {
    box-shadow: var(--shadow-lg);
    background: white;
}

/* =============================================
   Merge/Split Files List
   ============================================= */
.info-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sortable-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.sortable-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: grab;
}

.sortable-item:active {
    cursor: grabbing;
}

.sortable-item .drag-handle {
    color: var(--text-secondary);
}

.sortable-item .file-name {
    flex: 1;
    font-weight: 500;
}

.sortable-item .file-size {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.sortable-item .remove-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--danger-color);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.sortable-item .remove-btn:hover {
    background: rgba(220, 53, 69, 0.1);
}

.merge-actions, .image-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* =============================================
   Split Options
   ============================================= */
.split-info {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.split-mode-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 10px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    font-size: 0.9rem;
    transition: var(--transition);
}

.tab-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.mode-panel {
    display: none;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.mode-panel.active {
    display: block;
}

.range-inputs {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
}

.range-inputs input {
    width: 100px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-color);
    color: var(--text-color);
}

#pages-input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-color);
    color: var(--text-color);
    margin-top: 12px;
}

.page-preview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.page-thumbnail {
    aspect-ratio: 3/4;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.page-thumbnail.selected {
    border-color: var(--primary-color);
    background: rgba(203, 17, 20, 0.1);
}

.page-thumbnail span {
    font-weight: 500;
}

/* =============================================
   Image Grid
   ============================================= */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.image-item {
    position: relative;
    aspect-ratio: 1;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: grab;
}

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

.image-item .remove-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    border: none;
    background: rgba(220, 53, 69, 0.9);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
}

.image-item:hover .remove-btn {
    opacity: 1;
}

/* PDF Options */
.pdf-options {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.option-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.option-group select {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-color);
    min-width: 150px;
}

/* =============================================
   Text Editor
   ============================================= */
.text-editor {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.text-options {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

#text-content {
    width: 100%;
    min-height: 400px;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
}

#text-content:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* =============================================
   Excel Preview
   ============================================= */
.excel-info {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.excel-table-container {
    max-height: 400px;
    overflow: auto;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.excel-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.excel-table th,
.excel-table td {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.excel-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.excel-table tr:nth-child(even) {
    background: var(--bg-secondary);
}

/* =============================================
   Extract Text
   ============================================= */
.extracted-text-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.extract-actions {
    display: flex;
    gap: 12px;
}

#extracted-text {
    width: 100%;
    min-height: 400px;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
}

/* =============================================
   Password Forms
   ============================================= */
.lock-info, .unlock-info {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.password-form {
    max-width: 400px;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-color);
    font-size: 1rem;
}

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

/* =============================================
   Loading Overlay
   ============================================= */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    background: var(--bg-color);
    padding: 32px 48px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.loading-spinner i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.loading-spinner p {
    color: var(--text-color);
    font-weight: 500;
}

/* =============================================
   Toast Notifications
   ============================================= */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    min-width: 300px;
}

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

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast i {
    font-size: 1.25rem;
}

.toast.success i { color: var(--success-color); }
.toast.error i { color: var(--danger-color); }
.toast.warning i { color: var(--warning-color); }

.toast-message {
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

/* =============================================
   Footer
   ============================================= */
.footer {
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 20px 24px;
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* =============================================
   Responsive Design
   ============================================= */
@media (max-width: 768px) {
    .header-container {
        padding: 0 16px;
    }

    .logo span {
        display: none;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-color);
        border-bottom: 1px solid var(--border-color);
        padding: 16px;
        display: none;
    }

    .nav-menu.open {
        display: block;
    }

    .main-content {
        padding: 16px;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .tool-card {
        padding: 16px;
    }

    .tool-icon {
        width: 48px;
        height: 48px;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .file-actions {
        flex-direction: column;
    }

    .viewer-toolbar {
        flex-direction: column;
        gap: 12px;
    }

    .merge-actions, .image-actions {
        flex-direction: column;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }

    .upload-area {
        padding: 32px 16px;
    }

    .upload-area i {
        font-size: 2.5rem;
    }
}