/* ============================================
   XLSX Viewer - Styles
   Modern, Clean, and Fully Responsive
   ============================================ */

/* ==================== Color Variables (Easy Customization) ==================== */
:root {
    --primary-color: #2c8462;
    --primary-hover: #237052;
    --background-color: #f0f2f5;
    --card-background: #ffffff;
    --text-primary: #050505;
    --text-secondary: #65676b;
    --border-color: #dddfe2;
    --success-color: #42b72a;
    --error-color: #e4392b;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ==================== Main Container ==================== */
.xlsx-viewer-tool {
    min-height: 100vh;
    padding: 1.5rem 1rem;
    background: var(--background-color);
}

.tool-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ==================== Tool Header ==================== */
.tool-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.tool-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.tool-header h1 i {
    font-size: 1.8rem;
}

.tool-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
    max-width: 700px;
    margin: 0 auto;
}

/* ==================== Upload Section ==================== */
.upload-section {
    margin-bottom: 1.5rem;
}

.upload-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.upload-box {
    max-width: 600px;
    margin: 0 auto;
    padding: 3rem 2rem;
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--background-color);
}

.upload-box:hover {
    border-color: var(--primary-color);
    background: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.upload-box.drag-over {
    border-color: var(--primary-color);
    background: #e8f5f1;
    border-style: solid;
}

.upload-icon {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.upload-info {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #e8f5f1;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--primary-color);
}

.upload-info i {
    font-size: 1rem;
}

/* ==================== Loading Spinner ==================== */
.loading-spinner {
    display: none;
    text-align: center;
    padding: 2rem;
}

.loading-spinner.active {
    display: block;
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 1rem;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

/* ==================== Error Message ==================== */
.error-message {
    display: none;
    max-width: 600px;
    margin: 1.5rem auto 0;
    padding: 1rem 1.5rem;
    background: #fee;
    border: 1px solid var(--error-color);
    border-radius: 8px;
    color: var(--error-color);
    font-size: 0.9rem;
    align-items: center;
    gap: 0.7rem;
}

.error-message.active {
    display: flex;
}

.error-message i {
    font-size: 1.2rem;
}

/* ==================== Viewer Section ==================== */
.viewer-section {
    display: none;
}

.viewer-section.active {
    display: block;
}

/* ==================== Viewer Display Page (Fullscreen) ==================== */
.xlsx-viewer-display-page {
    min-height: 100vh;
    background: var(--background-color);
    padding-bottom: 2rem;
}

.viewer-section-fullscreen {
    max-width: 100%;
    padding: 1.5rem;
}

.viewer-section-fullscreen.active {
    display: block;
}

.viewer-section-fullscreen .viewer-toolbar {
    position: sticky;
    top: 0;
    z-index: 100;
    margin-bottom: 1.5rem;
}

.viewer-section-fullscreen .file-info {
    margin-bottom: 1.5rem;
}

/* ==================== Viewer Toolbar ==================== */
.viewer-toolbar {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.2rem 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    border-bottom: 3px solid var(--primary-color);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.toolbar-btn {
    padding: 0.7rem 1.4rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.back-btn {
    background: #6c757d;
    color: white;
}

.back-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(108, 117, 125, 0.3);
}

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

.download-btn:hover {
    background: #36a420;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(66, 183, 42, 0.4);
}

/* ==================== Sheet Selector ==================== */
.sheet-selector-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sheet-selector-container label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.sheet-selector {
    padding: 0.6rem 2.5rem 0.6rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.sheet-selector:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 6px rgba(44, 132, 98, 0.2);
}

.sheet-selector:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 132, 98, 0.15);
}

/* ==================== Search Box ==================== */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 0.8rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.search-input {
    padding: 0.7rem 0.8rem 0.7rem 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    width: 280px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 132, 98, 0.15);
}

.search-input::placeholder {
    color: #8a8d91;
}

/* ==================== File Info ==================== */
.file-info {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 10px;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
    border-left: 4px solid var(--primary-color);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.info-item i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.info-item span {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1rem;
}

/* ==================== Table Container ==================== */
.table-container {
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow-x: auto;
    position: relative;
    margin-bottom: 2rem;
    border: 1px solid #e5e7eb;
}

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.9rem;
}

.data-table thead {
    background: var(--primary-color);
}

.data-table th {
    padding: 1rem 1.2rem;
    text-align: left;
    font-weight: 700;
    color: white;
    border-bottom: 2px solid var(--primary-hover);
    white-space: nowrap;
    background: var(--primary-color);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.data-table th:first-child {
    text-align: center;
    width: 80px;
    background: var(--primary-hover);
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    transition: background 0.2s ease;
}

.data-table tbody tr:nth-child(even) {
    background: #fafbfc;
}

.data-table tbody tr:nth-child(odd) {
    background: white;
}

.data-table tbody tr:hover {
    background: #e8f5f1;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.data-table tbody tr.hidden {
    display: none;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table td {
    padding: 1rem 1.2rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    word-wrap: break-word;
    max-width: 800px;
}

.data-table td:first-child {
    text-align: center;
    font-weight: 700;
    color: var(--primary-color);
    background: #f0f8f5;
    width: 80px;
    font-size: 0.85rem;
    border-right: 2px solid var(--border-color);
}

.data-table td:empty::before {
    content: '—';
    color: var(--text-secondary);
}

/* ==================== Empty State ==================== */
.empty-state {
    display: none;
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.empty-state.active {
    display: block;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

/* ==================== Features Section ==================== */
.features-section {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    margin-top: 1.5rem;
}

.features-section h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.features-section h3 i {
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.2rem;
}

.feature-card {
    background: var(--background-color);
    padding: 1.2rem;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.8rem;
}

.feature-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==================== Guide Section ==================== */
.guide-section {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.guide-section h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.guide-section h3 i {
    color: var(--primary-color);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.2rem;
}

.guide-step {
    display: flex;
    gap: 1rem;
}

.step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.step-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==================== Related Tools Section ==================== */
.related-tools-section {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.related-tools-header {
    text-align: center;
    margin-bottom: 1.2rem;
}

.related-tools-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.related-tools-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.8rem;
}

.related-tool-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.9rem 1.2rem;
    background: var(--background-color);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.related-tool-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(3px);
}

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

/* ==================== SEO Content Section ==================== */
.seo-content {
    background: var(--card-background);
    margin-top: 2rem;
    padding: 2rem 1rem;
}

.seo-content .container {
    max-width: 1200px;
    margin: 0 auto;
}

.seo-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.seo-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.seo-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
}

.seo-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.seo-content ul,
.seo-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.seo-content li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.seo-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.mb-10 {
    margin-bottom: 2rem;
}

/* ==================== Responsive Design for Mobile ==================== */
@media (max-width: 768px) {
    .xlsx-viewer-tool {
        padding: 1rem 0.8rem;
    }

    .tool-header h1 {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 0.4rem;
    }

    .tool-description {
        font-size: 0.9rem;
    }

    .upload-card {
        padding: 1.5rem;
    }

    .upload-box {
        padding: 2rem 1.5rem;
    }

    .upload-icon {
        font-size: 2.5rem;
    }

    .upload-title {
        font-size: 1.1rem;
    }

    .viewer-toolbar {
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-left,
    .toolbar-right {
        width: 100%;
        flex-direction: column;
        gap: 0.8rem;
    }

    .toolbar-btn {
        width: 100%;
        justify-content: center;
    }

    .search-input {
        width: 100%;
    }

    .file-info {
        flex-direction: column;
        gap: 0.8rem;
        align-items: flex-start;
    }


    .data-table {
        font-size: 0.85rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.8rem 1rem;
    }

    .data-table th:first-child,
    .data-table td:first-child {
        width: 60px;
    }
    
    .search-input {
        width: 100%;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .guide-steps {
        grid-template-columns: 1fr;
    }

    .related-tools-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .tool-header h1 {
        font-size: 1.3rem;
    }

    .upload-box {
        padding: 1.5rem 1rem;
    }

    .upload-title {
        font-size: 1rem;
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.6rem 0.6rem;
    }
}

/* ==================== Print Styles ==================== */
@media print {
    .xlsx-viewer-tool {
        background: white;
    }

    .upload-section,
    .viewer-toolbar,
    .features-section,
    .guide-section,
    .related-tools-section {
        display: none;
    }

    .viewer-section {
        display: block !important;
    }

    .table-container {
        max-height: none;
        overflow: visible;
    }

    .data-table thead {
        position: static;
    }
}