/* ===== CSS Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #0ea5e9;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== App Container ===== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 24px;
}

/* ===== Header ===== */
.app-header {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 24px 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    font-size: 40px;
    line-height: 1;
}

.logo-text h1 {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.status-badge {
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-live {
    background: #dcfce7;
    color: #166534;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* ===== Panel Components ===== */
.panel {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(to right, #f8fafc, #ffffff);
}

.panel-icon {
    font-size: 24px;
    line-height: 1;
}

.panel-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.panel-body {
    padding: 24px;
}

/* ===== Upload Area ===== */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--background);
}

.upload-area:hover {
    border-color: var(--primary);
    background: #eff6ff;
}

.upload-area.dragover {
    border-color: var(--primary);
    background: #eff6ff;
    transform: scale(1.01);
}

.upload-icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.upload-icon {
    width: 40px;
    height: 40px;
}

.upload-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.upload-subtext {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.upload-hints {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.hint {
    padding: 6px 12px;
    background: var(--surface);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: #dcfce7;
    border-radius: var(--radius);
    border: 1px solid #86efac;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-icon {
    font-size: 28px;
}

.file-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.file-name {
    font-weight: 600;
    color: #166534;
}

.file-size {
    font-size: 13px;
    color: #15803d;
}

.btn-remove {
    width: 36px;
    height: 36px;
    border: none;
    background: #fee2e2;
    color: var(--error);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.btn-remove:hover {
    background: var(--error);
    color: white;
    transform: rotate(90deg);
}

.btn-remove svg {
    width: 18px;
    height: 18px;
}

.hidden {
    display: none !important;
}

/* ===== Stats Summary ===== */
.stats-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 20px;
}

.stat-card {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 1px solid #bae6fd;
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
}

.stat-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-dark);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== Columns List ===== */
.columns-section {
    margin-top: 20px;
}

.columns-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.column-chip {
    padding: 8px 14px;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition);
}

.column-chip:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== Section Title ===== */
.section-title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ===== Action Section ===== */
.action-section {
    margin-bottom: 24px;
}

.action-section:last-child {
    margin-bottom: 0;
}

.action-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 16px 12px;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.action-btn:hover {
    background: white;
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.action-icon {
    font-size: 24px;
}

.action-text {
    font-size: 13px;
}

/* ===== Form Elements ===== */
.form-select,
.form-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--surface);
    transition: all var(--transition);
    outline: none;
}

.form-select:focus,
.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.filter-controls,
.sort-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sort-direction {
    display: flex;
    gap: 8px;
}

.sort-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border);
    background: var(--background);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all var(--transition);
}

.sort-btn:hover {
    border-color: var(--primary);
}

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

/* ===== Buttons ===== */
.btn-primary,
.btn-secondary {
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-dark), #4338ca);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--surface-hover);
    border-color: var(--text-secondary);
}

/* ===== State Section ===== */
.state-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

.state-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: var(--background);
    border-radius: var(--radius);
    font-size: 13px;
}

.state-label {
    font-weight: 600;
    color: var(--text-primary);
}

.state-value {
    color: var(--text-secondary);
}

/* ===== Table Styles ===== */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

thead {
    background: var(--background);
}

th {
    padding: 12px 14px;
    text-align: left;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

tbody tr:hover {
    background: var(--background);
}

.result-content {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* ===== Results ===== */
.results-panel .panel-header {
    justify-content: space-between;
}

.results-meta {
    display: flex;
    gap: 12px;
    align-items: center;
}

.result-placeholder {
    text-align: center;
    padding: 60px 24px;
}

.placeholder-icon {
    font-size: 56px;
    margin-bottom: 16px;
}

.placeholder-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.placeholder-hint {
    font-size: 14px;
    color: var(--text-tertiary);
}

/* ===== Footer ===== */
.app-footer {
    margin-top: 24px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-lg);
    padding: 20px 32px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-badges {
    display: flex;
    gap: 10px;
}

.badge {
    padding: 6px 12px;
    background: var(--background);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .app-container {
        padding: 16px;
    }
    
    .app-header, .app-footer {
        padding: 16px 20px;
    }
}

@media (max-width: 640px) {
    .logo-text h1 {
        font-size: 22px;
    }
    
    .tagline {
        display: none;
    }
    
    .action-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .stats-summary {
        grid-template-columns: 1fr;
    }
}