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

:root {
    --primary: hsl(260, 85%, 60%);
    --primary-light: hsl(260, 85%, 70%);
    --primary-dark: hsl(260, 85%, 50%);
    --secondary: hsl(200, 90%, 55%);
    --accent: hsl(320, 85%, 60%);
    --success: hsl(145, 70%, 50%);
    --error: hsl(0, 85%, 60%);
    
    --bg-dark: hsl(240, 15%, 8%);
    --bg-card: hsl(240, 12%, 12%);
    --bg-card-hover: hsl(240, 12%, 15%);
    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(0, 0%, 70%);
    --border: hsl(240, 10%, 20%);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(160, 100, 255, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, hsl(260, 20%, 12%) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.header-content {
    position: relative;
    z-index: 1;
}

.title {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon {
    font-size: clamp(32px, 5vw, 48px);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.subtitle {
    font-size: clamp(14px, 2.5vw, 18px);
    opacity: 0.95;
    font-weight: 400;
}

/* Controls */
.controls {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(160, 100, 255, 0.2);
}

.search-icon {
    padding: 0 16px;
    font-size: 20px;
}

#searchInput {
    flex: 1;
    padding: 16px 16px 16px 0;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    outline: none;
}

#searchInput::placeholder {
    color: var(--text-secondary);
}

/* Sheet Tabs */
.sheet-tabs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.sheet-tab {
    padding: 12px 24px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 14px;
}

.sheet-tab:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary-light);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.sheet-tab.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-color: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
}

/* Content */
.content {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    min-height: 400px;
    box-shadow: var(--shadow-md);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    gap: 20px;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-state p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* Error State */
.error-state {
    text-align: center;
    padding: 60px 20px;
}

.error-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.error-state h3 {
    font-size: 24px;
    margin-bottom: 12px;
    color: var(--error);
}

.error-state p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.hint {
    background: var(--bg-dark);
    padding: 16px;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary);
    margin: 20px 0;
    font-size: 14px;
}

.retry-btn {
    margin-top: 24px;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Table */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
}

#dataTable {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

#dataTable thead {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    position: sticky;
    top: 0;
    z-index: 10;
}

#dataTable th {
    padding: 16px;
    text-align: left;
    font-weight: 600;
    color: white;
    white-space: nowrap;
}

#dataTable tbody tr {
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

#dataTable tbody tr:hover {
    background: var(--bg-card-hover);
}

#dataTable td {
    padding: 16px;
    color: var(--text-primary);
}

#dataTable tbody tr:last-child {
    border-bottom: none;
}

/* No Results */
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 18px;
}

/* Footer */
.footer {
    margin-top: 32px;
    padding: 24px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .header {
        padding: 28px 20px;
        margin-bottom: 20px;
    }
    
    .content {
        padding: 20px;
    }
    
    .table-wrapper {
        margin: -20px;
        padding: 20px;
    }
    
    #dataTable {
        font-size: 13px;
    }
    
    #dataTable th,
    #dataTable td {
        padding: 12px 8px;
    }
    
    .sheet-tabs {
        gap: 8px;
    }
    
    .sheet-tab {
        padding: 10px 16px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    #dataTable {
        font-size: 12px;
    }
    
    #dataTable th,
    #dataTable td {
        padding: 10px 6px;
    }
}