/* NetQueryBuilder Sample App - Modern Premium Design */

/* ====================================
   CSS Variables & Theme
   ==================================== */
:root {
    /* Premium Color Palette */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-dark: linear-gradient(135deg, #232526 0%, #414345 100%);
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);

    /* Accent Colors */
    --accent-purple: #667eea;
    --accent-pink: #f093fb;
    --accent-blue: #4facfe;
    --accent-cyan: #00f2fe;

    /* Surface Colors */
    --surface-elevated: #ffffff;
    --surface-default: #f8fafc;
    --surface-muted: #f1f5f9;

    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
    --shadow-card-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.15);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ====================================
   Base Styles
   ==================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--surface-default);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ====================================
   Header - Hero Section
   ==================================== */
.nqb-header {
    background: var(--gradient-hero);
    color: var(--text-inverse);
    padding: var(--space-16) 0 var(--space-12);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Animated background effect */
.nqb-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(240, 147, 251, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(79, 172, 254, 0.15) 0%, transparent 40%);
    animation: headerGlow 8s ease-in-out infinite alternate;
}

@keyframes headerGlow {
    0% { opacity: 0.5; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.1); }
}

/* Floating particles */
.nqb-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.2), transparent),
        radial-gradient(2px 2px at 50px 160px, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 90px 40px, rgba(255,255,255,0.2), transparent),
        radial-gradient(2px 2px at 130px 80px, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 160px 120px, rgba(255,255,255,0.2), transparent);
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: particleFloat 20s linear infinite;
    pointer-events: none;
}

@keyframes particleFloat {
    0% { transform: translateY(0); }
    100% { transform: translateY(-200px); }
}

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

.nqb-header h1 {
    margin: 0;
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.2);
}

.nqb-header p {
    margin: var(--space-3) 0 0;
    font-size: 1.25rem;
    font-weight: 400;
    opacity: 0.85;
    letter-spacing: 0.01em;
}

/* Badge in header */
.nqb-header-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
    padding: var(--space-2) var(--space-4);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nqb-header-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

/* ====================================
   Main Content Area
   ==================================== */
main {
    padding: var(--space-12) var(--space-4);
    min-height: calc(100vh - 400px);
}

main > .nqb-container {
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 1200px) {
    main {
        padding: var(--space-12) var(--space-8);
    }
}

@media (max-width: 768px) {
    main {
        padding: var(--space-6) var(--space-4);
    }

    main > .nqb-container {
        max-width: 100%;
    }
}

/* ====================================
   Page Title & Subtitle
   ==================================== */
.nqb-container > h1:first-of-type {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-2);
    letter-spacing: -0.02em;
}

.nqb-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin: 0 0 var(--space-10);
    font-weight: 400;
}

/* ====================================
   Cards - Glassmorphism Style
   ==================================== */
.nqb-card {
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-8);
    margin-bottom: var(--space-6);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    transition: all var(--transition-normal);
}

.nqb-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.nqb-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.nqb-card:hover::before {
    opacity: 1;
}

/* Card Headers with Step Numbers */
.nqb-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Step Number Badge */
.nqb-card h2::before {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    color: white;
    font-size: 0.875rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.nqb-card:nth-of-type(1) h2::before { content: '1'; }
.nqb-card:nth-of-type(2) h2::before { content: '2'; }
.nqb-card:nth-of-type(3) h2::before { content: '3'; }
.nqb-card:nth-of-type(4) h2::before { content: '4'; }
.nqb-card:nth-of-type(5) h2::before { content: '5'; }
.nqb-card:nth-of-type(6) h2::before { content: '6'; }

/* Results card shouldn't have step number */
.nqb-card:has(.nqb-table-container) h2::before,
.nqb-card:has(.nqb-expression-display) h2::before {
    display: none;
}

/* ====================================
   Buttons - Premium Style
   ==================================== */
.nqb-button {
    font-family: inherit;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.nqb-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.nqb-button:hover::before {
    left: 100%;
}

.nqb-button-primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.4);
}

.nqb-button-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.nqb-button-primary:active {
    transform: translateY(0);
}

.nqb-button-large {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
    min-width: 160px;
}

.nqb-button-outlined {
    background: transparent;
    border: 2px solid var(--accent-purple);
    color: var(--accent-purple);
}

.nqb-button-outlined:hover {
    background: rgba(102, 126, 234, 0.08);
    border-color: var(--accent-purple);
}

/* Action Buttons Container */
.nqb-actions {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--surface-muted);
    flex-wrap: wrap;
}

/* ====================================
   Alerts - Modern Style
   ==================================== */
.nqb-alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nqb-alert-error {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border: 1px solid #fecaca;
    color: #991b1b;
}

.nqb-alert-error::before {
    content: '!';
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: #ef4444;
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    border-radius: 50%;
    flex-shrink: 0;
}

.nqb-alert p {
    margin: 0;
    font-size: 0.9375rem;
}

/* ====================================
   Expression Display - Code Block
   ==================================== */
.nqb-expression-display {
    position: relative;
}

.nqb-expression-display h4,
.nqb-subsection-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0 0 var(--space-3);
}

.nqb-code {
    background: var(--gradient-dark);
    color: #e2e8f0;
    padding: var(--space-5);
    border-radius: var(--radius-md);
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, Monaco, monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    overflow-x: auto;
    margin: 0;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
    position: relative;
}

.nqb-code::before {
    content: 'LINQ Expression';
    position: absolute;
    top: var(--space-2);
    right: var(--space-3);
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.4);
    font-family: inherit;
}

.nqb-code code {
    color: #a5f3fc;
}

/* ====================================
   Tables - Modern Data Display
   ==================================== */
.nqb-table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--surface-muted);
}

.nqb-table {
    border-collapse: separate;
    border-spacing: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.nqb-table th {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    padding: var(--space-4) var(--space-5);
    border-bottom: 2px solid var(--surface-muted);
    position: sticky;
    top: 0;
}

.nqb-table td {
    padding: var(--space-4) var(--space-5);
    font-size: 0.9375rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--surface-muted);
    transition: background-color var(--transition-fast);
}

.nqb-table-striped tbody tr:nth-of-type(even) {
    background-color: rgba(248, 250, 252, 0.5);
}

.nqb-table-hover tbody tr {
    transition: all var(--transition-fast);
}

.nqb-table-hover tbody tr:hover {
    background-color: rgba(102, 126, 234, 0.06);
    transform: scale(1.002);
}

.nqb-table-hover tbody tr:hover td {
    color: var(--accent-purple);
}

/* ====================================
   Pagination - Clean Design
   ==================================== */
.nqb-pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    background: var(--surface-muted);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    margin-top: -1px;
}

.nqb-pagination-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.nqb-pagination .nqb-button-small {
    padding: var(--space-2) var(--space-4);
    font-size: 0.8125rem;
}

.nqb-pagination .nqb-button-outlined:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

/* ====================================
   Info Messages
   ==================================== */
.nqb-info-message {
    text-align: center;
    padding: var(--space-12) var(--space-8);
    color: var(--text-secondary);
    font-size: 1rem;
}

.nqb-info-message::before {
    content: '';
    display: block;
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-4);
    background: var(--surface-muted);
    border-radius: var(--radius-full);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 32px;
}

/* ====================================
   Footer - Clean & Minimal
   ==================================== */
.nqb-footer {
    background: var(--surface-elevated);
    padding: var(--space-8) 0;
    text-align: center;
    margin-top: var(--space-16);
    border-top: 1px solid var(--surface-muted);
}

.nqb-footer p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.nqb-footer a {
    color: var(--accent-purple);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nqb-footer a:hover {
    color: var(--accent-pink);
}

/* ====================================
   Form Controls Enhancement
   ==================================== */
.nqb-form-control,
.nqb-textfield,
.nqb-select {
    margin-bottom: var(--space-5);
}

.nqb-label,
.nqb-textfield-label,
.nqb-select-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
}

.nqb-input,
.nqb-textfield-input,
.nqb-select-input {
    border: 2px solid var(--surface-muted);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
    background: var(--surface-elevated);
}

.nqb-input:focus,
.nqb-textfield-input:focus,
.nqb-select-input:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
    outline: none;
}

/* ====================================
   Block Condition Styling
   ==================================== */
.nqb-block-condition {
    background: var(--surface-elevated);
    border: 2px solid var(--surface-muted);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    transition: border-color var(--transition-fast);
}

.nqb-block-condition:hover {
    border-color: rgba(102, 126, 234, 0.3);
}

.nqb-block-header {
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
    border-bottom: 1px dashed var(--surface-muted);
}

.nqb-simple-condition {
    background: var(--surface-muted);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    transition: all var(--transition-fast);
}

.nqb-simple-condition:hover {
    background: rgba(102, 126, 234, 0.08);
}

/* ====================================
   Chip Enhancement
   ==================================== */
.nqb-chip {
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nqb-chip:hover {
    transform: scale(1.05);
}

.nqb-chip-primary {
    background: var(--gradient-primary);
}

/* ====================================
   Loading State
   ==================================== */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.nqb-loading {
    background: linear-gradient(90deg, var(--surface-muted) 25%, var(--surface-default) 50%, var(--surface-muted) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

/* ====================================
   Responsive Design
   ==================================== */
@media (max-width: 768px) {
    .nqb-header {
        padding: var(--space-10) 0 var(--space-8);
    }

    .nqb-header h1 {
        font-size: 2.25rem;
    }

    .nqb-header p {
        font-size: 1rem;
    }

    main {
        padding: var(--space-6) 0;
    }

    .nqb-card {
        padding: var(--space-5);
        margin-bottom: var(--space-4);
    }

    .nqb-card h2 {
        font-size: 1.125rem;
    }

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

    .nqb-button-large {
        width: 100%;
        justify-content: center;
    }

    .nqb-pagination {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }

    .nqb-table th,
    .nqb-table td {
        padding: var(--space-3);
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .nqb-header h1 {
        font-size: 1.75rem;
    }

    .nqb-container > h1:first-of-type {
        font-size: 1.5rem;
    }

    .nqb-subtitle {
        font-size: 1rem;
    }
}

/* ====================================
   Print Styles
   ==================================== */
@media print {
    .nqb-header::before,
    .nqb-header::after,
    .nqb-actions,
    .nqb-pagination {
        display: none;
    }

    .nqb-header {
        background: #1a1a2e;
        padding: var(--space-4) 0;
    }

    .nqb-card {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
}

/* ====================================
   Accessibility
   ==================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-purple);
    color: white;
    padding: var(--space-3) var(--space-6);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}