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

:root {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --text-primary: #ffffff;
    --text-secondary: #a8a8b3;
    --purple: #a855f7;
    --pink: #ec4899;
    --blue: #3b82f6;
    --cyan: #06b6d4;
    --green: #10b981;
    --orange: #f97316;
    --yellow: #fbbf24;
    --red: #ef4444;
    --card-bg: #16213e;
    --border: rgba(168, 85, 247, 0.2);
    --theme-primary: #a855f7;
    --theme-secondary: #ec4899;
}

body.theme-light {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --card-bg: #ffffff;
    --border: rgba(168, 85, 247, 0.15);
    --theme-primary: #a855f7;
    --theme-secondary: #ec4899;
}

body.theme-red {
    --bg-primary: #1a0a0a;
    --bg-secondary: #2d1212;
    --text-primary: #ffffff;
    --text-secondary: #ffb3b3;
    --card-bg: #3d1a1a;
    --border: rgba(239, 68, 68, 0.3);
    --theme-primary: #ef4444;
    --theme-secondary: #dc2626;
}

body.theme-blue {
    --bg-primary: #0a1628;
    --bg-secondary: #0f2744;
    --text-primary: #ffffff;
    --text-secondary: #93c5fd;
    --card-bg: #1e3a5f;
    --border: rgba(59, 130, 246, 0.3);
    --theme-primary: #3b82f6;
    --theme-secondary: #2563eb;
}

body.theme-green {
    --bg-primary: #0a1f14;
    --bg-secondary: #0f2e1f;
    --text-primary: #ffffff;
    --text-secondary: #86efac;
    --card-bg: #1a3d2a;
    --border: rgba(16, 185, 129, 0.3);
    --theme-primary: #10b981;
    --theme-secondary: #059669;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.5s ease, color 0.5s ease;
}

.welcome-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(45deg, var(--bg-primary), var(--bg-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.8s ease;
    overflow: hidden;
}

.welcome-screen::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        45deg,
        var(--theme-primary) 0%,
        var(--theme-secondary) 25%,
        var(--purple) 50%,
        var(--pink) 75%,
        var(--theme-primary) 100%
    );
    background-size: 400% 400%;
    opacity: 0.15;
    animation: gradientFlow 15s ease infinite;
}

.welcome-screen::after {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 50%, var(--theme-primary) 0%, transparent 25%),
        radial-gradient(circle at 80% 80%, var(--theme-secondary) 0%, transparent 25%),
        radial-gradient(circle at 40% 20%, var(--purple) 0%, transparent 25%),
        radial-gradient(circle at 60% 90%, var(--pink) 0%, transparent 25%);
    opacity: 0.1;
    animation: rotate 30s linear infinite;
}

@keyframes gradientFlow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.welcome-screen.hide {
    animation: fadeOut 0.8s ease forwards;
}

@keyframes fadeOut {
    to { 
        opacity: 0;
        visibility: hidden;
    }
}

.welcome-content {
    text-align: center;
    animation: slideUp 1s ease;
    position: relative;
    z-index: 1;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-title {
    font-size: 64px;
    font-weight: 900;
    letter-spacing: -3px;
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.welcome-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 6px;
    background: linear-gradient(90deg, transparent, var(--theme-primary), var(--theme-secondary), transparent);
    border-radius: 3px;
    animation: pulse-width 2s ease-in-out infinite;
}

@keyframes pulse-width {
    0%, 100% { width: 80%; opacity: 0.5; }
    50% { width: 100%; opacity: 1; }
}

.welcome-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-weight: 300;
    letter-spacing: 0.5px;
}

.enter-btn {
    background: linear-gradient(135deg, var(--theme-primary), var(--theme-secondary));
    border: none;
    border-radius: 50px;
    padding: 20px 56px;
    color: white;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 16px;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

.enter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s;
}

.enter-btn:hover::before {
    left: 100%;
}

.enter-btn:hover {
    transform: translateY(-6px) scale(1.08);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.enter-btn:active {
    transform: translateY(-3px) scale(1.05);
}

.enter-icon {
    font-size: 28px;
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.enter-btn:hover .enter-icon {
    transform: translateX(12px) rotate(45deg);
}

.main-app {
    animation: fadeIn 0.8s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
}

.logo {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -2px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--purple) 0%, var(--pink) 50%, var(--orange) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { filter: hue-rotate(0deg); }
    50% { filter: hue-rotate(20deg); }
}

.tagline {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.theme-toggle {
    background: linear-gradient(135deg, var(--theme-primary), var(--theme-secondary));
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(180deg);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.5);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    position: absolute;
}

.filter-section {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 32px 0;
}

.filter-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    align-items: end;
}

.filter-group label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.filter-group input,
.filter-group select {
    width: 100%;
    padding: 14px 16px;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s;
    outline: none;
}

.custom-select {
    position: relative;
    width: 100%;
}

.select-trigger {
    width: 100%;
    padding: 14px 16px;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s;
}

.select-trigger:hover {
    border-color: var(--purple);
    background-color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(168, 85, 247, 0.2);
}

.custom-select.active .select-trigger {
    border-color: var(--purple);
    box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.1);
}

.custom-select.active .select-trigger svg {
    transform: rotate(180deg);
}

.select-trigger svg {
    transition: transform 0.3s;
    opacity: 0.7;
}

.select-options {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 2px solid var(--purple);
    border-radius: 12px;
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    box-shadow: 0 12px 48px rgba(168, 85, 247, 0.3);
}

.custom-select.active .select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.select-option {
    padding: 14px 16px;
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 1px solid var(--border);
}

.select-option:last-child {
    border-bottom: none;
}

.select-option:hover {
    background: var(--bg-primary);
    color: var(--purple);
    padding-left: 24px;
}

.select-option.selected {
    background: var(--purple);
    color: white;
}

.filter-group input:focus {
    border-color: var(--purple);
    box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.1);
    transform: translateY(-2px);
}

.generate-btn {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--purple), var(--pink));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s;
    box-shadow: 0 8px 32px rgba(168, 85, 247, 0.3);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 48px rgba(168, 85, 247, 0.5);
}

.generate-btn:active {
    transform: translateY(0);
}

.main-content {
    padding: 48px 0;
    min-height: 60vh;
}

.loading-state,
.empty-state,
.error-state {
    text-align: center;
    padding: 80px 20px;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border);
    border-top-color: var(--purple);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 0.8s linear infinite;
}

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

.empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.user-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 24px;
}

.user-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.user-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--purple), var(--pink), var(--orange), var(--cyan));
    background-size: 200% 100%;
    animation: gradient-move 3s linear infinite;
}

@keyframes gradient-move {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.user-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(168, 85, 247, 0.3);
    border-color: var(--purple);
}

.user-header {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
}

.user-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 3px solid var(--purple);
    object-fit: cover;
    box-shadow: 0 8px 24px rgba(168, 85, 247, 0.4);
}

.user-avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--purple), var(--pink));
    color: white;
    font-size: 24px;
    font-weight: 700;
    text-transform: uppercase;
}

.select-divider {
    padding: 10px 16px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    background: var(--bg-primary);
    text-align: center;
    cursor: default;
    border-bottom: 1px solid var(--border);
}

.user-info h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
    background: linear-gradient(135deg, var(--purple), var(--pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.user-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--purple);
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: capitalize;
    margin-top: 4px;
}

.user-details {
    display: grid;
    gap: 16px;
}

.detail-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.detail-item {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.detail-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.detail-label.email { color: var(--cyan); }
.detail-label.phone { color: var(--green); }
.detail-label.location { color: var(--orange); }
.detail-label.age { color: var(--pink); }
.detail-label.username { color: var(--purple); }
.detail-label.id { color: var(--yellow); }

.detail-value {
    font-size: 14px;
    font-weight: 500;
    word-break: break-word;
}

.full-width {
    grid-column: 1 / -1;
}

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

@media (max-width: 768px) {
    .user-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-panel {
        grid-template-columns: 1fr;
    }
    
    .detail-row {
        grid-template-columns: 1fr;
    }
}