:root {
    --ns-bg: #000000;
    --ns-bg-alt: #0a0a0a;
    --ns-primary: #EF3501;
    --ns-primary-hover: #d42f00;
    --ns-secondary: #CF8E01;
    --ns-accent: #D9A428;
    --ns-accent-light: #E8BC3A;
    --ns-text: #F7F8F6;
    --ns-text-muted: rgba(229, 236, 246, 0.66);
    --ns-card-bg: rgba(255, 255, 255, 0.03);
    --ns-card-border: rgba(255, 255, 255, 0.08);
    --ns-card-hover: rgba(255, 255, 255, 0.06);
    --ns-input-bg: rgba(255, 255, 255, 0.05);
    --ns-input-border: rgba(255, 255, 255, 0.1);
    --ns-ucl: #EF3501;
    --ns-lcl: #EF3501;
    --ns-cl: #CF8E01;
    --ns-data: #10B981;
    --ns-outlier: #D9A428;
    --ns-excluded: #6B7280;
    --ns-glow: rgba(239, 53, 1, 0.15);
    --ns-gradient: linear-gradient(135deg, var(--ns-primary) 0%, var(--ns-accent) 100%);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="light"] {
    --ns-bg: #ffffff;
    --ns-bg-alt: #fafafa;
    --ns-text: #0a0a0a;
    --ns-text-muted: black;
    --ns-card-bg: rgba(0, 0, 0, 0.02);
    --ns-card-border: rgba(0, 0, 0, 0.08);
    --ns-card-hover: rgba(0, 0, 0, 0.04);
    --ns-input-bg: rgba(0, 0, 0, 0.03);
    --ns-input-border: rgba(0, 0, 0, 0.12);
    --ns-glow: rgba(239, 53, 1, 0.1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--ns-bg);
    color: var(--ns-text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.navbar {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--ns-card-border);
    padding: 0.75rem 0;
    transition: background-color 0.3s ease;
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-icon svg {
    width: 100%;
    height: 100%;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ns-text);
    letter-spacing: -0.02em;
}

.brand-text .brand-sub {
    font-weight: 400;
    color: var(--ns-text-muted);
}

.btn-theme {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--ns-card-bg);
    border: 1px solid var(--ns-card-border);
    color: var(--ns-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.2s ease;
}

.btn-theme:hover {
    background: var(--ns-card-hover);
    border-color: var(--ns-primary);
    color: var(--ns-primary);
}

.main-content {
    padding-top: 80px;
    padding-bottom: 60px;
    min-height: calc(100vh - 60px);
}

.hero {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    color: var(--ns-text);
}

.hero-title span {
    background: var(--ns-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--ns-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: var(--ns-card-bg);
    border: 1px solid var(--ns-card-border);
    border-radius: 16px;
    backdrop-filter: blur(8px);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    background: var(--ns-card-hover);
    border-color: rgba(239, 53, 1, 0.3);
    box-shadow: 0 0 40px var(--ns-glow);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--ns-card-border);
    padding: 1rem 1.25rem;
    font-weight: 600;
    color: var(--ns-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header i {
    color: var(--ns-primary);
}

.card-body {
    padding: 1.25rem;
}

.file-upload-area {
    border: 2px dashed var(--ns-card-border);
    border-radius: 12px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--ns-input-bg);
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--ns-primary);
    background: rgba(239, 53, 1, 0.05);
}

.file-upload-area i {
    font-size: 2.5rem;
    color: var(--ns-text-muted);
    margin-bottom: 0.75rem;
}

.file-upload-area p {
    margin: 0;
    color: var(--ns-text-muted);
}

.form-label {
    font-weight: 500;
    color: var(--ns-text);
    margin-bottom: 0.5rem;
}

.form-control {
    background: var(--ns-input-bg);
    border: 1px solid var(--ns-input-border);
    border-radius: 10px;
    color: var(--ns-text);
    padding: 0.75rem 1rem;
    transition: all 0.2s ease;
}

.form-control:focus {
    background: var(--ns-input-bg);
    border-color: var(--ns-primary);
    box-shadow: 0 0 0 3px rgba(239, 53, 1, 0.15);
    color: var(--ns-text);
}

.form-control::placeholder {
    color: var(--ns-text-muted);
}

.form-check-input {
    background-color: var(--ns-input-bg);
    border-color: var(--ns-input-border);
}

.form-check-input:checked {
    background-color: var(--ns-primary);
    border-color: var(--ns-primary);
}

.form-check-input:focus {
    box-shadow: 0 0 0 3px rgba(239, 53, 1, 0.15);
}

.btn {
    font-weight: 500;
    border-radius: 10px;
    padding: 0.625rem 1.25rem;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--ns-gradient);
    border: none;
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(239, 53, 1, 0.35);
}

.btn-outline-secondary {
    border: 1px solid var(--ns-card-border);
    color: var(--ns-text-muted);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--ns-card-bg);
    border-color: var(--ns-card-border);
    color: var(--ns-text);
}

.btn-outline-primary {
    border: 1px solid var(--ns-primary);
    color: var(--ns-primary);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--ns-primary);
    color: white;
}

.chart-container {
    position: relative;
    height: 280px;
    width: 100%;
}

.stats-panel {
    background: var(--ns-input-bg);
    border-radius: 12px;
    padding: 1rem;
    border: 1px solid var(--ns-card-border);
}

.stats-panel h6 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ns-text-muted);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--ns-card-border);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--ns-text-muted);
}

.stat-value {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--ns-text);
}

.stat-value.ucl,
.stat-value.lcl {
    color: var(--ns-primary);
}

.stat-value.cl {
    color: var(--ns-secondary);
}

.outliers-list {
    max-height: 240px;
    overflow-y: auto;
}

.outliers-list::-webkit-scrollbar {
    width: 6px;
}

.outliers-list::-webkit-scrollbar-track {
    background: transparent;
}

.outliers-list::-webkit-scrollbar-thumb {
    background: var(--ns-card-border);
    border-radius: 3px;
}

.outlier-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: rgba(217, 164, 40, 0.12);
    border-radius: 8px;
    border-left: 3px solid var(--ns-outlier);
    font-size: 0.875rem;
}

.outlier-item.excluded {
    background: var(--ns-input-bg);
    border-left-color: var(--ns-excluded);
    color: var(--ns-text-muted);
}

.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
    border-radius: 6px;
}

.bg-primary-subtle {
    background: rgba(239, 53, 1, 0.12) !important;
}

.text-primary {
    color: var(--ns-primary) !important;
}

.text-muted {
    color: var(--ns-text-muted) !important;
}

.text-warning {
    color: var(--ns-outlier) !important;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.25rem 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--ns-card-border);
}

.divider span {
    padding: 0 1rem;
    color: var(--ns-text-muted);
    font-size: 0.875rem;
}

.placeholder-section {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--ns-text-muted);
}

.placeholder-section i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.placeholder-section p {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.placeholder-section small {
    font-size: 0.875rem;
}

.alert {
    border-radius: 12px;
    border: 1px solid var(--ns-card-border);
    background: var(--ns-card-bg);
}

.alert-info {
    color: var(--ns-text);
    border-left: 3px solid var(--ns-primary);
}

.alert i {
    color: var(--ns-primary);
}

.modal-content {
    background: var(--ns-bg-alt);
    border: 1px solid var(--ns-card-border);
    border-radius: 16px;
}

.modal-header {
    border-bottom: 1px solid var(--ns-card-border);
    padding: 1.25rem;
}

.modal-title {
    font-weight: 600;
    color: var(--ns-text);
}

.modal-body {
    padding: 1.25rem;
}

.modal-footer {
    border-top: 1px solid var(--ns-card-border);
    padding: 1rem 1.25rem;
}

.btn-close-white {
    filter: invert(1) grayscale(100%) brightness(200%);
}

[data-theme="light"] .btn-close-white {
    filter: none;
}

.footer {
    background: var(--ns-bg-alt);
    border-top: 1px solid var(--ns-card-border);
    padding: 1rem 0;
    font-size: 0.875rem;
}

.footer a {
    color: var(--ns-primary);
    text-decoration: none;
    font-weight: 500;
}

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

.form-switch .form-check-input {
    width: 2.5em;
    height: 1.25em;
}

.form-switch .form-check-input:checked {
    background-color: var(--ns-primary);
}

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

.card {
    animation: fadeIn 0.3s ease;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .chart-container {
        height: 240px;
    }
}