:root {
    /* Material Design 3 - Data Architecture System */
    --primary: #974900;
    --primary-container: #ff7f00;
    --on-primary: #ffffff;
    --on-primary-container: #321200;
    --secondary: #594ebd;
    --secondary-container: #948afd;
    --on-secondary: #ffffff;
    --on-secondary-container: #1a0061;
    --secondary-fixed: #e4dfff;
    --tertiary: #5c5f5f;
    --tertiary-container: #a4a2a2;
    --on-tertiary: #ffffff;
    --surface: #f8f9fa;
    --surface-container-lowest: #ffffff;
    --surface-container-low: #f2f3f4;
    --surface-container: #edeeef;
    --surface-variant: #e1e3e4;
    --on-surface: #191c1d;
    --on-surface-variant: #584235;
    --inverse-surface: #2e3132;
    --inverse-on-surface: #f0f1f2;
    --outline: #8b7263;
    --outline-variant: #dfc0af;
    --error: #ba1a1a;
    --error-container: #ffdad6;
    --success: #006d3b;
    --success-container: #9df6b5;
    --warning: #7c5800;
    --warning-container: #ffdea6;

    --radius: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.06);

    --font-sans: 'Work Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Inter', 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--surface);
    color: var(--on-surface);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1 { font-size: 2rem; font-weight: 600; line-height: 1.2; }
h2 { font-size: 1.5rem; font-weight: 600; line-height: 1.3; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; }
h4 { font-size: 1rem; font-weight: 600; line-height: 1.4; }

.label-md {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

code, .mono { font-family: var(--font-mono); font-size: 0.875rem; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-fluid {
    padding: 0 var(--space-lg);
}

/* Navbar */
.navbar {
    background: var(--surface-container-lowest);
    border-bottom: 1px solid var(--outline-variant);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--primary);
    text-decoration: none;
    font-weight: 900;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.nav-brand .material-symbols-outlined {
    font-size: 1.5rem;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 0;
    height: 100%;
    align-items: stretch;
}

.nav-links a {
    color: var(--on-surface-variant);
    text-decoration: none;
    padding: 0 var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: color 0.2s;
    border-bottom: 2px solid transparent;
    position: relative;
}

.nav-links a .material-symbols-outlined { font-size: 1.1rem; }
.nav-links a:hover { color: var(--on-surface); }
.nav-links a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    color: var(--on-surface-variant);
    cursor: pointer;
    transition: background 0.2s;
}

.nav-icon-btn:hover {
    background: var(--surface-container);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--on-surface);
    cursor: pointer;
}

/* Main */
.main-content { flex: 1; padding: var(--space-xl) 0; }

/* Cards */
.card {
    background: var(--surface-container-lowest);
    border-radius: var(--radius);
    border: 1px solid var(--outline-variant);
    padding: var(--space-lg);
    box-shadow: var(--shadow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--surface-variant);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.card-title .material-symbols-outlined {
    color: var(--primary);
    font-size: 1.25rem;
}

/* Page Header */
.page-header { margin-bottom: var(--space-xl); }
.page-header h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: var(--space-sm); }
.page-header p { color: var(--on-surface-variant); font-size: 0.9375rem; }

/* Grid */
.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-sans);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.15s ease;
    line-height: 1.4;
}

.btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.btn .material-symbols-outlined { font-size: 1.125rem; }

.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: #7a3b00; }

.btn-secondary {
    background: var(--surface-container-lowest);
    color: var(--on-surface);
    border: 1px solid var(--outline-variant);
}
.btn-secondary:hover { background: var(--surface-container-low); }

.btn-accent { background: var(--secondary); color: var(--on-secondary); }
.btn-accent:hover { background: #453ab0; }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #005a30; }

.btn-info { background: var(--secondary); color: var(--on-secondary); }
.btn-info:hover { background: #453ab0; }

.btn-danger { background: var(--error); color: #fff; }
.btn-danger:hover { background: #930012; }

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

/* Forms */
.form-group { margin-bottom: var(--space-md); }
.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-xs);
    color: var(--on-surface-variant);
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    color: var(--on-surface);
    background: var(--surface-container-lowest);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(151, 73, 0, 0.12);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b7263' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

textarea.form-control { resize: vertical; min-height: 80px; }

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--outline-variant);
    border-radius: var(--radius);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(151, 73, 0, 0.04);
}

.upload-zone .material-symbols-outlined {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-data {
    background: rgba(255, 127, 0, 0.12);
    color: var(--primary);
    border: 1px solid rgba(255, 127, 0, 0.25);
}
.badge-viz {
    background: rgba(148, 138, 253, 0.12);
    color: var(--secondary);
    border: 1px solid rgba(148, 138, 253, 0.25);
}
.badge-model {
    background: rgba(92, 95, 95, 0.08);
    color: var(--tertiary);
    border: 1px solid rgba(92, 95, 95, 0.2);
}
.badge-eval {
    background: rgba(124, 88, 0, 0.08);
    color: var(--warning);
    border: 1px solid rgba(124, 88, 0, 0.2);
}
.badge-qual {
    background: rgba(228, 223, 255, 0.5);
    color: var(--secondary);
    border: 1px solid rgba(89, 78, 189, 0.2);
}

/* Table */
.table-wrapper { overflow-x: auto; border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; }
th {
    padding: 0.625rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--on-surface-variant);
    background: var(--surface-container-low);
    border-bottom: 1px solid var(--outline-variant);
}
td {
    padding: 0.625rem 1rem;
    text-align: left;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--surface-variant);
}
tr:nth-child(even) td { background: var(--surface-container-low); }
tr:hover td { background: var(--surface-container); }

/* Wizard Steps */
.wizard-steps {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.wizard-step {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.5rem 1.25rem;
    background: var(--surface-container-lowest);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--on-surface-variant);
    transition: all 0.2s;
}

.wizard-step.active {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

.wizard-step.completed {
    background: var(--surface-container);
    color: var(--on-surface);
    border-color: var(--surface-container);
}

.wizard-step .step-num {
    width: 22px;
    height: 22px;
    border-radius: var(--radius-full);
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6875rem;
    font-weight: 700;
}

.wizard-step.completed .step-num {
    background: var(--success);
    color: #fff;
}

/* Stats */
.stat-card { text-align: center; padding: var(--space-lg); }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--primary); }
.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--on-surface-variant);
    margin-top: var(--space-xs);
}

/* Footer */
.footer {
    background: var(--inverse-surface);
    color: var(--inverse-on-surface);
    padding: var(--space-md) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    opacity: 0.8;
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    border: 1px solid;
}
.alert-info { background: rgba(89, 78, 189, 0.06); color: var(--secondary); border-color: rgba(89, 78, 189, 0.2); }
.alert-success { background: rgba(0, 109, 59, 0.06); color: var(--success); border-color: rgba(0, 109, 59, 0.2); }
.alert-warning { background: rgba(124, 88, 0, 0.06); color: var(--warning); border-color: rgba(124, 88, 0, 0.2); }
.alert-danger { background: rgba(186, 26, 26, 0.06); color: var(--error); border-color: rgba(186, 26, 26, 0.2); }

/* Chart Container */
.chart-container {
    width: 100%;
    min-height: 400px;
    position: relative;
}

/* Responsive */
@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface-container-lowest);
        border-bottom: 1px solid var(--outline-variant);
        flex-direction: column;
        padding: var(--space-md);
    }
    .nav-links.open { display: flex; }
    .nav-links a {
        padding: var(--space-sm) var(--space-md);
        border-bottom: none;
        border-radius: var(--radius);
    }
    .nav-links a.active {
        background: rgba(151, 73, 0, 0.08);
        border-bottom: none;
    }
    .mobile-toggle { display: block; }
    .footer-content { flex-direction: column; gap: var(--space-sm); text-align: center; }
    .wizard-steps { flex-direction: column; align-items: center; }
    .nav-actions { display: none; }
}