/* ========== Design Tokens ========== */
:root {
    /* Primary */
    --color-primary: #3578e5;
    --color-primary-dark: #2b62c2;
    --color-primary-light: #538ce9;
    --color-primary-lightest: #ebf2fc;
    --color-primary-contrast: #ffffff;

    /* Neutrals */
    --color-gray-50: #f8f9fb;
    --color-gray-100: #eef0f4;
    --color-gray-200: #dfe2e8;
    --color-gray-300: #ccd1d9;
    --color-gray-400: #a8aeb8;
    --color-gray-500: #7c8490;
    --color-gray-600: #5c6370;
    --color-gray-700: #3d4350;
    --color-gray-800: #1e2128;

    /* Semantic */
    --color-success: #16a34a;
    --color-success-light: #dcfce7;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-danger: #dc2626;
    --color-danger-light: #fee2e2;
    --color-info: #0ea5e9;
    --color-info-light: #e0f2fe;

    /* Surfaces */
    --color-bg: #f8f9fb;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #1e2128;
    --color-text-secondary: #5c6370;
    --color-text-muted: #9ca3af;
    --color-hover: rgba(0, 0, 0, 0.04);

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.06), 0 4px 10px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.08);

    /* Layout */
    --sidebar-width: 280px;
    --topbar-height: 56px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: 200ms cubic-bezier(0.08, 0.52, 0.52, 1);

    /* Spacing (8px rhythm) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-8: 3rem;
    --space-10: 4rem;
    --space-12: 6rem;
}

/* ========== Dark Mode ========== */
html.dark {
    color-scheme: dark;

    --color-primary: #5b9bf5;
    --color-primary-dark: #7db3f7;
    --color-primary-light: #4a8ae8;
    --color-primary-lightest: rgba(91, 155, 245, 0.12);
    --color-primary-contrast: #ffffff;

    --color-gray-50: #1a1b1e;
    --color-gray-100: #1e2025;
    --color-gray-200: #2e3039;
    --color-gray-300: #3d4150;
    --color-gray-400: #5c6170;
    --color-gray-500: #7c8490;
    --color-gray-600: #9ca3af;
    --color-gray-700: #d1d5db;
    --color-gray-800: #f3f4f6;

    --color-success: #22c55e;
    --color-success-light: rgba(34, 197, 94, 0.15);
    --color-warning: #fbbf24;
    --color-warning-light: rgba(251, 191, 36, 0.15);
    --color-danger: #f87171;
    --color-danger-light: rgba(248, 113, 113, 0.15);
    --color-info: #38bdf8;
    --color-info-light: rgba(56, 189, 248, 0.15);

    --color-bg: #131417;
    --color-surface: #1a1b1e;
    --color-border: #2e3039;
    --color-text: #e5e7eb;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;
    --color-hover: rgba(255, 255, 255, 0.06);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.25), 0 2px 4px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3), 0 4px 10px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.4);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text);
    font-weight: 600;
    line-height: 1.25;
    margin: 0;
}

h1 { font-size: 1.875rem; letter-spacing: -0.025em; }
h2 { font-size: 1.5rem; letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p { margin: 0 0 var(--space-4); }

code {
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
    font-size: 0.875em;
    background: var(--color-gray-100);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    color: var(--color-gray-700);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.5rem 1rem;
    font-weight: 500;
    font-size: 0.875rem;
    line-height: 1.5;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: var(--color-surface);
    color: var(--color-text);
    transition: all var(--transition);
    min-height: 36px;
    white-space: nowrap;
    text-decoration: none;
}

.btn:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-300);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-primary-contrast);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
}

.btn-danger {
    background: var(--color-surface);
    color: var(--color-danger);
    border-color: var(--color-danger);
}

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

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    background: var(--color-hover);
    color: var(--color-text);
}

.btn-sm {
    padding: 0.25rem 0.625rem;
    font-size: 0.8125rem;
    min-height: 30px;
}

.btn-lg {
    padding: 0.625rem 1.5rem;
    font-size: 1rem;
    min-height: 44px;
}

/* ========== Forms ========== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-1);
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-text);
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition), box-shadow var(--transition);
    min-height: 40px;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-lightest);
}

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

select.form-control {
    background: var(--color-surface);
    appearance: auto;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* ========== Tables ========== */
.admin-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--space-5) 0;
    background: var(--color-surface);
}

.admin-table th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-border);
}

.admin-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-gray-100);
    font-size: 0.9rem;
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table tbody tr {
    transition: background var(--transition);
}

.admin-table tbody tr:hover {
    background: var(--color-gray-50);
}

/* ========== Badges ========== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 9999px;
    line-height: 1.5;
}

.badge-primary {
    background: var(--color-primary-lightest);
    color: var(--color-primary);
}

.badge-success {
    background: var(--color-success-light);
    color: var(--color-success);
}

.badge-warning {
    background: var(--color-warning-light);
    color: #92400e;
}

.badge-danger {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

/* ========== Card ========== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    box-shadow: var(--shadow-xs);
}

/* ========== Utilities ========== */
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }

/* ========== Error UI ========== */
.blazor-error-boundary {
    background: var(--color-danger);
    padding: 1rem 1rem 1rem 1.5rem;
    color: white;
    border-radius: var(--radius-md);
    margin: 1rem;
}

.blazor-error-boundary::after {
    content: "An error has occurred."
}

#blazor-error-ui {
    background: #fffbeb;
    bottom: 0;
    box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.1);
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    color: #92400e;
    font-size: 0.875rem;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 0.75rem;
    top: 0.5rem;
}

/* ========== Validation ========== */
.valid.modified:not([type=checkbox]) {
    outline: 2px solid var(--color-success);
    outline-offset: -1px;
}

.invalid {
    outline: 2px solid var(--color-danger);
    outline-offset: -1px;
}

.validation-message {
    color: var(--color-danger);
    font-size: 0.8125rem;
    margin-top: var(--space-1);
}

h1:focus { outline: none; }