/* ===== CSS Variables ===== */
:root {
    /* Brand Colors */
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-darker: #1D4ED8;
    --color-accent: #512BD4;
    --color-accent-light: #6A3AFF;

    /* Backgrounds */
    --bg-body: #F5F7FA;
    --bg-card: #FFFFFF;
    --bg-sidebar: #1E293B;
    --bg-sidebar-hover: rgba(255, 255, 255, 0.08);
    --bg-sidebar-active: rgba(59, 130, 246, 0.2);

    /* Text */
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --text-on-dark: #F1F5F9;
    --text-on-dark-muted: #94A3B8;

    /* Borders */
    --border-color: #E2E8F0;
    --border-radius: 8px;

    /* 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);

    /* Spacing */
    --sidebar-width: 260px;
    --topbar-height: 56px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ===== Dark Theme ===== */
[data-theme="dark"] {
    /* Backgrounds */
    --bg-body: #0F172A;
    --bg-card: #1E293B;
    --bg-sidebar: #0B1120;
    --bg-sidebar-hover: rgba(255, 255, 255, 0.06);
    --bg-sidebar-active: rgba(59, 130, 246, 0.25);

    /* Text */
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #8892A4;

    /* Borders */
    --border-color: #334155;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);

    color-scheme: dark;
}

[data-theme="dark"] .btn-danger-outline {
    color: #F87171;
    border-color: #7F1D1D;
}

[data-theme="dark"] .btn-danger-outline:hover {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: #DC2626;
}

[data-theme="dark"] .form-control:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

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

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

h1:focus {
    outline: none;
}

p {
    margin-top: 0;
    color: var(--text-secondary);
}

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

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

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

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

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

.btn-danger {
    color: #fff;
    background-color: #DC2626;
    border-color: #DC2626;
}

.btn-danger:hover {
    background-color: #B91C1C;
    border-color: #B91C1C;
}

.btn-danger-outline {
    color: #DC2626;
    background-color: transparent;
    border-color: #FECACA;
}

.btn-danger-outline:hover {
    background-color: #FEF2F2;
    border-color: #DC2626;
}

.btn-success {
    color: #fff;
    background-color: #22C55E;
    border-color: #22C55E;
}

.btn-success:hover {
    background-color: #16A34A;
    border-color: #16A34A;
}

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

.btn-link {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0;
}

.btn-link:hover {
    text-decoration: underline;
    color: var(--color-primary-dark);
}

.btn:disabled, .btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
}

/* ===== Forms ===== */
.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-label {
    display: block;
    margin-bottom: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ===== Validation ===== */
.valid.modified:not([type=checkbox]) {
    outline: 1px solid #22C55E;
}

.invalid {
    outline: 1px solid #EF4444;
}

.validation-message {
    color: #EF4444;
    font-size: 0.8125rem;
    margin-top: 0.25rem;
}

/* ===== Blazor Error UI ===== */
#blazor-error-ui {
    color-scheme: light only;
    background: #FEF2F2;
    border-top: 2px solid #EF4444;
    bottom: 0;
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.75rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    color: #991B1B;
}

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

.blazor-error-boundary {
    background: #EF4444;
    padding: 1rem;
    color: white;
    border-radius: var(--border-radius);
}

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

/* ===== Loading Progress ===== */
.loading-progress {
    position: absolute;
    display: block;
    width: 8rem;
    height: 8rem;
    inset: 20vh 0 auto 0;
    margin: 0 auto;
}

.loading-progress circle {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 0.6rem;
    transform-origin: 50% 50%;
    transform: rotate(-90deg);
}

.loading-progress circle:last-child {
    stroke: var(--color-primary);
    stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
    transition: stroke-dasharray 0.05s ease-in-out;
}

.loading-progress-text {
    position: absolute;
    text-align: center;
    font-weight: bold;
    inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
    color: var(--text-primary);
}

.loading-progress-text:after {
    content: var(--blazor-load-percentage-text, "Loading");
}

/* ===== Utility Classes ===== */
.text-muted {
    color: var(--text-muted);
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }