/* ===================================================================
   Housekeeping — Premium Dark-Mode Design System
   =================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Custom Properties --- */
:root {
    /* Brand palette — indigo → violet */
    --color-brand-50:  #eef2ff;
    --color-brand-100: #e0e7ff;
    --color-brand-200: #c7d2fe;
    --color-brand-400: #818cf8;
    --color-brand-500: #6366f1;
    --color-brand-600: #4f46e5;
    --color-brand-700: #4338ca;
    --color-violet-400: #a78bfa;
    --color-violet-500: #8b5cf6;

    /* Neutral / surface palette */
    --color-bg:         #0f0f14;
    --color-surface-1:  #16161f;
    --color-surface-2:  #1e1e2a;
    --color-surface-3:  #272736;
    --color-border:     rgba(99, 102, 241, 0.15);
    --color-border-dim: rgba(255, 255, 255, 0.06);

    /* Text */
    --color-text-primary:   #f1f1f8;
    --color-text-secondary: #9494b0;
    --color-text-muted:     #5a5a78;

    /* Semantic */
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-danger:  #f87171;
    --color-info:    #60a5fa;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, var(--color-brand-500) 0%, var(--color-violet-500) 100%);
    --gradient-card:  linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(139,92,246,0.04) 100%);
    --gradient-glow:  radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.25) 0%, transparent 60%);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.5), 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.6), 0 2px 8px rgba(0,0,0,0.4);
    --shadow-brand: 0 4px 20px rgba(99,102,241,0.35);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 64px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* --- App Loading State --- */
.app-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: var(--space-4);
    color: var(--color-text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-brand-500);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* --- Blazor Error UI --- */
#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-surface-2);
    border: 1px solid var(--color-danger);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-5);
    color: var(--color-danger);
    font-size: 0.875rem;
    z-index: 9999;
    box-shadow: var(--shadow-lg);
    gap: var(--space-3);
    align-items: center;
}

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

/* --- Layout --- */
.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--color-surface-1);
    border-right: 1px solid var(--color-border-dim);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-base);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-6) var(--space-6);
    border-bottom: 1px solid var(--color-border-dim);
}

.sidebar-logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-brand);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: var(--shadow-brand);
    flex-shrink: 0;
}

.sidebar-logo-text {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-4) var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    overflow-y: auto;
}

.nav-section-label {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    padding: var(--space-3) var(--space-3) var(--space-1);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background var(--transition-fast), color var(--transition-fast);
    position: relative;
    cursor: pointer;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
}

.nav-item:hover {
    background: var(--color-surface-3);
    color: var(--color-text-primary);
}

.nav-item.active, .nav-item:focus-visible {
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-brand-400);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 25%;
    bottom: 25%;
    width: 3px;
    background: var(--gradient-brand);
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

.nav-icon {
    font-size: 1rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: var(--space-4) var(--space-3);
    border-top: 1px solid var(--color-border-dim);
}

.user-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--color-surface-2);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: var(--space-8);
    max-width: 100%;
    min-height: 100vh;
}

/* --- Page Header --- */
.page-header {
    margin-bottom: var(--space-8);
}

.page-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.page-subtitle {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
}

/* --- Cards --- */
.card {
    background: var(--color-surface-1);
    border: 1px solid var(--color-border-dim);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border-dim);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.card-body {
    padding: var(--space-6);
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--color-surface-1);
    border: 1px solid var(--color-border-dim);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--gradient-brand);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: var(--color-text-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: var(--space-1);
}

/* --- Task Cards --- */
.task-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-4);
}

.task-card {
    background: var(--color-surface-1);
    border: 1px solid var(--color-border-dim);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.task-card:hover {
    border-color: var(--color-border);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.task-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.task-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.task-schedule {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    background: rgba(99,102,241,0.15);
    color: var(--color-brand-400);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
    flex-shrink: 0;
}

.task-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.task-assignee {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.task-due {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.task-due.overdue {
    color: var(--color-danger);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.5;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: var(--gradient-brand);
    color: white;
    box-shadow: var(--shadow-brand);
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(99,102,241,0.45);
}

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

.btn-secondary {
    background: var(--color-surface-3);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-dim);
}

.btn-secondary:hover {
    background: var(--color-surface-2);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-danger {
    background: rgba(248, 113, 113, 0.1);
    color: var(--color-danger);
    border: 1px solid rgba(248,113,113,0.2);
}

.btn-danger:hover {
    background: rgba(248, 113, 113, 0.2);
}

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

.btn-ghost:hover {
    background: var(--color-surface-3);
    color: var(--color-text-primary);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: 0.8rem;
}

.btn-lg {
    padding: var(--space-3) var(--space-8);
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* --- Forms --- */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
}

.form-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
}

.form-control {
    background: var(--color-surface-2);
    border: 1px solid var(--color-border-dim);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
    outline: none;
}

.form-control:focus {
    border-color: var(--color-brand-500);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

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

select.form-control {
    cursor: pointer;
    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='%239494b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: var(--space-8);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.form-error {
    font-size: 0.8rem;
    color: var(--color-danger);
    background: rgba(248,113,113,0.08);
    border: 1px solid rgba(248,113,113,0.2);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-3);
}

/* --- Auth Pages --- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.auth-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 60% 30%, rgba(99,102,241,0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 30% 70%, rgba(139,92,246,0.08) 0%, transparent 50%);
    pointer-events: none;
}

.auth-box {
    background: var(--color-surface-1);
    border: 1px solid var(--color-border-dim);
    border-radius: var(--radius-xl);
    padding: var(--space-10) var(--space-10);
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 1;
}

.auth-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-8);
}

.auth-logo-icon {
    width: 44px;
    height: 44px;
    background: var(--gradient-brand);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    box-shadow: var(--shadow-brand);
}

.auth-logo-name {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.auth-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

.auth-footer {
    margin-top: var(--space-6);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.auth-footer a {
    color: var(--color-brand-400);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.auth-footer a:hover {
    color: var(--color-violet-400);
}

/* --- Table --- */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-dim);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface-1);
    font-size: 0.875rem;
}

.table th {
    padding: var(--space-3) var(--space-5);
    text-align: left;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border-dim);
    background: var(--color-surface-2);
    white-space: nowrap;
}

.table td {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border-dim);
    color: var(--color-text-secondary);
    vertical-align: middle;
}

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

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

.table tbody tr:hover {
    background: var(--color-surface-2);
}

/* --- Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.badge-success {
    background: rgba(52,211,153,0.12);
    color: var(--color-success);
}

.badge-warning {
    background: rgba(251,191,36,0.12);
    color: var(--color-warning);
}

.badge-danger {
    background: rgba(248,113,113,0.12);
    color: var(--color-danger);
}

.badge-brand {
    background: rgba(99,102,241,0.15);
    color: var(--color-brand-400);
}

/* --- Alert / Banner --- */
.alert {
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    font-size: 0.875rem;
    border-width: 1px;
    border-style: solid;
    margin-bottom: var(--space-5);
}

.alert-error {
    background: rgba(248,113,113,0.08);
    border-color: rgba(248,113,113,0.25);
    color: var(--color-danger);
}

.alert-success {
    background: rgba(52,211,153,0.08);
    border-color: rgba(52,211,153,0.25);
    color: var(--color-success);
}

/* --- Empty State --- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
    gap: var(--space-4);
    color: var(--color-text-muted);
    text-align: center;
}

.empty-state-icon {
    font-size: 3rem;
    opacity: 0.4;
}

.empty-state-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.empty-state-desc {
    font-size: 0.85rem;
    max-width: 280px;
}

/* --- Loading / Skeleton --- */
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-brand-500);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}

.skeleton {
    background: linear-gradient(90deg,
        var(--color-surface-2) 25%,
        var(--color-surface-3) 50%,
        var(--color-surface-2) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-right  { text-align: right; }
.flex        { display: flex; }
.flex-col    { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.mt-4   { margin-top: var(--space-4); }
.mt-6   { margin-top: var(--space-6); }
.mb-4   { margin-bottom: var(--space-4); }
.mb-6   { margin-bottom: var(--space-6); }
.w-full { width: 100%; }

/* --- Responsive Sidebar --- */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: var(--space-4);
    left: var(--space-4);
    z-index: 101;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border-dim);
    color: var(--color-text-primary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: var(--shadow-sm);
}

.sidebar-backdrop {
    display: none;
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar-open .sidebar {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: var(--space-4);
        padding-top: calc(var(--space-4) + 40px + var(--space-4));
    }

    .task-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .auth-box {
        padding: var(--space-6);
    }

    .sidebar-open .sidebar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(2px);
        z-index: 99;
    }
}