/* ===== Base & Variables ===== */
:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 40px -4px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

body {
    background: linear-gradient(135deg, #f0f4ff 0%, #f9fafb 50%, #fdf2f8 100%);
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
}

/* ===== Dark mode ===== */
[data-bs-theme="dark"] body {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
}
[data-bs-theme="dark"] .card {
    background: #1e293b;
    border: 1px solid rgba(255,255,255,0.06);
}
[data-bs-theme="dark"] .stat-card .stat-label { color: #94a3b8; }
[data-bs-theme="dark"] .collapsible-header:hover { background: rgba(255,255,255,0.05); }
[data-bs-theme="dark"] .list-group-item { border-color: rgba(255,255,255,0.06); }
[data-bs-theme="dark"] .list-group-item-action:hover { background: rgba(255,255,255,0.04); }
[data-bs-theme="dark"] .table th { color: #94a3b8; border-color: rgba(255,255,255,0.1); }
[data-bs-theme="dark"] .table td { border-color: rgba(255,255,255,0.05); }
[data-bs-theme="dark"] .table-hover tbody tr:hover { background: rgba(255,255,255,0.03); }
[data-bs-theme="dark"] .form-control, [data-bs-theme="dark"] .form-select {
    background: #0f172a; border-color: rgba(255,255,255,0.1); color: #e2e8f0;
}
[data-bs-theme="dark"] .dropdown-menu { background: #1e293b; border: 1px solid rgba(255,255,255,0.1); }
[data-bs-theme="dark"] .dropdown-item { color: #e2e8f0; }
[data-bs-theme="dark"] .dropdown-item:hover { background: rgba(255,255,255,0.08); }
[data-bs-theme="dark"] .dropdown-divider { border-color: rgba(255,255,255,0.08); }
[data-bs-theme="dark"] h3 { color: #f1f5f9; }
[data-bs-theme="dark"] .login-card { background: #1e293b; }
[data-bs-theme="dark"] .empty-state i { color: #475569; }

/* ===== Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); max-height: 0; }
    to { opacity: 1; transform: translateY(0); max-height: 500px; }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.animate-in { animation: fadeInUp 0.5s ease forwards; }
.animate-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.animate-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.animate-in-delay-3 { animation-delay: 0.3s; opacity: 0; }

/* ===== Top bar ===== */
.topbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

/* ===== Cards ===== */
.card {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
    animation: fadeInUp 0.4s ease forwards;
    background: #fff;
}

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

.card-header {
    border-radius: var(--radius) var(--radius) 0 0 !important;
    border-bottom: 1px solid var(--gray-100);
    padding: 1rem 1.25rem;
}

.card-body { padding: 1.25rem; }

/* ===== Stat Cards ===== */
.stat-card {
    text-align: center;
    padding: 1.5rem 1rem;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: var(--radius) var(--radius) 0 0;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.stat-card .stat-label {
    color: var(--gray-500);
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 0.25rem;
}

@media (max-width: 767.98px) {
    .stat-card { padding: 1rem 0.75rem; }
    .stat-card .stat-value { font-size: 1.5rem; }
}

/* ===== Balance ===== */
.balance-positive { color: var(--success); font-weight: 700; }
.balance-negative { color: var(--danger); font-weight: 700; }

/* ===== Login ===== */
.login-container {
    max-width: 420px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.login-card {
    border-radius: 24px;
    padding: 2.5rem 2rem;
    width: 100%;
    animation: scaleIn 0.5s ease;
    box-shadow: var(--shadow-xl);
}

.login-card .login-icon {
    width: 72px; height: 72px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

.login-card .login-icon i { font-size: 2rem; color: #fff; }
.login-card .login-icon img { display: block; }

/* Login input group - seamless border */
.login-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.login-input-group .login-input-icon {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    font-size: 1rem;
    pointer-events: none;
    z-index: 2;
}

.login-input-group .form-control {
    padding-left: 46px;
    border-radius: var(--radius-sm) !important;
}

/* ===== Forms ===== */
.form-control, .form-select {
    border-radius: var(--radius-sm);
    border: 2px solid var(--gray-200);
    padding: 0.65rem 1rem;
    transition: var(--transition);
    font-size: 0.95rem;
}

.form-select {
    padding-right: 2.5rem;
    background-position: right 0.75rem center;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
    transform: translateY(-1px);
}

.form-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: 0.4rem;
}

.form-check-input {
    width: 1.15em; height: 1.15em;
    border: 2px solid var(--gray-300);
    transition: var(--transition);
}

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

/* ===== Buttons ===== */
.btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
    padding: 0.6rem 1.25rem;
    transition: var(--transition);
    font-size: 0.9rem;
    border: 2px solid transparent;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
    transform: translateY(-1px);
}

.btn-outline-primary { color: var(--primary); border-color: var(--primary); }
.btn-outline-primary:hover {
    background: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-outline-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.8rem; }

/* ===== Tables ===== */
.table { margin-bottom: 0; }

.table th {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    border-bottom: 2px solid var(--gray-200);
    padding: 0.75rem;
}

.table td {
    padding: 0.85rem 0.75rem;
    vertical-align: middle;
    border-color: var(--gray-100);
}

.table-hover tbody tr { transition: var(--transition); }
.table-hover tbody tr:hover {
    background: linear-gradient(90deg, rgba(79,70,229,0.03), transparent);
}

/* ===== Badges ===== */
.badge {
    border-radius: 8px;
    padding: 0.35em 0.75em;
    font-weight: 600;
    font-size: 0.75rem;
}

.badge-shared {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    color: #065f46;
}

.badge.bg-success {
    background: linear-gradient(135deg, var(--success), #059669) !important;
}

/* ===== Alerts ===== */
.alert {
    border: none;
    border-radius: var(--radius-sm);
    animation: slideDown 0.4s ease forwards;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

/* ===== Collapsible sections ===== */
.collapsible-header {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    transition: var(--transition);
    user-select: none;
}

.collapsible-header:hover { background: var(--gray-50); }

.collapsible-header .collapse-icon {
    transition: transform 0.3s ease;
    font-size: 1.2rem;
}

.collapsible-header[aria-expanded="true"] .collapse-icon {
    transform: rotate(180deg);
}

/* ===== List groups ===== */
.list-group-item {
    border: none;
    border-bottom: 1px solid var(--gray-100);
    padding: 0.85rem 1rem;
    transition: var(--transition);
}

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

.list-group-item-action:hover {
    background: linear-gradient(90deg, rgba(79,70,229,0.04), transparent);
    transform: translateX(4px);
}

/* ===== Page titles ===== */
h3 {
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}

/* ===== FAB ===== */
.fab {
    position: fixed;
    bottom: calc(80px + env(safe-area-inset-bottom, 0));
    right: 1.25rem;
    width: 56px; height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
    z-index: 1020;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.fab:hover { transform: scale(1.08); box-shadow: 0 12px 28px rgba(79, 70, 229, 0.5); color: #fff; }
.fab:active { transform: scale(0.95); }

@media (max-width: 767.98px) {
    .fab { display: flex; }
    .mobile-hide-btn { display: none !important; }
}

/* ===== Responsive ===== */
@media (max-width: 767.98px) {
    h3 { font-size: 1.35rem; }
    .card-body { padding: 1rem; }
    .d-flex.justify-content-between.align-items-center.mb-4 {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 0.75rem;
    }
    .btn { padding: 0.55rem 1rem; }
    .row.g-3 > [class*="col-"],
    .row.g-4 > [class*="col-"] {
        padding-left: 0.4rem;
        padding-right: 0.4rem;
    }
}

/* ===== Empty states ===== */
.empty-state { padding: 3rem 1rem; text-align: center; }
.empty-state i { font-size: 3.5rem; color: var(--gray-300); margin-bottom: 1rem; display: block; }
.empty-state p { color: var(--gray-500); font-size: 1rem; }

/* ===== Admin badge ===== */
.admin-badge {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #78350f;
    font-size: 0.7rem;
    padding: 0.2em 0.6em;
    border-radius: 6px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Misc ===== */
html { scroll-behavior: smooth; }
::selection { background: rgba(79, 70, 229, 0.15); }

#sharedSection {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.container.mt-4 { animation: fadeIn 0.3s ease; }

/* ===== Touch ===== */
@media (hover: none) and (pointer: coarse) {
    .btn { min-height: 44px; }
    .form-control, .form-select { min-height: 44px; font-size: 16px; }
    .nav-link { min-height: 44px; }
    .table td { padding: 0.9rem 0.75rem; }
}

/* ===== User avatar ===== */
.user-avatar {
    width: 36px; height: 36px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: #fff;
    flex-shrink: 0;
}

.user-avatar-1 { background: linear-gradient(135deg, #4f46e5, #818cf8); }
.user-avatar-2 { background: linear-gradient(135deg, #10b981, #34d399); }
.user-avatar-3 { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.user-avatar-4 { background: linear-gradient(135deg, #ef4444, #f87171); }
.user-avatar-5 { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }

/* ===== Color picker ===== */
.color-swatch {
    width: 36px; height: 36px;
    border-radius: 10px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    border: 3px solid transparent;
}

.color-swatch i { color: #fff; opacity: 0; font-size: 1rem; transition: var(--transition); }
.color-swatch.active { border-color: var(--gray-900); transform: scale(1.1); }
.color-swatch.active i { opacity: 1; }
.color-swatch:hover { transform: scale(1.1); }

/* ===== Theme picker ===== */
.theme-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    border: 2px solid var(--gray-200);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-500);
    flex: 1;
    text-align: center;
}

.theme-option i { font-size: 1.3rem; }
.theme-option:hover { border-color: var(--primary-light); color: var(--primary); }
.theme-option.active {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.06);
    color: var(--primary);
}

/* ===== Dropdown menu styling ===== */
.dropdown-menu {
    animation: fadeInUp 0.2s ease;
    border-radius: 12px !important;
    padding: 0.5rem;
}

.dropdown-item {
    border-radius: 8px;
    font-size: 0.9rem;
}

.dropdown-item:hover {
    background: var(--gray-100);
}

.dropdown-header {
    color: var(--gray-500) !important;
}

/* ===== Grocery toggle ===== */
/* ===== Sort bar (horizontal scroll) ===== */
.sort-bar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    flex-wrap: nowrap;
}

.sort-bar::-webkit-scrollbar { display: none; }

.grocery-toggle {
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.8rem;
    padding: 0.4rem 0.75rem;
    transition: var(--transition);
}

/* ===== Month chips ===== */
.month-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px; height: 36px;
    border-radius: 8px;
    border: 2px solid var(--gray-200);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.month-chip:hover { border-color: var(--primary-light); color: var(--primary); }
.month-chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* ===== Progress bar ===== */
.progress {
    background: var(--gray-100);
    overflow: hidden;
}

.grocery-toggle.active {
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    color: #fff !important;
    box-shadow: 0 2px 8px color-mix(in srgb, var(--primary), transparent 70%);
}