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

:root {
    --color-bg: #f1f5f9;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-income: #16a34a;
    --color-income-bg: #f0fdf4;
    --color-outgoing: #dc2626;
    --color-outgoing-bg: #fef2f2;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-success: #16a34a;
    --color-success-bg: #f0fdf4;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* === Navbar === */
.navbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 0;
    padding-top: calc(0.75rem + env(safe-area-inset-top));
    margin-bottom: 2rem;
}

.navbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
    line-height: 1.4;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.8125rem;
}

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

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

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

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

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

.btn-outline:hover {
    background: var(--color-bg);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* === Forms === */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem; /* 16px prevents iOS auto-zoom */
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color 0.15s ease;
}

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

.form-inline {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
}

.form-inline .form-group {
    margin-bottom: 0;
    flex: 1;
}

.form-inline .btn {
    flex-shrink: 0;
}

/* === Auth Card === */
.auth-card {
    max-width: 400px;
    margin: 2rem auto;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 2rem;
}

.auth-card h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

/* === Alerts === */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
    animation: fadeIn 0.2s ease;
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid #bbf7d0;
}

.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid #fecaca;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-0.5rem); }
    to { opacity: 1; transform: translateY(0); }
}

/* === Text utilities === */
.text-muted {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.text-income {
    color: var(--color-income);
    font-weight: 600;
}

.text-outgoing {
    color: var(--color-outgoing);
    font-weight: 600;
}

.text-positive {
    color: var(--color-income);
    font-weight: 700;
}

.text-negative {
    color: var(--color-outgoing);
    font-weight: 700;
}

/* === Tables === */
.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th,
table td {
    padding: 0.625rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
}

table th {
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    color: var(--color-text-muted);
    background: var(--color-bg);
}

table tbody tr:hover {
    background: #f8fafc;
}

table td.actions {
    white-space: nowrap;
}

table td.amount {
    font-variant-numeric: tabular-nums;
    text-align: right;
}

table th.amount {
    text-align: right;
}

/* === Cards === */
.card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

/* === Page Header === */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

/* === Summary Bar === */
.summary-bar {
    display: flex;
    gap: 1.5rem;
    padding: 1rem 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.summary-item {
    text-align: center;
    flex: 1;
}

.summary-item .label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.summary-item .value {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

/* === Two Column Layout === */
.columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--color-text-muted);
}

.empty-state p {
    margin-bottom: 1rem;
}

/* === Inline Edit === */
.inline-edit-form {
    display: inline-flex;
    gap: 0.25rem;
    align-items: center;
}

.inline-edit-form input {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

/* === Sheet Date === */
.sheet-meta {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.sheet-meta a {
    color: var(--color-primary);
    text-decoration: none;
}

.sheet-meta a:hover {
    text-decoration: underline;
}

/* === Action buttons row === */
.actions-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* === Edit Row === */
.edit-row td {
    background: var(--color-bg);
    padding: 0.75rem;
}

.edit-row .form-inline {
    flex-wrap: wrap;
}

/* === Dashboard Sheet Links === */
table a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

table a:hover {
    text-decoration: underline;
}

/* === Footer spacing === */
main.container {
    padding-bottom: calc(3rem + env(safe-area-inset-bottom));
}

/* === Mobile Sheet Cards (dashboard) === */
.sheet-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.sheet-card-link {
    display: block;
    padding: 1rem;
    text-decoration: none;
    color: var(--color-text);
    transition: background 0.15s ease;
}

.sheet-card-link:active {
    background: #f8fafc;
}

.sheet-card-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 1rem 0.75rem;
    border-top: 1px solid var(--color-border);
}

.sheet-card-actions form {
    flex: 1;
}

.sheet-card-actions .btn {
    width: 100%;
}

.sheet-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.75rem;
}

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

.sheet-card-date {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.sheet-card-totals {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    text-align: center;
    font-size: 1rem;
    font-variant-numeric: tabular-nums;
}

.sheet-card-labels {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    text-align: center;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* === Visibility Helpers === */
.mobile-only { display: none; }
.desktop-only { display: block; }

/* === Print Styles === */
@media print {
    .navbar, .btn, .actions, .actions-row, form, .edit-row, .mobile-only {
        display: none !important;
    }

    .desktop-only { display: block !important; }

    body {
        background: #fff;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .summary-bar {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* === Responsive === */
@media (max-width: 768px) {
    /* Show mobile, hide desktop */
    .mobile-only { display: block; }
    .desktop-only { display: none; }

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

    .summary-bar {
        flex-direction: row;
        gap: 0.5rem;
        padding: 0.75rem;
    }

    .summary-item .value {
        font-size: 1.1rem;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .page-header h1 {
        font-size: 1.25rem;
    }

    table {
        font-size: 0.875rem;
    }

    table th, table td {
        padding: 0.5rem;
    }

    /* Stack add-item forms on mobile */
    .form-inline {
        flex-wrap: wrap;
    }

    .form-inline .form-group {
        min-width: 0;
        flex: 1 1 100%;
    }

    .form-inline .form-group[style*="max-width"] {
        flex: 1 1 auto !important;
        max-width: none !important;
    }

    .form-inline .btn {
        width: 100%;
    }

    /* All buttons meet 44px touch target */
    .btn {
        min-height: 44px;
        padding: 0.625rem 1rem;
    }

    .btn-sm {
        padding: 0.5rem 0.875rem;
        font-size: 0.875rem;
        min-height: 44px;
        min-width: 44px;
    }

    /* Inline edit inputs must be 16px to prevent iOS zoom */
    .inline-edit-form input {
        font-size: 1rem;
    }

    /* Edit row buttons: side-by-side, not full width */
    .edit-row .form-inline .btn {
        width: auto;
        flex: 1;
    }

    /* Rename form on mobile */
    #rename-form {
        flex-wrap: wrap;
    }

    #rename-form .form-group {
        flex: 1 1 100%;
    }

    #rename-form .btn {
        flex: 1;
    }

    /* Navbar brand touch target */
    .navbar-brand {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    .auth-card {
        margin: 1rem;
        padding: 1.5rem;
    }

    .card {
        padding: 1rem;
        border-radius: 6px;
    }

    .card-header h2 {
        font-size: 1rem;
    }

    /* Navbar spacing */
    .navbar {
        margin-bottom: 1rem;
    }

    .container {
        padding: 0 0.75rem;
    }
}

/* === Extra small screens (iPhone SE, etc.) === */
@media (max-width: 374px) {
    .summary-item .value {
        font-size: 0.95rem;
    }

    .summary-item .label {
        font-size: 0.6875rem;
    }

    .summary-bar {
        padding: 0.5rem;
        gap: 0.25rem;
    }

    .sheet-card-totals {
        font-size: 0.9rem;
    }
}