:root {
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --container-bg: #ffffff;
    --text-primary: #333;
    --text-secondary: #666;
    --text-muted: #999;
    --border-color: #e0e0e0;
    --dashed-border: #ddd;
    --card-bg: #f8f9fa;
    --input-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --overlay-bg: rgba(255, 255, 255, 0.9);
    --info-bg: #e7f3ff;
    --info-text: #1976D2;
    --info-border: #2196F3;
    --warning-bg: #fff3cd;
    --warning-text: #856404;
    --danger-bg: #fdecea;
    --danger-text: #b3261e;
    --success-bg: #eafaf1;
    --success-text: #1e7e34;
}

html.dark-mode {
    --bg-gradient: linear-gradient(135deg, #1b1d2b 0%, #2a1f3d 100%);
    --container-bg: #1e1e2b;
    --text-primary: #e6e6f0;
    --text-secondary: #b0b0c3;
    --text-muted: #82829c;
    --border-color: #3a3a4d;
    --dashed-border: #4a4a5f;
    --card-bg: #2a2a3c;
    --input-bg: #26263a;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --overlay-bg: rgba(20, 20, 30, 0.92);
    --info-bg: #1c3450;
    --info-text: #7fc4ff;
    --info-border: #2196F3;
    --warning-bg: #4a3c14;
    --warning-text: #ffd873;
    --danger-bg: #4a1f22;
    --danger-text: #ff9a95;
    --success-bg: #1c3d28;
    --success-text: #7fe0a0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    padding: 20px;
    padding-bottom: 80px;
    transition: background 0.3s;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--container-bg);
    border-radius: 20px;
    padding: 16px 30px 30px;
    box-shadow: 0 10px 40px var(--shadow-color);
    transition: background 0.3s;
}

.user-bar {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.user-bar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-bar strong {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

.hamburger-btn {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 4px;
    font-size: 20px;
    line-height: 1;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: none;
}

.hamburger-btn:hover {
    background: var(--card-bg);
    transform: none;
    box-shadow: none;
}

.nav-dropdown {
    display: none;
    position: absolute;
    top: 38px;
    left: 0;
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 8px 24px var(--shadow-color);
    min-width: 200px;
    z-index: 500;
    overflow: hidden;
}

.nav-dropdown.show {
    display: block;
}

.nav-dropdown .nav-item {
    width: 100%;
    text-align: left;
    background: none;
    color: var(--text-primary);
    border: none;
    border-radius: 0;
    padding: 14px 18px;
    font-size: 15px;
    font-weight: 600;
    box-shadow: none;
}

.nav-dropdown .nav-item:hover {
    background: var(--card-bg);
    transform: none;
    box-shadow: none;
}

.nav-dropdown .nav-item.active {
    color: #667eea;
    background: var(--info-bg);
}

.current-section-label {
    text-align: center;
    margin-top: -20px;
    margin-bottom: 20px;
    font-weight: 600;
    color: #667eea;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.theme-toggle-btn {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 4px;
    font-size: 15px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: none;
}

.theme-toggle-btn:hover {
    background: var(--card-bg);
    transform: none;
    box-shadow: none;
}

.bottom-bar {
    margin-top: 75px;
}

.budget-collapsed {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.budget-collapsed span {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
}

h1 {
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
}

h2 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 24px;
}

h3 {
    color: var(--text-primary);
}

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

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

.text-secondary {
    color: var(--text-secondary);
}

a {
    color: #667eea;
}

/* Centered auth card (login / accept-invite / reset-password pages) */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    text-align: center;
    max-width: 400px;
    width: 100%;
}

.auth-card h1 {
    font-size: 26px;
    margin-bottom: 8px;
}

.auth-card .subtitle {
    margin-bottom: 25px;
}

.auth-card form {
    text-align: left;
}

.auth-links {
    margin-top: 15px;
    font-size: 14px;
}

.error-message {
    background: #fdecea;
    color: #b3261e;
    border-left: 4px solid #dc3545;
    padding: 12px;
    border-radius: 4px;
    margin-bottom: 15px;
    font-size: 14px;
    display: none;
}

.error-message.show {
    display: block;
}

/* Tabs */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 16px;
    transition: border-color 0.3s, background 0.3s, color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

/* Buttons */
button {
    width: 100%;
    padding: 15px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

button:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

button.secondary-btn {
    background: #6c757d;
}

button.secondary-btn:hover {
    background: #5a6268;
}

button.warning-btn {
    background: #f0ad4e;
}

button.warning-btn:hover {
    background: #ec971f;
}

button.danger-btn {
    background: #dc3545;
}

button.danger-btn:hover {
    background: #c82333;
}

button.small-btn {
    width: auto;
    padding: 8px 14px;
    font-size: 13px;
}

/* Balance Display */
.balance-display {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px 30px;
    border-radius: 15px;
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

.usage-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    transition: background-color 0.3s;
}

.usage-bar.usage-green {
    background: #28a745;
}

.usage-bar.usage-yellow {
    background: #ffc107;
}

.usage-bar.usage-orange {
    background: #fd7e14;
}

.usage-bar.usage-red {
    background: #dc3545;
}

.balance-display h2 {
    font-size: 24px;
    margin-bottom: 10px;
    color: white;
}

.balance-display p {
    font-size: 16px;
    opacity: 0.9;
    color: white;
}

.balance-display h2.over-budget {
    color: #ffd6d6;
}

/* Expenses List */
.expense-item {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.expense-amount {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.expense-description {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 3px;
}

.expense-date {
    color: var(--text-muted);
    font-size: 12px;
}

/* Info Box */
.info-box {
    background: var(--info-bg);
    border-left: 4px solid var(--info-border);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
    color: var(--info-text);
    font-size: 14px;
}

/* Reset / Danger Section */
.reset-section {
    background: var(--warning-bg);
    padding: 20px;
    border-radius: 12px;
    margin-top: 25px;
}

.reset-section h3,
.reset-section p {
    color: var(--warning-text);
}

/* Admin: list rows shared by users / groups / invites / members */
.list-row {
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.items-panel {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--dashed-border);
}

/* Compact add/edit forms (categories, items): label beside its field, tight spacing */
.stacked-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--input-bg);
    padding: 15px;
    border-radius: 8px;
    border: 2px dashed var(--dashed-border);
    margin-top: 10px;
}

.form-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.form-row label {
    flex: 0 0 100px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
    margin-bottom: 0;
}

.form-row > input,
.form-row > select,
.form-row > div {
    flex: 1;
    min-width: 0;
}

.form-row input,
.form-row select {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 15px;
    transition: border-color 0.3s, background 0.3s, color 0.3s;
}

.form-row input:focus,
.form-row select:focus {
    outline: none;
    border-color: #667eea;
}

.list-row .row-main {
    flex: 1;
    min-width: 150px;
}

.list-row .row-main strong {
    display: block;
    color: var(--text-primary);
}

.list-row .row-main small {
    color: var(--text-muted);
}

.list-row .row-actions {
    display: flex;
    gap: 8px;
}

.role-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    background: var(--info-bg);
    color: var(--info-text);
}

.role-badge.admin {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    background: var(--success-bg);
    color: var(--success-text);
}

.status-badge.disabled {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.status-badge.invited {
    background: var(--warning-bg);
    color: var(--warning-text);
}

.section-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
}

.section-card h3 {
    margin-bottom: 15px;
}

.inline-form {
    display: grid;
    grid-template-columns: 2fr 1fr auto;
    gap: 10px;
    align-items: end;
    background: var(--input-bg);
    padding: 15px;
    border-radius: 8px;
    border: 2px dashed var(--dashed-border);
}

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 15px;
}

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

/* Install Prompt */
.install-prompt {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    max-width: 400px;
    margin: 0 auto;
    background: var(--container-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    display: none;
}

.install-prompt.show {
    display: block;
}

/* Amount display button (opens the numeric keypad picker) */
.amount-display-btn {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
}

.amount-display-btn:hover {
    background: var(--input-bg);
    border-color: #667eea;
    transform: none;
    box-shadow: none;
}

.amount-display-btn.readonly-sum {
    cursor: default;
    color: var(--text-secondary);
    background: var(--card-bg);
}

.amount-display-btn.readonly-sum:hover {
    border-color: var(--border-color);
}

/* Numeric keypad amount picker (bottom sheet) */
.amount-picker-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: flex-end;
    justify-content: center;
    z-index: 10001;
}

.amount-picker-overlay.show {
    display: flex;
}

.amount-picker-sheet {
    background: var(--container-bg);
    width: 100%;
    max-width: 600px;
    border-radius: 20px 20px 0 0;
    padding-bottom: 20px;
    box-shadow: 0 -4px 20px var(--shadow-color);
}

.amount-picker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.amount-picker-header button {
    width: auto;
    background: none;
    color: #667eea;
    font-weight: 600;
    font-size: 15px;
    padding: 4px 8px;
}

.amount-picker-header button:hover {
    background: none;
    transform: none;
    box-shadow: none;
}

.amount-picker-header .amount-picker-done {
    font-weight: 700;
}

.amount-picker-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
}

.amount-picker-display {
    text-align: center;
    font-size: 40px;
    font-weight: 700;
    color: var(--text-primary);
    padding: 24px 0;
}

.amount-picker-keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    padding: 0 20px 8px;
}

.amount-picker-key {
    padding: 16px;
    font-size: 22px;
    font-weight: 600;
    border-radius: 10px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
}

.amount-picker-key:hover {
    background: var(--input-bg);
    border-color: #667eea;
    transform: none;
    box-shadow: none;
}

.amount-picker-key.key-clear,
.amount-picker-key.key-backspace {
    color: #667eea;
    font-size: 20px;
}

/* Cash / Card toggle buttons */
.method-toggle {
    display: flex;
    gap: 10px;
}

.method-toggle button {
    width: auto;
    flex: 1;
    padding: 10px;
    background: var(--card-bg);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    font-size: 14px;
    font-weight: 600;
}

.method-toggle button:hover {
    transform: none;
    box-shadow: none;
}

.method-toggle button.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.method-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    background: var(--info-bg);
    color: var(--info-text);
    text-transform: uppercase;
}

.method-badge.card {
    background: var(--warning-bg);
    color: var(--warning-text);
}

.method-badge.digital {
    background: var(--success-bg);
    color: var(--success-text);
}

/* Version History */
.version-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 15px;
    background: var(--card-bg);
    border-radius: 8px;
    margin-bottom: 8px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
}

.version-row:hover {
    background: var(--info-bg);
}

.version-detail {
    background: var(--input-bg);
    border: 1px dashed var(--dashed-border);
    border-radius: 8px;
    padding: 15px;
    margin: -4px 0 12px;
    color: var(--text-secondary);
    font-size: 14px;
    white-space: pre-wrap;
}

/* Bulk Import: wider container on this tab -- built primarily for desktop/web use with statement-sized row counts */
.container.bulk-import-wide {
    max-width: 900px;
}

.bulk-import-row {
    display: grid;
    grid-template-columns: 22px 90px 1fr 90px 200px;
    gap: 12px;
    align-items: center;
    padding: 10px 6px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.bulk-import-row select {
    width: 100%;
}

.bulk-import-header {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    border-bottom: 2px solid var(--border-color);
}

.bulk-import-row-duplicate {
    background: var(--warning-bg);
    border-radius: 6px;
}

@media (max-width: 700px) {
    .bulk-import-header {
        display: none;
    }
    .bulk-import-row {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 6px 10px;
    }
    .bulk-import-row > select,
    .bulk-import-row > div {
        flex-basis: 100%;
    }
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: white;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transition: all 0.3s;
    z-index: 10000;
    max-width: 90%;
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}