/* CSS Variables based on UX design */
:root {
    --bg-color: #f4f7fa;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --primary-color: #3b82f6;
    /* Blue */
    --primary-hover: #2563eb;
    --accent-color: #818cf8;
    /* Light purple-blue */
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;

    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;

    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Typography */
h1,
h2,
h3,
h4 {
    color: var(--text-primary);
    font-weight: 600;
}

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

/* --- Sidebar --- */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px;
    height: 100%;
    overflow-y: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.menu-section {
    margin-bottom: 24px;
}

.menu-section h4 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

nav a i {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

nav a:hover {
    background-color: #f1f5f9;
    color: var(--text-primary);
}

nav a.active {
    background-color: #eff6ff;
    color: var(--primary-color);
}

.badge {
    background-color: var(--danger-color);
    color: white;
    font-size: 10px;
    font-weight: 700;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-left: auto;
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px 32px;
    overflow-y: auto;
}

/* Header */
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.header-left h1 {
    font-size: 24px;
    margin-bottom: 4px;
}

.header-left p {
    font-size: 14px;
}

.icon-btn:hover {
    background: #f8fafc;
}

.user-profile>i {
    font-size: 12px;
    color: var(--text-secondary);
}


/* Summary Cards */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

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

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(0, 0, 0, 0.02);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.card h2 {
    font-size: 28px;
    margin-bottom: 0;
    color: var(--text-primary);
}

.card p {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.card-icon-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.card-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.pending-icon {
    background-color: #fef3c7;
    color: #d97706;
}

.paid-icon {
    background-color: #d1fae5;
    color: #059669;
}

.card-label {
    margin-bottom: 12px;
}

.card-amounts {
    display: flex;
    gap: 12px;
    width: 100%;
}

.card-amounts span {
    background-color: #f1f5f9;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    text-align: center;
}

.summary-pending .card-amounts span {
    background-color: #fefce8;
    color: #92400e;
}

.summary-paid .card-amounts span {
    background-color: #ecfdf5;
    color: #065f46;
}

.highlight-card {
    background-color: #f8fafc;
}

/* Calendar Area */
.content-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--card-shadow);
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

.calendar-header h3 {
    font-size: 18px;
}

.calendar-controls {
    display: flex;
    gap: 8px;
}

.calendar-controls .border-btn {
    border-radius: var(--border-radius-sm);
    width: auto;
    padding: 0 16px;
    font-size: 13px;
    font-weight: 500;
}

.calendar-controls .icon-btn {
    width: 36px;
    height: 36px;
    padding: 0;
}

.calendar-wrapper {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.calendar-days-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: minmax(100px, 1fr);
    gap: 8px;
    flex: 1;
}

/* Individual Calendar Day */
.calendar-day {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius-sm);
    padding: 8px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.2s;
    cursor: pointer;
}

.calendar-day:hover {
    border-color: var(--primary-color);
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.calendar-day.empty {
    background-color: transparent;
    border-color: transparent;
    cursor: default;
}

.calendar-day.empty:hover {
    box-shadow: none;
}

.day-number {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 6px;
    display: inline-block;
    width: 24px;
    height: 24px;
    text-align: center;
    line-height: 24px;
    border-radius: 50%;
}

.calendar-day.today .day-number {
    background-color: var(--primary-color);
    color: white;
}

/* Debts pills in calendar */
.debt-item {
    background-color: #dbeafe;
    color: #1e40af;
    font-size: 11px;
    padding: 4px 6px;
    border-radius: 4px;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    justify-content: space-between;
    font-weight: 500;
    border-left: 3px solid var(--primary-color);
}

.debt-item.high {
    background-color: #fee2e2;
    color: #991b1b;
    border-left-color: var(--danger-color);
}

.debt-item.medium {
    background-color: #fef3c7;
    color: #92400e;
    border-left-color: var(--warning-color);
}

/* --- Modal --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background-color: white;
    width: 90%;
    max-width: 500px;
    padding: 24px;
    position: relative;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 18px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.modal-debts-list {
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-debt-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    background-color: #f8fafc;
}

.modal-debt-card h4 {
    font-size: 15px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.debt-detail-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 6px;
}

.debt-detail-row span:first-child {
    color: var(--text-secondary);
}

.debt-detail-row span:last-child {
    font-weight: 500;
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    justify-content: flex-end;
}

.btn {
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

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

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: #f1f5f9;
}

/* --- Table --- */
.providers-table-container {
    overflow-x: auto;
    width: 100%;
}

.providers-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.providers-table th,
.providers-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.providers-table th {
    background-color: #f8fafc;
    font-weight: 600;
    color: var(--text-secondary);
}

.providers-table tr:hover {
    background-color: #f8fafc;
}

.status-badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.active {
    background-color: #d1fae5;
    color: #065f46;
}

.status-badge.inactive {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Sidebar Providers */
.sidebar-empty {
    display: block;
    padding: 10px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
}

.sidebar-loading {
    pointer-events: none;
    opacity: 0.7;
}

/* =============================================
   DEBTS TABS
   ============================================= */
.debts-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* =============================================
   ACTION BUTTONS (Table)
   ============================================= */
.action-buttons {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.action-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    background-color: white;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: #eff6ff;
}

.action-btn.edit-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: #eff6ff;
}

.action-btn.delete-btn:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
    background-color: #fef2f2;
}

.action-btn.copy-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: #eef2ff;
}

.action-btn.bank-btn:hover {
    border-color: var(--warning-color);
    color: var(--warning-color);
    background-color: #fffbeb;
}

.action-btn.paid-btn {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.action-btn.paid-btn:hover {
    background-color: #059669;
    border-color: #059669;
    color: white;
}

/* =============================================
   FORM GRID (Modals)
   ============================================= */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 14px;
    color: var(--text-primary);
    transition: border-color 0.2s;
    width: 100%;
    background-color: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.modal-actions.full-width {
    grid-column: 1 / -1;
}

/* =============================================
   TOAST NOTIFICATION
   ============================================= */
.toast-notification {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background-color: var(--success-color);
    color: white;
    padding: 12px 20px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2000;
}

.toast-notification.show {
    transform: translateY(0);
    opacity: 1;
}

/* Debts table specific */
.debts-table td {
    font-size: 13px;
    white-space: nowrap;
}

.debts-table td:nth-child(6) {
    white-space: normal;
    max-width: 200px;
}

/* =============================================
   LOGIN PAGE
   ============================================= */
.login-body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    font-family: 'Inter', sans-serif;
}

.login-container {
    width: 100%;
    max-width: 440px;
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.logo-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 16px;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.login-logo h1 {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-logo p {
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.auth-form h2 {
    font-size: 20px;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 8px;
}

.auth-form .form-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.auth-form .form-group label i {
    color: var(--text-secondary);
    font-size: 12px;
}

.auth-form .form-input {
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-family: inherit;
    font-size: 14px;
    transition: all 0.2s;
}

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

.auth-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    color: white;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
    margin-top: 8px;
}

.auth-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.auth-error {
    color: #dc2626;
    font-size: 13px;
    text-align: center;
    min-height: 18px;
}

.auth-toggle {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 8px;
}

.auth-toggle a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-toggle a:hover {
    text-decoration: underline;
}

/* =============================================
   HEADER USER INFO
   ============================================= */
.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-greeting {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.user-greeting i {
    font-size: 18px;
    color: var(--primary-color);
}

.btn-outline {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    border-radius: 8px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.btn-outline:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
    background-color: #fef2f2;
}

/* =============================================
   LOGIN EXTRAS (Demo + WhatsApp)
   ============================================= */
.login-divider {
    text-align: center;
    position: relative;
    margin: 8px 0;
}

.login-divider span {
    background: rgba(255, 255, 255, 0.95);
    padding: 0 12px;
    font-size: 13px;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.login-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.demo-btn {
    background: linear-gradient(135deg, #0d9488, #14b8a6) !important;
    margin-top: 0 !important;
}

.demo-btn:hover {
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3) !important;
}

.whatsapp-btn {
    background: linear-gradient(135deg, #25d366, #128c7e) !important;
    text-decoration: none;
    margin-top: 0 !important;
}

.whatsapp-btn:hover {
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.3) !important;
}

/* =============================================
   ADMIN PANEL
   ============================================= */
.admin-dashboard {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--bg-color);
    font-family: 'Inter', sans-serif;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 32px;
    background: white;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.admin-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.admin-header-left h1 {
    font-size: 20px;
    color: var(--text-primary);
}

.admin-header-right {
    display: flex;
    gap: 8px;
}

.admin-logo-icon {
    background: linear-gradient(135deg, #f59e0b, #d97706) !important;
}

.admin-main {
    padding: 24px 32px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.admin-card {
    background: white;
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--card-shadow);
    margin-bottom: 24px;
    border: 1px solid rgba(0, 0, 0, 0.02);
}

.admin-card h2 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.form-row .form-group {
    flex: 1;
}

.create-user-btn {
    padding: 10px 20px;
    white-space: nowrap;
    height: fit-content;
}

.create-user-msg {
    margin-top: 12px;
    font-size: 13px;
    min-height: 20px;
}

.create-user-msg.success {
    color: var(--success-color);
}

.create-user-msg.error {
    color: var(--danger-color);
}

.user-count-badge {
    background: var(--primary-color);
    color: white;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.demo-tag {
    background: #fef3c7;
    color: #d97706;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
    vertical-align: middle;
}

.delete-user-btn:hover {
    border-color: var(--danger-color) !important;
    color: var(--danger-color) !important;
    background-color: #fef2f2 !important;
}

.status-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 12px;
    white-space: nowrap;
}

.status-active {
    background: #dcfce7;
    color: #16a34a;
}

.status-inactive {
    background: #fef2f2;
    color: #dc2626;
}

.action-buttons-group {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: nowrap;
}

/* =============================================
   HAMBURGER BUTTON (hidden on desktop)
   ============================================= */
.hamburger-btn {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1100;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    align-items: center;
    justify-content: center;
}

/* Sidebar overlay (hidden on desktop) */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.5);
    z-index: 999;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    display: block;
}

/* =============================================
   RESPONSIVE: TABLET (≤768px)
   ============================================= */
@media (max-width: 768px) {

    /* Show hamburger */
    .hamburger-btn {
        display: flex;
    }

    /* Body: allow vertical scroll */
    body {
        flex-direction: column;
        height: auto;
        overflow: auto;
    }

    /* Sidebar: off-screen overlay */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        height: 100%;
        z-index: 1000;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
    }

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

    /* Main content: full width */
    .main-content {
        padding: 16px;
        padding-top: 70px;
        /* space for hamburger */
    }

    /* Header: stack */
    .top-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .header-left h1 {
        font-size: 20px;
    }

    .header-right {
        width: 100%;
        justify-content: space-between;
    }

    /* Summary cards: 1 column */
    .summary-cards,
    .summary-cards-2 {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* Calendar grid: smaller cells */
    .calendar-grid {
        grid-auto-rows: minmax(65px, 1fr);
        gap: 4px;
    }

    .calendar-day {
        padding: 4px;
    }

    .day-number {
        font-size: 12px;
        width: 20px;
        height: 20px;
        line-height: 20px;
    }

    .debt-item {
        font-size: 9px;
        padding: 2px 4px;
    }

    .calendar-days-header {
        font-size: 11px;
    }

    .calendar-header {
        flex-wrap: wrap;
        gap: 8px;
    }

    /* Modals: wider on mobile */
    .modal-content {
        width: 95%;
        max-width: none;
        padding: 20px;
        max-height: 90vh;
    }

    /* Form grid: 1 column */
    .form-grid {
        grid-template-columns: 1fr;
    }

    /* Tables: already have overflow-x auto */
    .providers-table th,
    .providers-table td {
        padding: 10px 8px;
        font-size: 13px;
        white-space: nowrap;
    }

    /* Admin panel */
    .admin-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .admin-header-right {
        width: 100%;
        justify-content: flex-end;
    }

    .form-row {
        flex-direction: column;
        gap: 12px;
    }

    .form-row .form-group {
        width: 100%;
    }

    .create-user-btn {
        width: 100%;
    }

    .admin-main {
        padding: 16px;
    }

    .admin-card {
        padding: 16px;
    }

    /* Login page */
    .login-card {
        padding: 24px;
        margin: 16px;
    }

    /* Debts tabs */
    .debts-tabs {
        flex-wrap: wrap;
    }
}

/* =============================================
   RESPONSIVE: PHONE (≤480px)
   ============================================= */
@media (max-width: 480px) {
    .main-content {
        padding: 12px;
        padding-top: 66px;
    }

    .header-left h1 {
        font-size: 18px;
    }

    /* Calendar: compact */
    .calendar-grid {
        grid-auto-rows: minmax(50px, 1fr);
        gap: 2px;
    }

    .calendar-day {
        padding: 3px;
        border-radius: 4px;
    }

    .day-number {
        font-size: 11px;
        width: 18px;
        height: 18px;
        line-height: 18px;
        margin-bottom: 2px;
    }

    .debt-item {
        font-size: 8px;
        padding: 1px 3px;
        margin-bottom: 2px;
    }

    .calendar-days-header {
        font-size: 10px;
        padding-bottom: 6px;
        margin-bottom: 6px;
    }

    /* Card amounts stack */
    .card-amounts {
        flex-direction: column;
        gap: 6px;
    }

    .card h2 {
        font-size: 22px;
    }

    /* Calendar controls */
    .calendar-controls .border-btn {
        padding: 0 10px;
        font-size: 12px;
    }

    .calendar-controls .icon-btn {
        width: 32px;
        height: 32px;
    }

    /* Login */
    .login-card {
        padding: 20px;
        border-radius: 16px;
    }

    .login-logo h1 {
        font-size: 20px;
    }

    /* Admin table */
    .data-table th,
    .data-table td {
        padding: 8px 6px;
        font-size: 12px;
    }
}