/* ===================================
   CSS RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===================================
   CSS CUSTOM PROPERTIES
   =================================== */
:root {
    /* Colors — Ark UI Dark Theme */
    --color-bg-primary: #0d0d0d;
    --color-bg-secondary: #111111;
    --color-bg-tertiary: #191918;
    --color-bg-card: #111111;
    --color-bg-card-hover: #161616;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #c2410c 0%, #9a3412 100%);
    --gradient-secondary: linear-gradient(135deg, #c2410c 0%, #9a3412 100%);
    --gradient-success: linear-gradient(135deg, #0d9488 0%, #0f766e 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(235, 94, 65, 0.07) 0%, rgba(0, 0, 0, 0) 100%);

    /* Text Colors */
    --color-text-primary: #eeeeec;
    --color-text-secondary: #b5b3ad;
    --color-text-tertiary: #878580;
    --color-text-muted: #63605b;

    /* Accent Colors */
    --color-primary: #c2410c;
    --color-primary-light: #d4521a;
    --color-primary-dark: #9a3412;
    --color-secondary: #a8a29e;
    --color-success: #0d9488;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Status Colors */
    --color-draft: #78716c;
    --color-sent: #3b82f6;
    --color-paid: #0d9488;
    --color-overdue: #ef4444;

    /* Border & Divider */
    --color-border: rgba(73, 72, 68, 0.18);
    --color-border-light: rgba(73, 72, 68, 0.08);
    --color-divider: rgba(73, 72, 68, 0.12);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -2px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8), 0 10px 10px -5px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 24px rgba(194, 65, 12, 0.25);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 70px;
}

/* ===================================
   BASE STYLES
   =================================== */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Login Mode - Hide Sidebar & Header */
body.login-mode .sidebar,
body.login-mode .mobile-header,
body.login-mode .sidebar-overlay {
    display: none !important;
}

body.login-mode .main-content {
    margin-left: 0;
}

body.login-mode .app-container {
    justify-content: center;
}



/* ===================================
   LAYOUT
   =================================== */
.app-container {
    display: none;
    /* Hidden by default to prevent FOUC */
    min-height: 100vh;
    position: relative;
    z-index: 1;
    min-width: 100%;
}

/* ===================================
   LOGIN MODE OVERRIDES
   =================================== */
body.login-mode .sidebar,
body.login-mode .mobile-header,
body.login-mode .sidebar-overlay {
    display: none !important;
}

body.login-mode .main-content {
    margin: 0 !important;
    padding: 0 !important;
    width: 100% !important;
}

body.login-mode .content-wrapper {
    padding: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
}

/* ===================================
   SIDEBAR
   =================================== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: transform var(--transition-base);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 0 var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}



.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: 0 var(--spacing-md);
    flex: 1;
}

/* Clean Nav Item Styles */
.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    position: relative;
}

/* Removed ::before gradient effects */

.nav-item svg {
    position: relative;
    z-index: 1;
    /* Removed transform transition */
}

.nav-item span {
    position: relative;
    z-index: 1;
    font-weight: 500;
}

.nav-item:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.05);
    /* subtle clean hover */
    /* Removed transform */
}

/* Removed svg scale transform on hover */

.nav-item.active {
    color: var(--color-text-primary);
    background: var(--color-primary);
    /* Solid clean active state */
    /* Removed box-shadow and glow */
}

/* Removed active::before */

.nav-item.logout-btn {
    margin-top: auto;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.nav-item.logout-btn::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--spacing-lg));
    left: calc(-1 * var(--spacing-md));
    right: calc(-1 * var(--spacing-md));
    height: 1px;
    background: var(--color-border);
}

/* ===================================
   MAIN CONTENT
   =================================== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.content-wrapper {
    padding: var(--spacing-2xl);
    max-width: 1400px;
    margin: 0 auto;
}

/* ===================================
   CARDS & GLASSMORPHISM
   =================================== */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-divider);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

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

/* ===================================
   STATS CARDS
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-card:hover::before {
    opacity: 0;
}

.stat-card-content {
    position: relative;
    z-index: 1;
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    box-shadow: var(--shadow-glow);
}

.stat-card-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.stat-card-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.stat-card-value {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-text-primary);
    margin: var(--spacing-sm) 0;
    line-height: 1;
}

.stat-card-trend {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    display: none;
}

.btn:hover::before {
    display: none;
}

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

.btn-primary:hover {
    opacity: 0.88;
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    opacity: 0.8;
}

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

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

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-ghost-danger {
    background: var(--color-bg-tertiary);
    color: var(--color-text-tertiary);
    border: 1px solid var(--color-border);
}

.btn-ghost-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
}

.btn-icon {
    padding: 0;
    width: 54px;
    height: 100%;
    flex-shrink: 0;
}

/* Quick create link — appears below selects inside the invoice form */
.quick-create-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: var(--spacing-sm);
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast), opacity var(--transition-fast);
    opacity: 0.85;
}

.quick-create-link:hover {
    color: var(--color-primary);
    opacity: 1;
}

.quick-create-link svg {
    flex-shrink: 0;
}


/* ===================================
   SETTINGS
   =================================== */
.settings-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-divider);
}

/* ===================================
   FORMS
   =================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    height: 45px;
    /* Fix for text clipping: remove vertical padding and rely on height/flex centering or line-height */
    padding: 0 var(--spacing-md);
    line-height: 43px;
    /* Height (45) - Border (2) approx */
    box-sizing: border-box;
    /* Prevent padding from adding to width */
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%239ca3af' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

.margin-bottom-lg {
    margin-bottom: var(--spacing-lg);
}

.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(194, 65, 12, 0.12);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
    height: auto;
}

/* Fix for dark theme calendar icon */
input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--transition-base);
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

/* ===================================
   TABLE
   =================================== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

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

.table thead {
    background: var(--color-bg-tertiary);
}

.table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
}

.table td {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-light);
}

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

.table tbody tr:hover {
    background: var(--color-bg-tertiary);
}

/* ===================================
   BADGES
   =================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
}

.badge-draft {
    background: rgba(107, 114, 128, 0.2);
    color: var(--color-draft);
}

.badge-sent {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-sent);
}

.badge-paid {
    background: rgba(13, 148, 136, 0.2);
    color: var(--color-paid);
}

.badge-overdue {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-overdue);
}



/* ===================================
   TOGGLE SWITCH
   =================================== */
.toggle-switch {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.toggle-input {
    display: none;
}

.toggle-slider {
    width: 36px;
    height: 20px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    position: relative;
    transition: all var(--transition-fast);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: var(--color-text-tertiary);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.toggle-input:checked+.toggle-slider {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.toggle-input:checked+.toggle-slider::after {
    transform: translateX(16px);
    background: white;
}

.toggle-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===================================
   MODAL
   =================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    max-width: 1100px;
    width: 95%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-divider);
}

.modal-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.modal-close:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
}

/* ===================================
   UTILITIES
   =================================== */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 {
    margin-top: var(--spacing-md);
}

.mt-2 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-md);
}

.mb-2 {
    margin-bottom: var(--spacing-lg);
}

.flex {
    display: flex;
}

/* ===================================
   GRID LAYOUTS
   =================================== */
.invoice-dates-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

/* ===================================
   INPUT GROUPS
   =================================== */
.input-group {
    display: flex;
    align-items: stretch;
}

.input-group-text {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-right: 0;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    color: var(--color-text-secondary);
    font-weight: 600;
    min-width: 3.5rem;
    font-size: var(--font-size-lg);
}

.input-group .form-input {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    flex: 1;
}

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

.gap-1 {
    gap: var(--spacing-md);
}

.gap-2 {
    gap: var(--spacing-lg);
}

.invoice-controls-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
}

.invoice-filters {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.invoice-search-wrapper {
    position: relative;
    width: 250px;
    flex-shrink: 0;
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

/* ===================================
   RESPONSIVE
   =================================== */
/* Responsive Styles */

/* Mobile Header */
.mobile-header {
    display: none;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 40;
}

.mobile-header h1 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mobile-menu-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    width: 48px;
    height: 48px;
}

.mobile-menu-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border-color: var(--color-primary);
}

.mobile-menu-btn svg {
    width: 28px;
    height: 28px;
}

/* Sidebar Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: all;
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    /* Sidebar Mobile */
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
    }

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

    /* Main Content Mobile */
    .main-content {
        margin-left: 0;
        width: 100%;
    }

    .content-wrapper {
        padding: var(--spacing-md);
    }

    /* Mobile Header Visible */
    .mobile-header {
        display: flex;
    }

    /* Grid Layouts to Single Column */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .form-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Responsive Invoice Filters */
    .invoice-controls-card {
        flex-direction: column;
        align-items: stretch;
    }

    .invoice-filters {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: var(--spacing-xs);
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        /* Firefox */
    }

    .invoice-filters::-webkit-scrollbar {
        display: none;
        /* Chrome/Safari */
    }

    .invoice-filters .btn {
        flex-shrink: 0;
    }

    .invoice-search-wrapper {
        width: 100%;
        margin-top: var(--spacing-sm);
    }

    /* Tables Responsive Layout (Stacked) */
    .table-container {
        border: none;
        border-radius: 0;
        overflow-x: hidden;
        background: transparent;
    }

    .table,
    .table tbody {
        display: block;
        width: 100%;
    }

    .table thead {
        display: none;
    }

    .table tr {
        display: block;
        margin-bottom: var(--spacing-lg);
        background: var(--color-bg-secondary);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        padding: var(--spacing-md);
    }

    .table tr:last-child {
        margin-bottom: 0;
    }

    .table th,
    .table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        text-align: right;
        border-bottom: 1px solid var(--color-border);
        white-space: normal;
        padding: var(--spacing-sm) 0;
    }

    .table td:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }

    .table td:first-child {
        padding-top: 0;
    }

    .table td::before {
        content: attr(data-label);
        font-weight: 600;
        text-align: left;
        color: var(--color-text-secondary);
        font-size: var(--font-size-sm);
        text-transform: uppercase;
        letter-spacing: 0.05em;
        margin-right: var(--spacing-sm);
    }

    /* Hide Actions label to save space and center align the action buttons */
    .table td[data-label="Actions"]::before {
        display: none;
    }

    .table td[data-label="Actions"] {
        justify-content: center;
        padding-top: var(--spacing-md);
    }

    .table td[data-label="Actions"]>div {
        justify-content: center !important;
        width: 100%;
        flex-wrap: wrap;
    }

    /* Adjust Modal */
    .modal {
        width: 100%;
        height: 100%;
        max-height: 100%;
        border-radius: 0;
    }

    /* Make confirmation modal fit properly instead of stretching the entire screen on mobile if desired, or at least have padding */
    #confirmModal {
        width: 90%;
        max-width: 400px;
        height: auto;
        min-height: auto;
        border-radius: var(--radius-2xl);
    }

    #confirmMessage {
        word-wrap: break-word;
        white-space: normal;
        padding: 0 var(--spacing-sm);
    }

    .modal-header {
        padding: var(--spacing-md);
    }

    .modal-body {
        padding: var(--spacing-md);
    }

    /* Adjust Card Headers */
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .card-header .btn {
        width: 100%;
        margin-top: var(--spacing-sm);
        /* Add spacing between title and button */
    }

    .settings-actions {
        justify-content: center;
    }

    /* Mobile Button Sizing */
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-xs);
        height: auto;
        min-height: 40px;
        /* SLightly reduce min-height if font is smaller, but 44 is good for touch. Let's keep 40-44 */
    }

    /* Invoice Modal Responsive */
    .invoice-dates-grid {
        grid-template-columns: 1fr;
        /* Stack vertically (1 by 1) */
        gap: var(--spacing-md);
        width: 100%;
    }

    .invoice-dates-grid .form-input,
    .invoice-dates-grid .form-select {
        width: 100% !important;
        max-width: 100% !important;
        /* Prevent overflow */
        box-sizing: border-box !important;
        min-width: 0;
        /* Allow shrinking */
        -webkit-appearance: none;
        appearance: none;
        /* Remove iOS native styling */
    }

    .invoice-dates-grid .form-group:nth-child(3) {
        grid-column: auto;
        /* Status follows natural flow */
    }

    /* Stack Invoice Number and Client on mobile */
    .form-grid-2 {
        grid-template-columns: 1fr;
    }

    /* Remove Item Button Mobile */
    .invoice-item {
        grid-template-columns: 1fr 1fr auto !important;
        /* Stack fields differently if needed, but keeping simple for now or just adjusting button */
        /* Actually, let's keep the item grid as is but adjust the button */
        position: relative;
    }

    .invoice-item .btn-icon {
        width: 32px;
        height: 32px;
        border: 1px solid var(--color-border) !important;
        background: var(--color-bg-primary) !important;
        padding: 4px;
        position: absolute;
        top: 10px;
        right: 10px;
        z-index: 10;
    }

    .invoice-item .btn-icon svg {
        width: 16px;
        height: 16px;
    }

    /* Adjust invoice item layout for mobile to accommodate absolute button */
    .invoice-item {
        display: flex !important;
        flex-direction: column;
        gap: var(--spacing-sm) !important;
        padding-top: 70px !important;
        /* Space for the delete button */
    }

    /* Reset margins on form groups inside invoice item */
    .invoice-item .form-group {
        width: 100%;
    }
}

/* Image Upload Modernization */
.image-upload-box {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: rgba(0, 0, 0, 0.02);
    position: relative;
    overflow: hidden;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ===================================
   TOAST NOTIFICATIONS
   =================================== */
#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.toast.success {
    border-left-color: var(--color-success);
}

.toast.error {
    border-left-color: var(--color-danger);
}

.toast-icon {
    flex-shrink: 0;
}

.toast.success .toast-icon {
    color: var(--color-success);
}

.toast.error .toast-icon {
    color: var(--color-danger);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateX(20px);
    }
}

.image-upload-box:hover {
    border-color: var(--color-primary);
    background: rgba(194, 65, 12, 0.05);
}

.upload-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    transition: transform var(--transition-base);
}

.image-upload-box:hover .upload-icon {
    transform: scale(1.1);
    color: var(--color-primary);
}

.upload-text {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.upload-preview-image {
    max-width: 100%;
    max-height: 150px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.upload-actions {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* ===================================
   LOADING SPINNER
   =================================== */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(194, 65, 12, 0.25);
    border-radius: 50%;
    border-top-color: var(--color-primary);
    animation: spin 1s ease-in-out infinite;
    margin: 0 auto;
}

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

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    background: var(--color-bg-primary);
    z-index: 50;
}