/* ============================================
   SISTEMA DE INVENTARIO - DESIGN SYSTEM
   Modern, Professional CSS with Dark Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---- CSS VARIABLES ---- */
:root {
    /* Colors - Sophisticated Dark Palette */
    --bg-primary: #0f1117;
    --bg-secondary: #161822;
    --bg-tertiary: #1e2030;
    --bg-card: #1a1c2e;
    --bg-hover: #252840;
    --bg-input: #1a1c2e;

    --border-color: #2a2d42;
    --border-light: #353850;

    --text-primary: #e8eaf0;
    --text-secondary: #9ca3b8;
    --text-muted: #6b7290;
    --text-white: #ffffff;

    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-primary-glow: rgba(99, 102, 241, 0.15);
    --accent-secondary: #06b6d4;
    --accent-success: #22c55e;
    --accent-success-bg: rgba(34, 197, 94, 0.1);
    --accent-warning: #f59e0b;
    --accent-warning-bg: rgba(245, 158, 11, 0.1);
    --accent-danger: #ef4444;
    --accent-danger-bg: rgba(239, 68, 68, 0.1);
    --accent-danger-hover: #dc2626;
    --accent-info: #3b82f6;
    --accent-info-bg: rgba(59, 130, 246, 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-xs: 0.75rem;
    --font-sm: 0.8125rem;
    --font-base: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 0.75rem;
    --space-base: 1rem;
    --space-lg: 1.25rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 3rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed: 0px;
    --header-height: 64px;
}

/* ---- LIGHT THEME ---- */
:root[data-theme="light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef1f6;
    --bg-card: #ffffff;
    --bg-hover: #f0f2f7;
    --bg-input: #f8f9fb;

    --border-color: #dfe3eb;
    --border-light: #cdd3de;

    --text-primary: #1a1d2e;
    --text-secondary: #4a5068;
    --text-muted: #8892a8;
    --text-white: #111827;

    /* Accent Colors (slightly adjusted for contrast on light) */
    --accent-primary: #5b5ff0;
    --accent-primary-hover: #4f46e5;
    --accent-primary-glow: rgba(91, 95, 240, 0.1);

    /* Shadows (lighter) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(91, 95, 240, 0.12);
}

/* Smooth theme transition */
body,
.sidebar,
.header,
.card,
.kpi-card,
.table-container,
.form-container,
.form-control,
.modal,
.btn-outline,
.nav-link {
    transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}

/* Show/hide icons based on theme */
:root[data-theme="light"] #themeToggleBtn .icon-moon { display: block; }
:root[data-theme="light"] #themeToggleBtn .icon-sun  { display: none; }
:root:not([data-theme="light"]) #themeToggleBtn .icon-moon { display: none; }
:root:not([data-theme="light"]) #themeToggleBtn .icon-sun  { display: block; }

/* ---- RESET & BASE ---- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

a {
    color: var(--accent-primary-hover);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary);
}

/* ---- LAYOUT ---- */
.app-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-areas:
        "sidebar header"
        "sidebar main";
    min-height: 100vh;
}

/* ---- SIDEBAR ---- */
.sidebar {
    grid-area: sidebar;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-base);
}

.sidebar-header {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    height: var(--header-height);
}

.sidebar-logo {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-logo svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.sidebar-brand {
    font-size: var(--font-md);
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: -0.02em;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-base) 0;
    overflow-y: auto;
}

.nav-section {
    margin-bottom: var(--space-lg);
}

.nav-section-title {
    padding: var(--space-sm) var(--space-xl);
    font-size: var(--font-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-xl);
    color: var(--text-secondary);
    font-size: var(--font-base);
    font-weight: 500;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    cursor: pointer;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.nav-link.active {
    color: var(--accent-primary-hover);
    background: var(--accent-primary-glow);
    border-left-color: var(--accent-primary);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-link.active svg,
.nav-link:hover svg {
    opacity: 1;
}

.sidebar-footer {
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-color);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.sidebar-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent-primary), #a855f7);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-sm);
    color: white;
    flex-shrink: 0;
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-role {
    font-size: var(--font-xs);
    color: var(--text-muted);
}

/* ---- HEADER ---- */
.header {
    grid-area: header;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-2xl);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-base);
}

.header-title {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: -0.02em;
}

.header-subtitle {
    font-size: var(--font-sm);
    color: var(--text-muted);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-base);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
}

.mobile-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.mobile-toggle svg {
    width: 24px;
    height: 24px;
}

/* ---- MAIN CONTENT ---- */
.main-content {
    grid-area: main;
    padding: var(--space-2xl);
    overflow-y: auto;
    max-width: 100%;
}

/* ---- PAGE HEADER ---- */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
    gap: var(--space-base);
}

.page-title {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: -0.02em;
}

.page-title span {
    color: var(--accent-primary-hover);
}

/* ---- CARDS ---- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    border-color: var(--border-light);
}

/* KPI Cards Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    padding-right: 4.5rem;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    min-height: 90px;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.kpi-card.kpi-primary::before { background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary)); }
.kpi-card.kpi-success::before { background: linear-gradient(90deg, var(--accent-success), #34d399); }
.kpi-card.kpi-warning::before { background: linear-gradient(90deg, var(--accent-warning), #fbbf24); }
.kpi-card.kpi-info::before { background: linear-gradient(90deg, var(--accent-info), #60a5fa); }

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

.kpi-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
}

.kpi-primary .kpi-icon { background: var(--accent-primary-glow); color: var(--accent-primary-hover); }
.kpi-success .kpi-icon { background: var(--accent-success-bg); color: var(--accent-success); }
.kpi-warning .kpi-icon { background: var(--accent-warning-bg); color: var(--accent-warning); }
.kpi-info .kpi-icon { background: var(--accent-info-bg); color: var(--accent-info); }

.kpi-icon svg {
    width: 22px;
    height: 22px;
}

.kpi-content {
    flex: 1;
    min-width: 0;
}

.kpi-label {
    font-size: var(--font-sm);
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.7rem;
}

.kpi-value {
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    font-weight: 800;
    color: var(--text-white);
    letter-spacing: -0.03em;
    line-height: 1.2;
    word-break: break-word;
}

/* ---- TABLES ---- */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    overflow-x: auto;
}

.table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: var(--space-base);
}

.table-title {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-white);
}

.table-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

thead th {
    padding: var(--space-md) var(--space-xl);
    text-align: left;
    font-size: var(--font-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

tbody td {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-base);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

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

tbody tr:hover {
    background: var(--bg-hover);
}

tbody tr:last-child td {
    border-bottom: none;
}

.td-primary {
    color: var(--text-primary);
    font-weight: 500;
}

.td-mono {
    font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
    font-size: var(--font-sm);
}

.table-empty {
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
    color: var(--text-muted);
}

.table-empty svg {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-base);
    opacity: 0.3;
}

/* ---- BADGES ---- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: var(--font-xs);
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.badge-primary { background: var(--accent-primary-glow); color: var(--accent-primary-hover); }
.badge-success { background: var(--accent-success-bg); color: var(--accent-success); }
.badge-warning { background: var(--accent-warning-bg); color: var(--accent-warning); }
.badge-danger { background: var(--accent-danger-bg); color: var(--accent-danger); }
.badge-info { background: var(--accent-info-bg); color: var(--accent-info); }

.badge-operation {
    width: 26px;
    height: 26px;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-md);
}

.badge-operation.op-add { background: var(--accent-success-bg); color: var(--accent-success); }
.badge-operation.op-sub { background: var(--accent-danger-bg); color: var(--accent-danger); }

/* ---- BUTTONS ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-base);
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.4;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* ---- NOTIFICATIONS ---- */
.notification-bell {
    background: transparent;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.notification-bell:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.notification-bell.has-alerts {
    color: var(--accent-danger);
}

.notification-bell.has-alerts:hover {
    color: var(--text-white);
    background: var(--accent-danger-bg);
}

.notification-dropdown {
    transform-origin: top right;
    transition: all var(--transition-fast) ease-out;
}

.notification-dropdown a:hover {
    text-decoration: underline;
}

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

.btn-primary:hover {
    background: var(--accent-primary-hover);
    border-color: var(--accent-primary-hover);
    box-shadow: var(--shadow-glow);
    color: white;
}

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

.btn-success:hover {
    background: #16a34a;
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.2);
    color: white;
}

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

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

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

.btn-outline:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-sm);
    border-radius: var(--radius-sm);
}

.btn-sm svg {
    width: 16px;
    height: 16px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-sm);
}

.btn-icon.btn-sm {
    width: 30px;
    height: 30px;
}

.btn-group {
    display: flex;
    gap: var(--space-sm);
}

/* ---- FORMS ---- */
.form-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    max-width: 700px;
}

.form-container.form-wide {
    max-width: 1200px;
}

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

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

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

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.form-group label .required {
    color: var(--accent-danger);
}

.form-control {
    width: 100%;
    padding: var(--space-md) var(--space-base);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-control:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

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

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7290' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

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

.form-help {
    font-size: var(--font-xs);
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

.form-error {
    font-size: var(--font-xs);
    color: var(--accent-danger);
    margin-top: var(--space-xs);
}

.form-actions {
    display: flex;
    gap: var(--space-base);
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
}

/* ---- TOGGLE SWITCH ---- */
.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--space-base);
    cursor: pointer;
    user-select: none;
    padding: var(--space-md) 0;
}

.toggle-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
}

.toggle-switch input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-track {
    width: 44px;
    height: 24px;
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    padding: 2px;
}

.toggle-thumb {
    width: 18px;
    height: 18px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: all var(--transition-base);
    transform: translateX(0);
}

.toggle-switch input[type="checkbox"]:checked ~ .toggle-track {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-switch input[type="checkbox"]:checked ~ .toggle-track .toggle-thumb {
    background: white;
    transform: translateX(20px);
}

.toggle-switch input[type="checkbox"]:focus ~ .toggle-track {
    box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.toggle-text {
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-secondary);
}

/* ---- DETAIL ROWS (Inline formsets) ---- */
.detail-rows {
    margin-top: var(--space-xl);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.detail-rows-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-base) var(--space-lg);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.detail-rows-title {
    font-size: var(--font-base);
    font-weight: 600;
    color: var(--text-primary);
}

.detail-row {
    display: grid;
    grid-template-columns: 2fr 2fr 2fr 1fr 1fr auto;
    gap: var(--space-md);
    padding: var(--space-base) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    align-items: end;
}

.detail-row:last-child {
    border-bottom: none;
}

.detail-row .form-group {
    margin-bottom: 0;
}

.detail-row .form-control {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-sm);
}

.detail-row .btn-remove {
    align-self: end;
    margin-bottom: 2px;
}

/* ---- ALERTS / MESSAGES ---- */
.alerts-container {
    margin-bottom: var(--space-xl);
}

.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-base) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-base);
    border: 1px solid transparent;
    margin-bottom: var(--space-sm);
    animation: slideDown 0.3s ease;
}

.alert svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 1px;
}

.alert-success {
    background: var(--accent-success-bg);
    color: var(--accent-success);
    border-color: rgba(34, 197, 94, 0.2);
}

.alert-error,
.alert-danger {
    background: var(--accent-danger-bg);
    color: var(--accent-danger);
    border-color: rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: var(--accent-warning-bg);
    color: var(--accent-warning);
    border-color: rgba(245, 158, 11, 0.2);
}

.alert-info {
    background: var(--accent-info-bg);
    color: var(--accent-info);
    border-color: rgba(59, 130, 246, 0.2);
}

.alert-close {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    opacity: 0.6;
    font-size: var(--font-lg);
    line-height: 1;
}

.alert-close:hover {
    opacity: 1;
}

/* ---- MODAL ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    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(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    max-width: 440px;
    width: 90%;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-title {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--space-sm);
}

.modal-body {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    font-size: var(--font-base);
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: var(--space-base);
    justify-content: flex-end;
}

/* ---- SEARCH INPUT ---- */
.search-input-wrapper {
    position: relative;
}

.search-input-wrapper svg {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    padding-left: 40px !important;
    width: 260px;
}

/* ---- FILTER BAR ---- */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--space-base);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.filter-bar .form-control {
    width: auto;
    min-width: 180px;
    padding: var(--space-sm) var(--space-base);
    font-size: var(--font-sm);
}

/* ---- FLOATING ACTION BUTTON (EXPANDABLE) ---- */
.fab-container {
    display: block;
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
}

.fab-mobile {
    display: flex;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.45);
    justify-content: center;
    align-items: center;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s;
    text-decoration: none;
    position: relative;
    z-index: 1002;
}

.fab-mobile:hover, .fab-mobile:active {
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
    color: white;
}

.fab-mobile svg {
    width: 28px;
    height: 28px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.fab-mobile.fab-open svg {
    transform: rotate(45deg);
}

/* Backdrop */
.fab-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.fab-backdrop.fab-backdrop-visible {
    opacity: 1;
    pointer-events: all;
}

/* Sub-options container */
.fab-options {
    position: absolute;
    bottom: 72px;
    right: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-end;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
    z-index: 1001;
}

.fab-options.fab-options-visible {
    opacity: 1;
    pointer-events: all;
}

/* Each sub-option */
.fab-option {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    outline: none;
    opacity: 0;
    transform: translateY(16px) scale(0.8);
    transition: opacity 0.25s, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.fab-options-visible .fab-option {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.fab-options-visible .fab-option:nth-child(1) { transition-delay: 0.08s; }
.fab-options-visible .fab-option:nth-child(2) { transition-delay: 0.04s; }
.fab-options-visible .fab-option:nth-child(3) { transition-delay: 0s; }

.fab-option-label {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.fab-option-icon {
    display: flex;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    justify-content: center;
    align-items: center;
    color: white;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
    flex-shrink: 0;
}

.fab-option-icon svg { width: 20px; height: 20px; }

/* Color variants */
.fab-option-gasto .fab-option-icon { background: linear-gradient(135deg, #ef4444, #dc2626); }
.fab-option-ingreso .fab-option-icon { background: linear-gradient(135deg, #22c55e, #16a34a); }
.fab-option-transfer .fab-option-icon { background: linear-gradient(135deg, #3b82f6, #2563eb); }

.fab-option:active .fab-option-icon { transform: scale(0.92); }



/* ---- LOGIN PAGE ---- */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-primary);
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-primary-glow) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    pointer-events: none;
}

.login-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    pointer-events: none;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl);
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-lg);
}

.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.login-logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-logo-icon svg {
    width: 28px;
    height: 28px;
    fill: white;
}

.login-title {
    font-size: var(--font-2xl);
    font-weight: 800;
    color: var(--text-white);
    letter-spacing: -0.03em;
}

.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: var(--font-base);
    margin-bottom: var(--space-2xl);
}

.login-card .form-group {
    margin-bottom: var(--space-lg);
}

.login-card .btn-primary {
    width: 100%;
    padding: var(--space-base);
    font-size: var(--font-md);
}

.login-error {
    background: var(--accent-danger-bg);
    color: var(--accent-danger);
    padding: var(--space-md) var(--space-base);
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    margin-bottom: var(--space-lg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    text-align: center;
}

/* ---- STOCK INDICATORS ---- */
.stock-ok {
    color: var(--accent-success);
    font-weight: 600;
}

.stock-low {
    color: var(--accent-warning);
    font-weight: 600;
}

.stock-critical {
    color: var(--accent-danger);
    font-weight: 700;
}

/* ---- DETAIL VIEW (Invoice detail, etc.) ---- */
.detail-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.detail-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.detail-card-header h2 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-white);
}

.detail-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    padding: var(--space-xl);
}

.detail-info-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.detail-info-label {
    font-size: var(--font-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.detail-info-value {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-white);
}

.detail-info-value.value-highlight {
    color: var(--accent-success);
    font-size: var(--font-xl);
}

/* ---- UTILITY ---- */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--accent-success); }
.text-danger { color: var(--accent-danger); }
.text-warning { color: var(--accent-warning); }
.font-mono { font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace; }
.mt-1 { margin-top: var(--space-base); }
.mt-2 { margin-top: var(--space-xl); }
.mb-1 { margin-bottom: var(--space-base); }
.mb-2 { margin-bottom: var(--space-xl); }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-1 { gap: var(--space-base); }
.flex-1 { flex: 1; }

/* ---- ANIMATIONS ---- */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.fade-in {
    animation: fadeIn 0.4s ease;
}

/* ---- PAGINATION ---- */
.pagination-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: var(--space-base);
}

.pagination-info {
    font-size: var(--font-sm);
    color: var(--text-muted);
}

.pagination {
    display: flex;
    align-items: center;
    gap: 4px;
}

.pagination-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--space-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.pagination-btn:hover:not(.disabled):not(.active) {
    background: var(--bg-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.pagination-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    font-weight: 700;
}

.pagination-btn.disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    font-size: var(--font-sm);
    color: var(--text-muted);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main";
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        display: none;
    }

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

    .mobile-toggle {
        display: flex;
    }

    .main-content {
        padding: var(--space-base);
    }

    .page-header {
        flex-direction: column;
        align-items: stretch;
    }

    .page-header .btn {
        width: 100%;
        margin-top: var(--space-sm);
        justify-content: center;
    }

    .form-control {
        font-size: 16px !important; /* Previene el zoom automático en iOS */
        padding: 12px var(--space-base);
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .form-actions .btn {
        width: 100%;
        margin-bottom: var(--space-sm);
    }

    .btn:not(.btn-sm):not(.btn-icon) {
        min-height: 48px; /* Tamaño táctil adecuado */
    }

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

    .form-grid {
        grid-template-columns: minmax(0, 1fr);
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    input[type="datetime-local"].form-control,
    input[type="date"].form-control {
        max-width: 100%;
        padding-left: 8px;
        padding-right: 8px;
    }

    .detail-row {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-sm);
    }

    /* Rediseño de Tablas a Tarjetas en Dispositivos Móviles */
    .table-container {
        background: transparent;
        border: none;
        border-radius: 0;
        overflow: visible;
    }

    .table-container table,
    .table-container thead,
    .table-container tbody,
    .table-container th,
    .table-container td,
    .table-container tr {
        display: block;
        width: 100%;
    }

    .table-container thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }

    .table-container tr {
        margin-bottom: var(--space-lg);
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-lg);
        padding: var(--space-base);
    }

    .table-container td {
        border-bottom: 2px dashed rgba(255, 255, 255, 0.05);
        padding: var(--space-sm) 0;
        text-align: right;
        display: flex;
        justify-content: space-between;
        align-items: center;
        min-height: 48px;
    }

    .table-container td:last-child {
        border-bottom: none;
        padding-bottom: 0;
        margin-top: var(--space-sm);
        justify-content: flex-end;
    }

    .table-container td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--text-muted);
        text-transform: uppercase;
        font-size: 0.75rem;
        margin-right: var(--space-base);
        text-align: left;
    }

    .table-container td:empty::before {
        display: none;
    }

    /* Resaltar visualmente siempre el primer elemento del tr (Nombre, Número) */
    .table-container td.td-primary,
    .table-container td:first-child {
        font-size: var(--font-lg) !important;
        font-weight: 700;
        color: var(--accent-primary-hover);
        text-align: left;
        display: block;
        padding-bottom: var(--space-sm);
        border-bottom: 1px solid var(--border-color);
        margin-bottom: var(--space-sm);
    }

    .table-container td.td-primary::before,
    .table-container td:first-child::before {
        display: block;
        margin-bottom: var(--space-xs);
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-bar .form-control {
        width: 100%;
    }

    .search-input {
        width: 100% !important;
    }

    .header {
        padding: 0 var(--space-base);
    }

    .header-subtitle {
        display: none;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: var(--space-xl);
    }

    .login-title {
        font-size: var(--font-xl);
    }

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

    .btn-group {
        flex-direction: column;
    }
}