/* ============================================
   OnePlatform Design System
   Enterprise Education ERP Theme
   Version: 2.0
   ============================================ */

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

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */

:root,
html.light,
[data-theme="light"] {
    /* Brand Colors */
    --op-primary: #1EA7FD;
    --op-primary-hover: #0D8FE5;
    --op-primary-active: #0A7BC9;
    --op-primary-light: rgba(30, 167, 253, 0.1);
    --op-primary-dark: #0F4C81;
    --op-primary-rgb: 30, 167, 253;

    --op-secondary: #1EC8A5;
    --op-secondary-hover: #17A88A;
    --op-secondary-light: rgba(30, 200, 165, 0.1);
    --op-secondary-rgb: 30, 200, 165;

    /* Semantic Colors */
    --op-info: #00C6FF;
    --op-info-light: rgba(0, 198, 255, 0.1);
    --op-info-rgb: 0, 198, 255;
    
    --op-success: #22C55E;
    --op-success-light: rgba(34, 197, 94, 0.1);
    --op-success-rgb: 34, 197, 94;
    
    --op-warning: #F59E0B;
    --op-warning-light: rgba(245, 158, 11, 0.1);
    --op-warning-rgb: 245, 158, 11;
    
    --op-error: #EF4444;
    --op-error-light: rgba(239, 68, 68, 0.1);
    --op-error-rgb: 239, 68, 68;

    /* Neutral Colors - Light Mode */
    --op-bg-page: #F8FAFC;
    --op-bg-surface: #FFFFFF;
    --op-bg-surface-elevated: #FFFFFF;
    --op-bg-hover: #F1F5F9;
    --op-bg-active: #E2E8F0;
    --op-bg-sidebar: #FFFFFF;
    --op-bg-topbar: #FFFFFF;

    /* Border Colors */
    --op-border: #E2E8F0;
    --op-border-light: #F1F5F9;
    --op-border-focus: var(--op-primary);

    /* Text Colors */
    --op-text-primary: #1E293B;
    --op-text-secondary: #64748B;
    --op-text-tertiary: #94A3B8;
    --op-text-inverse: #FFFFFF;
    --op-text-link: var(--op-primary);

    /* Shadows */
    --op-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --op-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --op-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --op-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --op-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --op-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --op-shadow-card-hover: 0 8px 25px rgba(0, 0, 0, 0.1);

    /* Overlay */
    --op-overlay: rgba(15, 23, 42, 0.5);
}

/* Dark Mode */
html.dark,
[data-theme="dark"] {
    /* Brand Colors (adjusted for dark) */
    --op-primary: #38BDF8;
    --op-primary-hover: #1EA7FD;
    --op-primary-active: #0D8FE5;
    --op-primary-light: rgba(56, 189, 248, 0.15);
    --op-primary-dark: #0F4C81;
    --op-primary-rgb: 56, 189, 248;

    --op-secondary: #2DD4BF;
    --op-secondary-hover: #1EC8A5;
    --op-secondary-light: rgba(45, 212, 191, 0.15);
    --op-secondary-rgb: 45, 212, 191;

    /* Semantic Colors (brighter for dark) */
    --op-info: #38BDF8;
    --op-info-light: rgba(56, 189, 248, 0.15);
    --op-info-rgb: 56, 189, 248;
    
    --op-success: #4ADE80;
    --op-success-light: rgba(74, 222, 128, 0.15);
    --op-success-rgb: 74, 222, 128;
    
    --op-warning: #FBBF24;
    --op-warning-light: rgba(251, 191, 36, 0.15);
    --op-warning-rgb: 251, 191, 36;
    
    --op-error: #F87171;
    --op-error-light: rgba(248, 113, 113, 0.15);
    --op-error-rgb: 248, 113, 113;

    /* Neutral Colors - Dark Mode */
    --op-bg-page: #0F172A;
    --op-bg-surface: #1E293B;
    --op-bg-surface-elevated: #334155;
    --op-bg-hover: #334155;
    --op-bg-active: #475569;
    --op-bg-sidebar: #1E293B;
    --op-bg-topbar: #1E293B;

    /* Border Colors */
    --op-border: #334155;
    --op-border-light: #1E293B;
    --op-border-focus: var(--op-primary);

    /* Text Colors */
    --op-text-primary: #F1F5F9;
    --op-text-secondary: #94A3B8;
    --op-text-tertiary: #64748B;
    --op-text-inverse: #0F172A;
    --op-text-link: var(--op-primary);

    /* Shadows (subtle in dark mode) */
    --op-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --op-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --op-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --op-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --op-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --op-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --op-shadow-card-hover: 0 8px 25px rgba(0, 0, 0, 0.4);

    /* Overlay */
    --op-overlay: rgba(0, 0, 0, 0.7);
}

/* ============================================
   Design Tokens - Spacing & Sizing
   ============================================ */

:root {
    /* Spacing Scale (8px grid) */
    --op-space-0: 0;
    --op-space-1: 0.25rem;   /* 4px */
    --op-space-2: 0.5rem;    /* 8px */
    --op-space-3: 0.75rem;   /* 12px */
    --op-space-4: 1rem;      /* 16px */
    --op-space-5: 1.25rem;   /* 20px */
    --op-space-6: 1.5rem;    /* 24px */
    --op-space-8: 2rem;      /* 32px */
    --op-space-10: 2.5rem;   /* 40px */
    --op-space-12: 3rem;     /* 48px */
    --op-space-16: 4rem;     /* 64px */
    --op-space-20: 5rem;     /* 80px */

    /* Border Radius */
    --op-radius-sm: 4px;
    --op-radius-md: 8px;
    --op-radius-lg: 12px;
    --op-radius-xl: 16px;
    --op-radius-2xl: 24px;
    --op-radius-full: 9999px;

    /* Typography */
    --op-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --op-font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    /* Font Sizes */
    --op-text-xs: 0.75rem;     /* 12px */
    --op-text-sm: 0.875rem;    /* 14px */
    --op-text-base: 1rem;      /* 16px */
    --op-text-lg: 1.125rem;    /* 18px */
    --op-text-xl: 1.25rem;     /* 20px */
    --op-text-2xl: 1.5rem;     /* 24px */
    --op-text-3xl: 2rem;       /* 32px */
    --op-text-4xl: 2.625rem;   /* 42px */

    /* Font Weights */
    --op-font-light: 300;
    --op-font-regular: 400;
    --op-font-medium: 500;
    --op-font-semibold: 600;
    --op-font-bold: 700;
    --op-font-extrabold: 800;

    /* Line Heights */
    --op-leading-tight: 1.25;
    --op-leading-normal: 1.5;
    --op-leading-relaxed: 1.75;

    /* Layout */
    --op-sidebar-width: 280px;
    --op-sidebar-collapsed-width: 72px;
    --op-topbar-height: 64px;
    --op-content-max-width: 1400px;

    /* Transitions */
    --op-transition-fast: 150ms ease;
    --op-transition-base: 200ms ease;
    --op-transition-slow: 300ms ease;
    --op-transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index Scale */
    --op-z-dropdown: 100;
    --op-z-sticky: 200;
    --op-z-fixed: 300;
    --op-z-modal-backdrop: 400;
    --op-z-modal: 500;
    --op-z-popover: 600;
    --op-z-tooltip: 700;
    --op-z-toast: 800;
}

/* ============================================
   Base Reset & Styles
   ============================================ */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    font-family: var(--op-font-family);
    font-size: var(--op-text-base);
    font-weight: var(--op-font-regular);
    line-height: var(--op-leading-normal);
    color: var(--op-text-primary);
    background-color: var(--op-bg-page);
    transition: background-color var(--op-transition-base), color var(--op-transition-base);
}

/* ============================================
   Typography
   ============================================ */

h1, .op-h1 {
    font-size: var(--op-text-4xl);
    font-weight: var(--op-font-bold);
    line-height: var(--op-leading-tight);
    color: var(--op-text-primary);
    margin: 0 0 var(--op-space-4);
    letter-spacing: -0.02em;
}

h2, .op-h2 {
    font-size: var(--op-text-3xl);
    font-weight: var(--op-font-semibold);
    line-height: var(--op-leading-tight);
    color: var(--op-text-primary);
    margin: 0 0 var(--op-space-4);
    letter-spacing: -0.01em;
}

h3, .op-h3 {
    font-size: var(--op-text-2xl);
    font-weight: var(--op-font-semibold);
    line-height: var(--op-leading-tight);
    color: var(--op-text-primary);
    margin: 0 0 var(--op-space-3);
}

h4, .op-h4 {
    font-size: var(--op-text-xl);
    font-weight: var(--op-font-semibold);
    line-height: var(--op-leading-normal);
    color: var(--op-text-primary);
    margin: 0 0 var(--op-space-3);
}

h5, .op-h5 {
    font-size: var(--op-text-lg);
    font-weight: var(--op-font-semibold);
    line-height: var(--op-leading-normal);
    color: var(--op-text-primary);
    margin: 0 0 var(--op-space-2);
}

h6, .op-h6 {
    font-size: var(--op-text-base);
    font-weight: var(--op-font-semibold);
    line-height: var(--op-leading-normal);
    color: var(--op-text-primary);
    margin: 0 0 var(--op-space-2);
}

p, .op-body {
    font-size: var(--op-text-base);
    line-height: var(--op-leading-normal);
    color: var(--op-text-secondary);
    margin: 0 0 var(--op-space-4);
}

.op-body-sm {
    font-size: var(--op-text-sm);
}

.op-caption {
    font-size: var(--op-text-xs);
    color: var(--op-text-tertiary);
}

.op-overline {
    font-size: var(--op-text-xs);
    font-weight: var(--op-font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--op-text-tertiary);
}

a {
    color: var(--op-text-link);
    text-decoration: none;
    transition: color var(--op-transition-fast);
}

a:hover {
    color: var(--op-primary-hover);
    text-decoration: underline;
}

/* ============================================
   Buttons
   ============================================ */

.op-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--op-space-2);
    padding: var(--op-space-2) var(--op-space-4);
    font-family: var(--op-font-family);
    font-size: var(--op-text-sm);
    font-weight: var(--op-font-medium);
    line-height: 1.5;
    border: 1px solid transparent;
    border-radius: var(--op-radius-md);
    cursor: pointer;
    transition: all var(--op-transition-base);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}

.op-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--op-primary-rgb), 0.3);
}

.op-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Sizes */
.op-btn-xs {
    padding: var(--op-space-1) var(--op-space-2);
    font-size: var(--op-text-xs);
}

.op-btn-sm {
    padding: var(--op-space-1) var(--op-space-3);
    font-size: var(--op-text-sm);
}

.op-btn-lg {
    padding: var(--op-space-3) var(--op-space-6);
    font-size: var(--op-text-base);
}

.op-btn-xl {
    padding: var(--op-space-4) var(--op-space-8);
    font-size: var(--op-text-lg);
}

/* Primary Button */
.op-btn-primary {
    background-color: var(--op-primary);
    color: var(--op-text-inverse);
    box-shadow: 0 1px 3px rgba(var(--op-primary-rgb), 0.3);
}

.op-btn-primary:hover:not(:disabled) {
    background-color: var(--op-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--op-primary-rgb), 0.4);
}

.op-btn-primary:active:not(:disabled) {
    background-color: var(--op-primary-active);
    transform: translateY(0);
}

/* Secondary Button */
.op-btn-secondary {
    background-color: var(--op-secondary);
    color: var(--op-text-inverse);
    box-shadow: 0 1px 3px rgba(var(--op-secondary-rgb), 0.3);
}

.op-btn-secondary:hover:not(:disabled) {
    background-color: var(--op-secondary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--op-secondary-rgb), 0.4);
}

/* Outline Buttons */
.op-btn-outline {
    background-color: transparent;
    border-color: var(--op-border);
    color: var(--op-text-primary);
}

.op-btn-outline:hover:not(:disabled) {
    background-color: var(--op-bg-hover);
    border-color: var(--op-primary);
    color: var(--op-primary);
}

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

.op-btn-outline-primary:hover:not(:disabled) {
    background-color: var(--op-primary);
    color: var(--op-text-inverse);
}

/* Ghost Button */
.op-btn-ghost {
    background-color: transparent;
    color: var(--op-text-secondary);
}

.op-btn-ghost:hover:not(:disabled) {
    background-color: var(--op-bg-hover);
    color: var(--op-text-primary);
}

/* Soft/Light Buttons */
.op-btn-soft-primary {
    background-color: var(--op-primary-light);
    color: var(--op-primary);
}

.op-btn-soft-primary:hover:not(:disabled) {
    background-color: var(--op-primary);
    color: var(--op-text-inverse);
}

.op-btn-soft-success {
    background-color: var(--op-success-light);
    color: var(--op-success);
}

.op-btn-soft-success:hover:not(:disabled) {
    background-color: var(--op-success);
    color: var(--op-text-inverse);
}

.op-btn-soft-warning {
    background-color: var(--op-warning-light);
    color: var(--op-warning);
}

.op-btn-soft-warning:hover:not(:disabled) {
    background-color: var(--op-warning);
    color: var(--op-text-inverse);
}

.op-btn-soft-error {
    background-color: var(--op-error-light);
    color: var(--op-error);
}

.op-btn-soft-error:hover:not(:disabled) {
    background-color: var(--op-error);
    color: var(--op-text-inverse);
}

/* Icon Button */
.op-btn-icon {
    padding: var(--op-space-2);
    border-radius: var(--op-radius-md);
}

.op-btn-icon.op-btn-sm {
    padding: var(--op-space-1);
}

.op-btn-icon.op-btn-lg {
    padding: var(--op-space-3);
}

/* Success, Warning, Error Buttons */
.op-btn-success {
    background-color: var(--op-success);
    color: var(--op-text-inverse);
}

.op-btn-success:hover:not(:disabled) {
    filter: brightness(0.9);
    transform: translateY(-1px);
}

.op-btn-warning {
    background-color: var(--op-warning);
    color: var(--op-text-inverse);
}

.op-btn-warning:hover:not(:disabled) {
    filter: brightness(0.9);
    transform: translateY(-1px);
}

.op-btn-error {
    background-color: var(--op-error);
    color: var(--op-text-inverse);
}

.op-btn-error:hover:not(:disabled) {
    filter: brightness(0.9);
    transform: translateY(-1px);
}

/* ============================================
   Cards
   ============================================ */

.op-card {
    background-color: var(--op-bg-surface);
    border: 1px solid var(--op-border);
    border-radius: var(--op-radius-lg);
    box-shadow: var(--op-shadow-card);
    transition: box-shadow var(--op-transition-base), transform var(--op-transition-base);
}

.op-card:hover {
    box-shadow: var(--op-shadow-card-hover);
}

.op-card-clickable:hover {
    transform: translateY(-2px);
    cursor: pointer;
}

.op-card-header {
    padding: var(--op-space-4) var(--op-space-6);
    border-bottom: 1px solid var(--op-border-light);
}

.op-card-body {
    padding: var(--op-space-6);
}

.op-card-footer {
    padding: var(--op-space-4) var(--op-space-6);
    border-top: 1px solid var(--op-border-light);
    background-color: var(--op-bg-hover);
    border-radius: 0 0 var(--op-radius-lg) var(--op-radius-lg);
}

/* Card Variants */
.op-card-elevated {
    border: none;
    box-shadow: var(--op-shadow-md);
}

.op-card-flat {
    box-shadow: none;
}

/* ============================================
   KPI Cards (Dashboard)
   ============================================ */

.op-kpi-card {
    background-color: var(--op-bg-surface);
    border: 1px solid var(--op-border);
    border-radius: var(--op-radius-lg);
    padding: var(--op-space-6);
    box-shadow: var(--op-shadow-card);
    transition: all var(--op-transition-base);
    position: relative;
    overflow: hidden;
}

.op-kpi-card:hover {
    box-shadow: var(--op-shadow-card-hover);
    transform: translateY(-2px);
}

.op-kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--op-primary);
    border-radius: var(--op-radius-lg) var(--op-radius-lg) 0 0;
}

.op-kpi-card.op-kpi-success::before { background: var(--op-success); }
.op-kpi-card.op-kpi-warning::before { background: var(--op-warning); }
.op-kpi-card.op-kpi-error::before { background: var(--op-error); }
.op-kpi-card.op-kpi-info::before { background: var(--op-info); }
.op-kpi-card.op-kpi-secondary::before { background: var(--op-secondary); }

.op-kpi-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--op-space-4);
}

.op-kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--op-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--op-primary-light);
    color: var(--op-primary);
}

.op-kpi-icon.op-kpi-success { background-color: var(--op-success-light); color: var(--op-success); }
.op-kpi-icon.op-kpi-warning { background-color: var(--op-warning-light); color: var(--op-warning); }
.op-kpi-icon.op-kpi-error { background-color: var(--op-error-light); color: var(--op-error); }
.op-kpi-icon.op-kpi-info { background-color: var(--op-info-light); color: var(--op-info); }

.op-kpi-icon svg {
    width: 24px;
    height: 24px;
}

.op-kpi-value {
    font-size: var(--op-text-3xl);
    font-weight: var(--op-font-bold);
    color: var(--op-text-primary);
    line-height: 1.2;
    margin-bottom: var(--op-space-1);
}

.op-kpi-label {
    font-size: var(--op-text-sm);
    color: var(--op-text-secondary);
    margin-bottom: var(--op-space-3);
}

.op-kpi-trend {
    display: inline-flex;
    align-items: center;
    gap: var(--op-space-1);
    font-size: var(--op-text-sm);
    font-weight: var(--op-font-medium);
    padding: var(--op-space-1) var(--op-space-2);
    border-radius: var(--op-radius-full);
}

.op-kpi-trend-up {
    background-color: var(--op-success-light);
    color: var(--op-success);
}

.op-kpi-trend-down {
    background-color: var(--op-error-light);
    color: var(--op-error);
}

.op-kpi-trend-neutral {
    background-color: var(--op-bg-hover);
    color: var(--op-text-secondary);
}

/* ============================================
   Form Elements
   ============================================ */

.op-input {
    width: 100%;
    padding: var(--op-space-2) var(--op-space-3);
    font-family: var(--op-font-family);
    font-size: var(--op-text-sm);
    line-height: 1.5;
    color: var(--op-text-primary);
    background-color: var(--op-bg-surface);
    border: 1px solid var(--op-border);
    border-radius: var(--op-radius-md);
    transition: all var(--op-transition-fast);
}

.op-input::placeholder {
    color: var(--op-text-tertiary);
}

.op-input:hover {
    border-color: var(--op-text-tertiary);
}

.op-input:focus {
    outline: none;
    border-color: var(--op-primary);
    box-shadow: 0 0 0 3px rgba(var(--op-primary-rgb), 0.15);
}

.op-input:disabled {
    background-color: var(--op-bg-hover);
    cursor: not-allowed;
    opacity: 0.7;
}

.op-input-error {
    border-color: var(--op-error);
}

.op-input-error:focus {
    box-shadow: 0 0 0 3px rgba(var(--op-error-rgb), 0.15);
}

/* Input with Icon */
.op-input-group {
    position: relative;
}

.op-input-icon {
    position: absolute;
    left: var(--op-space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--op-text-tertiary);
    pointer-events: none;
}

.op-input-group .op-input {
    padding-left: var(--op-space-10);
}

/* Labels */
.op-label {
    display: block;
    font-size: var(--op-text-sm);
    font-weight: var(--op-font-medium);
    color: var(--op-text-primary);
    margin-bottom: var(--op-space-2);
}

.op-label-required::after {
    content: ' *';
    color: var(--op-error);
}

/* Helper Text */
.op-helper-text {
    font-size: var(--op-text-xs);
    color: var(--op-text-tertiary);
    margin-top: var(--op-space-1);
}

.op-helper-text-error {
    color: var(--op-error);
}

/* ============================================
   Badges
   ============================================ */

.op-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--op-space-1) var(--op-space-2);
    font-size: var(--op-text-xs);
    font-weight: var(--op-font-medium);
    border-radius: var(--op-radius-full);
    white-space: nowrap;
}

.op-badge-primary {
    background-color: var(--op-primary-light);
    color: var(--op-primary);
}

.op-badge-secondary {
    background-color: var(--op-secondary-light);
    color: var(--op-secondary);
}

.op-badge-success {
    background-color: var(--op-success-light);
    color: var(--op-success);
}

.op-badge-warning {
    background-color: var(--op-warning-light);
    color: var(--op-warning);
}

.op-badge-error {
    background-color: var(--op-error-light);
    color: var(--op-error);
}

.op-badge-info {
    background-color: var(--op-info-light);
    color: var(--op-info);
}

.op-badge-neutral {
    background-color: var(--op-bg-hover);
    color: var(--op-text-secondary);
}

/* Solid Badges */
.op-badge-solid-primary {
    background-color: var(--op-primary);
    color: var(--op-text-inverse);
}

.op-badge-solid-success {
    background-color: var(--op-success);
    color: var(--op-text-inverse);
}

.op-badge-solid-warning {
    background-color: var(--op-warning);
    color: var(--op-text-inverse);
}

.op-badge-solid-error {
    background-color: var(--op-error);
    color: var(--op-text-inverse);
}

/* ============================================
   Avatar
   ============================================ */

.op-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--op-radius-full);
    background-color: var(--op-primary);
    color: var(--op-text-inverse);
    font-weight: var(--op-font-semibold);
    overflow: hidden;
    flex-shrink: 0;
}

.op-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.op-avatar-xs { width: 24px; height: 24px; font-size: var(--op-text-xs); }
.op-avatar-sm { width: 32px; height: 32px; font-size: var(--op-text-sm); }
.op-avatar-md { width: 40px; height: 40px; font-size: var(--op-text-base); }
.op-avatar-lg { width: 48px; height: 48px; font-size: var(--op-text-lg); }
.op-avatar-xl { width: 64px; height: 64px; font-size: var(--op-text-xl); }
.op-avatar-2xl { width: 80px; height: 80px; font-size: var(--op-text-2xl); }

/* Avatar Group */
.op-avatar-group {
    display: flex;
}

.op-avatar-group .op-avatar {
    border: 2px solid var(--op-bg-surface);
    margin-left: -8px;
}

.op-avatar-group .op-avatar:first-child {
    margin-left: 0;
}

/* ============================================
   Tables
   ============================================ */

.op-table-wrapper {
    overflow-x: auto;
    background-color: var(--op-bg-surface);
    border-radius: var(--op-radius-lg);
    border: 1px solid var(--op-border);
}

.op-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--op-text-sm);
}

.op-table th,
.op-table td {
    padding: var(--op-space-3) var(--op-space-4);
    text-align: left;
    border-bottom: 1px solid var(--op-border-light);
}

.op-table th {
    font-weight: var(--op-font-semibold);
    color: var(--op-text-primary);
    background-color: var(--op-bg-hover);
    white-space: nowrap;
}

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

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

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

/* Striped Table */
.op-table-striped tbody tr:nth-child(even) {
    background-color: var(--op-bg-hover);
}

/* ============================================
   Progress
   ============================================ */

.op-progress {
    width: 100%;
    height: 8px;
    background-color: var(--op-bg-hover);
    border-radius: var(--op-radius-full);
    overflow: hidden;
}

.op-progress-bar {
    height: 100%;
    background-color: var(--op-primary);
    border-radius: var(--op-radius-full);
    transition: width var(--op-transition-slow);
}

.op-progress-bar-success { background-color: var(--op-success); }
.op-progress-bar-warning { background-color: var(--op-warning); }
.op-progress-bar-error { background-color: var(--op-error); }

/* ============================================
   Alerts
   ============================================ */

.op-alert {
    padding: var(--op-space-4);
    border-radius: var(--op-radius-md);
    display: flex;
    align-items: flex-start;
    gap: var(--op-space-3);
}

.op-alert-icon {
    flex-shrink: 0;
}

.op-alert-content {
    flex: 1;
}

.op-alert-title {
    font-weight: var(--op-font-semibold);
    margin-bottom: var(--op-space-1);
}

.op-alert-info {
    background-color: var(--op-info-light);
    color: var(--op-info);
    border: 1px solid rgba(var(--op-info-rgb), 0.3);
}

.op-alert-success {
    background-color: var(--op-success-light);
    color: var(--op-success);
    border: 1px solid rgba(var(--op-success-rgb), 0.3);
}

.op-alert-warning {
    background-color: var(--op-warning-light);
    color: var(--op-warning);
    border: 1px solid rgba(var(--op-warning-rgb), 0.3);
}

.op-alert-error {
    background-color: var(--op-error-light);
    color: var(--op-error);
    border: 1px solid rgba(var(--op-error-rgb), 0.3);
}

/* ============================================
   Divider
   ============================================ */

.op-divider {
    height: 1px;
    background-color: var(--op-border);
    border: none;
    margin: var(--op-space-4) 0;
}

.op-divider-vertical {
    width: 1px;
    height: auto;
    align-self: stretch;
    margin: 0 var(--op-space-4);
}

/* ============================================
   Skeleton Loading
   ============================================ */

.op-skeleton {
    background: linear-gradient(90deg, var(--op-bg-hover) 25%, var(--op-bg-surface) 50%, var(--op-bg-hover) 75%);
    background-size: 200% 100%;
    animation: op-skeleton-loading 1.5s infinite;
    border-radius: var(--op-radius-md);
}

@keyframes op-skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.op-skeleton-text {
    height: 1em;
    margin-bottom: var(--op-space-2);
}

.op-skeleton-text:last-child {
    width: 60%;
}

.op-skeleton-circle {
    border-radius: var(--op-radius-full);
}

/* ============================================
   Tooltips
   ============================================ */

.op-tooltip {
    position: relative;
}

.op-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: var(--op-space-2) var(--op-space-3);
    background-color: var(--op-text-primary);
    color: var(--op-text-inverse);
    font-size: var(--op-text-xs);
    font-weight: var(--op-font-medium);
    border-radius: var(--op-radius-md);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--op-transition-fast);
    z-index: var(--op-z-tooltip);
}

.op-tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

/* ============================================
   Utility Classes
   ============================================ */

/* Display */
.op-flex { display: flex; }
.op-inline-flex { display: inline-flex; }
.op-grid { display: grid; }
.op-hidden { display: none; }

/* Flex */
.op-flex-row { flex-direction: row; }
.op-flex-col { flex-direction: column; }
.op-items-start { align-items: flex-start; }
.op-items-center { align-items: center; }
.op-items-end { align-items: flex-end; }
.op-justify-start { justify-content: flex-start; }
.op-justify-center { justify-content: center; }
.op-justify-end { justify-content: flex-end; }
.op-justify-between { justify-content: space-between; }
.op-flex-wrap { flex-wrap: wrap; }
.op-flex-1 { flex: 1; }
.op-flex-shrink-0 { flex-shrink: 0; }

/* Gap */
.op-gap-1 { gap: var(--op-space-1); }
.op-gap-2 { gap: var(--op-space-2); }
.op-gap-3 { gap: var(--op-space-3); }
.op-gap-4 { gap: var(--op-space-4); }
.op-gap-6 { gap: var(--op-space-6); }
.op-gap-8 { gap: var(--op-space-8); }

/* Padding */
.op-p-0 { padding: 0; }
.op-p-2 { padding: var(--op-space-2); }
.op-p-3 { padding: var(--op-space-3); }
.op-p-4 { padding: var(--op-space-4); }
.op-p-6 { padding: var(--op-space-6); }
.op-p-8 { padding: var(--op-space-8); }
.op-px-4 { padding-left: var(--op-space-4); padding-right: var(--op-space-4); }
.op-py-4 { padding-top: var(--op-space-4); padding-bottom: var(--op-space-4); }

/* Margin */
.op-m-0 { margin: 0; }
.op-m-2 { margin: var(--op-space-2); }
.op-m-4 { margin: var(--op-space-4); }
.op-mb-2 { margin-bottom: var(--op-space-2); }
.op-mb-4 { margin-bottom: var(--op-space-4); }
.op-mb-6 { margin-bottom: var(--op-space-6); }
.op-mt-4 { margin-top: var(--op-space-4); }
.op-mt-6 { margin-top: var(--op-space-6); }

/* Width */
.op-w-full { width: 100%; }
.op-w-auto { width: auto; }
.op-max-w-full { max-width: 100%; }

/* Text */
.op-text-center { text-align: center; }
.op-text-left { text-align: left; }
.op-text-right { text-align: right; }
.op-text-primary { color: var(--op-text-primary); }
.op-text-secondary { color: var(--op-text-secondary); }
.op-text-tertiary { color: var(--op-text-tertiary); }
.op-text-success { color: var(--op-success); }
.op-text-error { color: var(--op-error); }
.op-text-warning { color: var(--op-warning); }

/* Font */
.op-font-medium { font-weight: var(--op-font-medium); }
.op-font-semibold { font-weight: var(--op-font-semibold); }
.op-font-bold { font-weight: var(--op-font-bold); }

/* Border */
.op-border { border: 1px solid var(--op-border); }
.op-border-t { border-top: 1px solid var(--op-border); }
.op-border-b { border-bottom: 1px solid var(--op-border); }
.op-rounded { border-radius: var(--op-radius-md); }
.op-rounded-lg { border-radius: var(--op-radius-lg); }
.op-rounded-full { border-radius: var(--op-radius-full); }

/* Shadow */
.op-shadow { box-shadow: var(--op-shadow-sm); }
.op-shadow-md { box-shadow: var(--op-shadow-md); }
.op-shadow-lg { box-shadow: var(--op-shadow-lg); }

/* Cursor */
.op-cursor-pointer { cursor: pointer; }
.op-cursor-not-allowed { cursor: not-allowed; }

/* Transition */
.op-transition { transition: all var(--op-transition-base); }

/* Overflow */
.op-overflow-hidden { overflow: hidden; }
.op-overflow-auto { overflow: auto; }

/* Position */
.op-relative { position: relative; }
.op-absolute { position: absolute; }
.op-fixed { position: fixed; }
.op-sticky { position: sticky; }

/* ============================================
   Responsive Grid
   ============================================ */

.op-grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.op-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.op-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.op-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.op-grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
.op-grid-cols-12 { grid-template-columns: repeat(12, 1fr); }

@media (min-width: 640px) {
    .sm\:op-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
    .sm\:op-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 768px) {
    .md\:op-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
    .md\:op-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
    .md\:op-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1024px) {
    .lg\:op-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
    .lg\:op-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
    .lg\:op-grid-cols-5 { grid-template-columns: repeat(5, 1fr); }
    .lg\:op-grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
}

@media (min-width: 1280px) {
    .xl\:op-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
    .xl\:op-grid-cols-5 { grid-template-columns: repeat(5, 1fr); }
    .xl\:op-grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
}

/* ============================================
   Animations
   ============================================ */

@keyframes op-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes op-slide-up {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes op-slide-down {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes op-scale-in {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

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

.op-animate-fade-in { animation: op-fade-in var(--op-transition-base) ease-out; }
.op-animate-slide-up { animation: op-slide-up var(--op-transition-smooth); }
.op-animate-slide-down { animation: op-slide-down var(--op-transition-smooth); }
.op-animate-scale-in { animation: op-scale-in var(--op-transition-smooth); }
.op-animate-spin { animation: op-spin 1s linear infinite; }

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--op-bg-hover);
    border-radius: var(--op-radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--op-text-tertiary);
    border-radius: var(--op-radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--op-text-secondary);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--op-text-tertiary) var(--op-bg-hover);
}

/* ============================================
   Selection
   ============================================ */

::selection {
    background-color: rgba(var(--op-primary-rgb), 0.3);
    color: var(--op-text-primary);
}

/* ============================================
   Focus Visible
   ============================================ */

:focus-visible {
    outline: 2px solid var(--op-primary);
    outline-offset: 2px;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .op-no-print { display: none !important; }
    
    body {
        background: white;
        color: black;
    }
    
    .op-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}