/* ============================================
   PaisPro - Global Design System
   Professional Business Management System
   ============================================ */

/* ============================================
   CSS VARIABLES - Design Tokens
   ============================================ */
:root {
    /* Primary Brand Colors */
    --accent-primary: #3b82f6;
    --accent-primary-hover: #2563eb;
    --accent-primary-dark: #1e40af;
    --accent-primary-light: #60a5fa;

    /* Semantic Colors */
    --success: #10b981;
    --success-hover: #059669;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --info: #0ea5e9;
    --info-hover: #0284c7;

    /* Neutral Colors - Light Mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    --gradient-secondary: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing - 8px Grid System */
    --spacing-1: 0.5rem;   /* 8px */
    --spacing-2: 1rem;     /* 16px */
    --spacing-3: 1.5rem;   /* 24px */
    --spacing-4: 2rem;     /* 32px */
    --spacing-5: 2.5rem;   /* 40px */
    --spacing-6: 3rem;     /* 48px */
    --spacing-8: 4rem;     /* 64px */
    --spacing-10: 5rem;    /* 80px */

    /* Border Radius */
    --radius-sm: 0.25rem;  /* 4px */
    --radius: 0.5rem;      /* 8px */
    --radius-md: 0.75rem;  /* 12px */
    --radius-lg: 1rem;     /* 16px */
    --radius-xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;

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

    /* Z-index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

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

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin-bottom: var(--spacing-2);
    color: var(--text-secondary);
}

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

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

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-1);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
}

/* Outline Button */
.btn-outline {
    background-color: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--accent-primary);
    color: white;
}

/* Success Button */
.btn-success {
    background-color: var(--success);
    color: white;
}

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

/* Danger Button */
.btn-danger {
    background-color: var(--danger);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-3);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-1);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    font-family: var(--font-family-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

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

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

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

/* Form Validation States */
.form-input.is-invalid,
.form-select.is-invalid,
.form-textarea.is-invalid {
    border-color: var(--danger);
}

.form-input.is-valid,
.form-select.is-valid,
.form-textarea.is-valid {
    border-color: var(--success);
}

.form-error {
    display: block;
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--danger);
}

.form-help {
    display: block;
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-4);
    transition: all var(--transition-base);
}

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

.card-header {
    margin-bottom: var(--spacing-3);
    padding-bottom: var(--spacing-3);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: 0;
}

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

.card-footer {
    margin-top: var(--spacing-3);
    padding-top: var(--spacing-3);
    border-top: 1px solid var(--border-color);
}

/* ============================================
   ALERTS
   ============================================ */
.alert {
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-3);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-info {
    background-color: rgba(14, 165, 233, 0.1);
    color: var(--info);
    border: 1px solid rgba(14, 165, 233, 0.3);
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    line-height: 1;
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.badge-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

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

.badge-info {
    background-color: rgba(14, 165, 233, 0.1);
    color: var(--info);
}

.badge-primary {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
}

/* ============================================
   MODALS
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
}

.modal-content {
    position: relative;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    z-index: var(--z-modal);
    padding: var(--spacing-4);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-3);
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

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

/* ============================================
   TABLES
   ============================================ */
.table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-primary);
}

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

.table th {
    padding: var(--spacing-2) var(--spacing-3);
    text-align: right;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.table td {
    padding: var(--spacing-2) var(--spacing-3);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

/* ============================================
   LOADING STATES
   ============================================ */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Spacing Utilities */
.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }

.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }

.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }

/* Text Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

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

.font-bold { font-weight: var(--font-weight-bold); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-medium { font-weight: var(--font-weight-medium); }

/* Display Utilities */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }

/* Flex Utilities */
.flex-column { flex-direction: column; }
.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }

    /* Prevent iOS auto-zoom on input focus (requires font-size >= 16px) */
    input,
    textarea,
    select,
    input[type="text"],
    input[type="number"],
    input[type="email"],
    input[type="password"],
    input[type="tel"],
    input[type="url"],
    input[type="search"],
    input[type="date"] {
        font-size: 16px !important;
    }

    .btn {
        padding: 0.625rem 1.25rem;
    }

    .card {
        padding: var(--spacing-3);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-4: 1.5rem;
        --spacing-5: 2rem;
        --spacing-6: 2.5rem;
    }
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    pointer-events: none;
}

.toast {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    min-width: 300px;
    max-width: 500px;
    animation: toastIn 0.3s ease forwards;
    pointer-events: auto;
}

.toast.toast-out {
    animation: toastOut 0.3s ease forwards;
}

.toast-success { border-right: 4px solid #10b981; }
.toast-error { border-right: 4px solid #ef4444; }
.toast-warning { border-right: 4px solid #f59e0b; }
.toast-info { border-right: 4px solid #3b82f6; }

.toast-icon { font-size: 1.2rem; flex-shrink: 0; }
.toast-success .toast-icon { color: #10b981; }
.toast-error .toast-icon { color: #ef4444; }
.toast-warning .toast-icon { color: #f59e0b; }
.toast-info .toast-icon { color: #3b82f6; }

.toast-message {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.4;
    white-space: pre-line;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    margin-right: -0.5rem;
    font-size: 0.85rem;
    transition: color 0.15s;
}

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

@keyframes toastIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-20px); }
}

/* ============================================
   GLOBAL FOOTER
   ============================================ */
.app-footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    margin-top: auto;
}

.app-footer .footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.app-footer .footer-brand {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-weight: 500;
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.45;
}

.app-footer .footer-brand .logo-icon-sm {
    width: 18px;
    height: 18px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.5rem;
}

.app-footer .footer-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.app-footer .footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8125rem;
    transition: color 0.15s;
}

.app-footer .footer-links a:hover {
    color: var(--accent-primary);
}

.app-footer .footer-copy {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.app-footer .footer-status {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.app-footer .footer-status .status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #10b981;
}

@media (max-width: 768px) {
    .app-footer .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}