/* 
 * OPD Management Software - Main CSS
 * Mobile-First Responsive Design
 * Clean, Modern & Professional UI
 */

/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
    /* Primary Colors */
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    
    /* Legacy color variable for compatibility */
    --primary-color: #4f46e5;
    
    /* Secondary Colors */
    --secondary: #64748b;
    --secondary-light: #94a3b8;
    --secondary-dark: #475569;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #34d399;
    --success-bg: #ecfdf5;
    --success-color: #10b981;
    
    --warning: #f59e0b;
    --warning-light: #fbbf24;
    --warning-bg: #fffbeb;
    --warning-color: #f59e0b;
    
    --danger: #ef4444;
    --danger-light: #f87171;
    --danger-bg: #fef2f2;
    --danger-color: #ef4444;
    
    --info: #0ea5e9;
    --info-light: #38bdf8;
    --info-bg: #f0f9ff;
    --info-color: #0ea5e9;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --light-color: #f8fafc;
    --dark-color: #334155;
    
    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed: 80px;
    --header-height: 64px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
}

/* ===================================
   Base & Reset Styles
   =================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 0.9375rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--gray-100);
    min-height: 100vh;
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-800);
    margin-top: 0;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

@media (min-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
}

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

/* ===================================
   Card Components
   =================================== */
.card {
    background: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
    transition: box-shadow var(--transition), transform var(--transition);
}

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

.card-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-body {
    padding: 1.25rem;
}

@media (min-width: 768px) {
    .card-body {
        padding: 1.5rem;
    }
}

.card-footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.25rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* Stat Cards */
.stat-card {
    position: relative;
    overflow: hidden;
    border-left: 4px solid;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    opacity: 0.1;
    transform: translate(20px, -20px);
}

.stat-card.primary { border-left-color: var(--primary); }
.stat-card.primary::before { background: var(--primary); }

.stat-card.success { border-left-color: var(--success); }
.stat-card.success::before { background: var(--success); }

.stat-card.info { border-left-color: var(--info); }
.stat-card.info::before { background: var(--info); }

.stat-card.warning { border-left-color: var(--warning); }
.stat-card.warning::before { background: var(--warning); }

.stat-card.danger { border-left-color: var(--danger); }
.stat-card.danger::before { background: var(--danger); }

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-card.primary .stat-icon { background: var(--primary-50); color: var(--primary); }
.stat-card.success .stat-icon { background: var(--success-bg); color: var(--success); }
.stat-card.info .stat-icon { background: var(--info-bg); color: var(--info); }
.stat-card.warning .stat-icon { background: var(--warning-bg); color: var(--warning); }
.stat-card.danger .stat-icon { background: var(--danger-bg); color: var(--danger); }

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-800);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    margin-bottom: 0.25rem;
}

/* ===================================
   Table Styles
   =================================== */
.table-responsive {
    border-radius: var(--radius);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    margin-bottom: 0;
    font-size: 0.875rem;
}

.table th {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-600);
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
    padding: 0.875rem 1rem;
    white-space: nowrap;
}

.table td {
    padding: 0.875rem 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
}

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

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

.table-hover tbody tr:hover {
    background: var(--primary-50);
}

/* Mobile Table Scroll Hint */
@media (max-width: 767.98px) {
    .table-responsive {
        position: relative;
    }
    
    .table-responsive::after {
        content: '';
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        width: 30px;
        background: linear-gradient(to right, transparent, rgba(255,255,255,0.9));
        pointer-events: none;
        opacity: 1;
        transition: opacity var(--transition);
    }
    
    .table-responsive::-webkit-scrollbar {
        height: 4px;
    }
    
    .table-responsive::-webkit-scrollbar-thumb {
        background: var(--gray-300);
        border-radius: var(--radius-full);
    }
    
    .table th, .table td {
        padding: 0.625rem 0.75rem;
        font-size: 0.8125rem;
    }
}

/* ===================================
   Form Styles
   =================================== */
.form-control,
.form-select {
    border-radius: var(--radius);
    border: 1px solid var(--gray-300);
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    transition: all var(--transition);
    background-color: var(--white);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    outline: none;
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.375rem;
}

.form-text {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.input-group-text {
    background: var(--gray-50);
    border-color: var(--gray-300);
    color: var(--gray-500);
}

/* Form Control Sizes */
.form-control-sm,
.form-select-sm {
    padding: 0.375rem 0.625rem;
    font-size: 0.8125rem;
}

.form-control-lg,
.form-select-lg {
    padding: 0.875rem 1rem;
    font-size: 1rem;
}

/* ===================================
   Button Styles
   =================================== */
.btn {
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: 1px solid transparent;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

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

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

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

.btn-success:hover {
    background: #059669;
    border-color: #059669;
    color: var(--white);
}

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

.btn-danger:hover {
    background: #dc2626;
    border-color: #dc2626;
    color: var(--white);
}

.btn-warning {
    background: var(--warning);
    border-color: var(--warning);
    color: var(--gray-800);
}

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

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

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

.btn-outline-secondary {
    color: var(--secondary);
    border-color: var(--gray-300);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-light {
    background: var(--gray-100);
    border-color: var(--gray-200);
    color: var(--gray-700);
}

.btn-light:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

/* Button Sizes */
.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* Icon Button */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius);
}

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

/* ===================================
   Badge Styles
   =================================== */
.badge {
    font-weight: 500;
    font-size: 0.6875rem;
    padding: 0.375em 0.625em;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge.bg-primary { background: var(--primary) !important; }
.badge.bg-success { background: var(--success) !important; }
.badge.bg-warning { background: var(--warning) !important; color: var(--gray-800) !important; }
.badge.bg-danger { background: var(--danger) !important; }
.badge.bg-info { background: var(--info) !important; }
.badge.bg-secondary { background: var(--gray-500) !important; }

/* Soft Badges */
.badge-soft-primary { background: var(--primary-50); color: var(--primary); }
.badge-soft-success { background: var(--success-bg); color: var(--success); }
.badge-soft-warning { background: var(--warning-bg); color: #b45309; }
.badge-soft-danger { background: var(--danger-bg); color: var(--danger); }
.badge-soft-info { background: var(--info-bg); color: #0369a1; }

/* ===================================
   Alert Styles
   =================================== */
.alert {
    border: none;
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    font-size: 0.875rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-success {
    background: var(--success-bg);
    color: #065f46;
}

.alert-warning {
    background: var(--warning-bg);
    color: #92400e;
}

.alert-danger {
    background: var(--danger-bg);
    color: #991b1b;
}

.alert-info {
    background: var(--info-bg);
    color: #0c4a6e;
}

/* ===================================
   Modal Styles
   =================================== */
.modal-content {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--gray-200);
    padding: 1.25rem 1.5rem;
}

.modal-title {
    font-weight: 600;
    font-size: 1.125rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
    gap: 0.5rem;
}

@media (max-width: 575.98px) {
    .modal-dialog {
        margin: 0.5rem;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1rem;
    }
    
    .modal-fullscreen-sm-down {
        width: 100vw;
        max-width: none;
        height: 100%;
        margin: 0;
    }
    
    .modal-fullscreen-sm-down .modal-content {
        height: 100%;
        border: 0;
        border-radius: 0;
    }
}

/* ===================================
   Dropdown Styles
   =================================== */
.dropdown-menu {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    min-width: 200px;
}

.dropdown-item {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    border-radius: var(--radius);
    color: var(--gray-700);
    transition: all var(--transition);
}

.dropdown-item:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.dropdown-item i {
    width: 20px;
    text-align: center;
    margin-right: 0.5rem;
    color: var(--gray-500);
}

.dropdown-divider {
    margin: 0.375rem 0;
    border-color: var(--gray-200);
}

.dropdown-header {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.5rem 0.75rem;
}

/* ===================================
   Pagination Styles
   =================================== */
.pagination {
    gap: 0.25rem;
    flex-wrap: wrap;
}

.page-link {
    border: none;
    border-radius: var(--radius);
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--white);
    transition: all var(--transition);
}

.page-link:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.page-item.active .page-link {
    background: var(--primary);
    color: var(--white);
}

.page-item.disabled .page-link {
    color: var(--gray-400);
    background: var(--gray-50);
}

/* ===================================
   Avatar Styles
   =================================== */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-weight: 600;
    flex-shrink: 0;
}

.avatar-xs { width: 24px; height: 24px; font-size: 0.625rem; }
.avatar-sm { width: 32px; height: 32px; font-size: 0.75rem; }
.avatar-md { width: 40px; height: 40px; font-size: 0.875rem; }
.avatar-lg { width: 48px; height: 48px; font-size: 1rem; }
.avatar-xl { width: 64px; height: 64px; font-size: 1.25rem; }

.avatar-primary { background: var(--primary-100); color: var(--primary); }
.avatar-success { background: var(--success-bg); color: var(--success); }
.avatar-warning { background: var(--warning-bg); color: #b45309; }
.avatar-danger { background: var(--danger-bg); color: var(--danger); }
.avatar-info { background: var(--info-bg); color: #0369a1; }

/* ===================================
   Toast Notification
   =================================== */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.25rem;
    min-width: 280px;
    max-width: 400px;
    animation: slideIn 0.3s ease;
    z-index: 9999;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===================================
   Loading States
   =================================== */
.spinner-border {
    width: 1.25rem;
    height: 1.25rem;
    border-width: 2px;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius);
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* ===================================
   Empty State
   =================================== */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
}

.empty-state-icon {
    font-size: 3rem;
    color: var(--gray-300);
    margin-bottom: 1rem;
}

.empty-state-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.empty-state-text {
    color: var(--gray-500);
    font-size: 0.875rem;
    max-width: 300px;
    margin: 0 auto;
}

/* ===================================
   Utility Classes
   =================================== */
.cursor-pointer { cursor: pointer; }

.text-underline-hover:hover {
    text-decoration: underline;
}

.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.min-vh-100 {
    min-height: 100vh;
}

/* Gap utilities */
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* ===================================
   Custom Scrollbar
   =================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .sidebar,
    .top-header,
    .sidebar-overlay,
    .no-print {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
    
    body {
        background: white;
    }
}

/* ===================================
   Focus & Accessibility
   =================================== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===================================
   Reduced Motion
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Mobile Action Buttons
   =================================== */
@media (max-width: 575.98px) {
    .btn-group-mobile-stack {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-group-mobile-stack .btn {
        width: 100%;
    }
    
    /* Make action buttons smaller on mobile */
    .table .btn-sm {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
}