/**
 * HIMS - Main Stylesheet
 * Hospital Information Management System
 * Version: 1.0.0
 */

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

/* =============================================
   ROOT VARIABLES
   ============================================= */
:root {
    /* Colors */
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #7c8ff5;
    --secondary: #764ba2;
    --secondary-dark: #6a3f94;
    --success: #2ecc71;
    --success-dark: #27ae60;
    --danger: #e74c3c;
    --danger-dark: #c0392b;
    --warning: #f39c12;
    --warning-dark: #e67e22;
    --info: #3498db;
    --info-dark: #2980b9;
    
    /* Grays */
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Spacing */
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 60px;
    --header-height: 60px;
    --footer-height: 50px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Fonts */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-100);
    min-height: 100vh;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

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

::-webkit-scrollbar-track {
    background: var(--gray-200);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* =============================================
   TYPOGRAPHY
   ============================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-4xl); }
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: 1rem;
}

/* =============================================
   UTILITY CLASSES
   ============================================= */
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-info { color: var(--info); }
.text-muted { color: var(--gray-600); }

.bg-primary { background-color: var(--primary); }
.bg-secondary { background-color: var(--secondary); }
.bg-success { background-color: var(--success); }
.bg-danger { background-color: var(--danger); }
.bg-warning { background-color: var(--warning); }
.bg-info { background-color: var(--info); }
.bg-light { background-color: var(--gray-100); }
.bg-dark { background-color: var(--gray-800); }

/* Flexbox Utilities */
.d-flex { display: flex; }
.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }
.align-center { align-items: center; }
.align-stretch { align-items: stretch; }
.flex-1 { flex: 1; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }
.gap-5 { gap: 2rem; }

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-uppercase { text-transform: uppercase; }
.text-capitalize { text-transform: capitalize; }
.text-nowrap { white-space: nowrap; }
.text-truncate { 
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Spacing Utilities */
.m-0 { margin: 0; }
.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 1rem; }
.m-4 { margin: 1.5rem; }
.m-5 { margin: 2rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 2rem; }

/* Width & Height */
.w-100 { width: 100%; }
.h-100 { height: 100%; }
.vh-100 { height: 100vh; }

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

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

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    user-select: none;
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    color: #fff;
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-secondary {
    color: #fff;
    background-color: var(--secondary);
    border-color: var(--secondary);
}

.btn-secondary:hover:not(:disabled) {
    color: #fff;
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
}

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

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

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

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

.btn-warning {
    color: #fff;
    background-color: var(--warning);
    border-color: var(--warning);
}

.btn-warning:hover:not(:disabled) {
    color: #fff;
    background-color: var(--warning-dark);
    border-color: var(--warning-dark);
}

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

.btn-info:hover:not(:disabled) {
    color: #fff;
    background-color: var(--info-dark);
    border-color: var(--info-dark);
}

.btn-light {
    color: var(--gray-800);
    background-color: var(--gray-100);
    border-color: var(--gray-300);
}

.btn-light:hover:not(:disabled) {
    background-color: var(--gray-200);
    border-color: var(--gray-400);
}

.btn-dark {
    color: #fff;
    background-color: var(--gray-800);
    border-color: var(--gray-800);
}

.btn-dark:hover:not(:disabled) {
    background-color: var(--gray-900);
    border-color: var(--gray-900);
}

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

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

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* =============================================
   FORMS
   ============================================= */
.form-group {
    margin-bottom: 1rem;
}

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

.form-control {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--gray-800);
    background-color: #fff;
    border: 1px solid var(--gray-400);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control::placeholder {
    color: var(--gray-500);
}

.form-control.is-valid {
    border-color: var(--success);
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.form-control-lg {
    padding: 0.75rem 1rem;
    font-size: var(--font-size-lg);
}

.form-control-sm {
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-sm);
}

/* =============================================
   CARDS
   ============================================= */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    transition: box-shadow var(--transition-normal);
}

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

.card-header {
    padding: 1rem 1.25rem;
    background-color: transparent;
    border-bottom: 1px solid var(--gray-300);
}

.card-header:first-child {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-footer {
    padding: 1rem 1.25rem;
    background-color: transparent;
    border-top: 1px solid var(--gray-300);
}

.card-footer:last-child {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* =============================================
   TABLES
   ============================================= */
.table {
    width: 100%;
    margin-bottom: 1rem;
    background-color: transparent;
}

.table th,
.table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid var(--gray-300);
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid var(--gray-300);
    font-weight: 600;
    color: var(--gray-700);
    background-color: var(--gray-100);
}

.table tbody tr:hover {
    background-color: var(--gray-100);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--gray-100);
}

.table-bordered {
    border: 1px solid var(--gray-300);
}

.table-bordered th,
.table-bordered td {
    border: 1px solid var(--gray-300);
}

.table-hover tbody tr:hover {
    background-color: rgba(102, 126, 234, 0.05);
}

/* =============================================
   ALERTS
   ============================================= */
.alert {
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
}

.alert-primary {
    color: #084298;
    background-color: #cfe2ff;
    border-color: #b6d4fe;
}

.alert-secondary {
    color: #41464b;
    background-color: #e2e3e5;
    border-color: #d3d6d8;
}

.alert-success {
    color: #0f5132;
    background-color: #d1e7dd;
    border-color: #badbcc;
}

.alert-danger {
    color: #842029;
    background-color: #f8d7da;
    border-color: #f5c2c7;
}

.alert-warning {
    color: #664d03;
    background-color: #fff3cd;
    border-color: #ffecb5;
}

.alert-info {
    color: #055160;
    background-color: #cff4fc;
    border-color: #b6effb;
}

/* =============================================
   BADGES
   ============================================= */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-sm);
}

.badge-primary { background-color: var(--primary); color: #fff; }
.badge-secondary { background-color: var(--secondary); color: #fff; }
.badge-success { background-color: var(--success); color: #fff; }
.badge-danger { background-color: var(--danger); color: #fff; }
.badge-warning { background-color: var(--warning); color: #fff; }
.badge-info { background-color: var(--info); color: #fff; }
.badge-light { background-color: var(--gray-200); color: var(--gray-800); }
.badge-dark { background-color: var(--gray-800); color: #fff; }

/* =============================================
   MODALS
   ============================================= */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: 9999;
    overflow: auto;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal.show {
    display: block;
    opacity: 1;
}

.modal-dialog {
    position: relative;
    max-width: 500px;
    margin: 1.75rem auto;
    pointer-events: none;
}

.modal-content {
    position: relative;
    background-color: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    pointer-events: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--gray-300);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-300);
    gap: 0.5rem;
}

/* =============================================
   LOADING SPINNER
   ============================================= */
.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

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

/* =============================================
   RESPONSIVE HELPERS
   ============================================= */
@media (max-width: 768px) {
    .d-sm-none { display: none; }
    .d-sm-block { display: block; }
}

@media (max-width: 576px) {
    .d-xs-none { display: none; }
    .d-xs-block { display: block; }
}