/* ========================================
   GLOBAL STYLES - iNurseApp v2.0
   ✅ Performance: will-change, contain
   ✅ Acessibilidade: focus-visible
   ✅ Dark mode ready
   ======================================== */

:root {
    /* Colors */
    --primary: #0066CC;
    --primary-dark: #003D7A;
    --primary-light: #3399FF;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    
    /* Neutrals */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition: all 0.2s ease;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1F2937;
        --gray-50: #111827;
        --gray-900: #F9FAFB;
    }
}

/* ========================================
   RESET & BASE
   ======================================== */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: 0.5em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); }
h3 { font-size: clamp(1.5rem, 3vw, 1.875rem); }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: 1rem;
}

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

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

/* ✅ Acessibilidade: Focus visible */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* ========================================
   LAYOUT
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

.container-sm {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    /* ✅ Performance */
    will-change: transform;
    backface-visibility: hidden;
}

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

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

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

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
}

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

.btn-danger:hover:not(:disabled) {
    background: #DC2626;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ========================================
   FORMS
   ======================================== */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--gray-700);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--white);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

.form-error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-help {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Invalid state */
.form-input:invalid:not(:placeholder-shown),
.form-textarea:invalid:not(:placeholder-shown) {
    border-color: var(--danger);
}

/* Valid state */
.form-input:valid:not(:placeholder-shown),
.form-textarea:valid:not(:placeholder-shown) {
    border-color: var(--success);
}

/* ========================================
   CARDS
   ======================================== */

.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    transition: var(--transition);
    /* ✅ Performance */
    contain: layout style paint;
}

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

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.card-body {
    margin-bottom: var(--spacing-md);
}

.card-footer {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

/* ========================================
   BADGES
   ======================================== */

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--gray-100);
    color: var(--gray-700);
}

.badge-primary {
    background: #DBEAFE;
    color: var(--primary-dark);
}

.badge-success {
    background: #D1FAE5;
    color: #065F46;
}

.badge-danger {
    background: #FEE2E2;
    color: #991B1B;
}

.badge-warning {
    background: #FEF3C7;
    color: #92400E;
}

/* ========================================
   ALERTS
   ======================================== */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
    border-color: #10B981;
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
    border-color: #EF4444;
}

.alert-warning {
    background: #FEF3C7;
    color: #92400E;
    border-color: #F59E0B;
}

.alert-info {
    background: #DBEAFE;
    color: #1E40AF;
    border-color: #3B82F6;
}

/* ========================================
   UTILITIES
   ======================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--gray-500); }

.bg-primary { background-color: var(--primary); }
.bg-gray { background-color: var(--gray-50); }
.bg-white { background-color: var(--white); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }

/* ========================================
   LOADING SPINNER
   ======================================== */

.spinner {
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

/* ========================================
   SKELETON LOADING
   ======================================== */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--gray-200) 0%,
        var(--gray-100) 50%,
        var(--gray-200) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

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

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-title {
    height: 2rem;
    width: 60%;
    margin-bottom: 1rem;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        color: #000;
        background: #fff;
    }
    
    a {
        text-decoration: underline;
    }
}

/* ========================================
   PREFERS REDUCED MOTION
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}