/* Premium Hospital Management System CSS */

:root {
    /* Color Palette */
    --primary-color: #0f766e; /* Vibrant Teal */
    --primary-hover: #115e59;
    --secondary-color: #1e293b; /* Deep Slate */
    --accent-color: #0ea5e9; /* Sky Blue */
    --accent-hover: #0284c7;
    
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    
    --text-main: #334155;
    --text-muted: #64748b;
    
    /* Borders & Shadows */
    --border-color: #e2e8f0;
    --border-radius-sm: 0.5rem;
    --border-radius-md: 1rem;
    --border-radius-lg: 1.5rem;
    
    --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);
}

/* Base Reset & Typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Dynamic Gradient Background (Splash) */
.bg-gradient-animated {
    background: linear-gradient(-45deg, #0f766e, #0ea5e9, #3b82f6, #0d9488);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    min-height: 100vh;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Layout Utilities */
.full-screen-center {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

/* Glassmorphism Panel */
.glass-panel {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
}

/* Micro-Animations */
.animate-fade-in {
    animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.9rem;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--secondary-color);
    background-color: #f8fafc;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all 0.25s ease;
}

.form-control:focus {
    background-color: #fff;
    border-color: var(--accent-color);
    outline: 0;
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.15);
}

/* Premium Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    padding: 0.75rem 1.75rem;
    font-size: 1rem;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    box-shadow: 0 4px 6px -1px rgba(15, 118, 110, 0.2), 0 2px 4px -1px rgba(15, 118, 110, 0.1);
}

.btn-primary:hover {
    color: #fff;
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(15, 118, 110, 0.3), 0 4px 6px -2px rgba(15, 118, 110, 0.15);
}

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
}