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

:root {
    /* Primary Colors - Professional Healthcare */
    --primary: #1E3A5F;           /* Deep navy - trust/professionalism */
    --primary-light: #2563EB;     /* Bright blue - CTAs */
    --primary-dark: #0F2744;      /* Darker navy */

    /* Secondary Colors */
    --secondary: #0D9488;         /* Teal - accent/success */
    --secondary-light: #14B8A6;   /* Light teal */

    /* Neutral Colors */
    --background: #F8FAFC;        /* Light gray - clean backdrop */
    --surface: #FFFFFF;           /* White - cards/surfaces */
    --text-primary: #1E293B;      /* Dark slate - body text */
    --text-secondary: #64748B;    /* Medium slate - secondary text */
    --text-muted: #94A3B8;        /* Light slate - muted text */
    --border: #E2E8F0;            /* Light border */
    --border-dark: #CBD5E1;       /* Darker border */

    /* Legacy support */
    --blue: #1E3A5F;
    --white: #FFFFFF;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient2: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);
    --gradient3: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
    --gradient4: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 6px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Dark Mode Variables */
body.dark-mode {
    --primary: #93C5FD;
    --primary-light: #60A5FA;
    --primary-dark: #1E3A5F;

    --secondary: #5EEAD4;
    --secondary-light: #2DD4BF;

    --background: #0F172A;
    --surface: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border: #334155;
    --border-dark: #475569;

    --gradient: linear-gradient(135deg, #1E3A5F 0%, #0D9488 100%);
    --gradient2: linear-gradient(135deg, #2563EB 0%, #0D9488 100%);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

/* Light Mode Logo - make white text visible */
body:not(.dark-mode) img[src*="logo.svg"] {
    filter: invert(1) hue-rotate(180deg) brightness(0.6);
}

/* Dark Mode Specific Overrides */
body.dark-mode .navbar-toggler-icon {
    filter: invert(1);
}

body.dark-mode img[src*="logo.svg"] {
    filter: none;  /* Logo is designed for dark backgrounds, no filter needed */
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--background);
    line-height: 1.6;
    -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(--text-primary);
}

/* Utility Classes */
.background-primary {
    background-color: var(--primary);
}

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

.background-light {
    background-color: var(--background);
}

.primary-color {
    color: var(--primary);
}

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

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

/* Button Styles */
.btn-primary-custom {
    background: var(--primary-light);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary-custom:hover {
    background: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary-custom {
    background: var(--surface);
    color: var(--primary);
    border: 1px solid var(--border-dark);
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary-custom:hover {
    background: var(--background);
    border-color: var(--primary);
}

.button-4 {
    background: var(--gradient4);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.2s ease;
}

.button-4:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* Card Styles */
.card-custom {
    background: var(--surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 24px;
    transition: all 0.2s ease;
}

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

/* Navigation */
.nav-li {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 15px;
    letter-spacing: 0;
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-li:hover {
    color: var(--primary-light);
}

/* Link Styles */
a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Form Elements */
input, textarea, select {
    font-family: inherit;
    font-size: 15px;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Responsive Typography */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}