/* ================================================
   Newborn Sepsis Society - Base Styles & Variables
   ================================================ */

:root {
    /* Primary palette - Medical blue tones */
    --navy: #1B2A4A;
    --navy-light: #243556;
    --blue-primary: #2563EB;
    --blue-hover: #1D4ED8;
    --blue-light: #DBEAFE;
    --blue-pale: #EFF6FF;

    /* Accent - Warm teal (care / life) */
    --teal: #0D9488;
    --teal-light: #CCFBF1;

    /* Accent - Coral/rose (newborn warmth) */
    --coral: #E8837C;
    --coral-light: #FEE2E2;

    /* 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;

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;

    /* Spacing */
    --section-padding: 6rem 0;
    --container-max: 1200px;
    --container-padding: 0 1.5rem;

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

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition: 0.2s ease;
}

/* ================================================
   Reset & Base
   ================================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-700);
    background-color: var(--white);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--navy);
    line-height: 1.3;
    font-weight: 600;
}

h1 { font-size: 3.25rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

/* ================================================
   Layout
   ================================================ */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: var(--section-padding);
}

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

/* ================================================
   Buttons
   ================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    gap: 0.5rem;
    line-height: 1.4;
}

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

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

.btn-secondary {
    background-color: var(--white);
    color: var(--blue-primary);
    border-color: var(--gray-200);
}

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

.btn-outline-light {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-light:hover {
    background: var(--white);
    color: var(--navy);
    border-color: var(--white);
}

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

.btn-white:hover {
    background: var(--gray-100);
    border-color: var(--gray-100);
    color: var(--navy);
}

.btn-outline-white {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.7);
    color: var(--white);
}

.btn-large {
    padding: 1rem 2.25rem;
    font-size: 1.0625rem;
}

/* ================================================
   Section Headers
   ================================================ */

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 3.5rem;
}

.section-header h2 {
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--gray-500);
    font-size: 1.125rem;
    margin-bottom: 0;
}

.section-label {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--blue-primary);
    margin-bottom: 0.75rem;
}

.section-label-light {
    color: rgba(255, 255, 255, 0.7);
}

.section-cta {
    text-align: center;
    margin-top: 2.5rem;
}

/* ================================================
   Responsive
   ================================================ */

@media (max-width: 1024px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.875rem; }
    .section { padding: 4rem 0; }
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.625rem; }
    h3 { font-size: 1.25rem; }
    .section { padding: 3rem 0; }
    .section-header { margin-bottom: 2.5rem; }
    .btn-large { padding: 0.875rem 1.75rem; font-size: 1rem; }
}