/* ============================================================
   main.css — Reset, design tokens, base typography, layout
   ============================================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    line-height: 1.6;
    min-height: 100vh;
}

img, video {
    max-width: 100%;
    display: block;
}

ul, ol {
    list-style: none;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ---- Design Tokens ---- */
:root {
    /* Colors */
    --color-primary: #5B9BD5;
    --color-primary-dark: #4A7FB0;
    --color-primary-light: #EBF4FB;
    --color-secondary: #F8B739;
    --color-secondary-dark: #D9981A;
    --color-accent: #E67E50;
    --color-accent-dark: #C45E30;
    --color-success: #6FCF97;
    --color-success-bg: #ECFDF5;
    --color-error: #EB5757;
    --color-error-bg: #FEF2F2;

    --color-text-primary: #2C3E50;
    --color-text-secondary: #6B7280;
    --color-text-muted: #9CA3AF;
    --color-background: #FFFFFF;
    --color-background-alt: #F9FAFB;
    --color-background-dark: #2C3E50;
    --color-border: #E5E7EB;
    --color-border-focus: #5B9BD5;

    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Open Sans', 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;
    --font-size-5xl:  3rem;

    /* Spacing */
    --spacing-xs:  0.25rem;
    --spacing-sm:  0.5rem;
    --spacing-md:  1rem;
    --spacing-lg:  1.5rem;
    --spacing-xl:  2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: var(--spacing-md);

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius:    8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    --border-radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Z-index scale */
    --z-dropdown: 100;
    --z-sticky:   200;
    --z-overlay:  300;
    --z-modal:    400;
    --z-toast:    500;
}

/* ---- Accessibility: Skip link ---- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    border-radius: var(--border-radius);
    z-index: var(--z-toast);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
}

/* ---- Layout ---- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.section {
    padding-block: var(--spacing-3xl);
}

.section-alt {
    background-color: var(--color-background-alt);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-inline: auto;
}

/* ---- Grid utilities ---- */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 { font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl)); }
h2 { font-size: clamp(var(--font-size-2xl), 3.5vw, var(--font-size-4xl)); }
h3 { font-size: clamp(var(--font-size-xl), 2.5vw, var(--font-size-3xl)); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
}

p:last-child {
    margin-bottom: 0;
}

.text-sm    { font-size: var(--font-size-sm); }
.text-lg    { font-size: var(--font-size-lg); }
.text-muted { color: var(--color-text-secondary); }
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.font-bold  { font-weight: 700; }
.font-semibold { font-weight: 600; }

/* ---- Links ---- */
a:not([class]) {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

a:not([class]):hover {
    color: var(--color-primary-dark);
}

/* ---- Divider ---- */
.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin-block: var(--spacing-xl);
}

/* ---- Visually hidden (accessibility) ---- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ---- Focus styles ---- */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--border-radius-sm);
}

/* ---- Page hero (shared across inner pages) ---- */
.page-hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    padding-block: var(--spacing-3xl);
    text-align: center;
}

.page-hero h1 {
    color: #fff;
    margin-bottom: var(--spacing-sm);
}

.page-hero p {
    color: rgba(255, 255, 255, 0.85);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin-inline: auto;
    margin-bottom: 0;
}

/* ---- Site Header ---- */
.site-header {
    position: sticky;
    top: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.logo img {
    height: 40px;
    width: auto;
}

/* ---- Navigation ---- */
.main-nav .nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    gap: 5px;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background-color: var(--color-background-alt);
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after  { top:  7px; }

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- Site Footer ---- */
.site-footer {
    background-color: var(--color-background-dark);
    color: rgba(255, 255, 255, 0.8);
    padding-top: var(--spacing-3xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    color: #fff;
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-section p,
.footer-section a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-section a:hover {
    color: #fff;
}

.footer-section ul li + li {
    margin-top: var(--spacing-xs);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-block: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================================
   Modernization — typography, scroll animations, eyebrow,
   glassmorphism, SVG icon wrappers, floating enroll button
   ============================================================ */

/* Tighter heading letter-spacing */
h1, h2 { letter-spacing: -0.025em; }
h3      { letter-spacing: -0.01em; }

/* Eyebrow pill label */
.eyebrow {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0.3rem 0.9rem;
    border-radius: 9999px;
    margin-bottom: 0.875rem;
}

/* Scroll-triggered fade-up animation */
.fade-up {
    opacity: 0;
    transform: translateY(28px);
    transition:
        opacity   0.65s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up.delay-1 { transition-delay:  80ms; }
.fade-up.delay-2 { transition-delay: 160ms; }
.fade-up.delay-3 { transition-delay: 240ms; }
.fade-up.delay-4 { transition-delay: 320ms; }

@media (prefers-reduced-motion: reduce) {
    .fade-up {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* SVG icons inside card-icon and diff-icon wrappers */
.card-icon svg,
.diff-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
    flex-shrink: 0;
}

/* Floating enroll button (shown on mobile via responsive.css) */
.floating-enroll {
    display: none;
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: var(--z-sticky);
    background: var(--color-primary);
    color: #fff;
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 700;
    padding: 0.875rem 1.5rem;
    border-radius: 9999px;
    text-decoration: none;
    box-shadow: 0 4px 24px rgba(91, 155, 213, 0.45);
    opacity: 0;
    transform: translateY(16px) scale(0.95);
    pointer-events: none;
    transition:
        opacity           0.3s ease,
        transform         0.3s ease,
        background-color  0.15s ease,
        box-shadow        0.15s ease;
}

.floating-enroll.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.floating-enroll:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 8px 32px rgba(91, 155, 213, 0.55);
    color: #fff;
}