:root {
    --mcafee-red: #c0171d;
    --grey-bar-bg: #4c4c4c;
    --light-grey-text: #555555; /* Slightly darker grey for better contrast & readability */
    --sign-in-bg: #444;
    --border-color: #e5e5e5;
    --text-main: #222222;
    --call-green: #16a34a;
    --call-green-hover: #15803d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
}

body {
    background-color: #ffffff;
    color: var(--text-main);
    font-size: 16px; /* Increased base font size from default */
    line-height: 1.6;
}

/* Academic Disclaimer Top Bar */
.academic-disclaimer-bar {
    background-color: var(--grey-bar-bg);
    color: #ffffff;
    font-size: 14px; /* Increased from 13px */
    text-align: center;
    padding: 8px 15px;
}

.disclaimer-content strong {
    font-weight: 700;
}

/* Navbar */
.main-header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    padding: 14px 0; /* Slightly increased padding */
}

.header-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-logo-img {
    height: 34px; /* Slightly larger logo icon */
    width: auto;
}

.logo-text {
    font-size: 22px; /* Increased from 19px */
    font-weight: 700;
    color: var(--mcafee-red);
}

.logo-subtext {
    font-weight: 400;
    font-size: 16px; /* Increased from 14px */
    color: var(--light-grey-text);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    font-size: 16px; /* Increased from 14px */
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.nav-links a:not(.sign-in-btn):hover {
    color: var(--mcafee-red);
}

.nav-links span {
    font-size: 13px;
}

.sign-in-btn {
    background-color: var(--sign-in-bg);
    color: #ffffff !important;
    padding: 8px 20px; /* Slightly larger button padding */
    border-radius: 18px;
    font-weight: 600;
    font-size: 15px;
}

/* Main Layout */
.main-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.center-content {
    text-align: center;
    max-width: 800px; /* Expanded slightly for larger typography */
    margin: 0 auto;
}

/* Hero Section */
.hero-section {
    padding: 65px 0 45px;
}

.hero-subheading {
    font-size: 16px; /* Increased from 15px */
    color: var(--mcafee-red);
    font-weight: 700;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

h1 {
    font-size: 38px; /* Increased from 32px for stronger heading hierarchy */
    font-weight: 300;
    color: #111111;
    margin-bottom: 18px;
    line-height: 1.25;
}

.hero-intro-text {
    font-size: 18px; /* Increased from 15px */
    color: var(--light-grey-text);
    line-height: 1.6;
    margin-bottom: 40px;
}

/* Call-to-Action Hero Box */
.primary-call-box {
    background: #fafafa;
    border: 2px solid #e0e0e0;
    border-top: 5px solid var(--mcafee-red);
    border-radius: 10px;
    padding: 35px;
    box-shadow: 0 4px 18px rgba(0,0,0,0.06);
}

.call-box-badge {
    display: inline-block;
    background: #fee2e2;
    color: var(--mcafee-red);
    font-size: 12px; /* Increased from 11px */
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: 14px;
}

.primary-call-box h2 {
    font-size: 26px; /* Increased from 22px */
    font-weight: 600;
    color: #111;
    margin-bottom: 10px;
}

.primary-call-box p {
    font-size: 16px; /* Increased from 14px */
    color: var(--light-grey-text);
    margin-bottom: 24px;
}

.btn-call-large {
    background-color: var(--call-green);
    color: #ffffff;
    text-decoration: none;
    padding: 16px 32px; /* Larger click/tap target */
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: background 0.2s ease;
}

.btn-call-large:hover {
    background-color: var(--call-green-hover);
}

.phone-icon {
    font-size: 24px;
}

.phone-text {
    font-size: 20px; /* Increased from 18px */
}

.call-subtext {
    display: block;
    font-size: 13px; /* Increased from 12px */
    color: #777;
    margin-top: 14px;
}

/* Features Grid */
.features-section {
    padding: 55px 0;
}

.features-section h2 {
    font-size: 26px; /* Increased from 22px */
    color: #111;
    font-weight: 400;
    margin-bottom: 35px;
    text-align: center;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: #ffffff;
    padding: 28px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.card-icon {
    font-size: 28px; /* Increased icon size */
    margin-bottom: 14px;
}

.feature-card h3 {
    font-size: 18px; /* Increased from 16px */
    margin-bottom: 10px;
    color: #111;
}

.feature-card p {
    font-size: 15px; /* Increased from 13px */
    color: var(--light-grey-text);
    line-height: 1.6;
    margin-bottom: 20px;
    flex-grow: 1;
}

.card-link-call {
    color: var(--mcafee-red);
    text-decoration: none;
    font-weight: 700;
    font-size: 15px; /* Increased from 13px */
}

.card-link-call:hover {
    text-decoration: underline;
}

/* Banner Contact Section */
.call-action-section {
    padding: 20px 0 80px;
}

.call-banner {
    background-color: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 35px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 25px;
    flex-wrap: wrap;
}

.banner-tag {
    font-size: 12px;
    font-weight: 700;
    color: #475569;
    letter-spacing: 0.5px;
}

.call-banner h2 {
    font-size: 24px; /* Increased from 20px */
    font-weight: 600;
    margin: 6px 0;
}

.call-banner p {
    font-size: 16px; /* Increased from 14px */
    color: var(--light-grey-text);
}

.btn-banner-call {
    background-color: var(--mcafee-red);
    color: #ffffff;
    text-decoration: none;
    padding: 14px 28px;
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
}

.btn-banner-call span {
    font-weight: 700;
    font-size: 17px; /* Increased from 15px */
}

.btn-banner-call small {
    font-size: 13px;
    opacity: 0.9;
}

.btn-banner-call:hover {
    background-color: #9e0e13;
}

/* Footer */
.official-footer {
    background-color: #f7f7f7;
    border-top: 1px solid var(--border-color);
    color: var(--light-grey-text);
    padding: 45px 20px;
    text-align: center;
    font-size: 14px; /* Increased from 13px */
}

.footer-inner {
    max-width: 850px;
    margin: 0 auto;
}

.footer-info h4 {
    color: #222;
    font-size: 16px;
    margin-bottom: 8px;
}

.footer-legal {
    margin-top: 18px;
    color: #888;
    font-size: 13px;
}

/* ==========================================
   RESPONSIVE STICKY / FLOATING CALL BUTTON
   ========================================== */

/* DESKTOP DESIGN (Width > 768px) */
.sticky-call-wrapper {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
}

.btn-sticky-call {
    background-color: #ffffff;
    color: #222222;
    text-decoration: none;
    padding: 12px 20px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    transition: all 0.2s ease-in-out;
}

.btn-sticky-call:hover {
    border-color: var(--mcafee-red);
    box-shadow: 0 6px 24px rgba(192, 23, 29, 0.18);
    transform: translateY(-2px);
}

.sticky-icon {
    font-size: 20px;
    background-color: #fef2f2;
    color: var(--mcafee-red);
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sticky-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.sticky-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--light-grey-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sticky-number {
    font-size: 16px; /* Increased from 14px */
    font-weight: 700;
    color: var(--mcafee-red);
    line-height: 1.2;
}

/* MOBILE DESIGN (Width <= 768px) */
@media (max-width: 768px) {
    .sticky-call-wrapper {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        padding: 12px 16px;
        background-color: #ffffff;
        border-top: 1px solid var(--border-color);
        box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.08);
    }

    .btn-sticky-call {
        background-color: var(--call-green);
        color: #ffffff;
        border: none;
        border-radius: 8px;
        padding: 14px;
        justify-content: center;
        width: 100%;
        box-shadow: none;
    }

    .btn-sticky-call:hover {
        background-color: var(--call-green-hover);
        transform: none;
    }

    .sticky-icon {
        background-color: transparent;
        color: #ffffff;
        font-size: 22px;
        padding: 0;
    }

    .sticky-label {
        color: rgba(255, 255, 255, 0.9);
        font-size: 11px;
    }

    .sticky-number {
        color: #ffffff;
        font-size: 18px; /* High legibility on phones */
    }

    .official-footer {
        padding-bottom: 90px;
    }
}