:root {
    --primary: #05d8fc;
    --secondary: #017083;
    --on-primary: #111111;
    --on-secondary: #ffffff;
    --bg: #ffffff;
    --surface: #f6f8fb;
    --light: #e9edf3;
    --dark: #12151b;
    --muted: #566173;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--dark);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Space Grotesk', sans-serif;
    color: var(--dark);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
}

h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.section-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 700;
}

.lead {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    color: var(--muted);
}

.container {
    max-width: 1140px;
    padding-left: 1rem;
    padding-right: 1rem;
}

section {
    padding-block: clamp(56px, 8vw, 104px);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: auto;
    max-width: 100%;
    padding: 15px 30px;
    margin: 8px 0;
    gap: 10px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    box-sizing: border-box;
    cursor: pointer;
    transition: filter .25s ease, box-shadow .25s ease, transform .25s ease;
    min-height: 48px; /* Minimum tap target height */
}
.btn-sm {
    padding: 10px 20px;
    font-size: 14px;
}
.btn-lg {
    padding: 18px 36px;
    font-size: 18px;
}
.btn-cta {
    background: var(--primary);
    color: var(--on-primary) !important;
    box-shadow: 0 10px 24px -8px rgba(18,21,27,.35);
}
.btn-secondary {
    background: var(--secondary);
    color: var(--on-secondary) !important;
}
.btn-cta:hover, .btn-secondary:hover {
    filter: brightness(.94);
    box-shadow: 0 14px 30px -10px rgba(18,21,27,.45);
    transform: translateY(-2px);
}

@media (max-width: 575.98px) {
    .btn-cta, .btn-secondary {
        width: 100%;
        display: block;
    }
    .d-flex.flex-column.flex-md-row > .btn {
        width: 100%;
    }
}

/* Header */
.navbar {
    background-color: var(--bg);
    border-bottom: 1px solid var(--light);
    transition: background-color .3s ease, box-shadow .3s ease;
}

.navbar-brand img {
    max-height: 36px;
}

/* Hero Section */
.hero-section {
    background-color: var(--surface);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -10%;
    left: -10%;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle at 10% 20%, var(--primary) 0%, transparent 20%),
                radial-gradient(circle at 90% 80%, var(--secondary) 0%, transparent 20%);
    opacity: 0.1;
    z-index: 0;
}

.hero-section .eyebrow {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.hero-section .price-text {
    font-weight: 600;
    color: var(--muted);
    font-size: 1.125rem;
}

.hero-visual {
    background-image: linear-gradient(135deg, var(--secondary), var(--primary));
    color: var(--on-secondary);
    transform: rotate3d(1, 1, 0, 10deg) scale(0.95);
    box-shadow: 0 20px 40px -15px rgba(18,21,27,.3);
    border-radius: 20px;
    padding: 3rem !important;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 480px;
    width: 100%;
}

.hero-visual .icon-large {
    stroke-width: 1.2;
}

.hero-visual .tag {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--on-secondary);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
}

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

.hero-visual .text-on-secondary-muted {
    color: var(--on-secondary);
    opacity: 0.8;
}

/* Feature Cards */
.card-feature {
    background-color: var(--bg);
    border: 1px solid var(--light);
    border-radius: 16px;
    box-shadow: 0 1px 2px rgba(18,21,27,.06), 0 8px 20px -8px rgba(18,21,27,.12);
    transition: transform .25s ease, box-shadow .25s ease;
}

.card-feature:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 8px rgba(18,21,27,.08), 0 16px 32px -8px rgba(18,21,27,.16);
}

.feature-icon-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: var(--on-primary);
    border-radius: 12px;
    margin-bottom: 1rem;
}

.feature-icon-chip svg {
    stroke-width: 1.8;
}

/* Main Content Section (What's Included) */
.card-panel {
    background-color: var(--bg);
    border: 1px solid var(--light);
    border-radius: 16px;
    box-shadow: 0 1px 2px rgba(18,21,27,.06), 0 4px 12px -4px rgba(18,21,27,.08);
}

.feature-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--secondary);
    color: var(--on-secondary);
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
}

/* Offer Detail / Introduction */
.benefits-list li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

.benefits-list li:last-child {
    margin-bottom: 0;
}

.icon-sm {
    stroke-width: 2.5;
}

.intro-visual {
    background-color: var(--bg);
    border: 1px solid var(--light);
    box-shadow: 0 15px 35px -10px rgba(18,21,27,.15);
    max-width: 480px;
    width: 100%;
    transform: rotate3d(0, 1, 0, -8deg) scale(0.98);
    border-radius: 20px;
}

.intro-visual .icon-xxl {
    stroke-width: 1.3;
    color: var(--primary);
}

/* About Author */
.author-visual {
    background-color: var(--surface);
    border: 1px solid var(--light);
    box-shadow: 0 10px 25px -10px rgba(18,21,27,.1);
    max-width: 360px;
    width: 100%;
    margin: 0 auto;
    border-radius: 16px;
    padding: 2.5rem !important;
}

.avatar-fallback {
    width: 80px;
    height: 80px;
    background-color: var(--primary);
    color: var(--on-primary);
    font-size: 2.5rem;
    font-weight: 700;
}

/* Pricing Card */
.pricing-card {
    background-color: var(--bg);
    border: 1px solid var(--light);
    border-radius: 20px;
    box-shadow: 0 20px 40px -15px rgba(18,21,27,.2);
    padding: 3rem !important;
}

.pricing-card .eyebrow {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
}

.pricing-benefits-list li {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

.pricing-benefits-list li:last-child {
    margin-bottom: 0;
}

/* Final CTA Band */
.cta-band {
    background-image: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--on-secondary);
}

.cta-band .btn-secondary {
    background-color: var(--on-secondary);
    color: var(--dark) !important;
}

.cta-band .btn-secondary:hover {
    filter: brightness(.98);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -8px rgba(18,21,27,.3);
}

/* Footer */
footer {
    background-color: var(--dark);
    color: #aebedc;
    padding-block: 3rem;
}

footer img {
    filter: brightness(0) invert(1);
}

footer p {
    font-size: 0.9rem;
    color: var(--muted);
}

@media (max-width: 991.98px) {
    .hero-visual, .intro-visual, .author-visual {
        transform: none !important;
        box-shadow: 0 15px 35px -10px rgba(18,21,27,.15);
    }
}

@media (prefers-reduced-motion: reduce) {
    .btn,
    .card-feature,
    .hero-visual,
    .intro-visual,
    .author-visual {
        transition: none !important;
        transform: none !important;
    }
}