/* ------------------------------
   BASE
------------------------------ */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Inter", Arial, sans-serif;
    color: #172033;
    background: #ffffff;
    line-height: 1.7;
}

.container {
    width: min(1120px, 90%);
    margin: 0 auto;
}

.narrow {
    max-width: 760px;
}


/* ------------------------------
   NAVIGATION
------------------------------ */

.navbar {
    background: #ffffff;
    border-bottom: 1px solid #e8edf3;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    min-height: 76px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    color: #102A43;
    font-weight: 800;
    text-decoration: none;
    letter-spacing: -0.02em;
}

nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

nav a {
    color: #425466;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

nav a:hover {
    color: #2563EB;
}

.nav-button {
    background: #2563EB;
    color: white !important;
    padding: 11px 18px;
    border-radius: 6px;
}


/* ------------------------------
   HERO
------------------------------ */

.hero {
    background: #F3F7FC;
    padding: 100px 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 90px;
    align-items: center;
}

.eyebrow {
    color: #2563EB;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.12em;
    margin-bottom: 18px;
}

.hero h1 {
    color: #102A43;
    font-size: clamp(48px, 6vw, 74px);
    line-height: 1.03;
    letter-spacing: -0.045em;
    margin: 0 0 22px;
}

.hero h2 {
    font-size: 24px;
    line-height: 1.45;
    font-weight: 500;
    color: #425466;
    margin: 0 0 26px;
}

.hero-description {
    font-size: 18px;
    color: #5F6B7A;
    max-width: 620px;
}

.book-visual {
    text-align: center;
}

.book-visual img {
    width: 100%;
    max-width: 380px;
    box-shadow: 0 30px 60px rgba(16, 42, 67, 0.2);
}

.hero-buttons,
.cta-buttons {
    display: flex;
    gap: 14px;
    margin-top: 32px;
}

.button {
    display: inline-block;
    text-decoration: none;
    font-weight: 600;
    padding: 14px 23px;
    border-radius: 6px;
    transition: 0.2s;
}

.primary {
    background: #2563EB;
    color: white;
}

.primary:hover {
    background: #1d4ed8;
}

.secondary {
    border: 1px solid #cbd5e1;
    color: #102A43;
    background: white;
}

.availability {
    color: #7b8794;
    font-size: 13px;
    margin-top: 20px;
}


/* ------------------------------
   TESTIMONIAL
------------------------------ */

.testimonial {
    background: #102A43;
    color: white;
    padding: 70px 0;
}

.testimonial-inner {
    max-width: 850px;
    text-align: center;
}

.quote {
    font-size: 27px;
    line-height: 1.5;
    font-weight: 500;
    margin: 0;
}

.quote-author {
    color: #b9c8d8;
    margin-top: 22px;
}


/* ------------------------------
   GENERAL SECTIONS
------------------------------ */

.section {
    padding: 110px 0;
}

.light-section {
    background: #F7F9FC;
}

.section-heading {
    max-width: 700px;
    margin-bottom: 50px;
}

.section-title {
    color: #102A43;
    font-size: 42px;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin: 0 0 25px;
}

.large-text {
    font-size: 21px;
    color: #425466;
}


/* ------------------------------
   CARDS
------------------------------ */

.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: white;
    padding: 36px;
    border: 1px solid #e4eaf0;
    border-radius: 8px;
}

.card-number {
    color: #2563EB;
    font-size: 13px;
    font-weight: 700;
}

.card h3 {
    color: #102A43;
    font-size: 21px;
    margin: 18px 0 12px;
}

.card p {
    color: #5F6B7A;
    margin: 0;
}


/* ------------------------------
   AUTHOR
------------------------------ */

.author-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 80px;
    align-items: center;
}

.author-placeholder {
    background: #E8EFF7;
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #69809A;
}


/* ------------------------------
   CTA
------------------------------ */

.cta {
    background: #2563EB;
    color: white;
    padding: 100px 0;
}

.cta-inner {
    text-align: center;
    max-width: 800px;
}

.cta h2 {
    font-size: 48px;
    margin: 5px 0 15px;
    letter-spacing: -0.03em;
}

.light-eyebrow {
    color: #bfdbfe;
}

.cta-buttons {
    justify-content: center;
}

.white-button {
    background: white;
    color: #1D4ED8;
}

.outline-white {
    border: 1px solid rgba(255,255,255,.6);
    color: white;
}


/* ------------------------------
   FOOTER
------------------------------ */

footer {
    background: #0B1F33;
    color: #AAB8C5;
    padding: 35px 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}


/* ------------------------------
   MOBILE
------------------------------ */

@media (max-width: 800px) {

    nav a:not(.nav-button) {
        display: none;
    }

    .hero {
        padding: 70px 0;
    }

    .hero-grid,
    .author-grid {
        grid-template-columns: 1fr;
    }

    .hero-content {
        order: 2;
    }

    .book-visual {
        order: 1;
    }

    .cards {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 75px 0;
    }

    .footer-inner {
        flex-direction: column;
    }

}