/* Reset e configurações básicas */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Variáveis de cores */
:root {
    --navy-blue: #0A3D62;
    --strong-red: #B30000;
    --text-dark: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
}

/* Tipografia base - Mobile First */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container principal */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header e Navegação - Otimizado para Mobile */
header {
    background-color: var(--navy-blue);
    color: var(--white);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 0;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    width: 100%;
}

nav a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem;
    display: block;
}

nav a:hover,
nav a:active {
    color: var(--strong-red);
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 1.5rem 0;
}

/* Títulos - Mobile First */
h1 {
    color: var(--navy-blue);
    font-size: 1.75rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

h2 {
    color: var(--navy-blue);
    font-size: 1.4rem;
    margin-top: 1.5rem;
    margin-bottom: 0.875rem;
}

h3 {
    color: var(--navy-blue);
    font-size: 1.15rem;
    margin-top: 1.25rem;
    margin-bottom: 0.625rem;
}

/* Parágrafos */
p {
    margin-bottom: 1rem;
    color: var(--text-dark);
    line-height: 1.7;
}

/* Listas */
ul {
    margin-left: 1.25rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Hero Section - Mobile Optimized */
.hero {
    text-align: center;
    padding: 2rem 0;
    background-color: var(--bg-light);
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: 1.85rem;
    margin-bottom: 0.875rem;
    padding: 0 0.5rem;
}

.hero p {
    font-size: 1rem;
    color: var(--text-light);
    max-width: 100%;
    margin: 0 auto 1.5rem;
    padding: 0 0.5rem;
}

/* Imagens - Mobile Optimized */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

.book-cover {
    max-width: 280px;
    width: 100%;
    margin: 1.5rem auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    border-radius: 8px;
}

.biography-image {
    max-width: 250px;
    width: 100%;
    margin: 1.25rem auto;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Botões CTA - Touch Optimized */
.cta-button {
    display: block;
    background-color: var(--strong-red);
    color: var(--white);
    padding: 1rem 1.5rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    font-size: 1.05rem;
    transition: background-color 0.3s ease, transform 0.2s ease;
    margin: 1rem auto;
    text-align: center;
    max-width: 100%;
    width: 100%;
    /* Touch target size mínimo de 44px */
    min-height: 44px;
    line-height: 1.4;
}

.cta-button:hover,
.cta-button:active {
    background-color: #8B0000;
    transform: translateY(-1px);
}

.cta-button-large {
    font-size: 1.15rem;
    padding: 1.125rem 1.75rem;
    font-weight: 700;
}

/* Seção de preço - Mobile Optimized */
.price-section {
    text-align: center;
    background-color: var(--bg-light);
    padding: 1.5rem 1rem;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.price {
    font-size: 2.5rem;
    color: var(--strong-red);
    font-weight: bold;
    margin: 1rem 0;
    line-height: 1;
}

/* Content sections - Mobile Optimized */
.content-section {
    margin: 1.5rem 0;
    padding: 1.25rem;
    background-color: var(--white);
}

.content-section.highlight {
    background-color: var(--bg-light);
    border-left: 4px solid var(--navy-blue);
    padding-left: 1.25rem;
}

/* CTA Box - Mobile Optimized */
.cta-box {
    background-color: var(--navy-blue);
    color: var(--white);
    padding: 1.5rem 1rem;
    border-radius: 8px;
    text-align: center;
    margin: 2rem 0;
}

.cta-box h2 {
    color: var(--white);
    margin-top: 0;
    font-size: 1.35rem;
}

.cta-box p {
    color: var(--white);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

/* Biography content */
.biography-content {
    max-width: 800px;
    margin: 0 auto;
}

/* Footer - Mobile Optimized */
footer {
    background-color: var(--navy-blue);
    color: var(--white);
    text-align: center;
    padding: 1.5rem 1rem;
    margin-top: 3rem;
}

footer p {
    color: var(--white);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

footer a {
    color: var(--strong-red);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Contact Form - Mobile Optimized */
.contact-info {
    max-width: 600px;
    margin: 1.5rem auto;
    padding: 1.25rem;
    background-color: var(--bg-light);
    border-radius: 8px;
}

.contact-info h3 {
    margin-top: 0;
}

.contact-info p {
    margin-bottom: 0.5rem;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

/* Tablet - 600px+ */
@media (min-width: 600px) {
    .container {
        padding: 0 24px;
    }

    h1 {
        font-size: 2rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .book-cover {
        max-width: 350px;
    }

    .biography-image {
        max-width: 280px;
    }

    .cta-button {
        max-width: 400px;
    }

    .content-section {
        padding: 1.75rem;
    }

    .cta-box {
        padding: 2rem 1.5rem;
    }

    nav ul {
        width: auto;
        justify-content: flex-end;
    }

    nav a {
        font-size: 1rem;
    }

    .logo {
        font-size: 1.5rem;
    }
}

/* Desktop - 768px+ */
@media (min-width: 768px) {
    .container {
        padding: 0 32px;
    }

    main {
        padding: 2rem 0;
    }

    h1 {
        font-size: 2.25rem;
    }

    .hero {
        padding: 3rem 0;
        margin-bottom: 2rem;
    }

    .hero h1 {
        font-size: 2.75rem;
        padding: 0;
    }

    .hero p {
        font-size: 1.2rem;
        max-width: 800px;
        padding: 0;
        margin: 0 auto 2rem;
    }

    h2 {
        font-size: 1.65rem;
        margin-top: 2rem;
    }

    h3 {
        font-size: 1.3rem;
    }

    .book-cover {
        max-width: 400px;
        margin: 2rem auto;
    }

    .biography-image {
        max-width: 300px;
        margin: 1.5rem auto;
    }

    .cta-button {
        display: inline-block;
        width: auto;
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }

    .cta-button-large {
        font-size: 1.3rem;
        padding: 1.25rem 2.5rem;
    }

    .price {
        font-size: 3rem;
    }

    .price-section {
        padding: 2rem;
        margin: 2rem 0;
    }

    .content-section {
        margin: 2rem 0;
        padding: 2rem;
    }

    .content-section.highlight {
        padding-left: 2rem;
    }

    .cta-box {
        padding: 2rem;
        margin: 3rem 0;
    }

    .cta-box h2 {
        font-size: 1.5rem;
    }

    .contact-info {
        margin: 2rem auto;
        padding: 2rem;
    }

    footer {
        padding: 2rem 0;
        margin-top: 4rem;
    }

    footer p {
        font-size: 1rem;
    }

    header {
        padding: 1rem 0;
    }

    nav ul {
        gap: 1.5rem;
    }
}

/* Large Desktop - 1024px+ */
@media (min-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 1.75rem;
    }
}

/* Improved Touch Targets for Mobile */
@media (hover: none) and (pointer: coarse) {
    /* Aumentar áreas de toque em dispositivos touch */
    nav a {
        padding: 0.75rem 1rem;
    }

    .cta-button {
        min-height: 48px;
        font-size: 1.1rem;
    }
}