/* ===== RD Machine — Design System ===== */

:root {
    --color-black: #14120f;
    --color-orange: #e8590c;
    --color-orange-dark: #c94a08;
    --color-white: #ffffff;
    --color-gray-light: #f5f4f2;
    --color-gray: #8a8580;
    --color-gray-dark: #3a3733;
    --color-border: #e5e2dd;

    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;

    --container-width: 1140px;
    --container-narrow: 640px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-main);
    color: var(--color-black);
    background: var(--color-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.container--narrow {
    max-width: var(--container-narrow);
}

/* ===== Botões ===== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-orange);
    color: var(--color-white);
}

.btn--primary:hover {
    background: var(--color-orange-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(232, 89, 12, 0.3);
}

.btn--outline {
    background: transparent;
    border-color: var(--color-white);
    color: var(--color-white);
}

.btn--outline:hover {
    background: var(--color-white);
    color: var(--color-black);
}

.section:not(.section--dark) .btn--outline {
    border-color: var(--color-black);
    color: var(--color-black);
}

.section:not(.section--dark) .btn--outline:hover {
    background: var(--color-black);
    color: var(--color-white);
}

.btn--lg {
    padding: 16px 36px;
    font-size: 1.05rem;
}

.btn--sm {
    padding: 9px 18px;
    font-size: 0.875rem;
}

.btn--block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== Header ===== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
    color: var(--color-black);
}

.logo span {
    color: var(--color-orange);
}

.logo__icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    display: block;
    transition: transform 0.25s ease;
}

.logo:hover .logo__icon {
    transform: rotate(-8deg) scale(1.08);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
    font-weight: 500;
    font-size: 0.95rem;
}

.main-nav a:hover {
    color: var(--color-orange);
}

.main-nav__cta {
    background: var(--color-black);
    color: var(--color-white) !important;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
}

.main-nav__cta:hover {
    background: var(--color-orange);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--color-black);
    border-radius: 2px;
}

/* ===== Hero ===== */

.hero {
    background: var(--color-black);
    color: var(--color-white);
    padding: 120px 0 100px;
    text-align: center;
}

.hero__inner {
    max-width: 780px;
}

.hero h1 {
    font-size: clamp(2.4rem, 5.5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.08;
    margin: 0 0 20px;
}

.hero h1 span {
    color: var(--color-orange);
}

.hero__subheadline {
    font-size: 1.2rem;
    color: #c9c6c1;
    margin: 0 0 36px;
}

/* ===== Sections ===== */

.section {
    padding: 96px 0;
}

.section--tight {
    padding: 64px 0;
}

.section--dark {
    background: var(--color-black);
    color: var(--color-white);
}

.section--dark .ebook-card {
    background: #1f1c18;
}

.section--dark .ebook-card__category {
    color: #d9d5cf;
}

.section__title {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin: 0 0 16px;
    text-align: center;
}

.section__lead {
    max-width: 640px;
    margin: 0 auto 48px;
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-gray);
}

.section--dark .section__lead {
    color: #b9b5af;
}

.section__cta {
    text-align: center;
    margin-top: 40px;
}

.section__eyebrow {
    display: block;
    text-align: center;
    color: var(--color-orange);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

/* ===== Estatísticas ===== */

.stats-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px 56px;
    margin: -12px 0 48px;
}

.stat {
    text-align: center;
}

.stat__number {
    display: block;
    font-size: clamp(2rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-orange);
}

.stat__label {
    display: block;
    max-width: 220px;
    margin: 6px auto 0;
    font-size: 0.85rem;
    color: #b9b5af;
}

/* ===== Sobre / Autores ===== */

.authors {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.author-card {
    background: var(--color-gray-light);
    border-radius: var(--radius-md);
    padding: 32px;
    text-align: center;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

.author-card__avatar {
    width: 148px;
    height: 148px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 20px;
    border: 4px solid var(--color-orange);
    box-shadow: 0 10px 24px rgba(232, 89, 12, 0.35);
}

.author-card h3 {
    margin: 0 0 4px;
    font-size: 1.35rem;
    color: var(--color-black);
}

.author-card__role {
    display: block;
    color: var(--color-orange);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 14px;
}

.author-card p {
    margin: 0;
    color: var(--color-gray);
    font-size: 0.95rem;
}

/* ===== Tópicos (o que você vai aprender) ===== */

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.topic-card {
    background: #1f1c18;
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
}

.topic-card__icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.topic-card h3 {
    margin: 0 0 8px;
    font-size: 1.05rem;
    color: var(--color-white);
}

.topic-card p {
    margin: 0;
    color: #b9b5af;
    font-size: 0.9rem;
}

/* ===== Formulário de lead ===== */

.lead-form {
    background: var(--color-gray-light);
    border-radius: var(--radius-lg);
    padding: 40px;
    display: grid;
    gap: 20px;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-row label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-black);
}

.form-row input,
.form-row select {
    padding: 13px 16px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
    font-family: var(--font-main);
    font-size: 1rem;
    background: var(--color-white);
    color: var(--color-black);
}

.form-row input:focus,
.form-row select:focus {
    outline: none;
    border-color: var(--color-orange);
}

.lead-form__error {
    background: #fdeceb;
    color: #b3261e;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin: 0;
}

.lead-form__success {
    background: var(--color-gray-light);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
}

.lead-form__success h3 {
    font-size: 1.6rem;
    margin: 0 0 12px;
    color: var(--color-black);
}

.lead-form__success p {
    color: var(--color-gray);
    margin: 0;
}

/* ===== Grid de e-books ===== */

.ebooks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 28px;
}

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

.ebook-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.section--dark .ebook-card {
    border-color: #2c2822;
}

a.ebook-card:hover,
.ebook-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}

.ebook-card__cover-link {
    display: block;
}

.ebook-card__cover {
    aspect-ratio: 3 / 4;
    background: linear-gradient(145deg, var(--color-black), #2c2822);
    color: var(--color-white);
    position: relative;
    overflow: hidden;
    container-type: inline-size;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    text-align: center;
}

/* ===== Arte das capas de e-book ===== */

.cover-dots {
    position: absolute;
    top: 5cqw;
    left: 5cqw;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25cqw;
}

.cover-dots span {
    width: 0.56cqw;
    height: 0.56cqw;
    min-width: 2px;
    min-height: 2px;
    border-radius: 50%;
    background: var(--color-orange);
    opacity: 0.55;
}

.cover-ribbon {
    position: absolute;
    width: 36.11cqw;
    height: 4.72cqw;
    background: var(--color-orange);
    transform: rotate(-45deg);
    right: -11.11cqw;
    bottom: 9.72cqw;
    opacity: 0.85;
}

.cover-eyebrow {
    margin-top: 4cqw;
    display: flex;
    align-items: center;
    gap: 1.94cqw;
}

.cover-dash {
    width: 3.61cqw;
    height: 2px;
    background: var(--color-orange);
    flex-shrink: 0;
}

.cover-category {
    color: var(--color-orange);
    font-weight: 700;
    font-size: clamp(8px, 1.9cqw, 12px);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    white-space: nowrap;
}

.cover-frame {
    margin-top: 6cqw;
    width: 44cqw;
    height: 44cqw;
    position: relative;
    flex-shrink: 0;
}

.cover-frame-border {
    position: absolute;
    inset: 0;
    border: 2px solid rgba(255, 255, 255, 0.16);
    border-radius: 0.9cqw;
    background: rgba(255, 255, 255, 0.025);
}

.cover-corner {
    position: absolute;
    width: 0;
    height: 0;
}

.cover-corner--tl {
    top: 0;
    left: 0;
    border-style: solid;
    border-width: 4cqw 4cqw 0 0;
    border-color: var(--color-orange) transparent transparent transparent;
}

.cover-corner--br {
    bottom: 0;
    right: 0;
    border-style: solid;
    border-width: 0 0 4cqw 4cqw;
    border-color: transparent transparent var(--color-orange) transparent;
}

.cover-icon {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cover-icon svg {
    width: 23cqw;
    height: 23cqw;
}

.cover-title {
    font-family: 'Anton', sans-serif;
    font-weight: 400;
    margin: 5cqw 0 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
    text-transform: uppercase;
}

.cover-title span {
    font-size: clamp(15px, 6.2cqw, 26px);
    line-height: 1.08;
    color: var(--color-white);
}

.cover-title__accent {
    color: var(--color-orange);
}

.cover-footer {
    margin-top: auto;
    padding-top: 4cqw;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.4cqw;
}

.cover-rule {
    width: 6cqw;
    height: 1px;
    background: rgba(255, 255, 255, 0.25);
}

.cover-logo {
    font-weight: 800;
    font-size: clamp(9px, 2.3cqw, 13px);
    letter-spacing: -0.01em;
    color: var(--color-white);
}

.cover-logo span {
    color: var(--color-orange);
    font-weight: 800;
}

.ebook-card__body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.ebook-card__category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-orange);
    font-weight: 700;
}

.ebook-card__body h3 {
    margin: 0;
    font-size: 1.05rem;
}

.ebook-card__body p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-gray);
    flex: 1;
}

.ebook-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
}

.ebook-card__price {
    font-weight: 700;
    font-size: 1.05rem;
}

.ebook-card__price--free {
    color: var(--color-orange);
    font-weight: 700;
    font-size: 0.85rem;
}

/* ===== Filtros ===== */

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 40px;
}

.filter-btn {
    background: var(--color-gray-light);
    border: 1.5px solid transparent;
    color: var(--color-black);
    padding: 9px 18px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.filter-btn:hover {
    border-color: var(--color-orange);
}

.filter-btn.is-active {
    background: var(--color-orange);
    color: var(--color-white);
}

/* ===== Página individual do e-book ===== */

.breadcrumb {
    font-size: 0.875rem;
    color: var(--color-gray);
    margin-bottom: 32px;
}

.breadcrumb a:hover {
    color: var(--color-orange);
}

.ebook-detail {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 48px;
    align-items: start;
}

.ebook-detail__cover {
    aspect-ratio: 3 / 4;
    background: linear-gradient(145deg, var(--color-black), #2c2822);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
    container-type: inline-size;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 32px;
    text-align: center;
}

.ebook-detail__info h1 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    margin: 12px 0 20px;
    letter-spacing: -0.02em;
}

.ebook-detail__description {
    color: var(--color-gray-dark);
    font-size: 1.05rem;
    margin: 0 0 32px;
}

.ebook-detail__buy {
    display: flex;
    align-items: center;
    gap: 24px;
}

.ebook-detail__price {
    font-size: 1.6rem;
    font-weight: 800;
}

.ebook-detail__price--free {
    font-size: 1.15rem;
    color: var(--color-orange);
}

/* ===== Footer ===== */

.site-footer {
    background: var(--color-black);
    color: #c9c6c1;
}

.site-footer__inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding: 64px 0 40px;
}

.footer-logo {
    height: 46px;
    width: auto;
    filter: drop-shadow(0 0 14px rgba(232, 89, 12, 0.45));
}

.site-footer__brand p {
    font-size: 0.9rem;
    margin-top: 12px;
}

.site-footer h4 {
    color: var(--color-white);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin: 0 0 16px;
}

.site-footer__links,
.site-footer__contact {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.9rem;
}

.site-footer__links a:hover,
.site-footer__contact a:hover {
    color: var(--color-orange);
}

.site-footer__bottom {
    border-top: 1px solid #2c2822;
    padding: 20px 0;
    font-size: 0.8rem;
    text-align: center;
    color: #8a8580;
}

/* ===== Responsivo ===== */

@media (max-width: 900px) {
    .ebooks-grid--preview {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .ebook-detail {
        grid-template-columns: 1fr;
    }

    .ebook-detail__cover {
        max-width: 280px;
        margin: 0 auto;
    }

    .site-footer__inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 720px) {
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
        display: none;
    }

    .main-nav.is-open {
        display: flex;
    }

    .main-nav__cta {
        text-align: center;
    }

    .hero {
        padding: 90px 0 70px;
    }

    .section {
        padding: 64px 0;
    }

    .lead-form {
        padding: 28px 20px;
    }

    .ebooks-grid--preview {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .ebooks-grid--preview {
        grid-template-columns: 1fr;
    }

    .ebook-detail__buy {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
}