/* ==========================================================================
   Franklin Hayes — Layout 01
   ========================================================================== */

:root {
  --color-bg: #05080c;
  --color-bg-radial: #0c1a29;
  --color-panel-border: rgba(45, 158, 199, 0.35);
  --color-panel-bg: rgba(37, 150, 196, 0.05);
  --color-accent: #2596c4;
  --color-accent-light: #5fc2e8;
  --color-text: #edf1f4;
  --color-text-dim: #a7b1bc;
  --color-text-dimmer: #7c8792;

  --font-display: 'Oswald', sans-serif;
  --font-body: 'Barlow', sans-serif;

  --container-max: 1200px;
  --side-padding: clamp(1.25rem, 4vw, 3rem);
  --section-gap: clamp(2.5rem, 6vw, 4.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  background-image: radial-gradient(ellipse at 50% 30%, var(--color-bg-radial) 0%, var(--color-bg) 65%);
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--side-padding);
}

section {
  padding-block: var(--section-gap);
}

/* ------------------------- Buttons & links ------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  padding: 0.9rem 1.6rem;
  border: 1px solid var(--color-panel-border);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--color-accent-light);
  background-color: var(--color-panel-bg);
}

.btn--solid {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #04121a;
}

.btn--solid:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  color: var(--color-accent-light);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.link-arrow:hover {
  border-color: var(--color-accent-light);
}

/* ------------------------------ Header ------------------------------ */

.site-header {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) 0;
  text-align: center;
}

.logo-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.logo-stack__series {
  width: min(420px, 80%);
}

.logo-stack__name {
  width: min(560px, 90%);
}

.main-nav {
  margin-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.main-nav__list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  padding-block: 1.1rem;
}

.main-nav__list a {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.85rem;
  color: var(--color-text-dim);
  transition: color 0.2s ease;
}

.main-nav__list a:hover,
.main-nav__list a[aria-current="page"] {
  color: var(--color-accent-light);
}

.nav-toggle {
  display: none;
  margin-inline: auto;
  margin-top: 1.25rem;
  background: transparent;
  border: 1px solid var(--color-panel-border);
  color: var(--color-text);
  padding: 0.6rem 1rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.8rem;
}

/* ------------------------------- Hero -------------------------------- */

.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.hero__eyebrow-rule {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin-block: 1.25rem;
}

.hero__heading {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.05;
}

.hero__subtext {
  color: var(--color-text-dim);
  max-width: 46ch;
  font-size: 1.05rem;
}

.hero__actions {
  margin-top: 2rem;
}

.hero__media {
  aspect-ratio: 4 / 3;
  border: 1px dashed var(--color-panel-border);
  background: linear-gradient(160deg, rgba(37, 150, 196, 0.12), rgba(5, 8, 12, 0.4));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-text-dimmer);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  padding: 1rem;
}

/* --------------------------- Series banner --------------------------- */

.series-banner {
  padding-block: clamp(1.75rem, 4vw, 2.5rem);
  border: 1px solid var(--color-panel-border);
  background: var(--color-panel-bg);
}

.series-banner .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.series-banner__brand {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
}

.series-banner__logo {
  width: clamp(64px, 8vw, 96px);
}

.series-banner__tagline {
  color: var(--color-text-dim);
  margin-top: 0.35rem;
  font-size: 0.95rem;
}

/* -------------------------- Featured books ---------------------------- */

.section-heading {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  justify-content: center;
  margin-bottom: clamp(2rem, 5vw, 3rem);
  color: var(--color-accent-light);
  font-size: 1rem;
}

.section-heading::before,
.section-heading::after {
  content: "";
  height: 1px;
  width: clamp(30px, 8vw, 90px);
  background: var(--color-panel-border);
}

.book-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 3rem);
}

.book-card {
  display: grid;
  grid-template-columns: minmax(120px, 160px) 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.book-card__cover {
  aspect-ratio: 2 / 3;
  border: 1px dashed var(--color-panel-border);
  background: linear-gradient(160deg, rgba(37, 150, 196, 0.12), rgba(5, 8, 12, 0.4));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-text-dimmer);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  padding: 0.5rem;
}

.book-card__title {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  color: var(--color-accent-light);
}

.book-card__body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.book-card__desc {
  color: var(--color-text-dim);
}

.book-card__desc p + p {
  margin-top: 0.75rem;
}

/* ------------------------------ Newsletter ----------------------------- */

.newsletter {
  border: 1px solid var(--color-panel-border);
  background: var(--color-panel-bg);
  padding-block: clamp(1.75rem, 4vw, 2.5rem);
}

.newsletter .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.75rem;
}

.newsletter__intro {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  max-width: 44ch;
}

.newsletter__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  color: var(--color-accent-light);
}

.newsletter__title {
  font-size: 1.15rem;
  color: var(--color-accent-light);
}

.newsletter__desc {
  color: var(--color-text-dim);
  font-size: 0.95rem;
  margin-top: 0.35rem;
}

.newsletter__form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.newsletter__form input[type="email"] {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-panel-border);
  color: var(--color-text);
  padding: 0.9rem 1.1rem;
  font-family: var(--font-body);
  min-width: 240px;
}

.newsletter__form input[type="email"]::placeholder {
  color: var(--color-text-dimmer);
}

.newsletter__form input[type="email"]:focus,
.newsletter__form .btn:focus-visible {
  outline: 2px solid var(--color-accent-light);
  outline-offset: 2px;
}

/* -------------------------------- Footer -------------------------------- */

.site-footer {
  text-align: center;
  padding-block: clamp(2rem, 5vw, 3rem);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer__logo {
  width: min(320px, 70%);
  margin-inline: auto;
}

.site-footer__copy {
  margin-top: 1.25rem;
  color: var(--color-text-dimmer);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

/* ------------------------------- Page hero ------------------------------ */
/* Simple heading block used on interior pages (books, about, etc.) */

.page-hero {
  text-align: center;
}

.page-hero__heading {
  font-size: clamp(2rem, 5vw, 3rem);
}

.page-hero__subtext {
  color: var(--color-text-dim);
  max-width: 60ch;
  margin: 1rem auto 0;
}

/* ------------------------------ Responsive ------------------------------ */

@media (max-width: 860px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero__media {
    order: -1;
  }

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

  .newsletter .container {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  .newsletter__intro {
    flex-direction: column;
    align-items: center;
    max-width: none;
  }

  .newsletter__form {
    justify-content: center;
  }

  .series-banner .container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 700px) {
  .nav-toggle {
    display: inline-flex;
  }

  .main-nav__list {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding-block: 1.25rem;
  }

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

  .book-card {
    grid-template-columns: 120px 1fr;
  }
}

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

  .book-card__cover {
    max-width: 160px;
    margin-inline: auto;
  }

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

  .newsletter__form {
    flex-direction: column;
    align-items: stretch;
  }

  .newsletter__form input[type="email"] {
    min-width: 0;
  }
}