@layer reset, base, layout, components;

@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
  }
}

@layer base {
  :root {
    --color-bg: #fff;
    --color-bg-dark: oklch(0.14 0.02 50);
    --color-text: oklch(0.18 0.02 60);
    --color-text-muted: oklch(0.45 0.02 55);
    --color-text-subtle: oklch(0.6 0.01 60);
    --color-accent: oklch(0.42 0.12 45);
    --color-accent-hover: oklch(0.35 0.14 45);
    --color-border: oklch(0.85 0.01 55);
    --color-gold: oklch(0.72 0.14 70);
    --color-gold-dim: oklch(0.55 0.1 65);

    --font-display: "Times New Roman", Georgia, serif;
    --font-body: system-ui, -apple-system, "Segoe UI", sans-serif;

    --measure: 680px;
    --page-gutter: clamp(1.25rem, 5vw, 3rem);
  }

  html {
    scroll-behavior: smooth;
    font-family: var(--font-body);
    background: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  body {
    min-block-size: 100dvh;
    display: flex;
    flex-direction: column;
  }

  ::selection {
    background: oklch(0.72 0.14 70 / 0.25);
  }
}

@layer layout {
  main {
    flex: 1;
  }

  .blurb-inner {
    max-inline-size: var(--measure);
    margin-inline: auto;
    padding-inline: var(--page-gutter);
  }
}

@layer components {
  /* ── Header ── */

  .site-header {
    position: absolute;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: 10;
    padding-block: clamp(1.25rem, 3vw, 2rem);
    text-align: center;
  }

  .site-name {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: oklch(0.85 0.03 65);
  }

  /* ── Hero ── */

  .hero {
    position: relative;
    min-block-size: 100svh;
    display: flex;
    overflow: hidden;
  }

  .hero-bg {
    position: absolute;
    inset: 0;
  }

  .hero-bg picture {
    display: block;
    inline-size: 100%;
    block-size: 100%;
  }

  .hero-bg img {
    display: block;
    inline-size: 100%;
    block-size: 100%;
    object-fit: cover;
    object-position: center 60%;
  }

  /* gradient: cinematic dark base with warm atmosphere */
  .hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse 80% 50% at 30% 80%, oklch(0.2 0.06 50 / 0.4) 0%, transparent 70%),
      linear-gradient(
        to top,
        oklch(0.08 0.02 50 / 0.92) 0%,
        oklch(0.1 0.02 50 / 0.7) 35%,
        oklch(0.1 0.02 50 / 0.35) 65%,
        oklch(0.1 0.02 50 / 0.2) 100%
      );
  }

  .hero-overlay {
    position: relative;
    z-index: 1;
    inline-size: 100%;
    max-inline-size: 1100px;
    margin-inline: auto;
    padding-inline: var(--page-gutter);
    padding-block: clamp(6rem, 15vw, 10rem) clamp(4rem, 10vw, 6rem);
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(2rem, 5vw, 3rem);
    align-items: end;
  }

  @media (min-width: 680px) {
    .hero-overlay {
      grid-template-columns: 1fr auto;
      gap: clamp(2rem, 4vw, 5rem);
    }
  }

  #book-title {
    font-family: var(--font-body);
    font-size: clamp(2.4rem, 5vw + 1rem, 4.5rem);
    font-weight: 600;
    line-height: 0.95;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #fff;
    text-shadow: 0 2px 40px oklch(0.2 0.05 50 / 0.5);
    margin-block-end: 0.4em;
  }

  .hero-tagline {
    font-size: clamp(0.9rem, 1vw + 0.5rem, 1.1rem);
    color: oklch(0.78 0.04 65);
    letter-spacing: 0.02em;
    line-height: 1.5;
    margin-block-end: clamp(1.5rem, 4vw, 2.5rem);
  }

  /* ── Hero book ── */

  .hero-book {
    display: flex;
    justify-content: center;
    order: -1;
  }

  .hero-book picture {
    position: relative;
  }

  .hero-book picture::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
      to top,
      oklch(0.08 0.03 50 / 0.85) 0%,
      oklch(0.1 0.03 50 / 0.4) 25%,
      transparent 45%
    );
    pointer-events: none;
  }

  .hero-book img {
    display: block;
    max-inline-size: 240px;
    block-size: auto;
    filter: drop-shadow(0 16px 60px oklch(0 0 0 / 0.7)) brightness(0.85) sepia(0.15) saturate(0.9);
  }

  @media (min-width: 680px) {
    .hero-book {
      order: 0;
      align-items: flex-end;
    }

    .hero-book img {
      max-inline-size: clamp(200px, 25vw, 380px);
    }
  }

  /* ── Scroll hint ── */

  .hero-scroll {
    position: absolute;
    inset-inline: 0;
    inset-block-end: clamp(1.5rem, 3vw, 2.5rem);
    z-index: 1;
    text-align: center;
    animation: fade-bob 3s ease-in-out infinite;
  }

  .hero-scroll svg {
    inline-size: 24px;
    block-size: 24px;
    color: oklch(0.8 0.03 65 / 0.6);
  }

  @keyframes fade-bob {
    0%,
    100% {
      opacity: 0.5;
      transform: translateY(0);
    }
    50% {
      opacity: 1;
      transform: translateY(6px);
    }
  }

  /* ── Pill ── */

  .pill {
    display: inline-block;
    padding: 0.3em 1em;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-bg-dark);
    background: oklch(0.88 0.04 65);
    border-radius: 100px;
    margin-block-end: 1rem;
  }

  /* ── Buttons ── */

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7em 1.8em;
    min-block-size: 44px;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--color-bg-dark);
    background: var(--color-gold);
    text-decoration: none;
    border: 1px solid oklch(0.72 0.1 60 / 0.3);
    border-radius: 6px;
    transition:
      background 0.2s ease,
      transform 0.15s ease;

    &:hover {
      background: var(--color-gold-dim);
      transform: translateY(-1px);
    }

    &:focus-visible {
      outline: 2px solid var(--color-gold);
      outline-offset: 3px;
    }
  }

  .btn--outline {
    background: transparent;
    color: var(--color-accent);
    border: 1.5px solid var(--color-border);

    &:hover {
      background: var(--color-accent);
      color: #fff;
      border-color: var(--color-accent);
    }
  }

  /* ── Blurb ── */

  .blurb {
    padding-block: clamp(4rem, 10vw, 7rem);
    background: image-set(
        url("media/paper-texture.avif") type("image/avif"),
        url("media/paper-texture.webp") type("image/webp"),
        url("media/paper-texture.png") type("image/png")
      ),
      var(--color-bg);
    background-blend-mode: multiply;
  }

  .blurb-lead {
    font-family: var(--font-display);
    font-size: clamp(1.35rem, 2vw + 0.5rem, 1.85rem);
    line-height: 1.4;
    font-weight: 400;
    font-style: italic;
    color: var(--color-text);
    margin-block-end: clamp(1.5rem, 4vw, 2.5rem);
    text-wrap: balance;
  }

  .blurb-body p {
    font-size: clamp(1rem, 1vw + 0.5rem, 1.08rem);
    color: var(--color-text-muted);
    line-height: 1.75;
    text-wrap: pretty;
    margin-block-end: 1.2em;

    &:last-child {
      margin-block-end: 0;
    }
  }

  /* ── Bottom CTA ── */

  .cta-section {
    background: var(--color-bg-dark);
    padding-block: clamp(4rem, 10vw, 7rem);
    padding-inline: var(--page-gutter);
  }

  .cta-inner {
    max-inline-size: 900px;
    margin-inline: auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(2.5rem, 5vw, 4rem);
    align-items: center;
  }

  @media (min-width: 640px) {
    .cta-inner {
      grid-template-columns: auto 1fr;
    }
  }

  .cta-book {
    justify-self: center;
  }

  .cta-book img {
    display: block;
    max-inline-size: clamp(160px, 20vw, 220px);
    block-size: auto;
    border-radius: 4px;
    box-shadow:
      0 8px 40px oklch(0 0 0 / 0.5),
      0 2px 12px oklch(0 0 0 / 0.3);
  }

  .cta-text {
    text-align: center;
  }

  @media (min-width: 640px) {
    .cta-text {
      text-align: start;
    }
  }

  .cta-label {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gold-dim);
    margin-block-end: 0.6rem;
  }

  .cta-headline {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3vw + 0.5rem, 2.4rem);
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-bg);
    margin-block-end: 0.8rem;
  }

  .cta-desc {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-subtle);
    margin-block-end: clamp(1.5rem, 3vw, 2rem);
    max-inline-size: 440px;
  }

  @media (min-width: 640px) {
    .cta-desc {
      margin-inline: 0;
    }
  }

  @media (max-width: 639px) {
    .cta-desc {
      margin-inline: auto;
    }
  }

  /* ── Testimonial ── */

  .testimonial {
    border-inline-start: 2px solid var(--color-gold-dim);
    padding-inline-start: 1.2rem;
    margin-block-end: clamp(1.5rem, 3vw, 2.5rem);
    max-inline-size: 440px;
  }

  .testimonial-text {
    font-family: var(--font-display);
    font-size: clamp(0.95rem, 1vw + 0.5rem, 1.08rem);
    font-style: italic;
    line-height: 1.6;
    color: var(--color-border);
  }

  .testimonial-cite {
    display: block;
    margin-block-start: 0.5rem;
    font-size: 0.78rem;
    font-style: normal;
    letter-spacing: 0.03em;
    color: var(--color-gold-dim);
  }

  /* ── Store links ── */

  .store-links {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
  }

  @media (min-width: 640px) {
    .store-links {
      justify-content: start;
    }
  }

  .btn--store {
    background: transparent;
    color: var(--color-border);
    border: 1px solid var(--color-text-muted);
    font-size: 0.82rem;
    padding: 0.55em 1.2em;

    &:hover {
      background: var(--color-gold);
      color: var(--color-bg-dark);
      border-color: var(--color-gold);
    }
  }

  /* ── Footer ── */

  .site-footer {
    background: var(--color-bg-dark);
    padding-block: clamp(2rem, 4vw, 3rem);
    padding-inline: var(--page-gutter);
    border-block-start: 1px solid oklch(1 0 0 / 0.06);

    & p {
      max-inline-size: 900px;
      margin-inline: auto;
      font-size: 0.75rem;
      color: var(--color-text-muted);
      letter-spacing: 0.02em;
    }
  }
}