/* Zen Productivity — minimal, sharp, calm */

:root {
  --bg: #f6f4ef;
  --bg-warm: #efeae2;
  --ink: #14120f;
  --ink-muted: #4a4540;
  --line: rgba(20, 18, 15, 0.12);
  --accent: #8c2c2c;
  --accent-soft: rgba(140, 44, 44, 0.08);
  --dark: #0e0d0c;
  --dark-elevated: #1a1816;
  --on-dark: #f0ebe3;
  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --max: 68rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  background: var(--ink);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  left: var(--space-sm);
  top: var(--space-sm);
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.25s var(--ease);
}

.site-header--scrolled {
  box-shadow: 0 10px 30px rgba(20, 18, 15, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-sm);
}

.logo {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav a {
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--accent);
}

.nav__buy {
  color: var(--accent);
  font-weight: 700;
}

.nav__buy:hover,
.nav__buy:focus-visible {
  color: var(--ink);
}

/* Hero */

.hero {
  padding-block: var(--space-xl) var(--space-lg);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse 80% 50% at 100% 0%, var(--accent-soft), transparent 55%),
    var(--bg);
}

.hero__grid {
  display: grid;
  gap: var(--space-lg);
  align-items: start;
}

@media (min-width: 900px) {
  .hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: var(--space-xl);
  }
}

.eyebrow {
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero__title {
  margin: 0 0 var(--space-md);
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero__lead {
  margin: 0 0 var(--space-md);
  max-width: 38rem;
  color: var(--ink-muted);
  font-size: 1.125rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.hero__aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero__cover-link {
  display: block;
  max-width: min(100%, 17.5rem);
  margin-inline: auto;
  text-decoration: none;
  border-radius: 3px;
  overflow: hidden;
  box-shadow:
    0 24px 60px rgba(20, 18, 15, 0.14),
    0 4px 12px rgba(20, 18, 15, 0.08);
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
}

@media (min-width: 900px) {
  .hero__cover-link {
    margin-inline: 0;
    align-self: flex-end;
  }
}

.hero__cover-link:hover,
.hero__cover-link:focus-visible {
  transform: translateY(-2px);
  box-shadow:
    0 28px 70px rgba(20, 18, 15, 0.17),
    0 6px 16px rgba(20, 18, 15, 0.1);
}

.hero__cover-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.hero__cover {
  display: block;
  width: 100%;
  height: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 2px;
  border: 1px solid transparent;
  transition:
    background 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.btn--primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--ink);
}

.btn--block {
  width: 100%;
  margin-top: var(--space-md);
  box-sizing: border-box;
}

.card--dark .btn--primary {
  background: var(--on-dark);
  color: var(--dark);
  border-color: var(--on-dark);
}

.card--dark .btn--primary:hover,
.card--dark .btn--primary:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Cards */

.card {
  padding: var(--space-md);
  background: var(--bg-warm);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.card--edge {
  border-left: 3px solid var(--accent);
  background: #fff;
  box-shadow: 0 12px 40px rgba(20, 18, 15, 0.06);
}

.card--dark {
  background: var(--dark-elevated);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--on-dark);
}

.card__label {
  margin: 0 0 var(--space-sm);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.card__label--light {
  color: color-mix(in srgb, var(--on-dark) 70%, var(--accent));
}

.card__list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-muted);
  font-size: 0.9375rem;
}

.card__list li + li {
  margin-top: var(--space-sm);
}

.card__bullets {
  margin: 0 0 var(--space-sm);
  padding-left: 1.1rem;
  color: color-mix(in srgb, var(--on-dark) 88%, white);
  font-size: 0.9375rem;
}

.card__bullets li + li {
  margin-top: 0.4rem;
}

.small {
  font-size: 0.9375rem;
  margin: 0 0 var(--space-sm);
}

.small:last-child {
  margin-bottom: 0;
}

.muted {
  color: var(--ink-muted);
}

.card--dark .muted {
  color: color-mix(in srgb, var(--on-dark) 65%, transparent);
}

/* Sections */

.section {
  padding-block: var(--space-xl);
}

.section--tight {
  padding-block: var(--space-lg);
}

.section--dark {
  background: var(--dark);
  color: var(--on-dark);
  border-block: 1px solid rgba(255, 255, 255, 0.06);
}

.section--line {
  border-block: 1px solid var(--line);
  background: #fff;
}

.section--accent {
  background: linear-gradient(135deg, #2a2420 0%, #1a1614 100%);
  color: var(--on-dark);
  border-block: 1px solid rgba(255, 255, 255, 0.05);
}

.section__title {
  margin: 0 0 var(--space-md);
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section__title--light {
  color: #fff;
}

.section__title--on-accent {
  color: #fff;
}

.section__intro {
  margin: 0 0 var(--space-lg);
  max-width: 40rem;
  color: var(--ink-muted);
  font-size: 1.125rem;
}

.section--dark .section__intro {
  color: color-mix(in srgb, var(--on-dark) 78%, white);
}

.prose {
  max-width: 40rem;
}

.prose p {
  margin: 0 0 var(--space-md);
  color: var(--ink-muted);
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose--on-accent p {
  color: color-mix(in srgb, var(--on-dark) 82%, white);
}

.pullquote {
  margin: 0 0 var(--space-md);
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-style: italic;
  line-height: 1.45;
  color: var(--ink);
  border-left: 2px solid var(--accent);
  padding-left: var(--space-md);
}

.inline-quote {
  margin: var(--space-md) 0 0;
  padding: var(--space-md);
  background: var(--accent-soft);
  border-radius: 2px;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-style: italic;
  line-height: 1.5;
  color: var(--ink);
}

/* Principles */

.principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 720px) {
  .principles {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }
}

.principles li {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.principles__term {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  color: #fff;
}

.principles__detail {
  font-size: 0.9375rem;
  color: color-mix(in srgb, var(--on-dark) 72%, white);
  line-height: 1.55;
}

/* Split layout */

.split {
  display: grid;
  gap: var(--space-lg);
  align-items: start;
}

@media (min-width: 860px) {
  .split {
    grid-template-columns: 1fr 0.9fr;
    gap: var(--space-xl);
  }

  .split--reverse .split__main {
    order: 2;
  }

  .split--reverse .split__side {
    order: 1;
  }

  .split__main,
  .split__side {
    min-width: 0;
  }
}

/* Author photo */

.author__photo-frame {
  margin: 0 0 var(--space-lg);
  max-width: min(100%, 22rem);
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(0, 0, 0, 0.2);
  aspect-ratio: 1;
}

@media (min-width: 640px) {
  .author__photo-frame {
    max-width: min(100%, 26rem);
  }
}

.author__photo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* Ladder */

.ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  border-top: 1px solid var(--line);
}

.ladder li {
  display: grid;
  gap: var(--space-xs);
  padding-block: var(--space-md);
  border-bottom: 1px solid var(--line);
  position: relative;
  padding-left: 3rem;
  counter-increment: step;
}

.ladder li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: var(--space-md);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.ladder__step {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.ladder__desc {
  font-size: 0.9375rem;
  color: var(--ink-muted);
  max-width: 42rem;
}

/* Domains list */

.domains {
  list-style: none;
  margin: 0;
  padding: var(--space-md);
  border: 1px solid var(--line);
  background: var(--bg-warm);
  border-radius: 2px;
}

.domains li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.domains li:last-child {
  border-bottom: 0;
}

/* Footer */

.site-footer {
  padding-block: var(--space-lg);
  border-top: 1px solid var(--line);
  background: var(--bg-warm);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-footer__brand {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1rem;
}

.site-footer__note {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
  max-width: 36rem;
}

.footer__link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.footer__link:hover,
.footer__link:focus-visible {
  color: var(--ink);
}

.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;
}

/* Chat teaser */

.chat-teaser {
  max-width: 40rem;
  margin-top: var(--space-md);
}

.chat-teaser__preview {
  position: relative;
  padding: var(--space-md);
  background: var(--bg-warm);
  border: 1px solid var(--line);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.chat-teaser__bubble {
  padding: 0.65rem 1rem;
  border-radius: 6px;
  font-size: 0.9375rem;
  line-height: 1.5;
  max-width: 80%;
}

.chat-teaser__bubble--user {
  background: var(--ink);
  color: var(--bg);
  align-self: flex-end;
}

.chat-teaser__bubble--bot {
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink-muted);
  align-self: flex-start;
}

.chat-teaser__overlay {
  position: absolute;
  inset: 0;
  background: rgba(246, 244, 239, 0.6);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
}

.chat-teaser__badge {
  padding: 0.5rem 1.25rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 2px;
}

/* Notify form */

.notify-form {
  margin-top: var(--space-md);
}

.notify-form__row {
  display: flex;
  gap: var(--space-sm);
  max-width: 28rem;
}

.notify-form__input {
  flex: 1;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 2px;
  min-width: 0;
}

.notify-form__input:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.notify-form__note {
  margin: var(--space-xs) 0 0;
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

/* Giveaway */

.giveaway {
  max-width: 40rem;
}

.eyebrow--light {
  color: color-mix(in srgb, var(--on-dark) 70%, var(--accent));
}

.giveaway__lead {
  margin: 0 0 var(--space-md);
  color: color-mix(in srgb, var(--on-dark) 82%, white);
  font-size: 1.125rem;
}

.btn--giveaway {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-size: 1rem;
  padding: 0.85rem 2rem;
}

.btn--giveaway:hover,
.btn--giveaway:focus-visible {
  background: #a33535;
  border-color: #a33535;
}

/* Dark input variant for giveaway on dark bg */

.notify-form__input--dark {
  background: rgba(255, 255, 255, 0.92);
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--ink);
}

.notify-form__input--dark:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(140, 44, 44, 0.3);
}

.giveaway__fine {
  margin: var(--space-sm) 0 0;
  font-size: 0.8125rem;
  color: color-mix(in srgb, var(--on-dark) 55%, transparent);
}

/* Focus */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:focus-visible {
  outline-offset: 3px;
}

/* Hero editions note */

.hero__editions-note {
  margin: 1.1rem 0 0;
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  color: var(--ink-muted);
}

.hero__editions-note strong {
  color: var(--ink);
  font-weight: 600;
}

/* Editions section */

.editions {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.edition {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 2rem 2rem 2.25rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.edition:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -28px rgba(20, 18, 15, 0.35);
  border-color: rgba(20, 18, 15, 0.2);
}

.edition--flagship {
  background: linear-gradient(180deg, #fff 0%, #fbf8f2 100%);
  border-color: rgba(140, 44, 44, 0.35);
  padding: 2.5rem 2.5rem 2.75rem;
  box-shadow: 0 24px 60px -36px rgba(140, 44, 44, 0.4);
}

.edition--flagship:hover {
  border-color: var(--accent);
  box-shadow: 0 28px 70px -32px rgba(140, 44, 44, 0.5);
}

.edition__badge {
  position: absolute;
  top: -0.75rem;
  left: 2.25rem;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  box-shadow: 0 6px 18px -8px rgba(140, 44, 44, 0.6);
}

.edition__eyebrow {
  margin: 0 0 0.35rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.edition__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-serif);
  font-size: 1.85rem;
  line-height: 1.15;
  color: var(--ink);
}

.edition--flagship .edition__title {
  font-size: 2.35rem;
}

.edition__lead {
  margin: 0 0 1.1rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

.edition__points {
  list-style: none;
  padding: 0;
  margin: 0 0 1.75rem;
  display: grid;
  gap: 0.5rem;
}

.edition__points li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9375rem;
  color: var(--ink);
}

.edition__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
}

.edition__price {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0 0 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.edition__price-value {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  line-height: 1;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.edition--flagship .edition__price-value {
  color: var(--accent);
  font-size: 2.1rem;
}

.edition__price-note {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.editions__row {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .editions__row {
    grid-template-columns: 1fr 1fr;
  }
}

.editions__note {
  margin: var(--space-md) 0 0;
  text-align: center;
}