/* ----------------------------------------------------------------------------
   Ambio — shared stylesheet
   Aesthetic: literary frontispiece. Restraint, precision, oldstyle figures,
   wide measure, hairline rules, generous margins.
---------------------------------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Open+Sans:wght@400;500;600&display=swap');

:root {
  /* Brand tokens — derived from lib/main.dart in the Flutter app */
  --c-paper:        #f9f8f5;
  --c-paper-deep:   #f3f0e7;
  --c-ink:          #2c2c2c;
  --c-ink-soft:     #4a4541;
  --c-ink-faint:    #8a8278;
  --c-amber:        #d4a574;
  --c-amber-deep:   #b8854d;
  --c-rule:         rgba(44, 44, 44, 0.12);

  /* Typography */
  --f-display:  'EB Garamond', 'Hoefler Text', Georgia, serif;
  --f-body:     'EB Garamond', 'Hoefler Text', Georgia, serif;
  --f-ui:       'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Measure & rhythm */
  --measure:    62ch;
  --gutter:     clamp(1.25rem, 4vw, 2.5rem);
  --rhythm:     1.6rem;
}

/* ---------- reset ------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

input,
textarea {
  font: inherit;
  color: inherit;
}

/* ---------- paper ground ------------------------------------------------ */

body {
  font-family: var(--f-body);
  font-size: clamp(1.05rem, 0.95rem + 0.4vw, 1.18rem);
  line-height: 1.65;
  color: var(--c-ink);
  background-color: var(--c-paper);
  font-feature-settings: 'onum', 'liga', 'kern';
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Subtle paper grain — applied as a fixed overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
}

main,
.site-header,
.site-footer {
  position: relative;
  z-index: 2;
}

/* ---------- typographic primitives ------------------------------------- */

h1,
h2,
h3,
h4 {
  font-family: var(--f-display);
  font-weight: 500;
  line-height: 1.15;
  color: var(--c-ink);
  letter-spacing: -0.005em;
}

h1 {
  font-size: clamp(2.4rem, 1.6rem + 4vw, 4.8rem);
  font-weight: 500;
}

h2 {
  font-size: clamp(1.7rem, 1.2rem + 2vw, 2.6rem);
  margin-top: calc(var(--rhythm) * 1.5);
  margin-bottom: var(--rhythm);
}

h3 {
  font-size: clamp(1.25rem, 1rem + 0.8vw, 1.55rem);
  margin-top: var(--rhythm);
  margin-bottom: 0.6rem;
}

p {
  margin-bottom: var(--rhythm);
  max-width: var(--measure);
}

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

em {
  font-style: italic;
  color: var(--c-ink-soft);
}

strong {
  font-weight: 600;
  color: var(--c-ink);
}

a.link {
  color: var(--c-amber-deep);
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: color 200ms ease, border-color 200ms ease;
}

a.link:hover {
  color: var(--c-ink);
  border-bottom-color: var(--c-ink);
}

/* Drop cap — first letter of a paragraph treated as initial capital */
.drop-cap::first-letter {
  font-family: var(--f-display);
  float: left;
  font-size: 4.6em;
  line-height: 0.85;
  padding: 0.08em 0.12em 0 0;
  margin-top: 0.05em;
  font-weight: 500;
  color: var(--c-amber-deep);
  font-feature-settings: 'lnum';
}

/* ---------- layout ----------------------------------------------------- */

.container {
  width: 100%;
  max-width: 64rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--narrow {
  max-width: 42rem;
}

main {
  flex: 1;
  padding-block: clamp(2rem, 4vw, 4rem);
}

/* ---------- header ----------------------------------------------------- */

.site-header {
  padding: clamp(1.5rem, 3vw, 2.5rem) 0 0;
}

.site-header__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
}

.wordmark {
  font-family: var(--f-display);
  font-size: 1.65rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--c-ink);
  font-feature-settings: 'lnum';
}

/* Solo wordmark — used on the brand root.
   Renders just "Ambio" with a decorative trailing amber dot. */
a.wordmark::after {
  content: '·';
  color: var(--c-amber-deep);
  margin-left: 0.35em;
}

/* Multi-part wordmark — used inside product subsections (e.g. /reader/).
   Renders "Ambio · Reader" with each half independently linkable. */
div.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
}

div.wordmark a {
  color: inherit;
  text-decoration: none;
  transition: color 220ms ease;
}

div.wordmark a:hover {
  color: var(--c-amber-deep);
}

div.wordmark .wordmark__sep {
  color: var(--c-amber-deep);
  font-weight: 400;
}

.site-nav {
  display: flex;
  gap: clamp(1rem, 2.5vw, 2rem);
  font-family: var(--f-ui);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-ink-faint);
}

.site-nav a {
  transition: color 200ms ease;
}

.site-nav a:hover {
  color: var(--c-ink);
}

/* ---------- hero (landing) --------------------------------------------- */

.hero {
  padding-block: clamp(3rem, 9vw, 7rem) clamp(2rem, 5vw, 4rem);
}

.hero__eyebrow {
  font-family: var(--f-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--c-amber-deep);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(2.8rem, 1.4rem + 6vw, 6rem);
  line-height: 1.02;
  font-weight: 500;
  margin-bottom: 1.5rem;
  max-width: 18ch;
  letter-spacing: -0.015em;
}

.hero__title em {
  font-style: italic;
  color: var(--c-amber-deep);
}

.hero__lede {
  font-size: clamp(1.15rem, 1rem + 0.5vw, 1.35rem);
  color: var(--c-ink-soft);
  max-width: 38ch;
  line-height: 1.5;
  margin-bottom: 2.5rem;
}

/* ---------- ornament --------------------------------------------------- */

.ornament {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-block: clamp(2.5rem, 5vw, 4rem);
  color: var(--c-amber-deep);
}

.ornament::before,
.ornament::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--c-rule);
}

.ornament__mark {
  font-family: var(--f-display);
  font-size: 1.4rem;
  line-height: 1;
  opacity: 0.85;
}

/* ---------- features list (roman numerals) ----------------------------- */

.features {
  list-style: none;
  counter-reset: feature;
  display: grid;
  gap: clamp(1.75rem, 3vw, 2.5rem);
  margin-block: clamp(2rem, 4vw, 3rem);
}

.feature {
  counter-increment: feature;
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  align-items: baseline;
  gap: 1rem;
}

.feature::before {
  content: counter(feature, upper-roman) '.';
  font-family: var(--f-display);
  font-size: 1.4rem;
  font-style: italic;
  color: var(--c-amber-deep);
  text-align: right;
  letter-spacing: 0.02em;
}

.feature h3 {
  font-size: 1.35rem;
  font-weight: 500;
  margin: 0 0 0.35rem;
  color: var(--c-ink);
}

.feature p {
  font-size: 1.02rem;
  line-height: 1.55;
  color: var(--c-ink-soft);
  margin: 0;
  max-width: 52ch;
}

/* ---------- buttons ---------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--f-ui);
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 500;
  padding: 1rem 1.75rem;
  background-color: var(--c-ink);
  color: var(--c-paper);
  border: 1px solid var(--c-ink);
  border-radius: 1px;
  transition: background-color 220ms ease, color 220ms ease, transform 220ms ease;
}

.btn:hover {
  background-color: var(--c-amber-deep);
  border-color: var(--c-amber-deep);
  transform: translateY(-1px);
}

.btn::after {
  content: '→';
  font-family: var(--f-display);
  font-size: 1rem;
  letter-spacing: 0;
  transition: transform 220ms ease;
}

.btn:hover::after {
  transform: translateX(3px);
}

.btn:disabled,
.btn[aria-disabled='true'] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn:disabled:hover,
.btn[aria-disabled='true']:hover {
  background-color: var(--c-ink);
  border-color: var(--c-ink);
  transform: none;
}

.btn:disabled:hover::after,
.btn[aria-disabled='true']:hover::after {
  transform: none;
}

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

.btn--ghost:hover {
  background-color: var(--c-ink);
  color: var(--c-paper);
}

/* ---------- card (auth pages) ------------------------------------------ */

.card {
  max-width: 32rem;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem);
  background-color: var(--c-paper);
  border: 1px solid var(--c-rule);
  text-align: center;
}

.card__mark {
  font-family: var(--f-display);
  font-size: 3rem;
  color: var(--c-amber-deep);
  line-height: 1;
  margin-bottom: 1.5rem;
}

.card h1 {
  font-size: clamp(1.8rem, 1.4rem + 1.5vw, 2.4rem);
  margin-bottom: 1rem;
}

.card p {
  margin-left: auto;
  margin-right: auto;
  color: var(--c-ink-soft);
  font-size: 1.05rem;
}

.card .btn {
  margin-top: 2rem;
}

/* ---------- forms ------------------------------------------------------ */

.form {
  display: grid;
  gap: 1.5rem;
  text-align: left;
  margin-top: 2rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field label {
  font-family: var(--f-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--c-ink-faint);
}

.field input {
  font-family: var(--f-body);
  font-size: 1.1rem;
  padding: 0.85rem 1rem;
  background-color: var(--c-paper);
  border: 1px solid var(--c-rule);
  border-radius: 1px;
  color: var(--c-ink);
  transition: border-color 200ms ease;
}

.field input:focus {
  outline: none;
  border-color: var(--c-amber-deep);
}

.field input::placeholder {
  color: var(--c-ink-faint);
}

.form .btn {
  justify-self: stretch;
  justify-content: center;
  margin-top: 0.5rem;
}

.form-error {
  font-family: var(--f-ui);
  font-size: 0.85rem;
  color: #a23a2e;
  padding: 0.75rem 1rem;
  background-color: rgba(162, 58, 46, 0.06);
  border-left: 2px solid #a23a2e;
  display: none;
}

.form-error.is-visible {
  display: block;
}

/* ---------- prose (privacy / terms) ------------------------------------ */

.prose {
  max-width: var(--measure);
  margin: 0 auto;
}

.prose h1 {
  font-size: clamp(2.2rem, 1.6rem + 2.5vw, 3.4rem);
  margin-bottom: 0.5rem;
}

.prose .updated {
  font-family: var(--f-ui);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-ink-faint);
  margin-bottom: 2.5rem;
}

.prose p,
.prose li {
  color: var(--c-ink-soft);
}

.prose ul,
.prose ol {
  margin: 0 0 var(--rhythm) 1.5rem;
  padding: 0;
  max-width: var(--measure);
}

.prose li {
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

.prose ul li::marker {
  color: var(--c-amber-deep);
}

/* ---------- footer ----------------------------------------------------- */

.site-footer {
  margin-top: clamp(4rem, 8vw, 7rem);
  padding-block: 2.5rem 3rem;
  border-top: 1px solid var(--c-rule);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  justify-content: space-between;
  align-items: baseline;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 2.5vw, 2rem);
  font-family: var(--f-ui);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-ink-faint);
}

.site-footer nav a {
  transition: color 200ms ease;
}

.site-footer nav a:hover {
  color: var(--c-ink);
}

.colophon {
  font-family: var(--f-display);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--c-ink-faint);
  text-align: right;
  max-width: 28ch;
}

/* ---------- entrance reveal -------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(8px);
    animation: reveal 900ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
  }

  .reveal-1 { animation-delay: 80ms; }
  .reveal-2 { animation-delay: 200ms; }
  .reveal-3 { animation-delay: 340ms; }
  .reveal-4 { animation-delay: 480ms; }
  .reveal-5 { animation-delay: 620ms; }

  @keyframes reveal {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* ---------- brand splash (top-level /) --------------------------------- */

.brand-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: clamp(3rem, 8vw, 6rem);
}

.brand-hero {
  text-align: center;
  padding-block: clamp(1rem, 3vw, 2rem) clamp(2rem, 5vw, 3rem);
}

.brand-hero__eyebrow {
  font-family: var(--f-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  color: var(--c-amber-deep);
  margin-bottom: 1.5rem;
}

.brand-hero__title {
  font-family: var(--f-display);
  font-size: clamp(4rem, 2rem + 12vw, 9rem);
  line-height: 0.92;
  font-weight: 500;
  color: var(--c-ink);
  letter-spacing: -0.02em;
  margin-bottom: 1.75rem;
  font-feature-settings: 'lnum';
}

.brand-hero__lede {
  font-family: var(--f-display);
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.4rem);
  line-height: 1.5;
  color: var(--c-ink-soft);
  max-width: none;
  margin: 0 auto;
}

.brand-hero__lede em {
  font-style: italic;
  color: var(--c-amber-deep);
}

.brand-products {
  padding-block: clamp(1rem, 3vw, 2rem);
}

.brand-products__label {
  font-family: var(--f-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--c-ink-faint);
  text-align: center;
  margin-bottom: 1.5rem;
}

.product-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--c-rule);
  background-color: var(--c-paper);
  transition: border-color 280ms ease, transform 280ms ease, background-color 280ms ease;
}

.product-card:hover {
  border-color: var(--c-amber-deep);
  background-color: var(--c-paper-deep);
  transform: translateY(-2px);
}

.product-card__inner {
  padding: clamp(1.75rem, 4vw, 2.75rem);
}

.product-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.product-card__title {
  font-family: var(--f-display);
  font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.2rem);
  font-weight: 500;
  margin: 0;
  color: var(--c-ink);
  letter-spacing: -0.005em;
}

.product-card__title em {
  font-style: italic;
  color: var(--c-amber-deep);
}

.product-card__arrow {
  font-family: var(--f-display);
  font-size: 1.6rem;
  color: var(--c-amber-deep);
  transition: transform 280ms ease;
  flex-shrink: 0;
}

.product-card:hover .product-card__arrow {
  transform: translateX(4px);
}

.product-card__desc {
  font-family: var(--f-body);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--c-ink-soft);
  margin: 0 0 1rem;
  max-width: none;
}

.product-card__meta {
  font-family: var(--f-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--c-ink-faint);
  margin: 0;
}

.brand-products__teaser {
  font-family: var(--f-display);
  font-style: italic;
  text-align: center;
  color: var(--c-ink-faint);
  font-size: 1rem;
  margin-top: 2rem;
  max-width: none;
}

/* ---------- brand-only footer ------------------------------------------ */

.brand-footer {
  padding-block: 2rem 3rem;
  border-top: 1px solid var(--c-rule);
  position: relative;
  z-index: 2;
}

.brand-footer__inner {
  text-align: center;
}

.brand-footer .colophon {
  text-align: center;
  max-width: none;
  margin: 0 auto;
}

/* ---------- small viewport adjustments --------------------------------- */

@media (max-width: 540px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .colophon {
    text-align: left;
    max-width: none;
  }

  .feature {
    grid-template-columns: 2.5rem 1fr;
  }
}