/* CHIB LTD — stone, ink, cobalt */

:root {
  --bg: #E8EAED;
  --bg-deep: #DDE1E6;
  --ink: #141820;
  --ink-soft: #3A404C;
  --ink-faint: #6B7280;
  --cobalt: #3B5BDB;
  --cobalt-deep: #2A45B0;
  --cobalt-wash: rgba(59, 91, 219, 0.08);
  --paper: #F2F3F5;
  --line: rgba(20, 24, 32, 0.12);
  --line-strong: rgba(20, 24, 32, 0.22);
  --serif: "Libre Baskerville", Georgia, "Times New Roman", serif;
  --sans: "DM Sans", "Segoe UI", sans-serif;
  --nav-h: 3.25rem;
  --measure: 42rem;
  --measure-wide: 56rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1.5rem);
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 120% 80% at 10% -10%, rgba(59, 91, 219, 0.07), transparent 50%),
    radial-gradient(ellipse 90% 60% at 100% 20%, rgba(20, 24, 32, 0.04), transparent 45%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 48%, var(--bg) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px 180px;
}

a {
  color: var(--cobalt);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--cobalt-deep);
}

img {
  max-width: 100%;
}

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

/* —— Chapter pill navigation —— */

.chapter-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(232, 234, 237, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.chapter-nav__track {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding: 0.65rem 1.25rem;
  scrollbar-width: none;
  -ms-overflow-style: none;
  max-width: 72rem;
  margin: 0 auto;
}

.chapter-nav__track::-webkit-scrollbar {
  display: none;
}

.chapter-pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.chapter-pill__label {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--ink);
}

.chapter-pill__title {
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.65rem;
  color: var(--ink-faint);
}

.chapter-pill:hover {
  border-color: var(--line-strong);
  background: var(--paper);
  color: var(--ink);
}

.chapter-pill.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

.chapter-pill.is-active .chapter-pill__label,
.chapter-pill.is-active .chapter-pill__title {
  color: var(--bg);
}

/* —— Full-bleed stacked hero —— */

.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 4rem 1.5rem 5rem;
  max-width: 72rem;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}

.hero__brand {
  margin: 0 0 1.75rem;
  font-family: var(--serif);
  font-size: clamp(3.5rem, 14vw, 9.5rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero__headline {
  margin: 0 0 1.25rem;
  max-width: 22ch;
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.8vw, 2rem);
  font-weight: 400;
  line-height: 1.35;
  color: var(--ink);
}

.hero__lede {
  margin: 0 0 2.25rem;
  max-width: 36rem;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 0.9rem 1.5rem;
  background: var(--cobalt);
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid var(--cobalt);
  transition: background 0.2s ease, transform 0.2s ease;
}

.hero__cta:hover {
  background: var(--cobalt-deep);
  color: #fff;
  transform: translateY(-1px);
}

/* —— Chapter essays —— */

.chapter {
  padding: 5.5rem 1.5rem 4rem;
  max-width: calc(var(--measure) + 3rem);
  margin: 0 auto;
}

.chapter--wide {
  max-width: calc(var(--measure-wide) + 3rem);
}

.chapter--letters {
  max-width: calc(var(--measure) + 3rem);
}

.chapter__meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chapter__num {
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cobalt);
}

.chapter__divider {
  flex: 0 0 2rem;
  height: 1px;
  background: var(--line-strong);
}

.chapter__title {
  margin: 0 0 1.5rem;
  font-family: var(--serif);
  font-size: clamp(1.85rem, 4vw, 2.65rem);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.chapter__intro {
  margin: 0 0 2.5rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.chapter__body p {
  margin: 0 0 1.25rem;
}

.essay-subhead {
  margin: 2.25rem 0 0.85rem;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 700;
}

.essay-list {
  margin: 1.25rem 0 1.75rem;
  padding: 0 0 0 1.15rem;
}

.essay-list li {
  margin-bottom: 0.55rem;
  padding-left: 0.35rem;
}

.essay-list li::marker {
  color: var(--cobalt);
}

/* —— Pull quotes —— */

.pull-quote {
  margin: 0;
  padding: 4rem 1.5rem;
  max-width: 40rem;
  margin-inline: auto;
  text-align: center;
  border-block: 1px solid var(--line);
  background: linear-gradient(90deg, transparent, var(--cobalt-wash), transparent);
}

.pull-quote p {
  margin: 0 0 1.25rem;
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  font-style: italic;
  font-weight: 400;
  line-height: 1.45;
  color: var(--ink);
}

.pull-quote footer {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-style: normal;
}

.pull-quote--alt {
  background: linear-gradient(180deg, transparent, rgba(20, 24, 32, 0.03), transparent);
}

/* —— Vertical spine timeline —— */

.spine {
  position: relative;
  margin: 2rem 0 3.5rem;
  padding-left: 0;
}

.spine__line {
  position: absolute;
  left: 1.15rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cobalt), var(--line-strong) 30%, var(--line));
}

.spine__node {
  position: relative;
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1.25rem;
  padding-bottom: 2.75rem;
}

.spine__node:last-child {
  padding-bottom: 0;
}

.spine__marker {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.spine__dot {
  width: 0.85rem;
  height: 0.85rem;
  margin-top: 0.35rem;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cobalt);
  box-shadow: 0 0 0 4px var(--bg);
  z-index: 1;
}

.spine__year {
  font-family: var(--serif);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--cobalt);
  letter-spacing: 0.06em;
}

.spine__content h3 {
  margin: 0 0 0.55rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 700;
}

.spine__content p {
  margin: 0 0 0.65rem;
  color: var(--ink-soft);
}

.spine__note {
  font-size: 0.88rem;
  color: var(--ink-faint);
  font-style: italic;
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2rem 0 0;
  border-top: 1px solid var(--line);
  margin-top: 1rem;
}

.stat__num {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
}

.stat__num::after {
  content: "+";
  color: var(--cobalt);
  font-size: 0.7em;
  margin-left: 0.05em;
}

.stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

/* —— Letters from the practice —— */

.letter {
  padding: 2.5rem 0;
  border-top: 1px solid var(--line);
}

.letter:last-child {
  border-bottom: 1px solid var(--line);
}

.letter__head time {
  display: block;
  margin-bottom: 0.65rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.letter__head h3 {
  margin: 0 0 1.25rem;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  font-weight: 700;
  line-height: 1.3;
}

.letter__body p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
}

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

/* —— Definition list principles —— */

.principles {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.principles__item {
  display: grid;
  grid-template-columns: minmax(8rem, 12rem) 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.principles__item dt {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

.principles__item dd {
  margin: 0;
  color: var(--ink-soft);
}

/* —— Formal letter contact —— */

.chapter--letter-form {
  max-width: calc(var(--measure-wide) + 3rem);
  padding-bottom: 5rem;
}

.formal-letter {
  background: var(--paper);
  border: 1px solid var(--line-strong);
  padding: clamp(1.75rem, 4vw, 3rem);
  box-shadow: 0 12px 40px rgba(20, 24, 32, 0.06);
  background-image:
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent 30%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 27px,
      rgba(20, 24, 32, 0.03) 28px
    );
}

.formal-letter__masthead {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.formal-letter__from {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.formal-letter__to {
  margin: 0;
  text-align: right;
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.55;
}

.formal-letter__salutation {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: 0 0 1.5rem;
}

.formal-letter__line {
  margin: 0 0 1.15rem;
  line-height: 2.1;
  color: var(--ink-soft);
}

.formal-letter__line--block {
  margin-bottom: 0.65rem;
}

.inline-field {
  display: inline-block;
  width: 11rem;
  margin: 0 0.2rem;
  padding: 0.15rem 0.35rem;
  border: none;
  border-bottom: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.55);
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  vertical-align: baseline;
}

.inline-field--wide {
  width: min(18rem, 100%);
}

.inline-field:focus {
  outline: none;
  border-bottom-color: var(--cobalt);
  background: #fff;
}

.letter-textarea {
  display: block;
  width: 100%;
  margin: 0 0 1.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  resize: vertical;
  min-height: 10rem;
}

.letter-textarea:focus {
  outline: 2px solid var(--cobalt-wash);
  border-color: var(--cobalt);
}

.formal-letter__closing {
  margin: 1.75rem 0 0.35rem;
  font-family: var(--serif);
}

.formal-letter__signature {
  margin: 0 0 2rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}

.formal-letter__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.submit-btn {
  appearance: none;
  cursor: pointer;
  padding: 0.9rem 1.6rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: background 0.2s ease, color 0.2s ease;
}

.submit-btn:hover {
  background: var(--cobalt);
  border-color: var(--cobalt);
  color: #fff;
}

.form-status {
  margin: 0;
  font-size: 0.9rem;
  color: var(--cobalt-deep);
}

.form-status.is-error {
  color: #8B2E2E;
}

/* —— Footer —— */

.site-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--ink);
  color: #C5CAD3;
  padding: 3.5rem 1.5rem;
}

.site-footer__inner {
  max-width: 42rem;
  margin: 0 auto;
  text-align: center;
}

.site-footer__brand {
  margin: 0 0 0.75rem;
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: #F2F3F5;
}

.site-footer__address,
.site-footer__email {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.site-footer a {
  color: #A8B8F0;
}

.site-footer a:hover {
  color: #fff;
}

.site-footer__copy {
  margin: 1.75rem 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: #7A8290;
}

/* —— Reveal motion —— */

[data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.hero[data-reveal] {
  transition-delay: 0.05s;
}

/* —— Responsive —— */

@media (max-width: 720px) {
  .hero {
    min-height: auto;
    padding-top: 3rem;
    padding-bottom: 3.5rem;
  }

  .chapter {
    padding-top: 4rem;
  }

  .spine__node {
    grid-template-columns: 2.5rem 1fr;
    gap: 0.85rem;
  }

  .spine__line {
    left: 0.7rem;
  }

  .stat-strip {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .principles__item {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .formal-letter__to {
    text-align: left;
  }

  .inline-field,
  .inline-field--wide {
    width: 100%;
    display: block;
    margin: 0.35rem 0;
  }

  .chapter-pill__title {
    display: none;
  }
}

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

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__cta,
  .chapter-pill,
  .submit-btn {
    transition: none;
  }
}