/* Thirdline Consulting — published identity, applied without invention. */

:root {
  /* Palette — these tokens only. No others. */
  --forest:        #16352A;
  --forest-deep:   #0E2218;
  --emerald:       #3F8158;
  --paper:         #F1ECE0;
  --paper-soft:    #E8E2D2;
  --ink:           #1B1813;
  --ink-soft:      #4A463E;
  --rule:          #2B2620;
  --rule-soft:     #B8B0A0;
  --paper-on-dark: #E9E2D2;
  --green-soft:    #9CB29C;
  --green-mid:     #2A4A3D;

  /* Layout */
  --content-max: 1240px;
  --gutter: clamp(28px, 6vw, 96px);
  --section-y: clamp(72px, 12vw, 160px);

  /* Type */
  --serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--emerald); color: var(--paper-on-dark); }

/* ------- Type primitives ------- */

.display, h1.display {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(44px, 6.5vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: pretty;
}

h2, .h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(34px, 4.4vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.018em;
  margin: 0;
  text-wrap: pretty;
}

h3, .h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(22px, 2vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
}

.lede {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.42;
  max-width: 32ch;
  letter-spacing: -0.005em;
  margin: 0;
  text-wrap: pretty;
}

.eyebrow, .meta {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  text-transform: none;
  margin: 0;
}

.eyebrow .num,
.eyebrow-num {
  color: var(--emerald);
}

p { margin: 0 0 1.1em; text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

em, i { font-style: italic; }

.italic-emerald { font-style: italic; color: var(--emerald); }

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms linear, border-color 120ms linear;
}
a:hover, a:focus-visible {
  color: var(--emerald);
  border-bottom-color: currentColor;
  outline: none;
}

.on-dark a:hover, .on-dark a:focus-visible {
  color: var(--emerald);
}

hr.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}
.on-dark hr.rule { border-top-color: var(--green-mid); }

/* ------- Layout ------- */

.wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

section { padding: var(--section-y) 0; }
section.tight { padding: clamp(48px, 7vw, 96px) 0; }

.on-paper      { background: var(--paper); color: var(--ink); }
.on-paper-soft { background: var(--paper-soft); color: var(--ink); }
.on-forest     { background: var(--forest); color: var(--paper-on-dark); }
.on-forest-deep{ background: var(--forest-deep); color: var(--paper-on-dark); }

.on-forest, .on-forest-deep { }
.on-forest .eyebrow, .on-forest-deep .eyebrow { color: var(--green-soft); }
.on-forest .ink-soft, .on-forest-deep .ink-soft { color: var(--green-soft); }

.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(40px, 5vw, 64px);
  border-bottom: 1px solid var(--rule);
  margin-bottom: clamp(40px, 5vw, 72px);
}
.on-forest .section-head, .on-forest-deep .section-head {
  border-bottom-color: var(--green-mid);
}
@media (min-width: 820px) {
  .section-head {
    grid-template-columns: 1fr 1.6fr;
    align-items: end;
  }
}

.section-head .eyebrow { align-self: start; }

/* ------- Nav ------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 48px);
  padding-top: 22px;
  padding-bottom: 22px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: none;
}
.nav-brand:hover { color: var(--ink); }
.nav-brand svg { display: block; }
.wordmark {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: -0.015em;
  line-height: 1;
  text-transform: lowercase;
}
.nav-links {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: clamp(18px, 2.4vw, 34px);
  list-style: none;
  padding: 0;
}
.nav-links a {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
}
.nav-links a[aria-current="page"] {
  color: var(--emerald);
}
.nav-cta {
  margin-left: clamp(8px, 1.5vw, 18px);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 1px;
}
.nav-cta:hover { border-bottom-color: var(--emerald); }

@media (min-width: 900px) {
  .nav-links { display: flex; }
}

.nav-menu-btn {
  margin-left: auto;
  background: transparent;
  border: 0;
  padding: 8px 0;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  cursor: pointer;
}
@media (min-width: 900px) {
  .nav-menu-btn { display: none; }
}

.nav-mobile {
  display: none;
  border-top: 1px solid var(--rule);
  padding: 16px var(--gutter) 24px;
  background: var(--paper);
}
.nav-mobile.open { display: block; }
.nav-mobile ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.nav-mobile a { font-size: 17px; }

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

.hero {
  padding-top: clamp(72px, 10vw, 140px);
  padding-bottom: clamp(80px, 12vw, 160px);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.7fr 1fr;
    gap: clamp(48px, 6vw, 96px);
  }
}
.hero .eyebrow { margin-bottom: clamp(28px, 4vw, 44px); }
.hero h1 { margin-bottom: clamp(24px, 3vw, 36px); }
.hero-aside {
  font-family: var(--serif);
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 30ch;
}
@media (min-width: 900px) {
  .hero-aside {
    border-left: 1px solid var(--rule);
    padding-left: clamp(24px, 3vw, 40px);
    align-self: end;
  }
}

/* ------- Practice / phase cards ------- */

.phase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.phase {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(40px, 5vw, 64px) 0;
  border-top: 1px solid var(--rule);
}
.phase:last-child { border-bottom: 1px solid var(--rule); }

@media (min-width: 820px) {
  .phase {
    grid-template-columns: 0.5fr 1.2fr 1fr;
    align-items: start;
  }
}

.phase-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(36px, 4vw, 52px);
  line-height: 1;
  color: var(--emerald);
}
.phase-name {
  font-family: var(--serif);
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
}
.phase-when {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin-bottom: 18px;
}
.phase-body { font-size: 16px; line-height: 1.6; }
.phase-deliv {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-soft);
}
.phase-deliv .label {
  display: block;
  letter-spacing: 0.14em;
  margin-bottom: 8px;
  color: var(--ink);
}
.phase-deliv .item {
  display: block;
  padding: 6px 0;
  border-top: 1px solid var(--rule-soft);
}
.phase-deliv .item:first-of-type { border-top: 0; padding-top: 0; }

/* ------- Third line ------- */

.lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--green-mid);
}
.line-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: clamp(16px, 3vw, 40px);
  padding: clamp(20px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--green-mid);
  align-items: baseline;
}
@media (min-width: 700px) {
  .line-row { grid-template-columns: 120px 1fr 1.2fr; }
}
.line-roman {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(28px, 3vw, 40px);
  color: var(--green-soft);
}
.line-name {
  font-family: var(--serif);
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.2;
}
.line-note {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--green-soft);
  line-height: 1.5;
}
.line-row.highlight .line-roman,
.line-row.highlight .line-name { color: var(--emerald); }
.line-row.highlight .line-name { font-style: italic; }

.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
}
@media (min-width: 820px) {
  .two-col { grid-template-columns: 1fr 1fr; }
}
.col-head {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--green-soft);
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--green-mid);
}
.on-paper .col-head { color: var(--ink-soft); border-bottom-color: var(--rule); }
.col-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--serif);
  font-size: clamp(19px, 1.6vw, 22px);
  line-height: 1.35;
}
.col-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--green-mid);
}
.on-paper .col-list li { border-bottom-color: var(--rule); }

/* ------- Domains grid ------- */

.domain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}
@media (min-width: 820px) { .domain-grid { grid-template-columns: repeat(3, 1fr); } }

.domain-cell {
  padding: clamp(28px, 3.5vw, 44px);
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 220px;
  background: var(--paper);
  transition: background 160ms linear;
}
.domain-cell:hover { background: var(--paper-soft); }
.domain-abbr {
  font-family: var(--serif);
  font-size: clamp(48px, 6vw, 80px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.domain-name {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  margin-top: auto;
}
.domain-code {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--emerald);
}

/* ------- Regulatory ------- */

.reg-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--green-mid);
}
@media (min-width: 700px) { .reg-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .reg-grid { grid-template-columns: repeat(4, 1fr); } }

.reg-cell {
  padding: clamp(28px, 3.5vw, 44px) clamp(20px, 2.5vw, 32px);
  border-bottom: 1px solid var(--green-mid);
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 200px;
}
@media (min-width: 700px) {
  .reg-cell:nth-child(odd) { border-right: 1px solid var(--green-mid); }
}
@media (min-width: 1000px) {
  .reg-cell { border-right: 1px solid var(--green-mid); }
  .reg-cell:nth-child(odd) { border-right: 1px solid var(--green-mid); }
  .reg-cell:last-child { border-right: 0; }
}
.reg-abbr {
  font-family: var(--serif);
  font-size: clamp(34px, 3.6vw, 48px);
  line-height: 1;
  letter-spacing: -0.018em;
}
.reg-name {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--paper-on-dark);
  line-height: 1.4;
  margin-top: auto;
}
.reg-status {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--green-soft);
}

/* ------- Perspectives list ------- */

.notes-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.notes-list li { border-bottom: 1px solid var(--rule); }
.notes-list a,
.notes-list .note-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(22px, 3vw, 32px) 0;
  border-bottom: 0;
  transition: background 160ms linear, padding 160ms linear;
}
.notes-list a:hover {
  background: var(--paper-soft);
  padding-left: 16px;
  padding-right: 16px;
  color: var(--ink);
}
.on-forest .notes-list { border-top-color: var(--green-mid); }
.on-forest .notes-list li { border-bottom-color: var(--green-mid); }
.on-forest .notes-list a:hover { background: rgba(255,255,255,0.02); color: var(--paper-on-dark); }

@media (min-width: 820px) {
  .notes-list a,
  .notes-list .note-row {
    grid-template-columns: 120px 1fr 120px;
    align-items: baseline;
    gap: clamp(20px, 3vw, 48px);
  }
}
.note-date {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}
.on-forest .note-date { color: var(--green-soft); }
.note-title {
  font-family: var(--serif);
  font-size: clamp(19px, 1.6vw, 22px);
  line-height: 1.35;
  letter-spacing: -0.005em;
  max-width: 60ch;
}
.note-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--emerald);
  text-align: left;
}
@media (min-width: 820px) { .note-num { text-align: right; } }

/* ------- Engage block ------- */

.engage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(40px, 6vw, 96px);
}
@media (min-width: 820px) {
  .engage-grid { grid-template-columns: 1.4fr 1fr; }
}
.engage-mail {
  font-family: var(--serif);
  font-size: clamp(28px, 3.5vw, 44px);
  letter-spacing: -0.018em;
  line-height: 1.1;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 4px;
  display: inline-block;
}
.on-forest .engage-mail { border-bottom-color: var(--green-mid); }
.engage-mail:hover {
  color: var(--emerald);
  border-bottom-color: var(--emerald);
}

.engage-side {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.engage-side .row { display: flex; flex-direction: column; gap: 6px; }

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

footer.site {
  background: var(--forest-deep);
  color: var(--paper-on-dark);
  padding: clamp(56px, 8vw, 96px) 0 clamp(32px, 4vw, 48px);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(40px, 5vw, 64px);
  border-bottom: 1px solid var(--green-mid);
}
@media (min-width: 820px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}
.footer-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  font-weight: 400;
  color: var(--green-soft);
  margin: 0 0 16px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.footer-col a { color: var(--paper-on-dark); }
.footer-brand .wordmark { font-size: 26px; }
.footer-brand p { color: var(--green-soft); font-size: 14px; line-height: 1.6; max-width: 38ch; margin-top: 16px; }

.footer-legal {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 18px;
  padding-top: clamp(28px, 3vw, 40px);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--green-soft);
}

/* ------- Note (long-read) ------- */

article.note {
  max-width: 68ch;
  margin: 0 auto;
}
article.note .note-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin-bottom: 28px;
  display: flex;
  gap: 24px;
}
article.note .note-meta .num { color: var(--emerald); }
article.note h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.018em;
  margin: 0 0 36px;
}
article.note .standfirst {
  font-family: var(--serif);
  font-size: clamp(20px, 2vw, 24px);
  line-height: 1.45;
  color: var(--ink-soft);
  margin: 0 0 48px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--rule);
}
article.note p {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  margin-bottom: 1.2em;
}
article.note h2 {
  font-family: var(--serif);
  font-size: clamp(24px, 2.4vw, 30px);
  line-height: 1.15;
  margin: 56px 0 20px;
}

/* ------- Utility ------- */

.cluster { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: baseline; }
.stack-sm { display: flex; flex-direction: column; gap: 8px; }
.muted { color: var(--ink-soft); }
.on-forest .muted, .on-forest-deep .muted { color: var(--green-soft); }
.pull-end { margin-left: auto; }
.numlist {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: nl;
}
.numlist li {
  counter-increment: nl;
  padding: 14px 0 14px 56px;
  border-top: 1px solid var(--rule);
  position: relative;
  font-family: var(--serif);
  font-size: 19px;
}
.numlist li::before {
  content: counter(nl, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--emerald);
}