/* The Fuzzy Middle — site styles
   Tokens and measurements taken from the Claude Design prototype
   (project/The Fuzzy Middle - Site.dc.html). */

/* ---------------------------------------------------------------- tokens */

:root {
  color-scheme: light;
  --paper: #F4F0E7;
  --card: #FBF9F3;
  --ink: #17191C;
  --graphite: #6F777D;
  --redline: #E24A3B;
  --grid: #E1DCCE;
  --grid-strong: #CAC5B6;
  --body: #33373B;

  /* revision spine */
  --blur-amount: 4.5px;
  --dim-opacity: 0.55;
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #17191C;
  --card: #1E2124;
  --ink: #F4F0E7;
  --graphite: #8B9298;
  --redline: #E24A3B;
  --grid: #212429;
  --grid-strong: #33383D;
  --body: #C3C9CC;
}

/* ------------------------------------------------------------------ base */

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
}

.ground {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: -1px -1px;
  color: var(--ink);
  font-family: 'IBM Plex Sans', Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.62;
  font-weight: 400;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--redline);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover { color: var(--ink); }

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

em { font-style: italic; }

/* ------------------------------------------------------------- utilities */

.wrap {
  width: 100%;
  max-width: 74rem;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 4rem);
}

/* Engineering-notebook label: mono, letterspaced, uppercase */
.label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
}

.fig {
  display: block;
  color: var(--redline);
  margin-bottom: 2.4rem;
}

.rule {
  height: 1px;
  background: var(--ink);
  opacity: 0.16;
}

/* the hairline that fills the rest of a label row */
.rule-inline {
  flex: 1;
  height: 1px;
  background: var(--graphite);
  opacity: 0.35;
}

.mark {
  display: block;
  flex: none;
}

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

@keyframes fmRise {
  to { opacity: 1; transform: none; }
}

.rise {
  opacity: 0;
  transform: translateY(14px);
  animation: fmRise 0.8s cubic-bezier(0.22, 0.7, 0.3, 1) forwards;
}

.rise-1 { animation-delay: 0.06s; }
.rise-2 { animation-delay: 0.16s; }

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

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1.5rem 0 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: inherit;
}

.brand:hover { color: inherit; }

.brand .mark { width: 30px; color: var(--redline); }

.brand-name { color: var(--ink); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.nav-link {
  background: none;
  border: none;
  border-bottom: 1px solid transparent;
  padding: 0.35rem 0;
  cursor: pointer;
  color: var(--graphite);
  text-decoration: none;
}

.nav-link:hover { color: var(--ink); }

.nav-link[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--redline);
}

.theme-toggle {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  background: none;
  cursor: pointer;
  color: var(--graphite);
  border: 1px solid var(--grid-strong);
  padding: 0.45rem 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle:hover { color: var(--ink); }

.theme-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  display: block;
}

/* ------------------------------------------------------------------ hero */

.hero {
  padding: clamp(3.5rem, 11vh, 7rem) 0 clamp(3rem, 8vh, 5rem);
}

.hero .fig { margin-bottom: 1.4rem; }

.hero h1 {
  font-family: Archivo, 'Arial Narrow', sans-serif;
  font-weight: 800;
  font-size: clamp(2.7rem, 1.2rem + 7.4vw, 7rem);
  line-height: 0.94;
  letter-spacing: -0.035em;
  max-width: 15ch;
  margin: 0;
}

.hero h1 .second-line {
  font-weight: 400;
  color: var(--graphite);
  display: block;
}

.hero-lede {
  margin: 2rem 0 0;
  max-width: 46ch;
  font-size: 1.16em;
  color: var(--body);
}

.hero-lede em { color: var(--ink); }

/* -------------------------------------------------------- revision spine */

.spine-section {
  padding: clamp(2rem, 6vh, 3.5rem) 0 clamp(4rem, 10vh, 7rem);
}

.spine-heading {
  color: var(--graphite);
  display: flex;
  gap: 0.9rem;
  align-items: center;
  margin-bottom: 2.2rem;
}

.spine {
  display: flex;
  align-items: stretch;
  border-top: 1px solid var(--ink);
  overflow-x: auto;
}

.spine-node {
  flex: 1 1 0;
  min-width: 8.5rem;
  padding: 1.1rem 1rem 1.6rem;
  border-right: 1px solid var(--grid-strong);
}

.spine-node:last-child { border-right: none; }

button.spine-node {
  font: inherit;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
  background: none;
  border: none;
  border-right: 1px solid var(--grid-strong);
  cursor: pointer;
}

button.spine-node.is-open { background: var(--card); }

.spine-label {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  font-weight: 500;
  color: var(--graphite);
  margin-bottom: 0.85rem;
}

.spine-node--fixed .spine-label { color: var(--redline); }

/* tick dot, pulled up onto the top rule */
.tick {
  display: block;
  width: 9px;
  height: 9px;
  border: 1.5px solid var(--graphite);
  border-radius: 50%;
  background: var(--paper);
  margin: -1.35rem 0 0.75rem -1.32rem;
}

.spine-node--fixed .tick {
  border-color: var(--redline);
  background: var(--redline);
}

.spine-text {
  font-size: 0.98rem;
  line-height: 1.45;
  display: block;
  color: var(--body);
}

button.spine-node .spine-text {
  filter: blur(var(--blur-amount));
  opacity: var(--dim-opacity);
  transition: filter 0.4s ease, opacity 0.4s ease;
}

button.spine-node.is-open .spine-text {
  filter: none;
  opacity: 1;
}

.spine-hint {
  margin: 1.1rem 0 0;
  color: var(--graphite);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

/* -------------------------------------------------------------- sections */

.section {
  padding: clamp(3.5rem, 9vh, 6rem) 0;
}

.section--last {
  padding: clamp(3.5rem, 9vh, 6rem) 0 clamp(4rem, 10vh, 7rem);
}

.statement {
  font-family: Archivo, 'Arial Narrow', sans-serif;
  font-weight: 700;
  font-size: clamp(1.6rem, 1.1rem + 1.9vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -0.022em;
  max-width: 22ch;
  margin: 0 0 2rem;
}

.columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: clamp(1.8rem, 4vw, 3.2rem);
  max-width: 62rem;
}

.columns p {
  margin: 0;
  color: var(--body);
}

/* ------------------------------------------------------------ method list */

.method {
  list-style: none;
  max-width: 56rem;
  margin: 0;
  padding: 0;
}

.method li {
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  gap: 0 1.4rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--grid-strong);
  align-items: start;
}

.method li:last-child { border-bottom: 1px solid var(--grid-strong); }

.method-num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--redline);
  padding-top: 0.42rem;
}

.method h3 {
  font-family: Archivo, 'Arial Narrow', sans-serif;
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: -0.012em;
  margin: 0 0 0.3rem;
}

.method p {
  margin: 0;
  color: var(--body);
  font-size: 0.98rem;
  max-width: 52ch;
}

/* --------------------------------------------------------------- contact */

.contact-lede {
  max-width: 44ch;
  color: var(--body);
  margin: 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
  margin-top: 2.2rem;
}

.btn {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 0.85rem 1.4rem;
  text-decoration: none;
}

.btn--primary {
  border: 1px solid var(--redline);
  background: var(--redline);
  color: var(--paper);
}

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

.btn--ghost {
  border: 1px solid var(--ink);
  color: var(--ink);
}

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

/* ------------------------------------------------------------ case files */

.cases-head {
  padding: clamp(3rem, 9vh, 5.5rem) 0 clamp(2rem, 5vh, 3rem);
}

.cases-head .fig { margin-bottom: 1.4rem; }

.cases-head h1 {
  font-family: Archivo, 'Arial Narrow', sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 1.2rem + 5.2vw, 5rem);
  line-height: 0.96;
  letter-spacing: -0.032em;
  max-width: 20ch;
  margin: 0;
}

.cases-head h1 .second-line {
  font-weight: 400;
  color: var(--graphite);
  display: block;
}

.cases-lede {
  margin: 1.8rem 0 0;
  max-width: 48ch;
  color: var(--body);
  font-size: 1.1em;
}

.cases-meta {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding-bottom: 1.2rem;
  color: var(--graphite);
}

.cases-list {
  padding-bottom: clamp(4rem, 10vh, 7rem);
}

.case-stack {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.case {
  border: 1px solid var(--grid-strong);
  background: var(--card);
  padding: clamp(1.6rem, 3vw, 2.4rem);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(1.6rem, 3vw, 3rem);
}

.case:hover { border-color: var(--ink); }

.case-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.case-meta {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}

.case-no { color: var(--redline); }

.case-field { color: var(--graphite); }

.status {
  padding: 0.25rem 0.5rem;
}

.status--published {
  color: var(--paper);
  background: var(--ink);
}

.status--edit {
  color: var(--redline);
  border: 1px solid var(--redline);
}

.status--open {
  color: var(--graphite);
  border: 1px solid var(--grid-strong);
}

.case h2 {
  font-family: Archivo, 'Arial Narrow', sans-serif;
  font-size: clamp(1.4rem, 1rem + 1.2vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0;
}

.case-summary {
  margin: 0;
  color: var(--body);
  font-size: 1rem;
  max-width: 46ch;
}

.chips {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--graphite);
}

.chips span {
  border: 1px solid var(--grid-strong);
  padding: 0.25rem 0.5rem;
}

.trail {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  border-left: 1px solid var(--grid-strong);
  padding-left: clamp(1.2rem, 2.5vw, 2rem);
}

.trail-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 0.3rem;
}

.trail a,
.trail .trail-pending {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.55rem 0;
}

.trail a {
  color: var(--ink);
  border-bottom: 1px solid var(--grid-strong);
}

.trail a:hover { color: var(--redline); }

.trail a .arrow { color: var(--graphite); }

.trail a.trail-episode {
  color: var(--redline);
  border-bottom: none;
}

.trail a.trail-episode:hover { color: var(--ink); }

.trail a.trail-episode .arrow { color: inherit; }

.trail .trail-pending { color: var(--graphite); }

/* -------------------------------------------------------------- submit CTA */

.submit {
  border: 1px solid var(--ink);
  padding: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-top: 2.6rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.submit-copy {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.submit-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--redline);
}

.submit-copy p {
  margin: 0;
  font-family: Archivo, 'Arial Narrow', sans-serif;
  font-weight: 700;
  font-size: clamp(1.2rem, 1rem + 0.9vw, 1.7rem);
  letter-spacing: -0.018em;
  max-width: 26ch;
  line-height: 1.15;
}

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

.site-footer {
  border-top: 1px solid var(--ink);
  padding: 1.5rem 0 3rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  color: var(--graphite);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.footer-brand .mark {
  width: 22px;
  color: var(--graphite);
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 47rem) {
  .case {
    grid-template-columns: minmax(0, 1fr);
  }

  .trail {
    border-left: none;
    border-top: 1px solid var(--grid-strong);
    padding-left: 0;
    padding-top: 1.4rem;
  }
}

@media (max-width: 30rem) {
  .site-header {
    gap: 1rem;
  }

  .site-nav {
    gap: 1rem;
  }

  .submit {
    align-items: flex-start;
  }
}

/* --------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .rise {
    opacity: 1;
    transform: none;
  }
}