/* Portfolio styles. Plain CSS, no build step.
   Palette is "chart paper": cool paper, navy ink, a baseline-band blue,
   and one signal colour used only for things that are flagged. */

@font-face {
  font-family: "Instrument Sans";
  src: url("assets/fonts/instrument-sans-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #f2f5f3;
  --paper-raised: #ffffff;
  --ink: #1b2a41;
  --ink-soft: #4a5a6e;
  --grid: #dbe3df;
  --band: #bfd7ea;
  --signal: #c2255c;

  --font: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Type scale: 1.25 ratio from a 18px base */
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.3125rem;
  --step-2: 1.625rem;
  --step-3: clamp(1.75rem, 1.2rem + 2.2vw, 2.5rem);
  --step-4: clamp(2.25rem, 1.4rem + 3.6vw, 4rem);

  --measure: 38rem;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-space: clamp(4rem, 9vw, 7.5rem);
  --radius: 6px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 4.5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

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

.wrap {
  width: min(100% - 2 * var(--gutter), 68rem);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: var(--paper);
  z-index: 20;
}

.skip-link:focus {
  top: 1rem;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  border-bottom: 1px solid var(--grid);
}

@supports (backdrop-filter: blur(1px)) {
  .site-header {
    backdrop-filter: blur(8px);
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.5rem;
}

.site-header__name {
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.nav {
  display: flex;
  gap: clamp(0.75rem, 2vw, 1.75rem);
  font-size: var(--step--1);
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

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

.nav .nav__contact {
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 46rem) {
  .site-header__name {
    display: none;
  }

  .site-header__inner {
    justify-content: flex-start;
  }

  .nav {
    overflow-x: auto;
    scrollbar-width: none;
  }
}

/* Buttons */

.button {
  display: inline-block;
  padding: 0.7rem 1.15rem;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  font-size: var(--step--1);
  font-weight: 600;
  text-decoration: none;
  line-height: 1.2;
}

.button:hover {
  background: var(--paper-raised);
}

.button--solid {
  background: var(--ink);
  color: var(--paper);
}

.button--solid:hover {
  background: #2a3d5a;
}

/* Hero */

.hero {
  padding-top: clamp(3rem, 8vw, 6rem);
}

.hero__role {
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-weight: 500;
}

.hero__title {
  max-width: 17ch;
  margin-top: 1rem;
  font-size: var(--step-4);
  font-weight: 650;
  line-height: 1.05;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.hero__lede {
  max-width: var(--measure);
  margin-top: 1.5rem;
  color: var(--ink-soft);
  font-size: var(--step-1);
  line-height: 1.5;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* The signature chart */

.hero-chart {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding: 1rem 0 0.75rem;
  border-block: 1px solid var(--grid);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: -1px -1px;
}

.hero-chart__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.hero-chart__band {
  fill: var(--band);
  opacity: 0.65;
}

.hero-chart__mean {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1;
  stroke-dasharray: 4 6;
  opacity: 0.45;
}

.hero-chart__line {
  fill: none;
  stroke: var(--ink);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.hero-chart__wipe {
  fill: var(--paper);
  transform: scaleX(0);
  transform-box: fill-box;
  transform-origin: right center;
}

.hero-chart__halo {
  fill: var(--signal);
  opacity: 0.15;
}

.hero-chart__dot {
  fill: var(--signal);
}

.hero-chart__leader {
  fill: none;
  stroke: var(--signal);
  stroke-width: 1.5;
}

.hero-chart__note {
  fill: var(--signal);
  font-family: var(--font);
  font-size: 19px;
  font-weight: 600;
}

.hero-chart__caption {
  margin-top: 0.5rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

/* On small screens the SVG label would be unreadably small; the caption carries it. */
@media (max-width: 40rem) {
  .hero-chart__note,
  .hero-chart__leader {
    display: none;
  }
}

/* The one orchestrated moment: the line draws in, then the flag appears. */
@media (prefers-reduced-motion: no-preference) {
  .hero-chart__wipe {
    transform: scaleX(1);
    animation: wipe 1.4s cubic-bezier(0.6, 0, 0.3, 1) 0.2s forwards;
  }

  .hero-chart__flag {
    opacity: 0;
    animation: appear 0.5s ease-out 1.25s forwards;
  }

  .hero-chart__halo {
    transform-box: fill-box;
    transform-origin: center;
    animation: ping 1.2s ease-out 1.5s 2;
  }
}

@keyframes wipe {
  to {
    transform: scaleX(0);
  }
}

@keyframes appear {
  to {
    opacity: 1;
  }
}

@keyframes ping {
  0% {
    transform: scale(1);
    opacity: 0.35;
  }
  100% {
    transform: scale(2.4);
    opacity: 0;
  }
}

/* KPI readouts */

.readouts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(2rem, 5vw, 3rem);
  border-top: 2px solid var(--ink);
}

.readout {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  gap: 0.35rem;
  padding: 1rem 1.25rem 0 0;
}

.readout + .readout {
  padding-left: 1.25rem;
  border-left: 1px solid var(--grid);
}

.readout dd {
  font-size: var(--step-3);
  font-weight: 650;
  line-height: 1;
  letter-spacing: -0.02em;
}

.readout dt {
  max-width: 22ch;
  color: var(--ink-soft);
  font-size: var(--step--1);
  line-height: 1.35;
}

@media (max-width: 52rem) {
  .readouts {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 1.5rem;
  }

  .readout:nth-child(3) {
    padding-left: 0;
    border-left: 0;
  }
}

/* Sections */

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

.section__title {
  font-size: var(--step-3);
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.section__lede {
  max-width: var(--measure);
  margin-top: 0.75rem;
  color: var(--ink-soft);
  font-size: var(--step-1);
  line-height: 1.5;
}

/* Story timeline */

.timeline {
  --spine-x: 7.5rem;
  position: relative;
  margin-top: 3rem;
}

.timeline::before,
.timeline::after {
  content: "";
  position: absolute;
  top: 0.6rem;
  bottom: 0;
  left: var(--spine-x);
  width: 2px;
  background: var(--grid);
}

.timeline::after {
  background: var(--ink);
  transform: scaleY(1);
  transform-origin: top;
}

.chapter {
  position: relative;
  display: grid;
  grid-template-columns: var(--spine-x) 1fr;
  padding-bottom: clamp(2.5rem, 5vw, 3.5rem);
}

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

.chapter::before {
  content: "";
  position: absolute;
  top: 0.45rem;
  left: calc(var(--spine-x) - 5px);
  width: 12px;
  height: 12px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  z-index: 1;
}

.chapter--now::before {
  background: var(--signal);
  border-color: var(--signal);
}

.chapter__when {
  padding-right: 1.5rem;
  color: var(--ink-soft);
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.2;
  text-align: right;
}

.chapter__body {
  max-width: calc(var(--measure) + 2rem);
  padding-left: 2rem;
}

.chapter__title {
  font-size: var(--step-1);
  font-weight: 650;
  line-height: 1.25;
}

.chapter__role {
  display: block;
  margin-top: 0.15rem;
  color: var(--ink-soft);
  font-size: var(--step-0);
  font-weight: 450;
}

.chapter__body > p {
  margin-top: 0.75rem;
}

.chapter__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.chapter__facts li {
  padding: 0.3rem 0.65rem;
  background: var(--paper-raised);
  border: 1px solid var(--grid);
  border-radius: 4px;
  font-size: var(--step--1);
}

.chapter__facts strong {
  font-weight: 700;
}

@media (max-width: 40rem) {
  .timeline {
    --spine-x: 0.4rem;
  }

  .chapter {
    grid-template-columns: 1fr;
    padding-left: 1.75rem;
  }

  .chapter__when {
    padding: 0;
    text-align: left;
    font-size: var(--step-0);
  }

  .chapter__body {
    padding-left: 0;
    margin-top: 0.25rem;
  }
}

/* Spine fills as the story scrolls past. Browsers without scroll timelines
   just show the full line. */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .timeline::after {
      transform: scaleY(0);
      animation: fill-spine linear both;
      animation-timeline: view();
      animation-range: entry 40% exit 60%;
    }
  }
}

@keyframes fill-spine {
  to {
    transform: scaleY(1);
  }
}

/* Case files */

.case-list {
  margin-top: 2.5rem;
  border-top: 2px solid var(--ink);
}

.case {
  border-bottom: 1px solid var(--grid);
}

.case__summary {
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  align-items: start;
  gap: 1.25rem;
  padding: 1.5rem 0;
  cursor: pointer;
  list-style: none;
}

.case__summary::-webkit-details-marker {
  display: none;
}

.case__summary::after {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  margin: 0.45rem 0.25rem 0 0;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.case[open] > .case__summary::after {
  transform: translateY(0.3rem) rotate(-135deg);
}

.case__summary:hover .case__title {
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.2em;
}

.case__glyph {
  width: 4rem;
  height: auto;
  margin-top: 0.2rem;
}

.case__heading {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  max-width: calc(var(--measure) + 4rem);
}

.case__title {
  font-size: var(--step-1);
  font-weight: 650;
  line-height: 1.25;
}

.case__outcome {
  color: var(--ink-soft);
}

.case__steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-left: 5.25rem;
  padding-bottom: 1.25rem;
}

.case__steps > div {
  padding-top: 0.75rem;
  border-top: 2px solid var(--band);
}

.case__steps > div:nth-child(3) {
  border-top-color: var(--ink);
}

.case__steps dt {
  font-weight: 650;
}

.case__steps dd {
  margin-top: 0.35rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
  line-height: 1.55;
}

.case__tools {
  margin-left: 5.25rem;
  padding-bottom: 1.75rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.case__tools::before {
  content: "Tools: ";
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 52rem) {
  .case__steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 40rem) {
  .case__summary {
    grid-template-columns: 1fr auto;
  }

  .case__glyph {
    display: none;
  }

  .case__steps {
    grid-template-columns: 1fr;
    margin-left: 0;
  }

  .case__tools {
    margin-left: 0;
  }
}

/* Shared glyph strokes and fills */

.glyph-band {
  fill: var(--band);
}

.glyph-line {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.glyph-line--thick {
  stroke-width: 4;
}

.glyph-bar {
  fill: var(--ink);
}

.glyph-bar--muted {
  fill: var(--band);
}

.glyph-node {
  fill: var(--paper-raised);
  stroke: var(--ink);
  stroke-width: 2;
}

.glyph-flag {
  fill: var(--signal);
}

/* Method */

.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 2.75rem;
  counter-increment: step;
}

.step::before {
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-size: var(--step--1);
  font-weight: 650;
}

.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 1rem;
  left: 2.5rem;
  right: -0.75rem;
  height: 2px;
  background: var(--grid);
}

.step__title {
  font-size: var(--step-0);
  font-weight: 650;
}

.step p {
  margin-top: 0.35rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.ai-note {
  max-width: calc(var(--measure) + 6rem);
  margin-top: 3rem;
  padding: 1.5rem 1.75rem;
  background: var(--paper-raised);
  border-left: 4px solid var(--band);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.ai-note__title {
  font-size: var(--step-1);
  font-weight: 650;
}

.ai-note p {
  margin-top: 0.5rem;
}

@media (max-width: 52rem) {
  .steps {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .step {
    padding: 0.2rem 0 0 3rem;
  }

  .step:not(:last-child)::after {
    top: 2.5rem;
    bottom: -1.25rem;
    left: 0.95rem;
    right: auto;
    width: 2px;
    height: auto;
  }
}

/* Projects */

.project-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.project {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.5rem;
  background: var(--paper-raised);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
}

.project__glyph {
  width: 3rem;
  height: 3rem;
  margin-bottom: 0.25rem;
}

.project .project__status {
  align-self: flex-start;
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--grid);
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-weight: 500;
}

.project__title {
  font-size: var(--step-1);
  font-weight: 650;
  line-height: 1.25;
}

.project p {
  color: var(--ink-soft);
}

.project .project__tools {
  margin-top: auto;
  padding-top: 0.5rem;
  color: var(--ink);
  font-size: var(--step--1);
  font-weight: 500;
}

@media (max-width: 52rem) {
  .project-list {
    grid-template-columns: 1fr;
  }
}

/* Skills */

.skill-groups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 3rem;
  max-width: 56rem;
  margin-top: 2rem;
}

.skill-groups > div {
  padding-top: 0.75rem;
  border-top: 1px solid var(--grid);
}

.skill-groups dt {
  font-weight: 650;
}

.skill-groups dd {
  margin-top: 0.3rem;
  color: var(--ink-soft);
}

@media (max-width: 40rem) {
  .skill-groups {
    grid-template-columns: 1fr;
  }
}

/* Contact */

.contact {
  padding-bottom: var(--section-space);
}

.contact__lede {
  max-width: var(--measure);
  margin-top: 0.75rem;
  font-size: var(--step-1);
  line-height: 1.5;
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* Footer */

.site-footer {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--grid);
  color: var(--ink-soft);
  font-size: var(--step--1);
}

/* Draft mode (?draft): outline placeholder content still to replace */

.is-draft [data-placeholder] {
  outline: 2px dashed var(--signal);
  outline-offset: 4px;
}

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

  .case__summary::after {
    transition: none;
  }
}