/* peter-portfolio — G3 design pass
   Signature device: the case-card "core" (decision + proof) — a raised,
   accent-tinted block with a left rule and a step up in type size, so the
   decision line is the first thing a scanning eye lands on. Everything
   else (hero, how-i-work, stack, contact) stays quiet and typographic.
   Palette: white/cool-gray paper + a single muted deep-teal accent —
   deliberately not cream+serif+terracotta, not near-black+acid, not a
   hairline-rule broadsheet grid. System font stack only (weight budget). */

/* ---------- Reset (light touch) ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
}

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

/* ---------- Base ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f2f4f5;
  --color-text: #15181e;
  --color-muted: #5b616e;
  --color-border: #dfe2e7;

  --color-accent: #0e5f52;
  --color-accent-strong: #0a473d;
  --color-accent-tint: #e4f1ee;
  --color-accent-ink: #ffffff;

  --focus-color: #1a56ff;

  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;

  --max-width: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12141a;
    --color-bg-soft: #191c23;
    --color-text: #eef0f3;
    --color-muted: #a7adba;
    --color-border: #2c303a;

    --color-accent: #55d6bb;
    --color-accent-strong: #8fe6d2;
    --color-accent-tint: rgba(85, 214, 187, 0.12);
    --color-accent-ink: #06231d;

    --focus-color: #7fa4ff;
  }
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.55;
  font-size: 1rem;
  overflow-x: hidden;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.wrap {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 var(--space-2);
}

a {
  color: inherit;
}

section {
  padding-block: var(--space-4);
}

.section-heading {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}

/* ---------- Accessibility: focus + motion ---------- */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus-color);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-bg);
  color: var(--color-text);
  padding: var(--space-1) var(--space-2);
  z-index: 100;
  border: 1px solid var(--color-border);
}

.skip-link:focus {
  left: var(--space-2);
  top: var(--space-2);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
  padding-block: var(--space-2);
}

.site-header__name {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-header__nav {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.site-header__nav a {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--color-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-header__nav a:hover {
  color: var(--color-text);
  border-color: var(--color-border);
}

/* ---------- Hero ---------- */
.hero {
  padding-block: var(--space-5);
}

.hero__role {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.hero__headline {
  font-size: clamp(1.65rem, 4.4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.015em;
  max-width: 42rem;
  margin: 0 0 var(--space-3);
  padding: 0;
  border: none;
}

.hero__supporting {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 38rem;
}

.hero__cta {
  margin-top: var(--space-3);
}

/* ---------- Buttons ---------- */
.button {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: 0.375rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--color-accent);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.button--primary {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.button--primary:hover {
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
}

/* ---------- Case studies ---------- */
.case-studies {
  background: var(--color-bg-soft);
}

.case-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  /* Accommodates a fourth card later without redesign: auto-fit keeps
     cards at a sane width whether there are 3 or 4. */
  .case-grid {
    grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  }
}

.case-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.case-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0;
}

.case-card__what {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin: 0;
}

/* The signature device: decision → proof, raised out of the quiet card
   with a left rule and accent tint. This is the one place the design
   spends boldness — everything around it stays plain. */
.case-card__core {
  background: var(--color-accent-tint);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 0.5rem 0.5rem 0;
  padding: var(--space-2) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.case-card__decision {
  font-size: 1.15rem;
  font-weight: 650;
  line-height: 1.4;
  margin: 0;
  color: var(--color-text);
}

.case-card__proof {
  font-size: 0.92rem;
  color: var(--color-text);
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.case-card__decision-label,
.case-card__proof-label,
.case-card__shows-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.case-card__decision-label {
  color: var(--color-accent-strong);
}

.case-card__proof-label {
  color: var(--color-muted);
}

.case-card__shows {
  margin: 0;
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.9rem;
}

.case-card__shows-label {
  color: var(--color-muted);
}

/* ---------- How I work ---------- */
.loop {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

@media (min-width: 640px) {
  .loop {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .loop li {
    flex: 1 1 auto;
  }

  .loop li:not(:last-child)::after {
    content: "→";
    margin-inline-start: var(--space-2);
    color: var(--color-muted);
  }
}

.loop__step {
  font-weight: 600;
  font-size: 1.05rem;
}

/* ---------- Stack ---------- */
.stack {
  background: var(--color-bg-soft);
}

.stack-groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .stack-groups {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .stack-groups {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stack-group__title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin-bottom: var(--space-1);
}

.stack-group__list {
  margin: 0;
}

/* ---------- Contact ---------- */
.contact__authorization {
  color: var(--color-muted);
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.contact-list a {
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 0.2em;
  font-weight: 600;
  font-size: 1.05rem;
  transition: text-decoration-color 0.15s ease;
}

.contact-list a:hover {
  text-decoration-color: currentColor;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-2);
}

.version-stamp {
  color: var(--color-muted);
  font-size: 0.8rem;
  margin: 0;
}