/* ---------------------------------------------------------------
   alexanderhutterer.com — single stylesheet
   No build step, no dependencies, no web fonts.
   --------------------------------------------------------------- */

:root {
  /* Dark by default for every visitor, regardless of their system setting.
     "dark only" also makes scrollbars and form controls dark to match. */
  color-scheme: dark only;

  /* Type: high-quality system serifs, so nothing is fetched over the network */
  --font-serif: "Iowan Old Style", "Palatino Linotype", "Palatino", "Charter",
    "Source Serif 4", ui-serif, Georgia, serif;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter,
    Helvetica, Arial, sans-serif;

  /* Fluid scale */
  --step--1: clamp(0.83rem, 0.8rem + 0.12vw, 0.9rem);
  --step-0: clamp(0.9rem, 0.87rem + 0.2vw, 1rem);
  --step-1: clamp(1.06rem, 1rem + 0.36vw, 1.26rem);
  --step-2: clamp(1.4rem, 1.25rem + 0.7vw, 1.75rem);
  --step-3: clamp(1.8rem, 1.5rem + 1.35vw, 2.5rem);

  --measure: 72ch;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  /* Colour — these are the dark values, used for everyone.
     The light palette is kept below in case you ever want to switch back:
       --ink: #17171a;  --ink-soft: #55555f;  --bg: #ffffff;
       --bg-sunk: #f7f6f4;  --rule: #e4e2de;  --accent: #7d1f2b;
     To restore automatic light/dark, set color-scheme back to "light dark"
     and wrap each pair as light-dark(lightValue, darkValue). */
  --ink: #ececf0;
  --ink-soft: #a6a6b0;
  --bg: #121214;
  --bg-sunk: #1b1b1f;
  --rule: #36363e;
  --accent: #e4909a;

  --radius: 10px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-block-start: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.6;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  width: 100%;
  max-width: calc(var(--measure) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

main.wrap {
  padding-block: clamp(2.5rem, 6vw, 4.5rem) 4rem;
}

/* Stack: uniform vertical rhythm without margin guesswork */
.stack > * + * {
  margin-block-start: var(--flow, 1.1em);
}

/* --- Skip link ------------------------------------------------- */

.skip {
  position: absolute;
  inset-inline-start: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--bg);
  padding: 0.6rem 1rem;
  z-index: 10;
}
.skip:focus {
  inset-inline-start: 0;
}

/* --- Header / nav ---------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-block-end: 1px solid var(--rule);
}

.site-header > .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 0.9rem;
}

.wordmark {
  font-size: var(--step-0);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: inherit;
}
.wordmark:hover {
  color: var(--accent);
}

.site-nav {
  display: flex;
  gap: clamp(0.9rem, 2.5vw, 1.6rem);
  font-family: var(--font-sans);
  font-size: var(--step--1);
  letter-spacing: 0.01em;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-block: 0.4rem;
  border-block-end: 1.5px solid transparent;
}
.site-nav a:hover {
  color: var(--ink);
}
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-block-end-color: var(--accent);
}

/* --- Headings & text ------------------------------------------- */

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin: 0;
  font-weight: 600;
}

h1 {
  font-size: var(--step-3);
}
h2 {
  font-size: var(--step-1);
  margin-block-start: 2.75em;
}
h3 {
  font-size: var(--step-0);
  margin-block-start: 2em;
}

h1 + .lede {
  margin-block-start: 0.75rem;
}

.lede {
  font-size: var(--step-1);
  line-height: 1.4;
  color: var(--ink-soft);
  text-wrap: pretty;
  max-width: 54ch;
}

p {
  margin: 0;
  text-wrap: pretty;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-block-end: 0.75rem;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  transition: text-decoration-color 120ms ease, color 120ms ease;
}
a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

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

hr {
  border: 0;
  border-block-start: 1px solid var(--rule);
  margin-block: 3rem;
}

/* --- Intro block (home) ---------------------------------------- */

.intro {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 46rem) {
  .intro {
    grid-template-columns: 1fr 10.5rem;
  }
  .intro .portrait {
    order: 2;
  }
}

.portrait {
  display: block;
  inline-size: 10.5rem;
  block-size: 13.125rem;
  max-inline-size: 100%;
  align-self: start;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--bg-sunk);
  border: 1px solid var(--rule);
}

/* --- Lists ------------------------------------------------------ */

ul,
ol {
  margin: 0;
  padding-inline-start: 1.2em;
}
li + li {
  margin-block-start: 0.4em;
}

.plain-list {
  list-style: none;
  padding: 0;
}

/* --- Research / publication entries ---------------------------- */

.entries {
  list-style: none;
  padding: 0;
  margin-block-start: 1.5rem;
  display: grid;
  gap: 1.75rem;
}

.entry {
  display: grid;
  gap: 0.35rem;
  padding-block-end: 1.75rem;
  border-block-end: 1px solid var(--rule);
}
.entry:last-child {
  border-block-end: 0;
  padding-block-end: 0;
}

/* Compact variant: title-only lists (work in progress) */
.entries--tight {
  gap: 0;
}
.entries--tight .entry {
  padding-block: 0.7rem;
  gap: 0.1rem;
}
.entries--tight .entry:last-child {
  padding-block-end: 0.7rem;
  border-block-end: 1px solid var(--rule);
}

.entry-title {
  font-size: var(--step-0);
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}

.entry-meta {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
}

.entry-abstract {
  font-size: var(--step--1);
  color: var(--ink-soft);
  line-height: 1.55;
}

/* Collapsible abstract — native, no JavaScript */
details.abstract {
  font-size: var(--step--1);
}
details.abstract > summary {
  cursor: pointer;
  font-family: var(--font-sans);
  color: var(--ink-soft);
  width: fit-content;
  list-style-position: outside;
}
details.abstract > summary:hover {
  color: var(--accent);
}
details.abstract > p {
  margin-block-start: 0.6rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-block-start: 0.3rem;
}

.tag {
  font-family: var(--font-sans);
  font-size: 0.73rem;
  letter-spacing: 0.02em;
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
}

.status {
  font-family: var(--font-sans);
  font-size: 0.73rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--accent);
}

/* --- CV: two-column rows that collapse on narrow screens ------- */

.cv-section {
  margin-block-start: 1.25rem;
}

.cv-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.15rem 1.5rem;
  padding-block: 0.85rem;
  border-block-start: 1px solid var(--rule);
}
.cv-row:first-of-type {
  border-block-start: 0;
}

@media (min-width: 40rem) {
  .cv-row {
    grid-template-columns: 8.5rem 1fr;
  }
}

.cv-when {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  padding-block-start: 0.2em;
}

.cv-what strong {
  font-weight: 600;
}
.cv-what .cv-note {
  display: block;
  font-size: var(--step--1);
  color: var(--ink-soft);
}

/* Subsection heading inside an h2 section */
.subhead {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-soft);
  margin-block-start: 2.25em;
}

/* --- Question sets (teaching materials) ------------------------ */

.qs-question {
  font-size: var(--step-2);
  line-height: 1.2;
  letter-spacing: -0.015em;
  text-wrap: pretty;
  margin-block: 1.75rem 0;
  padding-inline-start: 1.1rem;
  border-inline-start: 3px solid var(--accent);
}

.qs-note {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
  margin-block-start: 1rem;
}

.readings {
  list-style: none;
  padding: 0;
  margin-block-start: 1rem;
  display: grid;
  gap: 1rem;
  font-size: var(--step--1);
  line-height: 1.5;
}
.readings li {
  margin: 0;
  padding-inline-start: 1.1rem;
  border-inline-start: 1px solid var(--rule);
}
.readings .focus {
  display: block;
  color: var(--ink-soft);
  margin-block-start: 0.2rem;
}

.qs-index {
  list-style: none;
  padding: 0;
  margin-block-start: 1rem;
  display: grid;
  gap: 0;
}
.qs-index li {
  margin: 0;
  border-block-start: 1px solid var(--rule);
}
.qs-index li:last-child {
  border-block-end: 1px solid var(--rule);
}
.qs-index a {
  display: grid;
  gap: 0.15rem;
  padding-block: 0.85rem;
  text-decoration: none;
}
.qs-index a:hover .qs-index-title {
  color: var(--accent);
}
.qs-index-title {
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: var(--step-0);
  margin: 0;
  line-height: 1.3;
}
.qs-index-q {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
  line-height: 1.45;
}

.exam-list {
  margin-block-start: 1rem;
  padding-inline-start: 1.6em;
  font-size: var(--step--1);
  line-height: 1.5;
}
.exam-list li {
  margin-block-start: 0.7em;
  padding-inline-start: 0.2em;
}
.exam-list li::marker {
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 0.85em;
}

.backlink {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
  text-decoration: none;
  display: inline-block;
  margin-block-end: 1.25rem;
}
.backlink:hover {
  color: var(--accent);
}

/* --- Callout --------------------------------------------------- */

.callout {
  background: var(--bg-sunk);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(1rem, 3vw, 1.5rem);
  font-size: var(--step--1);
}
.callout :first-child {
  margin-block-start: 0;
}

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

.site-footer {
  border-block-start: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
}
.site-footer > .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  padding-block: 1.5rem 2.5rem;
}
.site-footer a {
  color: inherit;
}

/* --- Utilities --------------------------------------------------- */

.contact-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.4rem;
  font-size: var(--step--1);
}
.contact-list .label {
  font-family: var(--font-sans);
  color: var(--ink-soft);
  display: inline-block;
  min-width: 5.5rem;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    transition-duration: 0.01ms !important;
  }
}

@media print {
  /* Screen is dark; paper should not be. Print black on white. */
  :root {
    color-scheme: light only;
    --ink: #000;
    --ink-soft: #444;
    --bg: #fff;
    --bg-sunk: #fff;
    --rule: #bbb;
    --accent: #7d1f2b;
  }
  .site-header,
  .site-footer,
  .skip {
    display: none;
  }
  body {
    font-size: 10pt;
  }
}