/* ------------------------------------------------------------------
   Diego Serrano — personal academic site
   One stylesheet, no build step. Palette and type live in :root.

   Palette: pine green identity rail, green-biased neutrals.
   Type:    Newsreader (display) + Source Sans 3 (body), from Google
            Fonts, each with a real fallback stack.
------------------------------------------------------------------ */

:root {
  /* surfaces and ink — neutrals biased green, not flat grey */
  --bg:         #fcfdfb;
  --surface:    #f0f5f1;
  --ink:        #17211c;
  --ink-soft:   #5b6b63;
  --rule:       #dde5df;

  /* green identity */
  --green-deep: #123a2d;
  --green:      #1c5a45;
  --green-lift: #2f8a67;
  --green-tint: #e2f0e8;

  --accent:      var(--green);
  --accent-tint: var(--green-tint);

  /* the identity rail */
  --rail:        var(--green-deep);
  --rail-ink:    #e8f2ec;
  --rail-soft:   #9dbdae;
  --rail-rule:   #295044;
  --rail-active: #8fd9b7;

  --award: #b07c1f;

  --display: "Newsreader", Georgia, "Times New Roman", serif;
  --body: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;

  --rail-w: 268px;
  --measure: 38rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:         #0e1412;
    --surface:    #16201b;
    --ink:        #e7ede9;
    --ink-soft:   #97a69e;
    --rule:       #26322b;

    --green-deep: #0b1a15;
    --green:      #6fc79c;
    --green-lift: #8fd9b7;
    --green-tint: #17291f;

    --rail:        #101b16;
    --rail-ink:    #dfeae4;
    --rail-soft:   #8aa295;
    --rail-rule:   #223228;
    --rail-active: #8fd9b7;

    --award: #d8ab55;
  }
}

:root[data-theme="dark"] {
  --bg:         #0e1412;
  --surface:    #16201b;
  --ink:        #e7ede9;
  --ink-soft:   #97a69e;
  --rule:       #26322b;

  --green-deep: #0b1a15;
  --green:      #6fc79c;
  --green-lift: #8fd9b7;
  --green-tint: #17291f;

  --rail:        #101b16;
  --rail-ink:    #dfeae4;
  --rail-soft:   #8aa295;
  --rail-rule:   #223228;
  --rail-active: #8fd9b7;

  --award: #d8ab55;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------------------------------------------------------- layout */

.layout {
  display: flex;
  min-height: 100vh;
  align-items: flex-start;
}

main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 4rem 3rem 5rem;
}

.content {
  max-width: var(--measure);
  margin-inline: auto; /* keeps the column centred on wide monitors */
}

/* ----------------------------------------------- the identity rail */

.sidebar {
  width: var(--rail-w);
  flex: 0 0 var(--rail-w);
  position: sticky;
  top: 0;
  align-self: flex-start;
  height: 100vh;
  overflow-y: auto;
  padding: 2.75rem 1.9rem;
  background: var(--rail);
  color: var(--rail-ink);
  display: flex;
  flex-direction: column;
  gap: 1.9rem;
}

.identity { display: block; }

.portrait {
  display: block;
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--rail-rule);
  box-shadow: 0 0 0 1px var(--rail-rule), 0 0 0 6px rgba(143, 217, 183, 0.09);
  margin-bottom: 1.4rem;
}

.sidebar .name {
  font-family: var(--display);
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0 0 0.5rem;
  font-weight: 500;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.sidebar .name a {
  color: var(--rail-ink);
  text-decoration: none;
}

.sidebar .name a:hover { color: var(--rail-active); }

.sidebar .role {
  margin: 0;
  font-size: 0.88rem;
  color: var(--rail-soft);
  line-height: 1.5;
}

nav.site ul,
.elsewhere ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

nav.site a {
  display: block;
  padding: 0.22rem 0;
  color: var(--rail-ink);
  text-decoration: none;
  font-size: 1rem;
  width: fit-content;
  border-bottom: 1px solid transparent;
}

nav.site a:hover { border-bottom-color: var(--rail-active); }

nav.site a[aria-current="page"] {
  color: var(--rail-active);
  font-weight: 600;
}

.elsewhere {
  border-top: 1px solid var(--rail-rule);
  padding-top: 1.25rem;
  font-size: 0.87rem;
  margin-top: auto;
}

.elsewhere h2 {
  font-family: var(--body);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rail-soft);
  margin: 0 0 0.7rem;
  font-weight: 600;
  border: none;
  padding: 0;
}

.elsewhere a {
  color: var(--rail-soft);
  text-decoration: none;
}

.elsewhere a:hover {
  color: var(--rail-active);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ------------------------------------------------------------ text */

h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 2.7rem;
  line-height: 1.1;
  letter-spacing: -0.022em;
  margin: 0 0 2rem;
  text-wrap: balance;
}

h2 {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.32rem;
  color: var(--green);
  margin: 3rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
  text-wrap: balance;
}

p { margin: 0 0 1.15rem; }

a {
  color: var(--green);
  text-decoration-color: color-mix(in srgb, var(--green) 40%, transparent);
  text-underline-offset: 2px;
}

a:hover { color: var(--green-lift); text-decoration-color: currentColor; }

em { font-style: italic; }

.lead {
  font-size: 1.14rem;
  line-height: 1.6;
}

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

ul.plain {
  list-style: none;
  padding: 0;
  margin: 0 0 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

ul.plain li {
  padding-left: 1.05rem;
  position: relative;
}

ul.plain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  opacity: 0.55;
}

/* --------------------------------------------------- entry listing */

.entries {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.entries > li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.entries > li:last-child { border-bottom: none; }

.entry-title {
  display: block;
  font-weight: 600;
  font-size: 1.04rem;
  line-height: 1.4;
  margin-bottom: 0.25rem;
  text-wrap: balance;
}

.entry-meta {
  color: var(--ink-soft);
  font-size: 0.94rem;
  margin: 0 0 0.5rem;
  line-height: 1.55;
}

.entries p:last-of-type { margin-bottom: 0; }

/* Badges carry information — an award, an invitation — never decoration. */
.badge {
  display: inline-block;
  font-family: var(--body);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.12rem 0.5rem;
  border-radius: 3px;
  vertical-align: 0.14em;
  margin-left: 0.45rem;
  white-space: nowrap;
}

.badge-award {
  color: var(--award);
  border: 1px solid color-mix(in srgb, var(--award) 45%, transparent);
  background: color-mix(in srgb, var(--award) 11%, transparent);
}

.badge-invited {
  color: var(--green);
  border: 1px solid color-mix(in srgb, var(--green) 45%, transparent);
  background: var(--green-tint);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.7rem;
}

.links a {
  font-size: 0.79rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-decoration: none;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
  background: var(--surface);
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.links a:hover {
  color: var(--green);
  border-color: color-mix(in srgb, var(--green) 50%, transparent);
  background: var(--green-tint);
}

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

/* --------------------------------------------------- misc elements */

.facts {
  margin: 0 0 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.facts dt {
  font-weight: 600;
  font-size: 0.97rem;
  color: var(--ink);
}

.facts dd {
  margin: 0.1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.97rem;
}

.facts dd a { color: var(--green); }

.todo {
  border-left: 3px solid var(--award);
  background: color-mix(in srgb, var(--award) 9%, transparent);
  padding: 0.8rem 1rem;
  margin: 2rem 0 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
  border-radius: 0 3px 3px 0;
}

.todo strong { color: var(--ink); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.87em;
  background: var(--surface);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

footer.page {
  margin-top: 4rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--rule);
  font-size: 0.82rem;
  color: var(--ink-soft);
}

footer.page p { margin: 0; }

/* Visit count. Deliberately quiet: it is for him, not for the reader.
   Counted once per browsing session, not once per page. */
.visits {
  margin-top: 0.3rem !important;
  font-size: 0.78rem;
  color: var(--ink-soft);
  opacity: 0.55;
  transition: opacity 150ms ease;
}

.visits:hover { opacity: 1; }

.visits[hidden] { display: none; }

/* ---------------------------------------------------- mobile shift */

@media (max-width: 860px) {
  body { font-size: 16px; }

  .layout { display: block; }

  .sidebar {
    position: static;
    width: auto;
    height: auto;
    flex: none;
    padding: 1.9rem 1rem 1.4rem;
    display: block;
  }

  .identity {
    display: grid;
    grid-template-columns: 78px 1fr;
    gap: 0 1.1rem;
    align-items: center;
  }

  .portrait {
    width: 78px;
    height: 78px;
    margin-bottom: 0;
    grid-row: span 2;
  }

  .sidebar .name { font-size: 1.24rem; margin-bottom: 0.2rem; }
  .sidebar .role { font-size: 0.82rem; }

  nav.site ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.1rem 1.2rem;
    margin-top: 1.25rem;
  }

  .elsewhere {
    margin-top: 1.2rem;
    padding-top: 1rem;
  }

  .elsewhere ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.2rem 1.1rem;
  }

  main { padding: 2.25rem 1rem 3.5rem; }

  h1 { font-size: 2rem; margin-bottom: 1.4rem; }
  h2 { margin-top: 2.4rem; }
  .lead { font-size: 1.06rem; }
}