/* ============================================================
   SUMS — shared styles for every page
   Change the colors here and the whole site updates.
   ============================================================ */

:root {
  --paper: #f3ecdc;      /* page background */
  --grid: #e3e7f0;       /* graph-paper lines */
  --card: #ffffff;
  --ink: #1b2340;        /* main text */
  --muted: #5d6685;
  --accent: #2f4fd8;     /* links, buttons, event chips */
  --accent-soft: #e4e9ff;
  --highlight: #f4c430;  /* today's date */

  --font-display: "Computer Modern Serif", Georgia, serif;
  --font-body: "Computer Modern Serif", Georgia, serif;
  --font-mono: "Computer Modern Typewriter", monospace;
}

/* Dark mode: follows the visitor's device setting */
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12162a;
    --grid: #1d2340;
    --card: #1a1f38;
    --ink: #e8ebf7;
    --muted: #9aa3c4;
    --accent: #8ea2ff;
    --accent-soft: #263063;
    --highlight: #e0b425;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--paper);
}

a { color: var(--accent); }

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header / navigation ---------- */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--grid);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
}
.brand .sigma {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--accent);
  color: var(--card);
  border-radius: 8px;
  font-size: 1.5rem;
}
nav ul {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
nav a {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
}
nav a:hover { color: var(--ink); background: var(--accent-soft); }
nav a.active { color: var(--accent); background: var(--accent-soft); }

/* ---------- Page headings ---------- */
.page-intro { padding: 48px 0 24px; }
.page-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  margin: 0 0 12px;
  text-wrap: balance;
}
.page-intro p { color: var(--muted); max-width: 60ch; margin: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 6px;
}
.muted { color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--grid);
  border-radius: 12px;
  padding: 24px;
}

main { padding-bottom: 64px; }
section + section { margin-top: 32px; }

/* ---------- Calendar ---------- */
.calendar-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 20px;
  align-items: start;
}
.calendar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.calendar-head h2 {
  font-family: var(--font-display);
  margin: 0;
  font-size: 1.5rem;
}
.calendar-head button {
  font: inherit;
  font-size: 1.2rem;
  width: 40px;
  height: 40px;
  border: 1px solid var(--grid);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}
.calendar-head button:hover { background: var(--accent-soft); }

.weekdays, .calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 4px;
}
.weekdays div {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  padding-bottom: 6px;
}
.day {
  min-height: 90px;
  border: 1px solid var(--grid);
  border-radius: 6px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.day.empty { border-color: transparent; }
.day-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
}
.day.today .day-num {
  background: var(--highlight);
  color: #1b2340;
  border-radius: 999px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-weight: 700;
}
.event-chip {
  font: inherit;
  font-size: 0.75rem;
  text-align: left;
  border: none;
  border-radius: 4px;
  padding: 3px 6px;
  background: var(--accent);
  color: var(--card);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.event-chip:hover, .event-chip:focus-visible { outline: 2px solid var(--ink); }

#event-detail h3 { font-family: var(--font-display); margin: 0 0 4px; font-size: 1.3rem; }

/* ---------- Event list (Events page) ---------- */
.event-list { display: flex; flex-direction: column; gap: 12px; }
.event-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: start;
}
.date-block {
  text-align: center;
  border: 1px solid var(--grid);
  border-radius: 8px;
  padding: 8px 0;
  font-family: var(--font-mono);
  line-height: 1.2;
}
.date-block .m { font-size: 0.75rem; text-transform: uppercase; color: var(--accent); }
.date-block .d { font-size: 1.6rem; font-weight: 700; }
.event-row h3 { margin: 0; font-family: var(--font-display); font-size: 1.2rem; }
.event-row p { margin: 4px 0 0; }
.past { opacity: 0.6; }

/* ---------- Members ---------- */
.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.member {
  text-align: center;
}
.avatar {
  width: 72px;
  height: 72px;
  margin: 0 auto 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
}
.member h3 { margin: 0; font-size: 1.05rem; }
.member .role { color: var(--accent); font-size: 0.9rem; margin: 2px 0 8px; }
.member p { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--grid);
  background: var(--card);
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---------- Phones ---------- */
@media (max-width: 720px) {
  .calendar-layout { grid-template-columns: 1fr; }
  .day { min-height: 56px; padding: 3px; }
  .event-chip { font-size: 0; padding: 0; height: 8px; } /* shrink to a dot-bar on small screens */
}

.logo {
  height: 40px;
  width: auto;
}

/* Sharper corners */
.card,
.day,
.date-block,
.event-chip,
.calendar-head button,
nav a {
  border-radius: 2px;
}