/* Alpha Beta Gamma — Zeta Beta Chapter (CCSF)
   Colors: scarlet red, black, white
   Dark mode: follows the visitor's device setting until they use the switch. */

:root {
  --scarlet: #b3121c;
  --scarlet-dark: #8c0d15;
  --ink: #121212;
  --text: #2a2a2a;
  --muted: #5f5f5f;
  --line: #e7e4e0;
  --paper: #ffffff;
  --soft: #f7f5f2;
  --surface: #ffffff;
  --accent: #b3121c;          /* scarlet used for text/icons */
  --header-bg: rgba(255,255,255,.94);
  --band: #121212;            /* dark band + footer */
  --on-ink: #ffffff;          /* text on an --ink background */
  --switch-off: #e3e1de;
  --logo-ring: transparent;
  --radius: 10px;
  --max: 1120px;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
  --ink: #f3f3f3;
  --text: #d6d6d6;
  --muted: #a3a3a3;
  --line: #2d2d31;
  --paper: #0e0e10;
  --soft: #161619;
  --surface: #1b1b1f;
  --accent: #ff5c66;
  --header-bg: rgba(14,14,16,.92);
  --band: #050506;
  --on-ink: #0e0e10;
  --switch-off: #3a3a3f;
  --logo-ring: rgba(255,255,255,.85);
  color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #f3f3f3;
  --text: #d6d6d6;
  --muted: #a3a3a3;
  --line: #2d2d31;
  --paper: #0e0e10;
  --soft: #161619;
  --surface: #1b1b1f;
  --accent: #ff5c66;
  --header-bg: rgba(14,14,16,.92);
  --band: #050506;
  --on-ink: #0e0e10;
  --switch-off: #3a3a3f;
  --logo-ring: rgba(255,255,255,.85);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s, color .25s;
}

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

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent); opacity: .8; }

h1, h2, h3 {
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 .5em;
  font-weight: 600;
  text-wrap: balance;
}
h1 { font-size: clamp(2.3rem, 5.5vw, 3.8rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.35rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--ink); color: var(--on-ink); padding: 8px 12px; z-index: 100; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 14px; height: 68px; }
.brand { margin-right: auto; }

.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand-mark {
  width: 40px; height: 40px; border-radius: 8px;
  background: var(--scarlet); color: #fff;
  display: grid; place-items: center;
  font-family: var(--serif); font-weight: 700; font-size: 1.05rem; letter-spacing: .02em;
}
.brand-logo { width: 44px; height: 44px; border-radius: 50%; flex: none; box-shadow: 0 0 0 2px var(--logo-ring); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-family: var(--serif); font-size: 1.08rem; font-weight: 600; }
.brand-text span { font-size: .78rem; color: var(--muted); letter-spacing: .02em; }

.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 6px; align-items: center; }
.nav a {
  display: block; padding: 8px 14px; border-radius: 6px;
  text-decoration: none; color: var(--text); font-weight: 500; font-size: .95rem;
}
.nav a:hover { background: var(--soft); color: var(--ink); }
.nav a[aria-current="page"] { color: var(--accent); }
.nav a.btn { color: #fff; margin-left: 6px; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line); border-radius: 6px;
  width: 42px; height: 42px; cursor: pointer; padding: 0;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 18px; height: 2px; background: var(--ink); margin: 0 auto; position: relative; content: "";
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav { position: absolute; top: 68px; left: 0; right: 0; background: var(--paper); border-bottom: 1px solid var(--line); display: none; }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; align-items: stretch; padding: 10px 20px 18px; gap: 2px; }
  .nav a { padding: 12px 10px; }
  .nav a.btn { margin: 8px 0 0; text-align: center; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; background: var(--scarlet); color: #fff;
  padding: 12px 22px; border-radius: 6px; text-decoration: none;
  font-weight: 600; font-size: .98rem; border: 2px solid var(--scarlet);
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--scarlet-dark); border-color: var(--scarlet-dark); color: #fff; }
.btn-outline { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-outline:hover { background: var(--ink); border-color: var(--ink); color: var(--on-ink); }
.btn-light { background: #fff; color: #121212; border-color: #fff; }
.btn-light:hover { background: transparent; color: #fff; border-color: #fff; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-soft { background: var(--soft); }
.section-dark { background: var(--band); color: #d8d8d8; }
.section-dark h2, .section-dark h3 { color: #fff; }

.eyebrow {
  display: inline-block; font-size: .78rem; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
}
.section-dark .eyebrow { color: #ff6b73; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 640px; }
.section-head { max-width: 700px; margin-bottom: 44px; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 88px; border-bottom: 1px solid var(--line); position: relative; overflow: hidden; }
.hero::after {
  content: "ΑΒΓ"; position: absolute; right: -20px; bottom: -70px;
  font-family: var(--serif); font-weight: 700; font-size: clamp(10rem, 26vw, 22rem);
  color: var(--scarlet); opacity: .06; line-height: 1; pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { max-width: 780px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lead { margin-bottom: 30px; }

.page-hero { padding: 72px 0 56px; border-bottom: 1px solid var(--line); background: var(--soft); }
.page-hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.1rem); }

/* ---------- Cards & grids ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px;
}
.card h3 { margin-bottom: .4em; }
.card p:last-child { margin-bottom: 0; }
.card .num {
  font-family: var(--serif); color: var(--accent); font-size: 1rem; font-weight: 700;
  display: block; margin-bottom: 10px; letter-spacing: .05em;
}

/* Meeting banner */
.meeting {
  display: grid; grid-template-columns: auto 1fr auto; gap: 26px; align-items: center;
  background: var(--surface); border: 1px solid var(--line); border-left: 5px solid var(--scarlet);
  border-radius: var(--radius); padding: 26px 30px; margin-top: -44px; position: relative; z-index: 2;
  box-shadow: 0 10px 30px rgba(0,0,0,.06);
}
.meeting .day {
  font-family: var(--serif); text-align: center; line-height: 1;
  border-right: 1px solid var(--line); padding-right: 26px;
}
.meeting .day strong { display: block; font-size: 2rem; color: var(--ink); }
.meeting .day span { font-size: .78rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }
.meeting h3 { margin: 0 0 4px; }
.meeting p { margin: 0; color: var(--muted); }
@media (max-width: 720px) {
  .meeting { grid-template-columns: 1fr; gap: 14px; margin-top: -30px; }
  .meeting .day { border-right: 0; padding-right: 0; text-align: left; }
}

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid #333; }
.stat { padding: 28px 22px 0 0; }
.stat strong { display: block; font-family: var(--serif); font-size: 2.4rem; color: #fff; line-height: 1.1; }
.stat span { font-size: .92rem; color: #b5b5b5; }
@media (max-width: 760px) { .stats { grid-template-columns: 1fr 1fr; row-gap: 10px; } }

/* Speakers */
.speaker { display: flex; flex-direction: column; gap: 6px; }
.speaker .org { font-size: .82rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.speaker h3 { margin: 0; }
.speaker p { color: var(--muted); margin: 0; }
.tag {
  align-self: flex-start; margin-top: 12px; font-size: .78rem; font-weight: 600;
  padding: 4px 10px; border-radius: 99px; background: var(--soft); color: var(--muted); border: 1px solid var(--line);
}
.tag.special { background: transparent; color: var(--accent); border-color: var(--accent); }
.tag.past { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }

/* Officers */
.officers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
@media (max-width: 960px) { .officers { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 680px) { .officers { grid-template-columns: repeat(2, 1fr); gap: 14px; } }
.officer { text-align: center; padding: 26px 16px; }
.avatar {
  width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 14px;
  background: var(--soft); border: 2px solid var(--line);
  display: grid; place-items: center; overflow: hidden;
  font-family: var(--serif); font-size: 1.6rem; font-weight: 600; color: var(--accent);
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.officer h3 { font-size: 1.08rem; margin: 0 0 2px; }
.officer p { font-size: .9rem; color: var(--muted); margin: 0; line-height: 1.4; }
.officer.lead-officer .avatar { background: var(--scarlet); color: #fff; border-color: var(--scarlet); }

/* Lists */
.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li { position: relative; padding: 12px 0 12px 34px; border-bottom: 1px solid var(--line); }
.checklist li:last-child { border-bottom: 0; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 17px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--scarlet) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.5l3 3 6-7' fill='none' stroke='white' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat;
}

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; }
.steps li { counter-increment: step; position: relative; padding-left: 58px; min-height: 40px; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 40px; height: 40px; border-radius: 50%; border: 2px solid var(--accent);
  color: var(--accent); font-family: var(--serif); font-weight: 700; display: grid; place-items: center;
}
.steps h3 { margin: 6px 0 4px; font-size: 1.1rem; }
.steps p { margin: 0; color: var(--muted); }

.links { list-style: none; margin: 0; padding: 0; }
.links li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.links li:last-child { border-bottom: 0; }
.links strong { display: block; color: var(--ink); }
.links span { color: var(--muted); font-size: .94rem; }

/* FAQ */
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary {
  cursor: pointer; list-style: none; padding: 18px 40px 18px 0; position: relative;
  font-weight: 600; color: var(--ink); font-size: 1.04rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 6px; top: 12px; font-size: 1.6rem; color: var(--accent); font-weight: 400;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--muted); padding-bottom: 10px; }

/* Split layout */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; gap: 32px; } }

.note {
  background: var(--soft); border-left: 4px solid var(--scarlet); padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0; font-size: .95rem;
}

/* CTA band */
.cta { background: var(--scarlet); color: #fff; padding: 64px 0; }
.cta .wrap { display: flex; justify-content: space-between; align-items: center; gap: 28px; flex-wrap: wrap; }
.cta h2 { color: #fff; margin: 0 0 6px; }
.cta p { margin: 0; color: #ffe1e3; }

/* ---------- Footer ---------- */
.site-footer { background: var(--band); color: #a9a9a9; padding: 56px 0 28px; font-size: .94rem; }
.site-footer a { color: #e8e8e8; text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }
.site-footer h4 {
  color: #fff; font-family: var(--sans); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; margin: 0 0 14px;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer .brand-logo { width: 52px; height: 52px; box-shadow: 0 0 0 2px rgba(255,255,255,.85); }
.site-footer .brand-text span { color: #9a9a9a; }
.footer-bottom { border-top: 1px solid #2c2c2c; margin-top: 40px; padding-top: 22px; font-size: .84rem; color: #808080; }

.speaker-list { list-style: none; margin: 4px 0 0; padding: 0; }
.speaker-list li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.speaker-list li:first-child { padding-top: 2px; }
.speaker-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.speaker-list h3 { font-size: 1.08rem; margin: 0 0 2px; }
.speaker-list p { font-size: .92rem; line-height: 1.45; }
.card .btn { margin-top: 4px; }

/* ---------- Dark mode switch (iOS-style) ---------- */
.theme-switch {
  position: relative; flex: none;
  width: 52px; height: 32px; padding: 0; border: 0; border-radius: 99px; cursor: pointer;
  background: var(--switch-off);
  transition: background-color .25s ease;
  -webkit-tap-highlight-color: transparent;
}
.theme-switch[aria-checked="true"] { background: var(--scarlet); }
.theme-switch:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.theme-switch .knob {
  position: absolute; top: 2px; left: 2px; width: 28px; height: 28px; border-radius: 50%;
  background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,.25), 0 0 1px rgba(0,0,0,.2);
  display: grid; place-items: center;
  transition: transform .28s cubic-bezier(.3,1.4,.5,1);
}
.theme-switch[aria-checked="true"] .knob { transform: translateX(20px); }
.theme-switch:active .knob { width: 32px; }
.theme-switch[aria-checked="true"]:active .knob { transform: translateX(16px); }
.theme-switch svg { width: 16px; height: 16px; position: absolute; transition: opacity .2s, transform .28s; }
.theme-switch .sun { color: #d48a00; }
.theme-switch .moon { color: var(--scarlet); opacity: 0; transform: rotate(-40deg); }
.theme-switch[aria-checked="true"] .sun { opacity: 0; transform: rotate(40deg); }
.theme-switch[aria-checked="true"] .moon { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .theme-switch, .theme-switch .knob, .theme-switch svg, body { transition: none; }
}