/* Events pages. Tokens, base, buttons, nav and footer mirror the inline CSS of
   templates/landing_page.html so both share one identity without editing that file. */

/* ---------- Tokens ---------- */
:root {
  --bg-main: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-muted: #F1F5F9;
  --bg-accent: #EFF6FF;

  --color-primary: #2563EB;
  --color-secondary: #14B8A6;
  --color-accent: #22C55E;
  --brand-strong: #1D4ED8;
  --brand-soft: #DBEAFE;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;

  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --ring: rgba(37, 99, 235, 0.18);

  --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.04);
  --shadow-md: 0 4px 16px -4px rgba(2, 6, 23, 0.08), 0 2px 4px -2px rgba(2, 6, 23, 0.04);
  --shadow-lg: 0 10px 30px rgba(2, 6, 23, 0.08), 0 20px 40px -12px rgba(2, 6, 23, 0.12);

  --success: #16A34A;
  --warning: #F59E0B;
  --error: #DC2626;

  --grad-hero: radial-gradient(ellipse at 50% 0%, rgba(20, 184, 166, 0.08), transparent 55%),
               radial-gradient(ellipse at 80% 20%, rgba(37, 99, 235, 0.06), transparent 50%);
}
[data-theme="dark"] {
  --bg-main: #0B1220;
  --bg-surface: #111827;
  --bg-muted: #1F2937;
  --bg-accent: #172554;

  --color-primary: #3B82F6;
  --color-secondary: #2DD4BF;
  --color-accent: #22C55E;
  --brand-strong: #60A5FA;
  --brand-soft: rgba(59, 130, 246, 0.15);

  --text-primary: #E5E7EB;
  --text-secondary: #94A3B8;
  --text-muted: #94A3B8;

  --border: rgba(148, 163, 184, 0.15);
  --border-strong: rgba(148, 163, 184, 0.3);
  --ring: rgba(59, 130, 246, 0.25);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px -4px rgba(0, 0, 0, 0.5), 0 2px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6), 0 24px 48px -12px rgba(0, 0, 0, 0.6);

  --success: #22C55E;
  --warning: #FBBF24;
  --error: #F87171;

  --grad-hero: radial-gradient(ellipse at 50% 0%, rgba(45, 212, 191, 0.09), transparent 55%),
               radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.06), transparent 50%);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[hidden] { display: none !important; }
body {
  margin: 0;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-feature-settings: "cv11","ss01","ss03";
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color .3s ease, color .3s ease;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
::selection { background: var(--ring); color: var(--text-primary); }

.container { max-width: 1280px; margin: 0 auto; padding: 0 28px; }
.eyebrow {
  display: block;
  font-size: 13px; font-weight: 600; letter-spacing: 0.01em;
  color: var(--color-primary);
}
.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  padding: 10px 14px; border-radius: 8px;
  background: var(--color-primary); color: #fff; font-size: 14px; font-weight: 600;
}
.skip-link:focus { top: 12px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 10px;
  font-size: 14px; font-weight: 600; letter-spacing: -0.005em;
  transition: all .2s ease-out; white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary); color: white;
  box-shadow: 0 1px 0 rgba(255,255,255,.15) inset, 0 8px 20px -8px var(--color-primary);
}
.btn-primary:hover { background: var(--brand-strong); transform: translateY(-1px); box-shadow: 0 1px 0 rgba(255,255,255,.15) inset, 0 12px 28px -8px var(--color-primary); }
.btn-ghost { color: var(--text-primary); border: 1px solid var(--border); background: var(--bg-surface); }
.btn-ghost:hover { border-color: var(--border-strong); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn svg { transition: transform .2s ease-out; }
.btn:hover svg.arr { transform: translateX(2px); }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 6px;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}
.nav::before {
  content: ''; position: absolute; inset: 0; z-index: -1;
  backdrop-filter: saturate(180%) blur(22px);
  -webkit-backdrop-filter: saturate(180%) blur(22px);
  background: color-mix(in srgb, var(--bg-main) 70%, transparent);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.35);
}
[data-theme="dark"] .nav::before { box-shadow: inset 0 1px 0 rgba(255,255,255,.08); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 0; font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.logo-img { height: 36px; width: auto; max-width: 160px; display: block; object-fit: contain; }
footer .logo-img { height: 46px; max-width: 210px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 14px; color: var(--text-secondary); font-weight: 500; transition: color .2s ease-out; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text-primary); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-actions .btn {
  padding: 8px 16px; font-size: 13px; border-radius: 999px;
  box-shadow: 0 1px 0 rgba(255,255,255,.25) inset, 0 4px 12px -6px var(--color-primary);
}
.nav-actions .btn:hover { transform: none; box-shadow: 0 1px 0 rgba(255,255,255,.15) inset, 0 6px 16px -6px var(--color-primary); }
.nav-actions .btn svg.arr { width: 12px; height: 12px; }
.theme-toggle, .nav-toggle {
  width: 38px; height: 38px; align-items: center; justify-content: center;
  border-radius: 999px; border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--bg-surface) 55%, transparent);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.35);
  transition: all .2s ease-out;
}
.theme-toggle { display: inline-flex; }
.nav-toggle { display: none; }
[data-theme="dark"] .theme-toggle, [data-theme="dark"] .nav-toggle { box-shadow: inset 0 1px 0 rgba(255,255,255,.1); }
.theme-toggle:hover, .nav-toggle:hover { border-color: var(--border-strong); }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }
.nav-toggle .icon-close { display: none; }
.nav.menu-open .nav-toggle .icon-close { display: block; }
.nav.menu-open .nav-toggle .icon-menu { display: none; }
.nav-links .nav-links-cta { display: none; }
@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .nav-actions .btn { display: none; }
  .nav-links .nav-links-cta {
    display: block; margin: 8px 0 2px; padding: 12px 16px; text-align: center;
    border-radius: 999px; background: var(--color-primary); color: #fff; font-weight: 600;
  }
  .nav-links .nav-links-cta:hover { background: var(--brand-strong); color: #fff; }
  .nav-links {
    display: none; position: absolute; top: calc(100% + 10px); left: 16px; right: 16px;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 20px; overflow: hidden;
    box-shadow: var(--shadow-lg);
    padding: 8px;
  }
  .nav.menu-open .nav-links { display: flex; }
  .nav-links a { padding: 13px 18px; font-size: 15px; border-radius: 14px; color: var(--text-primary); }
  .nav-links a + a:not(.nav-links-cta) { border-top: 1px solid color-mix(in srgb, var(--border) 45%, transparent); }
  .nav-links a:hover { background: var(--bg-muted); }
}

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--border); padding: 56px 0 32px; background: var(--bg-main); }
.foot-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 48px; }
@media (max-width: 780px) { .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
.foot-brand .logo { margin-bottom: 16px; }
.foot-brand p { color: var(--text-secondary); font-size: 14px; max-width: 320px; margin: 0 0 16px; }
.foot-brand p.foot-lab { color: var(--text-muted); font-size: 13px; margin: 0; }
.foot-brand p.foot-lab strong { color: var(--text-secondary); font-weight: 600; }
.foot h5 { font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--text-muted); margin: 0 0 16px; }
.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.foot a { font-size: 14px; color: var(--text-secondary); transition: color .2s ease-out; }
.foot a:hover { color: var(--text-primary); }
.foot-disclosure {
  margin-top: 40px; padding: 18px 22px; background: var(--bg-muted); border: 1px solid var(--border);
  border-radius: 12px; font-size: 12px; color: var(--text-secondary); line-height: 1.65;
}
.foot-disclosure strong { color: var(--text-primary); font-weight: 600; }
.foot-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; font-size: 12.5px; color: var(--text-muted); }

/* ---------- Event pages ---------- */
.ev-main { padding-bottom: 88px; }

.ev-hero { padding: 56px 0 40px; background: var(--grad-hero); border-bottom: 1px solid var(--border); }
.ev-hero h1 {
  font-size: clamp(30px, 4.2vw, 48px); line-height: 1.08; letter-spacing: -0.025em; font-weight: 700;
  margin: 10px 0 20px; max-width: 920px; text-wrap: balance;
}
.ev-hero-lead { color: var(--text-secondary); font-size: clamp(16px, 1.3vw, 18px); line-height: 1.6; max-width: 640px; margin: 0; }
.ev-meta { display: flex; flex-wrap: wrap; gap: 10px 28px; list-style: none; padding: 0; margin: 0; color: var(--text-secondary); font-size: 15px; }
.ev-meta li { display: flex; align-items: center; gap: 8px; }
.ev-meta svg { color: var(--color-primary); flex: none; }
.ev-cosponsor { margin: 14px 0 0; color: var(--text-secondary); font-size: 15px; }
.ev-cosponsor strong { color: var(--text-primary); font-weight: 600; }
.ev-cosponsor a { display: inline-flex; align-items: center; gap: 5px; }
.ev-cosponsor a:hover strong, .ev-cosponsor a svg { color: var(--color-primary); }
.ev-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.ev-jump { display: none; }

.ev-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; padding-top: 40px; }
@media (min-width: 960px) {
  .ev-layout { grid-template-columns: minmax(0, 1.45fr) minmax(380px, 1fr); gap: 56px; align-items: start; }
  .ev-aside { position: sticky; top: 88px; max-height: calc(100vh - 108px); overflow-y: auto; border-radius: 16px; }
}
@media (max-width: 959px) {
  .ev-jump { display: inline-flex; }
  .ev-aside { scroll-margin-top: 84px; }
}

.ev-section { padding-bottom: 36px; }
.ev-section + .ev-section { border-top: 1px solid var(--border); padding-top: 36px; }
.ev-section h2 { font-size: 22px; line-height: 1.25; letter-spacing: -0.015em; font-weight: 700; margin: 0 0 14px; }
.ev-section p { color: var(--text-secondary); font-size: 15.5px; line-height: 1.7; margin: 0 0 14px; max-width: 72ch; }
.ev-section p:last-child { margin-bottom: 0; }
.ev-section strong { color: var(--text-primary); font-weight: 600; }
.ev-audience { font-size: 17px !important; color: var(--text-primary) !important; }
.ev-link { color: var(--color-primary); font-weight: 500; text-decoration: underline; text-underline-offset: 3px; }
.ev-link:hover { color: var(--brand-strong); }

.ev-objectives { margin: 0; padding-left: 22px; display: grid; gap: 10px; color: var(--text-secondary); font-size: 15.5px; line-height: 1.65; max-width: 72ch; }
.ev-objectives li::marker { color: var(--color-primary); font-weight: 600; }

.ev-table-wrap { border: 1px solid var(--border); border-radius: 16px; overflow: hidden; background: var(--bg-surface); margin-bottom: 24px; }
.ev-table { width: 100%; border-collapse: collapse; }
.ev-table th, .ev-table td { padding: 13px 18px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.ev-table thead th { font-size: 12px; color: var(--text-muted); font-weight: 600; letter-spacing: .06em; text-transform: uppercase; background: var(--bg-muted); }
.ev-table tbody tr:last-child td { border-bottom: none; }
.ev-table td.ev-time { white-space: nowrap; color: var(--text-secondary); font-variant-numeric: tabular-nums; }
.ev-table td.ev-topic { color: var(--text-primary); font-weight: 500; }
.ev-table td.ev-faculty { color: var(--text-secondary); }
@media (max-width: 640px) {
  .ev-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .ev-table, .ev-table tbody, .ev-table tr, .ev-table td { display: block; }
  .ev-table tr { padding: 12px 16px; border-bottom: 1px solid var(--border); }
  .ev-table tbody tr:last-child { border-bottom: none; }
  .ev-table td { padding: 2px 0; border: 0; }
}

.ev-reading { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.ev-reading li { color: var(--text-secondary); font-size: 15px; line-height: 1.65; max-width: 72ch; }
.ev-callout { padding: 20px 22px; background: var(--bg-muted); border: 1px solid var(--border); border-radius: 12px; }
.ev-callout p { font-size: 14.5px; }

.ev-faq { margin: 0; display: grid; gap: 18px; }
.ev-faq dt { font-weight: 600; font-size: 15.5px; color: var(--text-primary); }
.ev-faq dd { margin: 6px 0 0; color: var(--text-secondary); font-size: 15px; line-height: 1.65; max-width: 72ch; }

/* RSVP card + form */
.ev-card { background: var(--bg-surface); border: 1px solid var(--border); border-radius: 16px; padding: 26px; box-shadow: var(--shadow-md); }
.ev-card h2 { font-size: 20px; line-height: 1.25; letter-spacing: -0.01em; font-weight: 700; margin: 0 0 4px; }
.ev-card-sub { color: var(--text-secondary); font-size: 13.5px; margin: 0 0 20px; }
.ev-field { margin-bottom: 14px; min-width: 0; }
.ev-field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.ev-optional { font-weight: 400; color: var(--text-muted); }
.ev-field input, .ev-field select, .ev-field textarea {
  width: 100%; padding: 11px 12px; border: 1px solid var(--border-strong); border-radius: 10px;
  font: inherit; font-size: 14px; background: var(--bg-surface); color: var(--text-primary);
  transition: border-color .15s ease-out, box-shadow .15s ease-out;
}
.ev-field textarea { resize: vertical; min-height: 64px; }
.ev-field input:focus, .ev-field select:focus, .ev-field textarea:focus {
  outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--ring);
}
.ev-field.has-error input, .ev-field.has-error select, .ev-field.has-error textarea { border-color: var(--error); }
.ev-help { color: var(--text-secondary); font-size: 12.5px; margin: 6px 0 0; }
.ev-error { color: var(--error); font-size: 13px; font-weight: 500; margin: 6px 0 0; }
.ev-row { display: grid; gap: 12px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ev-row-3 { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.2fr) minmax(0, 0.9fr); }
@media (max-width: 480px) { .ev-row, .ev-row-3 { grid-template-columns: minmax(0, 1fr); gap: 0; } }
.ev-form-body { border: 0; padding: 0; margin: 0; min-width: 0; }
/* Closed (event has started): the form stays on the page, greyed out and disabled. */
.ev-card.is-closed .ev-form-body { opacity: .55; }
.ev-card.is-closed .ev-form-body input,
.ev-card.is-closed .ev-form-body select,
.ev-card.is-closed .ev-form-body textarea,
.ev-card.is-closed .ev-check { cursor: not-allowed; }
.ev-card.is-closed .ev-form-body input,
.ev-card.is-closed .ev-form-body select,
.ev-card.is-closed .ev-form-body textarea { background: var(--bg-muted); }
.ev-card.is-closed .ev-submit { background: var(--text-muted); box-shadow: none; cursor: not-allowed; transform: none; }
.ev-fieldset { border: 0; padding: 0; margin: 4px 0 0; min-width: 0; }
.ev-fieldset legend { font-size: 13px; font-weight: 600; padding: 0; margin-bottom: 10px; }
/* The legend already says the whole group is optional. */
.ev-fieldset .ev-field .ev-optional { display: none; }
.ev-fieldset .ev-field label { font-weight: 500; color: var(--text-secondary); }
.ev-check { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; color: var(--text-secondary); line-height: 1.5; cursor: pointer; }
.ev-check input { width: 18px; height: 18px; margin: 1px 0 0; flex: none; accent-color: var(--color-primary); }
.ev-check input:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.ev-check-wrap { margin-bottom: 12px; }
.ev-submit { width: 100%; justify-content: center; padding: 13px 18px; font-size: 15px; margin-top: 8px; }
.ev-fine { font-size: 12px; color: var(--text-muted); margin: 12px 0 0; }
.ev-honeypot { position: absolute; left: -9999px; }
.ev-alert { padding: 12px 14px; border-radius: 10px; font-size: 14px; margin: 0 0 16px; border: 1px solid transparent; }
.ev-alert-error { background: color-mix(in srgb, var(--error) 9%, transparent); border-color: color-mix(in srgb, var(--error) 35%, transparent); color: var(--error); font-weight: 500; }
.ev-alert-info { background: var(--bg-muted); border-color: var(--border); color: var(--text-secondary); }
.ev-messages { padding-top: 20px; }

/* List page */
.ev-list-grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); padding-top: 40px; }
.ev-event-card { display: flex; flex-direction: column; gap: 14px; transition: transform .25s ease-out, box-shadow .25s ease-out, border-color .25s ease-out; }
.ev-event-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--border-strong); }
.ev-event-card h2 { font-size: 21px; margin: 0; }
.ev-event-card p { color: var(--text-secondary); font-size: 14.5px; line-height: 1.6; margin: 0; }
.ev-event-card .ev-meta { flex-direction: column; gap: 8px; font-size: 14px; }
.ev-event-card .btn { align-self: flex-start; margin-top: 4px; }
.ev-empty { margin-top: 40px; padding: 40px 28px; text-align: center; color: var(--text-secondary); background: var(--bg-surface); border: 1px dashed var(--border-strong); border-radius: 16px; }

/* Thank-you and feedback pages */
.ev-panel { max-width: 640px; margin: 64px auto 0; text-align: center; padding: 40px 32px; }
.ev-panel h1 { font-size: clamp(26px, 3.4vw, 34px); line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; margin: 18px 0 12px; }
.ev-panel p { color: var(--text-secondary); font-size: 15.5px; line-height: 1.7; margin: 0 0 12px; }
.ev-panel .ev-meta { justify-content: center; margin: 22px 0; }
.ev-panel-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 26px; }
.ev-badge { width: 56px; height: 56px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; background: color-mix(in srgb, var(--success) 14%, transparent); color: var(--success); }
.ev-badge-info { background: var(--brand-soft); color: var(--color-primary); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}