:root {
  --ink: #0c2b28;
  --ink-soft: #3d5450;
  --paper: #fbf9f5;
  --paper-2: #f2eee6;
  --card: #ffffff;
  --accent: #f4750c;      /* warm orange */
  --accent-2: #ffb454;    /* sunset gold */
  --ocean: #0f9b8e;       /* teal */
  --ocean-deep: #0b5f57;
  --line: rgba(12, 43, 40, 0.12);
  --shadow: 0 20px 45px -25px rgba(12, 43, 40, 0.45);
  --radius: 20px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: "Fraunces", Georgia, serif;
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

a { color: inherit; }

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

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.4) blur(10px);
  background: rgba(251, 249, 245, 0.82);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { text-decoration: none; display: grid; line-height: 1.1; }
.brand-mark {
  font-family: "Fraunces", serif;
  font-weight: 700;
  font-size: 1.15rem;
}
.brand-sub { font-size: 0.72rem; color: var(--ink-soft); letter-spacing: 0.04em; text-transform: uppercase; }

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 26px;
  margin: 0;
  padding: 0;
}
.nav-links a { text-decoration: none; font-weight: 500; font-size: 0.95rem; color: var(--ink-soft); transition: color .2s; }
.nav-links a:hover { color: var(--ink); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; transition: .25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  padding: 13px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, color .2s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn .arrow { display: inline-block; line-height: 1; transform: translateY(0.5px); }
.btn-small { padding: 9px 16px; font-size: 0.9rem; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 12px 24px -12px rgba(244, 117, 12, .8); }
.btn-primary:hover { background: #e2670a; }
.btn-secondary { background: var(--ocean); color: #fff; box-shadow: 0 12px 24px -12px rgba(15,155,142,.7); }
.btn-secondary:hover { background: #0d857a; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-link { padding: 13px 8px; color: var(--ocean-deep); text-decoration: underline; text-underline-offset: 3px; }
.btn-link:hover { color: var(--accent); }
.btn-disabled { background: rgba(244, 117, 12, .55); box-shadow: none; cursor: default; }
.btn-disabled:hover { transform: none; background: rgba(244, 117, 12, .55); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 9vw, 120px) 24px clamp(40px, 5vw, 64px);
}
.hero-glow {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 620px;
  background:
    radial-gradient(50% 60% at 20% 20%, rgba(255,180,84,.35), transparent 70%),
    radial-gradient(45% 55% at 80% 10%, rgba(244,117,12,.24), transparent 70%),
    radial-gradient(60% 60% at 60% 90%, rgba(15,155,142,.22), transparent 70%);
  filter: blur(10px);
  z-index: 0;
}
.skyline-band {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  color: var(--ocean-deep);
  opacity: 0.3;
  pointer-events: none;
  line-height: 0;
}
.skyline-band svg { width: 100%; height: auto; }
.skyline-compact { display: none; }
@media (max-width: 640px) {
  .skyline-full { display: none; }
  .skyline-compact { display: block; max-width: 420px; margin: 0 auto; }
}
.hero-inner { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; }
.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ocean-deep);
  background: rgba(15, 155, 142, .12);
  padding: 7px 14px;
  border-radius: 999px;
  margin: 0 0 22px;
}
.hero h1 { font-size: clamp(2.3rem, 6vw, 4.4rem); font-weight: 700; }
.lede {
  max-width: 640px;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  color: var(--ink-soft);
  margin: 24px 0 32px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin: 48px 0 0;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
}
.hero-facts li { display: grid; }
.hero-facts strong { font-family: "Fraunces", serif; font-size: 1.5rem; font-weight: 600; }
.hero-facts span { color: var(--ink-soft); font-size: 0.9rem; }

/* ---------- Sections ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(56px, 8vw, 100px) 24px; }
.section-head { max-width: 760px; margin-bottom: 40px; }
.kicker {
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 12px;
}
.section-head h2 { font-size: clamp(1.7rem, 4vw, 2.7rem); }
.prose { max-width: 720px; font-size: 1.1rem; color: var(--ink-soft); }
.prose p { margin: 0 0 18px; }
.prose strong { color: var(--ink); }

/* ---------- Audience cards ---------- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}
.card-submit { border-top: 5px solid var(--accent); }
.card-attend { border-top: 5px solid var(--ocean); }
.card-tag {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-soft); margin: 0 0 8px;
}
.card h3 { font-size: 1.8rem; margin-bottom: 14px; }
.card p { color: var(--ink-soft); margin: 0 0 16px; }
.card p strong { color: var(--ink); }
.ticks { list-style: none; padding: 0; margin: 4px 0 22px; display: grid; gap: 10px; }
.ticks li { position: relative; padding-left: 30px; color: var(--ink); }
.ticks li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  width: 20px; height: 20px; border-radius: 50%;
  background: rgba(244,117,12,.12); color: var(--accent);
  display: grid; place-items: center; font-size: 0.75rem; font-weight: 700;
}
.card-attend .ticks li::before { background: rgba(15,155,142,.12); color: var(--ocean); }
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.card-head .card-tag { margin: 0; }
.deadline-chip {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  border: 1.5px solid currentColor;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}
.card-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; margin-top: auto; }
.deadline-note { color: var(--ink-soft); font-size: 0.88rem; }

/* ---------- Speakers ---------- */
.speakers-note { margin: -16px 0 40px; }
.speaker-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.speaker {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow);
}
.speaker-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 18px;
  display: block;
}
.silhouette {
  background:
    radial-gradient(circle at 50% 32%, rgba(12,43,40,.28) 0 26%, transparent 27%),
    radial-gradient(circle at 50% 100%, rgba(12,43,40,.28) 0 45%, transparent 46%),
    linear-gradient(160deg, rgba(15,155,142,.18), rgba(244,117,12,.16));
}
.speaker-name { font-size: 1.15rem; margin: 0 0 4px; }
.speaker-affil { color: var(--ink-soft); font-size: 0.9rem; margin: 0 0 6px; }
.speaker-topic { color: var(--ocean-deep); font-size: 0.88rem; font-weight: 600; margin: 0; }
.speaker-placeholder { opacity: 0.75; }
.speaker-placeholder .speaker-name { color: var(--ink-soft); font-weight: 400; }

/* ---------- Timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; max-width: 780px; }
.tl-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  padding: 20px 0 20px 0;
  position: relative;
  border-left: 2px solid var(--line);
  padding-left: 28px;
  margin-left: 6px;
}
.tl-item::before {
  content: "";
  position: absolute; left: -8px; top: 26px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--paper);
}
.tl-break::before { background: var(--accent-2); }
.tl-end::before { background: var(--ocean); }
.tl-time { font-family: "Fraunces", serif; font-weight: 600; font-size: 1.15rem; }
.tl-body { display: grid; }
.tl-body strong { font-size: 1.05rem; }
.tl-body em { color: var(--ink-soft); font-style: normal; font-size: 0.9rem; }

/* ---------- Repo band ---------- */
.repo {
  background: var(--ink);
  color: #fff;
  max-width: none;
  margin-top: 20px;
}
.repo-inner { max-width: var(--maxw); margin: 0 auto; text-align: center; }
.repo h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); color: #fff; max-width: 780px; margin: 0 auto 18px; }
.repo p { color: rgba(255,255,255,.75); max-width: 560px; margin: 0 auto 30px; font-size: 1.1rem; }
.repo-cta { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }
.repo .btn-ghost { color: #fff; border-color: rgba(255,255,255,.35); }
.repo .btn-ghost:hover { border-color: #fff; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #fff;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 36px 24px 20px; }
.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px 64px;
  padding-bottom: 26px;
}
.footer-brand { max-width: 300px; }
.footer-brand .brand-mark { color: #fff; font-size: 1.1rem; margin: 0 0 6px; }
.footer-sub { color: rgba(255, 255, 255, 0.6); font-size: 0.88rem; margin: 0; line-height: 1.5; }
.footer-logo { height: 64px; width: auto; margin-top: 16px; filter: brightness(0) invert(1); opacity: 0.85; }
.footer-nav { display: flex; gap: 48px; flex-wrap: wrap; }
.footer-col { display: grid; gap: 7px; align-content: start; }
.footer-col-title {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent-2); margin: 0 0 3px;
}
.footer-col a,
.footer-col span {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}
.footer-col a {
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.4);
  text-underline-offset: 3px;
  transition: color .2s, text-decoration-color .2s;
}
.footer-col a:hover { color: #fff; text-decoration-color: var(--accent-2); }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 40px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-bottom p { margin: 0; color: rgba(255, 255, 255, 0.55); font-size: 0.82rem; }
.footer-tags { letter-spacing: 0.02em; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .cards { grid-template-columns: 1fr; }
  .speaker-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 100%; right: 0; left: 0;
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: var(--paper);
    padding: 0 24px;
    border-bottom: 0;
    max-height: 0; overflow: hidden;
    transition: max-height .3s ease, padding .3s ease;
  }
  .nav-links.open {
    max-height: 400px;
    padding: 12px 24px 20px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 24px -18px rgba(12, 43, 40, 0.4);
  }
  .nav-links a { display: block; width: 100%; padding: 10px 0; font-size: 1.05rem; }
}
@media (max-width: 520px) {
  .tl-item { grid-template-columns: 1fr; gap: 4px; }
  .hero-facts { gap: 28px; }
  .speaker-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}