:root {
  --bg-deep: #0a1628;
  --bg-mid: #0d1f3c;
  --bg-card: #0f2847;
  --cyan: #008cff;
  --cyan-bright: #00a3ff;
  --text: #ffffff;
  --text-muted: #8eb4d9;
  --text-dim: #5a8ab5;
  --border: rgba(0, 140, 255, 0.2);
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --radius: 12px;
  --radius-lg: 16px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.5;
  background: linear-gradient(160deg, var(--bg-deep) 0%, var(--bg-mid) 50%, #0a1a30 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ── Background ── */

.page-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.page-bg__globe {
  position: absolute;
  top: -60px;
  right: -80px;
  width: 480px;
  height: 480px;
  opacity: 0.5;
}

.page-bg__globe circle,
.page-bg__globe ellipse {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 0.6;
  opacity: 0.4;
}

.page-bg__ripples {
  position: absolute;
  top: 120px;
  right: 80px;
  width: 400px;
  height: 400px;
}

.page-bg__ripples circle {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 0.8;
  opacity: 0.12;
}

.page-bg__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 140, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 140, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ── Layout ── */

.page-wrap {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
}

.page-main {
  min-width: 0;
}

/* ── Header / Hero ── */

.site-header {
  margin-bottom: 28px;
}

.site-header--centered {
  text-align: center;
}

.site-logo {
  height: 32px;
  width: auto;
  margin-bottom: 32px;
}

.hero-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-bright);
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(48px, 8vw, 72px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-bright);
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-intro {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 560px;
}

/* ── Event details ── */

.event-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 32px 0;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.event-detail {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.event-detail__icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  color: var(--cyan);
}

.event-detail__label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan-bright);
  margin-bottom: 4px;
}

.event-detail__value {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.event-detail__sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Mobile prompt CTA (hidden desktop) ── */

.register-prompt {
  display: none;
}

/* ── Speakers ── */

.section-heading {
  text-align: center;
  margin-bottom: 28px;
}

.section-heading__text {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text);
  padding: 0 20px;
}

.section-heading__line {
  display: flex;
  align-items: center;
  gap: 16px;
}

.section-heading__line::before,
.section-heading__line::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.speakers {
  margin-bottom: 36px;
}

.speakers__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.speaker-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.speaker-card__body {
  padding: 20px 12px;
  text-align: center;
  background: var(--bg-card);
}

.speaker-card__name {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
  line-height: 1.3;
}

.speaker-card__title {
  font-size: 9px;
  color: var(--cyan-bright);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 10px;
  line-height: 1.35;
}

.speaker-card__logo {
  height: 14px;
  width: auto;
  margin: 0 auto;
  opacity: 0.9;
}

.speakers__more {
  text-align: center;
  margin-top: 20px;
}

.speakers__more span {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
}

/* ── Features ── */

.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.feature {
  text-align: center;
}

.feature__icon-wrap {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(0, 140, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
}

.feature__icon {
  width: 26px;
  height: 26px;
}

.feature__title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.feature__desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Register sidebar (desktop) ── */

.register-sidebar {
  position: sticky;
  top: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}

.register-sidebar__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(0, 140, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
}

.register-sidebar__heading {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 6px;
}

.register-sidebar__sub {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan-bright);
  text-align: center;
  margin-bottom: 20px;
}

.register-sidebar__label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 8px;
}

.register-sidebar__hint {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.55;
  margin-bottom: 20px;
}

.register-sidebar__qr {
  width: 140px;
  height: 140px;
  margin: 0 auto 20px;
  padding: 8px;
  background: white;
  border-radius: 8px;
}

.register-sidebar__qr img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.register-btn {
  display: block;
  width: 100%;
  text-align: center;
  background: linear-gradient(180deg, var(--cyan-bright) 0%, var(--cyan) 100%);
  color: white;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 14px 20px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}

.register-btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

/* ── Footer ── */

.site-footer {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding-top: 32px;
  margin-top: 8px;
  border-top: 1px solid var(--border);
}

.footer-security {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.footer-security__icon {
  width: 32px;
  height: 32px;
  color: var(--cyan);
  flex-shrink: 0;
}

.footer-security__title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.footer-security__text {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.45;
}

.footer-tagline {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-align: center;
}

.footer-logos {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

.footer-logos__divider {
  width: 1px;
  height: 24px;
  background: var(--border);
}

.footer-logos img {
  height: 22px;
  width: auto;
}

.footer-logos img[alt="XRP"] {
  height: 26px;
  filter: brightness(1.6);
}

/* ── RSVP page ── */

.rsvp-page .page-wrap {
  max-width: 640px;
  padding-top: 48px;
  padding-bottom: 64px;
}

.rsvp-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
}

.rsvp-check {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: rgba(0, 140, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  color: var(--cyan-bright);
}

.rsvp-title {
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
}

.rsvp-sub {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.rsvp-sub .required {
  color: #f08080;
  font-weight: 600;
}

.google-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: white;
  border: 1px solid #747775;
  border-radius: 4px;
  padding: 10px 24px;
  min-width: 240px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  color: #1f1f1f;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.google-btn:hover {
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.google-btn__icon {
  width: 20px;
  height: 20px;
}

.rsvp-ref {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.rsvp-ref__label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.rsvp-ref__id {
  font-size: 13px;
  font-family: "SF Mono", Consolas, monospace;
  color: var(--cyan-bright);
  letter-spacing: 0.06em;
}

.rsvp-back {
  display: inline-block;
  margin-top: 24px;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── Responsive ── */

@media (max-width: 1024px) {
  .speakers__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-layout {
    grid-template-columns: 1fr 280px;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .page-wrap {
    padding: 20px 16px 28px;
    padding-bottom: calc(28px + env(safe-area-inset-bottom));
  }

  .page-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-bg__globe {
    width: 280px;
    height: 280px;
    top: -40px;
    right: -60px;
    opacity: 0.35;
  }

  .page-bg__ripples {
    width: 240px;
    height: 240px;
    top: 60px;
    right: -20px;
    opacity: 0.7;
  }

  .register-sidebar--desktop {
    display: none;
  }

  /* Hero */
  .site-header {
    margin-bottom: 20px;
  }

  .site-logo {
    height: 26px;
    margin-bottom: 20px;
  }

  .hero-eyebrow {
    font-size: 11px;
    letter-spacing: 0.1em;
    margin-bottom: 6px;
  }

  .hero-title {
    font-size: clamp(40px, 12vw, 52px);
    margin-bottom: 2px;
  }

  .hero-subtitle {
    font-size: clamp(15px, 4.5vw, 18px);
    letter-spacing: 0.1em;
    margin-bottom: 10px;
  }

  .hero-tagline {
    font-size: 11px;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
  }

  .hero-intro {
    font-size: 14px;
    line-height: 1.55;
  }

  /* Event details */
  .event-details {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 20px 0;
    padding: 16px 0;
  }

  .event-detail {
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    background: rgba(15, 40, 71, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }

  .event-detail__icon {
    width: 22px;
    height: 22px;
  }

  .event-detail__label {
    font-size: 9px;
    letter-spacing: 0.06em;
    margin-bottom: 2px;
  }

  .event-detail__value {
    font-size: 11px;
    letter-spacing: 0.02em;
    line-height: 1.35;
  }

  /* Mobile register prompt */
  .register-prompt {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
    text-align: center;
  }

  .register-prompt__lead {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 14px;
  }

  .register-btn {
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    padding: 12px 16px;
  }

  /* Speakers */
  .speakers {
    margin-bottom: 24px;
  }

  .section-heading {
    margin-bottom: 16px;
  }

  .section-heading__text {
    font-size: 11px;
    padding: 0 12px;
    letter-spacing: 0.1em;
  }

  .section-heading__line {
    gap: 10px;
  }

  .speakers__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .speaker-card__body {
    padding: 14px 8px;
  }

  .speaker-card__name {
    font-size: 10px;
    letter-spacing: 0.04em;
    margin-bottom: 3px;
  }

  .speaker-card__title {
    font-size: 9px;
    margin-bottom: 8px;
  }

  .speaker-card__logo {
    height: 12px;
  }

  .speakers__more {
    margin-top: 14px;
  }

  .speakers__more span {
    font-size: 9px;
    padding: 8px 14px;
    letter-spacing: 0.06em;
    line-height: 1.4;
  }

  /* Features */
  .features {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 20px;
  }

  .feature {
    display: grid;
    grid-template-columns: 44px 1fr;
    grid-template-rows: auto auto;
    column-gap: 12px;
    row-gap: 2px;
    text-align: left;
    align-items: start;
    padding: 14px;
    background: rgba(15, 40, 71, 0.5);
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }

  .feature__icon-wrap {
    width: 44px;
    height: 44px;
    margin: 0;
    grid-row: 1 / span 2;
    align-self: center;
  }

  .feature__icon {
    width: 22px;
    height: 22px;
  }

  .feature__title {
    font-size: 11px;
    letter-spacing: 0.05em;
    margin-bottom: 0;
    align-self: end;
  }

  .feature__desc {
    font-size: 12px;
    line-height: 1.45;
    grid-column: 2;
  }

  /* Bottom QR */
  .register-footer {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-top: 0;
    text-align: center;
  }

  .register-footer__label {
    font-size: 10px;
    letter-spacing: 0.08em;
    margin-bottom: 10px;
  }

  .register-footer .register-sidebar__qr {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    padding: 6px;
  }

  /* Footer */
  .site-footer {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 16px;
    padding-top: 20px;
    margin-top: 20px;
  }

  .footer-security {
    justify-content: center;
    text-align: left;
    max-width: 280px;
    margin: 0 auto;
  }

  .footer-security__icon {
    width: 28px;
    height: 28px;
  }

  .footer-tagline {
    font-size: 9px;
    letter-spacing: 0.08em;
    line-height: 1.5;
    padding: 0 8px;
  }

  .footer-logos {
    justify-content: center;
  }

  /* RSVP page */
  .rsvp-page .page-wrap {
    padding-top: 24px;
    padding-bottom: calc(32px + env(safe-area-inset-bottom));
  }

  .rsvp-page .site-header {
    text-align: center;
    margin-bottom: 20px;
  }

  .rsvp-page .site-logo {
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 0;
  }

  .rsvp-card {
    padding: 28px 20px;
    border-radius: var(--radius);
  }

  .rsvp-check {
    width: 40px;
    height: 40px;
    margin-bottom: 16px;
  }

  .rsvp-title {
    font-size: 24px;
    margin-bottom: 8px;
  }

  .rsvp-sub {
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.5;
  }

  .rsvp-ref {
    margin-top: 16px;
  }

  .rsvp-back {
    margin-top: 16px;
  }

  .google-btn {
    width: 100%;
    max-width: none;
    min-height: 48px;
    border-radius: 8px;
  }
}

@media (min-width: 769px) {
  .register-prompt,
  .register-footer {
    display: none !important;
  }
}