:root {
  color-scheme: light dark;
  --spc-font: "Century Gothic", "Avenir Next", Avenir, Montserrat, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --spc-bg: #f4f2ed;
  --spc-surface: #ffffff;
  --spc-surface-soft: rgba(255, 255, 255, .66);
  --spc-text: #171713;
  --spc-muted: #716d64;
  --spc-line: rgba(23, 23, 19, .12);
  --spc-line-strong: rgba(23, 23, 19, .22);
  --spc-accent: #7d753d;
  --spc-accent-soft: rgba(125, 117, 61, .12);
  --spc-danger: #b94242;
  --spc-focus: #817633;
  --spc-shadow: 0 22px 70px rgba(42, 37, 27, .08);
  --spc-radius-sm: 12px;
  --spc-radius: 20px;
  --spc-radius-lg: 28px;
  --spc-content: 1120px;
  --spc-ease: cubic-bezier(.2, .8, .2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --spc-bg: #111210;
    --spc-surface: #1a1b18;
    --spc-surface-soft: rgba(255, 255, 255, .045);
    --spc-text: #f0efe9;
    --spc-muted: #aaa69c;
    --spc-line: rgba(255, 255, 255, .11);
    --spc-line-strong: rgba(255, 255, 255, .2);
    --spc-accent: #c6bb70;
    --spc-accent-soft: rgba(198, 187, 112, .11);
    --spc-danger: #ee7979;
    --spc-focus: #d7c86c;
    --spc-shadow: 0 26px 80px rgba(0, 0, 0, .25);
  }
}

html[data-theme="light"] {
  color-scheme: light;
  --spc-bg: #f4f2ed;
  --spc-surface: #ffffff;
  --spc-surface-soft: rgba(255, 255, 255, .66);
  --spc-text: #171713;
  --spc-muted: #716d64;
  --spc-line: rgba(23, 23, 19, .12);
  --spc-line-strong: rgba(23, 23, 19, .22);
  --spc-accent: #7d753d;
  --spc-accent-soft: rgba(125, 117, 61, .12);
  --spc-danger: #b94242;
  --spc-focus: #817633;
  --spc-shadow: 0 22px 70px rgba(42, 37, 27, .08);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --spc-bg: #111210;
  --spc-surface: #1a1b18;
  --spc-surface-soft: rgba(255, 255, 255, .045);
  --spc-text: #f0efe9;
  --spc-muted: #aaa69c;
  --spc-line: rgba(255, 255, 255, .11);
  --spc-line-strong: rgba(255, 255, 255, .2);
  --spc-accent: #c6bb70;
  --spc-accent-soft: rgba(198, 187, 112, .11);
  --spc-danger: #ee7979;
  --spc-focus: #d7c86c;
  --spc-shadow: 0 26px 80px rgba(0, 0, 0, .25);
}

*, *::before, *::after { box-sizing: border-box; }
html { min-width: 320px; background: var(--spc-bg); scroll-behavior: smooth; }
body { margin: 0; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
img, svg { display: block; max-width: 100%; }

body.spc-app {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background:
    radial-gradient(circle at 15% 0%, color-mix(in srgb, var(--spc-accent) 7%, transparent), transparent 31rem),
    var(--spc-bg);
  color: var(--spc-text);
  font-family: var(--spc-font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .25s ease, color .25s ease;
}

.spc-skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--spc-text);
  color: var(--spc-bg);
  text-decoration: none;
}
.spc-skip-link:focus { transform: translateY(0); }

.spc-topbar {
  width: min(calc(100% - 40px), var(--spc-content));
  margin: 0 auto;
  padding: max(22px, env(safe-area-inset-top)) 0 18px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.spc-brand {
  width: clamp(175px, 20vw, 265px);
  text-decoration: none;
}
.spc-brand-title {
  display: block;
  margin-bottom: 7px;
  font-size: clamp(1.05rem, 1.5vw, 1.35rem);
  font-weight: 800;
  letter-spacing: -.045em;
}
.spc-brand img { width: 100%; height: auto; }

.spc-topbar-actions { display: flex; align-items: center; gap: 9px; }
.spc-icon-button,
.spc-theme-switch {
  min-height: 42px;
  border: 1px solid var(--spc-line);
  background: var(--spc-surface-soft);
  box-shadow: 0 10px 35px rgba(0, 0, 0, .04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.spc-icon-button {
  width: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  text-decoration: none;
}
.spc-icon-button svg { width: 18px; height: 18px; fill: currentColor; }
.spc-theme-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 13px;
  border-radius: 999px;
  cursor: pointer;
}
.spc-theme-icon { display: none; width: 17px; height: 17px; fill: currentColor; }
html[data-theme="auto"] .spc-theme-icon-auto,
html[data-theme="light"] .spc-theme-icon-light,
html[data-theme="dark"] .spc-theme-icon-dark { display: block; }
.spc-theme-switch span { font-size: .74rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.spc-icon-button,
.spc-theme-switch { transition: transform .2s var(--spc-ease), border-color .2s ease, background-color .2s ease; }
.spc-icon-button:hover,
.spc-theme-switch:hover { transform: translateY(-1px); border-color: var(--spc-line-strong); }

.spc-main {
  width: min(calc(100% - 40px), var(--spc-content));
  margin: 0 auto;
  padding: clamp(30px, 5vw, 70px) 0 clamp(70px, 9vw, 120px);
}

.spc-page-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: clamp(28px, 6vw, 76px);
  margin-bottom: clamp(32px, 5vw, 58px);
}
.spc-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--spc-muted);
  font-size: .8rem;
  font-weight: 700;
}
.spc-breadcrumbs a { text-decoration: none; }
.spc-breadcrumbs a:hover { color: var(--spc-text); }
.spc-eyebrow {
  margin: 0 0 10px;
  color: var(--spc-accent);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.spc-page-heading h1 {
  margin: 0;
  font-size: clamp(3.5rem, 8vw, 7.25rem);
  font-weight: 800;
  line-height: .88;
  letter-spacing: -.075em;
}
.spc-page-intro {
  max-width: 48rem;
  margin: 18px 0 0;
  color: var(--spc-muted);
  font-size: clamp(.9rem, 1.4vw, 1.05rem);
  font-weight: 650;
}

.spc-qr-card {
  display: grid;
  grid-template-columns: 78px minmax(0, 155px);
  align-items: center;
  gap: 16px;
  padding: 13px;
  border: 1px solid var(--spc-line);
  border-radius: var(--spc-radius);
  background: var(--spc-surface-soft);
  box-shadow: var(--spc-shadow);
  text-decoration: none;
}
.spc-qr-card img { width: 78px; height: 78px; padding: 5px; border-radius: 11px; background: #fff; }
.spc-qr-card span { display: flex; flex-direction: column; gap: 5px; }
.spc-qr-card strong { font-size: .82rem; }
.spc-qr-card small { color: var(--spc-muted); font-size: .72rem; line-height: 1.4; }

.spc-empty-state {
  padding: clamp(45px, 8vw, 90px) 24px;
  border: 1px solid var(--spc-line);
  border-radius: var(--spc-radius-lg);
  background: var(--spc-surface-soft);
  text-align: center;
}
.spc-empty-icon { width: 54px; height: 54px; margin: 0 auto 20px; color: var(--spc-muted); }
.spc-empty-icon svg { fill: currentColor; }
.spc-empty-state h2 { margin: 0 0 9px; font-size: clamp(1.35rem, 3vw, 2rem); }
.spc-empty-state p { max-width: 38rem; margin: 0 auto; color: var(--spc-muted); line-height: 1.65; }

.spc-footer {
  width: min(calc(100% - 40px), var(--spc-content));
  margin: 0 auto;
  padding: 22px 0 max(28px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--spc-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--spc-muted);
  font-size: .75rem;
  font-weight: 700;
}
.spc-footer > div,
.spc-footer nav { display: flex; align-items: center; gap: clamp(14px, 2vw, 26px); }
.spc-footer a { text-decoration: none; }
.spc-footer a:hover { color: var(--spc-text); }

.spc-icon-button:focus-visible,
.spc-theme-switch:focus-visible,
a:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--spc-focus) 65%, transparent);
  outline-offset: 4px;
}

@media (max-width: 760px) {
  .spc-topbar,
  .spc-main,
  .spc-footer { width: min(calc(100% - 30px), var(--spc-content)); }
  .spc-topbar { align-items: center; }
  .spc-brand { width: 165px; }
  .spc-brand-title { font-size: 1rem; }
  .spc-theme-switch { width: 42px; padding: 0; justify-content: center; }
  .spc-theme-switch span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .spc-main { padding-top: 36px; }
  .spc-page-heading { grid-template-columns: 1fr; align-items: start; }
  .spc-breadcrumbs { margin-bottom: 24px; }
  .spc-page-heading h1 { font-size: clamp(3.2rem, 17vw, 5.2rem); }
  .spc-qr-card { display: none; }
  .spc-footer { align-items: flex-start; flex-direction: column; }
  .spc-footer > div { width: 100%; justify-content: space-between; }
  .spc-footer > div:first-child { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 420px) {
  .spc-footer > div:last-child { align-items: flex-start; flex-direction: column; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

/* v2.1.1: shared dialog foundation */
.spc-qr-card {
  appearance: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.spc-qr-dialog {
  width: min(92vw, 560px);
  max-width: none;
  padding: 0;
  border: 0;
  border-radius: 28px;
  background: transparent;
  color: var(--spc-text);
}
.spc-qr-dialog::backdrop {
  background: rgba(8, 9, 8, .72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.spc-qr-dialog-panel {
  position: relative;
  padding: clamp(28px, 6vw, 48px);
  border: 1px solid var(--spc-line);
  border-radius: 28px;
  background: var(--spc-surface);
  box-shadow: 0 30px 100px rgba(0, 0, 0, .3);
  text-align: center;
}
.spc-qr-dialog-panel h2 {
  max-width: 430px;
  margin: 0 auto 24px;
  font-size: clamp(1.7rem, 5vw, 2.65rem);
  line-height: 1.05;
  letter-spacing: -.05em;
}
.spc-qr-dialog-panel > p:not(.spc-eyebrow) {
  max-width: 390px;
  margin: 22px auto 12px;
  color: var(--spc-muted);
  line-height: 1.6;
}
.spc-qr-dialog-code {
  width: min(100%, 360px);
  margin: 0 auto;
  padding: 18px;
  border-radius: 22px;
  background: #fff;
}
.spc-qr-dialog-code img { width: 100%; height: auto; }
.spc-dialog-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--spc-line);
  border-radius: 50%;
  background: var(--spc-surface-soft);
  color: inherit;
  cursor: pointer;
}
.spc-dialog-close svg { width: 19px; height: 19px; fill: currentColor; }
.spc-dialog-link { font-size: .82rem; font-weight: 800; text-underline-offset: 4px; }
body.has-open-dialog { overflow: hidden; }

/* v2.1.2: keep QR dialogs entirely inside the current viewport */
.spc-qr-dialog {
  width: min(92vw, 500px);
  max-height: calc(100dvh - 24px);
  overflow: hidden;
}
.spc-qr-dialog-panel {
  box-sizing: border-box;
  max-height: calc(100dvh - 24px);
  padding: clamp(22px, 4vw, 34px);
  overflow: hidden;
}
.spc-qr-dialog-panel h2 {
  margin-bottom: 16px;
  font-size: clamp(1.55rem, 4vw, 2.15rem);
}
.spc-qr-dialog-code {
  width: clamp(190px, 36dvh, 300px);
  padding: 13px;
  border-radius: 18px;
}
.spc-qr-dialog-panel > p:not(.spc-eyebrow) {
  margin: 14px auto 8px;
  line-height: 1.45;
}

@media (max-height: 700px) {
  .spc-qr-dialog-panel {
    padding: 20px 24px;
  }
  .spc-qr-dialog-panel .spc-eyebrow {
    margin-bottom: 7px;
  }
  .spc-qr-dialog-panel h2 {
    max-width: 360px;
    margin-bottom: 12px;
    font-size: clamp(1.35rem, 3.6vw, 1.75rem);
  }
  .spc-qr-dialog-code {
    width: clamp(170px, 32dvh, 230px);
    padding: 10px;
  }
  .spc-qr-dialog-panel > p:not(.spc-eyebrow) {
    margin-top: 10px;
    font-size: .88rem;
  }
  .spc-dialog-close {
    top: 10px;
    right: 10px;
    width: 38px;
    height: 38px;
  }
}

@media (max-height: 560px) {
  .spc-qr-dialog-panel > p:not(.spc-eyebrow) {
    display: none;
  }
  .spc-qr-dialog-code {
    width: clamp(150px, 30dvh, 190px);
  }
  .spc-dialog-link {
    display: inline-block;
    margin-top: 9px;
  }
}

/* v2.5.5: mobile viewport containment for rebuilt participant modules */
html,
body.spc-app {
  max-width: 100%;
  overflow-x: clip;
}

.spc-topbar,
.spc-main,
.spc-footer,
.spc-topbar-actions,
.spc-page-heading,
.spc-participant-nav {
  min-width: 0;
  max-width: 100%;
}

.spc-participant-nav {
  width: 100%;
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
}

.spc-participant-nav > * {
  min-width: 0;
}

@media (max-width: 560px) {
  .spc-topbar,
  .spc-main,
  .spc-footer {
    width: min(calc(100% - 26px), var(--spc-content));
  }

  .spc-topbar {
    gap: 12px;
  }

  .spc-brand {
    width: min(150px, calc(100vw - 126px));
    min-width: 0;
  }

  .spc-topbar-actions {
    flex: 0 0 auto;
    gap: 7px;
  }

  .spc-participant-nav {
    width: calc(100% + 26px);
    max-width: none;
    margin-left: -13px;
    margin-right: -13px;
    padding-left: 13px;
    padding-right: 13px;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
  }
}