:root {
  /* Palette sampled directly from the event poster (light UI, vivid purple
     accent, Google-style four-color set for badges/blobs/icons). */
  --bg: #F7F7FA;
  --bg-raised: #FFFFFF;
  --bg-card: #FFFFFF;
  --border: #E3E1ED;
  --text: #16151F;
  --text-dim: #6E6B7C;

  --dd-purple: #7017F4;
  --dd-purple-dim: #EFE6FF;
  --dd-purple-deep: #5A11C4;

  --gcp-blue: #0074FB;
  --gcp-red: #FB5140;
  --gcp-yellow: #FEB302;
  --gcp-green: #53C764;

  /* Deeper variants of the vivid poster colors, used only where the color
     sits directly on the light background as small text — the bright
     versions above read fine as fills/badges/blobs but are too light for
     comfortable text contrast on their own. */
  --gcp-red-text: #D8342A;
  --gcp-yellow-text: #916300;
  --gcp-green-text: #2E9E48;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 14px;

  --shadow-card: 0 1px 2px rgba(22, 21, 31, 0.04), 0 6px 16px rgba(22, 21, 31, 0.06);
  --shadow-modal: 0 24px 60px rgba(22, 21, 31, 0.22);

  --scrim: rgba(20, 19, 28, 0.45);
  --scrim-welcome: rgba(20, 19, 28, 0.5);
  --welcome-grad-a: #FFFFFF;
  --welcome-grad-b: #F3ECFF;
  --orb-opacity: 0.22;
  --brand-logo-opacity: 0.10;
}

[data-theme="dark"] {
  --bg: #121017;
  --bg-raised: #1B1823;
  --bg-card: #211E2B;
  --border: #322E3D;
  --text: #F3F1F7;
  --text-dim: #9C97AC;

  --dd-purple: #8C5CF2;
  --dd-purple-dim: #3A2B63;
  --dd-purple-deep: #A47AF5;

  --gcp-blue: #4285F4;
  --gcp-red: #EA4335;
  --gcp-yellow: #FBBC05;
  --gcp-green: #34A853;

  /* On a dark background the vivid brand colors themselves already have
     enough contrast to use directly as text, so no separate deep variant
     is needed here the way the light theme needs one. */
  --gcp-red-text: #EA4335;
  --gcp-yellow-text: #FBBC05;
  --gcp-green-text: #34A853;

  --shadow-card: none;
  --shadow-modal: 0 24px 60px rgba(0, 0, 0, 0.55);

  --scrim: rgba(0, 0, 0, 0.6);
  --scrim-welcome: rgba(0, 0, 0, 0.68);
  --welcome-grad-a: #211E2B;
  --welcome-grad-b: #1B1823;
  --orb-opacity: 0.35;
  --brand-logo-opacity: 0.14;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- Parallax background ---------- */

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

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: var(--orb-opacity);
  will-change: transform;
}

.orb--purple {
  width: 420px;
  height: 420px;
  top: -120px;
  left: -80px;
  background: radial-gradient(circle, var(--dd-purple) 0%, transparent 70%);
}

.orb--blue {
  width: 360px;
  height: 360px;
  top: 30vh;
  right: -100px;
  background: radial-gradient(circle, var(--gcp-blue) 0%, transparent 70%);
}

.orb--green {
  width: 300px;
  height: 300px;
  bottom: -80px;
  left: 20vw;
  background: radial-gradient(circle, var(--gcp-green) 0%, transparent 70%);
  opacity: calc(var(--orb-opacity) * 0.8);
}

.brand-logo {
  position: absolute;
  height: auto;
  opacity: var(--brand-logo-opacity);
  filter: grayscale(0.25);
  will-change: transform;
  user-select: none;
  -webkit-user-drag: none;
}

.brand-logo--datadog {
  width: 240px;
  top: 4%;
  left: 3%;
}

.brand-logo--gcp {
  width: 280px;
  bottom: 6%;
  right: 4%;
}

@media (max-width: 720px) {
  .brand-logo--datadog { width: 150px; }
  .brand-logo--gcp { width: 170px; }
}

.topbar, .pulseline, .content, .modal {
  position: relative;
  z-index: 1;
}

/* ---------- Top bar ---------- */

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 20px;
  padding: 32px clamp(20px, 5vw, 64px) 20px;
}

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gcp-green-text);
  margin-bottom: 8px;
}

.topbar__event h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 34px);
  margin: 0;
  letter-spacing: -0.01em;
}

.topbar__event h1 .x {
  color: var(--dd-purple);
  font-weight: 500;
}

.live-clock {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.live-clock__dot {
  opacity: 0.5;
}

.live-clock__tz {
  font-size: 10px;
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.metric {
  display: flex;
  align-items: baseline;
  gap: 4px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  box-shadow: var(--shadow-card);
}

.metric__value {
  font-size: 22px;
  font-weight: 500;
  color: var(--gcp-green-text);
}

.metric__divider {
  color: var(--text-dim);
}

.metric__total {
  font-size: 16px;
  color: var(--text-dim);
}

.metric__label {
  margin-left: 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* ---------- Pulse divider (signature element) ---------- */

.pulseline {
  width: 100%;
  height: 24px;
  padding: 0 clamp(20px, 5vw, 64px);
  opacity: 0.6;
  will-change: transform;
}

.pulseline svg {
  width: 100%;
  height: 100%;
}

.pulseline path {
  fill: none;
  stroke: var(--dd-purple);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Buttons ---------- */

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  border-radius: 9px;
  padding: 10px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:active { transform: scale(0.97); }

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--dd-purple);
}

.btn--icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
}

.icon-moon {
  display: none;
}

[data-theme="dark"] .icon-sun {
  display: none;
}

[data-theme="dark"] .icon-moon {
  display: block;
}

.btn--danger {
  background: transparent;
  border-color: var(--gcp-red);
  color: var(--gcp-red-text);
}

.btn--danger:hover {
  background: var(--gcp-red);
  color: #fff;
}

.btn--attend {
  background: var(--dd-purple);
  color: #fff;
  border-color: var(--dd-purple);
}

.btn--attend:hover {
  background: var(--dd-purple-deep);
  border-color: var(--dd-purple-deep);
}

.btn--attend[disabled] {
  cursor: default;
  background: var(--gcp-green);
  border-color: var(--gcp-green);
  opacity: 0.95;
}

.btn--attend.btn--blocked[disabled] {
  background: transparent;
  border-color: var(--border);
  color: var(--text-dim);
  opacity: 1;
  cursor: not-allowed;
}

/* ---------- Content ---------- */

.content {
  padding: 8px clamp(20px, 5vw, 64px) 64px;
  max-width: 1080px;
  margin: 0 auto;
}

.toolbar {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 20px;
}

#searchInput {
  flex: 1 1 260px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 11px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  box-shadow: var(--shadow-card);
}

#searchInput:focus {
  outline: 2px solid var(--dd-purple);
  outline-offset: 1px;
}

#searchInput::placeholder { color: var(--text-dim); }

.toolbar__filters {
  display: flex;
  gap: 8px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
}

.chip:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--gcp-blue);
  outline-offset: 2px;
}

.chip--active {
  border-color: var(--dd-purple);
  color: var(--dd-purple-deep);
  background: var(--dd-purple-dim);
}

/* ---------- Banner / states ---------- */

.banner {
  border-radius: 9px;
  padding: 12px 16px;
  font-size: 13px;
  margin-bottom: 16px;
  border: 1px solid var(--gcp-red);
  color: var(--gcp-red-text);
  background: rgba(251, 81, 64, 0.08);
}

.banner--hidden { display: none; }

.loading, .empty {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 40px 0;
  text-align: center;
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.loading[hidden] {
  display: none;
}

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border);
  border-top-color: var(--dd-purple);
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- Attendee list ---------- */

.attendee-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.attendee {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  transition: border-color 0.15s ease;
  box-shadow: var(--shadow-card);
}

.attendee--enter {
  animation: attendee-in 0.28s ease backwards;
}

@keyframes attendee-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .attendee--enter { animation: none; }
}

.attendee--attended {
  border-color: rgba(83, 199, 100, 0.5);
}

.attendee__title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 4px;
}

.attendee__info h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid currentColor;
  line-height: 1.5;
}

.status-badge--approved { color: var(--gcp-green-text); }
.status-badge--rejected { color: var(--gcp-red-text); }
.status-badge--pending { color: var(--gcp-yellow-text); }
.status-badge--unknown { color: var(--text-dim); border-color: var(--border); }

.attendee__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  color: var(--text-dim);
  font-size: 13px;
}

.attendee__meta span {
  white-space: nowrap;
}

.attendee__meta .role-company {
  color: var(--gcp-blue);
}

.attendee__timestamp {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gcp-green-text);
  margin-top: 6px;
}

.attendee__action {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.link-btn {
  align-self: flex-start;
  margin-top: 8px;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--gcp-blue);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.link-btn:hover { color: var(--dd-purple); }

.link-btn--danger {
  color: var(--gcp-red-text);
  margin-top: 0;
}

.link-btn--danger:hover { color: #A81F13; }

/* ---------- Modal ---------- */

.modal {
  position: fixed;
  inset: 0;
  background: var(--scrim);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 10;
}

.modal[hidden] { display: none; }

.modal__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-modal);
}

.modal__card--details {
  max-width: 480px;
}

.modal__card h2 {
  font-family: var(--font-display);
  margin: 0 0 12px;
  font-size: 20px;
}

.modal__subtitle {
  margin: -8px 0 18px;
  color: var(--gcp-blue);
  font-size: 13px;
}

.modal__card p {
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.5;
}

.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.details-grid {
  display: grid;
  gap: 16px;
  margin: 0;
}

.details-grid dt {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.details-grid dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
}

/* ---------- Welcome screen ---------- */

.modal--welcome {
  background: var(--scrim-welcome);
}

.welcome-card {
  background: linear-gradient(165deg, var(--welcome-grad-a) 0%, var(--welcome-grad-b) 100%);
  border: 1px solid var(--dd-purple);
  border-radius: 20px;
  padding: 44px 36px;
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-modal);
  animation: welcome-in 0.32s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes welcome-in {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.welcome-card__badge {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--gcp-green);
  color: #fff;
  font-size: 26px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.welcome-card .eyebrow {
  text-align: center;
  margin-bottom: 6px;
}

.welcome-card h2 {
  font-family: var(--font-display);
  font-size: 26px;
  margin: 0 0 8px;
}

.welcome-card p {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0 0 26px;
}

.welcome-card .btn {
  width: 100%;
}

@media (max-width: 560px) {
  .attendee {
    grid-template-columns: 1fr;
  }
  .attendee__action {
    align-items: flex-start;
  }
}

/* ---------- Back to top ---------- */

.back-to-top {
  position: fixed;
  right: clamp(16px, 4vw, 32px);
  bottom: clamp(16px, 4vw, 32px);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--dd-purple);
  color: #fff;
  border: 1px solid var(--dd-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 20;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.15s ease;
  box-shadow: 0 8px 24px rgba(22, 21, 31, 0.28);
}

.back-to-top--visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--dd-purple-deep);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--gcp-blue);
  outline-offset: 2px;
}

/* ---------- Footer ---------- */

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 22px clamp(20px, 5vw, 64px) 32px;
  text-align: center;
}

.site-footer p {
  margin: 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
}