:root {
  /* Surge palette: navy/teal bg, shark grey, cola + foam, electric blue */
  --navy-deep: #0a1628;
  --navy-mid: #122a45;
  --teal-glow: #1a9aab;
  --cyan-bright: #3dd5e8;
  --surge-blue: #2b8fd9;
  --surge-blue-bright: #5ec4ff;
  --shark-grey: #8f98a3;
  --cola: #4d2a1a;
  --cola-deep: #321a10;
  --foam: #e6d9c4;
  --tap-red: #c43636;
  --bg-deep: var(--navy-deep);
  --bg-panel: rgba(10, 22, 40, 0.82);
  --bubble-1: rgba(45, 213, 232, 0.22);
  --bubble-2: rgba(43, 143, 217, 0.28);
  --bubble-3: rgba(77, 42, 26, 0.35);
  --text: #f0f4f8;
  --muted: #9eb0c4;
  --accent: var(--surge-blue);
  --accent-2: var(--cyan-bright);
  --border: rgba(94, 196, 255, 0.16);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Fredoka", system-ui, sans-serif;
  color: var(--text);
  color-scheme: dark;
  background:
    radial-gradient(circle at 15% 20%, rgba(43, 143, 217, 0.18) 0%, transparent 28%),
    radial-gradient(circle at 85% 75%, rgba(26, 154, 171, 0.22) 0%, transparent 32%),
    linear-gradient(180deg, var(--navy-deep) 0%, var(--navy-mid) 42%, var(--teal-glow) 100%);
}

body {
  position: relative;
}

.bubble-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.35) 0 35%, transparent 36%),
    radial-gradient(circle, rgba(255, 255, 255, 0.2) 0 30%, transparent 31%),
    radial-gradient(circle, rgba(255, 255, 255, 0.15) 0 25%, transparent 26%);
  background-size: 18px 18px, 24px 24px, 12px 12px;
  background-position: 0 0, 12px 18px, 6px 9px;
  opacity: 0.12;
}

.bubble-layer::before,
.bubble-layer::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  filter: blur(40px);
  animation: float 12s ease-in-out infinite;
  opacity: 1;
}

.bubble-layer::before {
  width: 280px;
  height: 280px;
  top: 10%;
  left: -40px;
  background: var(--bubble-1);
}

.bubble-layer::after {
  width: 320px;
  height: 320px;
  bottom: 8%;
  right: -60px;
  background: var(--bubble-2);
  animation-delay: -4s;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-18px);
  }
}

.hidden {
  display: none !important;
}

.gate {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.gate-card,
.app {
  position: relative;
  z-index: 1;
}

.gate-card {
  width: min(420px, 100%);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background:
    radial-gradient(circle at 20% 15%, rgba(143, 152, 163, 0.12) 0%, transparent 22%),
    radial-gradient(circle at 78% 88%, rgba(77, 42, 26, 0.2) 0%, transparent 28%),
    var(--bg-panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.gate-card h1,
.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--foam);
  text-shadow:
    0 0 0 #0a1628,
    2px 2px 0 #0a1628,
    -1px -1px 0 #0a1628,
    1px -1px 0 #0a1628,
    -1px 1px 0 #0a1628;
  letter-spacing: 0.02em;
}

.gate-card p,
.subtitle {
  color: var(--muted);
}

.gate-card form {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

input,
select,
button {
  font: inherit;
}

input[type="text"],
input[type="password"],
select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background-color: var(--navy-mid);
  color: var(--text);
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%235ec4ff' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

select option {
  background-color: var(--navy-mid);
  color: var(--text);
}

select option:checked {
  background-color: var(--surge-blue);
  color: var(--foam);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--surge-blue-bright);
  cursor: pointer;
}

button,
.secondary,
.ghost-link {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

button {
  background: linear-gradient(180deg, var(--tap-red) 0%, #8f2222 100%);
  color: var(--foam);
  font-weight: 600;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 4px 14px rgba(0, 0, 0, 0.3);
}

button:hover {
  filter: brightness(1.08);
}

.secondary {
  border: 1px solid rgba(94, 196, 255, 0.25);
  background: linear-gradient(180deg, rgba(43, 143, 217, 0.35), rgba(18, 42, 69, 0.65));
  color: var(--foam);
}

.ghost-link {
  background: rgba(10, 22, 40, 0.45);
  color: var(--surge-blue-bright);
  border: 1px solid rgba(94, 196, 255, 0.35);
}

.error {
  color: #ff8aa5;
  margin: 12px 0 0;
}

.app {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  margin: 0 0 8px;
  color: var(--surge-blue-bright);
}

.subtitle {
  margin: 0;
  max-width: 38ch;
}

.panel {
  display: grid;
  gap: 18px;
  padding: 24px;
  border-radius: 28px;
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(230, 217, 196, 0.04) 0%, transparent 12%),
    radial-gradient(circle at 8% 12%, rgba(143, 152, 163, 0.1) 0%, transparent 18%),
    radial-gradient(circle at 92% 78%, rgba(77, 42, 26, 0.14) 0%, transparent 24%),
    var(--bg-panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.panel::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--cola) 15%,
    var(--foam) 50%,
    var(--cola) 85%,
    transparent
  );
  opacity: 0.55;
  pointer-events: none;
}

.field {
  display: grid;
  gap: 10px;
}

.field > label {
  font-weight: 600;
}

.affixed-input {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
}

.affixed-input input {
  flex: 1;
  border: 0;
  background: transparent;
  padding: 4px 0;
  min-width: 0;
}

.affix {
  color: var(--foam);
  font-weight: 600;
  white-space: nowrap;
  background: linear-gradient(180deg, var(--cola), var(--cola-deep));
  padding: 4px 10px;
  border-radius: 10px;
  border: 1px solid rgba(230, 217, 196, 0.2);
}

.affix-prefix::after {
  content: " ";
}

.affix-suffix::before {
  content: " ";
}

.slider-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
}

.slider-row label {
  grid-column: 1 / -1;
}

output,
.watch-value {
  min-width: 72px;
  text-align: right;
  font-weight: 700;
  color: var(--surge-blue-bright);
  text-shadow: 0 0 12px rgba(94, 196, 255, 0.35);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.checkbox-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--surge-blue-bright);
}

#nulge-slider-wrap {
  margin-top: 4px;
}

.status-bar {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

.watch-panel {
  padding: 18px;
}

.watch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.watch-card {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(77, 42, 26, 0.22) 0%, rgba(10, 22, 40, 0.5) 38%, rgba(10, 22, 40, 0.35) 100%);
  position: relative;
  overflow: hidden;
}

.watch-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 28%;
  background: linear-gradient(180deg, rgba(230, 217, 196, 0.12), transparent);
  pointer-events: none;
}

.watch-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.watch-value {
  margin: 0;
  font-size: 1.35rem;
  text-align: left;
}

.watch-delta {
  margin: 8px 0 0;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.watch-delta.flat {
  color: var(--muted);
  font-weight: 500;
}

.watch-delta.up {
  color: #7ee0a0;
}

.watch-delta.down {
  color: #ff9a7e;
}

.watch-hero {
  align-items: center;
}

@media (max-width: 720px) {
  .hero {
    flex-direction: column;
  }

  .slider-row {
    grid-template-columns: 1fr;
  }

  output {
    text-align: left;
  }
}