:root {
  --bg-1: #eef3ef;
  --bg-2: #e3ebe5;
  --surface: #ffffff;
  --text: #131a16;
  --muted: #6b756e;
  --border: #d6dfd8;
  --border-strong: #b8c5bc;
  --accent: #1f6f5c;
  --accent-hover: #154d40;
  --accent-soft: #e7f2ee;
  --warning-bg: #fff6d6;
  --warning-border: #e8d77c;
  --warning-text: #6b4f0a;

  --base-a: #e64545;
  --base-t: #4a8cef;
  --base-g: #22a06b;
  --base-c: #f5b423;

  --shadow-sm: 0 1px 2px rgba(15, 30, 25, 0.06);
  --shadow-md: 0 10px 30px -12px rgba(15, 30, 25, 0.18), 0 2px 6px rgba(15, 30, 25, 0.05);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(34, 160, 107, 0.10), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(74, 140, 239, 0.08), transparent 60%),
    linear-gradient(180deg, var(--bg-1), var(--bg-2));
  background-attachment: fixed;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 3.5rem 1.25rem 4rem;
}

/* ----- Header ----- */

header {
  text-align: center;
  margin-bottom: 0.5rem;
}

header h1 {
  margin: 0 0 0.35rem;
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #154d40 0%, #1f6f5c 50%, #22a06b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

/* ----- DNA helix banner ----- */

.helix {
  position: relative;
  height: 84px;
  margin: 1.5rem 0 1.75rem;
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

.helix-track {
  position: relative;
  display: flex;
  width: 200%;
  animation: helix-pan 14s linear infinite;
}

.helix-track svg {
  display: block;
  height: 84px;
  width: 50%;
  flex: 0 0 50%;
}

.helix-strand {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  opacity: 0.9;
}

.helix-strand.back {
  stroke: var(--border-strong);
  opacity: 0.7;
}

.helix-rung {
  stroke-width: 2.5;
  stroke-linecap: round;
  opacity: 0.85;
}

.warning-lane {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.warning-rail {
  position: absolute;
  top: var(--top, 0);
  left: 0;
  width: 100%;
  height: 22px;
  pointer-events: none;
  animation: warning-traverse 14s linear infinite;
  animation-delay: var(--delay, 0s);
}

.warning-icon {
  position: absolute;
  right: -11px;
  top: 0;
  width: 22px;
  height: 22px;
  font-size: 18px;
  line-height: 22px;
  text-align: center;
  transform: scale(0);
  opacity: 0;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.25));
  pointer-events: none;
  user-select: none;
  animation: warning-pop 14s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes helix-pan {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(-50%, 0, 0); }
}

@keyframes warning-traverse {
  from { transform: translateX(0); }
  to   { transform: translateX(-100%); }
}

@keyframes warning-pop {
  0%, 100% { transform: scale(0);   opacity: 0; }
  10%      { transform: scale(1.3); opacity: 1; }
  20%, 80% { transform: scale(1);   opacity: 1; }
  90%      { transform: scale(0);   opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .helix-track,
  .warning-rail,
  .warning-icon { animation: none; }
}

/* ----- Form card ----- */

form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
  box-shadow: var(--shadow-md);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

label {
  font-weight: 600;
  font-size: 0.95rem;
}

select,
textarea,
input[type="email"] {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  box-shadow: var(--shadow-sm);
}

select:hover,
textarea:hover,
input[type="email"]:hover {
  border-color: var(--border-strong);
}

select:focus,
textarea:focus,
input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 111, 92, 0.18);
}

.hint {
  display: block;
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

textarea {
  resize: vertical;
  min-height: 7.5rem;
}

/* ----- Submit button ----- */

.submit-btn {
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  cursor: pointer;
  background: linear-gradient(180deg, #28876f 0%, var(--accent) 60%, var(--accent-hover) 100%);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 -2px 0 rgba(0, 0, 0, 0.18) inset,
    0 6px 14px -6px rgba(31, 111, 92, 0.55);
  transition: transform 0.08s ease, box-shadow 0.15s ease, filter 0.15s ease;
}

.submit-btn:hover {
  filter: brightness(1.05);
}

.submit-btn:active {
  transform: translateY(1px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.15) inset,
    0 -1px 0 rgba(0, 0, 0, 0.18) inset,
    0 3px 8px -4px rgba(31, 111, 92, 0.55);
}

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  filter: grayscale(0.2);
}

/* ----- Status text ----- */

.status {
  margin: 0;
  min-height: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.status.success { color: var(--accent); font-weight: 600; }
.status.error   { color: #a83232; font-weight: 600; }

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

footer {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.disclaimer {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  margin: 0;
  font-size: 0.9rem;
}

.terms {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ----- Honeypot ----- */

.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ----- Achievement banner ----- */

.achievement {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  width: 340px;
  max-width: calc(100vw - 3rem);
  padding: 0.85rem 1rem;
  background: linear-gradient(135deg, #1a1f1c 0%, #2a3530 100%);
  color: #f5f5f0;
  border-radius: 12px;
  border: 1px solid rgba(245, 180, 35, 0.4);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.4),
    0 20px 40px -12px rgba(0, 0, 0, 0.5),
    0 0 30px rgba(245, 180, 35, 0.15);
  transform: translateX(calc(100% + 2rem));
  opacity: 0;
  pointer-events: none;
}

.achievement::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 12px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(245, 180, 35, 0.6), rgba(245, 180, 35, 0) 50%, rgba(245, 180, 35, 0.4));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

.achievement.show {
  animation: achievement-pop 4.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes achievement-pop {
  0%   { transform: translateX(calc(100% + 2rem)); opacity: 0; }
  8%   { transform: translateX(-6%); opacity: 1; }
  14%  { transform: translateX(2%); opacity: 1; }
  18%  { transform: translateX(0); opacity: 1; }
  88%  { transform: translateX(0); opacity: 1; }
  100% { transform: translateX(calc(100% + 2rem)); opacity: 0; }
}

.achievement-icon {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: radial-gradient(circle at 30% 30%, #ffdd6e, #f5b423 55%, #b87a06 100%);
  display: grid;
  place-items: center;
  font-size: 1.7rem;
  box-shadow:
    0 0 0 2px rgba(245, 180, 35, 0.3),
    0 0 18px rgba(245, 180, 35, 0.5);
  animation: icon-shine 1.6s ease-in-out 0.3s infinite alternate;
}

@keyframes icon-shine {
  from { box-shadow: 0 0 0 2px rgba(245, 180, 35, 0.3), 0 0 12px rgba(245, 180, 35, 0.4); }
  to   { box-shadow: 0 0 0 2px rgba(245, 180, 35, 0.55), 0 0 28px rgba(245, 180, 35, 0.75); }
}

.achievement-text { flex: 1 1 auto; min-width: 0; }

.achievement-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #f5b423;
}

.achievement-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.achievement-xp {
  flex: 0 0 auto;
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffdd6e;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: rgba(245, 180, 35, 0.12);
  border: 1px solid rgba(245, 180, 35, 0.35);
}

/* ----- Confetti canvas ----- */

#confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
}