:root {
  --ink: #14201c;
  --muted: #4a5c54;
  --line: rgba(20, 32, 28, 0.12);
  --panel: rgba(255, 252, 247, 0.88);
  --accent: #0f6b4c;
  --accent-deep: #0a4d37;
  --warn: #9a3412;
  --ok: #0f6b4c;
  --shadow: 0 24px 60px rgba(12, 28, 22, 0.18);
  --radius: 18px;
  --font: "DM Sans", sans-serif;
  --display: "Instrument Serif", Georgia, serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: #1a2e26;
  overflow-x: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 15% 20%, rgba(56, 140, 110, 0.45), transparent 55%),
    radial-gradient(ellipse 70% 50% at 85% 75%, rgba(180, 140, 70, 0.28), transparent 50%),
    linear-gradient(160deg, #1a2e26 0%, #243d34 42%, #1e332b 100%);
  z-index: 0;
}

.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 11px,
      rgba(255, 255, 255, 0.015) 11px,
      rgba(255, 255, 255, 0.015) 12px
    );
  pointer-events: none;
}

.stage {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.panel {
  width: min(100%, 420px);
  padding: 2rem 1.75rem 1.75rem;
  background: var(--panel);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: rise 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.85rem, 5vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0.65rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.captcha {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.65);
  transition: border-color 0.25s, box-shadow 0.25s;
}

.captcha.is-loading,
.captcha.is-done {
  border-color: rgba(15, 107, 76, 0.35);
  box-shadow: 0 0 0 3px rgba(15, 107, 76, 0.08);
}

.check-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
}

.check-row input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
}

.box {
  position: relative;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border: 2px solid #6b7f75;
  border-radius: 5px;
  display: grid;
  place-items: center;
  transition: border-color 0.2s, background 0.2s;
}

.tick {
  width: 16px;
  height: 16px;
  color: #fff;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.2s, transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.spinner {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(15, 107, 76, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  opacity: 0;
}

.captcha.is-loading .box {
  border-color: transparent;
}

.captcha.is-loading .spinner {
  opacity: 1;
  animation: spin 0.7s linear infinite;
}

.captcha.is-done .box {
  background: var(--accent);
  border-color: var(--accent);
}

.captcha.is-done .tick {
  opacity: 1;
  transform: scale(1);
}

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

.check-label {
  font-size: 0.95rem;
  font-weight: 500;
}

.captcha-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  color: var(--muted);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  opacity: 0.75;
}

.challenge {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  animation: rise 0.45s ease both;
}

.challenge-q {
  margin: 0 0 0.85rem;
  font-size: 0.98rem;
  font-weight: 500;
}

.options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
}

.opt {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 0.7rem 0.4rem;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, background 0.15s;
}

.opt:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.opt:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.opt.is-wrong {
  animation: shake 0.35s ease;
  border-color: var(--warn);
  color: var(--warn);
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-4px);
  }
  75% {
    transform: translateX(4px);
  }
}

.hint {
  margin: 0.65rem 0 0;
  color: var(--warn);
  font-size: 0.85rem;
}

.status {
  min-height: 1.25rem;
  margin: 1rem 0 0.85rem;
  font-size: 0.88rem;
  color: var(--ok);
  font-weight: 500;
}

.status.is-error {
  color: var(--warn);
}

.cta {
  width: 100%;
  border: none;
  border-radius: 12px;
  padding: 0.9rem 1.2rem;
  font: inherit;
  font-size: 0.98rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
}

.cta:hover:not(:disabled) {
  background: var(--accent-deep);
  transform: translateY(-1px);
}

.cta:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 420px) {
  .panel {
    padding: 1.6rem 1.25rem 1.35rem;
  }

  .options {
    grid-template-columns: repeat(3, 1fr);
  }
}