:root {
  --danger: #c0392b;
  --danger-dark: #96261a;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #eceef2;
  --bg: #f4f6fb;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.screen {
  display: none;
  min-height: 100vh;
  min-height: 100dvh;
  padding: env(safe-area-inset-top) 16px calc(24px + env(safe-area-inset-bottom));
}
.screen.active { display: flex; }

/* ---------- 警告界面 ---------- */
#warning-screen {
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(1200px 400px at 50% -10%, rgba(192, 57, 43, 0.18), transparent 60%),
    var(--bg);
}

.card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: 20px;
  padding: 28px 22px 20px;
  box-shadow: 0 18px 50px rgba(20, 24, 40, 0.12);
  animation: pop 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes pop {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.alert-badge {
  width: 76px;
  height: 76px;
  margin: 0 auto 14px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(192, 57, 43, 0.1);
  animation: pulse 1.8s ease-in-out infinite;
}
.alert-icon { font-size: 40px; }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(192, 57, 43, 0.28); }
  50% { box-shadow: 0 0 0 16px rgba(192, 57, 43, 0); }
}

.title {
  margin: 0 0 8px;
  text-align: center;
  font-size: 24px;
  color: var(--danger);
  letter-spacing: 1px;
}

.subtitle {
  margin: 0 0 18px;
  text-align: center;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}
.subtitle strong { color: var(--danger); }

.risk-meta {
  background: #fbfbfd;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 6px 14px;
  margin-bottom: 20px;
}
.risk-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  font-size: 13.5px;
  border-bottom: 1px solid var(--line);
}
.risk-row:last-child { border-bottom: none; }
.risk-row > span:first-child { color: var(--muted); }
.risk-row .danger { color: var(--danger); font-weight: 600; }

.field-label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.code-row { display: flex; gap: 10px; margin-bottom: 12px; }

.code-input {
  flex: 1;
  min-width: 0;
  height: 50px;
  padding: 0 14px;
  font-size: 18px;
  letter-spacing: 4px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  outline: none;
  transition: border-color 0.2s;
}
.code-input:focus { border-color: var(--danger); }

/* 惰性输入框：不可输入、点击无反应，纯装饰 */
.code-input[readonly] {
  pointer-events: none;
  user-select: none;
  caret-color: transparent;
  background: #f7f8fa;
  color: #9aa1ad;
}

.send-btn {
  flex: 0 0 auto;
  min-width: 108px;
  height: 50px;
  padding: 0 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--danger);
  background: rgba(192, 57, 43, 0.08);
  border: 1.5px solid rgba(192, 57, 43, 0.25);
  border-radius: 12px;
  cursor: pointer;
  transition: opacity 0.2s, background 0.2s;
}
.send-btn:active { opacity: 0.7; }
.send-btn:disabled {
  color: var(--muted);
  background: #f2f3f6;
  border-color: var(--line);
  cursor: not-allowed;
}

.hint {
  min-height: 18px;
  margin: 0 0 14px;
  font-size: 12.5px;
  color: var(--muted);
  transition: color 0.2s;
}
.hint.error { color: var(--danger); }
.hint.ok { color: #1f9d55; }

.primary-btn {
  width: 100%;
  height: 52px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #fff;
  background: linear-gradient(135deg, var(--danger), var(--danger-dark));
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(192, 57, 43, 0.3);
  transition: transform 0.1s, box-shadow 0.2s;
}
.primary-btn:active { transform: translateY(1px); box-shadow: 0 4px 12px rgba(192, 57, 43, 0.28); }
.primary-btn.light {
  background: #fff;
  color: var(--danger);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.footer-note {
  margin: 16px 0 4px;
  text-align: center;
  font-size: 11.5px;
  color: #9aa1ad;
}

.shake { animation: shake 0.4s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

/* ---------- 揭晓界面 ---------- */
#reveal-screen {
  position: relative;
  overflow: hidden;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(160deg, #ff9a3c, #ff6a88 55%, #7b5cff);
  color: #fff;
}
#reveal-screen.active { display: flex; }

#confetti {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.reveal-content {
  position: relative;
  z-index: 2;
  max-width: 420px;
  padding: 20px;
  animation: pop 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.reveal-emoji { font-size: 72px; animation: bounce 1.4s ease-in-out infinite; }
@keyframes bounce {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-14px) rotate(8deg); }
}

.reveal-title {
  margin: 6px 0 14px;
  font-size: 30px;
  text-shadow: 0 4px 18px rgba(0, 0, 0, 0.2);
}
.reveal-text { font-size: 17px; line-height: 1.8; margin: 0 0 10px; }
.reveal-sub { font-size: 14px; opacity: 0.92; margin: 0 0 26px; }