:root {
  --bg: #0b0d18;
  --panel: #151a2e;
  --ink: #f4f5fb;
  --dim: #9aa1c4;
  --accent: #7c6cff;
  --accent-2: #35d0ba;
  --card: linear-gradient(160deg, #221f4d 0%, #171a33 70%);
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  color: var(--ink);
  background: radial-gradient(1200px 800px at 80% -10%, #2a2360 0%, transparent 55%),
              radial-gradient(900px 700px at -10% 110%, #123c3a 0%, transparent 50%),
              var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 首页 ---------- */
body.home { display: grid; place-items: center; }
.home-card {
  width: min(560px, 92vw);
  padding: 48px 44px;
  background: rgba(21, 26, 46, 0.72);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 26px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.45);
  backdrop-filter: blur(16px);
}
.logo { font-size: 22px; font-weight: 700; letter-spacing: 2px; color: var(--accent-2); }
.logo .dot { color: var(--accent); margin: 0 4px; }
.home-card h1 { font-size: 40px; line-height: 1.15; margin: 18px 0 10px; letter-spacing: 1px; }
.sub { color: var(--dim); font-size: 16px; line-height: 1.7; margin: 0 0 28px; }
.field { display: block; margin-bottom: 22px; }
.field span { display: block; font-size: 14px; color: var(--dim); margin-bottom: 10px; }
.field input {
  width: 100%; padding: 16px 18px; font-size: 18px; color: var(--ink);
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px; outline: none;
}
.field input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(124,108,255,0.18); }
.btn-primary {
  width: 100%; padding: 16px; font-size: 18px; font-weight: 700; color: #fff; cursor: pointer;
  background: linear-gradient(135deg, var(--accent) 0%, #5a8bff 100%);
  border: 0; border-radius: 14px;
  box-shadow: 0 12px 30px rgba(124,108,255,0.35);
  transition: transform .12s ease, filter .12s ease;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled { opacity: .6; cursor: default; }
.hint { color: var(--dim); font-size: 14px; min-height: 20px; margin: 14px 0 0; }

/* ---------- 大屏 ---------- */
body.stage {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  overflow: hidden;
}
.stage-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 32px;
  padding: 34px 48px 20px;
}
.kicker { font-size: 14px; letter-spacing: 4px; color: var(--accent-2); margin-bottom: 10px; }
.stage-question { font-size: clamp(30px, 4.2vw, 62px); line-height: 1.18; margin: 0; max-width: 15ch; }
.join-box {
  display: flex; align-items: center; gap: 22px; flex: none;
  padding: 20px 24px; background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1); border-radius: 20px;
}
.join-label { font-size: 14px; color: var(--dim); letter-spacing: 1px; }
.join-code { font-size: 44px; font-weight: 800; letter-spacing: 6px; color: #fff; line-height: 1.15; }
.join-url { font-size: 13px; color: var(--dim); margin-top: 4px; }
.qr { width: 148px; height: 148px; border-radius: 12px; background: #fff; padding: 6px; }

.answer-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
  padding: 10px 48px 30px;
  align-content: start;
  overflow: hidden;
}
.answer {
  padding: 22px 24px; border-radius: var(--radius); background: var(--card);
  border: 1px solid rgba(255,255,255,0.08);
  font-size: clamp(18px, 1.6vw, 26px); line-height: 1.5;
  animation: pop .45s cubic-bezier(.2,.9,.3,1.3);
  word-break: break-word;
}
.answer .seq { display: block; font-size: 12px; color: var(--accent-2); letter-spacing: 2px; margin-bottom: 8px; }
.answer.fresh { border-color: rgba(53,208,186,.9); box-shadow: 0 0 0 3px rgba(53,208,186,.22), 0 18px 50px rgba(53,208,186,.12); }
@keyframes pop { from { opacity: 0; transform: translateY(16px) scale(.97); } to { opacity: 1; transform: none; } }
.empty { grid-column: 1/-1; text-align: center; color: var(--dim); font-size: 20px; padding: 8vh 0; }
.stage-foot {
  display: flex; align-items: center; gap: 26px;
  padding: 18px 48px 26px; border-top: 1px solid rgba(255,255,255,0.07);
}
.stat { font-size: 18px; font-weight: 700; }
.stat.dim { color: var(--dim); font-weight: 400; font-size: 15px; }

/* ---------- 手机作答 ---------- */
body.phone { display: flex; align-items: flex-start; justify-content: center; padding: 34px 18px 60px; background: #f5f6fb; color: #1b1d2a; }
.phone-card {
  width: min(480px, 100%); background: #fff; border-radius: 26px; padding: 30px 24px 24px;
  box-shadow: 0 20px 60px rgba(24,28,60,0.12);
}
.phone-kicker { color: #6b5cff; font-weight: 700; letter-spacing: 4px; font-size: 14px; }
.phone-question { font-size: 28px; line-height: 1.32; margin: 14px 0 24px; letter-spacing: .5px; }
.answer-form textarea {
  width: 100%; min-height: 120px; padding: 16px; font-size: 18px; line-height: 1.6;
  color: #1b1d2a; background: #f7f8fc; border: 1px solid #e3e6f0; border-radius: 16px;
  resize: vertical; outline: none; font-family: var(--font);
}
.answer-form textarea:focus { border-color: #7c6cff; box-shadow: 0 0 0 4px rgba(124,108,255,.12); }
.row { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 14px; }
.left { font-size: 13px; color: #8b90a8; }
.row .btn-primary { width: auto; padding: 12px 30px; font-size: 17px; }
.done { text-align: center; padding: 26px 0 10px; }
.done-icon {
  width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 50%;
  display: grid; place-items: center; font-size: 32px; color: #fff;
  background: linear-gradient(135deg, #35d0ba, #4a9bff);
}
.done-text { font-size: 20px; font-weight: 700; margin-bottom: 20px; }
.btn-ghost {
  padding: 12px 22px; font-size: 15px; cursor: pointer;
  color: #5a4ff0; background: #ecebff; border: 0; border-radius: 12px;
}
.phone-foot { text-align: center; font-size: 12px; color: #9aa0b8; margin-top: 24px; }