* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: "FangSong", "STFangsong", "SimSun", "KaiTi", serif;
  color: #f3e6c8;
}

body.sg-title-page {
  position: relative;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 40%, rgba(0,0,0,0.15), rgba(0,0,0,0.72)),
    url("./sg/bg-battlefield.png") center 30% / cover no-repeat #1d1208;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

body.sg-title-page::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, transparent 45%, rgba(10,5,0,0.55) 100%),
    linear-gradient(120deg, rgba(160,40,20,0.10), transparent 45%, rgba(200,160,60,0.08));
  pointer-events: none;
  filter: blur(1px);
}

#start {
  position: relative;
  z-index: 2;
  width: min(560px, 92vw);
  padding: 46px 40px 40px;
  border-radius: 4px;
  border: 1px solid rgba(205,170,90,0.55);
  box-shadow:
    0 30px 70px rgba(0,0,0,0.6),
    inset 0 0 60px rgba(120,70,20,0.18);
  background: linear-gradient(180deg, rgba(30,18,8,0.82), rgba(16,9,4,0.9));
  text-align: center;
  backdrop-filter: blur(3px);
}

.title-main {
  font-size: 52px;
  letter-spacing: 10px;
  font-weight: 700;
  color: #ffe6a0;
  text-shadow:
    0 0 22px rgba(255,210,90,0.45),
    0 3px 0 rgba(90,40,10,0.9),
    0 7px 26px rgba(0,0,0,0.9);
  margin-bottom: 6px;
  animation: sgTitleGlow 3.2s ease-in-out infinite;
}

@keyframes sgTitleGlow {
  0%, 100% { text-shadow: 0 0 18px rgba(255,210,90,0.4), 0 3px 0 rgba(90,40,10,0.9), 0 7px 26px rgba(0,0,0,0.9); }
  50% { text-shadow: 0 0 34px rgba(255,220,120,0.75), 0 3px 0 rgba(90,40,10,0.9), 0 10px 34px rgba(0,0,0,0.95); }
}

.title-sub {
  font-size: 30px;
  letter-spacing: 6px;
  color: #e8c27a;
  text-shadow: 0 2px 8px rgba(0,0,0,0.85);
  margin-bottom: 28px;
}

#start input {
  width: 100%;
  padding: 13px 16px;
  font-size: 20px;
  letter-spacing: 3px;
  color: #ffe6b8;
  background: rgba(10,5,2,0.55);
  border: 1px solid rgba(200,160,80,0.5);
  border-radius: 3px;
  text-align: center;
  margin-bottom: 22px;
  outline: none;
  transition: border-color .2s;
  font-family: inherit;
}

#start input:focus { border-color: #e8b25a; }

#start input::placeholder { color: rgba(240,210,150,0.45); }

#start-btn {
  width: 100%;
  padding: 15px;
  font-size: 24px;
  letter-spacing: 6px;
  font-family: inherit;
  color: #1a0d04;
  cursor: pointer;
  background: linear-gradient(180deg, #f7d489, #c8903a);
  border: 1px solid #a06a1f;
  border-radius: 3px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.45), inset 0 1px 0 rgba(255,255,255,0.5);
  transition: transform .12s, box-shadow .2s;
}

#start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(200,140,40,0.5), inset 0 1px 0 rgba(255,255,255,0.6);
}

#start-btn:active { transform: translateY(0); }

.hint {
  margin-top: 24px;
  font-size: 14px;
  letter-spacing: 2px;
  color: rgba(240,215,160,0.75);
}