/* ==========================================================================================
   screens/title.css — title screen: radar + ridgeline backdrop, dot-matrix emblem, big title,
   nickname console. Pure CSS/SVG art; an optional backdrop image fades in underneath.
   ========================================================================================== */

.title-screen { align-items: center; justify-content: center; }

/* ---- backdrop ----------------------------------------------------------------------------------- */
.title-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.title-bg__art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  object-position: center 30%;
  filter: saturate(.8) brightness(.9);
  transition: opacity 600ms ease;
}
.title-bg.has-art .title-bg__art { opacity: .8; }
/* The real backdrop already carries a radar + target point; keep only the sweep over it. */
.title-bg.has-art .title-bg__target { display: none; }
.title-bg.has-art .title-bg__radar { opacity: .35; }
.title-bg__ridge-art {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.1rem;
  height: 3.3rem;
  background-repeat: repeat-x;
  background-position: center bottom;
  background-size: auto 100%;
  opacity: 0;
  transition: opacity 600ms ease;
}
.title-bg.has-ridges .title-bg__ridge-art { opacity: 1; }
.title-bg__ridges { animation: fade-in 600ms ease backwards; }
@keyframes fade-in { from { opacity: 0; } }
.title-bg__glow {
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 0;
  height: 6rem;
  background:
    radial-gradient(48% 42% at 50% 78%, rgba(23, 249, 183, .40), rgba(23, 249, 183, .08) 62%, transparent 76%),
    radial-gradient(26% 26% at 50% 80%, rgba(120, 255, 215, .30), transparent 70%);
  filter: blur(6px);
  animation: glow-breathe 7s ease-in-out infinite;
}
@keyframes glow-breathe { 50% { opacity: .78; } }

.title-bg__radar {
  position: absolute;
  left: 17%;
  top: 40%;
  width: 5.6rem;
  height: 5.6rem;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background:
    radial-gradient(circle, transparent 0 .05rem, rgba(78, 216, 175, .5) .05rem .065rem, transparent .065rem),
    repeating-radial-gradient(circle, transparent 0 .69rem, rgba(78, 216, 175, .16) .69rem .7rem),
    linear-gradient(rgba(78, 216, 175, .12), rgba(78, 216, 175, .12)) center / 100% 1px no-repeat,
    linear-gradient(rgba(78, 216, 175, .12), rgba(78, 216, 175, .12)) center / 1px 100% no-repeat;
  -webkit-mask-image: radial-gradient(circle, #000 55%, transparent 71%);
  mask-image: radial-gradient(circle, #000 55%, transparent 71%);
  opacity: .8;
}
.title-bg__sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  /* The bright edge must LEAD and the glow must trail BEHIND it. A conic gradient's angle grows
     clockwise from 0deg (12 o'clock), and radar-sweep rotates clockwise too — so the bright end has
     to sit at 100% (== 0deg) and fade counter-clockwise from there. Written the other way round
     (bright at 0% fading to 22%) the glow fans out AHEAD of the beam and the sweep reads backwards. */
  background: conic-gradient(from 0deg, transparent 0 78%, rgba(23, 249, 183, .28) 100%);
  animation: radar-sweep 6s linear infinite;
}
@keyframes radar-sweep { to { transform: rotate(360deg); } }

.title-bg__target {
  position: absolute;
  right: 12%;
  top: 22%;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(246, 163, 41, .9) 0 .06rem, transparent .065rem),
    radial-gradient(circle, transparent 0 .2rem, rgba(246, 163, 41, .5) .2rem .215rem, transparent .215rem),
    radial-gradient(circle, transparent 0 .5rem, rgba(246, 163, 41, .22) .5rem .51rem, transparent .51rem),
    radial-gradient(circle, rgba(246, 163, 41, .18), transparent 70%);
  animation: target-pulse 3.2s ease-in-out infinite;
}
.title-bg__target::after {
  content: 'TARGET POINT';
  position: absolute;
  left: 110%;
  top: 50%;
  transform: translateY(-50%);
  padding: .02rem .08rem;
  border: 1px solid rgba(246, 163, 41, .35);
  font-family: var(--font-display);
  font-size: .1rem;
  letter-spacing: .2em;
  color: rgba(246, 163, 41, .7);
  white-space: nowrap;
}
@keyframes target-pulse { 50% { transform: scale(1.06); opacity: .75; } }

.title-bg__ridges { position: absolute; left: 0; right: 0; bottom: 0; width: 100%; height: 40%; }
.title-bg__ridges .ridge { stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.title-bg__ridges .ridge--far { opacity: .95; }
.title-bg__haze {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(12, 15, 14, .6) 0%, transparent 25%, transparent 70%, rgba(6, 8, 7, .7) 100%),
    radial-gradient(46% 42% at 50% 44%, rgba(10, 13, 12, .82), rgba(10, 13, 12, .4) 60%, transparent 80%);
}

/* ---- corners ------------------------------------------------------------------------------------- */
.title-corner { position: absolute; z-index: 2; display: flex; align-items: flex-start; gap: .12rem; line-height: 1.7; }
.title-corner--tl { left: .44rem; top: .38rem; }
.title-corner--tr { right: .44rem; top: .38rem; text-align: right; }
.title-corner__mark {
  width: .32rem;
  height: .32rem;
  margin-top: .02rem;
  border: 1px solid var(--mint-700);
  background:
    linear-gradient(var(--mint-500), var(--mint-500)) center / 40% 2px no-repeat,
    linear-gradient(var(--mint-500), var(--mint-500)) center / 2px 40% no-repeat;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
}

/* ---- centre column ------------------------------------------------------------------------------- */
.title-main {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: -.3rem;
}

.emblem { position: relative; display: flex; align-items: center; gap: .26rem; margin-bottom: .26rem; animation: rise-in 600ms var(--ease-out) backwards; }
.emblem__svg { width: 1.3rem; height: 1.4rem; overflow: visible; filter: drop-shadow(0 0 .12rem rgba(210, 255, 240, .25)); }
.emblem__svg circle { fill: #dfe6e2; animation: dot-twinkle 4.8s ease-in-out infinite; }
.emblem__svg circle.d1 { animation-delay: -.7s; }
.emblem__svg circle.d2 { animation-delay: -1.4s; }
.emblem__svg circle.d3 { animation-delay: -2.1s; }
.emblem__svg circle.d4 { animation-delay: -2.8s; }
.emblem__svg circle.d5 { animation-delay: -3.5s; }
.emblem__svg circle.d6 { animation-delay: -4.2s; }
.emblem__svg circle.is-accent { fill: var(--mint-glow); filter: drop-shadow(0 0 .04rem var(--mint-glow)); animation: none; }
@keyframes dot-twinkle { 0%, 100% { opacity: 1; } 50% { opacity: .55; } }
.emblem__bracket { width: .16rem; height: 1.7rem; border: 2px solid rgba(223, 230, 226, .45); }
.emblem__bracket--l { border-right: 0; }
.emblem__bracket--r { border-left: 0; }

.title-en {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .02rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  line-height: 1;
  animation: rise-in 600ms 80ms var(--ease-out) backwards;
}
.title-en__a { font-size: .34rem; font-weight: 500; letter-spacing: .3em; padding-left: .3em; color: #cdd6d1; }
.title-en__b {
  font-size: .38rem;
  font-weight: 700;
  letter-spacing: .34em;
  padding-left: .34em;
  color: var(--mint-500);
  text-shadow: 0 0 .18rem rgba(23, 249, 183, .45);
}
.title-cn {
  margin-top: .14rem;
  font-size: 1.02rem;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: .06em;
  color: #f4f6f5;
  text-shadow: 0 .04rem .2rem rgba(0, 0, 0, .7);
  animation: rise-in 600ms 140ms var(--ease-out) backwards;
}
.title-cn__colon { color: #f4f6f5; }
.title-cn em { font-style: normal; color: var(--mint-500); text-shadow: 0 0 .26rem rgba(23, 249, 183, .45); }
.title-tag {
  margin-top: .12rem;
  font-size: .19rem;
  color: var(--text-lo);
  letter-spacing: .1em;
  animation: rise-in 600ms 200ms var(--ease-out) backwards;
}
@keyframes rise-in { from { opacity: 0; transform: translateY(.14rem); } }

.title-login {
  --bk-c: var(--mint-500);
  position: relative;
  width: 4.9rem;
  margin-top: .42rem;
  display: flex;
  flex-direction: column;
  gap: .16rem;
  padding: .24rem .28rem .2rem;
  background: linear-gradient(180deg, rgba(20, 25, 23, .82), rgba(10, 13, 12, .88));
  border: 1px solid var(--line-2);
  box-shadow: 0 .2rem .5rem rgba(0, 0, 0, .5), 0 0 .5rem rgba(23, 249, 183, .06);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  animation: rise-in 600ms 260ms var(--ease-out) backwards;
}
.title-login::before {
  content: '';
  position: absolute;
  left: -1px;
  right: -1px;
  top: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--mint-500), transparent 60%);
}
.title-login .btn--xl { letter-spacing: .6em; padding-left: calc(.48rem + .3em); }
.title-invite {
  display: flex;
  align-items: center;
  gap: .08rem;
  padding: .08rem .12rem;
  background: rgba(246, 163, 41, .08);
  border: 1px solid rgba(246, 163, 41, .35);
  color: var(--amber);
  font-size: .16rem;
}
.title-invite .icon { width: .2rem; height: .2rem; }
.title-invite b { font-size: .2rem; letter-spacing: .2em; color: #ffd08a; }
.title-conn { display: flex; align-items: center; justify-content: center; gap: .1rem; min-height: .32rem; font-size: .14rem; color: var(--text-lo); }
.title-conn .ping { height: .26rem; font-size: .15rem; }

.title-foot {
  position: absolute;
  z-index: 2;
  left: .44rem;
  right: .44rem;
  bottom: .3rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  font-size: .13rem;
  color: var(--text-dim);
}