:root {
  --text: #f5f7fb;
  --muted: #aab2c0;
  --glass: rgba(12, 14, 20, 0.6);
  --glass-border: rgba(255, 255, 255, 0.12);
  --pink: #ff5fa2;
  --purple: #b57bff;
  --cyan: #5ee7ff;
  --glow: 0;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }

body {
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: #0a0a10;
  position: relative;
  overflow-x: hidden;
}

/* Lớp tối phủ lên nước gợn để chữ dễ đọc (nằm trên #water, dưới #bg) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(255,95,162,.15), transparent 45%),
    radial-gradient(circle at 80% 90%, rgba(94,231,255,.12), transparent 45%),
    linear-gradient(160deg, rgba(0,0,0,.25), rgba(0,0,0,.55));
  z-index: -1;
  pointer-events: none;
}

/* Lớp nước gợn: ảnh nền được vẽ bằng canvas, nằm dưới cùng */
#water {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  pointer-events: none;
}

/* Canvas hạt: nằm trên lớp tối */
#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* Khung chính: vệt sáng quét và nghiêng 3D theo chuột */
.card-wrap {
  position: relative;
  overflow: hidden;
  width: min(460px, 100%);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 28px;
  padding: 2.5rem 2rem 2rem;
  text-align: center;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 25px 70px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.08);
  animation: rise .9s cubic-bezier(.2,.8,.2,1) both;
  transform-style: preserve-3d;
  transition: transform .2s ease-out;
  will-change: transform;
}
.card-wrap::after {
  content: "";
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: linear-gradient(105deg, transparent, rgba(255,255,255,.16), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
  animation: sweep 10s ease-in-out infinite;
}
@keyframes sweep {
  0%   { left: -75%; }
  12%  { left: 125%; }
  100% { left: 125%; }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(30px) scale(.98); }
  to   { opacity: 1; transform: none; }
}

/* Avatar */
.avatar-wrap {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto 1.4rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  isolation: isolate;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

/* Dải vầng sáng chính quay quanh viền */
.avatar-wrap::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    transparent 150deg,
    rgba(94,231,255,.08) 200deg,
    rgba(94,231,255,.35) 255deg,
    rgba(94,231,255,.85) 315deg,
    #5ee7ff 338deg,
    #ffffff 354deg,
    transparent 360deg
  );
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 7px), #000 100%);
          mask: radial-gradient(farthest-side, transparent calc(100% - 7px), #000 100%);
  filter: drop-shadow(0 0 6px var(--cyan)) drop-shadow(0 0 14px rgba(94,231,255,.7));
  animation: orbit-spin 5s linear infinite;
  z-index: 0;
  opacity: calc(.6 + var(--glow) * .4);
  pointer-events: none;
}

/* Lớp hào quang mờ lớn, quay ngược chiều */
.avatar-wrap::after {
  content: "";
  position: absolute;
  inset: -22px;
  border-radius: 50%;
  background: conic-gradient(
    from 180deg,
    transparent 0deg,
    transparent 200deg,
    rgba(181,123,255,.25) 280deg,
    rgba(94,231,255,.35) 330deg,
    transparent 360deg
  );
  filter: blur(10px);
  opacity: .9;
  animation: orbit-spin-rev 5s linear infinite;
  z-index: -1;
  pointer-events: none;
}

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

/* Ảnh avatar: độ sáng và viền phát sáng được JS điều khiển qua --glow (0 → 1) */
.avatar {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: #15151d;
  border: 2px solid rgba(255,255,255,.18);
  filter: brightness(calc(1 + var(--glow) * .35)) saturate(calc(1 + var(--glow) * .2));
  box-shadow:
    0 0 20px rgba(94,231,255,.25),
    0 0 calc(20px + var(--glow) * 30px) rgba(255,179,71,calc(var(--glow) * .9)),
    0 0 calc(var(--glow) * 60px) rgba(255,45,117,calc(var(--glow) * .6));
  pointer-events: none;
}

/* Canvas lửa: lớn hơn avatar, căn giữa với avatar */
.fire {
  position: absolute;
  left: -60px;
  top: -60px;
  width: 270px;
  height: 270px;
  pointer-events: none;
  z-index: 3;
}

/* Chữ */
.name {
  font-family: "Bungee", "Righteous", sans-serif;
  font-size: 2rem;
  margin: 0 0 .3rem;
  background: linear-gradient(90deg, var(--pink), var(--purple), var(--cyan), var(--pink));
  background-size: 300% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shine 4s linear infinite;
}
@keyframes shine { to { background-position: 300% center; } }

.nick {
  font-family: "Orbitron", sans-serif;
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .15em;
  color: var(--cyan);
  margin: 0 0 .7rem;
}
.bio {
  font-weight: 600;
  font-size: 1.05rem;
  margin: 0;
}
.tag {
  color: var(--pink);
  font-size: .9rem;
  font-weight: 500;
  margin: .5rem 0 0;
}

/* Nút liên kết */
.links {
  display: grid;
  gap: .9rem;
  margin: 2rem 0 1.5rem;
}
.link-btn {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: .9rem;
  padding: .9rem 1.1rem;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: rgba(255,255,255,.05);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  text-align: left;
  transition: transform .2s ease, border-color .3s ease, box-shadow .3s ease, background .3s ease;
}
.link-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,.15), transparent);
  transform: translateX(-100%);
  transition: transform .6s ease;
}
.link-btn:hover::before { transform: translateX(100%); }
.link-btn:hover {
  transform: translateY(-3px);
  border-color: var(--purple);
  box-shadow: 0 12px 30px rgba(181,123,255,.35);
  background: linear-gradient(120deg, rgba(255,95,162,.18), rgba(94,231,255,.18));
}
.link-btn:active { transform: scale(.96); }
.link-btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.link-btn .icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--pink), var(--purple));
  color: #fff;
  box-shadow: 0 6px 16px rgba(181,123,255,.4);
}
.link-btn .icon svg { display: block; }
.link-btn .label { font-size: 1rem; letter-spacing: .02em; }
.link-btn .arrow {
  color: var(--cyan);
  font-size: 1.2rem;
  transition: transform .25s ease;
}
.link-btn:hover .arrow { transform: translateX(5px); }

/* Gợn sóng khi bấm */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,.5);
  transform: scale(0);
  animation: ripple .6s ease-out forwards;
  pointer-events: none;
}
@keyframes ripple { to { transform: scale(4); opacity: 0; } }

.foot {
  font-size: .85rem;
  color: var(--muted);
  margin: 0;
  letter-spacing: .05em;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
/* Nút bật/tắt nhạc nền */
.music-btn {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 10;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .3s ease;
}
.music-btn:hover { transform: scale(1.08); box-shadow: 0 0 18px rgba(94,231,255,.5); }
.music-btn.playing { color: var(--cyan); animation: music-pulse 1.4s ease-in-out infinite; }
@keyframes music-pulse {
  0%, 100% { box-shadow: 0 0 6px rgba(94,231,255,.4); }
  50%      { box-shadow: 0 0 18px rgba(94,231,255,.8); }
}