/* =========================================================
   PHUONGCUTE — ARTISTIC MUSIC BUTTON
   Floating Glass / Pearl / Aurora
   ========================================================= */

.music-btn {
    --music-x: 0px;
    --music-y: 0px;
    --music-rx: 0deg;
    --music-ry: 0deg;
    position: fixed !important;
    right: 24px !important;
    bottom: 20px !important;
    z-index: 30 !important;
    width: 174px;
    height: 58px;
    padding: 0 18px 0 10px !important;
    display: flex !important;
    align-items: center;
    gap: 11px;
    border: 0 !important;
    border-radius: 22px !important;
    color: rgba(255,255,255,.97) !important;
    background: linear-gradient(135deg, rgba(255,255,255,.20), rgba(255,124,172,.23) 42%, rgba(183,30,91,.42)) !important;
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    box-shadow: 0 16px 34px rgba(190,52,105,.18), 0 3px 10px rgba(194,40,93,.10), inset 0 1px 0 rgba(255,255,255,.75), inset 0 -1px 0 rgba(255,255,255,.08) !important;
    font-family: inherit;
    font-weight: 800;
    font-size: 14px;
    cursor: pointer;
    isolation: isolate;
    overflow: visible !important;
    transform: translate3d(var(--music-x), var(--music-y), 0) rotateX(var(--music-rx)) rotateY(var(--music-ry));
    transform-style: preserve-3d;
    transition: transform .24s cubic-bezier(.2,.8,.2,1), box-shadow .4s ease, filter .3s ease;
    animation: musicFloat 5s ease-in-out infinite;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

.music-btn:focus:not(:focus-visible) {
    outline: none;
}

.music-btn:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.92);
    outline-offset: 4px;
}

.music-btn::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    padding: 1px;
    background: conic-gradient(from 0deg, rgba(255,255,255,.9), rgba(255,113,164,.66), rgba(255,255,255,.14), rgba(255,219,234,.84), rgba(255,255,255,.9));
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: musicRim 7s linear infinite;
    pointer-events: none;
}

.music-btn::after {
    content: '';
    position: absolute;
    width: 120px;
    height: 120px;
    left: -42px;
    top: -58px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,.34), rgba(255,171,204,.12) 35%, transparent 68%);
    filter: blur(3px);
    transition: transform .8s cubic-bezier(.2,.8,.2,1), opacity .5s ease;
    pointer-events: none;
}

.music-btn:hover {
    transform: translate3d(var(--music-x), -3px, 0) rotateX(var(--music-rx)) rotateY(var(--music-ry)) scale(1.035) !important;
    filter: brightness(1.05) saturate(1.08);
    box-shadow: 0 20px 42px rgba(196,43,101,.25), 0 0 34px rgba(255,103,158,.18), 0 0 0 5px rgba(255,173,202,.10), inset 0 1px 0 rgba(255,255,255,.82) !important;
}

.music-btn:hover::after { transform: translate3d(95px,12px,0); }

.music-shine {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

.music-shine::after {
    content: '';
    position: absolute;
    top: 0;
    left: -90%;
    width: 45%;
    height: 100%;
    transform: skewX(-20deg);
    background: linear-gradient(90deg, transparent, rgba(255,255,255,.45), transparent);
}

.music-btn:hover .music-shine::after { animation: musicShine .78s ease; }

.music-core {
    position: relative;
    flex: 0 0 auto;
    width: 40px;
    height: 40px;
    border-radius: 15px;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at 30% 25%, rgba(255,255,255,.76), rgba(255,255,255,.22) 35%, rgba(255,111,160,.14));
    border: 1px solid rgba(255,255,255,.45);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.58), 0 7px 16px rgba(145,30,79,.15);
    transform: translateZ(20px);
    transition: transform .45s cubic-bezier(.2,1.4,.4,1), box-shadow .45s ease, background .45s ease;
    z-index: 3;
}

.music-icon {
    font-size: 19px;
    line-height: 1;
    filter: drop-shadow(0 3px 5px rgba(127,18,66,.20));
    transition: transform .45s cubic-bezier(.2,1.4,.4,1);
}

.music-label {
    position: relative;
    z-index: 3;
    white-space: nowrap;
    text-shadow: 0 2px 9px rgba(124,15,59,.18);
    transform: translateZ(18px);
}

.sound-wave {
    position: absolute;
    left: 12px;
    bottom: 6px;
    width: 16px;
    height: 8px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 2px;
    opacity: .24;
    transition: opacity .35s ease;
}

.sound-wave span { width: 2px; height: 3px; border-radius: 4px; background: rgba(255,255,255,.95); transform-origin: bottom; }

.music-orbit {
    position: absolute;
    inset: -15px -14px;
    border-radius: 30px;
    border: 1px solid rgba(255,126,171,.15);
    opacity: 0;
    pointer-events: none;
    z-index: -1;
}

.music-orbit::before {
    content: '✦';
    position: absolute;
    right: 6px;
    top: -9px;
    color: rgba(255,255,255,.92);
    font-size: 11px;
    filter: drop-shadow(0 0 8px rgba(255,100,160,.72));
}

.music-orbit::after {
    content: '';
    position: absolute;
    width: 5px;
    height: 5px;
    right: 33px;
    top: 5px;
    border-radius: 50%;
    background: rgba(255,255,255,.92);
    box-shadow: 0 0 12px rgba(255,118,169,.78);
}

.floating-note {
    position: absolute;
    left: 50%;
    top: 50%;
    opacity: 0;
    color: rgba(255,255,255,.96);
    font-family: Georgia, serif;
    font-weight: 700;
    pointer-events: none;
    filter: drop-shadow(0 4px 8px rgba(149,31,75,.18));
    z-index: 0;
}

.music-btn.is-playing {
    box-shadow: 0 20px 42px rgba(196,43,101,.24), 0 0 38px rgba(255,76,143,.22), 0 0 75px rgba(255,130,175,.12), inset 0 1px 0 rgba(255,255,255,.82) !important;
    animation: musicBreath 2.4s ease-in-out infinite;
}

.music-btn.is-playing::after { opacity: .85; animation: musicGlow 2.4s ease-in-out infinite; }

.music-btn.is-playing .music-core {
    background: radial-gradient(circle at 35% 25%, rgba(255,255,255,.82), rgba(255,119,169,.28) 42%, rgba(255,67,133,.20));
    box-shadow: inset 0 1px 0 rgba(255,255,255,.6), 0 0 18px rgba(255,94,151,.28);
    animation: corePulse 1.5s ease-in-out infinite;
}

.music-btn.is-playing .music-icon { animation: noteDance .85s ease-in-out infinite; }
.music-btn.is-playing .sound-wave { opacity: 1; }
.music-btn.is-playing .sound-wave span:nth-child(1) { animation: waveA .55s ease-in-out infinite alternate; }
.music-btn.is-playing .sound-wave span:nth-child(2) { animation: waveB .48s ease-in-out infinite alternate; }
.music-btn.is-playing .sound-wave span:nth-child(3) { animation: waveC .60s ease-in-out infinite alternate; }
.music-btn.is-playing .music-orbit { opacity: 1; animation: orbitGlow 2.8s ease-in-out infinite, orbitSpin 8s linear infinite; }
.music-btn.is-playing .floating-note.note-1 { animation: noteFloatA 2.2s ease-out infinite; }
.music-btn.is-playing .floating-note.note-2 { animation: noteFloatB 2.7s ease-out .7s infinite; }
.music-btn.is-playing .floating-note.note-3 { animation: noteFloatC 2.4s ease-out 1.4s infinite; }

.music-ripple {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,.82);
    pointer-events: none;
    z-index: 4;
    animation: musicRipple .7s cubic-bezier(.2,.8,.2,1) forwards;
}

@keyframes musicFloat { 0%,100% { translate: 0 0; } 50% { translate: 0 -3px; } }
@keyframes musicRim { to { rotate: 360deg; } }
@keyframes musicBreath { 0%,100% { scale: 1; } 50% { scale: 1.018; } }
@keyframes musicGlow { 0%,100% { transform: scale(.95); opacity: .3; } 50% { transform: scale(1.12); opacity: .85; } }
@keyframes corePulse { 0%,100% { scale: 1; } 50% { scale: 1.045; } }
@keyframes noteDance { 0%,100% { transform: translateY(0) rotate(-5deg); } 50% { transform: translateY(-2px) rotate(6deg) scale(1.08); } }
@keyframes waveA { to { height: 7px; } }
@keyframes waveB { to { height: 10px; } }
@keyframes waveC { to { height: 6px; } }
@keyframes orbitSpin { to { rotate: 360deg; } }
@keyframes orbitGlow { 0%,100% { transform: scale(.97); opacity: .35; } 50% { transform: scale(1.025); opacity: .85; } }
@keyframes musicShine { from { transform: translateX(-20%); } to { transform: translateX(420%); } }
@keyframes musicRipple { from { opacity: .85; transform: translate(-50%,-50%) scale(.5); } to { opacity: 0; transform: translate(-50%,-50%) scale(9); } }
@keyframes noteFloatA { 0% { opacity:0; transform:translate(-5px,6px) scale(.5) rotate(-10deg); } 18% { opacity:.9; } 100% { opacity:0; transform:translate(-46px,-44px) scale(1.1) rotate(-22deg); } }
@keyframes noteFloatB { 0% { opacity:0; transform:translate(3px,4px) scale(.5) rotate(8deg); } 18% { opacity:.85; } 100% { opacity:0; transform:translate(44px,-38px) scale(1.05) rotate(18deg); } }
@keyframes noteFloatC { 0% { opacity:0; transform:translate(3px,2px) scale(.4); } 20% { opacity:.9; } 100% { opacity:0; transform:translate(59px,-3px) scale(1); } }

@media (max-width: 768px) {
    .music-btn { right: 16px !important; bottom: 16px !important; width: 158px; height: 52px; padding-right: 15px !important; }
    .music-orbit { display: none !important; }
}

@media (hover: none), (pointer: coarse) {
    .music-btn:hover { transform: none !important; filter: none; }
}

@media (prefers-reduced-motion: reduce) {
    .music-btn,
    .music-btn::before,
    .music-btn::after,
    .music-btn.is-playing,
    .music-btn.is-playing::after,
    .music-btn.is-playing .music-core,
    .music-btn.is-playing .music-icon,
    .music-btn.is-playing .music-orbit,
    .floating-note,
    .sound-wave span { animation: none !important; }
}