/* =========================
   1. CÀI ĐẶT CHUNG
========================= */

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

:root {
    --accent: #78baff;
    --text: #f4f7ff;
    --muted: #c3d0e7;
}

html {
    min-height: 100%;
}

body {
    min-height: 100vh;
    min-height: 100svh;

    display: flex;
    justify-content: center;
    align-items: center;

    padding: 40px 20px;

    overflow-x: hidden;

    background: #071329;
    color: var(--text);

    font-family: Arial, Helvetica, sans-serif;
}


/* =========================
   2. HÌNH NỀN
========================= */

.background {
    position: fixed;
    inset: 0;

    z-index: -3;

    background-color: #102a52;
    background-image: url("assets/background.jpg");

    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;

    transform: scale(1.03);

    animation: background-move 30s ease-in-out infinite alternate;
}

.background-overlay {
    position: fixed;
    inset: 0;

    z-index: -2;

    background:
        linear-gradient(
            180deg,
            rgba(14, 35, 77, 0.38) 0%,
            rgba(12, 40, 91, 0.28) 45%,
            rgba(0, 4, 16, 0.84) 100%
        ),
        radial-gradient(
            circle at 50% 40%,
            rgba(71, 142, 255, 0.22),
            transparent 65%
        );
}


/* =========================
   3. HIỆU ỨNG MƯA
========================= */

.rain {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}

.rain-back {
    opacity: 0.62;
}

.rain-front {
    opacity: 0.9;
}

.raindrop {
    position: absolute;
    top: -30px;
    left: var(--start-x);
    width: var(--width);
    height: var(--length);
    border-radius: 50%;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(194, 222, 255, 0.3) 18%,
        rgba(225, 241, 255, 0.95) 72%,
        rgba(191, 220, 255, 0.2) 100%
    );
    box-shadow: 0 0 5px rgba(186, 220, 255, 0.34);
    opacity: var(--drop-opacity);
    transform: rotate(8deg);
    animation: raindrop-fall var(--fall-duration) linear var(--fall-delay) infinite;
    will-change: transform;
}

.rain-back .raindrop {
    filter: blur(0.35px);
}

.rain-front .raindrop {
    box-shadow: 0 0 7px rgba(203, 229, 255, 0.5);
}

.raindrop::after {
    position: absolute;
    right: -0.5px;
    bottom: 0;
    width: calc(var(--width) + 1px);
    height: calc(var(--width) + 1px);
    border-radius: 50%;
    background: rgba(227, 241, 255, 0.9);
    content: "";
}


/* =========================
   4. ĐOM ĐÓM
========================= */

.fireflies {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.firefly {
    position: absolute;
    left: var(--start-x);
    top: var(--start-y);
    width: var(--size);
    height: var(--size);
    border-radius: 50%;
    background: #fff7a6;
    opacity: 0;
    box-shadow:
        0 0 5px 2px rgba(255, 245, 151, 0.82),
        0 0 14px 5px rgba(255, 199, 75, 0.52),
        0 0 28px 9px rgba(255, 151, 54, 0.2);
    animation:
        firefly-drift var(--duration) linear var(--delay) infinite,
        firefly-glow 2.4s ease-in-out var(--glow-delay) infinite alternate;
}


/* =========================
   5. TRÌNH PHÁT NHẠC
========================= */

.page-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    width: min(520px, 100%);
}

.page-content.is-locked {
    filter: blur(16px);
    opacity: 0.5;
    pointer-events: none;
    transform: scale(1.015);
    user-select: none;
}

body.is-locked::before {
    position: fixed;
    inset: 0;
    z-index: 2;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    content: "";
}

.entry-gate {
    position: fixed;
    inset: 0;
    z-index: 5;
    display: grid;
    place-items: center;
    width: 100%;
    height: 100%;
    padding: 24px;
    border: 0;
    background: transparent;
    color: #f5f5f7;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.entry-gate span {
    font-size: clamp(20px, 3vw, 28px);
    font-weight: 600;
    letter-spacing: 0.01em;
    text-shadow: 0 2px 18px rgba(255, 255, 255, 0.22);
    animation: entry-prompt 3s ease-in-out infinite;
    transition: color 0.3s, text-shadow 0.3s;
}

.entry-gate:hover span,
.entry-gate:focus-visible span {
    color: rgba(255, 255, 255, 0.96);
    text-shadow: 0 0 24px rgba(215, 228, 255, 0.62);
}

.entry-gate:focus-visible {
    outline: none;
}

body.has-entered .page-content {
    filter: none;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    transition:
        filter 0.7s ease,
        opacity 0.7s ease,
        transform 0.7s ease;
}

body.has-entered::before {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.7s ease, visibility 0.7s;
    visibility: hidden;
}

.page-content .profile {
    width: min(390px, 100%);
}

.audio-player {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    min-height: 96px;
    padding: 14px 18px;
    border: 1px solid rgba(255, 255, 255, 0.11);
    border-radius: 18px;
    background: rgba(8, 9, 15, 0.86);
    box-shadow:
        0 18px 48px rgba(0, 0, 0, 0.38),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.track-art {
    flex: 0 0 64px;
    display: grid;
    place-items: center;
    width: 64px;
    height: 64px;
    border-radius: 14px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.17), rgba(255, 255, 255, 0.06));
    color: #f4f4f7;
    transition: box-shadow 0.25s, background 0.25s;
}

.waveform {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.8px;
    width: 46px;
    height: 46px;
}

.waveform span {
    flex: 0 0 2.2px;
    height: 7px;
    border-radius: 2px;
    background: linear-gradient(to top, #b9c5ff, #fff);
    box-shadow: 0 0 5px rgba(173, 188, 255, 0.45);
    transform: scaleY(var(--wave-height, 1));
    transform-origin: center;
}

.waveform span:nth-child(3n + 1) {
    --wave-height: 3.2;
}

.waveform span:nth-child(4n + 2) {
    --wave-height: 4.5;
}

.waveform span:nth-child(5n + 3) {
    --wave-height: 5.6;
}

.waveform span:nth-child(7n + 4) {
    --wave-height: 3.9;
}

.waveform span:nth-child(9n + 5) {
    --wave-height: 5;
}

.audio-player.is-playing .waveform span {
    animation: waveform-bounce 0.42s ease-in-out infinite alternate;
    animation-delay: calc(var(--bar-index, 0) * -0.055s);
}

.audio-player.is-playing .track-art {
    background: linear-gradient(145deg, rgba(145, 157, 255, 0.25), rgba(255, 255, 255, 0.07));
    box-shadow:
        0 0 16px rgba(130, 147, 255, 0.28),
        inset 0 0 12px rgba(202, 211, 255, 0.1);
    animation: track-art-pulse 1s ease-in-out infinite alternate;
}

.waveform span:nth-child(1) { --bar-index: 1; }
.waveform span:nth-child(2) { --bar-index: 2; }
.waveform span:nth-child(3) { --bar-index: 3; }
.waveform span:nth-child(4) { --bar-index: 4; }
.waveform span:nth-child(5) { --bar-index: 5; }
.waveform span:nth-child(6) { --bar-index: 6; }
.waveform span:nth-child(7) { --bar-index: 7; }
.waveform span:nth-child(8) { --bar-index: 8; }
.waveform span:nth-child(9) { --bar-index: 9; }
.waveform span:nth-child(10) { --bar-index: 10; }
.waveform span:nth-child(11) { --bar-index: 11; }
.waveform span:nth-child(12) { --bar-index: 12; }
.waveform span:nth-child(13) { --bar-index: 13; }
.waveform span:nth-child(14) { --bar-index: 14; }
.waveform span:nth-child(15) { --bar-index: 15; }

@keyframes waveform-bounce {
    from {
        transform: scaleY(0.22);
    }

    to {
        transform: scaleY(var(--wave-height, 1));
    }
}

@keyframes track-art-pulse {
    from {
        transform: scale(1);
    }

    to {
        transform: scale(1.055);
    }
}

.player-content {
    flex: 1;
    min-width: 0;
}

.track-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 9px;
}

.track-title {
    overflow: hidden;
    color: #f5f3ef;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 15px;
    font-style: italic;
    font-weight: 600;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.track-artist {
    flex: 0 0 auto;
    color: #aaa9a7;
    font-size: 11px;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 9px;
}

.time-display {
    flex: 0 0 auto;
    color: #c4c3c0;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}

.track-progress {
    flex: 1;
    min-width: 28px;
    height: 16px;
    margin: 0;
    appearance: none;
    -webkit-appearance: none;
    background: transparent;
    cursor: pointer;
}

.track-progress::-webkit-slider-runnable-track {
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(
        to right,
        #f2f0eb 0 var(--progress, 0%),
        rgba(255, 255, 255, 0.34) var(--progress, 0%) 100%
    );
}

.track-progress::-moz-range-track {
    height: 3px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.34);
}

.track-progress::-moz-range-progress {
    height: 3px;
    border-radius: 3px;
    background: #f2f0eb;
}

.track-progress::-webkit-slider-thumb {
    width: 9px;
    height: 9px;
    margin-top: -3px;
    appearance: none;
    -webkit-appearance: none;
    border: 0;
    border-radius: 50%;
    background: #f2f0eb;
    opacity: 0;
    transition: opacity 0.2s;
}

.track-progress::-moz-range-thumb {
    width: 9px;
    height: 9px;
    border: 0;
    border-radius: 50%;
    background: #f2f0eb;
    opacity: 0;
    transition: opacity 0.2s;
}

.track-progress:hover::-webkit-slider-thumb,
.track-progress:focus-visible::-webkit-slider-thumb,
.track-progress:hover::-moz-range-thumb,
.track-progress:focus-visible::-moz-range-thumb {
    opacity: 1;
}

.player-button {
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: #e9e8e4;
    cursor: pointer;
    transition: color 0.2s, background 0.2s, transform 0.2s;
}

.player-button:hover {
    transform: scale(1.12);
    background: rgba(255, 255, 255, 0.1);
}

.player-button:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

.player-button:disabled:hover {
    transform: none;
    background: transparent;
}

.player-button:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.player-button svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
}

.play-button {
    width: 34px;
    height: 34px;
    background: rgba(255, 255, 255, 0.12);
}

.play-button svg {
    width: 20px;
    height: 20px;
}

.play-button svg path {
    fill: currentColor;
    stroke: none;
}

.player-status {
    display: none;
    margin-top: 7px;
    color: #d0cfc9;
    font-size: 11px;
    line-height: 1.4;
}

.player-status.is-visible {
    display: block;
}


/* =========================
   5. KHUNG PROFILE
========================= */

.profile {
    position: relative;

    width: min(390px, 100%);

    display: flex;
    flex-direction: column;
    align-items: center;

    padding: 40px 34px 38px;

    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 24px;
    background:
        radial-gradient(ellipse at 50% 0, rgba(53, 63, 105, 0.12), transparent 58%),
        rgba(8, 9, 15, 0.88);
    box-shadow:
        0 28px 80px rgba(0, 0, 0, 0.52),
        inset 0 1px 0 rgba(255, 255, 255, 0.035);

    text-align: center;

    transform:
        perspective(1000px)
        rotateX(var(--tilt-y, 0deg))
        rotateY(var(--tilt-x, 0deg));
    transform-style: preserve-3d;
    transition: transform 180ms ease-out;

    animation: profile-appear 1.2s ease both;
}


/* =========================
   6. ẢNH ĐẠI DIỆN
========================= */

.avatar-wrapper {
    position: relative;

    width: 126px;
    height: 126px;

    margin-bottom: 24px;
}

.avatar-ring {
    position: absolute;

    inset: -5px;

    border: 2px solid rgba(112, 128, 255, 0.75);
    border-radius: 50%;

    box-shadow:
        0 0 12px rgba(91, 103, 255, 0.55),
        0 0 30px rgba(91, 103, 255, 0.25);

    animation: ring-glow 3s ease-in-out infinite alternate;
}

.avatar {
    position: relative;

    display: block;

    width: 100%;
    height: 100%;

    object-fit: cover;

    border: 2px solid rgba(255, 255, 255, 0.18);
    border-radius: 50%;

    background: #172b4b;
}

.name-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
}

.profile h1 {
    color: #f4f7ff;

    font-size: clamp(30px, 7vw, 36px);
    font-weight: 600;

    letter-spacing: -0.8px;

    text-shadow:
        0 2px 8px rgba(0, 0, 0, 0.7),
        0 0 22px rgba(255, 255, 255, 0.24);
}

.profile-badges {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: #7168ff;
}

.profile-badges svg {
    width: 19px;
    height: 19px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2;
    filter: drop-shadow(0 0 7px rgba(107, 97, 255, 0.5));
}

.profile-badges svg:nth-child(2) path:first-child {
    fill: currentColor;
    stroke: none;
}

.profile-badges svg:nth-child(2) path:last-child {
    stroke: #0c0d14;
}

.profile-caption {
    margin-top: 8px;
    color: #a9a9b5;
    font-size: 13px;
}

.profile-message {
    margin-top: 8px;
    color: #f5f5f7;
    font-size: 16px;
    font-weight: 600;
}

.description {
    max-width: 100%;

    margin-top: 6px;

    color: #bdbdc7;

    font-size: 13px;
    line-height: 1.6;

    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.7);
}


/* =========================
   8. MẠNG XÃ HỘI
========================= */

.socials {
    display: flex;
    justify-content: center;
    align-items: center;

    gap: 24px;

    margin-top: 35px;
}

.socials a {
    display: grid;
    place-items: center;

    width: 38px;
    height: 38px;

    color: #f4f4f7;

    text-decoration: none;

    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.25));

    transition:
        color 0.25s,
        transform 0.25s,
        filter 0.25s;
}

.socials svg {
    display: block;

    width: 36px;
    height: 36px;
}

.socials a:first-child {
    color: #5865f2;
}

.socials a:first-child svg path {
    fill: currentColor;
}

.socials a:nth-child(2) {
    color: #ff147b;
}

.socials a:nth-child(2) svg rect,
.socials a:nth-child(2) svg circle:not(.instagram-dot) {
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
}

.socials a:nth-child(2) svg .instagram-dot {
    fill: currentColor;
}

.socials a:nth-child(3) {
    color: #1ed760;
}

.socials .spotify-disc {
    fill: currentColor;
}

.socials a:nth-child(3) svg path {
    fill: none;
    stroke: #0b1010;
    stroke-linecap: round;
    stroke-width: 1.7;
}

.socials a:hover {
    color: #fff;

    transform: translateY(-5px);

    filter:
        drop-shadow(0 0 5px rgba(255, 255, 255, 0.6))
        drop-shadow(0 0 12px rgba(80, 160, 255, 0.8));
}

.socials a:focus-visible {
    outline: 2px solid white;
    outline-offset: 5px;
    border-radius: 5px;
}


/* =========================
   9. HIỆU ỨNG CHUYỂN ĐỘNG
========================= */

@keyframes profile-appear {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes entry-prompt {
    0%, 100% {
        opacity: 0.58;
    }

    50% {
        opacity: 0.82;
    }
}

@keyframes ring-glow {
    from {
        filter: hue-rotate(0deg);
        box-shadow:
            0 0 10px rgba(72, 157, 255, 0.65),
            0 0 22px rgba(72, 157, 255, 0.3);
    }

    to {
        filter: hue-rotate(25deg);
        box-shadow:
            0 0 15px rgba(72, 157, 255, 0.95),
            0 0 35px rgba(72, 157, 255, 0.6);
    }
}

@keyframes raindrop-fall {
    from {
        transform: translate3d(0, -30px, 0) rotate(8deg);
    }

    to {
        transform: translate3d(var(--drift), calc(100vh + 60px), 0) rotate(8deg);
    }
}

@keyframes firefly-drift {
    0% {
        opacity: 0;
        transform: translate3d(0, 0, 0);
    }

    12% {
        opacity: 0.95;
    }

    82% {
        opacity: 0.8;
    }

    100% {
        opacity: 0;
        transform: translate3d(var(--travel-x), var(--travel-y), 0);
    }
}

@keyframes firefly-glow {
    from {
        filter: brightness(0.7);
    }

    to {
        filter: brightness(1.5);
    }
}

@keyframes background-move {
    from {
        transform:
            translate3d(var(--pointer-x, 0px), var(--pointer-y, 0px), 0)
            scale(var(--pointer-scale, 1))
            scale(1.03)
            translateX(0);
    }

    to {
        transform:
            translate3d(var(--pointer-x, 0px), var(--pointer-y, 0px), 0)
            scale(var(--pointer-scale, 1))
            scale(1.1)
            translateX(-1%);
    }
}


/* =========================
   10. GIAO DIỆN ĐIỆN THOẠI
========================= */

@media (max-width: 480px) {
    body {
        padding: 35px 22px;
    }

    .profile {
        padding: 34px 24px 32px;
    }

    .audio-player {
        gap: 11px;
        min-height: 84px;
        padding: 11px;
    }

    .track-art {
        flex-basis: 48px;
        width: 48px;
        height: 48px;
    }

    .waveform {
        gap: 1.5px;
        width: 38px;
    }

    .waveform span {
        flex-basis: 1.8px;
    }

    .track-heading {
        margin-bottom: 6px;
    }

    .track-title {
        font-size: 13px;
    }

    .track-artist {
        display: none;
    }

    .player-controls {
        gap: 5px;
    }

    .time-display {
        font-size: 10px;
    }

    .player-button {
        width: 25px;
        height: 28px;
    }

    .play-button {
        width: 30px;
        height: 30px;
    }

    .avatar-wrapper {
        width: 108px;
        height: 108px;

        margin-bottom: 21px;
    }

    .profile h1 {
        font-size: 31px;
    }

    .description {
        font-size: 12px;
    }

    .socials {
        gap: 23px;
        margin-top: 31px;
    }

    .socials a {
        width: 32px;
        height: 32px;
    }

    .socials svg {
        width: 30px;
        height: 30px;
    }
}


/* =========================
   11. HẠN CHẾ CHUYỂN ĐỘNG
========================= */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}