:root {
    /* Times New Roman viene instalada en iOS, macOS y Windows; en Android cae a la serif del sistema */
    --serif: "Times New Roman", Times, serif;
}

html,
body {
    overflow: hidden;
    padding: 0;
    margin: 0;
    background: #000;
    overscroll-behavior: none;
    touch-action: manipulation;
    -webkit-touch-callout: none;
}

.container {
    position: fixed;
    inset: 0;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
}

/* Capa de luciérnagas: encima de las flores pero sin bloquear los clics */
#fireflies {
    pointer-events: none;
    mix-blend-mode: screen;
}

/* ------------------------------------------------------------
   Botones circulares semitransparentes
   ------------------------------------------------------------ */
.ui-btn {
    position: fixed;
    z-index: 3;
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 50%;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    cursor: pointer;
    opacity: .6;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: opacity .2s, background .2s, transform .15s;
}

.ui-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, .22);
}

.ui-btn:active {
    transform: scale(.92);
}

.ui-btn:focus-visible {
    opacity: 1;
    outline: 2px solid rgba(255, 255, 255, .8);
    outline-offset: 3px;
}

.ui-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
    filter: drop-shadow(0 0 4px rgba(0, 0, 0, .5));
}

/* Abajo a la izquierda: limpiar */
.clean-btn {
    left: calc(24px + env(safe-area-inset-left));
    bottom: calc(20px + env(safe-area-inset-bottom));
}

/* Abajo a la derecha: play / pausa */
.play-btn {
    right: calc(24px + env(safe-area-inset-right));
    bottom: calc(20px + env(safe-area-inset-bottom));
}

.play-btn .icon-play {
    /* el triángulo se ve más centrado un pelín a la derecha */
    transform: translateX(1px);
}

.play-btn .icon-pause,
body.playing .play-btn .icon-play {
    display: none;
}

body.playing .play-btn .icon-pause {
    display: block;
}

/* Arriba: información (izquierda) y carta (derecha), más pequeños */
.info-btn,
.letter-btn {
    top: calc(20px + env(safe-area-inset-top));
    width: 36px;
    height: 36px;
}

.info-btn {
    left: calc(24px + env(safe-area-inset-left));
}

.letter-btn {
    right: calc(24px + env(safe-area-inset-right));
}

.info-btn svg,
.letter-btn svg {
    width: 16px;
    height: 16px;
}

.letter-btn svg {
    width: 18px;
    height: 18px;
}

/* Popup con el nombre de la canción */
.song-info {
    position: fixed;
    z-index: 3;
    top: calc(20px + env(safe-area-inset-top));
    left: calc(24px + 36px + 10px + env(safe-area-inset-left));
    max-width: calc(100vw - 24px - 36px - 10px - 16px - env(safe-area-inset-left) - env(safe-area-inset-right));
    height: 36px;
    box-sizing: border-box;
    padding: 0 14px;
    display: flex;
    align-items: center;
    color: white;
    font-family: var(--serif);
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: 0 0 6px rgba(0, 0, 0, .6);
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 18px;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-6px);
    transition: opacity .25s, transform .25s, visibility 0s .25s;
}

.song-info.show {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: opacity .25s, transform .25s;
}

/* ------------------------------------------------------------
   Letra: una línea a la vez, en la parte inferior
   ------------------------------------------------------------ */
.lyrics {
    position: fixed;
    z-index: 2;
    left: 0;
    right: 0;
    /* justo encima de la fila de botones de abajo */
    bottom: calc(84px + env(safe-area-inset-bottom));
    height: 0;
    color: white;
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(19px, min(6vw, 4.8vh), 34px);
    line-height: 1.35;
    letter-spacing: .01em;
    text-align: center;
    text-shadow: 0 1px 10px rgba(0, 0, 0, .9), 0 0 24px rgba(255, 215, 120, .3);
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    opacity: 0;
    transition: opacity .5s ease;
}

body.playing .lyrics {
    opacity: 1;
}

/* Todas las líneas están apiladas en el mismo sitio; solo la activa se ve.
   Están ancladas abajo, así que si una línea ocupa dos renglones crece hacia arriba.
   Cada línea lleva un fondo de "cristal" oscuro y translúcido (mismo estilo que los botones)
   que se ajusta al ancho del texto, para poder leerla aunque haya muchas flores detrás. */
.line {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    width: fit-content;
    max-width: calc(100% - 2 * max(6vw, 16px));
    margin: 0 auto;
    padding: .3em .85em .35em;
    box-sizing: border-box;
    background: rgba(10, 8, 18, .4);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 18px;
    box-shadow: 0 0 22px rgba(0, 0, 0, .35);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    text-wrap: balance;
    /* al salir, se va rápido para dejar sitio a la siguiente */
    transition: opacity .35s ease, transform .35s ease, visibility 0s .35s;
}

.line.on {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: opacity .7s ease .2s, transform .7s ease .2s;
}

@media (prefers-reduced-motion: reduce) {
    .line {
        transform: none;
    }
}

/* ------------------------------------------------------------
   Modal de la carta
   ------------------------------------------------------------ */
[hidden] {
    display: none !important;
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
    font-family: var(--serif);
    visibility: hidden;
    opacity: 0;
    transition: opacity .25s ease, visibility 0s .25s;
}

.modal.open {
    visibility: visible;
    opacity: 1;
    transition: opacity .25s ease;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, .6);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.modal-card {
    position: relative;
    width: 100%;
    max-width: 560px;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 44px 24px 24px;
    color: #f6efe4;
    background: rgba(20, 16, 26, .92);
    border: 1px solid rgba(255, 255, 255, .18);
    border-radius: 18px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .6);
    transform: translateY(10px) scale(.98);
    transition: transform .3s ease;
}

.modal.open .modal-card {
    transform: none;
}

.modal-close {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, .8);
    background: transparent;
    border: 0;
    border-radius: 50%;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.modal-close:hover {
    background: rgba(255, 255, 255, .12);
}

.modal-close:focus-visible {
    outline: 2px solid rgba(255, 255, 255, .8);
}

.modal-close svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
}

/* --- Paso 1: contraseña --- */
.letter-lock {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.letter-lock h2 {
    margin: 0;
    font-size: 28px;
    font-weight: 400;
}

.lock-hint {
    margin: 0 0 4px;
    font-size: 18px;
    color: rgba(246, 239, 228, .75);
}

.letter-lock input {
    width: 100%;
    max-width: 260px;
    box-sizing: border-box;
    padding: 12px 14px;
    /* 16px o más evita que Safari haga zoom al enfocar */
    font: 24px var(--serif);
    letter-spacing: .35em;
    text-align: center;
    color: #fff;
    background: rgba(255, 255, 255, .08);
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 12px;
    outline: none;
}

.letter-lock input::placeholder {
    color: rgba(255, 255, 255, .3);
}

.letter-lock input:focus {
    border-color: rgba(255, 214, 120, .8);
    box-shadow: 0 0 0 3px rgba(255, 214, 120, .2);
}

.letter-lock input.shake {
    animation: shake .4s ease;
}

@keyframes shake {
    20% {
        transform: translateX(-8px);
    }

    40% {
        transform: translateX(7px);
    }

    60% {
        transform: translateX(-5px);
    }

    80% {
        transform: translateX(3px);
    }
}

.lock-error {
    min-height: 1.3em;
    margin: 0;
    font-size: 17px;
    color: #ff9d9d;
}

.lock-submit {
    padding: 11px 32px;
    font: 19px var(--serif);
    color: #221a08;
    background: #e8c15a;
    border: 0;
    border-radius: 999px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.lock-submit:hover {
    background: #f0cf72;
}

.lock-submit:active {
    transform: scale(.96);
}

/* --- Paso 2: la carta --- */
.letter {
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    /* el espacio de arriba/abajo deja que el texto se difumine suavemente en los bordes al desplazarse */
    padding: 14px 0 34px;
    font-size: clamp(18px, 4.9vw, 21px);
    line-height: 1.75;
    text-align: left;
    -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 14px, #000 calc(100% - 30px), transparent 100%);
    mask-image: linear-gradient(to bottom, transparent 0, #000 14px, #000 calc(100% - 30px), transparent 100%);
}

/* Sin barra de desplazamiento visible, pero se sigue pudiendo hacer scroll
   (con el dedo en el móvil, con la rueda o con dos dedos en el trackpad) */
.letter {
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* Edge/IE antiguos */
}

.letter::-webkit-scrollbar {
    display: none;
    /* Chrome, Safari, Edge, Opera */
    width: 0;
    height: 0;
}

.letter>* {
    margin: 0 0 1.1em;
}

/* Saludo */
.letter .salutation {
    margin-bottom: 1.2em;
    font-size: 1.25em;
    font-weight: 700;
    color: #f0d590;
}

/* Frase que abre una parte */
.letter .lead {
    font-style: italic;
    font-size: 1.06em;
    color: #f0d590;
}

/* Frase destacada */
.letter .emph {
    padding-left: 1em;
    border-left: 2px solid rgba(232, 193, 90, .65);
    font-style: italic;
    font-size: 1.08em;
    color: #fff;
}

/* Frases cortas seguidas, como versos */
.letter .stack {
    padding-left: .2em;
    line-height: 1.6;
}

.letter .stack .l {
    display: block;
    margin-bottom: .3em;
}

.letter .aside {
    text-align: center;
    font-style: italic;
    color: rgba(246, 239, 228, .9);
}

/* La frase más importante */
.letter .key {
    margin: 1.5em 0;
    text-align: center;
    font-size: 1.3em;
    font-weight: 700;
    line-height: 1.4;
    color: #f3d47a;
    text-shadow: 0 0 18px rgba(232, 193, 90, .35);
}

.letter .signature {
    margin-top: 1.6em;
    text-align: right;
    font-style: italic;
}

/* Separador entre partes: una línea dorada que se desvanece, con un punto al centro */
.letter .divider {
    position: relative;
    width: 55%;
    height: 1px;
    margin: 2.1em auto;
    background: linear-gradient(90deg, transparent, rgba(232, 193, 90, .55), transparent);
}

.letter .divider::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 5px;
    height: 5px;
    background: #e8c15a;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 8px rgba(232, 193, 90, .8);
}

/* Cada bloque aparece con suavidad al llegar a él (lo activa main.js) */
.letter.reveal>* {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity .7s ease, transform .7s ease;
}

.letter.reveal>.in {
    opacity: 1;
    transform: none;
}