:root {
    --ink: #392331;
    --pink: #ff7eaa;
    --rose: #ff4f88;
    --paper: #fff7fb;
    --cream: #fffdf7;
    --blue: #87d6ff;
    --mint: #8be8c3;
    --shadow: rgba(98, 38, 65, 0.24);
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    overflow: hidden;
    color: var(--ink);
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 126, 170, 0.22), transparent 28%),
        radial-gradient(circle at 80% 18%, rgba(135, 214, 255, 0.3), transparent 24%),
        linear-gradient(135deg, #ffe2ed 0%, #fffdf7 48%, #d8f7ff 100%);
    font-family: "Pixelify Sans", system-ui, sans-serif;
}

main {
    width: min(100%, 980px);
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 22px;
}

.screen {
    display: none;
    width: 100%;
    justify-items: center;
    text-align: center;
}

.screen.is-visible {
    display: grid;
}

#envelope-container p {
    margin: 28px 0 0;
    font-size: clamp(2rem, 8vw, 3.25rem);
    text-shadow: 0 3px 0 rgba(255, 255, 255, 0.8);
}

.envelope-button {
    width: min(58vw, 250px);
    aspect-ratio: 1.28;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: pointer;
    filter: drop-shadow(0 16px 22px var(--shadow));
    animation: pulse 1.6s ease-in-out infinite;
}

.envelope {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    background: linear-gradient(145deg, #ff90b8, #ff5b92);
    overflow: hidden;
}

.envelope::before,
.envelope::after {
    content: "";
    position: absolute;
    inset: auto 0 0;
    width: 0;
    height: 0;
    border-bottom: min(29vw, 125px) solid #ff74a4;
}

.envelope::before {
    left: 0;
    border-right: min(58vw, 250px) solid transparent;
}

.envelope::after {
    right: 0;
    border-left: min(58vw, 250px) solid transparent;
}

.envelope-flap {
    position: absolute;
    inset: 0;
    width: 0;
    height: 0;
    border-left: min(29vw, 125px) solid transparent;
    border-right: min(29vw, 125px) solid transparent;
    border-top: min(25vw, 108px) solid #ffabc8;
    transform-origin: top center;
}

.envelope-heart {
    position: absolute;
    inset: 50% auto auto 50%;
    z-index: 2;
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    transform: translate(-50%, -36%);
    border-radius: 999px;
    background: var(--cream);
    color: var(--rose);
    font-family: "Aldrich", sans-serif;
    font-size: 2rem;
}

.letter-screen {
    align-items: center;
}

.letter-window {
    width: min(94vw, 760px);
    min-height: min(82vh, 620px);
    display: grid;
    place-items: center;
    padding: clamp(18px, 4vw, 36px);
    border: 4px solid #2d2532;
    border-radius: 8px;
    background:
        linear-gradient(var(--paper), var(--paper)) padding-box,
        linear-gradient(90deg, var(--pink), var(--blue), var(--mint)) border-box;
    box-shadow: 0 22px 50px var(--shadow);
    opacity: 0;
    transform: translateY(20px) scale(0.96);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.letter-window.open {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.letter-content {
    width: min(100%, 580px);
    display: grid;
    justify-items: center;
    gap: clamp(12px, 2.6vw, 18px);
}

.tiny-note {
    margin: 0;
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: #8a4b68;
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 7vw, 3.2rem);
    line-height: 1;
}

.love-letter,
.poem,
.date-note {
    margin: 0;
    font-size: clamp(1.05rem, 3.9vw, 1.45rem);
    line-height: 1.45;
}

.love-letter {
    max-width: 48ch;
}

.cat {
    position: relative;
    width: clamp(116px, 32vw, 180px);
    aspect-ratio: 1.1;
    animation: floaty 2.4s ease-in-out infinite;
}

.cat.happy {
    animation: happyDance 0.42s ease-in-out infinite;
}

.cat-face {
    position: absolute;
    inset: 18% 8% 8%;
    border: 4px solid #2d2532;
    border-radius: 46% 46% 42% 42%;
    background: var(--cream);
}

.cat-ear {
    position: absolute;
    top: 7%;
    width: 34%;
    aspect-ratio: 1;
    border: 4px solid #2d2532;
    background: var(--cream);
    transform: rotate(45deg);
}

.cat-ear.left {
    left: 15%;
}

.cat-ear.right {
    right: 15%;
}

.cat-eye {
    position: absolute;
    top: 36%;
    width: 13%;
    aspect-ratio: 1;
    border-radius: 999px;
    background: #2d2532;
}

.cat-eye.left {
    left: 28%;
}

.cat-eye.right {
    right: 28%;
}

.cat-mouth {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translateX(-50%);
    font-family: "Aldrich", sans-serif;
    font-size: clamp(1.2rem, 4vw, 1.8rem);
}

.cat-heart {
    position: absolute;
    right: -6%;
    top: 16%;
    display: grid;
    place-items: center;
    width: 44px;
    aspect-ratio: 1;
    border-radius: 999px;
    background: var(--rose);
    color: white;
    font-family: "Aldrich", sans-serif;
    font-size: 1.8rem;
    animation: heartBeat 1s ease-in-out infinite;
}

.buttons {
    position: relative;
    min-height: 68px;
    display: flex;
    justify-content: center;
    gap: clamp(16px, 6vw, 36px);
}

.choice-btn {
    min-width: 108px;
    min-height: 54px;
    padding: 10px 20px;
    border: 3px solid #2d2532;
    border-radius: 8px;
    color: var(--ink);
    background: var(--cream);
    box-shadow: 0 6px 0 #2d2532;
    font-family: inherit;
    font-size: clamp(1.25rem, 4vw, 1.7rem);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.choice-btn:active {
    transform: translateY(4px);
    box-shadow: 0 2px 0 #2d2532;
}

.yes-btn {
    background: #b8f4dc;
}

.no-btn {
    background: #ffd1df;
}

.final-message {
    display: grid;
    gap: 12px;
    padding: clamp(14px, 3vw, 22px);
    border: 3px dashed rgba(57, 35, 49, 0.45);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.68);
}

.answer {
    margin: 0;
    color: var(--rose);
    font-size: clamp(2rem, 8vw, 3.2rem);
    line-height: 1;
}

.date-note {
    color: #74445a;
}

.heart,
.confetti {
    position: fixed;
    top: -20px;
    left: 0;
    z-index: 10;
    pointer-events: none;
}

.heart {
    color: var(--rose);
    font-family: "Aldrich", sans-serif;
    font-size: 26px;
    animation: fallHeart 4.6s linear forwards;
}

.confetti {
    width: 12px;
    height: 18px;
    border-radius: 2px;
    animation: confettiDrop 1.9s ease-out forwards;
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.08);
    }
}

@keyframes floaty {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

@keyframes happyDance {
    0%,
    100% {
        transform: rotate(-5deg) translateY(0);
    }
    50% {
        transform: rotate(5deg) translateY(-8px);
    }
}

@keyframes heartBeat {
    0%,
    100% {
        transform: scale(1);
    }
    35% {
        transform: scale(1.18);
    }
}

@keyframes fallHeart {
    from {
        transform: translate3d(var(--x), -30px, 0) rotate(0deg);
        opacity: 0;
    }
    12% {
        opacity: 1;
    }
    to {
        transform: translate3d(calc(var(--x) + var(--drift)), 105vh, 0) rotate(220deg);
        opacity: 0;
    }
}

@keyframes confettiDrop {
    from {
        transform: translate3d(var(--x), var(--y), 0) rotate(0deg);
        opacity: 1;
    }
    to {
        transform: translate3d(calc(var(--x) + var(--drift)), 105vh, 0) rotate(480deg);
        opacity: 0;
    }
}

@media (max-width: 560px) {
    body {
        overflow: auto;
    }

    main {
        min-height: 100svh;
        padding: 14px;
    }

    .letter-window {
        min-height: auto;
        padding: 18px 14px;
    }

    .buttons {
        min-height: 120px;
        flex-wrap: wrap;
        align-items: center;
    }

    .choice-btn {
        min-width: 98px;
    }
}