/*
 * Template "Kartu Pos" (Save the Date): a vintage postcard on a writing desk.
 * Colors from the chosen variant: --inv-primary (ink, stamp), --inv-accent (airmail stripe, wax),
 * --inv-background (cream paper), --inv-text, --inv-desk (backdrop), --inv-gold (stamp detail).
 * Fonts: Yesteryear (hand-lettered title, names), Special Elite (typewriter), Caveat (handwriting).
 */

:root {
    --inv-primary: #1d3b78; --inv-accent: #c3302a; --inv-background: #f6ead0; --inv-text: #2b241e;
    --inv-desk: #12285a; --inv-gold: #c99634;
    --kp-script: 'Yesteryear', 'Brush Script MT', cursive;
    --kp-type: 'Special Elite', 'Courier New', monospace;
    --kp-hand: 'Caveat', 'Segoe Print', cursive;
    --kp-ink: color-mix(in srgb, var(--inv-primary) 82%, #000);
    /* paper grain (fractal noise) laid over every paper surface */
    --kp-grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .32 0 0 0 0 .22 0 0 0 0 .1 0 0 0 .3 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    /* the red / blue diagonal border of an airmail envelope */
    --kp-airmail: repeating-linear-gradient(-45deg,
        var(--inv-accent) 0 11px, var(--inv-background) 11px 18px,
        var(--inv-primary) 18px 29px, var(--inv-background) 29px 36px);
    /* perforated edge for stamps: holes in the padding ring, solid inside */
    --kp-perf: radial-gradient(circle 4.2px, #0000 96%, #000) -5px -5px / 10px 10px round;
}

*, *::before, *::after { box-sizing: border-box; }

html { background: var(--inv-desk); overflow-x: clip; }
body {
    margin: 0;
    min-height: 100vh;
    overflow-x: hidden;
    background:
        radial-gradient(38rem 30rem at 50% 8rem, color-mix(in srgb, var(--inv-primary) 70%, #fff 8%), transparent 70%),
        radial-gradient(30rem 24rem at 100% 100%, color-mix(in srgb, var(--inv-accent) 22%, transparent), transparent 70%),
        linear-gradient(180deg, var(--inv-desk), color-mix(in srgb, var(--inv-desk) 80%, #000));
    background-color: var(--inv-desk);
    color: var(--inv-text);
    font-family: var(--kp-type);
    font-size: 15px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}
/* faint desk grain */
body::before {
    content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none;
    background: var(--kp-grain); opacity: .22; mix-blend-mode: soft-light;
}

.kp-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

.kp-preview {
    position: sticky; top: 0; z-index: 60; padding: .5rem 1rem; text-align: center;
    background: #fff4d6; color: #6b4e00; font-family: system-ui, sans-serif; font-size: .8125rem;
}

.kp { position: relative; z-index: 1; max-width: 27rem; margin: 0 auto; padding: .5rem 1rem 0; }

/* shared typewriter label */
.kp-type { font-family: var(--kp-type); letter-spacing: .16em; text-transform: uppercase; font-size: .72rem; color: var(--kp-ink); }
.kp-type--muted { color: color-mix(in srgb, var(--inv-text) 55%, transparent); }
.kp-type--label { display: block; font-size: .66rem; letter-spacing: .22em; color: color-mix(in srgb, var(--inv-text) 70%, transparent); }

/* ---------- picture side ---------- */
.kp-front { position: relative; padding: 2rem .2rem 0; }
.kp-front__card { position: relative; rotate: -1.6deg; filter: drop-shadow(0 18px 22px rgb(0 0 0 / .42)) drop-shadow(0 2px 3px rgb(0 0 0 / .25)); }
/* white card with a deckled edge */
.kp-front__paper {
    position: absolute; inset: 0;
    background: var(--kp-grain), linear-gradient(160deg, #fffdf6, color-mix(in srgb, var(--inv-background) 55%, #fff));
    background-size: 180px 180px, auto;
    filter: url(#kp-deckle);
}
.kp-photo {
    position: relative; overflow: hidden;
    height: clamp(20rem, calc(100svh - 9.4rem), 37rem);
    margin: 0; border: 13px solid transparent; background-clip: padding-box;
    background-color: var(--inv-desk);
}
.kp-photo img {
    display: block; width: 100%; height: 100%; object-fit: cover; object-position: 50% 40%;
    filter: sepia(.14) saturate(1.08) contrast(1.04);
}
/* warm age tone + darker corners, and a scrim under the caption */
.kp-photo::after {
    content: ''; position: absolute; inset: 0; pointer-events: none;
    background:
        linear-gradient(180deg, transparent 52%, color-mix(in srgb, var(--inv-desk) 55%, transparent) 76%, color-mix(in srgb, var(--inv-desk) 92%, #000) 100%),
        radial-gradient(120% 90% at 50% 45%, transparent 60%, rgb(40 20 0 / .3));
}
.kp-photo > :not(img) { position: relative; z-index: 1; }

/* no photo: a sunburst like an old souvenir card, with big initials */
.kp-photo--empty {
    display: grid; place-items: center;
    background:
        radial-gradient(circle at 50% 42%, color-mix(in srgb, var(--inv-gold) 65%, #fff) 0 12%, transparent 46%),
        linear-gradient(170deg, var(--inv-primary), var(--inv-desk));
    background-clip: padding-box;
}
.kp-photo__rays {
    position: absolute !important; inset: -30%; opacity: .22;
    background: repeating-conic-gradient(from 0deg at 50% 42%, var(--inv-background) 0 6deg, transparent 6deg 15deg);
}
.kp-photo__initials {
    margin-top: -3.5rem;
    font-family: var(--kp-script); font-size: 6.2rem; line-height: 1; color: var(--inv-background);
    text-shadow: 3px 3px 0 var(--inv-accent), 6px 6px 0 color-mix(in srgb, var(--inv-desk) 80%, #000);
}
.kp-photo__initials em { font-style: normal; font-size: .55em; margin: 0 .08em; }

/* small typed card number in the top right corner of the picture */
.kp-photo__no {
    position: absolute !important; top: .7rem; right: .75rem;
    font-family: var(--kp-type); font-size: .62rem; letter-spacing: .2em; text-transform: uppercase;
    padding: .15rem .4rem; color: rgb(255 250 235 / .95); background: rgb(10 10 20 / .32);
    text-shadow: 0 1px 2px rgb(0 0 0 / .5);
}

/* names + date printed on the picture */
.kp-caption {
    position: absolute !important; left: 0; right: 0; bottom: 0;
    padding: 0 1rem 1rem; text-align: center; color: #fffaf0;
}
.kp-names {
    margin: 0;
    font-family: var(--kp-script); font-weight: 400;
    font-size: clamp(2.7rem, 13vw, 3.5rem); line-height: 1.02;
    text-shadow: 2px 2px 0 color-mix(in srgb, var(--inv-accent) 85%, #000), 0 3px 14px rgb(0 0 0 / .45);
    overflow-wrap: anywhere;
}
.kp-amp { font-size: .7em; color: color-mix(in srgb, var(--inv-gold) 55%, #fff); }
.kp-caption__date {
    display: inline-block; margin: .45rem 0 0; padding: .25rem .7rem .2rem;
    font-family: var(--kp-type); font-size: .78rem; letter-spacing: .2em; text-transform: uppercase;
    color: var(--inv-text); background: var(--inv-background);
    box-shadow: 0 2px 6px rgb(0 0 0 / .3);
}
.kp-caption__date i { font-style: normal; color: var(--inv-accent); }

/* hand-lettered title over the top left corner */
.kp-title {
    position: absolute; z-index: 2; left: .15rem; top: -1.05rem; margin: 0; max-width: 82%;
    font-family: var(--kp-script); font-size: clamp(2.3rem, 11vw, 2.9rem); line-height: .95;
    color: var(--inv-background); rotate: -9deg; transform-origin: 0 100%;
    text-shadow:
        2px 2px 0 var(--inv-accent), 4px 4px 0 var(--inv-accent),
        5px 5px 0 color-mix(in srgb, var(--inv-desk) 85%, #000), 0 6px 14px rgb(0 0 0 / .35);
}

/* ---------- message side ---------- */
.kp-back { position: relative; margin-top: 1.7rem; }
.kp-letter {
    position: relative; rotate: .9deg;
    padding: 12px; /* the airmail stripe ring */
    background: var(--kp-airmail);
    border-radius: 3px;
    box-shadow: 0 18px 30px -8px rgb(0 0 0 / .5), 0 2px 3px rgb(0 0 0 / .25);
}
/* cream paper inside the stripe ring */
.kp-letter::before {
    content: ''; position: absolute; inset: 12px; z-index: 0;
    background:
        var(--kp-grain),
        radial-gradient(130% 100% at 50% 40%, transparent 62%, color-mix(in srgb, var(--inv-gold) 18%, transparent)),
        var(--inv-background);
    background-size: 180px 180px, auto, auto;
}
.kp-letter > * { position: relative; z-index: 1; margin-left: 1rem; margin-right: 1rem; }

.kp-letter__head {
    display: flex; justify-content: space-between; align-items: baseline;
    padding: .85rem 0 .55rem; border-bottom: 1px solid color-mix(in srgb, var(--inv-primary) 35%, transparent);
}
.kp-letter__head .kp-type:first-child { font-size: .95rem; letter-spacing: .3em; }

.kp-letter__top { display: grid; grid-template-columns: 1fr auto; gap: .6rem; padding-top: .9rem; }
.kp-message { min-width: 0; padding-top: .1rem; }
.kp-message__date {
    margin: .25rem 0 0;
    font-family: var(--kp-hand); font-weight: 700; font-size: 1.85rem; line-height: 1.02; color: var(--kp-ink);
}
.kp-message__city {
    margin: .35rem 0 0;
    font-family: var(--kp-hand); font-weight: 600; font-size: 1.5rem; line-height: 1.1; color: var(--inv-accent);
    overflow-wrap: anywhere;
}
.kp-message__city .kp-type { font-size: .7rem; vertical-align: .25em; margin-right: .1em; }

/* postage: stamp + postmark */
.kp-postage { position: relative; width: 6.6rem; padding-bottom: 1.6rem; }
.kp-stamp {
    position: relative; width: 6.3rem; margin-left: auto; padding: 5px; rotate: 3deg;
    background: #fffaf0;
    -webkit-mask: linear-gradient(#000 0 0) content-box, var(--kp-perf);
    mask: linear-gradient(#000 0 0) content-box, var(--kp-perf);
    filter: drop-shadow(0 2px 2px rgb(0 0 0 / .25));
}
.kp-stamp__inner {
    display: flex; flex-direction: column; align-items: center;
    padding: .35rem .3rem .45rem; border: 4px solid #fffaf0;
    color: #fffaf0; text-align: center;
    background:
        repeating-linear-gradient(0deg, rgb(255 255 255 / .07) 0 1px, transparent 1px 3px),
        radial-gradient(circle at 50% 30%, color-mix(in srgb, var(--inv-primary) 70%, #fff 12%), var(--inv-primary) 70%);
}
.kp-stamp__country { font-family: var(--kp-type); font-size: .5rem; letter-spacing: .2em; text-transform: uppercase; opacity: .9; }
.kp-stamp__rings { width: 2.6rem; height: 1.6rem; margin-top: .15rem; fill: none; stroke: var(--inv-gold); stroke-width: 2.6; }
.kp-stamp__rings path { fill: var(--inv-gold); stroke: none; }
.kp-stamp__day { font-family: var(--kp-script); font-size: 2.4rem; line-height: .95; }
.kp-stamp__month { font-family: var(--kp-type); font-size: .58rem; letter-spacing: .14em; text-transform: uppercase; color: color-mix(in srgb, var(--inv-gold) 65%, #fff); }

.kp-postmark {
    position: absolute; left: -3.7rem; bottom: -.1rem; width: 9.6rem; height: auto; rotate: -8deg;
    color: var(--kp-ink); opacity: .78; overflow: visible; pointer-events: none;
}
.kp-postmark__ring { fill: none; stroke: currentColor; stroke-width: 2.2; }
.kp-postmark__ring--thin { stroke-width: 1.2; }
.kp-postmark__arc { font-family: var(--kp-type); font-size: 10px; letter-spacing: 2px; fill: currentColor; text-transform: uppercase; }
.kp-postmark__date { font-family: var(--kp-type); font-size: 15px; fill: currentColor; }
.kp-postmark__year { font-family: var(--kp-type); font-size: 10px; letter-spacing: 1.5px; fill: currentColor; }
.kp-postmark__wave { fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; }

.kp-note {
    margin-top: .9rem; margin-bottom: 0; padding: .55rem .75rem .6rem;
    font-family: var(--kp-hand); font-weight: 500; font-size: 1.32rem; line-height: 1.2; color: var(--inv-text);
    background: color-mix(in srgb, var(--inv-gold) 16%, transparent);
    border-left: 3px solid var(--inv-accent);
}

/* address on ruled lines */
.kp-address { margin-top: 1.1rem; padding-top: .8rem; border-top: 1px dashed color-mix(in srgb, var(--inv-primary) 40%, transparent); }
.kp-address__lines {
    --kp-rule: 2.15rem;
    margin-top: .1rem;
    background: repeating-linear-gradient(180deg, transparent 0 calc(var(--kp-rule) - 1px), color-mix(in srgb, var(--inv-primary) 45%, transparent) calc(var(--kp-rule) - 1px) var(--kp-rule));
}
.kp-address__name, .kp-address__line {
    display: block;
    font-family: var(--kp-hand); font-weight: 600; font-size: 1.55rem; line-height: var(--kp-rule);
    color: var(--kp-ink); overflow-wrap: anywhere; padding-left: .4rem;
}
.kp-address__line { font-weight: 500; color: color-mix(in srgb, var(--inv-text) 75%, transparent); }

.kp-zip { display: flex; align-items: center; justify-content: space-between; gap: .6rem; margin-top: .75rem; }
.kp-zip .kp-type--label { font-size: .6rem; }
.kp-zip__boxes { display: flex; gap: 3px; }
.kp-zip__boxes b {
    display: grid; place-items: center; width: 1.45rem; height: 1.75rem;
    font-family: var(--kp-hand); font-weight: 700; font-size: 1.3rem; line-height: 1; color: var(--inv-accent);
    border: 1.5px solid color-mix(in srgb, var(--inv-primary) 70%, transparent);
}
.kp-zip__boxes b:nth-child(2n) { margin-right: 4px; }
.kp-zip__boxes b:last-child { margin-right: 0; }

.kp-letter__from {
    margin-top: .9rem; margin-bottom: 0; padding: .4rem 0 1rem; text-align: right;
    font-family: var(--kp-script); font-size: 1.6rem; line-height: 1.1; color: var(--inv-accent);
}
.kp-letter__from .kp-type { font-size: .62rem; vertical-align: .35em; margin-right: .3em; color: color-mix(in srgb, var(--inv-text) 65%, transparent); }

/* ---------- countdown: a row of stamps ---------- */
.kp-countdown { padding: 2.4rem 0 .6rem; text-align: center; color: var(--inv-background); }
.kp-countdown__title {
    margin: 0 0 1rem; font-family: var(--kp-script); font-size: 2.1rem; line-height: 1;
    color: var(--inv-background); text-shadow: 2px 2px 0 color-mix(in srgb, var(--inv-accent) 80%, #000);
}
.kp-countdown .inv-countdown { gap: .55rem; }
.kp-countdown .inv-countdown__item {
    flex: 1; min-width: 0; max-width: 5.4rem; padding: 5px; border-radius: 0;
    background: #fffaf0;
    -webkit-mask: linear-gradient(#000 0 0) content-box, var(--kp-perf);
    mask: linear-gradient(#000 0 0) content-box, var(--kp-perf);
    filter: drop-shadow(0 3px 4px rgb(0 0 0 / .35));
}
.kp-countdown .inv-countdown__item:nth-child(odd) { rotate: -2.5deg; }
.kp-countdown .inv-countdown__item:nth-child(even) { rotate: 2deg; translate: 0 .25rem; }
.kp-countdown .inv-countdown__value {
    display: block; padding: .6rem 0 .1rem; border: 3px solid #fffaf0; border-bottom: 0;
    font-family: var(--kp-type); font-weight: 400; font-size: 1.7rem; line-height: 1.1; color: #fffaf0;
    background: var(--kp-stamp-c, var(--inv-primary));
}
.kp-countdown .inv-countdown__label {
    display: block; padding: .05rem 0 .4rem; border: 3px solid #fffaf0; border-top: 0;
    font-family: var(--kp-type); font-size: .58rem; letter-spacing: .18em; text-transform: uppercase;
    opacity: 1; color: color-mix(in srgb, #fff 82%, transparent);
    background: var(--kp-stamp-c, var(--inv-primary));
}
.kp-countdown .inv-countdown__item:nth-child(2) { --kp-stamp-c: var(--inv-accent); }
.kp-countdown .inv-countdown__item:nth-child(3) { --kp-stamp-c: color-mix(in srgb, var(--inv-gold) 80%, #4a2a00); }
.kp-countdown .inv-countdown__item:nth-child(4) { --kp-stamp-c: color-mix(in srgb, var(--inv-primary) 55%, var(--inv-desk)); }
.kp-countdown .inv-countdown__done { margin: 0; font-family: var(--kp-hand); font-size: 1.35rem; }
.kp-countdown .inv-countdown__actions { gap: .5rem; margin-top: 1.3rem; }
.kp-countdown .inv-button {
    padding: .55rem .9rem; border-radius: 2px;
    font-family: var(--kp-type); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase;
}
.kp-countdown .inv-button--outline {
    color: var(--inv-background); background: color-mix(in srgb, var(--inv-background) 6%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--inv-background) 60%, transparent);
}

/* ---------- closing: an envelope sealed in wax ---------- */
.kp-closing { padding: 2.4rem 0 2.6rem; }
.kp-envelope {
    position: relative; overflow: hidden;
    padding: 0 1.4rem 1.7rem;
    background:
        var(--kp-grain),
        /* the two lower folds of the envelope back */
        linear-gradient(to top right, transparent calc(50% - 1px), color-mix(in srgb, var(--inv-text) 14%, transparent) 50%, transparent calc(50% + 1px)) 0 100% / 50% 55% no-repeat,
        linear-gradient(to top left, transparent calc(50% - 1px), color-mix(in srgb, var(--inv-text) 14%, transparent) 50%, transparent calc(50% + 1px)) 100% 100% / 50% 55% no-repeat,
        var(--inv-background);
    background-size: 180px 180px, 50% 55%, 50% 55%, auto;
    border-radius: 4px;
    box-shadow: 0 20px 34px -10px rgb(0 0 0 / .55), inset 0 0 0 7px var(--inv-background), inset 0 0 0 9px color-mix(in srgb, var(--inv-accent) 70%, transparent);
    text-align: center;
}
.kp-envelope__flap {
    position: relative; display: block; height: 7.6rem; margin: 0 -1.4rem;
    filter: drop-shadow(0 4px 3px rgb(0 0 0 / .28));
}
.kp-envelope__flap::before {
    content: ''; position: absolute; inset: 0;
    background:
        var(--kp-grain),
        linear-gradient(180deg, color-mix(in srgb, var(--inv-background) 72%, var(--inv-gold)), color-mix(in srgb, var(--inv-background) 80%, var(--inv-text)));
    background-size: 180px 180px, auto;
    clip-path: polygon(0 0, 100% 0, 50% 100%);
}
/* airmail stripes along the top edge of the flap */
.kp-envelope::before {
    content: ''; position: absolute; left: 0; right: 0; top: 0; height: 9px; z-index: 1;
    background: var(--kp-airmail);
}
.kp-seal {
    position: absolute; left: 50%; top: calc(7.6rem - 2.4rem); z-index: 2;
    display: grid; place-items: center; width: 4.8rem; height: 4.6rem; translate: -50% 0;
    border-radius: 47% 53% 50% 46% / 52% 45% 55% 48%;
    background:
        radial-gradient(circle at 36% 30%, color-mix(in srgb, var(--inv-accent) 55%, #fff) 0 8%, transparent 36%),
        radial-gradient(circle at 50% 50%, var(--inv-accent) 0 52%, color-mix(in srgb, var(--inv-accent) 70%, #000) 72%);
    box-shadow: 0 4px 8px rgb(0 0 0 / .35), inset 0 -3px 6px rgb(0 0 0 / .25);
}
.kp-seal > span {
    display: flex; align-items: center; justify-content: center; width: 3.3rem; height: 3.3rem; border-radius: 50%;
    font-family: var(--kp-script); font-size: 1.45rem; line-height: 1; white-space: nowrap;
    color: color-mix(in srgb, var(--inv-accent) 72%, #000);
    background: radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--inv-accent) 92%, #000) 60%, color-mix(in srgb, var(--inv-accent) 80%, #fff) 100%);
    box-shadow: inset 0 2px 3px rgb(0 0 0 / .4), 0 1px 0 rgb(255 255 255 / .25);
    text-shadow: 0 1px 0 color-mix(in srgb, var(--inv-accent) 55%, #fff);
}
.kp-seal i { font-style: normal; font-size: .7em; }

.kp-envelope__body { position: relative; z-index: 1; padding-top: 2.8rem; }
.kp-closing__text {
    margin: 0 auto; max-width: 20rem;
    font-family: var(--kp-hand); font-weight: 500; font-size: 1.45rem; line-height: 1.22; color: var(--inv-text);
}
.kp-closing__names {
    margin: .85rem 0 0;
    font-family: var(--kp-script); font-size: 2.5rem; line-height: 1.05; color: var(--kp-ink);
}
.kp-closing__names span { color: var(--inv-accent); font-size: .7em; }

@media (min-width: 640px) {
    .kp { padding-top: 2.4rem; }
    .kp-photo { height: clamp(22rem, calc(100svh - 10rem), 36rem); }
}
@media (max-height: 600px) {
    .kp { padding-top: .2rem; }
    .kp-photo { height: clamp(18rem, calc(100svh - 6.5rem), 37rem); }
}

/*
 * Motion (only with html.inv-anim; see _shared/inv.css): the postcard drops onto the desk once,
 * the lettering follows (inv-enter). The message side turns over into view, the postmark is
 * stamped, and the wax seal is pressed when the envelope scrolls in.
 */
@keyframes kp-drop {
    from { opacity: 0; transform: translateY(-2.5rem) rotate(-7deg) scale(1.05); }
    60% { opacity: 1; }
    to { opacity: 1; transform: none; }
}
html.inv-anim .kp-front { animation: kp-drop 1.1s cubic-bezier(.2, .8, .25, 1) .1s both; }

html.inv-anim .kp-back[data-reveal="flip"]:not(.is-revealed) { opacity: 0; transform: perspective(1100px) rotateY(70deg); transform-origin: 50% 50%; }
html.inv-anim .kp-back[data-reveal] { transition-duration: .7s, 1.1s; transition-timing-function: ease, cubic-bezier(.2, .8, .25, 1); }

html.inv-anim .kp-postmark { transition: transform .45s cubic-bezier(.3, 1.6, .5, 1) .9s, opacity .35s ease .9s; }
html.inv-anim .kp-back:not(.is-revealed) .kp-postmark { transform: scale(1.5); opacity: 0; }

html.inv-anim .kp-seal { transition: transform .5s cubic-bezier(.3, 1.5, .5, 1) .45s, opacity .3s ease .45s; }
html.inv-anim .kp-closing:not(.is-revealed) .kp-seal { transform: scale(1.5); opacity: 0; }