/* =========================================================================
   Tema Sailaway — perahu pembawa surat di danau berkabut, lukisan cat air.

   Titik tolaknya video pembuka bergaya cat air: perahu kayu kecil membawa
   surat berpita merah di danau berkabut pagi; perahu merapat ke dermaga,
   pita terlepas, surat terbuka dan berdiri tinggi di atas air — kartu krem
   bertepi sobek dengan bingkai emas LONJONG yang dirambati mawar.

   Gagasan utama: SURAT BERPITA. Isi = kartu kertas cat air bertepi sobek
   dengan bingkai emas lonjong tipis di dalamnya (persis surat di video);
   kepala bagian = simpul pita merah; foto mempelai & foto galeri pertama
   berbentuk lonjong.
   Warna: merah pita (utama), krem kertas, biru danau, hijau daun, emas.
   Huruf: Petit Formal Script (nama & judul), Cormorant Infant (sub judul),
   Nunito Sans (teks).
   ========================================================================= */

:root {
    --c-paper: #FBF6EC;
    --c-ink: #343A40;
    --c-accent: #9B4049;

    --c-muted: color-mix(in srgb, var(--c-ink) 72%, #fff);
    --c-rule: color-mix(in srgb, var(--slw-gold) 45%, #fff);
    --c-sunk: color-mix(in srgb, var(--slw-rose) 14%, #fff);
    --c-action: var(--c-accent);

    --f-names: 'Petit Formal Script', cursive;
    --f-display: 'Cormorant Infant', 'Cormorant Garamond', Georgia, serif;
    --f-body: 'Nunito Sans', system-ui, sans-serif;
    --f-script: var(--f-names);

    --slw-gold: #C29F62;   /* lis emas bingkai lonjong */
    --slw-rose: #E6A7A7;   /* mawar di bingkai */
    --slw-leaf: #8FA387;   /* daun */
    --slw-lake: #7F9AAE;   /* biru danau */
    --slw-ribbon: #9B3A44; /* pita pengikat surat */
    --slw-sheet: #FBF6EC;  /* kertas surat */
    --slw-ivory: #FFFDF8;
    /* Video 496 × 864 (31:54). Ponsel: menutupi layar. Layar lebar: utuh setinggi layar. */
    --slw-w: max(100vw, 100dvh * 31 / 54);
}
@media (min-aspect-ratio: 3 / 4) {
    :root { --slw-w: calc(100dvh * 31 / 54); }
}

body.inv.slw {
    background: #C9D3D6; color: var(--c-ink);
    font-family: var(--f-body); font-size: .92rem; line-height: 1.75;
}
.slw-amp { font-family: var(--f-display); font-style: italic; color: var(--slw-gold); }

/* ---------------------------------------------------------- latar isi */

/* Danau berkabut dengan dermaga & dedalu (awal video), dilembutkan; surat di atasnya. */
.slw-lake {
    position: fixed; inset: 0; z-index: 0; pointer-events: none;
    background: linear-gradient(rgb(251 246 236 / .25), rgb(251 246 236 / .4)), var(--slw-danau) center 35% / cover no-repeat, #C9D3D6;
}

/* ---------------------------------------------------------------- sampul */

.slw .inv-cover.slw-cover { padding: 0; display: block; overflow: hidden; background: #C9D3D6; }
.slw-stage {
    position: absolute; left: 50%; top: 50%;
    width: var(--slw-w); aspect-ratio: 31 / 54; transform: translate(-50%, -50%);
    container-type: inline-size; overflow: hidden;
}
.slw-stage__poster, .slw-stage__start, .slw-stage__video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* --- Sampul dua langkah (kelas dari theme.js) -------------------------
   diam       : bingkai pertama video + sapaan + tombol "Buka undangan"
   .is-playing: video berjalan, sapaan memudar
   .is-ready  : nama, tanggal & jadwal masuk bingkai lengkung; tombol "Lihat undangan" */
.slw-stage__video { opacity: 0; }
.slw-stage.is-playing .slw-stage__video { opacity: 1; }
.slw-stage__start { transition: opacity .3s ease .25s; }
.slw-stage.is-playing .slw-stage__start, .slw-stage.is-ready .slw-stage__start { opacity: 0; }

.slw-cover__text, .slw-cover__foot { transition: opacity 1.1s ease, transform 1.1s var(--ease), visibility 0s linear 0s; }
.slw-stage:not(.is-ready) .slw-cover__text { opacity: 0; visibility: hidden; transform: translateY(12px); transition-duration: .3s, .3s, 0s; transition-delay: 0s, 0s, .3s; }
.slw-stage.is-playing:not(.is-ready) .slw-cover__foot { opacity: 0; visibility: hidden; transform: translateY(10px); transition-duration: .5s, .5s, 0s; transition-delay: 0s, 0s, .5s; }
.slw-stage.is-ready .slw-cover__foot { transition-delay: .7s, .7s, 0s; }
.slw-stage:not(.is-ready) #inv-open, .slw-stage.is-ready .slw-play, .slw-cover__foot [hidden] { display: none; }

/* Sebelum surat terbuka (diam & selama video): sapaan di atas air tenang,
   di atas perahu. Baru pindah ke tepi bawah surat saat .is-ready — ketika
   sapaan sudah tak terlihat — jadi tidak ada lompatan. */
.slw-stage:not(.is-ready) .slw-cover__foot { top: 60cqw; bottom: auto; }

/* Surat di akhir video: kartu x 19–82%, y 14–161cqw; bingkai emas lonjong
   di dalamnya x 26–75% (tengah 50%), y 21–155cqw. Rangkaian mawar menutup
   puncak bingkai sampai ±52cqw dan dasarnya mulai ±118cqw. Kotak teks
   dijaga di bidang kertas yang bebas mawar & ukiran sisi bingkai. */
.slw-cover__text {
    position: absolute; left: 30cqw; width: 40cqw; top: 54cqw; height: 62cqw;
    display: flex; flex-direction: column; align-items: center; justify-content: safe center; gap: 1.2cqw;
    text-align: center;
}
.slw-cover__label { margin: 0; font: italic 400 3.4cqw/1.3 var(--f-display); letter-spacing: .03em; white-space: nowrap; color: #8B7A55; }
.slw-cover__names {
    display: grid; justify-items: center; width: 100%; margin: 0;
    font: 400 8.6cqw/1.3 var(--f-names); color: #8D3F49; text-wrap: balance;
}
.slw-cover__names .slw-amp { font-size: .55em; line-height: 1.3; color: #9C7B45; }
.slw-cover__date {
    margin: .6cqw 0 0; padding-top: 1.6cqw; border-top: 1px solid var(--slw-gold);
    font: 500 3.6cqw/1.2 var(--f-display); letter-spacing: .04em; white-space: nowrap; color: var(--c-ink);
}
/* Halaman lapang: jadwal boleh dua kolom. */
.slw-cover__sched { display: flex; flex-wrap: wrap; justify-content: center; gap: .8cqw 3.5cqw; max-width: 38cqw; margin: .2cqw 0 0; }
.slw-cover__sched p { display: grid; justify-items: center; margin: 0; font: 400 2.3cqw/1.35 var(--f-body); color: var(--c-muted); text-align: center; }
.slw-cover__sched-title { font: 600 2.1cqw/1.4 var(--f-body); letter-spacing: .1em; text-transform: uppercase; color: #8D3F49; }

.slw-cover__foot {
    /* Langkah akhir: menempel di bawah layar (di meja, di bawah kartu).
       Diukur dari bawah karena tinggi tombol dalam rem. Bila panggung video
       lebih tinggi dari layar (tablet potret), bagian bawahnya terpotong —
       geser naik sebesar potongan itu supaya tombol tetap terlihat. */
    position: absolute; left: 19cqw; width: 62cqw;
    bottom: calc(max(0px, (var(--slw-w) * 54 / 31 - 100dvh) / 2) + 1.6cqw);
    display: grid; justify-items: center; padding: 2.8cqw 4cqw 3.4cqw; border-radius: 1.4cqw; text-align: center;
    background: rgb(251 246 236 / .82); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
    border-radius: 4cqw; box-shadow: 0 0 0 1px rgb(194 159 98 / .55), inset 0 0 0 4px rgb(251 246 236 / .5), inset 0 0 0 5px rgb(194 159 98 / .3), 0 16px 30px -18px rgb(40 55 70 / .5);
}
.slw-cover__to { margin: 0; font-size: max(.72rem, 2.8cqw); color: var(--c-muted); }
.slw-cover__guest { max-width: 100%; margin: .1rem 0 0; font: 400 max(1.15rem, 5.2cqw)/1.25 var(--f-display); color: var(--c-ink); overflow-wrap: anywhere; }

/* Tombol sampul: merah pita, berlis emas tipis. */
.slw-open {
    margin-top: max(.6rem, 2.4cqw); padding: .8rem 1.8rem; border: 0; border-radius: 999px;
    background: var(--c-accent); color: var(--slw-ivory);
    font: 600 .88rem/1 var(--f-body); letter-spacing: .03em; white-space: nowrap; cursor: pointer;
    box-shadow: inset 0 0 0 1px rgb(255 255 255 / .2), 0 0 0 3px rgb(251 246 236 / .9), 0 0 0 4px var(--slw-gold), 0 10px 22px -12px rgb(40 55 70 / .5);
    transition: background .25s ease;
}
.slw-open:hover { background: var(--c-ink); }
.slw-open:focus-visible { outline: 2px solid var(--c-ink); outline-offset: 6px; }

/* ---------------------------------------------------------------- isi */

body.slw:not(.is-open) .slw-main { visibility: hidden; opacity: 0; }
body.slw.is-open .slw-main { animation: slw-fade 1s ease both .3s; }
@keyframes slw-fade { from { opacity: 0; } }

.slw .inv__main.slw-main {
    position: relative; z-index: 1;
    width: min(100% - 2rem, 30rem); max-width: none; margin: 0 auto; padding: 24vh 0 0;
}

/* Surat berbingkai lonjong: kertas cat air krem bertekstur (kertas.jpg dari
   surat di video, dicerahkan) bersudut tajam, dengan
   bingkai emas LONJONG tipis di dalamnya (::after). */
.slw .inv-section {
    position: relative; margin: 0 0 13vh; padding: 4.4rem 2.1rem 4rem;
    border: 0; border-radius: 0; text-align: center;
    background:
        linear-gradient(rgb(253 250 243 / .72), rgb(253 250 243 / .72)),
        url('kertas.jpg') center / cover,
        var(--slw-sheet);
    box-shadow: inset 0 0 36px rgb(214 190 150 / .45), 0 1px 0 rgb(255 255 255 / .7) inset, 0 22px 40px -24px rgb(40 55 70 / .5);
}
.slw .inv-section::after {
    content: ''; position: absolute; inset: 14px; pointer-events: none;
    border: 1.5px solid color-mix(in srgb, var(--slw-gold) 80%, transparent);
    border-radius: min(9rem, 40%) / min(7rem, 14%);
    box-shadow: inset 0 0 0 3px color-mix(in srgb, var(--slw-sheet) 60%, transparent), inset 0 0 0 4px color-mix(in srgb, var(--slw-gold) 30%, transparent);
}

/* Kepala bagian: simpul pita merah */
.slw-head { margin-bottom: 1.3rem; text-align: center; }
.slw-head__bow { display: block; width: 5.2rem; height: auto; margin: 0 auto .35rem; overflow: visible; }
.slw-head__line { fill: none; stroke: var(--slw-gold); stroke-width: 1; stroke-linecap: round; }
.slw-head__loop, .slw-head__tail { fill: var(--slw-ribbon); }
.slw-head__loop { stroke: color-mix(in srgb, var(--slw-ribbon) 70%, #000); stroke-width: .6; }
.slw-head__knot { fill: color-mix(in srgb, var(--slw-ribbon) 80%, #000); }
.slw-head__title { margin: 0; font: 400 clamp(1.6rem, 6.6vw, 1.95rem)/1.45 var(--f-names); color: var(--c-accent); }
.slw-head__lead { max-width: 24rem; margin: .5rem auto 0; color: var(--c-muted); }

/* Pembuka */
.slw .inv-bismillah { color: var(--c-accent); }
.slw-verse { margin: 0 0 1.5rem; }
.slw-verse__text { margin: 0; font: 400 1.18rem/1.7 var(--f-display); color: var(--c-ink); }
.slw-verse__source { margin-top: .6rem; font: 400 .95rem/1.3 var(--f-display); letter-spacing: .12em; color: var(--c-accent); }
.slw-lede { max-width: 25rem; margin: 0 auto; color: var(--c-muted); }

/* Mempelai: foto lonjong berlis emas ganda (bingkai surat di video) */
.slw-couple__grid { display: grid; gap: .5rem; }
.slw-couple__amp { margin: .3rem 0; font: italic 400 2.2rem/1 var(--f-display); color: var(--slw-gold); }
.slw-person { display: grid; justify-items: center; }
.slw-photo {
    width: 9rem; aspect-ratio: 3 / 4.2; margin: .4rem 0 1.4rem; padding: 6px; border-radius: 50%;
    border: 1px solid var(--slw-gold); outline: 1px solid color-mix(in srgb, var(--slw-gold) 45%, transparent); outline-offset: 5px;
    box-shadow: 0 12px 24px -16px rgb(40 55 70 / .5);
}
.slw-photo img, .slw-photo__initial { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.slw-photo__initial { display: grid; place-items: center; background: var(--c-sunk); font: 400 4.5rem/1 var(--f-names); color: var(--c-accent); }
.slw-person__text { min-width: 0; overflow-wrap: break-word; }
.slw-person__name { margin: 0; font: 400 1.6rem/1.45 var(--f-names); color: var(--c-accent); }
.slw-person__family { margin: .35rem 0 0; font-size: .88rem; color: var(--c-muted); }
.slw-person__bio { max-width: 22rem; margin: .6rem auto 0; font-size: .88rem; color: var(--c-muted); }
.slw-person__ig { display: inline-block; margin-top: .6rem; color: var(--c-accent); font-size: .84rem; font-weight: 600; text-decoration: none; }

/* Hitung mundur: lingkaran kecil seperti riak air */
.slw-countdown { display: flex; justify-content: center; gap: .6rem; margin: 0 auto 2rem; }
.slw .slw-countdown .inv-countdown__cell {
    display: grid; justify-items: center; gap: .15rem; min-width: 3.7rem; padding: .7rem .2rem .55rem;
    border: 1px solid color-mix(in srgb, var(--slw-gold) 60%, transparent); border-radius: 50%; aspect-ratio: 1; align-content: center; background: radial-gradient(circle at 45% 40%, #FFFDF8 35%, rgb(127 154 174 / .18));
    box-shadow: 0 0 0 4px rgb(255 253 248 / .5), 0 0 0 5px rgb(127 154 174 / .25);
}
.slw .slw-countdown b { font: 400 1.75rem/1 var(--f-display); color: var(--c-accent); }
.slw .slw-countdown span { font-size: .66rem; text-transform: none; letter-spacing: .04em; color: var(--c-muted); }

/* Acara */
.slw-events__list { display: grid; gap: 0; }
.slw-event { padding: 1.35rem 0; }
.slw-event + .slw-event { border-top: 1px solid var(--c-rule); }
.slw-event.is-past { opacity: .55; }
.slw-event__title { margin: 0 0 .2rem; font: 400 1.7rem/1.45 var(--f-names); color: var(--c-accent); }
.slw-event__date { margin: 0; font: 400 1.12rem/1.4 var(--f-display); letter-spacing: .05em; }
.slw-event__time { margin: 0; color: var(--c-muted); }
.slw-event__venue { margin: .85rem 0 0; font-weight: 600; }
.slw-event__address { margin: .1rem 0 0; font-size: .88rem; color: var(--c-muted); }
.slw-event__meta { margin: .35rem 0 0; font-size: .84rem; color: var(--c-muted); }
.slw-event__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem; margin-top: 1.1rem; }
.slw-event__actions .inv-btn { flex: 1 1 8.5rem; text-align: center; }

/* Tombol */
.slw .inv-btn { border-radius: 999px; padding: .72rem 1.2rem; font: 500 .82rem/1.2 var(--f-body); letter-spacing: .02em; text-transform: none; }
.slw .inv-btn--solid { background: var(--c-accent); border-color: var(--c-accent); color: var(--slw-ivory); box-shadow: none; }
.slw .inv-btn--ghost { background: rgb(255 255 255 / .55); border-color: var(--slw-gold); color: var(--c-ink); }
.slw .inv-btn:hover { filter: none; background: var(--c-ink); border-color: var(--c-ink); color: #fff; }

/* Cerita: kuntum mawar kecil sebagai penanda */
.slw-story__list { display: grid; gap: 1.75rem; margin: 0; padding: 0; list-style: none; }
.slw-story__item { display: grid; justify-items: center; }
.slw-story__item::before {
    content: ''; width: .7rem; height: .7rem; margin-bottom: .6rem; border-radius: 50%;
    background: radial-gradient(circle at 40% 40%, #F4D2CC, var(--slw-rose) 60%);
    box-shadow: 0 0 0 3px var(--slw-sheet), 0 0 0 4px var(--slw-leaf);
}
.slw-story__period { margin: 0; font: 400 .95rem/1.2 var(--f-display); letter-spacing: .14em; color: var(--c-muted); }
.slw-story__title { margin: .15rem 0 0; font: 400 1.35rem/1.3 var(--f-display); color: var(--c-ink); }
.slw-story__img { width: 100%; aspect-ratio: 4 / 3; margin-top: .75rem; object-fit: cover; border-radius: 3px; box-shadow: 0 0 0 1px var(--slw-gold), 0 0 0 5px var(--slw-ivory), 0 0 0 6px color-mix(in srgb, var(--slw-gold) 40%, transparent); }
.slw-story__text { max-width: 25rem; margin: .5rem 0 0; font-size: .9rem; color: var(--c-muted); }

/* Galeri (markup _base): foto pertama lonjong seperti bingkai surat */
.slw .inv-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: .45rem; }
.slw .inv-gallery__cell { padding: 0; border: 0; border-radius: .4rem; aspect-ratio: 3 / 4; overflow: hidden; background: var(--c-sunk); cursor: zoom-in; }
.slw .inv-gallery__cell:first-child { grid-column: 1 / -1; width: 70%; margin: 0 auto .7rem; aspect-ratio: 3 / 4.2; border-radius: 50%; box-shadow: 0 0 0 1px var(--slw-gold), 0 0 0 7px var(--slw-ivory), 0 0 0 8px color-mix(in srgb, var(--slw-gold) 45%, transparent); }
.slw .inv-gallery__cell img { width: 100%; height: 100%; object-fit: cover; }

/* Video & siaran langsung */
.slw .inv-video { padding: 0; border: 0; border-radius: 3px; overflow: hidden; background: #000; }
.slw .inv-video iframe { position: static; display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; }

/* Form RSVP & ucapan (markup _base) */
.slw .inv-form { gap: 1.3rem; text-align: left; }
.slw .inv-label { font-size: .85rem; font-weight: 600; letter-spacing: 0; text-transform: none; color: var(--c-ink); }
.slw .inv-input { padding: .8rem 1rem; border: 1px solid var(--slw-gold); border-radius: .6rem; background: rgb(255 255 255 / .8); font-size: .95rem; }
.slw .inv-input:focus, .slw .inv-input:focus-visible { outline: none; border-color: var(--c-accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-accent) 16%, transparent); }
.slw .inv-choice { border-color: var(--slw-gold); border-radius: .6rem; background: rgb(255 255 255 / .8); }
.slw .inv-choice:has(:checked) { border-color: var(--c-accent); background: color-mix(in srgb, var(--c-accent) 7%, #fff); color: var(--c-accent); }
.slw .inv-choice input { accent-color: var(--c-accent); }
.slw .inv-form .inv-btn--solid { width: 100%; padding-block: .95rem; }
.slw .inv-tally div { border: 1px solid var(--slw-gold); border-radius: .6rem; background: rgb(255 255 255 / .75); }
.slw .inv-tally dd { font-family: var(--f-display); font-size: 1.9rem; color: var(--c-accent); }
.slw .inv-wish { padding: .95rem 1.1rem; border: 0; border-left: 2px solid var(--slw-gold); border-radius: 0 .6rem .6rem 0; background: rgb(255 255 255 / .7); text-align: left; }
.slw .inv-wish__name { font-weight: 600; color: var(--c-accent); }

/* Hadiah: kartu warna utama seperti pita, berkas cahaya air di sudut */
.slw .inv-gifts { display: grid; gap: 1rem; }
.slw .inv-gift {
    position: relative; overflow: hidden; isolation: isolate; padding: 1.9rem 1.5rem; border: 0; border-radius: .6rem; text-align: center; color: var(--slw-ivory);
    background: linear-gradient(160deg, color-mix(in srgb, var(--c-accent) 88%, #fff), color-mix(in srgb, var(--c-accent) 78%, #1a0c0c));
    box-shadow: inset 0 0 30px rgb(60 20 30 / .25), 0 14px 26px -18px rgb(40 55 70 / .5);
}
.slw .inv-gift::before {
    content: ''; position: absolute; z-index: -1; inset: 0;
    background:
        radial-gradient(55% 45% at 85% 10%, rgb(255 250 240 / .28), transparent 70%),
        radial-gradient(50% 40% at 10% 95%, rgb(127 154 174 / .35), transparent 70%);
}
.slw .inv-gift__logo { max-height: 1.6rem; margin-inline: auto; filter: brightness(0) invert(1); opacity: .9; }
.slw .inv-gift__label { font-size: .85rem; letter-spacing: .02em; text-transform: none; color: rgb(245 240 222 / .75); }
.slw .inv-gift__account { font: 400 1.75rem/1.3 var(--f-display); letter-spacing: .08em; color: #fff; }
.slw .inv-gift__holder, .slw .inv-gift__address { color: rgb(245 240 222 / .85); }
.slw .inv-gift .inv-btn--ghost { margin-top: 1rem; background: transparent; border-color: rgb(245 240 222 / .5); color: #fff; }
.slw .inv-gift__qr { display: block; max-width: 12rem; margin: .75rem auto 0; padding: .5rem; background: #fff; border-radius: .4rem; }

/* Penutup */
.slw .slw-closing { margin-bottom: 46vh; }
.slw-closing__text { max-width: 24rem; margin: 0 auto; color: var(--c-muted); }
.slw-closing__salutation { margin: 1.6rem 0 0; font: 400 1rem/1.3 var(--f-display); letter-spacing: .12em; color: var(--c-muted); }
.slw-closing__names { display: grid; margin: .2rem 0 0; font: 400 clamp(2.3rem, 10vw, 2.8rem)/1.4 var(--f-names); color: var(--c-accent); }
.slw-closing__names .slw-amp { font-size: .46em; line-height: 1.6; letter-spacing: .1em; }
.slw-closing__tag { margin: .8rem 0 0; font-size: .88rem; color: var(--c-muted); }

.slw .slw-footer {
    position: relative; margin: 0 -1rem; padding: 1rem; border-radius: 1rem 1rem 0 0;
    background: rgb(40 55 70 / .82); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
    color: rgb(251 246 236 / .85); font-size: .75rem; text-align: center;
}
.slw .slw-footer a { color: #fff; }

/* Musik, tombol QR, navigasi cepat */
.slw .inv-music { background: var(--c-accent); }
.slw .inv-checkin-btn { background: var(--c-accent); color: #fff; }
.slw { --qn-bg: rgb(251 246 236 / .94); --qn-fg: var(--c-muted); --qn-active: var(--c-accent); }

/* ------------------------------------------------------------ layar lebar */

@media (min-aspect-ratio: 3 / 4) {
    .slw .inv-cover.slw-cover { isolation: isolate; }
    .slw .inv-cover.slw-cover::before {
        content: ''; position: absolute; inset: -40px; z-index: -1;
        background: var(--slw-blur) center / cover; filter: blur(24px);
    }
    .slw-stage { box-shadow: 0 0 80px -10px rgb(0 0 0 / .45); }
}
@media (min-width: 900px) {
    .slw .inv-cover.slw-cover { left: 0; right: 0; width: auto; }
}

@media (prefers-reduced-motion: reduce) {
    body.slw.is-open .slw-main { animation: none; }
    .slw-cover__text, .slw-cover__foot, .slw-stage__start { transition: none; }
}

/* ------------------------------------------------- HP: bilah alamat menyusut
   Di HP, bilah alamat menutup sendiri saat digulir → tinggi layar berubah →
   latar fixed ikut berubah ukuran ("melompat"). Latar memakai tinggi layar
   TERBESAR (lvh) yang tetap, jadi tidak berubah saat bilah alamat muncul/hilang. */
.slw-lake { bottom: auto; height: 100vh; height: 100lvh; }