/* ══════════════════════════════════════════════════════════════════
   THIỆP CƯỚI ONLINE — Kami Studio
   Bảng màu lấy từ nhận diện Trang Kami (ivory / gold / sand / espresso)
   nhưng đảo sang nền SÁNG cho hợp thiệp cưới.

   ⚠ CỐ Ý KHÔNG đặt `scroll-behavior: smooth` toàn cục. Đặt toàn cục thì
     mọi phép đo scroll khi kiểm thử đều sai (đã dính ngày 11/08: tưởng
     nửa dưới trang hỏng, sửa oan 3 lần). Cần cuộn mượt thì gọi
     scrollIntoView({behavior:'smooth'}) tại từng chỗ.
   ══════════════════════════════════════════════════════════════════ */

:root {
  --kem: #f8f4ed;
  --kem-dam: #efe7d9;
  --kem-sau: #e6dbc8;
  --muc: #2b241d;
  --muc-nhat: #6f6357;
  --vang: #bf9f62;
  --vang-sang: #d9c49a;
  --cat: #cfc4af;
  --trang: #fffdf9;

  --chu-ten: 'Cormorant Garamond', 'Times New Roman', serif;
  --chu-viet: 'Dancing Script', cursive;
  --chu-than: 'Lora', Georgia, serif;

  --khung: 640px;
  --dem: clamp(20px, 6vw, 34px);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--kem);
  color: var(--muc);
  font-family: var(--chu-than);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* Khoá cuộn khi bìa thiệp còn đóng */
body.dang-dong { overflow: hidden; height: 100vh; }

img { max-width: 100%; display: block; }

/* ── Nền hoa văn rất nhạt cho cả trang ─────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .5;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(191, 159, 98, .07) 0, transparent 42%),
    radial-gradient(circle at 88% 72%, rgba(191, 159, 98, .06) 0, transparent 40%);
}

/* ══ BÌA THIỆP ═══════════════════════════════════════════════════ */
#bia {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--muc);
  transition: opacity .9s ease, visibility .9s ease;
}
#bia.da-mo { opacity: 0; visibility: hidden; pointer-events: none; }

#bia-anh {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(.52) saturate(.9);
  transform: scale(1.06);
  animation: tho 18s ease-in-out infinite alternate;
}
@keyframes tho { to { transform: scale(1.14); } }

#bia-noi-dung {
  position: relative;
  z-index: 2;
  width: min(92vw, 460px);
  padding: clamp(28px, 8vw, 46px) clamp(20px, 6vw, 34px);
  text-align: center;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .38);
  outline: 1px solid rgba(255, 255, 255, .16);
  outline-offset: 7px;
  background: rgba(20, 16, 12, .3);
  backdrop-filter: blur(2px);
}

.bia-nhan {
  font-family: var(--chu-viet);
  font-size: clamp(26px, 8vw, 34px);
  color: var(--vang-sang);
  line-height: 1.2;
  margin: 0 0 6px;
}
.bia-ngay {
  font-family: var(--chu-ten);
  letter-spacing: .34em;
  font-size: clamp(13px, 3.6vw, 15px);
  margin: 0 0 22px;
  padding-left: .34em;
  opacity: .92;
}
.bia-ten {
  font-family: var(--chu-ten);
  font-weight: 500;
  font-size: clamp(30px, 9.5vw, 44px);
  line-height: 1.18;
  letter-spacing: .04em;
  margin: 0;
}
.bia-va {
  font-family: var(--chu-viet);
  font-size: clamp(28px, 8vw, 36px);
  color: var(--vang-sang);
  line-height: 1;
  margin: 4px 0;
}
.bia-moi {
  margin: 20px 0 4px;
  font-size: clamp(11px, 3vw, 12px);
  letter-spacing: .26em;
  text-transform: uppercase;
  opacity: .82;
  padding-left: .26em;
}
.bia-khach {
  font-family: var(--chu-viet);
  font-size: clamp(24px, 7vw, 30px);
  color: var(--vang-sang);
  margin: 0 0 4px;
  min-height: 1.2em;
}

#nut-mo {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 30px;
  border: 1px solid var(--vang-sang);
  background: rgba(191, 159, 98, .16);
  color: #fff;
  font-family: var(--chu-than);
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 999px;
  transition: background .3s ease, transform .2s ease;
}
#nut-mo:hover { background: rgba(191, 159, 98, .34); }
#nut-mo:active { transform: scale(.97); }

.cham-de-mo {
  margin: 14px 0 0;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  opacity: .6;
  animation: nhap 2.4s ease-in-out infinite;
}
@keyframes nhap { 50% { opacity: .22; } }

/* ══ BỐ CỤC CHUNG ════════════════════════════════════════════════ */
main { position: relative; z-index: 1; }

section {
  padding: clamp(52px, 13vw, 88px) var(--dem);
}
.khung {
  max-width: var(--khung);
  margin: 0 auto;
}
.nen-dam { background: var(--kem-dam); }

h2.tieu-de {
  font-family: var(--chu-ten);
  font-weight: 500;
  font-size: clamp(19px, 5.4vw, 24px);
  letter-spacing: .26em;
  text-transform: uppercase;
  text-align: center;
  margin: 0 0 8px;
  padding-left: .26em;
}
.phu-de {
  font-family: var(--chu-viet);
  font-size: clamp(22px, 6.5vw, 28px);
  color: var(--vang);
  text-align: center;
  margin: 0 0 26px;
  line-height: 1.3;
}

/* Hoa văn ngăn cách */
.hoa-van {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 0 auto 30px;
  max-width: 260px;
  color: var(--vang);
}
.hoa-van::before,
.hoa-van::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--cat), transparent);
}
.hoa-van span { font-size: 13px; letter-spacing: .3em; }

/* Hiện dần khi cuộn tới */
.hien-dan {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .8s ease, transform .8s ease;
}
.hien-dan.da-hien { opacity: 1; transform: none; }

/* ══ 1. MỞ ĐẦU — tên cô dâu chú rể ═══════════════════════════════ */
#mo-dau { text-align: center; padding-top: clamp(60px, 16vw, 100px); }
#mo-dau .ten-lon {
  font-family: var(--chu-ten);
  font-weight: 500;
  font-size: clamp(34px, 11vw, 52px);
  letter-spacing: .05em;
  line-height: 1.15;
  margin: 0;
  text-transform: uppercase;
}
#mo-dau .va {
  font-family: var(--chu-viet);
  font-size: clamp(32px, 10vw, 44px);
  color: var(--vang);
  line-height: 1;
  margin: 6px 0;
}
#mo-dau .cau-moi {
  max-width: 30em;
  margin: 22px auto 0;
  color: var(--muc-nhat);
  font-style: italic;
}
.ngay-lon {
  margin-top: 26px;
  font-family: var(--chu-ten);
  font-size: clamp(17px, 4.8vw, 21px);
  letter-spacing: .3em;
  padding-left: .3em;
}

/* ══ 2. HAI HỌ ═══════════════════════════════════════════════════ */
.hai-ho {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
@media (min-width: 620px) { .hai-ho { grid-template-columns: 1fr 1fr; gap: 22px; } }

.the-ho {
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  padding: 26px 22px;
  text-align: center;
}
.the-ho .nhan {
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--vang);
  text-transform: uppercase;
  margin: 0 0 12px;
  padding-left: .24em;
}
.the-ho .ong-ba {
  font-family: var(--chu-ten);
  font-size: 20px;
  line-height: 1.5;
  margin: 0;
}
.the-ho .dia-chi {
  font-size: 13.5px;
  color: var(--muc-nhat);
  margin: 12px 0 0;
  line-height: 1.6;
}

.con-cai {
  margin-top: 26px;
  text-align: center;
}
.con-cai .ten {
  font-family: var(--chu-ten);
  font-size: clamp(22px, 6vw, 27px);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin: 0;
}
.con-cai .thu-bac {
  font-family: var(--chu-viet);
  font-size: 20px;
  color: var(--vang);
  margin: 0 0 8px;
}
.con-cai .va-nho {
  font-family: var(--chu-viet);
  font-size: 26px;
  color: var(--vang);
  margin: 6px 0;
}

/* ══ 3. SỰ KIỆN ══════════════════════════════════════════════════ */
.the-su-kien {
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  padding: 30px 22px;
  text-align: center;
  margin-bottom: 20px;
}
.the-su-kien:last-child { margin-bottom: 0; }
.the-su-kien .ten-le {
  font-family: var(--chu-ten);
  font-size: clamp(21px, 5.8vw, 26px);
  letter-spacing: .14em;
  margin: 0;
  padding-left: .14em;
}
.the-su-kien .noi {
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--muc-nhat);
  text-transform: uppercase;
  margin: 6px 0 20px;
  padding-left: .2em;
}

.dong-ngay {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 0 0 6px;
}
.dong-ngay .o {
  text-align: center;
  min-width: 62px;
}
.dong-ngay .o .so {
  font-family: var(--chu-ten);
  font-size: clamp(30px, 8.6vw, 38px);
  line-height: 1;
  display: block;
}
.dong-ngay .o .nhan {
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muc-nhat);
  display: block;
  margin-top: 6px;
  padding-left: .18em;
}
.dong-ngay .vach { width: 1px; align-self: stretch; background: var(--kem-sau); }

.am-lich {
  font-size: 13px;
  font-style: italic;
  color: var(--muc-nhat);
  margin: 14px 0 0;
}
.dia-chi-le {
  font-size: 14.5px;
  margin: 10px 0 0;
  line-height: 1.6;
}
.nut-vien {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 10px 22px;
  border: 1px solid var(--vang);
  color: var(--muc);
  background: transparent;
  font-family: var(--chu-than);
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 999px;
  cursor: pointer;
  transition: background .25s ease, color .25s ease;
}
.nut-vien:hover { background: var(--vang); color: #fff; }

/* ══ 4. LỜI NHẮN ═════════════════════════════════════════════════ */
.the-nhan {
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  padding: 0 0 26px;
  margin-bottom: 22px;
  text-align: center;
  overflow: hidden;
}
.the-nhan:last-child { margin-bottom: 0; }
.the-nhan .anh {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.the-nhan .vai {
  font-family: var(--chu-viet);
  font-size: 24px;
  color: var(--vang);
  margin: 18px 0 0;
}
.the-nhan .ho-ten {
  font-family: var(--chu-ten);
  font-size: 21px;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin: 0 0 12px;
  padding-left: .12em;
}
.the-nhan .noi-dung {
  padding: 0 22px;
  font-size: 15px;
  color: var(--muc-nhat);
  font-style: italic;
  white-space: pre-line;
  text-align: left;
}
@media (min-width: 620px) {
  .the-nhan { display: grid; grid-template-columns: 240px 1fr; text-align: left; align-items: center; padding: 0; }
  .the-nhan .anh { height: 100%; aspect-ratio: auto; min-height: 260px; }
  .the-nhan .noi-dung { padding: 0 26px 0 24px; }
  .the-nhan .vai { margin: 24px 0 0; padding-left: 24px; }
  .the-nhan .ho-ten { padding-left: 24px; }
  .the-nhan .khoi-chu { padding-bottom: 24px; }
}

/* ══ 5. LỊCH TRÌNH ═══════════════════════════════════════════════ */
.lich-trinh { list-style: none; margin: 0; padding: 0; position: relative; }
.lich-trinh::before {
  content: '';
  position: absolute;
  left: 58px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--cat);
}
.lich-trinh li {
  display: grid;
  grid-template-columns: 58px 30px 1fr;
  align-items: center;
  padding: 12px 0;
}
.lich-trinh .gio {
  font-family: var(--chu-ten);
  font-size: 19px;
  text-align: right;
  padding-right: 4px;
}
.lich-trinh .cham { justify-self: center; position: relative; }
.lich-trinh .cham i {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--vang);
  box-shadow: 0 0 0 4px var(--kem-dam);
}
.nen-dam .lich-trinh .cham i { box-shadow: 0 0 0 4px var(--kem-dam); }
.lich-trinh .viec { font-size: 15px; }

/* ══ 6. LỊCH THÁNG + ĐẾM NGƯỢC ═══════════════════════════════════ */
.lich-thang {
  max-width: 340px;
  margin: 0 auto;
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  padding: 20px 16px 16px;
}
.lich-thang .dau {
  text-align: center;
  font-family: var(--chu-ten);
  letter-spacing: .24em;
  font-size: 13px;
  text-transform: uppercase;
  margin-bottom: 14px;
  padding-left: .24em;
}
.lich-luoi {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
  text-align: center;
  font-size: 12.5px;
}
.lich-luoi .thu {
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--muc-nhat);
  text-transform: uppercase;
  padding-bottom: 6px;
}
.lich-luoi .o-ngay {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}
.lich-luoi .o-ngay.cuoi {
  background: var(--vang);
  color: #fff;
  font-weight: 600;
  position: relative;
}
.lich-luoi .o-ngay.cuoi::after {
  content: '♥';
  position: absolute;
  bottom: -2px;
  right: -2px;
  font-size: 11px;
  color: var(--vang);
}

.dem-nguoc {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 26px;
  flex-wrap: wrap;
}
.dem-nguoc .o {
  min-width: 66px;
  padding: 12px 6px;
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  text-align: center;
}
.dem-nguoc .o b {
  display: block;
  font-family: var(--chu-ten);
  font-weight: 500;
  font-size: 26px;
  line-height: 1;
}
.dem-nguoc .o span {
  display: block;
  margin-top: 6px;
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muc-nhat);
  padding-left: .16em;
}
.da-cuoi {
  text-align: center;
  margin-top: 22px;
  font-family: var(--chu-viet);
  font-size: 24px;
  color: var(--vang);
}

/* ══ 7. ALBUM ════════════════════════════════════════════════════ */
.luoi-anh {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
@media (min-width: 620px) { .luoi-anh { grid-template-columns: repeat(3, 1fr); gap: 10px; } }
.luoi-anh button {
  padding: 0;
  border: 0;
  background: var(--kem-sau);
  cursor: pointer;
  overflow: hidden;
  aspect-ratio: 3 / 4;
}
.luoi-anh img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.luoi-anh button:hover img { transform: scale(1.06); }

/* Xem ảnh lớn */
#xem-anh {
  position: fixed;
  inset: 0;
  z-index: 95;
  background: rgba(18, 14, 10, .94);
  display: none;
  align-items: center;
  justify-content: center;
}
#xem-anh.mo { display: flex; }
#xem-anh img {
  max-width: 94vw;
  max-height: 82vh;
  object-fit: contain;
}
#xem-anh .dieu-khien {
  position: absolute;
  inset: auto 0 22px;
  display: flex;
  justify-content: center;
  gap: 14px;
}
#xem-anh button {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .4);
  background: rgba(255, 255, 255, .1);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
}
#xem-anh .dong {
  position: absolute;
  top: 16px;
  right: 16px;
  bottom: auto;
  left: auto;
}

/* ══ 8. MỪNG CƯỚI ════════════════════════════════════════════════ */
.luoi-qr {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
@media (min-width: 560px) { .luoi-qr { grid-template-columns: 1fr 1fr; } }
.the-qr {
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  padding: 22px 18px;
  text-align: center;
}
.the-qr .ben {
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--vang);
  margin: 0 0 14px;
  padding-left: .22em;
}
.the-qr img {
  width: 172px;
  height: 172px;
  margin: 0 auto 14px;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--kem-sau);
  padding: 6px;
}
.the-qr .chu-tk { font-family: var(--chu-ten); font-size: 17px; margin: 0; }
.the-qr .ngan-hang { font-size: 13px; color: var(--muc-nhat); margin: 2px 0 8px; }
.the-qr .so-tk {
  font-size: 15px;
  letter-spacing: .06em;
  margin: 0 0 12px;
  word-break: break-all;
}

/* ══ 9. SỔ LƯU BÚT ═══════════════════════════════════════════════ */
.loi-chuc { display: grid; gap: 12px; margin-top: 8px; }
.the-chuc {
  background: var(--trang);
  border: 1px solid var(--kem-sau);
  padding: 16px 18px;
}
.the-chuc .dau-the {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}
.the-chuc .ten { font-family: var(--chu-ten); font-size: 18px; }
.the-chuc .khi { font-size: 11.5px; color: var(--muc-nhat); white-space: nowrap; }
.the-chuc .noi-dung { font-size: 14.5px; color: var(--muc-nhat); margin: 0; }
.chuc-trong {
  text-align: center;
  color: var(--muc-nhat);
  font-style: italic;
  padding: 18px 0;
}
#xem-them-chuc { display: block; margin: 14px auto 0; }

/* ══ 10. FORM XÁC NHẬN ═══════════════════════════════════════════ */
.form-rsvp { display: grid; gap: 16px; }
.o-nhap { display: grid; gap: 7px; }
.o-nhap > label {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muc-nhat);
  padding-left: .18em;
}
.o-nhap input[type='text'],
.o-nhap input[type='tel'],
.o-nhap input[type='number'],
.o-nhap textarea,
.o-nhap select {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--kem-sau);
  background: var(--trang);
  color: var(--muc);
  font-family: var(--chu-than);
  font-size: 15px;
  border-radius: 2px;
}
.o-nhap textarea { min-height: 96px; resize: vertical; }
.o-nhap input:focus,
.o-nhap textarea:focus,
.o-nhap select:focus { outline: 2px solid var(--vang-sang); outline-offset: 1px; }

.nhom-chon { display: flex; flex-wrap: wrap; gap: 8px; }
.nhom-chon label {
  flex: 1 1 auto;
  min-width: 132px;
  position: relative;
}
.nhom-chon input { position: absolute; opacity: 0; pointer-events: none; }
.nhom-chon span {
  display: block;
  text-align: center;
  padding: 11px 12px;
  border: 1px solid var(--kem-sau);
  background: var(--trang);
  font-size: 14px;
  cursor: pointer;
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}
.nhom-chon input:checked + span {
  border-color: var(--vang);
  background: var(--vang);
  color: #fff;
}
.nhom-chon input:focus-visible + span { outline: 2px solid var(--vang-sang); outline-offset: 2px; }

.nut-chinh {
  width: 100%;
  padding: 15px 22px;
  border: 0;
  background: var(--muc);
  color: var(--kem);
  font-family: var(--chu-than);
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 2px;
  transition: background .25s ease, opacity .25s ease;
}
.nut-chinh:hover { background: var(--vang); }
.nut-chinh:disabled { opacity: .55; cursor: not-allowed; }

.bao-ket-qua {
  display: none;
  padding: 14px 16px;
  font-size: 14.5px;
  border-left: 3px solid var(--vang);
  background: var(--trang);
}
.bao-ket-qua.hien { display: block; }
.bao-ket-qua.loi { border-left-color: #b4453c; color: #8d332c; }

.o-bay { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ══ CHÂN TRANG ══════════════════════════════════════════════════ */
#loi-ket {
  text-align: center;
  padding: clamp(56px, 14vw, 90px) var(--dem);
  background: var(--muc);
  color: var(--kem);
}
#loi-ket .cau {
  font-family: var(--chu-ten);
  font-size: clamp(15px, 4.2vw, 18px);
  letter-spacing: .18em;
  line-height: 1.9;
  max-width: 26em;
  margin: 0 auto;
  padding-left: .18em;
}
#loi-ket .ten-doi {
  font-family: var(--chu-viet);
  font-size: clamp(30px, 9vw, 40px);
  color: var(--vang-sang);
  margin: 22px 0 0;
}
#loi-ket .ky-ten {
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  opacity: .5;
  margin-top: 32px;
  padding-left: .2em;
}
#loi-ket .ky-ten a { color: var(--vang-sang); text-decoration: none; }

/* ══ NÚT NỔI ═════════════════════════════════════════════════════ */
#nut-nhac {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 60;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--cat);
  background: rgba(255, 253, 249, .88);
  color: var(--muc);
  font-size: 15px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}
#nut-nhac.hien { display: flex; }
#nut-nhac.dang-phat i { animation: quay 6s linear infinite; display: block; font-style: normal; }
@keyframes quay { to { transform: rotate(360deg); } }

#thanh-day {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
  background: rgba(248, 244, 237, .95);
  border-top: 1px solid var(--kem-sau);
  backdrop-filter: blur(6px);
  transform: translateY(110%);
  transition: transform .4s ease;
}
#thanh-day.hien { transform: none; }
#thanh-day button {
  display: block;
  width: 100%;
  max-width: var(--khung);
  margin: 0 auto;
  padding: 13px;
  border: 0;
  background: var(--muc);
  color: var(--kem);
  font-family: var(--chu-than);
  font-size: 12.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  border-radius: 2px;
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .hien-dan { opacity: 1; transform: none; }
}