* {
  box-sizing: border-box;
}

@font-face {
  font-family: "Pacifico";
  src: url("../assets/fonts/Pacifico-Regular.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  position: relative;
  overflow-x: hidden;
  font-family: "Pacifico", cursive, sans-serif;
}

/* Nền toàn trang: chỉ ảnh backgroud.jpg */
#bg-base {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: url("../assets/cover/backgroud.jpg") center / cover no-repeat;
  background-color: #fce4ec;
}

/* iPad / tablet (viewport ngang điển hình ~1024–1366px): album + thư dùng ảnh nền riêng */
@media (min-width: 1024px) and (max-width: 1366px) {
  body.scene-book #bg-base,
  body.scene-letters #bg-base {
    background-image: url("../assets/cover/backgroudIpad.jpg");
  }
}

/* Nội dung app nổi trên nền */
.page-stack {
  position: relative;
  z-index: 10;
  isolation: isolate;
  min-height: 100dvh;
}

/* Luồng: quà → bánh → sách → thư */
body.scene-gift .panel--cake,
body.scene-gift .panel--book,
body.scene-gift .panel--letters {
  display: none !important;
}

body.scene-cake .panel--giftbox,
body.scene-cake .panel--book,
body.scene-cake .panel--letters {
  display: none !important;
}

body.scene-cake .panel--cake {
  display: flex !important;
}

body.scene-book .panel--giftbox,
body.scene-book .panel--cake,
body.scene-book .panel--letters {
  display: none !important;
}

body.scene-book .panel--book {
  display: flex !important;
}

body.scene-letters .panel--giftbox,
body.scene-letters .panel--cake,
body.scene-letters .panel--book {
  display: none;
}

body.scene-letters .panel--letters {
  display: block;
}

body.scene-imagefly .panel--giftbox,
body.scene-imagefly .panel--cake,
body.scene-imagefly .panel--book,
body.scene-imagefly .panel--letters {
  display: none !important;
}

body.scene-imagefly .panel--imagefly {
  display: block !important;
}

body:not(.scene-imagefly) .panel--imagefly {
  display: none !important;
}

/* ========== Cake (cake.css — scope trong .panel--cake) ========== */

.panel--cake {
  margin: 0;
  min-height: 100dvh;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  position: relative;
  padding: 1rem;
  box-sizing: border-box;
}

.panel--cake .cake-stage {
  position: relative;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.panel--cake #cake {
  display: block;
  position: relative;
  margin: -10em auto 0 auto;
  /* Che phần trên viewBox: các path SMIL lúc đầu hay lộ ở góc trên — chỉ giữ hiệu ứng rơi xuống phía dưới */
  clip-path: inset(20% 0 0 0);
  -webkit-clip-path: inset(20% 0 0 0);
}

.panel--cake .velas {
  background: #ffffff;
  border-radius: 10px;
  position: absolute;
  top: 228px;
  left: 50%;
  margin-left: -2.4px;
  margin-top: -8.33333333px;
  width: 5px;
  height: 35px;
  transform: translateY(-300px);
  backface-visibility: hidden;
  animation: cake-candle-in 500ms 5s ease-out forwards;
}

.panel--cake .velas:after,
.panel--cake .velas:before {
  background: rgba(255, 0, 0, 0.4);
  content: "";
  position: absolute;
  width: 100%;
  height: 2.22222222px;
}

.panel--cake .velas:after {
  top: 25%;
  left: 0;
}

.panel--cake .velas:before {
  top: 45%;
  left: 0;
}

.panel--cake .fuego {
  border-radius: 100%;
  position: absolute;
  top: -20px;
  left: 50%;
  margin-left: -2.6px;
  width: 6.66666667px;
  height: 18px;
}

.panel--cake .fuego:nth-child(1) {
  animation: cake-fuego 2s 5.5s infinite;
}
.panel--cake .fuego:nth-child(2) {
  animation: cake-fuego 1.5s 5.5s infinite;
}
.panel--cake .fuego:nth-child(3) {
  animation: cake-fuego 1s 5.5s infinite;
}
.panel--cake .fuego:nth-child(4) {
  animation: cake-fuego 0.5s 5.5s infinite;
}
.panel--cake .fuego:nth-child(5) {
  animation: cake-fuego 0.2s 5.5s infinite;
}

@keyframes cake-fuego {
  0%,
  100% {
    background: rgba(254, 248, 97, 0.5);
    box-shadow: 0 0 40px 10px rgba(248, 233, 209, 0.2);
    transform: translateY(0) scale(1);
  }
  50% {
    background: rgba(255, 50, 0, 0.1);
    box-shadow: 0 0 40px 20px rgba(248, 233, 209, 0.2);
    transform: translateY(-20px) scale(0);
  }
}

@keyframes cake-candle-in {
  to {
    transform: translateY(0);
  }
}

/* Chữ: ẩn đến khi nến rơi xong; nút: ẩn đến khi gõ chữ xong */
.panel--cake:not(.cake-candle-done) .text {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: none;
}

.panel--cake.cake-candle-done .text {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.35s ease;
}

.panel--cake:not(.cake-btn-ready) .cake-next-btn {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: none;
}

.panel--cake.cake-btn-ready .cake-next-btn {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.45s ease;
}

.panel--cake .text {
  color: #8b6a60;
  font-family: "Pacifico", cursive, sans-serif;
  font-weight: 400;
  font-style: normal;
  text-align: center;
}

.panel--cake .text h1 {
  font-size: 1.4em;
}

.panel--cake .cake-type-caret {
  display: inline-block;
}

.panel--cake .cake-type-caret::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 0.85em;
  margin-left: 3px;
  background: currentColor;
  opacity: 1;
  vertical-align: -0.12em;
  animation: cake-caret-blink 0.75s step-end infinite;
}

@keyframes cake-caret-blink {
  50% {
    opacity: 0;
  }
}

.panel--cake .cake-name {
  margin: 0.35em 0 0;
  font-size: 1.25em;
}

.cake-next-btn {
  position: static;
  margin-top: 1.25rem;
  align-self: center;
  padding: 0.65em 1.35em;
  font-family: "Pacifico", cursive, sans-serif;
  font-size: clamp(14px, 1rem, 17px);
  font-weight: 400;
  color: #fff;
  background: #8b6a60;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 0.3em 1em rgba(0, 0, 0, 0.2);
}

.cake-next-btn:hover {
  filter: brightness(1.08);
}

.book-open-letter-btn {
  position: absolute;
  left: 50%;
  bottom: max(24px, 4dvh);
  transform: translateX(-50%);
  z-index: 20;
  padding: 0.65em 1.4em;
  font-family: "Pacifico", cursive, sans-serif;
  font-size: clamp(14px, 1rem, 18px);
  font-weight: 400;
  color: hsl(200 30% 98%);
  background: linear-gradient(145deg, hsl(231 45% 38%), hsl(180 50% 28%));
  border: none;
  border-radius: 999px;
  box-shadow: 0 0.35em 1.2em hsl(180 68% 15% / 0.35);
  cursor: pointer;
  pointer-events: auto;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}

.book-open-letter-btn:hover {
  transform: translateX(-50%) translateY(-2px);
  box-shadow: 0 0.5em 1.4em hsl(180 68% 12% / 0.4);
}

.book-open-letter-btn:active {
  transform: translateX(-50%) translateY(0);
}

/* Nút thư + next — chỉ hiện khi lật đến trang cuối (JS bỏ [hidden]) */
.album-end-cta[hidden] {
  display: none !important;
}

.album-end-cta:not([hidden]) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  pointer-events: auto;
  transform: translateX(-50%);
  background: #fff;
  border: 2px solid hsl(330 48% 84%);
  box-shadow:
    0 0 14px hsl(330 75% 78% / 0.85),
    0 0 28px hsl(330 85% 82% / 0.65),
    0 0 48px hsl(330 90% 85% / 0.45),
    0 0.15em 0.5em hsl(330 45% 55% / 0.15);
  animation: album-end-cta-glow 2.4s ease-in-out infinite alternate;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.album-end-cta {
  position: fixed;
  left: 50%;
  bottom: max(14px, 3dvh);
  z-index: 25;
  font: inherit;
}

@keyframes album-end-cta-glow {
  0% {
    box-shadow:
      0 0 12px hsl(330 80% 80% / 0.75),
      0 0 28px hsl(330 88% 84% / 0.55),
      0 0 52px hsl(330 92% 88% / 0.4),
      0 0 72px hsl(330 95% 90% / 0.22),
      0 0.15em 0.45em hsl(330 40% 50% / 0.14);
    border-color: hsl(330 42% 86%);
  }
  100% {
    box-shadow:
      0 0 22px hsl(330 82% 78% / 0.95),
      0 0 42px hsl(330 88% 82% / 0.8),
      0 0 64px hsl(330 92% 86% / 0.6),
      0 0 88px hsl(330 96% 90% / 0.38),
      0 0 110px hsl(330 98% 92% / 0.2),
      0 0.15em 0.55em hsl(330 40% 48% / 0.16);
    border-color: hsl(330 50% 78%);
  }
}

.album-end-cta:not([hidden]):hover {
  transform: translateX(-50%) translateY(-2px);
  border-color: hsl(330 52% 76%);
  box-shadow:
    0 0 20px hsl(330 82% 78% / 0.95),
    0 0 40px hsl(330 88% 82% / 0.75),
    0 0 68px hsl(330 92% 86% / 0.55),
    0 0 96px hsl(330 96% 90% / 0.35),
    0 0.25em 0.75em hsl(330 42% 45% / 0.18);
}

.album-end-cta:not([hidden]):active {
  transform: translateX(-50%) translateY(0);
}

.album-end-cta__icons {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.album-end-cta__icon {
  display: block;
  width: clamp(1.2rem, 4.2vw, 1.85rem);
  height: clamp(1.2rem, 4.2vw, 1.85rem);
  object-fit: contain;
  filter: drop-shadow(0 1px 2px hsl(0 0% 0% / 0.25));
}

.album-end-cta__icon--next {
  transform: scale(1.52);
  transform-origin: center;
}

@media (min-width: 768px) {
  .album-end-cta:not([hidden]) {
    padding: 0.55rem 1rem;
    border-width: 2px;
  }

  .album-end-cta__icons {
    gap: 0.4rem;
  }

  .album-end-cta__icon {
    width: clamp(1.65rem, 3.2vw, 2.15rem);
    height: clamp(1.65rem, 3.2vw, 2.15rem);
  }

  .album-end-cta__icon--next {
    transform: scale(1.58);
  }
}

@media (min-width: 1024px) {
  .album-end-cta:not([hidden]) {
    padding: 0.7rem 1.25rem;
    border-width: 3px;
  }

  .album-end-cta__icons {
    gap: 0.5rem;
  }

  .album-end-cta__icon {
    width: clamp(2rem, 2.6vw, 2.65rem);
    height: clamp(2rem, 2.6vw, 2.65rem);
  }

  .album-end-cta__icon--next {
    transform: scale(1.64);
  }
}

@media (min-width: 1440px) {
  .album-end-cta:not([hidden]) {
    padding: 0.8rem 1.45rem;
  }

  .album-end-cta__icon {
    width: clamp(2.35rem, 2.4vw, 3rem);
    height: clamp(2.35rem, 2.4vw, 3rem);
  }

  .album-end-cta__icon--next {
    transform: scale(1.7);
  }
}

/* ========== Book (flip book) — giữ cấu trúc/selector như book.css gốc ========== */

.panel--book {
  /* tương đương body trong book.html gốc + vị trí nút */
  margin: 0;
  position: relative;
  display: flex;
  min-height: 100dvh;
  height: 100dvh;
  width: 100%;
  box-sizing: border-box;
  /* cqmin trên .book / .page tính theo khung album */
  container-type: size;
  container-name: book-stage;
  perspective: 1000px;
  font:
    1em/1.4 "Pacifico",
    cursive,
    sans-serif;
  overflow: hidden;
  color: hsl(180 68% 5%);
  background: transparent;
}

.book {
  position: relative;
  display: flex;
  margin: auto;
  width: 40cqmin;
  height: 56cqmin;
  pointer-events: none;
  transform-style: preserve-3d;
  transition: translate 1s;
  translate: calc(min(var(--c), 1) * 50%) 0%;
  rotate: 1 0 0 30deg;
  counter-reset: page -1;

  & a {
    color: inherit;
  }
}

/* Điện thoại / màn hẹp: album to hơn desktop (40/56cqmin → 68cqmin, ~1,7× chiều ngang) */
@media (max-width: 968px) {
  .panel--book .book {
    width: 58cqmin;
    height: 85.2cqmin;
  }

  .panel--book .page {
    font-size: 3.1cqmin;
  }
}

.page {
  --thickness: 4;
  flex: none;
  display: flex;
  width: 100%;
  font-size: 2cqmin;
  pointer-events: all;
  user-select: none;
  transform-style: preserve-3d;
  transform-origin: left center;
  transition:
    transform 1s,
    rotate 1s ease-in
      calc((min(var(--i), var(--c)) - max(var(--i), var(--c))) * 50ms);
  translate: calc(var(--i) * -100%) 0px 0px;
  transform: translateZ(
    calc((var(--c) - var(--i) - 0.5) * calc(var(--thickness) * 0.23cqmin))
  );
  rotate: 0 1 0 calc(clamp(0, var(--c) - var(--i), 1) * -180deg);
}

.front,
.back {
  position: relative;
  flex: none;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  overflow: hidden;
  background-color: #fff;
  translate: 0px;
}

.back {
  translate: -100% 0;
  rotate: 0 1 0 180deg;
}

.page {
  box-shadow: 0em 0.5em 1em -0.2em #00000020;
}

.front,
.back {
  display: flex;
  flex-flow: column wrap;
  justify-content: space-between;
  padding: 2em;
  border: 1px solid #0002;

  &:has(img) {
    padding: 0;
  }

  & img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  &::after {
    position: absolute;
    bottom: 1em;
    counter-increment: page;
    content: counter(page) ".";
    font-size: 0.8em;
  }
}

.cover::after {
  content: "";
}

.panel--book .front::after,
.panel--book .back::after {
  content: "";
  display: none;
}

.front {
  &::after {
    right: 1em;
  }
  background: linear-gradient(to left, #f7f7f7 80%, #eee 100%);
  border-radius: 0.1em 0.5em 0.5em 0.1em;
}

.back {
  &::after {
    left: 1em;
  }
  background-image: linear-gradient(to right, #f7f7f7 80%, #eee 100%);
  border-radius: 0.5em 0.1em 0.1em 0.5em;
}

.cover {
  background:
    radial-gradient(
      circle farthest-corner at 80% 20%,
      hsl(150 80% 20% / 0.3) 0%,
      hsl(170 60% 10% / 0.1) 100%
    ),
    hsl(231, 32%, 29%) var(--book-cover-image, none) 50% / cover;
  color: hsl(200 30% 98%);
}

/* ========== Letters / envelope (chi tiết trong letter.css) ========== */

.letters-svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.panel--letters {
  background: transparent;
  min-height: 100dvh;
  position: relative;
  z-index: 10;
}

/* ========== Gift box ========== */

.panel--giftbox {
  --s: 6s ease-in-out infinite;
  --y: rgba(235, 231, 214, 1);
  --y25: rgba(235, 231, 214, 0.25);
  --b: rgba(107, 36, 27, 0.25);
  --b10: rgba(107, 36, 27, 0.1);
  position: relative;
  height: 100vh;
  min-height: 100dvh;
  margin: 0;
  display: grid;
  place-items: center;
  background: transparent;
  overflow: hidden;
}

.panel--giftbox .present-container {
  position: relative;
  z-index: 1;
  height: 40vh;
  width: 70vw;
  align-content: end;
  justify-items: center;
}

.panel--giftbox .present {
  height: 300px;
  width: 250px;
  position: relative;
  cursor: pointer;

  &:hover {
    animation: giftbox-shake 0.5s ease-in-out infinite;
  }

  &::before,
  &::after {
    content: "";
    display: block;
    position: absolute;
    bottom: -20px;
    left: -100px;
    height: 35px;
    width: 450px;
    background: radial-gradient(rgba(0, 0, 0, 0.25), #0000, #0000);
  }
  &::after {
    width: 120px;
    left: 240px;
    opacity: 0;
    z-index: 0;
    animation: giftbox-top-drop-shadow var(--s);
    animation-play-state: paused;
  }

  .animate,
  .animate::after,
  .animate::before {
    animation-play-state: paused;
  }

  .animate.run,
  .animate.run::after,
  .animate.run::before {
    animation-play-state: running;
  }
}

.panel--giftbox .bow-loop {
  position: absolute;
  top: -58px;
  left: 53px;
  width: 60px;
  height: 30px;
  border: solid #fff 14px;
  border-radius: 50% 60% 0 50%;
  rotate: 5deg;
  &::after {
    content: "";
    position: absolute;
    top: -14px;
    left: -14px;
    display: block;
    width: 88px;
    height: 58px;
    border-radius: 50% 60% 0 50%;
    rotate: 0deg;
    filter: saturate(400%);
    box-shadow:
      inset -2px -2px 10px var(--y25),
      inset -4px -4px 10px rgba(0, 0, 0, 0.25);
  }

  &.left {
    animation: giftbox-bow-flip var(--s);
    animation-play-state: paused;
  }
  &.right {
    scale: -1 1;
    rotate: -5deg;
    left: 136px;
    &::after {
      box-shadow:
        inset 2px -2px 10px var(--y25),
        inset 4px -4px 10px rgba(0, 0, 0, 0.15);
    }
  }
}

.panel--giftbox .top-container {
  left: 0;
  rotate: 0deg;
  bottom: 240px;
  position: absolute;
  z-index: 10;
  animation: giftbox-top-flip var(--s);
  animation-play-state: paused;

  .ribbon {
    position: absolute;
    z-index: 1;
    background: linear-gradient(var(--y), #fff 10%, var(--y) 40%);
    clip-path: polygon(100% 0%, 100% 49%, 100% 100%, 50% 50%, 0 100%, 0 0);
    border-radius: 20px 0px 0px 0px;
    height: 60px;
    width: 30px;
    top: -12px;
    left: 71px;
    rotate: 35deg;
    &.right {
      left: 151px;
      rotate: -35deg;
      border-radius: 0px 20px 0px 0px;
    }
    &.left {
      top: -12px;
      left: 71px;
      rotate: 15deg;
      border-radius: 20px 0px 0px 0px;
    }
  }
  .ribbon.animate {
    animation: giftbox-ribbon-flip var(--s);
    animation-play-state: paused;
  }

  .top {
    animation: giftbox-top-shadow var(--s);
    animation-play-state: paused;
    position: absolute;
    height: 50px;
    width: 250px;
    border-radius: 4px;
    background:
      linear-gradient(var(--b10), #0000, var(--b)),
      linear-gradient(90deg, red 110px, #0000 0, #0000 140px, red 0),
      linear-gradient(var(--y) 0px, #fff 15px, var(--y));
  }
}

.panel--giftbox .present-front {
  animation-play-state: paused;
  animation: giftbox-front-shadow var(--s);
  position: absolute;
  bottom: 0;
  left: 15px;
  height: 200px;
  width: 220px;
  border-radius: 2px 2px 4px 4px;
  background:
    linear-gradient(var(--b), #0000, #0000, var(--b)),
    linear-gradient(90deg, red 93px, #0000 0, #0000 124px, red 0),
    linear-gradient(var(--y), #fff, var(--y));
}

@keyframes giftbox-shake {
  0% {
    rotate: 0deg;
  }
  25% {
    rotate: -2deg;
  }
  50% {
    rotate: 2deg;
  }
  75% {
    rotate: -2deg;
  }
  100% {
    rotate: 0deg;
  }
}

@keyframes giftbox-top-flip {
  0% {
    left: 0;
    rotate: 0deg;
    bottom: 240px;
  }
  5% {
    bottom: 350px;
  }
  10% {
    left: 275px;
    rotate: 80deg;
    bottom: 250px;
  }
  100% {
    left: 275px;
    rotate: 80deg;
    bottom: 250px;
  }
}

@keyframes giftbox-bow-flip {
  0% {
    top: -58px;
    left: 53px;
    rotate: 5deg;
    scale: 1;
  }
  10% {
    top: -60px;
    left: 113px;
    rotate: -20deg;
    scale: -1 1;
  }
  100% {
    top: -60px;
    left: 113px;
    rotate: -20deg;
    scale: -1 1;
  }
}

@keyframes giftbox-ribbon-flip {
  0% {
    left: 71px;
    rotate: 45deg;
    border-radius: 20px 0px 0px 0px;
  }
  10% {
    left: 106px;
    rotate: -25deg;
    border-radius: 0px 20px 0px 0px;
  }
  100% {
    left: 106px;
    rotate: -25deg;
    border-radius: 0px 20px 0px 0px;
  }
}

@keyframes giftbox-front-shadow {
  0% {
    box-shadow: inset 0px 10px 10px rgba(0, 0, 0, 0.15);
    background:
      linear-gradient(var(--b), #0000, #0000, var(--b)),
      linear-gradient(90deg, red 93px, #0000 0, #0000 124px, red 0),
      linear-gradient(var(--y), #fff, var(--y));
  }
  10% {
    box-shadow: inset -5px 1px 10px rgba(0, 0, 0, 0.15);
    background:
      linear-gradient(var(--b10), #0000, #0000, var(--b)),
      linear-gradient(90deg, red 95px, #0000 0, #0000 125px, red 0),
      linear-gradient(var(--y), #fff, var(--y));
  }
  100% {
    box-shadow: inset -5px 1px 10px rgba(0, 0, 0, 0.15);
    background:
      linear-gradient(var(--b10), #0000, #0000, var(--b)),
      linear-gradient(90deg, red 95px, #0000 0, #0000 125px, red 0),
      linear-gradient(var(--y), #fff, var(--y));
  }
}

@keyframes giftbox-top-shadow {
  0% {
    box-shadow: inset 0px 2px 5px rgba(0, 0, 0, 0.15);
  }
  10% {
    box-shadow: inset -10px -5px 10px rgba(0, 0, 0, 0.15);
  }
  100% {
    box-shadow: inset -10px -5px 10px rgba(0, 0, 0, 0.15);
  }
}

@keyframes giftbox-top-drop-shadow {
  0% {
    opacity: 0;
  }
  10% {
    opacity: 100%;
  }
  100% {
    opacity: 100%;
  }
}