/* /css/layout.css — khung trang: canvas 3D, header, điều hướng, nút, footer, lớp phủ */

/* ---------- Canvas 3D cố định phía sau ---------- */
.scene-wrap {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100vh;
  height: 100lvh;
  z-index: 0;
  background: linear-gradient(180deg, var(--sky), var(--cream));
}

#scene {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: pan-y;
}

.scene-fallback {
  display: none;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Không có WebGL → hiện ảnh tĩnh */
.no-webgl #scene { display: none; }
.no-webgl .scene-fallback { display: block; }

/* Lớp trắng mờ khi camera xuyên qua mây */
.whiteout {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle at 50% 48%, #fff 0 38%, #FFF8E8 70%, var(--cream) 100%);
}

/* Ánh đèn ấm trong mái ấm: phủ dần khi camera bước qua khung cửa ở cuối câu chuyện */
.door-light {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(ellipse at 50% 55%, #FFF6DA 0 30%, #FFE6B0 62%, #FFD3A6 100%);
}

/* ---------- Bong bóng xà phòng (ui.js tạo) ---------- */
.bubbles {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  overflow: hidden;
}

.bubble {
  position: absolute;
  bottom: -140px;
  left: var(--x);
  width: var(--s);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .55);
  background:
    radial-gradient(circle at 32% 28%, rgba(255, 255, 255, .95) 0 5%, rgba(255, 255, 255, 0) 13%),
    radial-gradient(circle at 70% 76%, rgba(255, 255, 255, .55) 0 3%, rgba(255, 255, 255, 0) 8%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0) 56%, rgba(142, 214, 234, .28) 70%, rgba(177, 63, 209, .24) 82%, rgba(255, 141, 181, .42) 93%, rgba(255, 255, 255, .65) 99%);
  box-shadow: inset -5px -7px 16px rgba(255, 141, 181, .22), inset 6px 5px 14px rgba(142, 214, 234, .3);
  animation: bubble-rise var(--dur, 20s) linear var(--delay, 0s) infinite;
  will-change: transform;
}

@keyframes bubble-rise {
  0% { transform: translate3d(0, 0, 0); }
  25% { transform: translate3d(16px, -32vh, 0); }
  50% { transform: translate3d(-12px, -64vh, 0); }
  75% { transform: translate3d(14px, -96vh, 0); }
  100% { transform: translate3d(0, -130vh, 0); }
}

.reduced-motion .bubble {
  animation: none;
  bottom: auto;
  top: var(--y, 50%);
}

/* ---------- Mây phủ khi chuyển trang ---------- */
.cloud-veil {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  overflow: hidden;
}

.cloud-veil::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 55%, #fff 0%, var(--cream) 65%, var(--blush) 130%);
  opacity: 0;
  transition: opacity .45s var(--ease-soft) .15s;
}

.cloud-veil .puff {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: var(--s);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 38%, #fff 0 46%, #FFFBF0 62%, rgba(255, 246, 218, 0) 71%);
  transform: translate(-50%, -50%) scale(.15);
  opacity: 0;
  transition: transform .75s var(--ease-soft) var(--d, 0s), opacity .5s ease var(--d, 0s);
}

.cloud-veil .p1 { --x: 8%;  --y: 18%; --s: 62vmax; --d: 0s; }
.cloud-veil .p2 { --x: 46%; --y: 6%;  --s: 58vmax; --d: .05s; }
.cloud-veil .p3 { --x: 92%; --y: 20%; --s: 64vmax; --d: .1s; }
.cloud-veil .p4 { --x: 22%; --y: 62%; --s: 66vmax; --d: .08s; }
.cloud-veil .p5 { --x: 70%; --y: 58%; --s: 70vmax; --d: .02s; }
.cloud-veil .p6 { --x: 50%; --y: 96%; --s: 60vmax; --d: .12s; }
.cloud-veil .p7 { --x: 2%;  --y: 98%; --s: 56vmax; --d: .14s; }
.cloud-veil .p8 { --x: 98%; --y: 92%; --s: 58vmax; --d: .06s; }

html.is-veiled .cloud-veil,
html.is-leaving .cloud-veil { pointer-events: all; }

html.is-veiled .cloud-veil::before,
html.is-leaving .cloud-veil::before { opacity: 1; }

html.is-veiled .cloud-veil .puff,
html.is-leaving .cloud-veil .puff {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

/* Khi mây tan: các cụm mây trôi ra ngoài một chút */
html:not(.is-veiled):not(.is-leaving) .cloud-veil .puff {
  transform: translate(calc(-50% + (var(--x) - 50%) * .4), -50%) scale(.3);
}

/* ---------- Header & điều hướng ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px var(--gutter);
  pointer-events: none;
}

.site-header > * { pointer-events: auto; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px 6px 8px;
  border-radius: var(--radius-pill);
  background: rgba(255, 246, 218, .82);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px -14px rgba(58, 47, 85, .5);
  text-decoration: none;
}

.brand__mark { width: 38px; height: 38px; flex: none; }

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.2rem;
  line-height: 1;
  padding-top: .18em; /* chừa chỗ cho dấu mũ của chữ Ê */
  background: var(--title-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* "Vai em" cùng cỡ với "Êm Ái", màu tím mận cho tách bạch với phần hồng */
.brand__name small {
  font-size: 1em;
  font-weight: 900;
  margin-left: .12em;
  background: linear-gradient(180deg, #B07BE6 10%, #8E4FC0 55%, #6E33A6 95%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-toggle {
  display: inline-grid;
  place-items: center;
  width: 48px; height: 48px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 246, 218, .88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px -14px rgba(58, 47, 85, .5);
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 20px;
  height: 3px;
  border-radius: 3px;
  background: var(--ink);
  transition: transform .35s var(--ease-bounce), opacity .2s;
}

.nav-toggle__bars { position: relative; }
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; left: 0; }
.nav-toggle__bars::before { top: -7px; }
.nav-toggle__bars::after { top: 7px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  position: absolute;
  top: calc(100% - 4px);
  right: var(--gutter);
  left: var(--gutter);
  padding: 10px;
  border-radius: 26px;
  background: rgba(255, 246, 218, .96);
  box-shadow: var(--shadow-soft);
  transform-origin: top right;
  transform: scale(.9) translateY(-8px);
  opacity: 0;
  visibility: hidden;
  transition: transform .35s var(--ease-bounce), opacity .2s, visibility 0s .35s;
}

.site-nav.is-open {
  transform: none;
  opacity: 1;
  visibility: visible;
  transition: transform .35s var(--ease-bounce), opacity .2s;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.site-nav a {
  display: block;
  padding: .7em 1.1em;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  transition: background .2s, transform .3s var(--ease-bounce);
}

.site-nav a:hover { background: rgba(249, 202, 215, .6); }

.site-nav a[aria-current="page"] {
  background: var(--blush);
  color: var(--pink-deep);
}

.site-nav .nav-cta {
  background: var(--btn-grad);
  color: #fff;
  text-align: center;
}

.site-nav .nav-cta[aria-current="page"] {
  background: var(--btn-grad);
  color: #fff;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, .55);
}

@media (min-width: 860px) {
  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    padding: 6px;
    border-radius: var(--radius-pill);
    background: rgba(255, 246, 218, .82);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 24px -14px rgba(58, 47, 85, .5);
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .site-nav ul { display: flex; gap: 2px; }
  .site-nav a { padding: .5em 1.1em; font-size: 1rem; }
  .site-nav a:hover { transform: translateY(-2px); }
}

/* ---------- Nội dung ---------- */
main {
  position: relative;
  z-index: 5;
}

.container {
  width: min(100% - 2 * var(--gutter), var(--maxw));
  margin-inline: auto;
}

.section {
  padding-block: clamp(56px, 10vw, 120px);
}

.section-head {
  max-width: 40rem;
  margin: 0 auto clamp(28px, 5vw, 56px);
  text-align: center;
}

.section-head h2 { color: var(--violet-soft); margin-top: .2em; }
.section-head .lead { margin-top: .6em; }

.panel {
  position: relative;
  padding: clamp(22px, 4vw, 40px);
  border-radius: var(--radius-card);
  background: rgba(255, 246, 218, .9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
}

/* Grain riêng cho thẻ (giống giấy in poster) */
.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--grain);
  background-size: 180px;
  opacity: .14;
  mix-blend-mode: multiply;
  pointer-events: none;
}

.page-hero {
  padding: calc(var(--header-h) + clamp(48px, 10vh, 110px)) 0 clamp(40px, 8vh, 90px);
  text-align: center;
}

.page-hero .script { margin-top: .3em; }
.page-hero .lead {
  max-width: 36rem;
  margin: 1.2em auto 0;
  padding: .9em 1.2em;
  border-radius: 24px;
  color: var(--ink);
  background: rgba(255, 246, 218, .72);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

/* ---------- Nút bo tròn tối đa ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  min-height: 52px;
  padding: .8em 1.7em;
  border: 0;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.15rem;
  line-height: 1.1;
  text-decoration: none;
  cursor: pointer;
  transition: transform .4s var(--ease-bounce), box-shadow .3s, background .3s;
}

.btn--primary {
  background: var(--btn-grad);
  color: #fff;
  box-shadow: 0 6px 0 #C23C74, 0 16px 28px -10px rgba(226, 79, 138, .7);
  text-shadow: 0 1px 0 rgba(150, 30, 80, .35);
}

.btn--primary:hover { transform: translateY(-3px) scale(1.02); }
.btn--primary:active { transform: translateY(4px); box-shadow: 0 2px 0 #C23C74, 0 8px 16px -10px rgba(226, 79, 138, .7); }

.btn--ghost {
  background: rgba(255, 246, 218, .9);
  color: var(--ink);
  box-shadow: inset 0 0 0 2px rgba(154, 104, 201, .45), 0 10px 22px -14px rgba(58, 47, 85, .5);
}

.btn--ghost:hover { transform: translateY(-3px); background: #fff; }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* ---------- Hoa tím viền khung (theo a1) ---------- */
.flower-frame {
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
}

.flower-frame::before,
.flower-frame::after {
  content: "";
  position: absolute;
  width: clamp(80px, 12vw, 170px);
  aspect-ratio: 3 / 4;
  background: url("../assets/flowers.svg") no-repeat center / contain;
  opacity: .9;
}

.flower-frame::before { left: -40px; top: 22vh; transform: rotate(-8deg); }
.flower-frame::after { right: -40px; bottom: -16px; transform: scaleX(-1) rotate(-12deg); }

@media (max-width: 719px) {
  .flower-frame::before { left: -48px; top: 10vh; opacity: .55; }
  .flower-frame::after { right: -48px; opacity: .55; }
}

/* Máy bay giấy (theo a2) */
.paper-plane {
  position: absolute;
  width: clamp(56px, 8vw, 96px);
  pointer-events: none;
  animation: plane-drift 9s ease-in-out infinite;
}

@keyframes plane-drift {
  0%, 100% { transform: translate(0, 0) rotate(-6deg); }
  50% { transform: translate(-22px, 14px) rotate(4deg); }
}

/* ---------- Hiện dần khi cuộn tới ---------- */
.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s var(--ease-soft), transform .8s var(--ease-soft);
  transition-delay: var(--delay, 0s);
}

.reveal-ready [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* Thanh tiến độ dự phòng (khi không có WebGL để vẽ sợi len 3D) */
.thread-fallback {
  display: none;
  position: fixed;
  top: calc(var(--header-h) + 12px);
  bottom: 20px;
  right: 10px;
  width: 4px;
  z-index: 40;
  border-radius: 4px;
  background: rgba(255, 141, 181, .25);
}

.thread-fallback::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: calc(var(--p, 0) * 100%);
  border-radius: inherit;
  background: repeating-linear-gradient(160deg, var(--pink) 0 6px, var(--pink-deep) 6px 9px);
}

.no-webgl .thread-fallback { display: block; }

/* ---------- Footer: dải đồi xanh ---------- */
.site-footer {
  position: relative;
  z-index: 5;
  margin-top: 40px;
  padding: 90px var(--gutter) 40px;
  text-align: center;
  color: var(--cream);
  background: linear-gradient(180deg, #B6E26E 0%, var(--leaf) 30%, #6FB34E 100%);
  /* Mép trên lượn sóng như những ngọn đồi */
  --hill: 180px;
  -webkit-mask:
    radial-gradient(calc(var(--hill) * .72) 56px at 50% 56px, #000 98%, #0000) 0 0 / var(--hill) 56px repeat-x,
    linear-gradient(#000 0 0) 0 55px / 100% 100% no-repeat;
  mask:
    radial-gradient(calc(var(--hill) * .72) 56px at 50% 56px, #000 98%, #0000) 0 0 / var(--hill) 56px repeat-x,
    linear-gradient(#000 0 0) 0 55px / 100% 100% no-repeat;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--grain);
  background-size: 200px;
  opacity: .2;
  mix-blend-mode: multiply;
  pointer-events: none;
}

.site-footer .script { margin-bottom: .6em; }

.site-footer nav ul {
  list-style: none;
  padding: 0;
  margin: 1.2em 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 22px;
}

.site-footer nav a {
  font-family: var(--font-heading);
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  text-shadow: 0 2px 6px rgba(40, 90, 30, .45);
}

.site-footer nav a:hover { text-decoration: underline; text-underline-offset: 4px; }

.footer-small {
  font-size: .85rem;
  color: #F6FFE6;
  text-shadow: 0 1px 4px rgba(40, 90, 30, .5);
}

/* Thanh điều hướng gọn: các trang đi cùng nhau, nút đồng hành tách riêng. */
.site-nav {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, .75);
  background: rgba(255, 250, 237, .97);
}
.site-nav .nav-links {
  display: flex;
  justify-content: space-between;
  gap: 2px;
}
.site-nav .nav-links li { flex: 1 1 0; }
.site-nav .nav-links a {
  padding: .65em .3em;
  text-align: center;
  white-space: nowrap;
  font-size: clamp(.78rem, 3.4vw, 1rem);
}
.site-nav .nav-cta {
  display: block;
  padding: .7em 1.4em;
  box-shadow: 0 6px 18px rgba(190, 75, 121, .18);
}
@media (min-width: 860px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
  }
  .site-nav .nav-links {
    padding: 6px;
    border: 1px solid rgba(255, 255, 255, .65);
    border-radius: var(--radius-pill);
    background: rgba(255, 250, 237, .9);
    box-shadow: 0 8px 24px -14px rgba(58, 47, 85, .5);
    backdrop-filter: blur(10px);
  }
  .site-nav .nav-links li { flex: none; }
  .site-nav .nav-links a { padding: .5em 1.1em; font-size: 1rem; }
  .site-nav .nav-cta { padding: .8em 1.45em; }
}

/* Để trọn cả cánh hoa bên trong khung hình. */
.flower-frame::before { left: 18px; top: 22vh; }
.flower-frame::after { right: 18px; bottom: 20px; }
@media (max-width: 719px) {
  .flower-frame::before { left: 12px; top: 12vh; opacity: .38; }
  .flower-frame::after { right: 12px; bottom: 16px; opacity: .38; }
}