/* breath.css, bản 3.3 (11/11/2026): cảnh sống cho bốn màn Thở (B02), Thiền hẹn giờ (B03), Thiền có lời dẫn (B04), Âm thanh nền (B05).
   Màn dựng ở screens-a.js, mục B. Mọi màu đi qua token; token mới ở đầu tệp, chế độ tối theo đúng mẫu của tokens.css.
   Chỉ chuyển động transform và opacity. Giảm chuyển động: cảnh đứng yên; nhịp thở vẫn rõ nhờ chữ, cỡ hoa, cung đang sáng và hạt đếm giây.
   Tương phản đo bằng công thức WCAG (oklch sang sRGB): chữ mực trên trời sáng thấp nhất 6,8 : 1 (đêm), trên trời tối thấp nhất 9,9 : 1. */

:root {
  /* Trời cả vùng trên của màn theo giờ (đỉnh, chân trời). Chữ trên trời chỉ là tiêu đề và nút của thanh trên, màu mực. */
  --bx-sky-dawn-1: oklch(86% 0.05 285); --bx-sky-dawn-2: oklch(91% 0.06 55);
  --bx-sky-day-1: oklch(86% 0.065 228); --bx-sky-day-2: oklch(93% 0.035 205);
  --bx-sky-dusk-1: oklch(83% 0.065 305); --bx-sky-dusk-2: oklch(90% 0.075 58);
  --bx-sky-night-1: oklch(76% 0.07 275); --bx-sky-night-2: oklch(85% 0.055 295);
  /* Đồi xa, núi xa, rặng thông; đồi gần dùng --color-field để liền với đồng cỏ */
  --bx-hill-far: oklch(89% 0.05 168); --bx-mount: oklch(84% 0.035 245); --bx-pine: oklch(64% 0.07 195);
  /* Mây, sao, đom đóm, mưa, suối, gió, hơi trà */
  --bx-cloud: var(--art-cloud-sky); --bx-cloud-rain: oklch(82% 0.02 245);
  --bx-star: oklch(72% 0.13 85); --bx-glow: oklch(82% 0.17 115);
  --bx-rain: oklch(56% 0.08 240 / 0.5); --bx-rain-solid: oklch(58% 0.08 240);
  --bx-stream: oklch(80% 0.075 218); --bx-stream-2: oklch(97% 0.02 215);
  --bx-wind: oklch(60% 0.05 250 / 0.55); --bx-steam: oklch(62% 0.03 240); --bx-orb-rain: 0.35;
  /* Vòng thở và vòng thiền: rãnh, quầng sáng, cung pha (trang trí; chấm sáng và vệt tiến độ dùng --color-select) */
  --bx-track: oklch(100% 0 0 / 0.55); --bx-halo: oklch(100% 0 0 / 0.3); --bx-dot-ring: oklch(100% 0 0);
  --bx-ph-in: oklch(80% 0.14 78); --bx-ph-out: oklch(74% 0.09 220); --bx-ph-hold: oklch(76% 0.09 305);
  --bx-disc: oklch(99.3% 0.006 155 / 0.88);
}

:root[data-mode="dark"] {
  --bx-sky-dawn-1: oklch(28% 0.06 290); --bx-sky-dawn-2: oklch(34% 0.07 35);
  --bx-sky-day-1: oklch(28% 0.055 240); --bx-sky-day-2: oklch(34% 0.05 220);
  --bx-sky-dusk-1: oklch(26% 0.06 305); --bx-sky-dusk-2: oklch(33% 0.07 50);
  --bx-sky-night-1: oklch(19% 0.045 270); --bx-sky-night-2: oklch(25% 0.055 285);
  --bx-hill-far: oklch(31% 0.045 180); --bx-mount: oklch(34% 0.04 250); --bx-pine: oklch(23% 0.04 195);
  --bx-cloud: oklch(42% 0.03 240); --bx-cloud-rain: oklch(37% 0.025 245);
  --bx-star: var(--art-star); --bx-glow: var(--art-firefly);
  --bx-rain: oklch(82% 0.05 230 / 0.45); --bx-rain-solid: oklch(78% 0.06 230);
  --bx-stream: oklch(42% 0.07 225); --bx-stream-2: oklch(78% 0.06 215);
  --bx-wind: oklch(84% 0.03 200 / 0.5); --bx-steam: oklch(82% 0.02 230); --bx-orb-rain: 0.12;
  --bx-track: oklch(100% 0 0 / 0.12); --bx-halo: oklch(90% 0.1 125 / 0.09); --bx-dot-ring: oklch(21% 0.035 170);
  --bx-ph-in: oklch(82% 0.13 80); --bx-ph-out: oklch(74% 0.08 215); --bx-ph-hold: oklch(74% 0.09 305);
  --bx-disc: oklch(28% 0.042 170 / 0.9);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-mode]) {
    --bx-sky-dawn-1: oklch(28% 0.06 290); --bx-sky-dawn-2: oklch(34% 0.07 35);
    --bx-sky-day-1: oklch(28% 0.055 240); --bx-sky-day-2: oklch(34% 0.05 220);
    --bx-sky-dusk-1: oklch(26% 0.06 305); --bx-sky-dusk-2: oklch(33% 0.07 50);
    --bx-sky-night-1: oklch(19% 0.045 270); --bx-sky-night-2: oklch(25% 0.055 285);
    --bx-hill-far: oklch(31% 0.045 180); --bx-mount: oklch(34% 0.04 250); --bx-pine: oklch(23% 0.04 195);
    --bx-cloud: oklch(42% 0.03 240); --bx-cloud-rain: oklch(37% 0.025 245);
    --bx-star: var(--art-star); --bx-glow: var(--art-firefly);
    --bx-rain: oklch(82% 0.05 230 / 0.45); --bx-rain-solid: oklch(78% 0.06 230);
    --bx-stream: oklch(42% 0.07 225); --bx-stream-2: oklch(78% 0.06 215);
    --bx-wind: oklch(84% 0.03 200 / 0.5); --bx-steam: oklch(82% 0.02 230); --bx-orb-rain: 0.12;
    --bx-track: oklch(100% 0 0 / 0.12); --bx-halo: oklch(90% 0.1 125 / 0.09); --bx-dot-ring: oklch(21% 0.035 170);
    --bx-ph-in: oklch(82% 0.13 80); --bx-ph-out: oklch(74% 0.08 215); --bx-ph-hold: oklch(74% 0.09 305);
    --bx-disc: oklch(28% 0.042 170 / 0.9);
  }
}

/* ---------- Khung chung: vùng trời (bx-head) ở trên, đồng cỏ ở dưới, thảm hoa ở chân màn ---------- */
.bx { --bx-foot: 72px; position: relative; isolation: isolate; overflow: clip; display: grid; grid-template-columns: minmax(0, 1fr); grid-template-rows: 1fr; grid-auto-rows: auto; justify-items: center; align-content: start; gap: var(--space-md); min-height: 100%; padding: 0 var(--space-md) var(--bx-foot); background: var(--color-field); color: var(--color-field-ink); text-align: center; }
.bx > * { min-width: 0; }
.bx--dawn { --bx-s1: var(--bx-sky-dawn-1); --bx-s2: var(--bx-sky-dawn-2); }
.bx--day { --bx-s1: var(--bx-sky-day-1); --bx-s2: var(--bx-sky-day-2); }
.bx--dusk { --bx-s1: var(--bx-sky-dusk-1); --bx-s2: var(--bx-sky-dusk-2); }
.bx--night { --bx-s1: var(--bx-sky-night-1); --bx-s2: var(--bx-sky-night-2); }
.bx-head { position: relative; isolation: isolate; overflow: clip; display: flex; flex-direction: column; justify-self: stretch; margin-inline: calc(-1 * var(--space-md)); padding: 0 var(--space-md) 46px; background: linear-gradient(180deg, var(--bx-s1) 6%, var(--bx-s2) 82%); color: var(--color-ink); text-align: left; }
.bx-head > .top { position: relative; z-index: 2; }
.bx-stage { position: relative; z-index: 1; flex: 1 1 auto; display: grid; place-items: center; align-content: center; padding-top: var(--space-xs); text-align: center; }
.bx-sky { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.bx-sky > .fireflies { top: 92px; } /* sửa 11/11: đom đóm không còn nằm cạnh nút quay lại */
.bx-hills { position: absolute; left: 0; bottom: -1px; z-index: 0; width: 100%; height: 120px; pointer-events: none; }
.bx-hill-far { fill: var(--bx-hill-far); }
.bx-hill-near { fill: var(--color-field); }
.bx-mount { fill: var(--bx-mount); }
.bx .meadow { z-index: -1; }
.bx-stop { min-width: 10rem; background: var(--color-card); }
.bx .breath__left { font-variant-numeric: tabular-nums; }

/* Mặt trời, trăng, sao, mây */
.bx-orb { position: absolute; left: 80%; top: 104px; width: 64px; height: 64px; margin: -32px 0 0 -32px; }
.bx-orb svg { width: 100%; height: 100%; overflow: visible; }
.bx-orb .sc-rays { animation: none; }
.bx-orb:not(.is-moon) { animation: sc-spin 80s linear infinite; } /* cả mặt trời xoay (lớp HTML), nhẹ hơn xoay tia trong SVG */
.bx-sky > .bx-orb { transition: opacity 900ms var(--ease-in-out); }
[data-fx="mua"] .bx-sky > .bx-orb { opacity: var(--bx-orb-rain); } /* trời mưa: mặt trời khuất sau mây */
.bx--dawn .bx-sky > .bx-orb { left: 15%; top: 152px; }
.bx--dusk .bx-sky > .bx-orb { left: 85%; top: 158px; }
.bx-star { position: absolute; width: 4px; height: 4px; margin: -2px 0 0 -2px; border-radius: 50%; background: var(--bx-star); animation: bx-twinkle 3.4s var(--ease-in-out) var(--d, 0s) infinite alternate; }
.bx-star.is-big { width: 11px; height: 11px; margin: -5.5px 0 0 -5.5px; border-radius: 0; clip-path: polygon(50% 0, 61% 39%, 100% 50%, 61% 61%, 50% 100%, 39% 61%, 0 50%, 39% 39%); }
@keyframes bx-twinkle { from { opacity: 0.3; } to { opacity: 1; } }
.bx-cloud { position: absolute; left: 0; width: 56px; height: 35px; transform-origin: 0 50%; transform: translateX(var(--x, 0px)) scale(var(--s, 1)); animation: bx-drift var(--dur, 140s) linear var(--d, 0s) infinite; }
.bx-cloud svg { display: block; width: 100%; height: 100%; fill: var(--bx-cloud); }
.bx-cloud.is-rain svg { fill: var(--bx-cloud-rain); }
@keyframes bx-drift { from { transform: translateX(-130px) scale(var(--s, 1)); } to { transform: translateX(540px) scale(var(--s, 1)); } }

/* ---------- Hiệu ứng theo âm nền (data-fx trên khung màn): chỉ lớp trùng mới hiện và chạy ---------- */
.bx-fx { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity 900ms var(--ease-in-out), visibility 0s linear 900ms; }
/* Lớp không dùng thì dừng hẳn chuyển động. Bộ chọn có .bx đứng trước để thắng thuộc tính animation viết gộp của từng phần tử */
.bx .bx-fx *, .bx .bx-flow i, .bx .bx-ripples i { animation-play-state: paused; }
[data-fx="dem"] .bx-fx--dem, [data-fx="mua"] .bx-fx--mua, [data-fx="quat"] .bx-fx--quat { opacity: 1; visibility: visible; transition: opacity 900ms var(--ease-in-out), visibility 0s; }
.bx[data-fx="dem"] .bx-fx--dem *, .bx[data-fx="mua"] .bx-fx--mua *, .bx[data-fx="quat"] .bx-fx--quat *, .bx[data-fx="suoi"] .bx-flow i, .bx[data-fx="mua"] .bx-ripples i { animation-play-state: running; }
/* Rừng đêm: trời chuyển đêm (lớp phủ mờ dần), trăng, sao, đom đóm, rặng thông */
.bx-night { position: absolute; inset: 0; background: linear-gradient(180deg, var(--bx-sky-night-1) 6%, var(--bx-sky-night-2) 82%); }
.bx-fx--dem .bx-orb { left: 80%; top: 104px; }
.bx-fly { position: absolute; width: 8px; height: 8px; margin: -4px 0 0 -4px; border-radius: 50%; background: radial-gradient(circle, var(--bx-glow) 0 38%, transparent 72%); opacity: 0.85; animation: firefly var(--dur-firefly) var(--ease-in-out) var(--delay, 0ms) infinite; }
.bx-pines { fill: var(--bx-pine); opacity: 0; transition: opacity 900ms var(--ease-in-out); }
[data-fx="dem"] .bx-pines { opacity: 1; }
/* Mưa: hai đám mây xám, hạt mưa xiên rơi (mỗi hạt một lớp, chỉ transform), gợn nước trên cỏ */
.bx-drops { position: absolute; inset: 0; overflow: clip; }
.bx-drops i { position: absolute; top: 96px; width: 2px; height: 15px; border-radius: 2px; background: var(--bx-rain); opacity: 0.8; transform: translate3d(calc(var(--k, 0.5) * -80px), calc(var(--k, 0.5) * 420px), 0) rotate(11deg); animation: bx-drop var(--t, 1.3s) linear var(--d, 0s) infinite; }
@keyframes bx-drop { 0% { transform: translate3d(0, 0, 0) rotate(11deg); opacity: 0; } 12% { opacity: 1; } 82% { opacity: 1; } 100% { transform: translate3d(-92px, 470px, 0) rotate(11deg); opacity: 0; } }
.bx-ripples { position: absolute; left: 0; right: 0; bottom: 0; height: 30px; z-index: 0; pointer-events: none; opacity: 0; visibility: hidden; transition: opacity 900ms var(--ease-in-out), visibility 0s linear 900ms; }
[data-fx="mua"] .bx-ripples { opacity: 1; visibility: visible; transition: opacity 900ms var(--ease-in-out), visibility 0s; }
.bx-ripples i { position: absolute; bottom: 8px; width: 34px; height: 9px; margin-left: -17px; border-radius: 50%; box-shadow: inset 0 0 0 2px var(--bx-rain); opacity: 0.6; transform: scale(0.8); animation: bx-ripple 2.6s var(--ease-out) infinite; }
.bx-ripples i:nth-child(1) { left: 16%; } .bx-ripples i:nth-child(2) { left: 55%; animation-delay: -0.9s; } .bx-ripples i:nth-child(3) { left: 84%; animation-delay: -1.8s; }
@keyframes bx-ripple { 0% { transform: scale(0.2); opacity: 0.9; } 100% { transform: scale(1.3); opacity: 0; } }
/* Suối: dải nước vắt qua chân đồi, vệt sáng trôi theo dòng */
.bx-brook { fill: var(--bx-stream); opacity: 0; transition: opacity 900ms var(--ease-in-out); }
[data-fx="suoi"] .bx-brook { opacity: 1; }
.bx-flow { position: absolute; left: 0; right: 0; bottom: 5px; height: 13px; z-index: 0; overflow: clip; pointer-events: none; opacity: 0; visibility: hidden; transition: opacity 900ms var(--ease-in-out), visibility 0s linear 900ms; }
[data-fx="suoi"] .bx-flow { opacity: 1; visibility: visible; transition: opacity 900ms var(--ease-in-out), visibility 0s; }
.bx-flow i { position: absolute; left: -64px; top: 1px; width: calc(100% + 128px); height: 2px; border-radius: 2px; background: repeating-linear-gradient(90deg, var(--bx-stream-2) 0 16px, transparent 16px 64px); animation: bx-flow 3.2s linear infinite; }
.bx-flow i + i { top: 8px; left: -48px; width: calc(100% + 96px); background: repeating-linear-gradient(90deg, transparent 0 22px, var(--bx-stream-2) 22px 32px, transparent 32px 48px); animation-duration: 2.3s; }
@keyframes bx-flow { to { transform: translateX(64px); } }
.bx-flow i + i { animation-name: bx-flow-2; }
@keyframes bx-flow-2 { to { transform: translateX(48px); } }
/* Gió (quạt): vệt gió lướt qua, lá bay */
.bx-gust { position: absolute; left: 0; width: 140px; height: 24px; opacity: 0.8; transform: translateX(var(--x, 0px)); animation: bx-gust 7.5s var(--ease-in-out) var(--d, 0s) infinite; }
.bx-gust svg { display: block; width: 100%; height: 100%; fill: none; stroke: var(--bx-wind); stroke-width: 3; stroke-linecap: round; }
@keyframes bx-gust { 0% { transform: translateX(-160px); opacity: 0; } 25% { opacity: 1; } 70% { opacity: 1; } 100% { transform: translateX(430px); opacity: 0; } }
.bx-leaf { position: absolute; left: 0; width: 16px; height: 16px; transform: translateX(var(--x, 0px)) rotate(35deg); animation: bx-leaf 11s linear var(--d, 0s) infinite; }
.bx-leaf svg { display: block; width: 100%; height: 100%; }
@keyframes bx-leaf { 0% { transform: translate(-30px, 0) rotate(0deg); } 50% { transform: translate(200px, 26px) rotate(270deg); } 100% { transform: translate(440px, 4px) rotate(540deg); } }

/* ---------- Bạn Mầm ---------- */
.bx-kid { position: relative; transform-origin: 50% 90%; animation: kid-breathe 8s var(--ease-breath) infinite alternate; }
.bx-kid svg { display: block; width: 100%; height: auto; overflow: visible; }
@keyframes kid-breathe { from { transform: scale(1); } to { transform: scale(1.035, 1.045); } }
.kid-leaves { transform-box: view-box; transform-origin: 60px 50px; animation: kid-sway 5.2s var(--ease-in-out) infinite alternate; }
@keyframes kid-sway { from { transform: rotate(-5deg); } to { transform: rotate(5deg); } }
[data-fx="quat"] .kid-leaves { animation-duration: 1.5s; }
.kid-eyes--calm, .kid-eyes--joy { display: none; }
.b3.is-running .kid-eyes--main, .b5:not([data-fx=""]) .kid-eyes--main { display: none; }
.b3.is-running .kid-eyes--calm, .b5:not([data-fx=""]) .kid-eyes--calm { display: inline; }
.b3.is-over .kid-eyes--calm { display: none; }
.b3.is-over .kid-eyes--joy { display: inline; }
.kid-umbrella { opacity: 0; transition: opacity 700ms var(--ease-out); }
[data-fx="mua"] .kid-umbrella { opacity: 1; }
.kid-steam path { fill: none; stroke: var(--bx-steam); stroke-width: 2; stroke-linecap: round; transform-box: fill-box; transform-origin: 50% 100%; animation: kid-steam 3.4s var(--ease-out) infinite; }
.kid-steam path + path { animation-delay: -1.7s; }
@keyframes kid-steam { 0% { opacity: 0; transform: translateY(4px) scaleY(0.6); } 30% { opacity: 1; } 100% { opacity: 0; transform: translateY(-6px); } }

/* ---------- B02: bông hoa thở trong vòng nhịp ---------- */
.b2 .bx-stage { padding-top: var(--space-sm); }
.b2-ring { position: relative; width: clamp(188px, min(72vw, 36svh), 296px); aspect-ratio: 1; }
.b2-ring__svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.b2-halos { transform-box: view-box; transform-origin: 120px 120px; }
.b2:not(.is-running) .b2-halos { animation: b2-idle 6s var(--ease-breath) infinite alternate; }
@keyframes b2-idle { from { transform: scale(0.93); } to { transform: scale(1.03); } }
.b2-halo { fill: var(--bx-halo); transform-box: view-box; transform-origin: 120px 120px; transform: scale(calc(0.42 + var(--open, 0.45) * 0.58)); transition: transform var(--phase-ms, 4000ms) var(--ease-breath); }
.b2-halo:nth-child(2) { transition-delay: 110ms; }
.b2-halo:nth-child(3) { transition-delay: 220ms; }
.b2-track { fill: none; stroke: var(--bx-track); stroke-width: 14; }
.b2-arc { fill: none; stroke-width: 7; stroke-linecap: round; transition: opacity var(--dur-long) var(--ease-out); }
.b2-arc--in { stroke: var(--bx-ph-in); } .b2-arc--out { stroke: var(--bx-ph-out); } .b2-arc--hold { stroke: var(--bx-ph-hold); }
.b2.is-running .b2-arc { opacity: 0.4; }
.b2.is-running .b2-arc.is-on { opacity: 1; }
.b2-dot { transform-box: view-box; transform-origin: 120px 120px; transform: rotate(var(--rot, 0deg)); transition: transform var(--phase-ms, 4000ms) linear; }
.b2-dot__glow { fill: var(--color-select); opacity: 0.2; }
.b2-dot__core { fill: var(--color-select); stroke: var(--bx-dot-ring); stroke-width: 2.5; }
.b2-flower { position: absolute; inset: 20%; }
.b2-flower .bloom { width: 100%; height: 100%; }
.b2 .breath__phase { min-height: 1.28em; }
.b2-beads { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; min-height: 1.75rem; margin-top: calc(-1 * var(--space-xs)); }
.b2:not(.is-running) .b2-beads { display: none; }
.b2-key { white-space: nowrap; }
.b2-key::before { content: ""; display: inline-block; width: 0.62em; height: 0.62em; margin-right: 0.32em; border-radius: 50%; background: var(--bx-ph-in); box-shadow: 0 0 0 1.5px var(--color-card); vertical-align: 0.04em; }
.b2-key--out::before { background: var(--bx-ph-out); }
.b2-key--hold::before { background: var(--bx-ph-hold); }
.b2-beads i { display: grid; place-items: center; width: 1.75rem; height: 1.75rem; border-radius: 50%; box-shadow: inset 0 0 0 2px var(--color-select); color: var(--color-ink); font: normal var(--weight-strong) var(--text-xs)/1 var(--font-body); font-variant-numeric: tabular-nums; }
.b2-beads i.is-on { background: var(--color-select); color: var(--color-select-ink); animation: b2-bead 460ms var(--ease-spring); }
@keyframes b2-bead { from { transform: scale(0.6); } }
.b2-ctl { display: grid; justify-items: center; align-content: start; width: 100%; min-height: 7.4rem; }
.b2.is-running .b2-ctl { min-height: calc(7.4rem - 1.75rem - var(--space-md) + var(--space-xs)); } /* hàng hạt hiện ra khi thở: tổng chiều cao giữ nguyên, vòng hoa không nhảy */
.b2-garden-box { position: absolute; left: 0; right: 0; bottom: 0; height: 110px; z-index: -1; pointer-events: none; }
.b2-garden { display: block; width: 100%; height: 100%; }
.b2-fl { transform-box: fill-box; transform-origin: 50% 100%; transform: scale(0); transition: transform 760ms var(--ease-spring); }
.b2-fl.is-on { transform: scale(1); }

/* ---------- B03: Mầm ngồi thiền trong vòng giờ ---------- */
.b3-ring { position: relative; width: clamp(176px, min(62vw, 29svh), 256px); aspect-ratio: 1; }
.b3.is-running .b3-ring { width: clamp(204px, min(74vw, 38svh), 296px); }
.b3-ring__svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.b3-track { fill: none; stroke: var(--bx-track); stroke-width: 12; }
.b3-fill { fill: none; stroke: var(--color-select); stroke-width: 12; stroke-linecap: round; }
.b3-head { transform-box: view-box; transform-origin: 120px 120px; transition: transform 260ms linear; }
.b3-head__glow { fill: var(--color-select); opacity: 0.22; transform-box: fill-box; transform-origin: center; animation: b3-glow 2.6s var(--ease-in-out) infinite alternate; }
@keyframes b3-glow { from { opacity: 0.14; transform: scale(0.8); } to { opacity: 0.3; transform: scale(1.15); } }
.b3-head__core { fill: var(--color-card); stroke: var(--color-select); stroke-width: 4; }
.b3-disc { position: absolute; inset: 10%; display: grid; place-items: center; align-content: center; border-radius: 50%; background: var(--bx-disc); }
.b3-disc .bx-kid { width: 60%; margin-top: -4%; }
.b3-disc b { margin-top: -2px; color: var(--color-ink); font-size: clamp(1.6rem, 7.8vw, 2.25rem); font-weight: var(--weight-strong); line-height: 1.05; font-variant-numeric: tabular-nums; }
.b3 .bell-wave { z-index: 1; }
.b3-setup { width: 100%; gap: var(--space-sm); text-align: left; }
.b3 .opts > legend { color: var(--color-ink); }
.b3 .opts--sound .opts__grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.b3 .opts--sound .opts__grid label { grid-column: span 2; grid-auto-flow: column; justify-content: center; align-items: center; gap: var(--space-2xs); min-height: var(--tap); padding-inline: var(--space-xs); overflow-wrap: normal; }
.b3 .opts--sound .opts__grid label:nth-of-type(n+4) { grid-column: span 3; }
.b3 .opts--sound .opts__grid label .icon { width: 20px; height: 20px; }
:root[data-text="200"] .b3 .opts--sound .opts__grid label { grid-column: auto; justify-content: start; }
.b3-note { color: var(--color-ink-2); }
.b3.is-running .b3-note { color: var(--color-ink); font-weight: var(--weight-strong); }

/* ---------- B04: tranh theo bài, câu dẫn trong thẻ ---------- */
.b4-art { position: relative; width: clamp(136px, 44vw, 188px); }
.b4-art .bx-kid { width: 100%; }
.b4:not(.is-playing) .bx-kid { animation-play-state: paused; }
.b4 .zzz { right: -18px; top: 8px; }
.b4-hearts { position: absolute; inset: 0; pointer-events: none; }
.b4-hearts i { position: absolute; bottom: 42%; width: 13px; height: 12px; background: var(--art-pink-2); opacity: 0.85; -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 13 12'%3E%3Cpath d='M6.5 12C1 8 0 5.2 0 3.4 0 1.4 1.5 0 3.3 0 4.6 0 5.8.8 6.5 2 7.2.8 8.4 0 9.7 0 11.5 0 13 1.4 13 3.4 13 5.2 12 8 6.5 12Z'/%3E%3C/svg%3E") center / contain no-repeat; mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 13 12'%3E%3Cpath d='M6.5 12C1 8 0 5.2 0 3.4 0 1.4 1.5 0 3.3 0 4.6 0 5.8.8 6.5 2 7.2.8 8.4 0 9.7 0 11.5 0 13 1.4 13 3.4 13 5.2 12 8 6.5 12Z'/%3E%3C/svg%3E") center / contain no-repeat; animation: b4-heart 4.2s var(--ease-out) infinite; }
.b4-hearts i:nth-child(1) { left: -6%; } .b4-hearts i:nth-child(2) { left: 96%; animation-delay: -1.4s; transform: scale(0.8); } .b4-hearts i:nth-child(3) { left: 14%; bottom: 66%; animation-delay: -2.8s; transform: scale(0.7); }
@keyframes b4-heart { 0% { opacity: 0; transform: translateY(8px) scale(0.6); } 25% { opacity: 0.9; } 100% { opacity: 0; transform: translateY(-34px) scale(1); } }
.b4-card { display: grid; gap: var(--space-sm); width: 100%; padding: var(--space-md); border-radius: var(--radius-card); background: var(--color-card); color: var(--color-ink); box-shadow: var(--shadow-card); }
.b4 .captions { display: flex; flex-direction: column; justify-content: center; gap: var(--space-xs); min-height: 5.6em; padding: 0; border-radius: 0; background: none; text-align: center; }
.b4 .captions p { max-width: none; color: var(--color-muted); line-height: var(--leading-ui); }
.b4 .captions p:has(+ p + p.is-now) { font-size: var(--text-sm); }
.b4 .captions p.is-now { color: var(--color-ink); font-weight: var(--weight-strong); font-size: var(--text-lg); }
.b4-steps { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; }
.b4-steps i { width: 8px; height: 8px; border-radius: var(--radius-pill); box-shadow: inset 0 0 0 1.5px var(--color-edge); }
.b4-steps i.is-done { background: var(--color-select); box-shadow: none; }
.b4-steps i.is-now { width: 22px; background: var(--color-select); box-shadow: none; }
.b4-prog { --v: 0; position: relative; width: 100%; height: 30px; }
.b4-prog__track { position: absolute; left: 15px; right: 15px; top: 50%; height: 10px; margin-top: -5px; border-radius: var(--radius-pill); background: var(--bx-track); overflow: clip; }
.b4-prog__track i { display: block; height: 100%; border-radius: inherit; background: var(--color-select); transform-origin: left center; transform: scaleX(var(--v)); transition: transform 260ms linear; }
.b4-prog__run { position: absolute; left: 15px; right: 15px; top: 0; bottom: 0; transform: translateX(calc(var(--v) * 100%)); transition: transform 260ms linear; }
.b4-prog__head { position: absolute; left: 0; top: 50%; display: grid; place-items: center; width: 30px; height: 30px; margin: -15px 0 0 -15px; border-radius: 50%; background: var(--color-card); box-shadow: inset 0 0 0 2px var(--color-select); }
.b4-prog__sprout { width: 20px; height: 20px; }
.b4-time { margin-top: calc(-1 * var(--space-xs)); }
.b4-play { min-width: 11rem; }
.b4-poc { color: var(--color-ink-2); }

/* ---------- B05: đang phát ở vùng trời, ô tranh nhỏ, thẻ điều chỉnh ---------- */
.b5 .bx-head { padding-bottom: 32px; }
.b5-hero { gap: var(--space-xs); padding-top: 0; }
.b5-hero .bx-kid { width: clamp(84px, 24vw, 104px); }
.b5-status { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-xs); min-height: 44px; max-width: 100%; padding: var(--space-2xs) var(--space-md) var(--space-2xs) var(--space-sm); border-radius: var(--radius-pill); background: var(--color-card); color: var(--color-ink); box-shadow: var(--shadow-card); line-height: var(--leading-ui); font-variant-numeric: tabular-nums; }
.b5-status__ic { display: grid; place-items: center; flex: 0 0 auto; width: 28px; height: 28px; border-radius: 50%; background: var(--color-select); color: var(--color-select-ink); }
.b5-status__ic .icon { display: none; width: 18px; height: 18px; }
.b5[data-fx=""] .b5-ic--loa, .b5[data-fx="mua"] .b5-ic--mua, .b5[data-fx="suoi"] .b5-ic--suoi, .b5[data-fx="dem"] .b5-ic--dem, .b5[data-fx="quat"] .b5-ic--quat { display: block; }
.b5.is-sleep:not([data-fx=""]) .b5-status__ic .icon { display: none; }
.b5.is-sleep:not([data-fx=""]) .b5-status__ic .b5-ic--dongho { display: block; }
.b5-tiles { width: 100%; }
.b5-tile { justify-items: stretch; gap: var(--space-xs); min-height: 0; padding: var(--space-xs); transition: transform var(--dur-micro) var(--ease-out); }
.b5-tile:active { transform: scale(0.98); }
.b5-tile__name { display: flex; align-items: center; gap: var(--space-xs); min-height: 28px; padding: 0 var(--space-2xs); line-height: var(--leading-ui); }
.b5-tile__name .icon { width: 22px; height: 22px; color: var(--color-select); }
.b5-tile .eq { margin-left: auto; height: 14px; }
.b5-art { position: relative; display: block; width: 100%; height: 58px; border-radius: 14px; overflow: clip; }
.b5-art svg { display: block; width: 100%; height: 100%; }
.b5-art--mua { background: linear-gradient(180deg, var(--bx-sky-day-1), var(--bx-sky-day-2)); }
.b5-art--suoi { background: linear-gradient(180deg, var(--bx-sky-dawn-1), var(--bx-sky-dawn-2)); }
.b5-art--dem { background: linear-gradient(180deg, var(--bx-sky-night-1), var(--bx-sky-night-2)); }
.b5-art--quat { background: linear-gradient(180deg, var(--bx-sky-dusk-1), var(--bx-sky-dusk-2)); }
.b5-cloud { fill: var(--bx-cloud-rain); }
.b5-drops path { fill: none; stroke: var(--bx-rain-solid); stroke-width: 2; stroke-linecap: round; opacity: 0.75; }
.b5-puddle, .b5-brook { fill: var(--bx-stream); }
.b5-waves path { fill: none; stroke: var(--bx-stream-2); stroke-width: 1.8; stroke-linecap: round; }
.b5-tw { fill: var(--bx-star); }
.b5-ff { fill: var(--bx-glow); transform-box: fill-box; transform-origin: center; }
.b5-wind path { fill: none; stroke: var(--bx-wind); stroke-width: 2.4; stroke-linecap: round; opacity: 0.85; }
.b5-blades { fill: var(--art-bowl-2); transform-box: view-box; transform-origin: 82px 26px; }
.b5-tile[aria-pressed="true"] .b5-drops path { animation: b5-drop 0.9s linear infinite; }
.b5-tile[aria-pressed="true"] .b5-waves { animation: b5-flow 1.6s linear infinite; }
.b5-tile[aria-pressed="true"] .b5-tw { animation: bx-twinkle 1.8s var(--ease-in-out) infinite alternate; }
.b5-tile[aria-pressed="true"] .b5-ff { animation: b5-ff 3.2s var(--ease-in-out) infinite alternate; }
.b5-tile[aria-pressed="true"] .b5-blades { animation: sc-spin 1.4s linear infinite; }
.b5-tile[aria-pressed="true"] .b5-wind path { animation: b5-wind 2.6s var(--ease-in-out) infinite; }
@keyframes b5-drop { 0% { opacity: 0; transform: translate(0, -4px); } 20% { opacity: 1; } 100% { opacity: 0; transform: translate(-4px, 18px); } }
@keyframes b5-flow { to { transform: translateX(40px); } }
@keyframes b5-ff { from { opacity: 0.45; transform: translate(0, 0); } to { opacity: 1; transform: translate(6px, -6px); } }
@keyframes b5-wind { 0% { opacity: 0; transform: translateX(-10px); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateX(14px); } }
.b5-panel { display: grid; gap: var(--space-md); width: 100%; text-align: left; }
.b5-vol { display: flex; flex-wrap: wrap; align-items: center; gap: 0 var(--space-sm); }
.b5-vol .range { flex: 1 1 8rem; width: auto; min-width: 0; }
.b5-sleep { display: grid; gap: var(--space-xs); }
.b5-note { font-size: var(--text-sm); line-height: var(--leading-ui); }

/* ---------- Chữ 200% ---------- */
:root[data-text="200"] .b2-ring { width: clamp(168px, 62vw, 236px); }
:root[data-text="200"] .b2-beads i { width: 1.5rem; height: 1.5rem; }
:root[data-text="200"] .b3-ring, :root[data-text="200"] .b3.is-running .b3-ring { width: clamp(196px, 70vw, 268px); }
:root[data-text="200"] .b3-disc .bx-kid { width: 44%; }
:root[data-text="200"] .b3-disc b { font-size: 2.1rem; }

/* ---------- Giảm chuyển động: cảnh đứng yên ở chỗ đẹp; nhịp thở báo bằng chữ, cỡ hoa, cung đang sáng và hạt đếm giây ---------- */
@media (prefers-reduced-motion: reduce) {
  .bx-cloud, .bx-orb, .bx-star, .bx-fly, .bx-drops i, .bx-ripples i, .bx-flow i, .bx-gust, .bx-leaf, .bx-kid, .kid-leaves, .kid-steam path, .b2-halos, .b2-beads i, .b3-head__glow, .b4-hearts i, .b5-drops path, .b5-waves, .b5-tw, .b5-ff, .b5-blades, .b5-wind path { animation: none !important; }
  .b2-dot { display: none; }
  .b2.is-running .b2-arc.is-on { stroke-width: 11; }
}
:root[data-motion="reduce"] .bx-cloud, :root[data-motion="reduce"] .bx-orb, :root[data-motion="reduce"] .bx-star, :root[data-motion="reduce"] .bx-fly, :root[data-motion="reduce"] .bx-drops i, :root[data-motion="reduce"] .bx-ripples i, :root[data-motion="reduce"] .bx-flow i, :root[data-motion="reduce"] .bx-gust, :root[data-motion="reduce"] .bx-leaf,
:root[data-motion="reduce"] .bx-kid, :root[data-motion="reduce"] .kid-leaves, :root[data-motion="reduce"] .kid-steam path, :root[data-motion="reduce"] .b2-halos, :root[data-motion="reduce"] .b2-beads i, :root[data-motion="reduce"] .b3-head__glow, :root[data-motion="reduce"] .b4-hearts i,
:root[data-motion="reduce"] .b5-drops path, :root[data-motion="reduce"] .b5-waves, :root[data-motion="reduce"] .b5-tw, :root[data-motion="reduce"] .b5-ff, :root[data-motion="reduce"] .b5-blades, :root[data-motion="reduce"] .b5-wind path { animation: none !important; }
:root[data-motion="reduce"] .b2-dot { display: none; }
:root[data-motion="reduce"] .b2.is-running .b2-arc.is-on { stroke-width: 11; }