:root {
  --ink: #18201c;
  --soft: #566159;
  --paper: #f4f2ea;
  --surface: rgba(255, 255, 252, 0.93);
  --line: rgba(42, 65, 54, 0.17);
  --moss: #2f6d57;
  --moss-dark: #21503f;
  --moss-pale: #e8f0eb;
  --clay: #a65f45;
  --warm: #f1e7d7;
  --danger: #8d3a34;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Songti SC", "STSong", serif;
  --hand: "Kaiti SC", "STKaiti", "KaiTi", cursive;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--paper); }
body { margin: 0; min-width: 320px; min-height: 100dvh; background: linear-gradient(180deg, rgba(249,248,243,.26), rgba(244,242,234,.88)); }
button { font: inherit; cursor: pointer; }
button:focus-visible, a:focus-visible { outline: 3px solid rgba(166,95,69,.38); outline-offset: 3px; }
[hidden] { display: none !important; }

.ambient { position: fixed; z-index: -1; inset: 0; background: linear-gradient(90deg, rgba(255,252,244,.08), rgba(255,252,244,.24)), url("../assets/ambient-monstera-v1.jpg") center/cover; opacity: .76; pointer-events: none; transition: opacity .4s ease; }
body:not([data-screen="choose"]) .ambient { opacity: .4; }
body[data-screen="breath"] .ambient { opacity: .3; filter: saturate(.72) brightness(1.03); }
.skip-link { position: fixed; z-index: 10; top: 10px; left: 10px; padding: 10px 14px; color: white; background: var(--moss-dark); border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.shell { width: min(calc(100% - 28px), 680px); margin: 0 auto; padding: max(24px, env(safe-area-inset-top)) 0 max(26px, env(safe-area-inset-bottom)); }
.brand { display: flex; align-items: center; gap: 2px; margin: 0 4px 14px; }
.brand-logo { display: block; width: 148px; height: auto; margin: -12px -10px -12px -20px; }
.brand-tagline { max-width: 13em; color: var(--soft); font-size: 12px; line-height: 1.45; }
.brand p { margin: 0 0 2px; font-family: var(--hand); font-size: 27px; font-weight: 700; letter-spacing: -.11em; transform: rotate(-1.5deg); transform-origin: left center; }
.brand div > span { color: var(--soft); font-size: 12px; }
.wave-mark { display: flex; align-items: center; justify-content: center; gap: 2px; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 47% 53% 44% 56% / 57% 43% 56% 44%; background: rgba(255,255,252,.66); transform: rotate(-2deg); }
.wave-mark i { width: 2px; border-radius: 8px; background: var(--moss); }
.wave-mark i:nth-child(1), .wave-mark i:nth-child(5) { height: 7px; }
.wave-mark i:nth-child(2), .wave-mark i:nth-child(4) { height: 15px; }
.wave-mark i:nth-child(3) { height: 23px; }

.panel { padding: clamp(24px, 6vw, 42px); border: 1px solid var(--line); border-radius: 26px; background: var(--surface); box-shadow: 0 24px 70px rgba(35,54,45,.1), 0 2px 8px rgba(35,54,45,.04); backdrop-filter: blur(18px); }
.kicker { margin: 0 0 8px; color: var(--moss); font-size: 12px; font-weight: 800; letter-spacing: .16em; }
h1 { margin: 0 0 14px; font-family: var(--display); font-size: clamp(30px, 8vw, 44px); line-height: 1.14; letter-spacing: -.045em; text-wrap: balance; }
.lead { margin: 0 0 26px; color: #34413a; font-size: 16px; line-height: 1.72; }
.lead.compact { margin-bottom: 20px; }
.scenario-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.scenario-button { min-height: 92px; padding: 15px; border: 1px solid var(--line); border-radius: 17px; color: var(--ink); background: rgba(255,255,252,.78); text-align: left; transition: border-color .15s ease, transform .15s ease, background .15s ease; }
.scenario-button:hover { border-color: rgba(47,109,87,.42); background: var(--moss-pale); transform: translateY(-1px); }
.scenario-button strong, .scenario-button span { display: block; }
.scenario-button strong { margin-bottom: 7px; font-size: 15px; line-height: 1.35; }
.scenario-button span { color: var(--moss); font-size: 12px; font-weight: 750; }
.disclosure { margin: 20px 0 0; color: var(--soft); font-size: 12px; text-align: center; }

.back-button, .text-button { padding: 8px 0; border: 0; color: var(--moss-dark); background: transparent; font-weight: 750; }
.back-button { margin-bottom: 20px; }
.transition-label { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; color: var(--soft); font-size: 13px; }
.transition-label i { color: var(--clay); font-style: normal; }
.transition-label strong { color: var(--moss-dark); }
.player-card { display: grid; grid-template-columns: 62px 1fr; align-items: center; gap: 15px; padding: 18px; border: 1px solid rgba(47,109,87,.17); border-radius: 20px; background: linear-gradient(135deg, rgba(232,240,235,.95), rgba(255,254,250,.92)); }
.play-button { grid-row: 1 / span 2; width: 62px; height: 62px; border: 0; border-radius: 50%; color: white; background: var(--moss); box-shadow: 0 10px 24px rgba(47,109,87,.2); font-size: 19px; }
.play-button:hover { background: var(--moss-dark); }
.player-copy { min-width: 0; }
.player-copy strong, .player-copy span { display: block; }
.player-copy strong { margin-bottom: 5px; font-size: 16px; }
.player-copy span { color: var(--soft); font-size: 13px; font-variant-numeric: tabular-nums; }
.progress { grid-column: 2; height: 4px; overflow: hidden; border-radius: 8px; background: rgba(47,109,87,.13); }
.progress i { display: block; width: 0; height: 100%; background: var(--clay); transition: width .2s linear; }
.status { min-height: 23px; margin: 12px 0 16px; color: var(--soft); font-size: 13px; line-height: 1.6; }
.adjustments { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 14px; }
.adjustments button, .feedback-options button { min-height: 48px; border: 1px solid var(--line); border-radius: 14px; color: var(--ink); background: rgba(255,255,252,.82); font-weight: 720; }
.adjustments button[aria-pressed="true"] { border-color: rgba(47,109,87,.42); color: var(--moss-dark); background: var(--moss-pale); }
.adjustments button:disabled { cursor: not-allowed; color: #7c817c; background: rgba(247,244,235,.7); opacity: .72; }
.primary { width: 100%; min-height: 54px; padding: 14px 18px; border: 0; border-radius: 14px; color: white; background: var(--moss); font-weight: 800; box-shadow: 0 10px 24px rgba(47,109,87,.16); }
.primary:disabled { cursor: not-allowed; opacity: .48; box-shadow: none; }
.primary:not(:disabled):hover { background: var(--moss-dark); }

.feedback-options { display: grid; gap: 10px; }
.feedback-options button { font-size: 16px; }
.feedback-options button:hover { border-color: rgba(47,109,87,.42); background: var(--moss-pale); }
.return-question { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); }
.return-question p { margin: 0 0 14px; font-weight: 750; }
.done-panel { text-align: center; }
.done-mark { display: grid; place-items: center; width: 58px; height: 58px; margin: 0 auto 18px; border-radius: 50%; color: white; background: var(--moss); font-size: 26px; }
.done-panel .text-button { margin-top: 14px; }
footer { max-width: 46em; margin: 22px auto 0; color: var(--soft); font-size: 12px; line-height: 1.6; text-align: center; }

body[data-screen="breath"] .brand,
body[data-screen="breath"] footer { display: none; }
body[data-screen="breath"] .shell { width: min(calc(100% - 28px), 760px); padding-top: max(18px, env(safe-area-inset-top)); }
.breath-panel { min-height: calc(100dvh - max(36px, env(safe-area-inset-top)) - max(26px, env(safe-area-inset-bottom))); display: flex; flex-direction: column; align-items: center; justify-content: space-between; padding: clamp(22px, 6vw, 50px) 12px; text-align: center; opacity: 1; transition: opacity 1.7s ease; }
.breath-head p:last-child { margin: 0; color: var(--soft); font-size: 14px; }
.breath-head h1 { margin-bottom: 10px; }
.breath-stage { position: relative; display: grid; place-items: center; width: min(76vw, 330px); aspect-ratio: 1; margin: 28px 0; }
.breath-orbit { display: grid; place-items: center; width: 76%; aspect-ratio: 1; border: 1px solid rgba(47,109,87,.2); border-radius: 50%; background: radial-gradient(circle, rgba(255,255,252,.82), rgba(232,240,235,.4) 58%, rgba(47,109,87,.05)); box-shadow: 0 0 0 18px rgba(47,109,87,.035), 0 30px 80px rgba(47,109,87,.13); animation: breathe 10s ease-in-out infinite; }
.breath-core { width: 34%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 38% 34%, #f8efe2, #9ebaaa 72%, #6b9480); box-shadow: 0 0 45px rgba(47,109,87,.24); }
.breath-phase { position: absolute; color: var(--moss-dark); font-family: var(--display); font-size: 22px; letter-spacing: .16em; transform: translateX(.08em); }
.immersion-time { position: absolute; bottom: 4%; color: var(--soft); font-size: 12px; font-variant-numeric: tabular-nums; letter-spacing: .08em; }
.breath-controls { display: flex; align-items: center; justify-content: center; gap: 12px; }
.quiet-control { min-width: 112px; min-height: 46px; padding: 11px 18px; border: 1px solid rgba(47,109,87,.19); border-radius: 999px; color: var(--moss-dark); background: rgba(255,255,252,.58); font-weight: 720; backdrop-filter: blur(10px); }
.quiet-control:hover { border-color: rgba(47,109,87,.4); background: rgba(232,240,235,.74); }
.breath-stage { transition: opacity 1.7s ease, transform 1.7s ease; }
body.ending-session .breath-panel { opacity: .28; }
body.ending-session .breath-stage { opacity: .35; transform: scale(.92); }

@keyframes breathe {
  0%, 100% { transform: scale(.78); opacity: .74; }
  50% { transform: scale(1); opacity: 1; }
}

@media (max-width: 440px) {
  .shell { width: min(calc(100% - 20px), 680px); }
  .panel { padding: 24px 18px; border-radius: 22px; }
  .scenario-grid { grid-template-columns: 1fr; }
  .scenario-button { min-height: 72px; }
  .adjustments { grid-template-columns: 1fr; }
  .breath-controls { width: 100%; }
  .quiet-control { flex: 1; min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
  .breath-orbit { animation: none; transform: scale(.9); }
}

@media (prefers-contrast: more) {
  :root { --line: rgba(24,32,28,.42); }
  .panel { background: #fffefa; }
}