:root {
  --paper: #f3f7fb;
  --white: rgba(255, 255, 255, 0.78);
  --solid: #ffffff;
  --mist: #e7f3fa;
  --water: #0e7eae;
  --water-2: #49b4dc;
  --deep: #08324c;
  --navy: #071e30;
  --ink: #10283a;
  --muted: #5a7082;
  --line: rgba(14, 90, 130, 0.14);
  --good: #1d7a4e;
  --warn: #8a5a12;
  --alert: #8d2f2f;
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --shadow: 0 24px 60px rgba(8, 40, 68, 0.1);
  --ease: cubic-bezier(0.22, 0.7, 0.2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--deep); }
button, input, select { font: inherit; }
:focus-visible { outline: 3px solid #8fd0ea; outline-offset: 3px; }

.aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.aurora span {
  position: absolute;
  border-radius: 50%;
  filter: blur(30px);
  opacity: 0.7;
  animation: floaty 16s ease-in-out infinite;
}
.aurora span:nth-child(1) {
  width: 520px; height: 520px;
  left: -120px; top: -80px;
  background: radial-gradient(circle, rgba(120, 198, 230, 0.55), transparent 68%);
}
.aurora span:nth-child(2) {
  width: 460px; height: 460px;
  right: -80px; top: 120px;
  background: radial-gradient(circle, rgba(14, 126, 174, 0.22), transparent 70%);
  animation-delay: -6s;
}
.aurora span:nth-child(3) {
  width: 380px; height: 380px;
  left: 30%; bottom: -120px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.9), transparent 70%);
  animation-duration: 22s;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--navy);
  color: #fff;
  padding: 8px 12px;
  z-index: 50;
}
.skip:focus { top: 12px; }

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  background: rgba(8, 50, 76, 0.08);
  z-index: 40;
}
.topbar span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #b7e4f6, #0e7eae 55%, #08324c);
  box-shadow: 0 0 16px rgba(14, 126, 174, 0.55);
}

.level {
  position: fixed;
  left: 22px;
  top: 26vh;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.22em;
}
.level-glass {
  width: 22px;
  height: 196px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.55), rgba(255,255,255,0.2));
  border: 1px solid rgba(255,255,255,0.8);
  box-shadow: inset 0 0 0 1px rgba(14,126,174,0.15), 0 12px 30px rgba(8,50,76,0.12);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
}
.level-water {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 0;
  background: linear-gradient(180deg, rgba(186, 228, 245, 0.95), #1490c4 45%, #0b5f86);
  transition: height 0.25s linear;
}
.level-water::before,
.level-water::after {
  content: "";
  position: absolute;
  left: -40%;
  width: 180%;
  height: 14px;
  top: -8px;
  background: rgba(255,255,255,0.55);
  border-radius: 50%;
  animation: wave 2.4s ease-in-out infinite;
}
.level-water::after { top: -2px; opacity: 0.45; animation-delay: -1.2s; }

header.site, .drawer, main, footer.site { position: relative; z-index: 1; }
header.site {
  position: sticky;
  top: 0;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 32px;
  background: rgba(243, 247, 251, 0.72);
  backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid rgba(255,255,255,0.7);
  box-shadow: 0 10px 30px rgba(8, 40, 68, 0.04);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--navy);
  font-family: var(--serif);
  font-size: 18px;
}
.drop {
  width: 26px;
  height: 32px;
  background: linear-gradient(160deg, #fff 0%, #8fd4ee 38%, #0e7eae 100%);
  border-radius: 50% 50% 50% 50% / 38% 38% 62% 62%;
  transform: rotate(45deg);
  box-shadow: inset -5px -7px 0 rgba(255,255,255,0.45), 0 8px 16px rgba(14,126,174,0.28);
  animation: drip 3.4s ease-in-out infinite;
}
.nav-desk { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.nav-desk a, .drawer a {
  position: relative;
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 999px;
  transition: color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav-desk a:hover { color: var(--deep); background: rgba(255,255,255,0.7); }
.nav-desk a.is-on, .drawer a.is-on {
  color: var(--deep);
  font-weight: 700;
  background: rgba(255,255,255,0.9);
}
.menu-btn {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.8);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
}
.drawer {
  display: none;
  padding: 8px 22px 18px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.drawer.open { display: grid; gap: 6px; }

.wrap { width: min(1100px, calc(100% - 56px)); margin: 0 auto; }
.hero { padding: 72px 0 28px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero-grid > div > * { animation: rise 0.9s var(--ease) both; }
.hero-grid > div > *:nth-child(2) { animation-delay: 0.12s; }
.hero-grid > div > *:nth-child(3) { animation-delay: 0.24s; }
.hero-grid > div > *:nth-child(4) { animation-delay: 0.36s; }
.kicker {
  letter-spacing: 0.22em;
  color: var(--water);
  font-size: 12px;
  margin: 0 0 14px;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.3; letter-spacing: 0.01em; }
h1 {
  font-size: clamp(38px, 4.8vw, 64px);
  margin: 0 0 16px;
  color: var(--navy);
}
.sub { color: var(--muted); font-size: 18px; margin: 0 0 26px; max-width: 38em; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  border-radius: 999px;
  padding: 13px 20px;
  border: 1px solid transparent;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.btn.primary {
  background: linear-gradient(180deg, #1b95c8 0%, #0c648f 100%);
  color: #fff;
  box-shadow: 0 12px 28px rgba(12, 90, 130, 0.28), inset 0 1px 0 rgba(255,255,255,0.35);
}
.btn.primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 20%, rgba(255,255,255,0.45) 48%, transparent 70%);
  transform: translateX(-130%);
  animation: sheen 3.8s ease-in-out infinite;
}
.btn.ghost {
  background: rgba(255,255,255,0.72);
  color: var(--deep);
  border-color: rgba(14,126,174,0.16);
  box-shadow: 0 8px 20px rgba(8,40,68,0.05);
  backdrop-filter: blur(8px);
}
.btn:hover { transform: translateY(-2px); }
.hero-photo {
  position: relative;
  border-radius: 36px;
  overflow: hidden;
  min-height: 460px;
  box-shadow: var(--shadow), 0 0 0 1px rgba(255,255,255,0.6);
  animation: photoIn 1.1s var(--ease) both;
}
.hero-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 35%, rgba(255,255,255,0.38) 48%, transparent 60%);
  transform: translateX(-80%);
  animation: sheen 5.5s ease-in-out infinite;
  pointer-events: none;
}
.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 460px;
  animation: drift 8s ease-in-out infinite alternate;
}
.hero-photo figcaption {
  position: absolute;
  left: 18px;
  bottom: 18px;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(10px);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  box-shadow: 0 8px 20px rgba(8,40,68,0.08);
}

.chapter-map { padding: 18px 0 48px; }
.chapter-map ol {
  list-style: none;
  padding: 0;
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.chapter-map a {
  display: block;
  height: 100%;
  text-decoration: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.7));
  border: 1px solid rgba(255,255,255,0.9);
  border-radius: 20px;
  padding: 18px 18px 16px;
  min-height: 104px;
  color: var(--ink);
  box-shadow: 0 10px 30px rgba(8, 40, 68, 0.05);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s;
}
.chapter-map a:hover {
  transform: translateY(-6px);
  border-color: rgba(14,126,174,0.35);
  box-shadow: 0 18px 40px rgba(14, 90, 130, 0.14);
}
.chapter-map small {
  display: block;
  color: var(--water);
  letter-spacing: 0.16em;
  font-size: 12px;
  margin-bottom: 6px;
}

.chapter { padding: 84px 0; }
.chapter:nth-child(even) {
  background: linear-gradient(180deg, rgba(255,255,255,0.35), rgba(214, 235, 246, 0.35));
}
.eyebrow {
  color: var(--water);
  letter-spacing: 0.2em;
  font-size: 12px;
  margin: 0 0 8px;
}
.chapter h2 { font-size: clamp(32px, 3.2vw, 46px); margin: 0 0 14px; color: var(--navy); }
.lead { font-size: 18px; color: var(--muted); max-width: 46em; }
.split, .two { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 28px; align-items: start; }
figure {
  margin: 0;
  background: rgba(255,255,255,0.8);
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.9);
  box-shadow: var(--shadow);
}
figure img { width: 100%; height: auto; transition: transform 0.8s var(--ease); }
figure:hover img { transform: scale(1.03); }
figcaption { padding: 12px 16px 16px; color: var(--muted); font-size: 13px; }
.scene, .take, .note, .panel, .card, .calc, .day, .myth, .source-list li {
  background: linear-gradient(180deg, rgba(255,255,255,0.94), rgba(255,255,255,0.78));
  border: 1px solid rgba(14, 90, 130, 0.08);
  border-radius: 22px;
  box-shadow: 0 14px 34px rgba(8, 40, 68, 0.05);
}
.scene, .take, .note { padding: 18px 20px; margin: 18px 0; }
.scene strong, .take strong { color: var(--deep); }
.take {
  background:
    linear-gradient(90deg, #0e7eae, #49b4dc) left / 3px 100% no-repeat,
    linear-gradient(180deg, #fff, #eef7fc);
  padding-left: 22px;
}
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin: 22px 0; }
.flow div {
  background: rgba(255,255,255,0.86);
  border: 1px solid rgba(14,126,174,0.1);
  border-radius: 18px;
  padding: 14px;
  min-height: 128px;
  box-shadow: 0 10px 24px rgba(8,40,68,0.04);
  transition: transform 0.4s var(--ease);
}
.flow div:hover { transform: translateY(-4px); }
.flow b { display: block; color: var(--water); font-size: 12px; letter-spacing: 0.12em; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card { padding: 18px 18px 8px; transition: transform 0.4s var(--ease); }
.card:hover { transform: translateY(-4px); }
.card h3 { margin: 0 0 8px; font-size: 22px; }
table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255,255,255,0.86);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
th, td { text-align: left; padding: 13px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #e8f4fb; font-weight: 650; }

.organ-layout, .urine-layout { display: grid; grid-template-columns: 230px 1fr; gap: 16px; margin-top: 16px; }
.organ-list, .urine-list { display: grid; gap: 8px; align-content: start; }
.organ-list button, .urine-list button {
  text-align: left;
  border: 1px solid rgba(14,126,174,0.12);
  background: rgba(255,255,255,0.8);
  border-radius: 14px;
  padding: 11px 14px;
  cursor: pointer;
  transition: transform 0.3s var(--ease), background 0.3s, color 0.3s;
}
.organ-list button:hover, .urine-list button:hover { transform: translateX(4px); }
.organ-list button[aria-selected="true"], .urine-list button[aria-selected="true"] {
  background: linear-gradient(180deg, #127eab, #0b587c);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 10px 20px rgba(11, 88, 124, 0.25);
}
.organ-panel, .urine-panel { display: none; }
.organ-panel.is-on, .urine-panel.is-on { display: block; }
.organ-panel.swap, .urine-panel.swap { animation: panelIn 0.45s var(--ease); }
.swatch { width: 18px; height: 18px; border-radius: 50%; display: inline-block; margin-right: 8px; vertical-align: -3px; border: 1px solid rgba(0,0,0,0.08); }
.alert { color: var(--alert); }
.warn { color: var(--warn); }
.good { color: var(--good); }

.calc { padding: 22px; display: grid; gap: 12px; }
.calc label { display: grid; gap: 6px; font-size: 15px; }
.calc input[type="number"] {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(243,247,251,0.9);
}
.check { display: flex; gap: 8px; align-items: flex-start; }
.result { min-height: 1.2em; }
.days { display: grid; gap: 10px; }
.day { padding: 14px 16px; transition: transform 0.35s var(--ease); }
.day:hover { transform: translateX(4px); }
.day label { display: flex; gap: 10px; align-items: flex-start; background: transparent; border: 0; padding: 0; width: 100%; cursor: pointer; }
.progress-note { color: var(--muted); }

details.myth { padding: 2px 18px; margin: 10px 0; }
details.myth summary { cursor: pointer; padding: 14px 0; font-weight: 650; }
details.myth p { margin: 0 0 12px; }
details.myth[open] { box-shadow: 0 16px 36px rgba(14, 90, 130, 0.08); }
.qa b { color: var(--deep); }

.next {
  display: inline-flex;
  margin-top: 12px;
  text-decoration: none;
  font-weight: 700;
  transition: gap 0.3s var(--ease), transform 0.3s var(--ease);
}
.next:hover { transform: translateX(6px); }
.sources { padding: 48px 0 24px; }
.source-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.source-list li { padding: 14px 16px; font-size: 14px; }
footer.site {
  margin-top: 28px;
  background:
    radial-gradient(600px 180px at 20% 0%, rgba(73, 180, 220, 0.25), transparent 60%),
    var(--navy);
  color: #d7e8f2;
  padding: 36px 0 42px;
}
footer.site a { color: #fff; }

.rise {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.rise.in { opacity: 1; transform: none; }
.chapter-map li:nth-child(3n+2).rise { transition-delay: 0.08s; }
.chapter-map li:nth-child(3n).rise { transition-delay: 0.16s; }
.flow > div:nth-child(2).rise { transition-delay: 0.06s; }
.flow > div:nth-child(3).rise { transition-delay: 0.12s; }
.flow > div:nth-child(4).rise { transition-delay: 0.18s; }
.flow > div:nth-child(5).rise { transition-delay: 0.24s; }

@keyframes rise {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: none; }
}
@keyframes photoIn {
  from { opacity: 0; transform: translateY(18px) scale(0.98); }
  to { opacity: 1; transform: none; }
}
@keyframes drift {
  from { transform: scale(1) translateY(0); }
  to { transform: scale(1.07) translateY(-10px); }
}
@keyframes wave {
  50% { transform: translateX(12px); }
}
@keyframes sheen {
  0%, 55% { transform: translateX(-130%); }
  100% { transform: translateX(130%); }
}
@keyframes floaty {
  50% { transform: translate3d(24px, 18px, 0) scale(1.06); }
}
@keyframes drip {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(3px); }
}
@keyframes panelIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 980px) {
  html { -webkit-text-size-adjust: 100%; }
  .level { display: none; }
  .top-stack {
    position: sticky;
    top: 0;
    z-index: 30;
  }
  .top-stack header.site {
    position: static;
    gap: 10px;
    padding: 12px 16px;
    padding-top: max(12px, env(safe-area-inset-top));
  }
  .brand {
    flex: 1;
    min-width: 0;
    font-size: 16px;
    line-height: 1.35;
  }
  .nav-desk { display: none; }
  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    min-height: 44px;
    min-width: 64px;
  }
  .drawer {
    max-height: min(70vh, 520px);
    overflow: auto;
    padding: 4px 16px 14px;
    padding-bottom: max(14px, env(safe-area-inset-bottom));
    -webkit-overflow-scrolling: touch;
  }
  .drawer a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 12px;
    background: rgba(243, 247, 251, 0.85);
  }
  .hero-grid, .split, .two, .organ-layout, .urine-layout {
    grid-template-columns: 1fr;
  }
  .chapter-map ol, .cards { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .hero { padding-top: 28px; }
  .hero-photo, .hero-photo img { min-height: 240px; }
  .hero-photo { border-radius: 24px; }
  .hero-photo figcaption { max-width: calc(100% - 36px); }
  .wrap { width: min(1100px, calc(100% - 32px)); }
  .chapter { padding: 52px 0; }
  h1 { font-size: clamp(30px, 8vw, 44px); }
  .chapter h2 { font-size: clamp(26px, 6.4vw, 36px); }
  .kicker, .eyebrow { letter-spacing: 0.12em; }
  .organ-list, .urine-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 2px 2px 8px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
  }
  .organ-list button, .urine-list button {
    flex: 0 0 auto;
    min-height: 44px;
    white-space: nowrap;
    scroll-snap-align: start;
  }
  .flow div { min-height: 0; }
  .source-list li, figcaption, .lead, .sub { overflow-wrap: anywhere; }
  footer.site { padding-bottom: max(42px, env(safe-area-inset-bottom)); }
}
@media (max-width: 640px) {
  .wrap { width: min(1100px, calc(100% - 28px)); }
  .chapter-map ol, .cards, .flow { grid-template-columns: 1fr; }
  .chapter { padding: 40px 0; }
  .chapter-map { padding-bottom: 28px; }
  h1 { font-size: 30px; }
  .sub, .lead { font-size: 16px; }
  .card h3 { font-size: 20px; }
  .hero-photo, .hero-photo img { min-height: 210px; }
  .scene, .take, .note { padding: 16px; }
  details.myth { padding: 2px 14px; }
}
@media (hover: none) {
  .btn:hover, .chapter-map a:hover, .card:hover, .flow div:hover,
  .day:hover, .organ-list button:hover, .urine-list button:hover,
  figure:hover img, .next:hover { transform: none; }
}
@media (scripting: none) {
  .rise { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-grid > div > *, .hero-photo, .hero-photo img, .hero-photo::after,
  .btn.primary::after, .aurora span, .drop, .level-water::before, .level-water::after,
  .organ-panel.swap, .urine-panel.swap { animation: none; }
  .rise { opacity: 1; transform: none; }
  .btn:hover, .chapter-map a:hover, .card:hover, figure:hover img { transform: none; }
}