@charset "UTF-8";

:root {
  --paper: #fffaf5;
  --paper-deep: #fff4ed;
  --pink: #f4b8c9;
  --pink-soft: #fbe2e8;
  --pink-pale: #fff0f3;
  --rose: #b65f7b;
  --rose-deep: #b84e6e;
  --yellow: #f6d98b;
  --yellow-soft: #fff0bd;
  --ink: #493d3b;
  --muted: #8a7873;
  --line: rgba(136, 96, 91, 0.16);
  --font-serif: "JinzisheZhenhao", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-sans: "JinzisheZhenhao", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-latin: "JinzisheZhenhao", Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 4% 8%, rgba(246, 217, 139, 0.18), transparent 25rem),
    radial-gradient(circle at 96% 20%, rgba(244, 184, 201, 0.18), transparent 28rem),
    var(--paper);
  font-family: var(--font-serif);
  -webkit-font-smoothing: antialiased;
}

::selection {
  color: var(--ink);
  background: var(--yellow-soft);
}

:root {
  scrollbar-width: thin;
  scrollbar-color: var(--pink) transparent;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: var(--pink);
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--rose);
  background-clip: padding-box;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.sticker {
  display: inline-block;
  width: 1.4em;
  height: 1.4em;
  object-fit: contain;
  vertical-align: -0.3em;
  margin-left: 0.15em;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  color: inherit;
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--rose);
  outline-offset: 5px;
}

.reading-progress {
  position: absolute;
  z-index: 500;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--pink), var(--rose), var(--yellow));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 56px;
  padding: 0 clamp(24px, 4vw, 64px);
  border-bottom: 1px solid rgba(136, 96, 91, 0.08);
  background: rgba(255, 250, 245, 0.84);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--rose-deep);
}

.brand-mark {
  width: 36px;
  height: 36px;
}

.brand > span {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.18em;
}

.brand small {
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 0.16em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-note {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.2em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
}

.nav-toggle svg {
  width: 17px;
  height: 17px;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(380px, 0.95fr) minmax(380px, 0.85fr);
  align-items: center;
  gap: clamp(36px, 6vw, 96px);
  width: min(100%, 1440px);
  min-height: 100svh;
  margin: 0 auto;
  padding: 104px clamp(40px, 6vw, 96px) 94px;
  overflow: hidden;
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero-blob-one {
  top: 16%;
  left: -110px;
  width: 250px;
  height: 250px;
  border: 1px solid rgba(182, 95, 123, 0.12);
  box-shadow: 0 0 0 34px rgba(244, 184, 201, 0.035), 0 0 0 70px rgba(244, 184, 201, 0.025);
}

.hero-blob-two {
  right: -100px;
  bottom: 6%;
  width: 280px;
  height: 280px;
  background: rgba(246, 217, 139, 0.09);
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 590px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 30px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.26em;
}

.eyebrow > span {
  width: 30px;
  height: 1px;
  background: var(--rose);
}

.hero h1 {
  margin: 0;
  font-size: clamp(58px, 6.2vw, 88px);
  font-weight: 500;
  line-height: 1.28;
  letter-spacing: 0.055em;
}

.hero h1 em {
  position: relative;
  z-index: 1;
  color: var(--rose-deep);
  font-style: normal;
}

.hero h1 em::after {
  position: absolute;
  z-index: -1;
  right: -3px;
  bottom: 7px;
  left: -3px;
  height: 17px;
  border-radius: 50%;
  background: var(--yellow-soft);
  content: "";
  transform: rotate(-2deg);
}

.hero-intro {
  max-width: 430px;
  margin: 32px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 2.05;
  letter-spacing: 0.08em;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 40px;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 54px;
  padding: 0 25px;
  border-radius: 999px;
  color: #fff;
  background: var(--rose-deep);
  box-shadow: 0 12px 28px rgba(184, 78, 110, 0.17);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.1em;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.primary-button svg {
  width: 18px;
  height: 18px;
}

.primary-button:hover {
  background: #a5425f;
  box-shadow: 0 15px 32px rgba(184, 78, 110, 0.24);
  transform: translateY(-2px);
}

.hero-meta {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.hero-visual {
  position: relative;
  z-index: 2;
  width: min(100%, 540px);
  justify-self: end;
}

.visual-frame {
  position: relative;
  overflow: hidden;
  border: 8px solid rgba(255, 255, 255, 0.66);
  border-radius: 270px 270px 38px 38px;
  background: var(--pink-soft);
  box-shadow: 0 30px 70px rgba(119, 74, 77, 0.13);
}

.visual-frame::after {
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 250px 250px 28px 28px;
  content: "";
  pointer-events: none;
}

.visual-frame img {
  width: 100%;
  height: auto;
}

.visual-caption {
  position: absolute;
  bottom: 54px;
  left: -38px;
  display: flex;
  flex-direction: column;
  min-width: 188px;
  padding: 20px 25px;
  border: 1px solid rgba(182, 95, 123, 0.1);
  background: rgba(255, 250, 245, 0.94);
  box-shadow: 0 14px 35px rgba(119, 74, 77, 0.12);
  transform: rotate(-4deg);
}

.visual-caption > span {
  margin-bottom: 8px;
  color: var(--rose);
  font-family: var(--font-latin);
  font-size: 10px;
  letter-spacing: 0.18em;
}

.visual-caption strong {
  font-size: 21px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.visual-caption small {
  margin-top: 9px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 10px;
}

.round-stamp {
  position: absolute;
  top: 13%;
  right: -30px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 92px;
  height: 92px;
  border: 1px solid rgba(108, 82, 45, 0.25);
  border-radius: 50%;
  color: #7d633a;
  background: var(--yellow-soft);
  box-shadow: 0 8px 25px rgba(119, 74, 77, 0.08);
  font-family: var(--font-latin);
  font-size: 13px;
  line-height: 1.35;
  text-align: center;
  letter-spacing: 0.12em;
  transform: rotate(12deg);
}

.round-stamp::before {
  position: absolute;
  inset: 6px;
  border: 1px dashed rgba(108, 82, 45, 0.25);
  border-radius: inherit;
  content: "";
}

.round-stamp span {
  position: absolute;
  right: 13px;
  bottom: 12px;
  font-size: 10px;
}

.scroll-hint {
  position: absolute;
  bottom: 28px;
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 8px;
  letter-spacing: 0.2em;
  transform: translateX(-50%);
}

.scroll-hint i {
  position: relative;
  width: 1px;
  height: 28px;
  overflow: hidden;
  background: var(--line);
}

.scroll-hint i::after {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 12px;
  background: var(--rose);
  content: "";
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0% { transform: translateY(-12px); }
  70%, 100% { transform: translateY(30px); }
}

.letter-shell {
  display: grid;
  grid-template-columns: 210px minmax(0, 720px);
  align-items: start;
  gap: clamp(48px, 7vw, 96px);
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 84px 48px 80px;
  scroll-margin-top: 70px;
}

.toc {
  position: sticky;
  top: 88px;
}

.toc-inner {
  padding-top: 20px;
  border-top: 2px solid var(--rose);
}

.toc-label {
  margin: 0 0 8px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.2em;
}

.toc h2 {
  margin: 0 0 25px;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.toc-heading {
  display: block;
}

.toc-close {
  display: none;
}

.toc nav {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.toc nav a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.05em;
  transition: color 180ms ease, transform 180ms ease;
}

.toc nav a span {
  width: 20px;
  color: #b9a39c;
  font-family: var(--font-latin);
  font-size: 10px;
}

.toc nav a:hover,
.toc nav a.is-active {
  color: var(--rose-deep);
  transform: translateX(4px);
}

.toc nav a.is-active {
  font-weight: 600;
}

.toc nav a.is-active span {
  color: var(--rose);
}

.toc-progress {
  margin: 0 0 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.toc-progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 10px;
}

.toc-progress-label strong {
  color: var(--rose);
  font-family: var(--font-latin);
  font-size: 12px;
  font-weight: 400;
}

.toc-progress-track {
  height: 3px;
  margin-top: 11px;
  overflow: hidden;
  border-radius: 99px;
  background: var(--pink-soft);
}

.toc-progress-track span {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--rose), var(--pink), var(--yellow));
  transform: scaleX(0);
  transform-origin: left center;
}

.toc-progress p {
  margin: 12px 0 0;
  color: #a28f88;
  font-size: 10px;
  line-height: 1.8;
  letter-spacing: 0.04em;
}

.letter {
  min-width: 0;
}

.letter-intro {
  position: relative;
  padding-bottom: 28px;
}

.sample-tag {
  position: absolute;
  top: 0;
  right: 0;
  padding: 6px 10px;
  border: 1px solid rgba(182, 95, 123, 0.13);
  border-radius: 99px;
  color: var(--rose);
  background: var(--pink-pale);
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.letter-kicker {
  margin: 0 0 15px !important;
  color: var(--rose) !important;
  font-family: var(--font-sans);
  font-size: 10px !important;
  letter-spacing: 0.24em !important;
}

.letter-intro h2 {
  margin: 0 0 32px;
  font-size: 36px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.letter p {
  margin: 0 0 1.55em;
  font-size: 18px;
  line-height: 2.15;
  letter-spacing: 0.045em;
}

.letter .opening-line {
  font-size: 21px;
}

.letter .sample-note {
  margin-top: 34px;
  padding: 16px 20px;
  border-left: 2px solid var(--pink);
  border-radius: 0 12px 12px 0;
  color: var(--muted);
  background: var(--pink-pale);
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.04em;
}

.letter-rule {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 60px;
  color: var(--pink);
  font-size: 14px;
}

.letter-rule span {
  width: 54px;
  height: 1px;
  background: var(--line);
}

.chapter {
  padding: 64px 0 76px;
  scroll-margin-top: 70px;
}

.chapter + .chapter {
  border-top: 1px solid var(--line);
}

.chapter-heading {
  margin-bottom: 38px;
}

.chapter-number {
  display: block;
  margin-bottom: 15px;
  color: var(--rose);
  font-family: var(--font-latin);
  font-size: 11px;
  letter-spacing: 0.2em;
}

.chapter h2 {
  margin: 0;
  font-size: clamp(30px, 3.1vw, 40px);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0.055em;
}

.chapter p:last-child {
  margin-bottom: 0;
}

blockquote {
  position: relative;
  margin: 44px -20px;
  padding: 34px 40px 32px;
  border-radius: 4px 30px 4px 30px;
  background: linear-gradient(115deg, var(--pink-pale), #fff8e7);
}

blockquote > span {
  position: absolute;
  top: 5px;
  left: 17px;
  color: var(--pink);
  font-family: var(--font-latin);
  font-size: 56px;
  line-height: 1;
  opacity: 0.65;
}

.letter blockquote p {
  position: relative;
  margin: 0;
  color: #76505b;
  font-size: 20px;
  line-height: 1.95;
}

.chapter-illustration {
  margin: 18px -54px 36px;
}

.chapter-illustration img {
  width: 100%;
  height: auto;
  border-radius: 220px 220px 22px 22px;
  box-shadow: 0 18px 45px rgba(119, 74, 77, 0.09);
}

.chapter-illustration figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 17px 5px 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: 0.06em;
}

.chapter-illustration figcaption span {
  flex-shrink: 0;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 8px;
  letter-spacing: 0.16em;
}

.screenshot-figure {
  margin: 0 auto 40px;
  text-align: center;
}

.screenshot-figure:last-child {
  margin-bottom: 0;
}

.screenshot-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 14px 34px rgba(119, 74, 77, 0.08);
}

.screenshot-figure--small img {
  max-width: 260px;
  max-height: 58vh;
  width: auto;
}

.screenshot-figure figcaption {
  display: table;
  margin: 16px auto 0;
  padding: 7px 18px;
  border: 2px dashed var(--pink);
  border-radius: 999px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
  letter-spacing: 0.04em;
}

.screenshot-duo {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 32px;
  margin-bottom: 40px;
}

.screenshot-duo .screenshot-figure {
  margin-bottom: 0;
}

.screenshot-figure--stack img {
  display: inline-block;
  width: auto;
  max-width: 180px;
  max-height: 32vh;
  margin: 0 8px;
  vertical-align: top;
}

.screenshot-figure--grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.screenshot-figure--grid img {
  width: 100%;
}

.screenshot-figure--grid figcaption {
  grid-column: 1 / -1;
  justify-self: center;
}

.wish-card {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 40px 0;
  padding: 28px 32px;
  border-radius: 22px 4px 22px 4px;
  color: #79603a;
  background: linear-gradient(110deg, #fff0bd, #fff7dd);
}

.wish-card svg {
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  color: #b28a42;
}

.letter .wish-card p {
  margin: 0;
  font-size: 16px;
  line-height: 2;
}

.ending {
  position: relative;
  width: min(calc(100% - 64px), 1080px);
  margin: 60px auto 100px;
  padding: 88px 40px 76px;
  overflow: hidden;
  border-radius: 330px 330px 30px 30px;
  background:
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.7), transparent 42%),
    linear-gradient(130deg, #fbe2e8, #fff0c7);
  text-align: center;
}

.ending::before {
  position: absolute;
  inset: 16px;
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: 310px 310px 22px 22px;
  content: "";
  pointer-events: none;
}

.ending-icon {
  position: relative;
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  color: var(--rose);
}

.ending-kicker {
  position: relative;
  margin: 0 0 22px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.24em;
}

.ending h2 {
  position: relative;
  margin: 0;
  font-size: clamp(30px, 3.4vw, 44px);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: 0.07em;
}

.ending-note {
  position: relative;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.signature {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 44px;
}

.signature > span {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.signature strong {
  margin-top: 10px;
  padding: 0 18px 8px;
  border-bottom: 1px solid rgba(182, 95, 123, 0.3);
  color: var(--rose-deep);
  font-size: 27px;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.signature small {
  margin-top: 12px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 10px;
}

.back-to-top {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 42px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(184, 78, 110, 0.35);
  color: var(--rose-deep);
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.back-to-top:hover {
  border-color: var(--rose-deep);
}

.ending-flower {
  position: absolute;
  color: rgba(255, 255, 255, 0.52);
  font-size: 150px;
  line-height: 1;
}

.ending-flower-left {
  bottom: 10%;
  left: 9%;
  transform: rotate(15deg);
}

.ending-flower-right {
  top: 25%;
  right: 10%;
  font-size: 90px;
  transform: rotate(-15deg);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 clamp(24px, 4vw, 64px);
  padding: 28px 0 38px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 10px;
}

.site-footer p {
  margin: 0;
  font-size: 8px;
  letter-spacing: 0.18em;
  text-align: center;
}

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .hero {
    grid-template-columns: minmax(330px, 0.9fr) minmax(340px, 0.8fr);
    gap: 40px;
    padding-right: 50px;
    padding-left: 50px;
  }

  .hero h1 {
    font-size: clamp(54px, 6.5vw, 72px);
  }

  .visual-caption {
    left: -16px;
  }

  .round-stamp {
    right: -14px;
  }

  .letter-shell {
    grid-template-columns: 185px minmax(0, 1fr);
    gap: 52px;
  }

  .chapter-illustration {
    margin-right: 0;
    margin-left: 0;
  }
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: 72px;
  }

  .site-header {
    height: 56px;
    padding: 0 24px;
  }

  .header-note {
    display: none;
  }

  .js .nav-toggle {
    display: inline-flex;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 52px;
    min-height: auto;
    padding: 104px 32px 82px;
    text-align: center;
  }

  .hero-copy {
    margin: 0 auto;
  }

  .eyebrow,
  .hero-actions {
    justify-content: center;
  }

  .hero h1 {
    font-size: clamp(58px, 10vw, 80px);
  }

  .hero-intro {
    margin-right: auto;
    margin-left: auto;
  }

  .hero-visual {
    width: min(78vw, 520px);
    margin: 0 auto;
    justify-self: center;
  }

  .scroll-hint {
    display: none;
  }

  .letter-shell {
    grid-template-columns: minmax(0, 720px);
    justify-content: center;
    width: 100%;
    padding: 60px 36px 60px;
  }

  .toc-inner {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255, 250, 245, 0.98);
  }

  .toc-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
  }

  .toc h2 {
    margin-bottom: 16px;
  }

  .js .toc {
    position: fixed;
    z-index: 200;
    top: 68px;
    left: 50%;
    width: min(calc(100% - 32px), 420px);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
  }

  .js .toc.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }

  .js .toc-inner {
    box-shadow: 0 20px 70px rgba(91, 55, 61, 0.18);
  }

  .js .toc-close {
    display: block;
    width: 32px;
    height: 32px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    color: var(--muted);
    background: var(--pink-pale);
    font-family: var(--font-sans);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
  }

  .toc nav a {
    padding: 9px 0;
  }

  .toc-progress {
    margin-top: 18px;
    padding-top: 16px;
  }

  .chapter {
    scroll-margin-top: 45px;
  }

  .ending {
    width: calc(100% - 48px);
    margin-top: 40px;
    margin-bottom: 70px;
  }

  .site-footer {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 560px) {
  .site-header {
    height: 56px;
    padding: 0 18px;
  }

  .brand {
    gap: 6px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .brand > span {
    font-size: 15px;
  }

  .brand small {
    font-size: 7px;
  }

  .nav-toggle {
    padding: 8px 11px;
  }

  .nav-toggle span {
    font-size: 11px;
  }

  .hero {
    gap: 42px;
    padding: 96px 22px 64px;
  }

  .eyebrow {
    margin-bottom: 24px;
    font-size: 8px;
    letter-spacing: 0.2em;
  }

  .hero h1 {
    font-size: clamp(46px, 14vw, 66px);
    line-height: 1.32;
  }

  .hero h1 em::after {
    bottom: 4px;
    height: 13px;
  }

  .hero-intro {
    margin-top: 26px;
    font-size: 14px;
    line-height: 2;
  }

  .hero-actions {
    flex-direction: column;
    gap: 18px;
    margin-top: 32px;
  }

  .primary-button {
    min-height: 50px;
    padding: 0 23px;
    font-size: 13px;
  }

  .hero-visual {
    width: min(90vw, 430px);
  }

  .visual-frame {
    border-width: 5px;
    border-radius: 220px 220px 26px 26px;
  }

  .visual-frame::after {
    inset: 8px;
    border-radius: 210px 210px 20px 20px;
  }

  .visual-caption {
    bottom: 26px;
    left: -4px;
    min-width: 150px;
    padding: 14px 18px;
  }

  .visual-caption > span {
    margin-bottom: 5px;
    font-size: 8px;
  }

  .visual-caption strong {
    font-size: 17px;
  }

  .visual-caption small {
    margin-top: 6px;
    font-size: 8px;
  }

  .round-stamp {
    top: 12%;
    right: -6px;
    width: 68px;
    height: 68px;
    font-size: 10px;
  }

  .round-stamp span {
    right: 9px;
    bottom: 8px;
    font-size: 8px;
  }

  .letter-shell {
    padding: 52px 22px 40px;
  }

  .sample-tag {
    position: static;
    display: inline-block;
    margin-bottom: 24px;
  }

  .letter-intro h2 {
    margin-bottom: 26px;
    font-size: 30px;
  }

  .letter p {
    font-size: 17px;
    line-height: 2.05;
  }

  .letter .opening-line {
    font-size: 19px;
  }

  .letter .sample-note {
    padding: 14px 16px;
    font-size: 11px;
  }

  .letter-rule {
    margin-top: 46px;
  }

  .chapter {
    padding: 50px 0 58px;
  }

  .chapter-heading {
    margin-bottom: 30px;
  }

  .chapter h2 {
    font-size: 28px;
    line-height: 1.6;
  }

  blockquote {
    margin: 36px 0;
    padding: 30px 25px 26px;
    border-radius: 4px 24px 4px 24px;
  }

  .letter blockquote p {
    font-size: 18px;
  }

  .chapter-illustration {
    margin: 16px 0 30px;
  }

  .chapter-illustration img {
    border-radius: 130px 130px 16px 16px;
  }

  .chapter-illustration figcaption {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
    margin-top: 14px;
    font-size: 10px;
  }

  .wish-card {
    align-items: flex-start;
    gap: 15px;
    margin: 34px 0;
    padding: 23px 20px;
  }

  .wish-card svg {
    flex-basis: 28px;
    width: 28px;
    height: 28px;
    margin-top: 4px;
  }

  .letter .wish-card p {
    font-size: 14px;
  }

  .ending {
    width: calc(100% - 32px);
    margin: 28px auto 56px;
    padding: 70px 24px 58px;
    border-radius: 170px 170px 24px 24px;
  }

  .ending::before {
    inset: 10px;
    border-radius: 160px 160px 18px 18px;
  }

  .ending h2 {
    font-size: 28px;
    line-height: 1.75;
  }

  .ending-note {
    font-size: 11px;
    line-height: 1.8;
  }

  .signature strong {
    font-size: 24px;
  }

  .signature small {
    font-size: 9px;
  }

  .ending-flower {
    font-size: 90px;
  }

  .ending-flower-left {
    left: 4%;
  }

  .ending-flower-right {
    right: 4%;
    font-size: 64px;
  }

  .site-footer {
    margin: 0 20px;
    padding-bottom: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

.bgm-toggle {
  position: fixed;
  z-index: 300;
  right: 22px;
  bottom: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--rose-deep);
  background: rgba(255, 250, 245, 0.92);
  box-shadow: 0 10px 24px rgba(184, 78, 110, 0.14);
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.bgm-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(184, 78, 110, 0.2);
}

.bgm-toggle svg {
  width: 20px;
  height: 20px;
}

.bgm-toggle .icon-on {
  display: none;
}

.bgm-toggle.is-playing .icon-on {
  display: block;
}

.bgm-toggle.is-playing .icon-off {
  display: none;
}

.bgm-toggle.is-playing {
  animation: bgm-pulse 2.4s ease-in-out infinite;
}

@keyframes bgm-pulse {
  0%, 100% { box-shadow: 0 10px 24px rgba(184, 78, 110, 0.14); }
  50% { box-shadow: 0 10px 24px rgba(184, 78, 110, 0.14), 0 0 0 9px rgba(244, 184, 201, 0.16); }
}

.music-prompt {
  position: fixed;
  z-index: 400;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(255, 250, 245, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 1;
  transition: opacity 320ms ease;
}

.js .music-prompt {
  display: flex;
}

.music-prompt.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.music-prompt-card {
  width: min(100%, 430px);
  padding: 46px 38px 40px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: #fff;
  box-shadow: 0 30px 80px rgba(119, 74, 77, 0.18);
  text-align: center;
  animation: prompt-in 520ms cubic-bezier(0.2, 0.9, 0.3, 1.15) both;
}

@keyframes prompt-in {
  from { opacity: 0; transform: translateY(16px) scale(0.96); }
  to { opacity: 1; transform: none; }
}

.music-prompt-kicker {
  margin: 0 0 15px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.24em;
}

.music-prompt-card h2 {
  margin: 0;
  font-size: 25px;
  font-weight: 500;
  line-height: 1.75;
  letter-spacing: 0.06em;
}

.music-prompt-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.04em;
}

.music-prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-top: 30px;
}

.music-prompt-yes {
  padding: 13px 28px;
  border: 0;
  border-radius: 999px;
  color: #fff;
  background: var(--rose-deep);
  box-shadow: 0 12px 26px rgba(184, 78, 110, 0.2);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.music-prompt-yes:hover {
  background: #a5425f;
  box-shadow: 0 15px 30px rgba(184, 78, 110, 0.26);
  transform: translateY(-2px);
}

.music-prompt-no {
  padding: 13px 24px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease;
}

.music-prompt-no:hover {
  color: var(--rose-deep);
  border-color: var(--rose);
}

@media print {
  .site-header,
  .reading-progress,
  .scroll-hint,
  .toc,
  .back-to-top,
  .bgm-toggle,
  .music-prompt,
  .site-footer {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .hero {
    min-height: auto;
    padding-top: 40px;
  }

  .letter-shell {
    display: block;
    padding-top: 40px;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* 段落之间的小标签：折叠碎碎念 */
.side-note {
  margin: 1.8em auto;
  max-width: 30em;
  border: 1px dashed var(--pink);
  border-radius: 14px;
  background: var(--pink-pale);
}

.side-note summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.65em 1.2em;
  cursor: pointer;
  list-style: none;
  font-size: 0.88em;
  letter-spacing: 0.12em;
  color: var(--rose);
  user-select: none;
  transition: background 0.25s ease;
}

.side-note summary::-webkit-details-marker {
  display: none;
}

.side-note-hint {
  font-size: 0.82em;
  letter-spacing: 0.05em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.1em 0.7em;
  background: rgba(255, 255, 255, 0.6);
}

.side-note[open] .side-note-hint {
  display: none;
}

.side-note summary:hover {
  background: var(--pink-soft);
}

.side-note summary::after {
  content: "+";
  font-family: var(--font-latin);
  font-size: 1.1em;
  line-height: 1;
  transition: transform 0.25s ease;
}

.side-note[open] summary::after {
  transform: rotate(45deg);
}

.side-note p {
  margin: 0;
  padding: 1em 1.5em 1.3em;
  border-top: 1px dashed var(--pink);
  font-size: 0.92em;
  color: var(--muted);
}

/* 悄悄话：点击按钮弹出的小弹窗 */
.secret-btn {
  display: inline-block;
  margin-left: 0.6em;
  padding: 0.12em 0.9em;
  border: 1px solid var(--pink);
  border-radius: 999px;
  background: var(--pink-pale);
  color: var(--rose);
  font-size: 0.8em;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease;
}

.secret-btn:hover {
  background: var(--pink);
  color: #fff;
}

.secret-dialog {
  max-width: min(30em, 86vw);
  padding: 2.2em 2.2em 2em;
  border: 1px dashed var(--pink);
  border-radius: 16px;
  background: var(--pink-pale);
  color: var(--ink);
  font-family: inherit;
  font-size: 16px;
  line-height: 2.1;
  letter-spacing: 0.045em;
  box-shadow: 0 18px 50px rgba(184, 78, 110, 0.22);
}

.secret-dialog::backdrop {
  background: rgba(73, 61, 59, 0.28);
}

.secret-dialog[open] {
  position: fixed;
  inset: 0;
  width: fit-content;
  height: fit-content;
  margin: auto;
  animation: secret-pop 0.35s ease both;
}

.secret-dialog p {
  margin: 0;
}

.secret-sticker {
  display: block;
  width: 72px;
  height: auto;
  margin: 1em auto 0;
}

.secret-dialog-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 30px;
  height: 30px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--rose);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.25s ease;
}

.secret-dialog-close:hover {
  background: var(--pink-soft);
}

@keyframes secret-pop {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 第七章：证据弹窗与图片放大 */
.evidence {
  margin: 44px 0 8px;
  text-align: center;
}

.evidence-btn {
  display: inline-flex;
  align-items: center;
  padding: 13px 30px;
  border: 1px solid var(--pink);
  border-radius: 999px;
  background: var(--pink-pale);
  color: var(--rose-deep);
  font-size: 14px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.evidence-btn:hover {
  background: var(--rose-deep);
  color: #fff;
  transform: translateY(-2px);
}

.evidence-dialog {
  width: min(880px, 92vw);
  max-height: 86vh;
  padding: 32px 34px 30px;
  overflow-y: auto;
  border: 1px solid var(--pink);
  border-radius: 22px;
  background: var(--paper);
  color: var(--ink);
  font-family: inherit;
  box-shadow: 0 24px 60px rgba(184, 78, 110, 0.22);
}

.evidence-dialog::backdrop {
  background: rgba(73, 61, 59, 0.32);
}

.evidence-dialog[open] {
  position: fixed;
  inset: 0;
  height: fit-content;
  margin: auto;
  animation: secret-pop 0.35s ease both;
}

.evidence-kicker {
  margin: 0 0 26px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.24em;
  text-align: center;
}

.screenshot-figure img {
  cursor: zoom-in;
}

.zoom-dialog {
  padding: 0;
  border: none;
  background: transparent;
}

.zoom-dialog::backdrop {
  background: rgba(30, 20, 22, 0.72);
}

.zoom-dialog[open] {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  inset: 0;
  width: 100%;
  max-width: 100%;
  height: 100%;
  max-height: 100%;
  margin: 0;
  cursor: zoom-out;
}

.zoom-dialog img {
  max-width: 92vw;
  max-height: 90vh;
  border-radius: 10px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

/* 读完全文后的幸运转盘抽奖 */
.lottery-dialog {
  width: min(420px, 92vw);
  max-height: calc(100vh - 40px);
  padding: 40px 34px 36px;
  overflow: hidden;
  border: 1px solid var(--pink);
  border-radius: 26px;
  background: var(--paper);
  color: var(--ink);
  font-family: inherit;
  text-align: center;
  box-shadow: 0 24px 60px rgba(184, 78, 110, 0.22);
}

.lottery-dialog::backdrop {
  background: rgba(73, 61, 59, 0.32);
}

.lottery-dialog[open] {
  position: fixed;
  inset: 0;
  height: fit-content;
  margin: auto;
  animation: secret-pop 0.35s ease both;
}

.lottery-kicker {
  margin: 0 0 14px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.24em;
}

.lottery-dialog h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 500;
  line-height: 1.75;
  letter-spacing: 0.06em;
}

.lottery-wheel-wrap {
  position: relative;
  width: 250px;
  height: 250px;
  margin: 26px auto 0;
}

.lottery-pointer {
  position: absolute;
  z-index: 2;
  top: -7px;
  left: 50%;
  width: 0;
  height: 0;
  border-right: 11px solid transparent;
  border-left: 11px solid transparent;
  border-top: 20px solid var(--rose-deep);
  transform: translateX(-50%);
  filter: drop-shadow(0 3px 4px rgba(119, 74, 77, 0.25));
}

.lottery-wheel {
  position: absolute;
  inset: 0;
  border: 6px solid #fff;
  border-radius: 50%;
  background: conic-gradient(
    var(--pink-soft) 0deg 60deg,
    var(--yellow-soft) 60deg 120deg,
    var(--pink-soft) 120deg 180deg,
    var(--yellow-soft) 180deg 240deg,
    var(--pink-soft) 240deg 300deg,
    var(--yellow-soft) 300deg 360deg
  );
  box-shadow: 0 14px 34px rgba(119, 74, 77, 0.14), inset 0 0 0 1px var(--line);
  transition: transform 4.2s cubic-bezier(0.15, 0.9, 0.25, 1);
  will-change: transform;
}

.lottery-slice {
  position: absolute;
  top: 50%;
  left: 50%;
  color: var(--rose);
  font-family: var(--font-latin);
  font-size: 22px;
  transform: translate(-50%, -50%) rotate(calc(var(--i) * 60deg + 30deg)) translateY(-82px);
}

.lottery-spin {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  width: 76px;
  height: 76px;
  border: 4px solid #fff;
  border-radius: 50%;
  color: #fff;
  background: var(--rose-deep);
  box-shadow: 0 8px 20px rgba(184, 78, 110, 0.3);
  font-size: 17px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition: background 180ms ease;
}

.lottery-spin:hover:not(:disabled) {
  background: #a5425f;
}

.lottery-spin:disabled {
  cursor: default;
  opacity: 0.75;
}

.lottery-count {
  margin: 20px 0 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.lottery-prize {
  margin: 22px auto 0;
  padding: 14px 22px 16px;
  border: 2px dashed var(--pink);
  border-radius: 12px;
  background: #fff;
  visibility: hidden;
  opacity: 0;
  transform: rotate(-1.5deg) translateY(8px);
  transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s;
}

.lottery-prize.is-visible {
  visibility: visible;
  opacity: 1;
  transform: rotate(-1.5deg);
}

.lottery-prize-label {
  margin: 0 0 6px;
  color: var(--rose);
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.24em;
}

.lottery-prize-text {
  margin: 0;
  min-height: 1.6em;
  color: var(--rose-deep);
  font-size: 24px;
  line-height: 1.6;
  letter-spacing: 0.12em;
}

@media (max-width: 560px) {
  .lottery-dialog {
    padding: 34px 22px 30px;
  }

  .lottery-wheel-wrap {
    width: 220px;
    height: 220px;
  }

  .lottery-slice {
    font-size: 19px;
    transform: translate(-50%, -50%) rotate(calc(var(--i) * 60deg + 30deg)) translateY(-72px);
  }
}

/* 窗口太矮时压缩内容，保证奖品区也完整露出来 */
@media (max-height: 680px) {
  .lottery-dialog {
    padding: 26px 26px 24px;
  }

  .lottery-dialog h2 {
    font-size: 20px;
  }

  .lottery-wheel-wrap {
    width: 190px;
    height: 190px;
    margin-top: 18px;
  }

  .lottery-slice {
    font-size: 16px;
    transform: translate(-50%, -50%) rotate(calc(var(--i) * 60deg + 30deg)) translateY(-62px);
  }

  .lottery-spin {
    width: 62px;
    height: 62px;
    font-size: 14px;
  }

  .lottery-count {
    margin-top: 14px;
  }

  .lottery-prize {
    margin-top: 14px;
    padding: 10px 18px 12px;
  }

  .lottery-prize-text {
    font-size: 20px;
  }
}

@media print {
  .lottery-dialog {
    display: none !important;
  }
}