:root {
  --forest: #10251f;
  --forest-deep: #081510;
  --forest-soft: #1d3a30;
  --paper: #f4f0e7;
  --paper-bright: #fbf9f3;
  --ink: #18201d;
  --ink-soft: #5c625e;
  --red: #c84b35;
  --red-deep: #a83928;
  --gold: #d6ad69;
  --line: rgba(24, 32, 29, 0.15);
  --serif: "Songti SC", "STSong", "SimSun", Georgia, serif;
  --hand: "STKaiti", "KaiTi", "FangSong", "STFangsong", var(--serif);
  --sans: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color-scheme: light;
  font-family: var(--sans);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
}

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

button {
  font: inherit;
}

.cover {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  background: var(--forest-deep);
  color: white;
  isolation: isolate;
}

.cover-photo {
  position: absolute;
  inset: 0 0 0 46%;
  z-index: -3;
  background-image: url("assets/jinsong-portrait.jpg");
  background-position: 50% 40%;
  background-size: cover;
  filter: saturate(0.78) contrast(1.04);
  transform: scale(1.015);
}

.cover-shade {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(6, 17, 13, 1) 0%, rgba(8, 24, 18, 0.96) 38%, rgba(8, 24, 18, 0.35) 67%, rgba(8, 20, 15, 0.14) 100%),
    linear-gradient(0deg, rgba(5, 14, 11, 0.62) 0%, transparent 42%);
}

.cover::after {
  content: "";
  position: absolute;
  inset: 18px;
  z-index: -1;
  border: 1px solid rgba(229, 201, 152, 0.24);
  pointer-events: none;
}

.cover-content {
  width: min(720px, 58vw);
  min-height: 100svh;
  padding: clamp(54px, 8vh, 96px) clamp(34px, 7vw, 116px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.cover-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #dfc38f;
  font-size: 12px;
  letter-spacing: 0.22em;
}

.kicker-line {
  display: inline-block;
  width: 28px;
  height: 1px;
  background: currentColor;
}

.cover-copy {
  margin-block: auto;
}

.eyebrow {
  margin: 0 0 22px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.cover h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(46px, 5.4vw, 86px);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.cover h1 span,
.cover h1 strong {
  display: block;
}

.cover h1 span {
  margin-bottom: 15px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.6em;
  letter-spacing: 0.01em;
}

.cover h1 strong:last-child {
  color: #e7c789;
}

.cover-subtitle {
  max-width: 520px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-family: var(--serif);
  font-size: clamp(17px, 1.6vw, 23px);
  line-height: 1.7;
}

.open-letter {
  min-width: 210px;
  margin-top: 22px;
  padding: 7px 7px 7px 25px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: white;
  cursor: pointer;
  backdrop-filter: blur(14px);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.open-letter:hover,
.open-letter:focus-visible {
  transform: translateY(-2px);
  border-color: #e7c789;
  background: rgba(255, 255, 255, 0.14);
  outline: none;
}

.button-label {
  font-weight: 650;
  letter-spacing: 0.08em;
}

.button-arrow {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--red);
  font-size: 22px;
}

.cover-note {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.cover-signature {
  position: absolute;
  right: clamp(28px, 5vw, 74px);
  bottom: clamp(28px, 5vw, 66px);
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 238, 209, 0.7);
  color: #fff4de;
  font-family: var(--serif);
  font-size: 28px;
  transform: rotate(-5deg);
}

.letter {
  background: var(--paper);
}

.letter-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 68px;
  padding: 0 clamp(18px, 5vw, 70px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(10, 25, 20, 0.92);
  color: white;
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 0;
  background: transparent;
  color: white;
  cursor: pointer;
  font-weight: 700;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 238, 209, 0.45);
  color: #e7c789;
  font-family: var(--serif);
}

.nav-cta {
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--red);
  color: white;
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
}

.section-inner {
  width: min(1160px, calc(100% - 48px));
  margin-inline: auto;
}

.section-inner.narrow {
  width: min(790px, calc(100% - 48px));
}

.section-dark {
  background:
    radial-gradient(circle at 85% 20%, rgba(69, 116, 86, 0.19), transparent 28%),
    var(--forest-deep);
  color: rgba(255, 255, 255, 0.76);
}

.letter-hero {
  padding: clamp(76px, 10vw, 140px) 0;
}

.stage-label {
  margin: 0 0 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #e3c68e;
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.18em;
}

.stage-label span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  letter-spacing: 0;
}

.stage-label.ink {
  color: var(--red-deep);
}

.stage-label.light {
  color: #e7c789;
}

.letter h2 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.025em;
}

.letter-hero h2 {
  margin: 0 0 52px;
  color: white;
  font-size: clamp(38px, 5.2vw, 70px);
  line-height: 1.22;
}

.letter-hero h2 em {
  color: #e7c789;
  font-style: normal;
}

.letter-hero p {
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.95;
}

.hero-lead {
  color: white;
  font-family: var(--serif);
  font-size: clamp(25px, 3vw, 36px) !important;
}

.attention-bridge {
  margin: -24px 0 50px;
  padding-left: 20px;
  border-left: 2px solid var(--red);
  color: #e7c789;
  font-family: var(--serif);
  font-size: clamp(20px, 2.4vw, 28px) !important;
}

.friendship-opening {
  margin: 0 0 56px;
  padding: 24px 28px;
  border: 1px solid rgba(231, 199, 137, 0.28);
  background: rgba(231, 199, 137, 0.07);
}

.friendship-opening p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 16px !important;
  line-height: 1.9 !important;
}

.friendship-opening .friendship-kicker {
  margin-bottom: 9px;
  color: #e7c789;
  font-size: 11px !important;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.hero-scenes {
  margin: 30px 0;
  padding: 24px 30px;
  border-left: 2px solid var(--red);
  background: rgba(255, 255, 255, 0.05);
}

.hero-scenes p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
}

.impact-line {
  color: white;
}

.impact-line strong {
  color: #f08a75;
}

blockquote {
  position: relative;
  margin: 55px 0 0;
  padding: 32px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  color: #e7c789;
}

blockquote span {
  position: absolute;
  top: 19px;
  left: 0;
  font-family: Georgia, serif;
  font-size: 74px;
  line-height: 1;
  opacity: 0.35;
}

blockquote p {
  margin: 0 0 0 56px;
  font-family: var(--serif);
  font-size: clamp(28px, 3vw, 42px) !important;
}

.letter-section {
  padding: clamp(76px, 10vw, 132px) 0;
}

.story-section {
  background:
    linear-gradient(rgba(24, 32, 29, 0.045) 1px, transparent 1px),
    var(--paper-bright);
  background-size: 100% 38px;
}

.story-section .section-inner > p:not(.stage-label) {
  font-family: var(--serif);
  font-size: clamp(19px, 2vw, 24px);
  line-height: 2;
}

.portrait-note {
  margin: 18px 0 45px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.portrait-note img {
  width: 84px;
  height: 84px;
  border: 4px solid white;
  border-radius: 50%;
  object-fit: cover;
  object-position: 50% 35%;
  box-shadow: 0 12px 32px rgba(22, 43, 35, 0.14);
}

.portrait-note p {
  margin: 0;
}

.hand-note {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
}

.signature-text {
  margin-top: 5px !important;
  color: var(--ink-soft);
  font-size: 12px;
}

.spoken {
  margin: 42px 0;
  padding: 26px 30px;
  border: 1px solid rgba(200, 75, 53, 0.24);
  background: rgba(200, 75, 53, 0.055);
  color: var(--red-deep);
  font-weight: 700;
}

.truth-card {
  margin-top: 56px;
  padding: clamp(30px, 5vw, 60px);
  background: var(--forest);
  color: rgba(255, 255, 255, 0.72);
  box-shadow: 18px 18px 0 #e3d8c4;
}

.truth-card .truth-small {
  margin: 0 0 10px;
  color: #e3c68e;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.16em;
}

.truth-card h3 {
  margin: 0;
  color: white;
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.4;
}

.truth-card p:last-child {
  margin: 24px 0 0;
  font-size: 16px;
  line-height: 1.8;
}

.camp-section {
  background: var(--paper);
}

.drama-section {
  padding: clamp(70px, 9vw, 120px) 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 76% 25%, rgba(62, 123, 127, 0.24), transparent 31%),
    linear-gradient(135deg, #070b0b 0%, #101b19 100%);
  color: white;
}

.drama-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.78fr) 1.22fr;
  align-items: center;
  gap: clamp(46px, 8vw, 108px);
}

.drama-poster-wrap {
  position: relative;
}

.drama-poster-wrap::before {
  content: "";
  position: absolute;
  inset: -18px 18px 18px -18px;
  border: 1px solid rgba(231, 199, 137, 0.3);
  pointer-events: none;
}

.drama-poster-link {
  position: relative;
  display: block;
  background: #060808;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.48);
}

.drama-poster-link img {
  display: block;
  width: 100%;
  height: auto;
}

.drama-poster-link span {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 8px 11px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(5, 10, 9, 0.82);
  color: white;
  font-size: 10px;
  font-weight: 700;
  backdrop-filter: blur(10px);
}

.drama-copy h2 {
  margin: 0 0 22px;
  font-size: clamp(42px, 5vw, 70px);
  line-height: 1.16;
}

.drama-name {
  margin: 0 0 24px;
  color: #e7c789;
  font-family: var(--serif);
  font-size: 31px;
}

.drama-copy > p:not(.stage-label):not(.mini-kicker):not(.drama-name):not(.drama-return) {
  max-width: 630px;
  color: rgba(255, 255, 255, 0.65);
  font-size: 16px;
  line-height: 1.9;
}

.drama-copy ul {
  margin: 28px 0;
  padding: 0;
  display: grid;
  gap: 12px;
  list-style: none;
}

.drama-copy li {
  position: relative;
  padding-left: 24px;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.7;
}

.drama-copy li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 8px;
  height: 8px;
  border: 1px solid #e7c789;
  transform: rotate(45deg);
}

.drama-cta {
  width: fit-content;
  padding: 14px 20px;
  display: inline-flex;
  align-items: center;
  gap: 28px;
  border-radius: 999px;
  background: #e7c789;
  color: var(--forest-deep);
  font-size: 14px;
  font-weight: 850;
  text-decoration: none;
  transition: transform 180ms ease, background 180ms ease;
}

.drama-cta:hover,
.drama-cta:focus-visible {
  transform: translateY(-2px);
  background: #f4d79e;
  outline: none;
}

.drama-return {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.4);
  font-size: 11px;
}

.section-heading,
.arsenal-heading {
  margin-bottom: 54px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: end;
  gap: 80px;
}

.mini-kicker {
  margin: 0 0 12px;
  color: var(--red-deep);
  font-weight: 800;
  letter-spacing: 0.16em;
}

.section-heading h2,
.arsenal-heading h2 {
  margin: 0;
  font-size: clamp(39px, 4.8vw, 66px);
  line-height: 1.18;
}

.section-heading > p,
.arsenal-heading > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.9;
}

.five-days {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.five-days li {
  min-height: 365px;
  padding: 26px 22px 30px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
}

.five-days li:last-child {
  border-right: 0;
}

.day-number {
  color: var(--ink-soft);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.day-icon {
  width: 46px;
  height: 46px;
  margin: 32px 0;
  display: grid;
  place-items: center;
  border: 1px solid rgba(200, 75, 53, 0.36);
  border-radius: 50%;
  color: var(--red-deep);
  font-family: Georgia, serif;
  font-size: 14px;
}

.five-days h3 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 22px;
}

.five-days p {
  margin: 0 0 20px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.75;
}

.five-days strong {
  margin-top: auto;
  color: var(--red-deep);
  font-size: 12px;
}

.trust-strip {
  margin-top: 45px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.trust-strip div {
  padding: 20px 22px;
  border-left: 3px solid var(--red);
  background: var(--paper-bright);
}

.trust-strip span,
.trust-strip strong {
  display: block;
}

.trust-strip span {
  color: var(--ink-soft);
  font-size: 12px;
}

.trust-strip strong {
  margin-top: 4px;
  font-family: var(--serif);
  font-size: 20px;
}

.arsenal-section {
  background: var(--forest);
  color: white;
}

.light-text {
  color: #e7c789;
}

.arsenal-heading > p {
  color: rgba(255, 255, 255, 0.65);
}

.agent-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.agent-grid article {
  min-height: 220px;
  padding: 24px 20px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  transition: background 180ms ease;
}

.agent-grid article:nth-child(5n) {
  border-right: 0;
}

.agent-grid article:nth-child(n + 6) {
  border-bottom: 0;
}

.agent-grid article:hover {
  background: rgba(255, 255, 255, 0.06);
}

.agent-grid article > span {
  color: #e7c789;
  font-family: Georgia, serif;
  font-size: 12px;
}

.agent-grid h3 {
  margin: 45px 0 10px;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.45;
}

.agent-grid p {
  margin: 0;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  line-height: 1.7;
}

.mystery-agent {
  background: var(--red-deep);
}

.value-anchor {
  margin-top: 44px;
  padding: 36px 42px;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid rgba(231, 199, 137, 0.35);
  text-align: center;
}

.value-anchor > p {
  margin: 0 0 22px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.value-equation {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  font-family: var(--serif);
  font-size: clamp(20px, 2.5vw, 34px);
}

.value-equation .multiply,
.value-equation .equals {
  color: #e7c789;
}

.value-equation strong {
  color: #f0c46f;
  font-size: 1.65em;
}

.value-anchor small {
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.38);
}

.choice-section {
  background: var(--paper-bright);
  text-align: center;
}

.choice-kicker {
  color: var(--red-deep);
  font-weight: 750;
  letter-spacing: 0.06em;
}

.choice-section h2 {
  margin: 18px 0 32px;
  font-size: clamp(42px, 5.5vw, 72px);
  line-height: 1.2;
}

.choice-section .section-inner > p:not(.choice-kicker):not(.deadline-copy) {
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.9;
}

.price-card {
  margin: 54px 0 28px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  border: 1px solid var(--line);
  background: white;
  text-align: left;
  box-shadow: 0 25px 60px rgba(24, 32, 29, 0.1);
}

.price-card > div {
  padding: 34px;
  background: var(--red-deep);
  color: white;
}

.price-label {
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.14em;
}

.price-card p {
  margin: 12px 0 0;
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.price-card p span {
  margin-top: 12px;
  font-size: 24px;
}

.price-card p strong {
  font-family: Georgia, serif;
  font-size: 76px;
  line-height: 1;
}

.price-card ul {
  margin: 0;
  padding: 30px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  list-style: none;
}

.price-card li {
  position: relative;
  padding-left: 24px;
  color: var(--ink-soft);
}

.price-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--red-deep);
  font-weight: 900;
}

.deadline-copy {
  margin: 0;
  padding: 18px 22px;
  background: #f0e9dc;
  color: #6b554b;
  font-size: 13px;
  line-height: 1.7;
}

.enroll-section {
  padding: clamp(76px, 10vw, 130px) 0;
  background:
    radial-gradient(circle at 18% 15%, rgba(84, 132, 100, 0.24), transparent 29%),
    var(--forest-deep);
  color: white;
}

.enroll-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: clamp(48px, 8vw, 110px);
}

.enroll-copy h2 {
  margin: 0 0 26px;
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.2;
}

.enroll-copy > p:not(.stage-label) {
  color: rgba(255, 255, 255, 0.65);
  font-size: 17px;
  line-height: 1.9;
}

.final-choice {
  color: white !important;
  font-family: var(--serif);
  font-size: 21px !important;
}

.sign-off {
  margin-top: 48px;
  display: flex;
  align-items: center;
  gap: 16px;
  color: rgba(255, 255, 255, 0.5);
}

.sign-off strong {
  color: #e7c789;
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 500;
}

.qr-card {
  position: relative;
  padding: 38px;
  background: var(--paper-bright);
  color: var(--ink);
  text-align: center;
  box-shadow: 20px 20px 0 rgba(200, 75, 53, 0.78);
}

.qr-badge {
  position: absolute;
  top: -15px;
  right: 24px;
  padding: 9px 14px;
  border-radius: 999px;
  background: #e7c789;
  color: var(--forest-deep);
  font-size: 12px;
  font-weight: 850;
}

.qr-card h3 {
  margin: 4px 0 8px;
  font-family: var(--serif);
  font-size: 30px;
}

.qr-card > p {
  margin: 0 0 22px;
  color: var(--ink-soft);
  font-size: 13px;
}

.qr-frame {
  width: min(100%, 300px);
  margin: 0 auto;
  padding: 14px;
  border: 1px solid var(--line);
  background: white;
}

.qr-frame img {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: crisp-edges;
}

.qr-steps {
  margin: 20px 0 12px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
}

.qr-card small {
  color: #898d89;
  font-size: 10px;
}

.letter-footer {
  padding: 38px 24px 100px;
  background: #050d0a;
  color: rgba(255, 255, 255, 0.38);
  text-align: center;
}

.letter-footer p {
  margin: 5px auto;
  max-width: 760px;
  font-size: 11px;
  line-height: 1.6;
}

.letter-footer button {
  margin-top: 22px;
  border: 0;
  background: transparent;
  color: #e7c789;
  cursor: pointer;
}

.mobile-action {
  display: none;
}

.letter-reveal {
  animation: letterReveal 600ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes letterReveal {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 980px) {
  .cover-photo {
    inset: 0;
    background-position: 55% 37%;
  }

  .cover-shade {
    background:
      linear-gradient(90deg, rgba(6, 17, 13, 0.94) 0%, rgba(8, 24, 18, 0.75) 58%, rgba(8, 20, 15, 0.28) 100%),
      linear-gradient(0deg, rgba(5, 14, 11, 0.85) 0%, transparent 60%);
  }

  .cover-content {
    width: 78vw;
  }

  .five-days {
    grid-template-columns: repeat(2, 1fr);
  }

  .five-days li:nth-child(2n) {
    border-right: 0;
  }

  .five-days li {
    min-height: 310px;
    border-bottom: 1px solid var(--line);
  }

  .five-days li:last-child {
    grid-column: 1 / -1;
    min-height: 250px;
    border-bottom: 0;
  }

  .agent-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .agent-grid article,
  .agent-grid article:nth-child(5n),
  .agent-grid article:nth-child(n + 6) {
    border-right: 1px solid rgba(255, 255, 255, 0.14);
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .agent-grid article:nth-child(2n) {
    border-right: 0;
  }

  .agent-grid article:nth-child(n + 9) {
    border-bottom: 0;
  }
}

@media (max-width: 720px) {
  .cover::after {
    inset: 10px;
  }

  .cover-photo {
    inset: 0;
    background-position: 50% 30%;
  }

  .cover-shade {
    background:
      linear-gradient(0deg, rgba(5, 14, 11, 0.98) 0%, rgba(8, 24, 18, 0.83) 52%, rgba(8, 20, 15, 0.05) 100%),
      linear-gradient(90deg, rgba(5, 14, 11, 0.35), transparent);
  }

  .cover-content {
    width: 100%;
    min-height: 100svh;
    padding: 34px 28px 42px;
    justify-content: flex-end;
  }

  .cover-kicker {
    position: absolute;
    top: 34px;
    left: 28px;
  }

  .cover-copy {
    margin: 0 0 24px;
  }

  .eyebrow {
    margin-bottom: 14px;
    font-size: 10px;
  }

  .cover h1 {
    font-size: clamp(38px, 12vw, 58px);
  }

  .cover h1 span {
    font-size: 0.52em;
  }

  .cover-subtitle {
    margin-top: 18px;
    font-size: 16px;
    line-height: 1.6;
  }

  .cover-signature {
    display: none;
  }

  .open-letter {
    width: 100%;
    margin-top: 0;
  }

  .section-inner,
  .section-inner.narrow {
    width: min(100% - 36px, 790px);
  }

  .letter-nav {
    height: 58px;
    padding: 0 16px;
  }

  .brand {
    font-size: 13px;
  }

  .brand-mark {
    width: 28px;
    height: 28px;
  }

  .nav-cta {
    padding: 8px 13px;
    font-size: 12px;
  }

  .letter-hero {
    padding-top: 68px;
  }

  .letter-hero h2 {
    margin-bottom: 38px;
    font-size: 39px;
  }

  .attention-bridge {
    margin-top: -16px;
    margin-bottom: 38px;
  }

  .letter-hero p {
    font-size: 17px;
    line-height: 1.85;
  }

  .hero-scenes {
    padding: 18px 20px;
  }

  blockquote p {
    margin-left: 38px;
  }

  .portrait-note img {
    width: 66px;
    height: 66px;
  }

  .hand-note {
    font-size: 17px;
  }

  .truth-card {
    box-shadow: 8px 8px 0 #e3d8c4;
  }

  .section-heading,
  .arsenal-heading,
  .enroll-layout,
  .drama-layout {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .drama-poster-wrap {
    width: min(100%, 390px);
    margin: 0 auto 34px;
  }

  .five-days,
  .trust-strip,
  .agent-grid {
    grid-template-columns: 1fr;
  }

  .five-days li,
  .five-days li:nth-child(2n),
  .five-days li:last-child {
    grid-column: auto;
    min-height: 245px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .five-days li:last-child {
    border-bottom: 0;
  }

  .day-icon {
    margin: 22px 0;
  }

  .agent-grid article,
  .agent-grid article:nth-child(2n),
  .agent-grid article:nth-child(5n),
  .agent-grid article:nth-child(n + 6),
  .agent-grid article:nth-child(n + 9) {
    min-height: 185px;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .agent-grid article:last-child {
    border-bottom: 0;
  }

  .agent-grid h3 {
    margin-top: 32px;
  }

  .value-anchor {
    padding: 30px 18px;
  }

  .value-equation {
    gap: 9px;
  }

  .price-card {
    grid-template-columns: 1fr;
  }

  .price-card > div {
    text-align: center;
  }

  .price-card p {
    justify-content: center;
  }

  .qr-card {
    padding: 34px 22px;
    box-shadow: 8px 8px 0 rgba(200, 75, 53, 0.78);
  }

  .letter-footer {
    padding-bottom: 110px;
  }

  .mobile-action {
    position: fixed;
    right: 12px;
    bottom: 12px;
    left: 12px;
    z-index: 30;
    padding: 13px 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    background: rgba(16, 37, 31, 0.96);
    color: white;
    text-decoration: none;
    box-shadow: 0 12px 36px rgba(3, 10, 7, 0.35);
    backdrop-filter: blur(14px);
  }

  .mobile-action span,
  .mobile-action em {
    font-size: 12px;
    font-style: normal;
  }

  .mobile-action strong {
    color: #e7c789;
    font-size: 18px;
  }

  .mobile-action em {
    padding: 8px 11px;
    border-radius: 8px;
    background: var(--red);
    font-weight: 750;
  }
}

@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;
  }
}

/* Traditional correspondence treatment: the sales logic stays underneath,
   while the reader experiences a warm personal letter. */
.letter {
  --paper: #f4ead2;
  --paper-bright: #fbf4e3;
  --ink: #3b2e26;
  --ink-soft: #6f6256;
  --line: rgba(104, 81, 62, 0.16);
  background: #d8c5a3;
  color: var(--ink);
  font-family: var(--sans);
}

.letter :where(p, li) {
  font-family: var(--sans);
}

.letter :where(h2, h3) {
  font-family: var(--serif);
}

.letter-nav {
  border-bottom-color: rgba(116, 81, 52, 0.18);
  background: rgba(249, 241, 220, 0.94);
  color: var(--ink);
  box-shadow: 0 4px 18px rgba(77, 52, 31, 0.08);
}

.brand {
  color: var(--ink);
}

.brand-mark {
  border-color: rgba(159, 56, 39, 0.45);
  color: #9f3827;
  background: rgba(159, 56, 39, 0.04);
  font-family: var(--hand);
}

.letter-hero,
.story-section,
.camp-section,
.arsenal-section,
.choice-section,
.enroll-section {
  background-color: var(--paper-bright);
  background-image:
    linear-gradient(90deg, transparent 0, transparent max(24px, calc(50% - 560px)), rgba(167, 60, 43, 0.2) max(24px, calc(50% - 560px)), rgba(167, 60, 43, 0.2) calc(max(24px, calc(50% - 560px)) + 1px), transparent calc(max(24px, calc(50% - 560px)) + 1px)),
    radial-gradient(circle at 18% 12%, rgba(136, 101, 62, 0.04), transparent 30%),
    radial-gradient(circle at 82% 76%, rgba(136, 101, 62, 0.025), transparent 25%);
  color: var(--ink);
}

.section-inner.narrow {
  width: min(720px, calc(100% - 48px));
}

.letter-hero h2,
.arsenal-heading h2,
.enroll-copy h2 {
  color: var(--ink);
}

.letter-hero h2 em,
.light-text,
.arsenal-section .mini-kicker,
.enroll-section .stage-label,
.arsenal-section .stage-label {
  color: #a63d2b;
}

.letter-salutation {
  margin: 4px 0 24px;
  color: #8f3427;
  font-family: var(--hand) !important;
  font-size: clamp(22px, 2.2vw, 30px) !important;
  font-weight: 600;
}

.stage-label {
  min-height: 34px;
  margin-bottom: 18px;
  color: #9f3827;
}

.stage-label span {
  width: 36px;
  height: 36px;
  border-color: rgba(159, 56, 39, 0.65);
  background: rgba(159, 56, 39, 0.045);
  color: #9f3827;
  font-family: Georgia, serif;
  box-shadow: inset 0 0 0 3px rgba(159, 56, 39, 0.045);
}

.drama-section .stage-label span {
  border-color: rgba(231, 199, 137, 0.75);
  background: transparent;
  color: #e7c789;
  font-family: var(--hand);
  font-size: 10px;
}

.attention-bridge {
  border-left-color: #a63d2b;
  color: #8e3b2e;
  font-family: var(--sans);
  font-size: clamp(17px, 1.8vw, 21px) !important;
  line-height: 1.85;
}

.letter-hero > .section-inner > p,
.letter-hero p,
.hero-scenes p,
.friendship-opening p,
.enroll-copy > p:not(.stage-label) {
  color: var(--ink-soft);
}

.hero-lead,
.impact-line,
.final-choice {
  color: var(--ink) !important;
}

.friendship-opening {
  border-color: rgba(159, 56, 39, 0.22);
  background: rgba(159, 56, 39, 0.045);
}

.friendship-opening .friendship-kicker {
  color: #a63d2b;
}

.hero-scenes {
  border-left-color: #a63d2b;
  background: rgba(137, 91, 58, 0.045);
}

blockquote {
  border-top-color: rgba(104, 81, 62, 0.2);
  color: #a63d2b;
}

.story-section .section-inner > p:not(.stage-label),
.choice-section .section-inner > p:not(.choice-kicker):not(.deadline-copy) {
  font-family: var(--sans);
}

.letter-hero h2 {
  margin-bottom: 42px;
  font-size: clamp(38px, 4.4vw, 60px);
  line-height: 1.28;
}

.letter-hero p,
.story-section .section-inner > p:not(.stage-label) {
  font-size: clamp(16px, 1.55vw, 19px);
  line-height: 1.9;
}

.hero-lead {
  font-size: clamp(22px, 2.5vw, 30px) !important;
}

.friendship-opening {
  padding: 24px 26px;
  border-radius: 4px;
}

.friendship-opening p {
  font-size: 15px !important;
  line-height: 1.9 !important;
}

.hand-note,
.signature-text,
blockquote p,
.sign-off strong,
.letter-footer button {
  font-family: var(--hand) !important;
}

blockquote p {
  font-size: clamp(25px, 2.8vw, 36px) !important;
}

.truth-card {
  border: 1px solid rgba(136, 73, 48, 0.22);
  background: #f0e1c3;
  color: var(--ink-soft);
  box-shadow: 12px 12px 0 #d8c19a;
}

.truth-card .truth-small,
.truth-card h3 {
  color: #8e3b2e;
}

.section-heading > p,
.arsenal-heading > p,
.agent-grid p {
  color: var(--ink-soft);
}

.five-days,
.agent-grid {
  border-color: rgba(104, 81, 62, 0.2);
}

.agent-grid article,
.agent-grid article:nth-child(5n),
.agent-grid article:nth-child(n + 6) {
  border-color: rgba(104, 81, 62, 0.18);
}

.agent-grid article:hover {
  background: rgba(144, 88, 52, 0.05);
}

.agent-grid article > span,
.day-number,
.day-icon,
.five-days strong {
  color: #a63d2b;
}

.mystery-agent {
  background: #914030;
  color: white;
}

.mystery-agent h3,
.mystery-agent > span {
  color: white;
}

.mystery-agent p {
  color: rgba(255, 255, 255, 0.68);
}

.value-anchor {
  border-color: rgba(159, 56, 39, 0.3);
  background: rgba(255, 250, 237, 0.55);
}

.value-anchor > p,
.value-anchor small {
  color: var(--ink-soft);
}

.value-equation .multiply,
.value-equation .equals,
.value-equation strong {
  color: #a63d2b;
}

.choice-kicker {
  color: #a63d2b;
}

.price-card,
.qr-card {
  background: #fffaf0;
  box-shadow: 16px 16px 0 rgba(120, 80, 49, 0.16);
}

.enroll-section {
  padding-bottom: clamp(90px, 11vw, 145px);
}

.sign-off {
  color: var(--ink-soft);
}

.sign-off strong {
  color: #a63d2b;
  font-family: var(--hand);
}

.qr-card {
  border: 1px solid rgba(120, 80, 49, 0.18);
  color: var(--ink);
}

.letter-footer {
  border-top: 1px solid rgba(104, 81, 62, 0.18);
  background: #e8d8b9;
  color: rgba(59, 46, 38, 0.58);
}

.letter-footer button {
  color: #913c2d;
  font-family: var(--hand);
}

@media (max-width: 720px) {
  .letter-hero,
  .story-section,
  .camp-section,
  .arsenal-section,
  .choice-section,
  .enroll-section {
    background-image:
      linear-gradient(90deg, transparent 0, transparent 13px, rgba(167, 60, 43, 0.19) 13px, rgba(167, 60, 43, 0.19) 14px, transparent 14px),
      radial-gradient(circle at 18% 12%, rgba(136, 101, 62, 0.04), transparent 30%),
      radial-gradient(circle at 82% 76%, rgba(136, 101, 62, 0.025), transparent 25%);
  }

  .section-inner,
  .section-inner.narrow {
    width: min(100% - 40px, 720px);
  }

  .letter-hero {
    padding-top: 58px;
  }

  .letter-hero h2 {
    margin-bottom: 30px;
    font-size: 32px;
    line-height: 1.38;
    letter-spacing: -0.02em;
  }

  .letter-salutation {
    margin-bottom: 18px;
    font-size: 22px !important;
  }

  .attention-bridge {
    margin-top: -8px;
    margin-bottom: 30px;
    padding-left: 16px;
    font-size: 16px !important;
    line-height: 1.8;
  }

  .letter-hero p,
  .story-section .section-inner > p:not(.stage-label) {
    font-size: 16px;
    line-height: 1.85;
  }

  .hero-lead {
    font-size: 21px !important;
    line-height: 1.7 !important;
  }

  .friendship-opening {
    margin-bottom: 44px;
    padding: 20px;
  }

  .friendship-opening p {
    font-size: 15px !important;
    line-height: 1.85 !important;
  }

  .section-heading h2,
  .arsenal-heading h2,
  .drama-copy h2,
  .choice-section h2,
  .enroll-copy h2,
  .truth-card h3 {
    font-size: 32px;
    line-height: 1.35;
    letter-spacing: -0.02em;
  }

  .section-heading > p,
  .arsenal-heading > p,
  .drama-copy > p:not(.stage-label):not(.mini-kicker):not(.drama-name):not(.drama-return),
  .enroll-copy > p:not(.stage-label) {
    font-size: 15px;
    line-height: 1.85;
  }

  .qr-card h3 {
    font-size: 26px;
  }

  .truth-card {
    box-shadow: 7px 7px 0 #d8c19a;
  }

  .price-card,
  .qr-card {
    box-shadow: 7px 7px 0 rgba(120, 80, 49, 0.16);
  }
}

/* Lighter, more inviting cover for WeChat sharing. */
.cover {
  background: #f4ecdc;
  color: #26342e;
}

.cover-photo {
  inset: 0 0 0 50%;
  background-position: 50% 38%;
  filter: saturate(0.88) contrast(0.98) brightness(1.04);
}

.cover-shade {
  background:
    linear-gradient(90deg, #f8f1e3 0%, #f8f1e3 43%, rgba(248, 241, 227, 0.94) 49%, rgba(248, 241, 227, 0.08) 67%, transparent 100%),
    linear-gradient(0deg, rgba(18, 41, 32, 0.12), transparent 42%);
}

.cover::after {
  border-color: rgba(79, 93, 83, 0.22);
}

.cover-content {
  width: min(720px, 57vw);
}

.cover-kicker {
  color: #7d3c2f;
}

.eyebrow {
  color: #8b5b48;
  font-weight: 700;
}

.cover h1 {
  color: #26342e;
}

.cover h1 span {
  color: #637069;
}

.cover h1 strong:last-child {
  color: #b54b37;
}

.cover-subtitle {
  color: #58655f;
}

.open-letter {
  border-color: rgba(38, 52, 46, 0.24);
  background: rgba(255, 255, 255, 0.58);
  color: #26342e;
  box-shadow: 0 12px 34px rgba(77, 61, 41, 0.1);
  backdrop-filter: blur(12px);
}

.open-letter:hover,
.open-letter:focus-visible {
  border-color: #b54b37;
  background: rgba(255, 255, 255, 0.9);
}

.button-arrow {
  background: #bd4c37;
  color: white;
}

.cover-note {
  color: #7d847f;
}

.cover-signature {
  border-color: rgba(255, 246, 226, 0.88);
  background: rgba(255, 250, 239, 0.14);
  color: #fff8e8;
  backdrop-filter: blur(6px);
}

@media (max-width: 980px) {
  .cover-photo {
    inset: 0;
  }

  .cover-shade {
    background:
      linear-gradient(90deg, rgba(248, 241, 227, 0.97) 0%, rgba(248, 241, 227, 0.9) 49%, rgba(248, 241, 227, 0.12) 100%),
      linear-gradient(0deg, rgba(20, 42, 34, 0.15), transparent 50%);
  }
}

@media (max-width: 720px) {
  .cover {
    background: #f8f1e3;
  }

  .cover-photo {
    inset: 0 0 45% 0;
    background-position: 50% 29%;
    filter: saturate(0.9) contrast(0.98) brightness(1.06);
  }

  .cover-shade {
    background:
      linear-gradient(0deg, #f8f1e3 0%, #f8f1e3 45%, rgba(248, 241, 227, 0.96) 51%, rgba(248, 241, 227, 0.1) 67%, transparent 100%),
      linear-gradient(90deg, rgba(13, 36, 27, 0.16), transparent 75%);
  }

  .cover-content {
    width: 100%;
    padding: 32px 28px 36px;
  }

  .cover-kicker {
    color: #fff7e7;
    text-shadow: 0 1px 12px rgba(4, 22, 14, 0.5);
  }

  .cover-copy {
    margin-bottom: 18px;
  }

  .eyebrow {
    color: #9b5543;
  }

  .cover h1 {
    font-size: clamp(38px, 11.5vw, 54px);
    line-height: 1.05;
  }

  .cover h1 span {
    margin-bottom: 12px;
    color: #66736c;
    font-size: 0.42em;
  }

  .cover-subtitle {
    margin-top: 14px;
    color: #5e6a64;
    font-family: var(--sans);
    font-size: 14px;
    line-height: 1.7;
  }

  .open-letter {
    background: rgba(255, 255, 255, 0.78);
  }

  .cover-note {
    color: #818984;
  }
}