:root {
  --cream: #fff7eb;
  --paper: #ffffff;
  --ink: #22312e;
  --soft-ink: #42524e;
  --muted: #6b7772;
  --line: #eadcc7;
  --teal: #2d8a7c;
  --teal-dark: #1f665e;
  --coral: #e77f64;
  --gold: #eebb5f;
  --sage: #dcebdd;
  --mint: #eef8ef;
  --peach: #fff0e7;
  --shadow-soft: 0 16px 48px rgba(72, 56, 32, 0.1);
  --shadow-card: 0 10px 34px rgba(72, 56, 32, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background:
    linear-gradient(120deg, rgba(255, 240, 218, 0.96), rgba(243, 250, 241, 0.9) 44%, rgba(255, 250, 242, 0.98)),
    var(--cream);
  line-height: 1.65;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 10% 8%, rgba(238, 187, 95, 0.24), transparent 22rem),
    radial-gradient(circle at 88% 18%, rgba(45, 138, 124, 0.13), transparent 24rem);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.1rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 0.9rem 0;
  backdrop-filter: blur(18px);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 -1rem;
  z-index: -1;
  border-bottom: 1px solid rgba(234, 220, 199, 0.6);
  background: rgba(255, 248, 237, 0.78);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  color: var(--teal-dark);
  font-weight: 800;
}

.brand span {
  font-size: 1.06rem;
}

.brand small {
  color: var(--coral);
  font-size: 0.82rem;
  font-weight: 800;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: clamp(0.65rem, 2vw, 1.25rem);
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.nav-links a {
  padding: 0.35rem 0.1rem;
}

.nav-links a:hover {
  color: var(--teal-dark);
}

.language-switch {
  display: flex;
  gap: 0.32rem;
  padding: 0.25rem;
  border: 1px solid rgba(45, 138, 124, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 8px 22px rgba(72, 56, 32, 0.06);
}

.lang-button {
  min-width: 3rem;
  border: 0;
  border-radius: 999px;
  padding: 0.44rem 0.68rem;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  cursor: pointer;
}

.lang-button.is-active {
  color: white;
  background: var(--teal);
}

.section-band,
.section,
.site-footer {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.76fr);
  align-items: center;
  min-height: calc(100vh - 4.25rem);
  padding: clamp(3rem, 7vw, 5.5rem) 0 5rem;
  gap: clamp(2rem, 5vw, 4.5rem);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--teal-dark);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 1.15rem;
  letter-spacing: 0;
}

.hero-name {
  display: block;
  font-size: clamp(2.6rem, 6vw, 4.8rem);
  line-height: 0.92;
  font-weight: 900;
}

.hero-cn {
  display: inline-flex;
  margin-top: 0.8rem;
  color: var(--coral);
  font-family: "Microsoft YaHei", "PingFang SC", serif;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.05;
  font-weight: 900;
}

.hero-subtitle {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--soft-ink);
  font-size: clamp(1.08rem, 2vw, 1.34rem);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.05rem;
  border-radius: 999px;
  padding: 0.78rem 1.12rem;
  font-size: 0.96rem;
  font-weight: 850;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: white;
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  box-shadow: 0 12px 30px rgba(45, 138, 124, 0.24);
}

.button.secondary {
  color: #7e4637;
  background: rgba(255, 239, 228, 0.92);
  border: 1px solid rgba(231, 127, 100, 0.24);
}

.button.ghost {
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(45, 138, 124, 0.22);
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 2.2rem;
}

.proof-strip div {
  min-height: 5.6rem;
  border: 1px solid rgba(234, 220, 199, 0.84);
  border-radius: 8px;
  padding: 0.9rem;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 8px 28px rgba(72, 56, 32, 0.06);
}

.proof-strip strong {
  display: block;
  color: var(--teal-dark);
  font-size: 1.35rem;
  line-height: 1;
}

.proof-strip span {
  display: block;
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.hero-visual {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 0.95rem;
}

.duo-avatar-frame {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(0.6rem, 2vw, 1rem);
  width: min(100%, 560px);
}

.avatar-frame {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
}

.avatar-frame-yao {
  width: clamp(220px, 18vw, 280px);
}

.avatar-frame-duo {
  width: min(100%, 430px);
}

.avatar-frame-jin {
  width: clamp(220px, 18vw, 280px);
  margin-top: 0;
}

.avatar-frame::before {
  content: "";
  position: absolute;
  inset: 4% 0 0;
  border-radius: 38% 62% 44% 56%;
  background: linear-gradient(135deg, rgba(220, 235, 221, 0.96), rgba(255, 231, 193, 0.9));
  box-shadow: var(--shadow-soft);
}

.avatar-frame img {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border: 10px solid rgba(255, 255, 255, 0.84);
  border-radius: 28px;
  box-shadow: 0 22px 58px rgba(65, 49, 34, 0.16);
}

.avatar-note {
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 999px;
  padding: 0.5rem 0.85rem;
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.74);
  font-size: 0.9rem;
  font-weight: 800;
  box-shadow: 0 8px 22px rgba(72, 56, 32, 0.07);
}

.section {
  padding: clamp(3.8rem, 8vw, 5.6rem) 0;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 1.8rem;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(2rem, 4.2vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 1.18rem;
  line-height: 1.28;
}

.section-intro {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.06rem;
}

.about-layout,
.feature-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(320px, 1fr);
  gap: 1rem;
}

.feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.text-panel,
.feature-card,
.topic-card,
.identity-card,
.contact-card {
  border: 1px solid rgba(234, 220, 199, 0.88);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow-card);
}

.lead-panel,
.text-panel {
  padding: clamp(1.35rem, 3vw, 2rem);
  color: var(--soft-ink);
  font-size: 1.07rem;
}

.lead-panel p,
.podcast-panel p {
  margin-bottom: 0;
}

.identity-card,
.person-card {
  padding: 1.35rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 240, 231, 0.8));
}

.identity-card p {
  margin-bottom: 0.9rem;
  color: var(--teal-dark);
  font-weight: 900;
}

.people-grid {
  display: grid;
  gap: 1rem;
}

.person-card {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  border: 1px solid rgba(234, 220, 199, 0.88);
  border-radius: 8px;
  box-shadow: var(--shadow-card);
}

.person-card img {
  width: 92px;
  aspect-ratio: 1;
  border: 5px solid rgba(255, 255, 255, 0.84);
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(65, 49, 34, 0.12);
}

.person-card h3 {
  color: var(--teal-dark);
}

.identity-card ul,
.person-card ul,
.collab-list {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.identity-card li,
.person-card li,
.collab-list li {
  position: relative;
  padding-left: 1.05rem;
  color: var(--soft-ink);
}

.identity-card li::before,
.person-card li::before,
.collab-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--coral);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.topic-card {
  min-height: 172px;
  padding: 1.18rem;
  background: rgba(255, 255, 255, 0.78);
}

.topic-card span {
  display: inline-flex;
  margin-bottom: 0.85rem;
  color: var(--teal-dark);
  font-weight: 900;
}

.topic-card p,
.feature-card p,
.contact-card span {
  color: var(--muted);
}

.feature-card {
  padding: clamp(1.25rem, 2.8vw, 1.75rem);
}

.feature-card.accent-green {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(238, 248, 239, 0.92));
}

.feature-card.accent-coral {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 240, 231, 0.92));
}

.link-row,
.platform-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.62rem;
  margin-top: 1.2rem;
}

.link-row a,
.platform-list a,
.inline-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.65rem;
  border-radius: 999px;
  padding: 0.58rem 0.92rem;
  color: var(--teal-dark);
  background: rgba(45, 138, 124, 0.1);
  font-weight: 850;
}

.link-row a:hover,
.platform-list a:hover,
.inline-link:hover {
  background: rgba(45, 138, 124, 0.16);
}

.disclaimer {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 750;
}

.podcast-panel {
  max-width: none;
}

.digital-twin {
  padding-top: clamp(3.8rem, 8vw, 5.6rem);
}

.twin-inner {
  display: grid;
  grid-template-columns: minmax(220px, 0.46fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(1.4rem, 4vw, 2.5rem);
  border: 1px solid rgba(234, 220, 199, 0.88);
  border-radius: 8px;
  padding: clamp(1.25rem, 4vw, 2.2rem);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 240, 231, 0.76)),
    var(--paper);
  box-shadow: var(--shadow-soft);
}

.twin-avatar,
.twin-avatar-options {
  position: relative;
  display: grid;
  place-items: center;
}

.twin-avatar::before,
.twin-avatar-options::before {
  content: "";
  position: absolute;
  inset: 9% 5% 2%;
  border-radius: 45% 55% 50% 50%;
  background: linear-gradient(135deg, rgba(220, 235, 221, 0.9), rgba(255, 231, 193, 0.86));
}

.twin-avatar img,
.twin-avatar-option img {
  position: relative;
  width: min(100%, 260px);
  aspect-ratio: 1;
  object-fit: cover;
  border: 8px solid rgba(255, 255, 255, 0.86);
  border-radius: 24px;
  box-shadow: 0 16px 42px rgba(65, 49, 34, 0.14);
}

.twin-avatar-options {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.twin-avatar-option {
  position: relative;
  display: grid;
  gap: 0.55rem;
  justify-items: center;
  border: 0;
  padding: 0;
  color: var(--teal-dark);
  background: transparent;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.twin-avatar-option img {
  width: min(100%, 164px);
  border-width: 7px;
  border-radius: 22px;
}

.twin-avatar-option span {
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 999px;
  padding: 0.34rem 0.78rem;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 8px 22px rgba(72, 56, 32, 0.07);
}

.twin-avatar-option.is-active img {
  border-color: rgba(45, 138, 124, 0.34);
  box-shadow: 0 18px 46px rgba(45, 138, 124, 0.18);
}

.twin-avatar-option.is-active span {
  color: white;
  border-color: var(--teal);
  background: var(--teal);
}

.twin-copy p {
  max-width: 720px;
  color: var(--soft-ink);
}

.twin-button {
  margin-top: 0.65rem;
  border: 0;
  cursor: pointer;
}

.twin-note-link {
  margin: 1rem 0 0;
  color: var(--teal-dark);
  font-weight: 800;
}

.twin-chat {
  margin-top: 1.35rem;
}

.chat-bubble {
  position: relative;
  max-width: 760px;
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 12px 32px rgba(65, 49, 34, 0.08);
}

.chat-bubble::before {
  content: "";
  position: absolute;
  top: 1.1rem;
  left: -0.48rem;
  width: 0.85rem;
  height: 0.85rem;
  border-left: 1px solid rgba(45, 138, 124, 0.18);
  border-bottom: 1px solid rgba(45, 138, 124, 0.18);
  background: rgba(255, 255, 255, 0.82);
  transform: rotate(45deg);
}

.chat-bubble p {
  margin-bottom: 0;
  color: var(--ink);
}

.chat-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.58rem;
  margin-top: 0.95rem;
}

.chat-prompt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.35rem;
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 999px;
  padding: 0.48rem 0.78rem;
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.68);
  font: inherit;
  font-size: 0.93rem;
  font-weight: 700;
  line-height: 1.25;
  cursor: pointer;
}

.chat-prompt:hover,
.chat-prompt.is-active {
  color: white;
  border-color: var(--teal);
  background: var(--teal);
}

.note-section {
  padding-top: clamp(3.4rem, 7vw, 5rem);
}

.note-form {
  border: 1px solid rgba(234, 220, 199, 0.88);
  border-radius: 8px;
  padding: clamp(1.2rem, 3vw, 1.85rem);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(238, 248, 239, 0.74)),
    var(--paper);
  box-shadow: var(--shadow-card);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.form-field {
  display: grid;
  gap: 0.45rem;
  color: var(--teal-dark);
  font-weight: 850;
}

.form-field-wide {
  grid-column: 1 / -1;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  border: 1px solid rgba(45, 138, 124, 0.2);
  border-radius: 8px;
  padding: 0.82rem 0.9rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.88);
  font: inherit;
  font-weight: 500;
  outline: none;
}

.form-field textarea {
  min-height: 8.6rem;
  resize: vertical;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(45, 138, 124, 0.12);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-top: 1rem;
}

.form-actions .button {
  border: 0;
  cursor: pointer;
}

.privacy-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.form-feedback {
  min-height: 1.5rem;
  margin: 0.85rem 0 0;
  color: var(--teal-dark);
  font-weight: 800;
}

.form-feedback.is-error {
  color: #a74938;
}

.contact {
  padding-bottom: 4rem;
}

.contact-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.72fr);
  gap: 1.25rem;
  align-items: stretch;
  border: 1px solid rgba(45, 138, 124, 0.12);
  border-radius: 8px;
  padding: clamp(1.35rem, 4vw, 2.35rem);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.86), rgba(238, 248, 239, 0.76)),
    var(--paper);
  box-shadow: var(--shadow-soft);
}

.contact-copy h2 {
  color: var(--ink);
}

.contact-copy p {
  max-width: 650px;
  color: var(--soft-ink);
}

.collab-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.15rem;
}

.collab-list li {
  border: 1px solid rgba(234, 220, 199, 0.78);
  border-radius: 8px;
  padding: 0.62rem 0.72rem 0.62rem 1.7rem;
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.95rem;
}

.collab-list li::before {
  left: 0.75rem;
}

.collab-boundary {
  margin: 1rem 0 0;
  border: 1px solid rgba(231, 127, 100, 0.22);
  border-radius: 8px;
  padding: 0.85rem 0.95rem;
  color: #7e4637;
  background: rgba(255, 240, 231, 0.72);
  font-weight: 750;
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 138px;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
}

.contact-card a {
  color: var(--teal-dark);
  font-weight: 900;
  overflow-wrap: anywhere;
}

.contact-card p {
  margin-bottom: 0;
  color: var(--ink);
  font-weight: 850;
}

.contact-details {
  display: grid;
  gap: 0.65rem;
}

.wechat-qr {
  margin: 0;
  text-align: center;
}

.wechat-qr img {
  display: block;
  width: 138px;
  aspect-ratio: 1;
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 8px;
  background: white;
  object-fit: contain;
}

.wechat-qr figcaption {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.knowledge-tree {
  border-top: 1px solid rgba(234, 220, 199, 0.72);
  border-bottom: 1px solid rgba(234, 220, 199, 0.72);
}

.knowledge-guide-hero {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(1.2rem, 4vw, 2.7rem);
  align-items: center;
  margin-bottom: clamp(1.4rem, 4vw, 2rem);
  border: 1px solid rgba(45, 138, 124, 0.12);
  border-radius: 8px;
  padding: clamp(1.2rem, 4vw, 2.35rem);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(255, 240, 231, 0.76)),
    var(--paper);
  box-shadow: var(--shadow-soft);
}

.knowledge-guide-avatars {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.95rem;
  align-items: end;
}

.knowledge-guide-avatars::before {
  content: "";
  position: absolute;
  inset: 28% -5% -13%;
  border-radius: 48% 52% 40% 60%;
  background: linear-gradient(135deg, rgba(220, 235, 221, 0.82), rgba(255, 231, 193, 0.72));
}

.knowledge-guide-avatar {
  position: relative;
  display: grid;
  gap: 0.48rem;
  justify-items: center;
  border: 0;
  padding: 0;
  color: var(--teal-dark);
  background: transparent;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.knowledge-guide-avatar img {
  width: min(100%, 220px);
  aspect-ratio: 1;
  border: 7px solid rgba(255, 255, 255, 0.86);
  border-radius: 22px;
  box-shadow: 0 16px 42px rgba(65, 49, 34, 0.14);
  object-fit: cover;
}

.knowledge-guide-avatar span {
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 999px;
  padding: 0.34rem 0.78rem;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 8px 22px rgba(72, 56, 32, 0.07);
}

.knowledge-guide-avatar small {
  max-width: 12rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.45;
  text-align: center;
}

.knowledge-guide-avatar.is-active img {
  border-color: rgba(45, 138, 124, 0.36);
  box-shadow: 0 18px 46px rgba(45, 138, 124, 0.18);
}

.knowledge-guide-avatar.is-active span {
  color: white;
  border-color: var(--teal);
  background: var(--teal);
}

.knowledge-guide-copy h2 {
  max-width: 880px;
  margin-bottom: 0.75rem;
  font-size: clamp(1.35rem, 3.55vw, 2.8rem);
  line-height: 1.06;
  letter-spacing: 0;
}

.knowledge-guide-copy .section-intro {
  max-width: 870px;
}

.knowledge-guide-bubble {
  position: relative;
  max-width: 880px;
  margin-top: 1.35rem;
  border: 1px solid rgba(45, 138, 124, 0.18);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 12px 32px rgba(65, 49, 34, 0.08);
}

.knowledge-guide-bubble::before {
  content: "";
  position: absolute;
  left: -0.48rem;
  top: 1.3rem;
  width: 0.85rem;
  height: 0.85rem;
  border-left: 1px solid rgba(45, 138, 124, 0.18);
  border-bottom: 1px solid rgba(45, 138, 124, 0.18);
  background: rgba(255, 255, 255, 0.84);
  transform: rotate(45deg);
}

.knowledge-guide-bubble strong {
  display: inline-flex;
  margin-bottom: 0.3rem;
  color: var(--teal-dark);
}

.knowledge-guide-bubble[data-active-guide="jin"] strong {
  color: var(--coral);
}

.knowledge-guide-bubble p {
  margin-bottom: 0;
  color: var(--soft-ink);
}

.knowledge-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.85fr);
  gap: clamp(1rem, 3vw, 1.6rem);
  align-items: start;
}

.knowledge-layout:not(.has-guide) {
  display: none;
}

.knowledge-layout.has-guide:not(.has-detail) {
  display: block;
}

.knowledge-layout.has-guide:not(.has-detail) .knowledge-primary {
  position: static;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.knowledge-layout.has-guide:not(.has-detail) .knowledge-detail {
  display: none;
}

.knowledge-primary {
  position: sticky;
  top: 5.8rem;
  display: grid;
  gap: 0.72rem;
}

.knowledge-entry-button {
  display: grid;
  gap: 0.42rem;
  width: 100%;
  border: 1px solid rgba(234, 220, 199, 0.9);
  border-radius: 8px;
  padding: 0.95rem;
  color: var(--soft-ink);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-card);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.knowledge-topic-button {
  min-height: 10.5rem;
  padding: 1.15rem;
}

.knowledge-entry-button:hover,
.knowledge-entry-button.is-active {
  border-color: rgba(45, 138, 124, 0.34);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(238, 248, 239, 0.9));
}

.knowledge-entry-button strong {
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.35;
}

.knowledge-entry-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}

.knowledge-entry-button > span:last-child {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.56;
}

.knowledge-entry-index {
  color: var(--coral);
  font-size: 0.76rem;
  font-weight: 900;
}

.knowledge-guide-badge {
  border: 1px solid rgba(45, 138, 124, 0.16);
  border-radius: 999px;
  padding: 0.16rem 0.48rem;
  color: var(--teal-dark);
  background: rgba(238, 248, 239, 0.76);
  font-size: 0.74rem;
  font-weight: 900;
}

.knowledge-detail {
  min-width: 0;
}

.knowledge-loading,
.knowledge-empty,
.knowledge-focus {
  border: 1px solid rgba(234, 220, 199, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow-soft);
}

.knowledge-loading,
.knowledge-empty {
  padding: 1.25rem;
  color: var(--muted);
}

.knowledge-empty {
  display: grid;
  gap: 0.3rem;
}

.knowledge-focus {
  overflow: hidden;
}

.knowledge-focus-head {
  padding: clamp(1.25rem, 3vw, 1.8rem);
  background: linear-gradient(135deg, rgba(238, 248, 239, 0.92), rgba(255, 240, 231, 0.76));
}

.knowledge-back-button {
  display: inline-flex;
  margin-bottom: 1rem;
  border: 1px solid rgba(45, 138, 124, 0.2);
  border-radius: 999px;
  padding: 0.48rem 0.78rem;
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.82);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 900;
  cursor: pointer;
}

.knowledge-back-button:hover {
  border-color: rgba(45, 138, 124, 0.36);
  background: rgba(238, 248, 239, 0.9);
}

.knowledge-focus-head h3 {
  margin-bottom: 0.6rem;
  font-size: clamp(1.42rem, 3vw, 2.1rem);
  line-height: 1.22;
}

.knowledge-focus-head p:last-child {
  max-width: 860px;
  margin-bottom: 0;
  color: var(--soft-ink);
  font-size: 1.06rem;
}

.knowledge-section-list {
  display: grid;
  gap: 1rem;
  padding: clamp(1rem, 2.4vw, 1.35rem);
}

.knowledge-section-block {
  display: grid;
  gap: 1rem;
}

.knowledge-section-head {
  border-left: 4px solid var(--teal);
  padding: 0.12rem 0 0.1rem 0.95rem;
}

.knowledge-section-head h4 {
  margin-bottom: 0.45rem;
  font-size: 1.14rem;
}

.knowledge-question,
.knowledge-answer,
.knowledge-source {
  margin-bottom: 0.35rem;
  color: var(--muted);
}

.knowledge-answer {
  color: var(--soft-ink);
  font-weight: 800;
}

.knowledge-source {
  font-size: 0.86rem;
  font-weight: 800;
}

.knowledge-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.knowledge-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  border: 1px solid rgba(234, 220, 199, 0.88);
  border-radius: 8px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.78);
}

.knowledge-card h5 {
  margin: 0 0 0.55rem;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.42;
}

.knowledge-card p {
  margin-bottom: 0.65rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.knowledge-card-opinion {
  color: var(--teal-dark) !important;
  font-weight: 900;
}

.knowledge-card details {
  margin-top: auto;
  border-top: 1px solid rgba(234, 220, 199, 0.78);
  padding-top: 0.68rem;
}

.knowledge-card summary {
  color: var(--coral);
  font-weight: 900;
  cursor: pointer;
}

.knowledge-card-full {
  margin-top: 0.75rem;
}

.knowledge-card-full p {
  color: var(--soft-ink);
}

.knowledge-disclaimer {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.knowledge-note-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  margin-top: 1.1rem;
  border: 1px solid rgba(45, 138, 124, 0.14);
  border-radius: 8px;
  padding: clamp(1rem, 2.5vw, 1.35rem);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(238, 248, 239, 0.72)),
    var(--paper);
  box-shadow: var(--shadow-card);
}

.knowledge-note-cta h3 {
  margin-bottom: 0.35rem;
  font-size: clamp(1.16rem, 2vw, 1.45rem);
}

.knowledge-note-cta p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.knowledge-note-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
}

.site-footer {
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

[data-lang-active="zh"] [data-i18n$=".en"],
[data-lang-active="en"] [data-i18n$=".zh"] {
  display: none;
}

@media (max-width: 920px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    grid-column: 1 / -1;
    justify-content: flex-start;
    order: 3;
    overflow-x: auto;
    padding-bottom: 0.2rem;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .hero,
  .about-layout,
  .twin-inner,
  .contact-inner,
  .feature-grid,
  .topic-grid,
  .knowledge-guide-hero,
  .knowledge-layout,
  .knowledge-note-cta,
  .knowledge-card-grid {
    grid-template-columns: 1fr;
  }

  .knowledge-primary {
    position: static;
  }

  .knowledge-guide-avatars {
    max-width: 390px;
  }

  .knowledge-note-actions {
    justify-content: flex-start;
  }

  .knowledge-layout.has-guide:not(.has-detail) .knowledge-primary {
    grid-template-columns: 1fr;
  }

  .knowledge-guide-bubble::before {
    top: -0.42rem;
    left: 1.3rem;
    border: 0;
    border-top: 1px solid rgba(45, 138, 124, 0.18);
    border-left: 1px solid rgba(45, 138, 124, 0.18);
  }

  .hero {
    min-height: auto;
    padding: 2.7rem 0 4rem;
  }

  .hero-copy {
    max-width: none;
  }

  .hero-visual {
    justify-items: start;
  }

  .duo-avatar-frame {
    width: min(92vw, 520px);
  }

  .avatar-frame-duo {
    width: min(86vw, 380px);
  }

  .avatar-frame img {
    border-radius: 22px;
  }

  .proof-strip {
    grid-template-columns: 1fr;
  }

  .collab-list {
    grid-template-columns: 1fr;
  }

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

  .wechat-qr {
    justify-self: start;
  }

  .twin-avatar {
    justify-content: start;
  }

  .twin-avatar-options {
    justify-content: start;
    place-items: start;
    max-width: 370px;
  }

  .chat-bubble::before {
    top: -0.42rem;
    left: 1.3rem;
    border: 0;
    border-top: 1px solid rgba(45, 138, 124, 0.18);
    border-left: 1px solid rgba(45, 138, 124, 0.18);
  }

  .form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .section-band,
  .section,
  .site-header,
  .site-footer {
    width: min(100% - 1.1rem, 1180px);
  }

  .site-header {
    gap: 0.65rem;
    padding-top: 0.72rem;
  }

  .brand small {
    display: none;
  }

  .nav-links {
    gap: 0.72rem;
    font-size: 0.83rem;
  }

  .language-switch {
    justify-self: end;
  }

  .lang-button {
    min-width: 2.68rem;
    padding-inline: 0.55rem;
  }

  .hero {
    padding-top: 2.25rem;
    gap: 1.8rem;
  }

  .hero-name {
    font-size: clamp(2.4rem, 12vw, 3.4rem);
  }

  .hero-cn {
    font-size: clamp(1.9rem, 11vw, 2.7rem);
  }

  .hero-subtitle,
  .section-intro,
  .lead-panel,
  .text-panel {
    font-size: 1rem;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }

  .button {
    width: 100%;
    min-height: 3rem;
  }

  .section {
    padding: 3.35rem 0;
  }

  .topic-card {
    min-height: auto;
  }

  .knowledge-entry-button > span:last-child {
    font-size: 0.84rem;
  }

  .knowledge-focus-head,
  .knowledge-section-list {
    padding: 1rem;
  }

  .knowledge-guide-hero {
    padding: 1rem;
  }

  .knowledge-guide-copy h2 {
    font-size: clamp(1.3rem, 6.7vw, 1.85rem);
  }

  .knowledge-guide-avatar img {
    width: min(38vw, 170px);
  }

  .knowledge-topic-button {
    min-height: auto;
  }

  .link-row a,
  .platform-list a,
  .inline-link {
    flex: 1 1 calc(50% - 0.62rem);
    min-width: 8rem;
  }

  .twin-avatar img {
    width: min(72vw, 220px);
  }

  .twin-avatar-options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: none;
  }

  .twin-avatar-option img {
    width: min(36vw, 150px);
  }

  .duo-avatar-frame {
    grid-template-columns: 1fr;
    width: min(78vw, 280px);
  }

  .avatar-frame-jin {
    margin-top: 0.85rem;
    margin-left: 0;
  }

  .avatar-frame-yao,
  .avatar-frame-jin {
    width: min(78vw, 280px);
  }

  .avatar-frame-duo {
    width: min(78vw, 300px);
  }

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

  .person-card img {
    width: 104px;
  }

  .chat-prompts {
    display: grid;
    grid-template-columns: 1fr;
  }

  .chat-prompt {
    width: 100%;
    justify-content: flex-start;
    text-align: left;
  }

  .form-actions {
    display: grid;
    grid-template-columns: 1fr;
  }
}