:root {
  --ink: #1c1917;
  --ink-soft: #44403c;
  --paper: #faf7f2;
  --paper-deep: #f0ebe3;
  --cinnabar: #b91c1c;
  --cinnabar-dark: #991b1b;
  --gold: #ca8a04;
  --gold-light: #eab308;
  --white: #ffffff;
  --shadow: 0 12px 40px rgba(28, 25, 23, 0.08);
  --shadow-card: 0 1px 2px rgba(28, 25, 23, 0.04),
    0 4px 20px rgba(28, 25, 23, 0.06);
  --border-card: 1px solid rgba(28, 25, 23, 0.08);
  --radius: 12px;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-display: "ZCOOL XiaoWei", var(--font-serif);
  --page-pad-x: clamp(1rem, 4vw, 1.5rem);
  --touch-min: 44px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

body.mobile-nav-open {
  overflow: hidden;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--cinnabar);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-left: max(var(--page-pad-x), env(safe-area-inset-left, 0px));
  padding-right: max(var(--page-pad-x), env(safe-area-inset-right, 0px));
  box-sizing: border-box;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(28, 25, 23, 0.06);
  padding-top: env(safe-area-inset-top, 0px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.08em;
}

.logo:hover {
  color: var(--cinnabar);
  text-decoration: none;
}

.nav {
  display: none;
  gap: 1.75rem;
  align-items: center;
}

.nav a {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.nav a:hover {
  color: var(--cinnabar);
  text-decoration: none;
}

.nav a.is-active,
.nav a[aria-current="page"] {
  color: var(--cinnabar);
  font-weight: 600;
}

.nav-cta.is-active,
.nav-cta[aria-current="page"] {
  color: var(--white) !important;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.4);
}

.mobile-nav a[aria-current="page"] {
  color: var(--cinnabar);
  font-weight: 600;
}

.nav-cta {
  padding: 0.45rem 1rem;
  background: var(--cinnabar);
  color: var(--white) !important;
  border-radius: 999px;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--cinnabar-dark);
  text-decoration: none;
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
  align-items: center;
  min-width: var(--touch-min);
  min-height: var(--touch-min);
  padding: 0.5rem;
  border: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  padding: 0.25rem max(var(--page-pad-x), env(safe-area-inset-left, 0px))
    max(1rem, env(safe-area-inset-bottom, 0px)) max(var(--page-pad-x), env(safe-area-inset-right, 0px));
  gap: 0.25rem;
  border-bottom: 1px solid rgba(28, 25, 23, 0.08);
  max-height: 70vh;
  max-height: min(70vh, 100dvh);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav a {
  color: var(--ink);
  padding: 0.65rem 0;
  font-size: 1rem;
  min-height: var(--touch-min);
  display: flex;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
}

.mobile-nav[hidden] {
  display: none;
}

@media (min-width: 768px) {
  .nav {
    display: flex;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }
}

/* Hero */
.hero {
  position: relative;
  padding: clamp(3rem, 10vw, 6rem) 0 clamp(4rem, 12vw, 7rem);
  overflow: hidden;
  background: linear-gradient(
    165deg,
    var(--paper-deep) 0%,
    var(--paper) 45%,
    #fff9f0 100%
  );
}

.hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: radial-gradient(
      circle at 20% 30%,
      rgba(185, 28, 28, 0.08) 0%,
      transparent 45%
    ),
    radial-gradient(
      circle at 80% 70%,
      rgba(202, 138, 4, 0.12) 0%,
      transparent 40%
    );
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 36rem;
}

/* 首页 · 讲师与 APP 卡片 */
.home-stack {
  max-width: 1040px;
  margin-inline: auto;
}

.home-panel {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: stretch;
  background: var(--white);
  border-radius: 18px;
  border: 1px solid rgba(28, 25, 23, 0.07);
  box-shadow: var(--shadow-card), 0 1px 0 rgba(255, 255, 255, 0.75) inset;
  padding: clamp(1.35rem, 4vw, 2.25rem);
}

.home-panel--teacher {
  grid-template-columns: 1fr;
}

.home-panel__media {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.home-panel__photo {
  display: block;
  border-radius: 14px;
  overflow: hidden;
  line-height: 0;
  box-shadow: 0 12px 40px rgba(28, 25, 23, 0.1);
  border: 1px solid rgba(28, 25, 23, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  max-width: 300px;
  width: 100%;
}

.home-panel__photo:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 48px rgba(28, 25, 23, 0.14);
  text-decoration: none;
}

.home-panel__photo img {
  width: 100%;
  height: auto;
  display: block;
  vertical-align: middle;
}

.home-panel__media-cap {
  margin: 0.75rem 0 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.home-panel__body {
  min-width: 0;
}

.home-panel__tag {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
  text-transform: uppercase;
}

.home-panel__h1 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.2vw, 2.35rem);
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
}

.home-panel__company {
  margin: 0 0 1.1rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.home-panel__text {
  margin: 0 0 1.35rem;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
  text-align: justify;
  text-justify: inter-ideograph;
}

.home-panel__text strong {
  color: var(--ink);
  font-weight: 600;
}

.home-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.home-panel__actions--left {
  justify-content: flex-start;
}

.section-app-intro {
  background: linear-gradient(180deg, var(--paper-deep) 0%, var(--paper) 100%);
  padding-top: clamp(2rem, 6vw, 3rem);
  padding-bottom: clamp(2.5rem, 7vw, 4rem);
}

.home-panel--app {
  grid-template-columns: 1fr;
  align-items: start;
  background: linear-gradient(165deg, #fffefb 0%, var(--white) 100%);
  border-color: rgba(185, 28, 28, 0.12);
}

.home-panel__body--app {
  order: 1;
}

.home-panel__app-head {
  display: flex;
  align-items: center;
  gap: 1rem 1.15rem;
  margin-bottom: 1rem;
}

.home-panel__app-icon {
  flex-shrink: 0;
  width: clamp(4rem, 14vw, 5rem);
  height: clamp(4rem, 14vw, 5rem);
  border-radius: 22%;
  object-fit: cover;
  border: 1px solid rgba(28, 25, 23, 0.08);
  box-shadow: 0 4px 16px rgba(106, 13, 173, 0.12), 0 2px 8px rgba(28, 25, 23, 0.06);
}

.home-panel__app-head-text {
  min-width: 0;
}

.home-panel__h2 {
  margin: 0 0 0.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.5vw, 1.85rem);
  font-weight: 400;
  color: var(--ink);
}

.home-panel__app-sub {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.home-panel__text--app {
  margin-bottom: 1rem;
  text-align: justify;
  text-justify: inter-ideograph;
}

.home-panel__bullets {
  margin: 0 0 1.35rem;
  padding: 0.85rem 1rem 0.85rem 1.35rem;
  background: var(--paper-deep);
  border-radius: 10px;
  border-left: 3px solid var(--cinnabar);
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.7;
}

.home-panel__bullets li {
  margin-bottom: 0.4rem;
}

.home-panel__bullets li:last-child {
  margin-bottom: 0;
}

.home-panel__bullets strong {
  color: var(--ink);
}

.home-panel__qrbox {
  order: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0.5rem 0 0;
}

.home-panel__qrframe {
  padding: 0.65rem;
  background: var(--white);
  border-radius: 14px;
  border: 1px dashed rgba(28, 25, 23, 0.18);
  box-shadow: var(--shadow);
}

.home-panel__qrframe img {
  display: block;
  width: min(188px, 58vw);
  height: auto;
  border-radius: 8px;
}

.home-panel__qr-note {
  margin: 0.6rem 0 0;
  font-size: 0.76rem;
  color: var(--ink-soft);
  max-width: 14rem;
  line-height: 1.45;
}

@media (min-width: 768px) {
  .home-panel--teacher {
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    align-items: start;
    gap: 2rem 2.5rem;
  }

  .home-panel--teacher .home-panel__media {
    align-items: stretch;
    text-align: left;
  }

  .home-panel--teacher .home-panel__photo {
    max-width: none;
  }

  .home-panel--teacher .home-panel__media-cap {
    text-align: center;
  }

  .home-panel--app {
    grid-template-columns: minmax(0, 1fr) minmax(160px, 220px);
    gap: 2rem 2.5rem;
    align-items: center;
  }

  .home-panel__body--app {
    order: 0;
  }

  .home-panel__qrbox {
    order: 0;
    padding: 0;
    align-self: center;
  }
}

@media (max-width: 767px) {
  .home-panel__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .home-panel__actions .btn {
    width: 100%;
    min-height: var(--touch-min);
    box-sizing: border-box;
  }

  .home-panel__text,
  .home-panel__text--app {
    text-align: left;
  }
}

.hero-eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--cinnabar);
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
}

.hero-sub {
  margin: -0.5rem 0 1rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.hero-lead {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.hero-lead strong {
  color: var(--ink);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--cinnabar);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(185, 28, 28, 0.35);
}

.btn-primary:hover {
  background: var(--cinnabar-dark);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: rgba(28, 25, 23, 0.2);
}

.btn-ghost:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

/* Sections */
.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

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

.section-head {
  text-align: left;
  max-width: 40rem;
  margin: 0 0 2.5rem;
}

.section-head--center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  max-width: 36rem;
}

.section-head h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.5vw, 2rem);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.section-head:not(.section-head--center) h2::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 2px;
  margin-top: 0.65rem;
  background: var(--cinnabar);
  border-radius: 1px;
}

.section-head--center h2::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 2px;
  margin: 0.65rem auto 0;
  background: var(--cinnabar);
  border-radius: 1px;
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.65;
}

.section-head-light h2,
.section-head-light p {
  color: var(--paper);
}

.section-head-light p {
  opacity: 0.92;
}

.grid.cards {
  display: grid;
  gap: 1.5rem;
}

.teaser-cards.grid.cards {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid.cards:not(.teaser-cards) {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (min-width: 960px) {
  .teaser-cards.grid.cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .teaser-cards.grid.cards {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: var(--white);
  padding: 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border: var(--border-card);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: 1rem;
  background: var(--paper-deep);
  color: var(--cinnabar);
  font-size: 1rem;
  font-weight: 700;
  border-radius: 8px;
  border: 1px solid rgba(185, 28, 28, 0.2);
}

.card h3,
.card .card-title {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card-link:hover {
  color: inherit;
  text-decoration: none;
}

.card-more {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--cinnabar);
}

@media (hover: hover) and (pointer: fine) {
  .card-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 48px rgba(28, 25, 23, 0.12);
    border-color: rgba(185, 28, 28, 0.2);
  }

  .card-link:hover .card-more {
    text-decoration: underline;
    text-underline-offset: 3px;
  }
}

.card-link--featured {
  border: 1px solid rgba(185, 28, 28, 0.22);
  background: linear-gradient(180deg, #fffdf8 0%, var(--white) 100%);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(185, 28, 28, 0.05);
}

@media (hover: hover) and (pointer: fine) {
  .card-link--featured:hover {
    border-color: rgba(185, 28, 28, 0.45);
  }
}

.card--highlight {
  border: 1px solid rgba(185, 28, 28, 0.22);
  background: linear-gradient(165deg, #fffefb 0%, var(--white) 100%);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(185, 28, 28, 0.06);
}

.card-cta {
  margin: 0.75rem 0 0;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--cinnabar);
}

.card-cta a {
  color: var(--cinnabar);
}

.card-cta a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

/* Split */
.split {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 900px) {
  .split {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

.split-text h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2rem);
  font-weight: 400;
}

.split-text > p {
  margin: 0 0 1.25rem;
  color: var(--ink-soft);
}

.feature-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--ink-soft);
}

.feature-list li {
  margin-bottom: 0.35rem;
}

.paper-frame {
  background: var(--white);
  padding: 2rem 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(185, 28, 28, 0.15);
  border-top: 4px solid var(--cinnabar);
}

.paper-frame blockquote {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-style: normal;
  color: var(--ink);
  line-height: 1.6;
}

.paper-frame cite {
  font-size: 0.9rem;
  color: var(--ink-soft);
  font-style: normal;
}

.banner-strip {
  background: linear-gradient(90deg, var(--cinnabar-dark), var(--cinnabar));
  color: var(--white);
  padding: 1.5rem 1.75rem;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow);
}

.banner-strip p {
  margin: 0;
  font-size: 1.05rem;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.pill {
  padding: 0.5rem 1rem;
  background: var(--white);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--ink-soft);
  border: 1px solid rgba(28, 25, 23, 0.08);
}

/* Services */
.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 720px;
  margin-inline: auto;
}

.service-list li {
  padding: 1.5rem 0;
  border-bottom: 1px solid rgba(28, 25, 23, 0.08);
}

.service-list li:first-child {
  padding-top: 0;
}

.service-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.service-list :is(h2, h3) {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--ink);
}

.service-list p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.service-list strong {
  color: var(--ink);
  font-weight: 600;
}

.app-download-cta {
  margin: 0 0 1.5rem;
  text-align: center;
  font-size: 0.95rem;
}

.app-download-cta a {
  font-weight: 600;
}

/* App + channels */
.app-panel {
  display: grid;
  gap: 2rem;
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .app-panel {
    grid-template-columns: 220px 1fr;
    align-items: center;
  }
}

.app-qr-block {
  text-align: center;
}

.app-qr-title {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
}

.qr-image {
  display: block;
  width: min(240px, 72vw);
  height: auto;
  margin: 0 auto 0.75rem;
  border-radius: 12px;
  border: 1px solid rgba(28, 25, 23, 0.1);
  box-shadow: var(--shadow);
}

.qr-placeholder {
  width: min(200px, 70vw);
  aspect-ratio: 1;
  margin: 0 auto 0.75rem;
  background: var(--white);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.45;
  text-align: center;
  padding: 0.5rem;
  border: 2px dashed rgba(28, 25, 23, 0.2);
}

.qr-hint {
  margin: 0;
  font-size: 0.8rem;
  opacity: 0.85;
  color: var(--ink-soft);
}

.qr-hint.dark {
  color: var(--ink-soft);
  opacity: 1;
}

.qr-hint code {
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  background: var(--paper-deep);
  border-radius: 4px;
  word-break: break-all;
  overflow-wrap: anywhere;
}

.channel-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.channel-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  background: var(--white);
  border: 1px solid rgba(28, 25, 23, 0.1);
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: border-color 0.2s, transform 0.15s ease;
}

.channel-btn:hover {
  border-color: rgba(185, 28, 28, 0.35);
  text-decoration: none;
  color: var(--ink);
  transform: translateY(-1px);
}

.channel-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cinnabar);
}

.channel-desc {
  margin-top: 0.35rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.channel-btn-h5 .channel-name {
  color: var(--ink);
}

/* WeChat */
.wechat-panel {
  display: grid;
  gap: 1.75rem;
  align-items: center;
  max-width: 720px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .wechat-panel {
    grid-template-columns: auto 1fr;
  }
}

.wechat-qr .qr-placeholder {
  margin: 0;
}

.wechat-qr-image {
  display: block;
  width: min(240px, 72vw);
  height: auto;
  margin: 0 auto;
  border-radius: 12px;
  border: 1px solid rgba(28, 25, 23, 0.1);
  box-shadow: var(--shadow);
}

@media (min-width: 640px) {
  .wechat-qr-image {
    margin: 0;
  }
}

.wechat-copy {
  min-width: 0;
}

.wechat-account {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.15rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid rgba(28, 25, 23, 0.08);
}

.wechat-account__label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.wechat-account__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.5vw, 1.75rem);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.06em;
  line-height: 1.35;
}

.wechat-follow {
  margin: 0;
  padding: 0 0 0 1.2rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ink-soft);
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.wechat-follow li {
  padding-left: 0.35rem;
}

.wechat-follow li::marker {
  color: var(--cinnabar);
  font-weight: 600;
}

.muted {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.muted code {
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  background: var(--paper-deep);
  border-radius: 4px;
  word-break: break-all;
  overflow-wrap: anywhere;
}

.placeholder-text {
  color: var(--cinnabar);
  font-weight: 600;
}

/* Contact */
.contact-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--white);
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border: var(--border-card);
}

.contact-dl {
  margin: 0;
  display: grid;
  gap: 1rem;
}

.contact-dl dt {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.contact-dl dd {
  margin: 0.25rem 0 0;
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.55;
}

/* Inner pages */
.page-main {
  min-height: 50vh;
}

.page-header {
  padding: clamp(2rem, 5vw, 2.75rem) 0;
  background: linear-gradient(
    180deg,
    var(--paper-deep) 0%,
    var(--paper) 100%
  );
  border-bottom: 1px solid rgba(28, 25, 23, 0.06);
}

.page-header h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.8vw, 2.1rem);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.02em;
  max-width: 42rem;
}

.page-lead {
  margin: 0;
  max-width: 42rem;
  font-size: 1.02rem;
  color: var(--ink-soft);
  line-height: 1.75;
}

.page-lead--about {
  max-width: 42rem;
}

.about-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.875rem;
  color: var(--ink-soft);
}

.about-toc a {
  font-weight: 500;
  color: var(--cinnabar);
  text-decoration: none;
}

.about-toc a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-toc__sep {
  user-select: none;
  color: rgba(68, 64, 60, 0.55);
  font-weight: 400;
}

/* 关于我们 · 联系方式模块（电话/邮箱卡片 + 文本条 + 公众号通栏） */
.section-contact {
  border-top: 1px solid rgba(28, 25, 23, 0.06);
}

.contact-shell {
  max-width: 880px;
  margin: 0 auto;
}

.contact-shell__lead {
  margin: 0 0 1.5rem;
  padding: 1rem 1.2rem;
  background: var(--paper-deep);
  border-radius: 10px;
  border-left: 3px solid var(--cinnabar);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.contact-bento {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 560px) {
  .contact-bento {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }

  .contact-knot--text {
    grid-column: 1 / -1;
  }
}

.contact-knot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  min-height: 5.5rem;
  padding: 1.1rem 1.2rem;
  background: var(--white);
  border-radius: 12px;
  border: var(--border-card);
  box-shadow: var(--shadow-card);
}

.contact-knot--action {
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

@media (hover: hover) and (pointer: fine) {
  .contact-knot--action:hover {
    border-color: rgba(185, 28, 28, 0.35);
    box-shadow: 0 4px 24px rgba(28, 25, 23, 0.08);
    text-decoration: none;
  }
}

.contact-knot--text {
  min-height: 0;
}

.contact-knot--company {
  background: linear-gradient(180deg, #fffefb 0%, var(--white) 100%);
}

.contact-knot__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.contact-knot__value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.contact-knot__value--email {
  font-size: clamp(0.95rem, 2.8vw, 1.05rem);
  font-weight: 600;
  word-break: break-all;
  overflow-wrap: anywhere;
  line-height: 1.45;
}

.contact-knot__hint {
  margin-top: auto;
  padding-top: 0.15rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(185, 28, 28, 0.75);
}

.contact-knot__para {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--ink);
}

.contact-wechat-sheet {
  padding: 1.35rem 1.25rem 1.5rem;
  background: var(--paper-deep);
  border-radius: 14px;
  border: 1px solid rgba(28, 25, 23, 0.07);
}

.contact-wechat-sheet__head {
  margin-bottom: 1.15rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(28, 25, 23, 0.08);
}

.contact-wechat-sheet__head h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--ink);
}

.contact-wechat-sheet__head p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.contact-wechat-sheet__body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .contact-wechat-sheet__body {
    flex-direction: row;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 1.75rem 2rem;
  }

  .contact-wechat-sheet__qr {
    flex-shrink: 0;
  }
}

.wechat-qr-image--sheet {
  width: min(200px, 70vw);
  margin: 0;
  box-shadow: var(--shadow-card);
}

.wechat-copy--sheet {
  flex: 1;
  min-width: 0;
  max-width: 26rem;
}

.page-back {
  margin: 2rem 0 0;
  text-align: left;
}

.page-back a {
  font-weight: 600;
}

/* 传统文化讲师页 teacher.html */
.instructor-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.instructor-intro {
  display: grid;
  gap: 2rem;
  align-items: start;
  max-width: 920px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .instructor-intro {
    grid-template-columns: minmax(260px, 380px) 1fr;
    gap: 2.5rem;
  }
}

.instructor-photo-wrap {
  text-align: center;
}

.instructor-photo {
  display: block;
  width: 100%;
  max-width: 380px;
  height: auto;
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(28, 25, 23, 0.08);
}

.instructor-meta__title {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--ink);
}

.instructor-meta__title:not(:first-child) {
  margin-top: 1.5rem;
}

.instructor-role-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--ink-soft);
  line-height: 1.75;
}

.instructor-affiliations {
  margin: 0;
  padding: 0;
  list-style: none;
}

.instructor-affiliations li {
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.85rem;
  background: var(--white);
  border-radius: 8px;
  border-left: 3px solid var(--cinnabar);
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.instructor-bio.prose {
  max-width: 44rem;
  margin: 0 auto;
}

.instructor-bio.prose p {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.85;
}

.instructor-bio.prose p:last-child {
  margin-bottom: 0;
}

.instructor-bio.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.instructor-note {
  max-width: 44rem;
  margin: 2rem auto 0;
  padding: 1rem 1.15rem;
  background: #fef3c7;
  border: 1px solid rgba(180, 83, 9, 0.22);
  border-radius: var(--radius);
  font-size: 0.88rem;
  line-height: 1.65;
  color: #78350f;
}

.instructor-note strong {
  color: #451a03;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: rgba(250, 247, 242, 0.75);
  padding: 2rem 0 max(2rem, env(safe-area-inset-bottom, 0px));
}

.footer-inner {
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  justify-content: center;
  margin: 0 0 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(250, 247, 242, 0.12);
}

.footer-nav a {
  font-size: 0.85rem;
  color: rgba(250, 247, 242, 0.85);
}

.footer-nav a:hover {
  color: var(--white);
}

.footer-brand {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--paper);
}

.footer-address {
  margin: 0 0 0.75rem;
  font-size: 0.88rem;
  line-height: 1.6;
}

.footer-legal {
  margin: 0 auto 1.25rem;
  max-width: 40rem;
  text-align: left;
}

.footer-important {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: rgba(250, 247, 242, 0.82);
  overflow-wrap: break-word;
  word-break: break-word;
}

.footer-important strong {
  color: rgba(250, 247, 242, 0.95);
  font-weight: 700;
}

.footer-disclaimer-meta {
  margin: 0;
  font-size: 0.72rem;
  line-height: 1.55;
  color: rgba(250, 247, 242, 0.6);
}

.footer-icp {
  margin: 0 0 0.85rem;
  font-size: 0.82rem;
  line-height: 1.6;
}

.footer-icp a {
  color: rgba(250, 247, 242, 0.9);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-icp a:hover {
  color: var(--white);
}

.footer-copy {
  margin: 0;
  font-size: 0.8rem;
  opacity: 0.75;
}

/* ---------- 独立 APP 下载页 download.html ---------- */
body.download-page {
  background: linear-gradient(
    180deg,
    #f5f0e8 0%,
    var(--paper) 28%,
    var(--paper-deep) 100%
  );
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.download-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 247, 242, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(28, 25, 23, 0.08);
  padding-top: env(safe-area-inset-top, 0px);
}

.download-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
}

.download-topbar__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: flex-end;
}

.download-topbar__nav a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.download-topbar__nav a:hover {
  color: var(--cinnabar);
  text-decoration: none;
}

.download-landing {
  flex: 1;
  padding: clamp(1.5rem, 6vw, 3rem) 0 clamp(2rem, 8vw, 4rem);
}

.download-landing__inner {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.download-landing__eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  color: var(--cinnabar);
  text-transform: uppercase;
}

.download-landing__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 9vw, 2.75rem);
  font-weight: 400;
  color: var(--ink);
}

.download-landing__lead {
  margin: 0 0 1.75rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--ink-soft);
  text-align: left;
}

.download-landing__qr-wrap {
  margin-bottom: 1.75rem;
}

.download-landing__qr {
  display: block;
  width: min(260px, 72vw);
  height: auto;
  margin: 0 auto 0.75rem;
  border-radius: 14px;
  border: 1px solid rgba(28, 25, 23, 0.1);
  box-shadow: var(--shadow);
}

.download-landing__qr-tip {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--ink-soft);
  text-align: left;
}

.download-landing__qr-tip code {
  font-size: 0.85em;
  padding: 0.08em 0.3em;
  background: var(--paper-deep);
  border-radius: 4px;
  word-break: break-all;
}

.download-landing__stores {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.store-tile {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  border-radius: 14px;
  text-decoration: none;
  color: var(--white);
  min-height: var(--touch-min);
  box-sizing: border-box;
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
  text-align: left;
}

.store-tile:hover {
  text-decoration: none;
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(28, 25, 23, 0.18);
}

.store-tile--ios {
  background: linear-gradient(135deg, #1c1c1e 0%, #3a3a3c 100%);
}

.store-tile--android {
  background: linear-gradient(135deg, #0d7377 0%, #14a085 100%);
}

.store-tile__icon {
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 12px;
}

.store-tile__icon img {
  display: block;
  width: 1.65rem;
  height: 1.65rem;
  object-fit: contain;
}

.store-tile__text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.store-tile__label {
  font-size: 0.75rem;
  opacity: 0.88;
  font-weight: 500;
}

.store-tile__name {
  font-size: 1.1rem;
  font-weight: 700;
}

.store-tile__arrow {
  flex-shrink: 0;
  font-size: 1.25rem;
  opacity: 0.7;
}

.download-landing__note {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--ink-soft);
  text-align: left;
}

.download-footer {
  margin-top: auto;
  padding: 1.5rem 0 max(1.5rem, env(safe-area-inset-bottom, 0px));
  background: var(--ink);
  color: rgba(250, 247, 242, 0.72);
  text-align: center;
}

.download-footer__company {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  color: rgba(250, 247, 242, 0.9);
}

.download-footer__legal {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  line-height: 1.55;
  opacity: 0.85;
}

.download-footer__copy {
  margin: 0;
  font-size: 0.7rem;
  opacity: 0.65;
}

@media (min-width: 520px) {
  .download-landing__lead,
  .download-landing__qr-tip,
  .download-landing__note {
    text-align: center;
  }

  .download-landing__qr-tip code {
    word-break: normal;
  }
}

@media (hover: none) {
  .store-tile:hover {
    transform: none;
  }

  .store-tile:active {
    filter: brightness(1.08);
    transform: scale(0.99);
  }
}

/* 小屏与触控：单列排布、防横向溢出、加大可点区域 */
@media (max-width: 480px) {
  .hero-eyebrow {
    letter-spacing: 0.1em;
    font-size: 0.78rem;
  }

  .hero h1 {
    font-size: clamp(1.75rem, 9vw, 2.35rem);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
    min-height: var(--touch-min);
    box-sizing: border-box;
  }
}

@media (max-width: 767px) {
  .section {
    padding: clamp(2.25rem, 10vw, 3.5rem) 0;
  }

  .section-head {
    margin-bottom: 2rem;
  }

  .card {
    padding: 1.25rem 1.1rem;
  }

  .channel-btn {
    min-height: var(--touch-min);
    box-sizing: border-box;
  }

  .contact-card {
    padding: 1.25rem 1rem;
  }

  .contact-dl dd {
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .contact-dl dd a {
    word-break: break-all;
  }

  .footer-address {
    overflow-wrap: anywhere;
    padding: 0 0.25rem;
  }

  .page-header {
    padding: clamp(1.5rem, 8vw, 2.5rem) 0;
  }

  .page-lead {
    font-size: 1rem;
  }

  .service-list :is(h2, h3) {
    font-size: 1.1rem;
  }

  .footer-nav {
    gap: 0.5rem 0.85rem;
  }

  .footer-nav a {
    display: inline-block;
    padding: 0.4rem 0.15rem;
  }
}