:root {
  --maroon: #7f3033;
  --maroon-dark: #5d2326;
  --maroon-soft: #a95c5f;
  --rose: #f7edec;
  --rose-deep: #efdddc;
  --paper: #fffbfa;
  --bg: #f7f1f1;
  --white: #ffffff;
  --ink: #221f1f;
  --gray: #5f5a59;
  --line: rgba(127, 48, 51, 0.16);
  --pink: #ee84b2;
  --peach: #f4aa8a;
  --mint: #7bc8bd;
  --sky: #97cef0;
  --lime: #c4d06d;
  --radius: 8px;
  --radius-pill: 100vw;
  --font-latin: "Montserrat", var(--font-cn);
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-soft: 0 2px 6px rgba(93, 35, 38, 0.05), 0 12px 28px rgba(93, 35, 38, 0.07);
  --shadow-lift: 0 6px 14px rgba(93, 35, 38, 0.08), 0 24px 48px rgba(93, 35, 38, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

img,
svg {
  display: block;
}

img {
  outline: 1px solid rgba(0, 0, 0, 0.1);
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

@media (min-width: 900px) {
  .container {
    padding-left: 48px;
    padding-right: 48px;
  }
}

.section {
  padding: 80px 0;
  scroll-margin-top: 84px;
}

.section-rose {
  background: var(--bg);
}

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

@media (min-width: 900px) {
  .section {
    padding: 112px 0;
  }
}

.section-head {
  max-width: 760px;
  margin-bottom: 44px;
}

.section-head h2 {
  margin: 0 0 14px;
  color: var(--ink);
  font-family: var(--font-cn);
  font-size: 36px;
  font-weight: 900;
  line-height: 1.35;
  text-wrap: balance;
}

.eyebrow,
.hero-eyebrow {
  margin: 0 0 10px;
  color: var(--maroon);
  font-family: var(--font-latin);
  font-size: 12px;
  font-weight: 700;
}

.section-lead {
  margin: 0;
  color: var(--gray);
  font-size: 17px;
}

h3 {
  margin: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  color: var(--ink);
  font-size: 19px;
  font-weight: 900;
  text-decoration: none;
}

.plan-badge {
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--maroon);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.nav-desktop {
  display: flex;
  gap: 26px;
}

.nav-desktop a {
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav-desktop a:hover {
  color: var(--maroon);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.mobile-menu {
  display: none;
  padding: 8px 24px 16px;
  background: #fff;
  border-top: 1px solid var(--line);
}

.mobile-menu.is-open {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.mobile-menu a:last-child {
  border-bottom: 0;
}

@media (max-width: 860px) {
  .nav-desktop {
    display: none;
  }

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
  padding: 0 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: none;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition-property: transform, background-color, color, border-color, box-shadow;
  transition-duration: 0.18s;
  transition-timing-function: ease-out;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--maroon);
  color: #fff;
  box-shadow: 0 6px 16px rgba(127, 48, 51, 0.24);
}

.btn-primary:hover {
  background: var(--maroon-dark);
}

.btn-secondary {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.btn-secondary:hover {
  border-color: var(--maroon);
  color: var(--maroon);
}

.btn-copy {
  min-height: 44px;
  padding: 0 18px;
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
  font-size: 14px;
}

a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible {
  outline: 3px solid rgba(127, 48, 51, 0.32);
  outline-offset: 2px;
}

/* Hero */
.hero {
  padding: 72px 0;
  background: var(--white);
}

.hero-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
  }
}

.hero-badge {
  display: inline-flex;
  margin-bottom: 16px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--rose);
  color: var(--maroon-dark);
  font-size: 13px;
  font-weight: 700;
}

.hero h1 {
  margin: 0 0 16px;
  color: var(--ink);
  font-size: 56px;
  font-weight: 900;
  line-height: 1.18;
  text-wrap: balance;
}

.hero-lead {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.5;
}

.hero-sub {
  max-width: 620px;
  margin: 0 0 28px;
  color: var(--gray);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Hero gallery */
.hero-gallery {
  width: 100%;
}

.gallery-window {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: var(--shadow-lift);
}

.gallery-track {
  display: flex;
  width: 300%;
  transition: transform 0.45s ease-out;
}

.gallery-slide {
  position: relative;
  width: 33.3333%;
  flex: none;
  margin: 0;
}

.gallery-slide img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.gallery-slide figcaption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  margin: 0;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
}

.gallery-btn {
  position: absolute;
  top: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(34, 34, 34, 0.16);
  transform: translateY(-50%);
  transition: background-color 0.18s ease, color 0.18s ease;
}

.gallery-btn:hover {
  background: var(--maroon);
  color: #fff;
}

.gallery-prev {
  left: 14px;
}

.gallery-next {
  right: 14px;
}

.gallery-dots {
  position: absolute;
  left: 50%;
  bottom: 14px;
  display: flex;
  gap: 8px;
  transform: translateX(-50%);
}

.gallery-dot {
  width: 9px;
  height: 9px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: background-color 0.2s ease, width 0.2s ease;
}

.gallery-dot.is-active {
  width: 26px;
  background: var(--maroon);
}

@media (max-width: 860px) {
  .hero {
    padding: 48px 0 64px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-lead {
    font-size: 18px;
  }
}

/* Background image sections */
.bg-section {
  position: relative;
  isolation: isolate;
  background-position: center;
  background-size: cover;
}

.bg-2 {
  background-image: url("assets/bg-2.jpg");
}

.bg-3 {
  background-image: url("assets/bg-3.jpg");
}

.bg-4 {
  background-image: url("assets/bg-4.jpg");
}

.bg-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(245, 247, 245, 0.94);
}

.bg-section > .container {
  position: relative;
  z-index: 1;
}

/* Panels and cards */
.panel {
  padding: 28px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

/* Background and pain points */
.background-grid {
  display: grid;
  gap: 32px;
}

@media (min-width: 900px) {
  .background-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }
}

.background-copy h3,
.pain-list h3 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 900;
}

.background-copy p {
  margin: 0 0 14px;
  color: var(--gray);
  text-wrap: pretty;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--maroon);
  font-weight: 700;
  text-decoration: none;
}

.text-link:hover {
  color: var(--maroon-dark);
}

.pain-item {
  overflow: hidden;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.pain-item + .pain-item {
  margin-top: 12px;
}

.pain-toggle {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 56px;
  padding: 10px 16px;
  border: 0;
  background: none;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.pain-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-pill);
  background: var(--rose);
  color: var(--maroon-dark);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.pain-title {
  font-size: 15px;
  font-weight: 700;
}

.pain-arrow {
  color: var(--maroon);
  transition-property: transform;
  transition-duration: 0.2s;
  transition-timing-function: ease-out;
}

.pain-item.is-open .pain-arrow {
  transform: rotate(180deg);
}

.pain-panel {
  display: none;
  padding: 0 16px 16px 60px;
  color: var(--gray);
  font-size: 15px;
}

.pain-panel p {
  margin: 0;
}

.pain-item.is-open .pain-panel {
  display: block;
}

/* Cases */
.case-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 760px) {
  .case-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.case-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition-property: transform, box-shadow;
  transition-duration: 0.22s;
  transition-timing-function: ease-out;
}

.case-card:hover,
.case-card:focus-visible {
  box-shadow: var(--shadow-lift);
  transform: translateY(-5px);
}

.case-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.case-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  padding: 20px;
}

.case-tag {
  align-self: flex-start;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--rose);
  color: var(--maroon-dark);
  font-size: 13px;
  font-weight: 700;
}

.case-card h3 {
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.45;
  text-wrap: balance;
}

.case-summary {
  margin: 0;
  color: var(--gray);
  font-size: 15px;
}

.case-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  color: var(--maroon);
  font-size: 15px;
  font-weight: 700;
}

.common-point {
  margin-top: 36px;
  padding: 24px 28px;
  border-radius: var(--radius);
  background: var(--rose);
}

.common-point p {
  margin: 0;
  color: var(--ink);
  text-wrap: pretty;
}

.common-point strong {
  display: block;
  margin-bottom: 4px;
  color: var(--maroon-dark);
}

/* Tabs */
.tabs {
  display: inline-flex;
  gap: 4px;
  padding: 5px;
  border-radius: var(--radius-pill);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.tab-btn {
  min-height: 42px;
  padding: 0 24px;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--gray);
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.tab-btn.is-active {
  background: var(--maroon);
  color: #fff;
}

.tab-panel {
  margin-top: 24px;
}

.point-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.point-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.point-list li p {
  margin: 0;
  color: var(--gray);
  font-size: 15px;
  text-wrap: pretty;
}

.point-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  color: #fff;
}

.point-list-adv .point-icon {
  background: var(--maroon);
}

.point-list-risk .point-icon {
  background: var(--peach);
}

/* Dialogue */
.dialogue {
  margin-top: 48px;
  padding: 28px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.dialogue-head {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 19px;
  font-weight: 900;
}

.dialogue-head .icon {
  width: 22px;
  height: 22px;
  color: var(--maroon);
}

.dialogue-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.bubble {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  max-width: 680px;
}

.bubble-right {
  flex-direction: row-reverse;
  margin-left: auto;
}

.bubble-name {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

.bubble-ai .bubble-name {
  background: var(--maroon);
}

.bubble-teacher .bubble-name {
  background: var(--maroon-dark);
}

.bubble-parent .bubble-name {
  background: var(--pink);
}

.bubble p {
  margin: 0;
  padding: 12px 16px;
  border-radius: var(--radius);
  background: var(--bg);
  font-size: 15px;
  text-wrap: pretty;
}

.dialogue-summary {
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  color: var(--maroon-dark);
  font-weight: 700;
  text-align: center;
}

/* Development needs */
.need-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 760px) {
  .need-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.need-card {
  padding: 24px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.need-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-bottom: 18px;
  border-radius: var(--radius);
  object-fit: cover;
}

.need-top {
  display: flex;
  align-items: center;
  gap: 14px;
}

.need-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-pill);
  color: #fff;
}

.need-card:nth-child(1) .need-icon {
  background: var(--maroon);
}

.need-card:nth-child(2) .need-icon {
  background: var(--mint);
}

.need-card h3 {
  color: var(--ink);
  font-size: 19px;
  font-weight: 900;
}

.need-short {
  margin: 2px 0 0;
  color: var(--gray);
  font-size: 14px;
}

.need-detail {
  display: none;
  margin: 18px 0 0;
  color: var(--gray);
  text-wrap: pretty;
}

.need-card.is-open .need-detail {
  display: block;
}

.need-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--maroon);
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
}

.need-toggle .icon {
  transition: transform 0.2s ease;
}

.need-card.is-open .need-toggle .icon {
  transform: rotate(180deg);
}

.guide-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--rose);
  color: var(--maroon-dark);
  font-weight: 700;
}

.guide-note .icon {
  width: 22px;
  height: 22px;
}

.guide-note p {
  margin: 0;
}

/* Contact */
.contact-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 320px;
    gap: 56px;
  }
}

.contact-info {
  padding: 30px;
}

.contact-line {
  margin: 0 0 18px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 900;
}

.wechat-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.contact-label {
  color: var(--gray);
  font-weight: 700;
}

.wechat-row code {
  padding: 7px 14px;
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
}

.contact-invite {
  margin: 18px 0 0;
  color: var(--gray);
}

.qr-img {
  display: block;
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1 / 1;
  padding: 12px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
  object-fit: contain;
}

/* Footer */
.site-footer {
  padding: 32px 0;
  background: var(--maroon-dark);
  color: #f7e9e9;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

@media (min-width: 760px) {
  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(93, 35, 38, 0.55);
}

.modal {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - 48px);
  overflow: auto;
  padding: 30px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 24px 60px rgba(93, 35, 38, 0.3);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
}

.modal h3 {
  margin: 6px 0 12px;
  padding-right: 44px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 900;
  line-height: 1.4;
}

.modal-summary {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
}

.modal-detail {
  margin: 0 0 22px;
  color: var(--gray);
}

.modal .btn {
  min-height: 42px;
}

@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;
  }
}