:root {
  color-scheme: light;
  --font-body: "Avenir Next", Avenir, "Segoe UI Variable", "Segoe UI", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --font-ui-zh: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Noto Serif CJK SC", serif;
  --color-canvas: #f4f1e8;
  --color-surface: #fffdf8;
  --color-surface-warm: #e8ddc8;
  --color-text: #17203d;
  --color-text-subtle: #596279;
  --color-text-muted: #667085;
  --color-brand-primary: #175cd3;
  --color-brand-primary-deep: #153b82;
  --color-brand-red: #e34d3f;
  --color-brand-yellow: #f3be42;
  --color-brand-green: #368760;
  --color-border: rgba(23, 32, 61, .14);
  --color-border-strong: rgba(23, 32, 61, .24);
  --color-focus: #175cd3;
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --radius-sm: .5rem;
  --radius-md: .75rem;
  --radius-lg: 1.25rem;
  --radius-display: 1.75rem;
  --radius-pill: 999px;
  --shadow-card: 0 1.25rem 3rem rgba(23, 32, 61, .11);
  --ease: cubic-bezier(.2, .7, .2, 1);
  --duration-standard: 240ms;
  --page-max: 1240px;
  --page-inline: clamp(24px, 6.67vw, 96px);
  --control-size: 44px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

@supports not (overflow: clip) {
  body { overflow-x: hidden; }
}

a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

.wrap {
  width: min(calc(100% - (var(--page-inline) * 2)), var(--page-max));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.page-shell { min-height: 100svh; }

.site-header {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
}

.brand,
.language-trigger,
.language-option,
.button {
  min-height: var(--control-size);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -.02em;
}

.brand-mark,
.footer-mark {
  color: var(--color-brand-red);
  font-size: 1.35rem;
  line-height: 1;
}

.language-switcher {
  position: relative;
}

.language-trigger {
  display: inline-flex;
  min-width: 88px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: .65rem .85rem;
  background: rgba(255, 253, 248, .72);
  color: var(--color-text-subtle);
  font-family: var(--font-ui-zh);
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .02em;
  box-shadow: 0 2px 8px rgba(25, 34, 67, .05);
  transition: background-color var(--duration-standard) var(--ease), border-color var(--duration-standard) var(--ease), color var(--duration-standard) var(--ease), transform var(--duration-standard) var(--ease);
}

.language-trigger:hover,
.language-trigger.is-open { border-color: var(--color-brand-primary); color: var(--color-brand-primary-deep); transform: translateY(-1px); }
.language-chevron { font-size: .9rem; line-height: 1; transition: transform var(--duration-standard) var(--ease); }
.language-trigger.is-open .language-chevron { transform: rotate(180deg); }
.language-menu {
  position: absolute;
  z-index: 10;
  top: calc(100% + 8px);
  right: 0;
  display: grid;
  min-width: 132px;
  gap: 2px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}
.language-option {
  width: 100%;
  border: 0;
  border-radius: var(--radius-sm);
  padding: .65rem .75rem;
  background: transparent;
  color: var(--color-text-subtle);
  font-family: var(--font-ui-zh);
  font-size: .75rem;
  text-align: left;
  transition: background-color var(--duration-standard) var(--ease), color var(--duration-standard) var(--ease);
}
.language-option:hover,
.language-option.is-active { background: var(--color-surface-warm); color: var(--color-brand-primary-deep); }

.hero {
  display: grid;
  min-height: min(680px, calc(100svh - 88px));
  grid-template-columns: minmax(0, 1.06fr) minmax(330px, .94fr);
  align-items: center;
  gap: clamp(36px, 7vw, 120px);
  padding-block: clamp(56px, 9vw, 112px) clamp(72px, 10vw, 128px);
}

.hero-copy { position: relative; z-index: 1; }

.eyebrow,
.section-kicker {
  margin: 0 0 var(--space-5);
  color: var(--color-brand-primary);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .13em;
  line-height: 1.5;
  text-transform: uppercase;
}

.eyebrow span { padding-inline: .4rem; color: var(--color-brand-yellow); }

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

h1 {
  max-width: 720px;
  margin-bottom: var(--space-6);
  font-family: var(--font-display);
  font-size: clamp(3rem, 6.2vw, 6.6rem);
  font-weight: 500;
  letter-spacing: -.065em;
  line-height: .98;
}

h1 em {
  color: var(--color-brand-red);
  font-style: normal;
}

.hero-lead {
  max-width: 530px;
  margin-bottom: var(--space-8);
  color: var(--color-text-subtle);
  font-family: var(--font-ui-zh);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: .75rem 1.25rem;
  font-family: var(--font-ui-zh);
  font-size: .82rem;
  font-weight: 800;
  line-height: 1.35;
  transition: background-color var(--duration-standard) var(--ease), border-color var(--duration-standard) var(--ease), color var(--duration-standard) var(--ease), transform var(--duration-standard) var(--ease);
}

.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--color-brand-primary); color: var(--color-surface); }
.button-primary:hover { background: var(--color-brand-primary-deep); }
.button-submit { background: var(--color-text); color: var(--color-surface); white-space: nowrap; }
.button-submit:hover { background: var(--color-brand-primary-deep); }

.quiet-note {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-family: var(--font-ui-zh);
  font-size: .75rem;
}

.quiet-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-brand-yellow);
  box-shadow: 0 0 0 4px rgba(243, 190, 66, .18);
}

.hero-art {
  position: relative;
  min-height: clamp(360px, 42vw, 550px);
  isolation: isolate;
}

.art-orbit,
.art-sun,
.art-window,
.art-label { position: absolute; }

.art-orbit {
  inset: 8% 3% 11% 5%;
  border: 1px solid rgba(23, 92, 211, .25);
  border-radius: 50%;
  transform: rotate(-23deg);
}

.art-orbit-inner {
  inset: 18% 15% 18% 13%;
  border-color: rgba(227, 77, 63, .35);
  transform: rotate(41deg);
}

.art-sun {
  top: 7%;
  right: 17%;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-brand-yellow);
  box-shadow: 0 0 0 13px rgba(243, 190, 66, .14);
}

.art-window {
  inset: 17% 16% 13% 15%;
  overflow: hidden;
  border: 13px solid var(--color-text);
  border-radius: 48% 48% 1.5rem 1.5rem;
  background: #b8d9dd;
  box-shadow: 1.15rem 1.15rem 0 var(--color-brand-red), 0 2rem 4rem rgba(23, 32, 61, .18);
}

.art-window::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(142deg, rgba(255, 253, 248, .35), transparent 40%);
  content: "";
}

.art-star { position: absolute; color: var(--color-surface); }
.art-star-one { top: 17%; left: 19%; font-size: 1.8rem; }
.art-star-two { top: 25%; right: 19%; color: var(--color-brand-yellow); font-size: 1rem; }

.art-cloud {
  position: absolute;
  width: 34%;
  height: 11%;
  border-radius: 50%;
  background: rgba(255, 253, 248, .66);
}

.art-cloud::before,
.art-cloud::after {
  position: absolute;
  bottom: 0;
  border-radius: 50%;
  background: inherit;
  content: "";
}

.art-cloud::before { left: 22%; width: 41%; height: 145%; }
.art-cloud::after { right: 11%; width: 33%; height: 120%; }
.art-cloud-one { top: 37%; left: -5%; }
.art-cloud-two { top: 45%; right: -10%; transform: scale(.72); }

.art-hill { position: absolute; border-radius: 50% 50% 0 0; }
.art-hill-back { right: -14%; bottom: 21%; left: 24%; height: 39%; background: var(--color-brand-green); transform: rotate(-7deg); }
.art-hill-front { right: -16%; bottom: -7%; left: -19%; height: 47%; background: var(--color-brand-primary-deep); transform: rotate(5deg); }

.art-door {
  position: absolute;
  z-index: 2;
  bottom: 0;
  left: 45%;
  width: 20%;
  height: 34%;
  border: 5px solid var(--color-surface);
  border-bottom: 0;
  border-radius: 46% 46% 0 0;
  background: var(--color-brand-yellow);
}

.art-label {
  z-index: 3;
  color: var(--color-text);
  font-size: .62rem;
  font-weight: 800;
  letter-spacing: .08em;
  line-height: 1.5;
  text-transform: uppercase;
}

.art-label-top { top: 1%; left: 4%; }
.art-label-bottom { right: 0; bottom: 0; text-align: right; }

.feedback-section { padding-bottom: clamp(64px, 10vw, 128px); }

.feedback-card {
  display: grid;
  grid-template-columns: minmax(220px, .82fr) minmax(0, 1.18fr);
  gap: clamp(36px, 7vw, 110px);
  padding: clamp(32px, 5vw, 72px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-display);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.feedback-intro h2 {
  max-width: 340px;
  margin-bottom: var(--space-4);
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.4vw, 3.6rem);
  font-weight: 500;
  letter-spacing: -.05em;
  line-height: 1.05;
}

.feedback-intro > p:last-child {
  max-width: 310px;
  margin-bottom: 0;
  color: var(--color-text-subtle);
  font-family: var(--font-ui-zh);
  font-size: .9rem;
  line-height: 1.8;
}

.feedback-form { min-width: 0; }
.feedback-options { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
.interest-panel { display: flex; min-width: 0; flex-direction: column; padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: rgba(255, 253, 248, .48); }
.interest-panel-primary { border-color: rgba(227, 77, 63, .3); }
.interest-heading { display: flex; align-items: center; gap: var(--space-3); min-height: 44px; }
.interest-heading h3 { margin: 0; font-family: var(--font-ui-zh); font-size: .95rem; line-height: 1.35; }
.choice-icon { display: grid; width: 44px; height: 44px; flex: 0 0 auto; place-items: center; border-radius: 50%; background: var(--color-brand-red); color: var(--color-surface); font-size: 1.1rem; }
.interest-description { min-height: 4.8em; margin: var(--space-3) 0 var(--space-4); color: var(--color-text-muted); font-family: var(--font-ui-zh); font-size: .78rem; line-height: 1.65; }
.field-label { display: block; margin-bottom: var(--space-2); color: var(--color-text); font-family: var(--font-ui-zh); font-size: .78rem; font-weight: 700; }
.field-label span { color: var(--color-text-muted); font-weight: 500; }
.email-field input { width: 100%; height: 48px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm); padding: 0 .9rem; background: var(--color-surface); color: var(--color-text); }
.email-field input::placeholder { color: #9aa2b1; }
.email-field input:focus { border-color: var(--color-brand-primary); outline: 3px solid rgba(23, 92, 211, .12); }
.email-note { margin: var(--space-2) 0 0; color: var(--color-text-muted); font-family: var(--font-ui-zh); font-size: .7rem; line-height: 1.55; }
.interest-panel .button { width: 100%; margin-top: auto; }
.interest-panel-primary .button { margin-top: var(--space-5); }

.feedback-status { margin-top: var(--space-5); padding: var(--space-4); border-left: 3px solid var(--color-brand-green); background: rgba(54, 135, 96, .08); color: var(--color-text); font-family: var(--font-ui-zh); font-size: .8rem; line-height: 1.6; }
.feedback-status.is-error { border-left-color: var(--color-brand-red); background: rgba(227, 77, 63, .08); }
.feedback-status.is-info { border-left-color: var(--color-brand-yellow); background: rgba(243, 190, 66, .12); }
.honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-6) var(--space-8);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-ui-zh);
  font-size: .72rem;
  line-height: 1.5;
}

.site-footer p { margin-bottom: 0; }
.footer-mark { margin-right: var(--space-2); font-size: .9rem; }

@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr) minmax(260px, .8fr); gap: 32px; }
  .art-window { inset-inline: 10%; }
  .feedback-card { grid-template-columns: 1fr 1.2fr; gap: 40px; }
}

@media (max-width: 720px) {
  :root { --page-inline: 32px; }
  .site-header { min-height: 72px; }
  .hero { display: block; min-height: 0; padding-block: 56px 72px; }
  h1 { max-width: 560px; font-size: clamp(3.1rem, 14vw, 5rem); }
  .hero-art { min-height: min(440px, 92vw); margin-top: 48px; }
  .art-window { inset: 9% 17% 12% 15%; }
  .feedback-card { display: block; padding: 32px; }
  .feedback-intro { margin-bottom: 32px; }
  .feedback-intro h2 { max-width: 520px; }
  .feedback-intro > p:last-child { max-width: 520px; }
}

@media (max-width: 520px) {
  :root { --page-inline: 24px; }
  .hero { padding-block: 48px 56px; }
  .hero-lead { font-size: .95rem; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: var(--space-4); }
  .hero-art { min-height: 330px; margin-top: 28px; }
  .art-window { border-width: 9px; box-shadow: .75rem .75rem 0 var(--color-brand-red), 0 1.25rem 3rem rgba(23, 32, 61, .18); }
  .art-label { font-size: .5rem; }
  .feedback-card { padding: 24px; border-radius: var(--radius-lg); }
  .feedback-intro h2 { font-size: 2.4rem; }
  .choice-icon { width: 40px; height: 40px; }
  .interest-description { min-height: 0; }
  .button-submit { width: 100%; }
  .site-footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}