:root {
  --bg: #f6f6f4;
  --surface: #ffffff;
  --ink: #202020;
  --muted: #6b6b68;
  --line: #deded9;
  --brand: #d24726;
  --brand-dark: #a83219;
  --brand-soft: #fff1eb;
  --green: #14775d;
  --green-soft: #eaf6f1;
  --red: #b42318;
  --red-soft: #fff0ed;
  --radius: 10px;
  font-family: Aptos, "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

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

button, input, textarea, select { font: inherit; }

.page {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.shell {
  width: min(1080px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 750;
}

.brand img { width: 32px; height: 32px; border-radius: 7px; }

.header-actions, nav { display: flex; align-items: center; gap: 18px; }

nav { color: var(--muted); font-size: 14px; font-weight: 650; }

nav a:hover { color: var(--ink); }

.language-select {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  padding: 5px 9px;
  font-size: 13px;
}

.language-select:focus-visible,
.button:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(210, 71, 38, 0.18);
  outline-offset: 2px;
}

.hero {
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .86fr) minmax(460px, 1.14fr);
  align-items: center;
  gap: 64px;
  padding-block: 72px;
}

.hero-copy h1,
.support-intro h1 {
  margin: 0;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -.035em;
}

.lead {
  max-width: 560px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 0;
  border-radius: 7px;
  padding: 0 20px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 750;
}

.hero-copy .button { margin-top: 28px; }

.button.primary { background: var(--brand); color: #fff; }
.button.primary:hover { background: var(--brand-dark); }
.button:disabled { cursor: wait; opacity: .65; }

.slide-stage {
  border-radius: 12px;
  background: #ececeb;
  padding: 18px;
  box-shadow: 0 18px 50px rgba(31, 31, 31, .12);
}

.slide-canvas {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #fffdfa;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .08);
  padding: 6.5% 7%;
}

.slide-accent {
  position: absolute;
  inset: 0 auto 0 0;
  width: 2.4%;
  background: var(--brand);
}

.slide-topline,
.slide-footer {
  display: flex;
  justify-content: space-between;
  color: #77736d;
  font-size: clamp(7px, .78vw, 10px);
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.slide-content {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 7%;
  align-items: end;
  height: 75%;
}

.slide-copy h2 {
  margin: 0;
  font-size: clamp(24px, 3.1vw, 42px);
  line-height: 1.04;
  letter-spacing: -.04em;
}

.slide-copy p {
  margin: 10px 0 0;
  color: #77736d;
  font-size: clamp(8px, .92vw, 12px);
  line-height: 1.55;
}

.slide-metric { display: flex; align-items: baseline; gap: 8px; margin-top: 14px; }
.slide-metric strong { color: var(--brand); font-size: clamp(20px, 2.6vw, 34px); }
.slide-metric span { color: #77736d; font-size: clamp(7px, .8vw, 10px); }

.slide-chart {
  position: relative;
  height: 80%;
  display: flex;
  align-items: end;
  gap: 9%;
  border-bottom: 1px solid #cfcac3;
  padding: 0 7% 18px;
}

.chart-grid {
  position: absolute;
  inset: 0 0 18px;
  background: repeating-linear-gradient(to top, transparent 0, transparent 24%, #ebe7e1 25%);
}

.bar { position: relative; z-index: 1; flex: 1; background: #2e3942; }
.bar-a { height: 31%; opacity: .45; }
.bar-b { height: 48%; opacity: .6; }
.bar-c { height: 66%; opacity: .78; }
.bar-d { height: 88%; background: var(--brand); }
.bar span { position: absolute; top: calc(100% + 6px); left: 50%; transform: translateX(-50%); color: #77736d; font-size: clamp(6px, .65vw, 9px); }

.value-section { padding-block: 64px 76px; }

.value-section > h2 {
  margin: 0 0 24px;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -.025em;
}

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }

.feature {
  min-height: 190px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 24px;
}

.feature-number { color: var(--brand); font-size: 13px; font-weight: 800; }
.feature h3 { margin: 36px 0 8px; font-size: 19px; line-height: 1.3; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.65; }

.support-main {
  display: grid;
  place-items: start center;
  padding-block: 54px 72px;
}

.support-card {
  width: min(100%, 680px);
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  padding: 40px;
}

.support-intro h1 { font-size: clamp(32px, 4vw, 42px); }
.support-intro p { margin: 12px 0 0; color: var(--muted); line-height: 1.6; }
.support-form { display: grid; gap: 20px; margin-top: 32px; }
.field { display: grid; gap: 8px; }
.field label { font-size: 14px; font-weight: 700; }

.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  padding: 11px 12px;
  outline: none;
}

.field input:focus,
.field textarea:focus { border-color: var(--brand); }
.field textarea { min-height: 180px; resize: vertical; line-height: 1.55; }
.submit-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.support-status { display: none; margin: 0; border-radius: 7px; padding: 9px 11px; font-size: 13px; }
.support-status.success { background: var(--green-soft); color: var(--green); }
.support-status.error { background: var(--red-soft); color: var(--red); }

.site-footer {
  min-height: 72px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer a:hover { color: var(--ink); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 42px; padding-block: 52px; }
  .slide-stage { max-width: 680px; width: 100%; }
}

@media (max-width: 660px) {
  .shell { width: min(100% - 28px, 1080px); }
  .site-header { min-height: 64px; }
  .brand span { display: none; }
  .header-actions { gap: 12px; }
  .hero-grid { padding-block: 40px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature { min-height: 150px; }
  .feature h3 { margin-top: 24px; }
  .value-section { padding-block: 44px 56px; }
  .support-main { padding-block: 28px 48px; }
  .support-card { padding: 26px 20px; }
  .submit-row .button { width: 100%; }
}