:root {
  /* Apple neutral-grey + blue system */
  --bg: oklch(0.966 0.002 264);          /* #f5f5f7 */
  --surface: oklch(0.98 0.002 264);
  --surface-strong: oklch(0.93 0.003 264);
  --ink: oklch(0.26 0.006 277);          /* #1d1d1f */
  --muted: oklch(0.55 0.006 286);        /* #6e6e73 */
  --line: oklch(0.87 0.003 286);         /* #d2d2d7 */
  --primary: oklch(0.585 0.17 252);      /* #0071e3 */
  --primary-strong: oklch(0.5 0.16 252); /* hover / #0058b0 */
  --primary-soft: oklch(0.93 0.03 252);  /* pastel blue */
  --accent: oklch(0.585 0.17 252);
  --accent-soft: oklch(0.93 0.03 252);
  --warning: oklch(0.6 0.15 45);         /* #bf4800 burnt-orange label */
  --dark: oklch(0.19 0.004 277);         /* near-black #1d1d1f */
  --white: oklch(1 0 0);
  --shadow: 0 24px 70px oklch(0.2 0.004 277 / 0.14);
  --radius: 22px;
  --radius-sm: 16px;
  --radius-lg: 30px;
  --max: 1180px;

  /* Frosted glass material (white on grey) */
  --glass-bg: oklch(1 0 0 / 0.36);
  --glass-bg-strong: oklch(1 0 0 / 0.48);
  --glass-border: oklch(1 0 0 / 0.86);
  --glass-border-shadow: oklch(0.62 0.03 252 / 0.22);
  --glass-blur: blur(34px) saturate(210%);
  --glass-blur-strong: blur(52px) saturate(230%);
  --glass-highlight:
    inset 0 1px 0 oklch(1 0 0 / 0.9),
    inset 0 -1px 0 oklch(0.75 0.02 252 / 0.16);
  --glass-shadow:
    0 22px 70px oklch(0.2 0.004 277 / 0.16),
    0 4px 14px oklch(0.2 0.004 277 / 0.08),
    0 0 0 1px var(--glass-border-shadow),
    inset 0 1px 0 oklch(1 0 0 / 0.86),
    inset 0 -20px 42px oklch(1 0 0 / 0.13);

  /* Dark glass for accent panels */
  --glass-dark-bg: oklch(0.18 0.006 277 / 0.66);
  --glass-dark-border: oklch(1 0 0 / 0.22);
  --glass-dark-shadow:
    0 28px 82px oklch(0.15 0.004 277 / 0.42),
    0 0 0 1px oklch(1 0 0 / 0.08),
    inset 0 1px 0 oklch(1 0 0 / 0.18),
    inset 0 -24px 48px oklch(0.04 0 0 / 0.16);

  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  position: relative;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

/* Very subtle cool wash — Apple-clean grey ground, just enough for glass to read */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(48% 38% at 18% 10%, oklch(0.88 0.07 252 / 0.46) 0, transparent 68%),
    radial-gradient(42% 36% at 88% 2%, oklch(0.92 0.075 210 / 0.34) 0, transparent 66%),
    radial-gradient(38% 42% at 78% 58%, oklch(0.9 0.07 305 / 0.18) 0, transparent 72%),
    linear-gradient(115deg, oklch(1 0 0 / 0.6) 0 16%, transparent 16% 23%, oklch(1 0 0 / 0.32) 23% 36%, transparent 36% 100%),
    linear-gradient(180deg, oklch(0.98 0.004 264) 0, var(--bg) 52%);
}

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

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

code {
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
  padding: 0.1rem 0.32rem;
  font-size: 0.92em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(var(--max), calc(100% - 32px));
  margin: 14px auto 0;
  padding: 10px 10px 10px 14px;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  background: var(--glass-bg-strong);
  box-shadow:
    0 10px 30px oklch(0.2 0.004 277 / 0.10),
    var(--glass-highlight);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.site-header::after,
.hero-panel::after,
.conversion-band::after,
.lead-form::after,
.requirement-table::after,
.compliance-card::after {
  content: "";
  position: absolute;
  pointer-events: none;
  inset: 1px;
  border-radius: inherit;
  background:
    linear-gradient(135deg, oklch(1 0 0 / 0.52) 0, transparent 28%),
    linear-gradient(315deg, oklch(1 0 0 / 0.16) 0, transparent 34%);
  mix-blend-mode: screen;
}

.brand,
.nav-links,
.hero-actions,
.question-strip,
.conversion-band,
.panel-topline,
.window-bar,
.status-grid,
.site-footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.6rem;
  font-weight: 800;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  background: var(--dark);
  color: var(--white);
  font-size: 0.82rem;
  letter-spacing: 0;
}

.nav-links {
  gap: 1.1rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.nav-links a:hover,
.inline-link:hover {
  color: var(--primary-strong);
}

.header-cta {
  border-radius: 999px;
  background: var(--primary);
  color: var(--white);
  padding: 0.62rem 1rem;
  font-weight: 750;
  white-space: nowrap;
}

.section-pad {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(56px, 8vw, 110px) 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(390px, 0.82fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
  padding-top: clamp(20px, 3vw, 44px);
}

.signal {
  display: inline-flex;
  width: fit-content;
  margin: 0 0 1rem;
  border: 1px solid oklch(0.75 0.06 252 / 0.4);
  border-radius: 999px;
  background: oklch(0.93 0.03 252 / 0.65);
  color: var(--primary-strong);
  padding: 0.28rem 0.78rem;
  font-size: 0.88rem;
  font-weight: 800;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight);
}

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

h1 {
  margin-bottom: 1.6rem;
  font-size: clamp(2.9rem, 5.8vw, 4.7rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero-title .line {
  display: block;
}

/* The differentiator word carries the olive "runs locally" accent */
.hero-title .accent {
  color: var(--primary-strong);
  background: linear-gradient(transparent 58%, oklch(0.9 0.045 252 / 0.9) 58%);
  padding: 0 0.08em;
  border-radius: 4px;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4vw, 3.45rem);
  line-height: 1.08;
  letter-spacing: 0;
  text-wrap: balance;
}

h3 {
  margin-bottom: 0.42rem;
  font-size: 1.12rem;
  line-height: 1.3;
}

.hero-lede,
.section-copy p,
.section-heading p,
.wechat-section p,
.feature-main p,
.faq-list p {
  max-width: 68ch;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 2rem 0 1.35rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.76rem 1.18rem;
  cursor: pointer;
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

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

.button.primary {
  background: linear-gradient(180deg, oklch(0.64 0.16 252) 0, var(--primary) 100%);
  color: var(--white);
  box-shadow:
    0 12px 28px oklch(0.585 0.17 252 / 0.32),
    inset 0 1px 0 oklch(1 0 0 / 0.28);
}

.button.secondary {
  border-color: var(--glass-border);
  background: var(--glass-bg-strong);
  color: var(--ink);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight);
}

.button.full {
  width: 100%;
}

.question-strip {
  flex-wrap: wrap;
  gap: 0.55rem;
}

.question-strip span {
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  background: var(--glass-bg);
  color: var(--muted);
  padding: 0.42rem 0.8rem;
  font-size: 0.92rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight);
}

.hero-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--glass-bg-strong);
  box-shadow:
    var(--shadow),
    var(--glass-highlight);
  padding: clamp(16px, 2vw, 22px);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: -18px 20px auto auto;
  width: 38%;
  height: 18px;
  border-radius: 999px;
  background: var(--warning);
}

.workbench-window {
  overflow: hidden;
  border: 1px solid oklch(0.24 0 0);
  border-radius: var(--radius-sm);
  background: var(--dark);
  color: var(--white);
}

.window-bar {
  gap: 0.42rem;
  border-bottom: 1px solid oklch(0.35 0 0);
  padding: 0.72rem 0.82rem;
}

.window-bar span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: oklch(0.66 0.2 25);   /* red */
}

.window-bar span:nth-child(2) {
  background: oklch(0.8 0.15 85);   /* amber */
}

.window-bar span:nth-child(3) {
  background: oklch(0.76 0.18 145); /* green */
}

.window-bar strong {
  margin-left: auto;
  color: oklch(0.82 0 0);
  font-size: 0.82rem;
}

.workbench-body {
  display: grid;
  grid-template-columns: 116px 1fr;
  min-height: 330px;
}

.side-stack {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-right: 1px solid oklch(0.28 0 0);
  padding: 1rem 0.72rem;
}

.side-stack span {
  border-radius: 6px;
  color: oklch(0.75 0 0);
  padding: 0.42rem 0.5rem;
  font-size: 0.84rem;
}

.side-stack .active {
  background: var(--primary);
  color: var(--white);
}

.chat-preview {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1rem;
}

.bubble {
  max-width: 92%;
  border-radius: var(--radius-sm);
  padding: 0.72rem 0.84rem;
  font-size: 0.95rem;
  line-height: 1.45;
}

.bubble.user {
  align-self: flex-end;
  background: var(--accent);
  color: var(--white);
}

.bubble.ai {
  background: oklch(0.23 0 0);
  color: oklch(0.92 0 0);
}

.status-grid {
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.status-grid span {
  border: 1px solid oklch(0.38 0 0);
  border-radius: 999px;
  color: oklch(0.85 0 0);
  padding: 0.34rem 0.58rem;
  font-size: 0.78rem;
}

.panel-topline {
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.panel-topline strong {
  color: var(--ink);
  text-align: right;
}

.inline-link {
  display: inline-flex;
  margin-top: 1rem;
  color: var(--accent);
  font-weight: 800;
}

.conversion-band {
  position: relative;
  overflow: hidden;
  width: min(var(--max), calc(100% - 32px));
  margin: -26px auto 0;
  border: 1px solid var(--glass-dark-border);
  border-radius: var(--radius);
  background: var(--glass-dark-bg);
  color: var(--white);
  box-shadow: var(--glass-dark-shadow);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
}

.conversion-band div {
  flex: 1;
  min-height: 112px;
  padding: 1.25rem;
}

.conversion-band div + div {
  border-left: 1px solid oklch(0.3 0 0);
}

.conversion-band strong,
.conversion-band span {
  display: block;
}

.conversion-band strong {
  margin-bottom: 0.2rem;
  font-size: 1.15rem;
}

.conversion-band span {
  color: oklch(0.78 0 0);
  font-size: 0.92rem;
}

.split-section,
.wechat-section,
.requirements-section {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(360px, 0.72fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.notice {
  display: grid;
  gap: 0.25rem;
  max-width: 560px;
  margin-top: 2rem;
  border: 1px solid oklch(0.78 0.06 70 / 0.5);
  border-radius: var(--radius);
  background: oklch(0.95 0.06 80 / 0.6);
  padding: 1rem 1.15rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight);
}

.notice span {
  color: oklch(0.34 0.04 70);
}

.lead-form,
.compliance-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--glass-bg-strong);
  box-shadow: var(--glass-shadow);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
}

.lead-form {
  display: grid;
  gap: 1rem;
  padding: clamp(18px, 3vw, 28px);
}

.application-card > strong {
  font-size: 1.35rem;
  line-height: 1.25;
}

.application-card > p {
  margin: 0;
  color: var(--muted);
}

.trial-stack {
  display: grid;
  gap: 1rem;
}

.trial-copy p {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.08rem;
}

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

.form-row {
  display: grid;
  gap: 0.42rem;
}

label {
  font-weight: 780;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  background: oklch(1 0 0 / 0.5);
  color: var(--ink);
  padding: 0.82rem 0.9rem;
  outline: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px oklch(0.585 0.17 252 / 0.18);
}

textarea {
  resize: vertical;
}

.form-help {
  margin: -0.25rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.success-box {
  border-radius: var(--radius);
  background: var(--primary-soft);
  color: var(--primary-strong);
  padding: 1rem;
}

.success-box p {
  margin: 0.25rem 0 0;
}

.wechat-section {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.check-list {
  display: grid;
  gap: 0.75rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 1.8rem;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.48rem;
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  background: var(--primary);
}

.section-heading {
  max-width: 840px;
  margin-bottom: 2.2rem;
}

.section-heading.compact {
  max-width: 760px;
}

.process-grid,
.fit-grid,
.compliance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.process-grid article,
.feature-list article,
.fit-grid div,
.faq-list details {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  background: var(--glass-bg);
  box-shadow: var(--glass-shadow);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.process-grid article:hover,
.feature-list article:hover,
.fit-grid div:hover {
  transform: translateY(-3px);
  box-shadow:
    0 18px 44px oklch(0.2 0.004 277 / 0.14),
    var(--glass-highlight);
}

.process-grid article {
  min-height: 220px;
  padding: 1.2rem;
}

.process-grid span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin-bottom: 2rem;
  border-radius: 50%;
  background: var(--dark);
  color: var(--white);
  font-weight: 800;
}

.process-grid p,
.feature-list p,
.fit-grid div,
.requirement-table span,
.compliance-grid p {
  color: var(--muted);
}

.feature-section {
  background: linear-gradient(180deg, transparent 0 13%, oklch(1 0 0 / 0.35) 13% 100%);
}

.feature-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.62fr) 1fr;
  gap: 1rem;
}

.feature-main {
  position: relative;
  min-height: 420px;
  border-radius: var(--radius-lg);
  border: 1px solid oklch(1 0 0 / 0.14);
  background:
    linear-gradient(150deg, oklch(0.62 0.16 252 / 0.95) 0, oklch(0.48 0.16 252 / 0.95) 100%);
  color: var(--white);
  padding: clamp(24px, 4vw, 42px);
  box-shadow:
    0 20px 50px oklch(0.585 0.17 252 / 0.3),
    inset 0 1px 0 oklch(1 0 0 / 0.25);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.feature-main p {
  color: oklch(0.94 0.02 252);
}

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

.feature-list article {
  min-height: 202px;
  padding: 1.2rem;
}

.fit-section {
  padding-top: 76px;
}

.fit-grid div {
  display: flex;
  align-items: center;
  min-height: 86px;
  padding: 1rem;
  font-weight: 760;
}

.requirement-table {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  background: var(--glass-bg-strong);
  box-shadow: var(--glass-shadow);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
}

.requirement-table div {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 1rem;
  padding: 1rem 1.2rem;
}

.requirement-table div + div {
  border-top: 1px solid var(--line);
}

.compliance-card {
  border-color: var(--glass-dark-border);
  background: var(--glass-dark-bg);
  box-shadow: var(--glass-dark-shadow);
  color: var(--white);
  padding: clamp(24px, 5vw, 54px);
}

.compliance-card .signal {
  border-color: oklch(0.38 0 0);
  background: oklch(0.22 0 0);
  color: oklch(0.86 0 0);
}

.compliance-grid p {
  min-height: 82px;
  margin: 0;
  border: 1px solid oklch(1 0 0 / 0.12);
  border-radius: var(--radius-sm);
  background: oklch(1 0 0 / 0.06);
  color: oklch(0.86 0 0);
  padding: 1rem;
}

.faq-list {
  display: grid;
  gap: 0.8rem;
}

.faq-list details {
  padding: 1rem 1.15rem;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 820;
}

.faq-list p {
  margin: 0.8rem 0 0;
}

.site-footer {
  justify-content: space-between;
  gap: 1rem;
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  padding: 28px 0 42px;
  color: var(--muted);
}

.site-footer strong {
  color: var(--ink);
}

@media (max-width: 920px) {
  .site-header {
    border-radius: var(--radius);
    align-items: flex-start;
  }

  .nav-links {
    display: none;
  }

  .hero,
  .split-section,
  .wechat-section,
  .requirements-section,
  .feature-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .conversion-band {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .conversion-band div + div {
    border-left: 0;
    border-top: 1px solid oklch(0.3 0 0);
  }

  .feature-main {
    min-height: 280px;
  }
}

@media (max-width: 640px) {
  body {
    background: var(--bg);
  }

  .site-header {
    width: calc(100% - 20px);
    margin-top: 10px;
  }

  .header-cta {
    display: none;
  }

  .section-pad {
    width: calc(100% - 24px);
    padding: 50px 0;
  }

  h1 {
    font-size: clamp(2.5rem, 12vw, 3.4rem);
  }

  .hero-actions,
  .button,
  .site-footer {
    width: 100%;
  }

  .button {
    min-height: 52px;
  }

  .workbench-body {
    grid-template-columns: 1fr;
  }

  .side-stack {
    flex-direction: row;
    overflow: auto;
    border-right: 0;
    border-bottom: 1px solid oklch(0.28 0 0);
  }

  .conversion-band,
  .form-grid,
  .feature-list {
    grid-template-columns: 1fr;
  }

  .conversion-band div {
    min-height: 88px;
  }

  .requirement-table div {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}