:root {
  --accent: #0098f8;
  --accent-2: #0078d4;
  --accent-soft: rgba(0, 152, 248, 0.12);
  --text: #1a1d2e;
  --text-2: #5c6178;
  --text-3: #8b90a5;
  --line: #e5e8f0;
  --bg: #f5f7fb;
  --navy: #071528;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: "PingFang SC", "Noto Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "WenQuanYi Micro Hei", system-ui, sans-serif;
  color: var(--text);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 80;
  padding: 8px 14px;
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font-size: 14px;
  font-weight: 650;
  box-shadow: 0 8px 24px rgba(26, 29, 46, 0.16);
}

.skip:focus { top: 12px; }

.wrap { width: min(1180px, calc(100% - 64px)); margin: 0 auto; }

/* ——— Nav ——— */
.top {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 64px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  flex: 0 0 auto;
}

.brand img { width: 28px; height: 28px; border-radius: 7px; }

.menu {
  display: flex;
  align-items: center;
  gap: 32px;
  color: var(--text-2);
  font-size: 14px;
}

.menu a {
  display: inline-flex;
  align-items: center;
  height: 64px;
}

.menu a:hover { color: var(--accent); }

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 1px;
  background: var(--text);
  position: relative;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  top: 0;
  transform: rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 18px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(0, 152, 248, 0.28);
  transition: background 0.15s;
}

.btn:hover { background: var(--accent-2); }

.btn-lg { height: 44px; padding: 0 28px; font-size: 15px; }

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 28px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.15s;
}

.btn-outline:hover { background: rgba(255, 255, 255, 0.08); }

.hero :focus-visible,
.contact :focus-visible { outline-color: #fff; }

/* ——— Hero ——— */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  padding: 88px 0 96px;
  background:
    radial-gradient(580px 420px at 78% 42%, rgba(0, 152, 248, 0.38), transparent 62%),
    radial-gradient(420px 280px at 62% 70%, rgba(0, 120, 212, 0.18), transparent 70%),
    linear-gradient(125deg, #061321 0%, #0c2444 45%, #0a1c36 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 72% 48%, rgba(0, 152, 248, 0.15) 0%, transparent 42%),
    radial-gradient(circle at 72% 48%, transparent 28%, rgba(0, 152, 248, 0.08) 29%, transparent 42%),
    radial-gradient(circle at 72% 48%, transparent 46%, rgba(0, 152, 248, 0.06) 47%, transparent 58%);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(34px, 3.2vw, 44px);
  line-height: 1.22;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.hero .sub {
  color: rgba(255, 255, 255, 0.78);
  font-size: 16px;
  max-width: 30em;
  margin-bottom: 30px;
}

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

/* ——— Product visuals ——— */
.stage {
  position: relative;
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stage-lite { min-height: 340px; }

.shot {
  position: relative;
  z-index: 2;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.28),
    0 4px 16px rgba(0, 0, 0, 0.12),
    0 0 0 1px rgba(255, 255, 255, 0.12);
}

.shot img { width: 100%; height: auto; display: block; }

.shot-lite {
  box-shadow:
    0 18px 48px rgba(26, 29, 46, 0.12),
    0 2px 8px rgba(26, 29, 46, 0.06),
    0 0 0 1px rgba(229, 232, 240, 0.95);
}

.shot-tilt { transform: perspective(1400px) rotateY(-2deg) rotateX(0.6deg); }
.shot-tilt-r { transform: perspective(1400px) rotateY(2deg) rotateX(0.5deg); }

.glow {
  position: absolute;
  z-index: 0;
  pointer-events: none;
  width: 78%;
  height: 70%;
  left: 12%;
  top: 12%;
  background: radial-gradient(ellipse at center, rgba(0, 152, 248, 0.45), transparent 68%);
  filter: blur(8px);
}

.glow-soft {
  background: radial-gradient(ellipse at center, rgba(0, 152, 248, 0.22), transparent 70%);
}

.float-ico {
  position: absolute;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(145deg, #1aadff, #0098f8 55%, #0078d4);
  box-shadow: 0 10px 24px rgba(0, 152, 248, 0.45), 0 2px 6px rgba(0, 0, 0, 0.12);
  display: grid;
  place-items: center;
  z-index: 5;
}

.float-ico svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.float-ico.sm { width: 42px; height: 42px; }
.float-ico.sm svg { width: 20px; height: 20px; }

.hero-frame {
  position: relative;
  width: min(540px, 94%);
  z-index: 2;
}

.float-sun { top: -34px; right: 10px; }
.float-mic { bottom: 10px; left: -22px; }
.float-chat { top: 8px; right: 18px; }
.float-check { top: 16px; left: 8px; }
.float-book { bottom: 24px; left: 12px; }
.float-lock { top: 10px; right: 22px; }

.hero-stage { min-height: 420px; }
.hero-main { width: 100%; max-width: none; }

.hero-side {
  position: absolute;
  width: 198px;
  right: -16px;
  bottom: -4px;
  z-index: 3;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.18);
  transform: rotate(1.5deg);
  background: #fff;
}

.hero-side img { width: 100%; display: block; }

.chip-out {
  position: absolute;
  z-index: 4;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 12px;
  padding: 10px 12px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.5);
  font-size: 12px;
  color: var(--text);
  font-weight: 650;
}

.chip-out .k {
  font-size: 11px;
  color: var(--text-3);
  font-weight: 500;
  margin-bottom: 2px;
}

.chip-live { left: -6px; top: -42px; width: auto; white-space: nowrap; }
.chip-insight { left: 8px; bottom: 28px; }
.chip-bilingual { right: 4px; top: 36px; }

.pill {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 650;
}

/* ——— Features ——— */
.feat { padding: 92px 0; }
.feat.alt { background: var(--bg); }

.feat-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}

.feat-grid.reverse .copy { order: 2; }
.feat-grid.reverse .visual-slot { order: 1; }

.tag {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.feat h2 {
  font-size: 32px;
  line-height: 1.28;
  margin-bottom: 14px;
  font-weight: 700;
}

.feat .lead {
  color: var(--text-2);
  font-size: 16px;
  margin-bottom: 18px;
  max-width: 32em;
}

.lines { list-style: none; display: grid; gap: 12px; }

.lines li {
  color: var(--text-2);
  font-size: 15px;
  padding-left: 14px;
  border-left: 3px solid var(--accent-soft);
}

.lines strong { color: var(--text); font-weight: 650; }

.visual-slot { position: relative; }

.feat-shot { width: 90%; max-width: 500px; margin: 0 auto; }
.feat-shot.wide { max-width: 540px; }

.caption-chips {
  position: absolute;
  z-index: 4;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chips-deploy { left: 0; bottom: 28px; }

#private .stage { justify-content: flex-end; }
#private .feat-shot { width: 76%; max-width: 440px; margin: 0; }

.caption-chips span {
  display: inline-flex;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 650;
  color: var(--text);
  box-shadow: 0 10px 24px rgba(26, 29, 46, 0.1);
}

.caption-chips em {
  font-style: normal;
  color: var(--accent);
  margin-right: 6px;
}

/* ——— Why ——— */
.why { padding: 72px 0 36px; text-align: center; background: var(--bg); }
.why h2 { font-size: 28px; margin-bottom: 36px; font-weight: 700; }

.why-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  text-align: left;
}

.why-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px 22px;
  box-shadow: 0 4px 16px rgba(26, 29, 46, 0.04);
}

.why-card .n {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-weight: 700;
  margin-bottom: 14px;
  font-size: 13px;
}

.why-card h3 { font-size: 17px; margin-bottom: 8px; }
.why-card p { color: var(--text-2); font-size: 14px; }

/* ——— Contact ——— */
.contact {
  margin: 48px 0 72px;
  background:
    radial-gradient(420px 180px at 90% 50%, rgba(0, 152, 248, 0.28), transparent 70%),
    linear-gradient(120deg, #0b1b33, #123056);
  border-radius: 14px;
  padding: 40px 44px;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 20px;
}

.contact h2 { font-size: 24px; margin-bottom: 6px; font-weight: 700; }
.contact p { color: rgba(255, 255, 255, 0.72); font-size: 14px; }

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
}

.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.78);
}

.contact-form input,
.contact-form textarea {
  font: inherit;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  padding: 10px 12px;
}

.contact-form textarea {
  resize: vertical;
  min-height: 88px;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder { color: rgba(255, 255, 255, 0.4); }

.contact-form .span { grid-column: 1 / -1; }

.contact-submit {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.contact-form button:disabled { opacity: 0.55; cursor: not-allowed; }

.form-status { min-height: 1.4em; }
.form-status.is-error { color: #ffd2d2; }
.form-status.is-ok { color: #d8ffe8; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--text-3);
  font-size: 13px;
}

.foot-grid {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  align-items: center;
}

.brand-sm { font-size: 15px; color: var(--text-2); }
.brand-sm img { width: 22px; height: 22px; border-radius: 6px; }

@media (max-width: 920px) {
  .wrap { width: min(1180px, calc(100% - 40px)); }

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

  .menu {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 20px 12px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 40px rgba(7, 21, 40, 0.08);
    color: var(--text);
    font-size: 15px;
  }

  .menu.is-open { display: flex; }

  .menu a {
    height: auto;
    padding: 14px 2px;
    border-bottom: 1px solid var(--line);
  }

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

  .menu a:focus-visible {
    outline: none;
    background: var(--accent-soft);
    border-radius: 8px;
  }

  .hero { padding: 56px 0 64px; }
  .hero-grid,
  .feat-grid,
  .why-grid { grid-template-columns: 1fr; }

  .feat-grid.reverse .copy,
  .feat-grid.reverse .visual-slot { order: initial; }

  .hero-side,
  .chip-out,
  .caption-chips,
  .float-ico { display: none; }

  .hero-frame { width: 100%; }
  .hero-main,
  .feat-shot,
  #private .feat-shot { width: 100%; max-width: 560px; margin: 0 auto; }

  .shot-tilt,
  .shot-tilt-r { transform: none; }

  .hero-stage,
  .stage,
  .stage-lite { min-height: 0; }

  .feat { padding: 56px 0; }
  .feat h2 { font-size: 26px; }
  .why { padding: 48px 0 20px; }
  .why h2 { font-size: 24px; margin-bottom: 22px; }
  .contact { margin: 32px 0 48px; padding: 28px 22px; }
  .contact-form { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 30px; }
  .top .btn { padding: 0 12px; }
  .btn-lg,
  .btn-outline { padding: 0 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .btn,
  .btn-outline,
  .nav-toggle-bars,
  .nav-toggle-bars::before,
  .nav-toggle-bars::after { transition: none; }

  .shot-tilt,
  .shot-tilt-r,
  .hero-side { transform: none; }
}