/* Bilzat 官网 · 对齐讯飞同传落地页布局与配色（内容为贝扎特产品） */
:root {
  --blue: #1677ff;
  --blue-deep: #0f5ed7;
  --blue-soft: #e8f3ff;
  --blue-wash: #f0f7ff;
  --ink: #1f2329;
  --muted: #646a73;
  --line: #e5e6eb;
  --card: #ffffff;
  --bg: #f5f8fc;
  --gold: #c2a36b;
  --green: #2db55d;
  --shadow: 0 12px 40px rgba(22, 60, 120, 0.08);
  --radius: 16px;
  --shell: min(1180px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #eaf4ff 0%, #f7fbff 28%, #ffffff 55%);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { max-width: 100%; display: block; }
.shell { width: var(--shell); margin: 0 auto; }

/* —— 顶栏 —— */
.tc-nav {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(229, 230, 235, 0.9);
}
.tc-nav-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.tc-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
  white-space: nowrap;
}
.tc-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--blue), #5eb0ff);
  position: relative;
  flex: 0 0 auto;
}
.tc-mark::after {
  content: "";
  position: absolute;
  left: 7px; right: 7px; bottom: 8px;
  height: 3px;
  border-radius: 99px;
  background: #fff;
  transform: skewX(-18deg);
}
.tc-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
  justify-content: center;
}
.tc-links a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}
.tc-links a:hover,
.tc-links a.active {
  color: var(--blue);
  background: var(--blue-soft);
}
.tc-nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.tc-nav-right .ghost {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}
.tc-nav-right .user-pill {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  color: var(--muted);
  background: #fff;
}

/* —— Hero —— */
.tc-hero {
  padding: 56px 0 28px;
  text-align: center;
}
.tc-hero .spark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid #d6e8ff;
  color: var(--blue);
  font-size: 13px;
  font-weight: 650;
  margin-bottom: 18px;
}
.tc-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 800;
}
.tc-hero h1 em {
  color: var(--blue);
  font-style: normal;
}
.tc-hero .lead {
  margin: 0 auto 28px;
  max-width: 640px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}
.tc-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 36px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--blue-deep), var(--blue));
  box-shadow: 0 10px 24px rgba(22, 119, 255, 0.28);
}
.btn-primary:hover { box-shadow: 0 14px 28px rgba(22, 119, 255, 0.34); }
.btn-ghost {
  color: var(--ink);
  background: #fff;
  border-color: #d7e3f4;
}
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-gold {
  color: #fff;
  background: linear-gradient(120deg, #b8924f, var(--gold));
}

/* 语言气泡带 */
.lang-rail {
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  margin: 8px 0 36px;
}
.lang-track {
  display: flex;
  gap: 12px;
  width: max-content;
  animation: rail 36s linear infinite;
}
.lang-track span {
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #dce9f8;
  color: #3d4a5c;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 6px 18px rgba(40, 90, 160, 0.06);
}
@keyframes rail {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* 数据条 */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 0 auto 48px;
  max-width: 820px;
}
.stat-row div { text-align: center; }
.stat-row b {
  display: block;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 850;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.stat-row span {
  color: var(--muted);
  font-size: 14px;
}

/* 预览卡 */
.preview-card {
  background: #fff;
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 1px solid #e8eef6;
  overflow: hidden;
  margin-bottom: 64px;
}
.preview-tabs {
  display: flex;
  gap: 8px;
  padding: 16px 18px 0;
  border-bottom: 1px solid var(--line);
  background: #fafcfe;
}
.preview-tabs button {
  border: 0;
  background: transparent;
  padding: 12px 16px;
  color: var(--muted);
  font-weight: 650;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.preview-tabs button.on {
  color: var(--blue);
  border-bottom-color: var(--blue);
}
.preview-body {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
  min-height: 320px;
}
.preview-visual {
  background:
    radial-gradient(600px 280px at 20% 20%, rgba(22, 119, 255, 0.18), transparent 60%),
    linear-gradient(145deg, #0b1b33 0%, #12325a 55%, #1a4f8a 100%);
  color: #e8f2ff;
  padding: 28px;
  display: grid;
  align-content: end;
  gap: 8px;
}
.preview-visual strong { font-size: 22px; letter-spacing: -0.02em; }
.preview-visual p { margin: 0; opacity: 0.78; font-size: 14px; line-height: 1.6; }
.preview-side {
  padding: 28px 24px;
  display: grid;
  gap: 14px;
  align-content: start;
}
.preview-side h3 { margin: 0; font-size: 20px; }
.preview-side p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.65; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip-row span {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue-deep);
  font-size: 12px;
  font-weight: 700;
}

/* 区块通用 */
.sec {
  padding: 56px 0;
}
.sec.alt { background: var(--bg); }
.sec h2 {
  margin: 0 0 10px;
  text-align: center;
  font-size: clamp(24px, 3.5vw, 34px);
  letter-spacing: -0.02em;
}
.sec h2 em { color: var(--blue); font-style: normal; }
.sec h2 .green { color: var(--green); }
.sec .sub {
  margin: 0 auto 32px;
  text-align: center;
  max-width: 640px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

/* 案例卡 */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.case-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #e8eef6;
  box-shadow: 0 10px 28px rgba(30, 70, 130, 0.06);
}
.case-photo {
  height: 160px;
  background-size: cover;
  background-position: center;
}
.case-photo.p1 {
  background-image: linear-gradient(135deg, #9ec5ff, #5b8def);
}
.case-photo.p2 {
  background-image: linear-gradient(135deg, #7ad3c4, #3aa8c5);
}
.case-photo.p3 {
  background-image: linear-gradient(135deg, #c3b4ff, #7a6cf0);
}
.case-body { padding: 16px 18px 20px; }
.case-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 14px;
}
.case-meta b { font-weight: 750; }
.case-meta span { color: var(--blue); font-weight: 650; }
.case-body p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}
.more-link {
  display: inline-flex;
  margin: 22px auto 0;
  color: var(--blue);
  font-weight: 700;
  font-size: 14px;
}
.sec .more-wrap { text-align: center; }

/* 产品 tabs */
.prod-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 22px;
}
.prod-tabs button {
  border: 0;
  background: transparent;
  padding: 10px 18px;
  border-radius: 999px;
  color: var(--ink);
  font-weight: 650;
  cursor: pointer;
}
.prod-tabs button.on {
  background: var(--blue-soft);
  color: var(--blue);
}
.prod-panel {
  background: #0f1c2e;
  border-radius: 20px;
  min-height: 280px;
  padding: 36px;
  color: #eaf2ff;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: center;
  box-shadow: var(--shadow);
}
.prod-panel h3 { margin: 0 0 10px; font-size: 26px; }
.prod-panel p { margin: 0 0 18px; opacity: 0.82; line-height: 1.7; }
.prod-panel .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.prod-panel .meta span {
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 12px;
}
.prod-panel .mock {
  border-radius: 14px;
  background: linear-gradient(160deg, rgba(255,255,255,.12), rgba(255,255,255,.04));
  border: 1px solid rgba(255,255,255,.14);
  min-height: 180px;
  padding: 18px;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12px;
  line-height: 1.55;
  color: #cfe2ff;
}

/* 双卡 */
.duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.duo-card {
  background: #fff;
  border-radius: 20px;
  border: 1px solid #e8eef6;
  box-shadow: var(--shadow);
  padding: 28px 24px 22px;
  text-align: center;
  display: grid;
  gap: 16px;
  justify-items: center;
}
.duo-card h3 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.02em;
}
.duo-card h3 em { color: var(--blue); font-style: normal; }
.duo-mock {
  width: 100%;
  border-radius: 14px;
  min-height: 180px;
  background: linear-gradient(180deg, #f4f8ff, #e8f1ff);
  border: 1px solid #dce8f8;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 13px;
  padding: 16px;
  text-align: left;
  line-height: 1.6;
}
.duo-mock.vip {
  background:
    linear-gradient(160deg, rgba(15, 30, 55, 0.92), rgba(30, 55, 95, 0.88)),
    #123;
  color: #e7efff;
  border-color: transparent;
}
.duo-card .foot-link {
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

/* 安全 */
.sec-safe { background: #f3f7f6; }
.safe-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}
.safe-col { display: grid; gap: 16px; }
.safe-card {
  background: #fff;
  border-radius: 16px;
  padding: 22px 20px;
  box-shadow: 0 8px 24px rgba(20, 50, 40, 0.05);
  border: 1px solid rgba(220, 230, 228, 0.9);
}
.safe-card h4 { margin: 0 0 8px; font-size: 17px; }
.safe-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.safe-card .ico {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 12px;
  background: var(--blue-soft);
  color: var(--blue);
  font-weight: 850;
  font-size: 13px;
}
.safe-card a {
  display: inline-block;
  margin-top: 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

/* 底栏 CTA */
.sticky-cta {
  position: sticky;
  bottom: 0;
  z-index: 40;
  background: rgba(232, 243, 255, 0.96);
  border-top: 1px solid #d6e8ff;
  backdrop-filter: blur(10px);
}
.sticky-cta-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 0;
}
.sticky-cta p { margin: 0; color: #35557a; font-size: 14px; font-weight: 650; }

/* Footer 深色 */
.tc-footer {
  background: #1a1d24;
  color: #c9ced6;
  padding: 48px 0 0;
}
.tc-footer a { color: #c9ced6; }
.tc-footer a:hover { color: #fff; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr 0.8fr 1fr;
  gap: 28px;
  padding-bottom: 36px;
}
.foot-grid h4 {
  margin: 0 0 14px;
  color: #fff;
  font-size: 14px;
}
.foot-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 13px;
}
.foot-grid .hi { color: var(--blue); }
.foot-contact p { margin: 0 0 8px; font-size: 13px; line-height: 1.6; }
.foot-qrs {
  display: flex;
  gap: 14px;
}
.foot-qrs figure {
  margin: 0;
  text-align: center;
}
.foot-qrs img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  border-radius: 8px;
  background: #fff;
  padding: 4px;
}
.foot-qrs figcaption {
  margin-top: 6px;
  font-size: 12px;
  color: #9aa3b2;
}
.foot-bottom {
  border-top: 1px solid #2a2f38;
  background: #22262e;
  padding: 14px 0 18px;
  font-size: 12px;
  color: #8b93a1;
}
.foot-bottom .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: space-between;
  align-items: center;
}
.foot-bottom a { color: #8b93a1; }
.foot-bottom a:hover { color: #fff; }

/* 右侧悬浮 */
.float-rail {
  position: fixed;
  right: 16px;
  bottom: 96px;
  z-index: 55;
  display: grid;
  gap: 10px;
}
.float-rail a,
.float-rail button {
  width: 48px;
  height: 48px;
  border-radius: 999px;
  border: 1px solid #d7e3f4;
  background: #fff;
  box-shadow: 0 8px 20px rgba(20, 50, 100, 0.12);
  display: grid;
  place-items: center;
  color: var(--blue);
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}
.float-rail .ent {
  width: auto;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  font-size: 12px;
}

@media (max-width: 960px) {
  .tc-links { display: none; }
  .preview-body,
  .prod-panel,
  .duo,
  .case-grid,
  .safe-grid,
  .foot-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr; gap: 12px; }
  .float-rail { display: none; }
}