/* 快提宝 · UI08 教育知识风（循环） */
:root {
  --nav-h: 56px;
  --ktb-primary: #1565C0;
  --ktb-primary2: #0D47A1;
  --ktb-bg: #EEF2FF;
  --ktb-card: #FFFFFF;
  --ktb-ink: #1A237E;
  --ktb-muted: #5C6BC0;
  --ktb-cta: #C62828;
  --ktb-line: rgba(21, 101, 192, 0.12);
}

* { box-sizing: border-box; }
/* 覆盖 Bootstrap Reboot：避免 img 的 height:auto 与横屏裁切冲突 */
img.ktb-media {
  max-width: 100%;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
  display: block;
  vertical-align: middle;
}
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ktb-ink);
  background: var(--ktb-bg);
  line-height: 1.6;
  padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px));
}

.navbar {
  display: block !important;
  padding: 0 !important;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--ktb-line);
  box-shadow: 0 1px 0 rgba(21, 101, 192, 0.06);
}
.nav-inner {
  position: relative;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 18px;
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ktb-primary2);
  text-decoration: none;
  font-weight: 800;
  font-size: 18px;
}
.nav-ic {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--ktb-primary), var(--ktb-primary2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-links {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--ktb-line);
  flex-direction: column;
  padding: 10px 18px 16px;
  gap: 4px;
  z-index: 99;
}
.nav-links.is-open { display: flex; }
.nav-links a {
  color: var(--ktb-ink);
  text-decoration: none;
  font-weight: 600;
  padding: 10px 8px;
  border-radius: 8px;
}
.nav-links a:hover { background: var(--ktb-bg); }
.btn-nav {
  display: none;
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--ktb-cta);
  color: #fff !important;
  font-weight: 700;
  text-decoration: none;
  font-size: 14px;
  margin-left: auto;
}
.nav-toggle {
  margin-left: auto;
  width: 44px;
  height: 44px;
  border: none;
  background: var(--ktb-bg);
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ktb-primary2);
  border-radius: 1px;
}
@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .btn-nav {
    display: inline-block;
    margin-left: auto;
  }
  .nav-links {
    display: flex !important;
    position: static;
    flex-direction: row;
    align-items: center;
    padding: 0;
    border: none;
    flex: 1;
    justify-content: center;
    gap: 6px;
  }
}

/* M1 hero */
.hero { position: relative; }
.hero-content {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center;
  display: block;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(13, 71, 161, 0.82) 0%, rgba(21, 101, 192, 0.55) 45%, rgba(26, 35, 126, 0.75) 100%);
}
/* F2：导航在 hero 之前占流式高度，hero 顶边已在导航下，故 top:0 贴在 hero-content 上沿 */
.compliance-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 10px max(16px, env(safe-area-inset-right, 0px)) 10px max(16px, env(safe-area-inset-left, 0px));
  background: rgba(0, 0, 0, 0.48);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.95);
  font-size: 12px;
  line-height: 1.5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  z-index: 12;
}
.compliance-bar > span {
  flex: 1;
  min-width: 0;
}
.compliance-bar i { color: #FFECB3; margin-right: 6px; flex-shrink: 0; vertical-align: -0.05em; }
.compliance-x {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
  padding: 0 4px;
  flex-shrink: 0;
}
/* 正文上内边距仅避让 F2（导航已在 hero 外），避免重复加 --nav-h */
.hero-body {
  position: relative;
  z-index: 2;
  padding: clamp(56px, 11vh, 96px) 18px 48px;
  max-width: 1140px;
}
@media (min-width: 768px) {
  .hero-body {
    padding-top: clamp(60px, 9vh, 88px);
  }
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.ht {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #fff;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.hero-lead-q {
  color: rgba(255, 255, 255, 0.95);
  font-size: clamp(17px, 3.2vw, 20px);
  font-weight: 700;
  margin: 0 0 8px;
}
.hero-h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 6vw, 46px);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}
.hero-h1 em {
  color: #FFECB3;
  font-style: normal;
}
.hero-sub {
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(14px, 2.8vw, 17px);
  max-width: 36em;
  margin: 0 0 16px;
}
.qa-strip {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
  max-width: 520px;
}
.qa-i {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.95);
}
.qa-a { display: block; margin-top: 4px; opacity: 0.95; }
.hero-card {
  background: rgba(255, 255, 255, 0.96);
  border-radius: 16px;
  padding: 16px 18px;
  max-width: 420px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}
.hc-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}
.hc-badge {
  font-weight: 800;
  color: var(--ktb-primary2);
  font-size: 15px;
}
.hc-badge i { color: var(--ktb-primary); margin-right: 6px; }
.hc-time { font-size: 12px; color: var(--ktb-muted); }
.hc-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--ktb-line);
}
.hc-row:first-of-type { border-top: none; }
.hc-lab {
  width: 44px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ktb-muted);
  flex-shrink: 0;
}
.hc-val {
  flex: 1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-weight: 700;
  color: var(--ktb-ink);
}
.hc-tel { color: var(--ktb-primary2); text-decoration: none; }
.hc-btn {
  border: none;
  background: var(--ktb-cta);
  color: #fff !important;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 22px;
}
.hs-item .hs-n {
  font-size: 24px;
  font-weight: 800;
  color: #fff;
}
.hs-item .hs-l { font-size: 12px; color: rgba(255, 255, 255, 0.75); }

.section { padding: 56px 18px; position: relative; }
.container { max-width: 1140px; margin: 0 auto; }
.sec-t { text-align: center; margin-bottom: 28px; }
.sec-t.al-left { text-align: left; }
.sec-t h2 {
  margin: 0 0 8px;
  font-size: clamp(22px, 4vw, 30px);
  color: var(--ktb-primary2);
}
.sec-t h2 em { color: var(--ktb-primary); font-style: normal; }
.sec-d { margin: 0; color: var(--ktb-muted); font-size: 15px; }

.sec-cond { background: var(--ktb-card); }
.cond-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}
@media (min-width: 768px) {
  .cond-grid { grid-template-columns: 1fr 1fr; }
}
.cond-list {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}
.cond-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
  font-size: 15px;
}
.cond-list i { color: var(--ktb-primary); margin-top: 4px; }
.cond-img img {
  border-radius: 14px;
  border: 1px solid var(--ktb-line);
}
.btn-main {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  background: var(--ktb-primary);
  color: #fff !important;
  font-weight: 700;
  text-decoration: none;
}
.btn-main:hover { background: var(--ktb-primary2); }

.sec-svc { background: var(--ktb-bg); }
.table-wrap {
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid var(--ktb-line);
  background: var(--ktb-card);
}
.svc-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}
.svc-table th,
.svc-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--ktb-line);
  font-size: 14px;
  vertical-align: middle;
}
.svc-table th {
  background: var(--ktb-bg);
  font-weight: 800;
  color: var(--ktb-primary2);
}
.svc-table tr:last-child td { border-bottom: none; }
.row-hot { background: rgba(255, 243, 224, 0.5); }
.pin {
  display: inline-block;
  margin-left: 8px;
  font-size: 11px;
  background: var(--ktb-cta);
  color: #fff;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 700;
  vertical-align: middle;
}
.td-img {
  width: 92px;
  vertical-align: middle;
}
.td-img img {
  width: 80px;
  max-width: 80px;
  height: auto;
  aspect-ratio: 4/3;
  object-fit: cover;
  object-position: center;
  border-radius: 8px;
  display: block;
}
.lbl {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--ktb-bg);
  font-size: 12px;
  font-weight: 700;
  color: var(--ktb-primary2);
}
.lbl-hot { background: #FFEBEE; color: var(--ktb-cta); }
.lbl-ok { background: #E8F5E9; color: #2E7D32; }
.td-go {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--ktb-primary);
  color: #fff !important;
  font-weight: 700;
  font-size: 12px;
  text-decoration: none;
  white-space: nowrap;
}
.svc-note {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--ktb-muted);
}
.svc-note i { margin-right: 6px; }

.sec-flow { background: var(--ktb-card); }
.flow-4 {
  display: grid;
  gap: 16px;
}
@media (min-width: 768px) {
  .flow-4 { grid-template-columns: repeat(4, 1fr); }
}
.fl {
  background: var(--ktb-bg);
  border-radius: 14px;
  padding: 18px;
  border: 1px solid var(--ktb-line);
}
.fl .fn {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--ktb-primary);
  color: #fff;
  font-weight: 800;
  margin-bottom: 10px;
}
.fl h3 { margin: 0 0 8px; font-size: 16px; color: var(--ktb-primary2); }
.fl p { margin: 0; font-size: 14px; color: #455A64; }

.sec-rev { background: var(--ktb-bg); }
.rev-grid {
  display: grid;
  gap: 16px;
}
@media (min-width: 720px) {
  .rev-grid { grid-template-columns: repeat(2, 1fr); }
}
.rev-card {
  background: var(--ktb-card);
  border-radius: 14px;
  padding: 18px;
  border: 1px solid var(--ktb-line);
}
.rev-h {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
  font-weight: 700;
  color: var(--ktb-primary2);
}
.rev-h em { font-style: normal; font-size: 12px; color: var(--ktb-cta); font-weight: 700; }
.rev-card p { margin: 0; font-size: 14px; color: #37474F; }

.sec-tick { background: var(--ktb-card); }
.ticker {
  overflow: hidden;
  border-radius: 12px;
  background: var(--ktb-bg);
  border: 1px solid var(--ktb-line);
}
.ticker-inner {
  display: flex;
  gap: 28px;
  padding: 14px 0;
  width: max-content;
  animation: kt-tick 38s linear infinite;
}
@keyframes kt-tick {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.tk-item {
  white-space: nowrap;
  font-size: 13px;
  font-weight: 600;
  color: var(--ktb-primary2);
}
.tk-item i { color: var(--ktb-primary); margin-right: 8px; }

.sec-trust { position: relative; padding: 64px 18px; overflow: hidden; }
.trust-bg {
  position: absolute;
  inset: 0;
  background-image: var(--trust-img);
  background-size: cover;
  background-position: center;
}
.trust-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(26, 35, 126, 0.92), rgba(21, 101, 192, 0.78));
}
.trust-inner { position: relative; z-index: 2; }
.sec-t-light h2 { color: #fff; }
.sec-t-light .sec-d { color: rgba(255, 255, 255, 0.85); }
.trust-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.tc {
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 14px;
  padding: 22px 28px;
  text-align: center;
  min-width: 140px;
}
.tc span {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}
.tc small { color: rgba(255, 255, 255, 0.8); font-size: 12px; }

.sec-privacy { background: var(--ktb-card); }
.priv-flex {
  display: grid;
  gap: 24px;
  align-items: center;
}
@media (min-width: 900px) {
  .priv-flex { grid-template-columns: 1fr 1.1fr; }
}
.priv-img img {
  border-radius: 14px;
}
.priv-ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.priv-ul li {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 15px;
}
.priv-ul i { color: var(--ktb-primary); margin-top: 3px; }

.sec-faq { background: var(--ktb-bg); }
.faq-item {
  background: var(--ktb-card);
  border: 1px solid var(--ktb-line);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: none;
  background: none;
  font-size: 15px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  color: var(--ktb-primary2);
}
.faq-q i { transition: transform 0.2s; color: var(--ktb-muted); }
.faq-item.open .faq-q i { transform: rotate(180deg); }
.faq-a {
  display: none;
  padding: 0 16px 14px;
  font-size: 14px;
  color: #455A64;
  border-top: 1px solid var(--ktb-line);
  margin-top: -4px;
  padding-top: 12px;
}
.faq-item.open .faq-a { display: block; }

.sec-dash { background: var(--ktb-card); }
.dash-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 768px) {
  .dash-grid { grid-template-columns: repeat(4, 1fr); }
}
.dg {
  background: var(--ktb-bg);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
  border: 1px solid var(--ktb-line);
}
.dg span { font-size: 26px; font-weight: 800; color: var(--ktb-primary2); display: block; }
.dg small { font-size: 12px; color: var(--ktb-muted); }

.sec-about { background: var(--ktb-bg); }
.about-flex {
  display: grid;
  gap: 24px;
  align-items: center;
}
@media (min-width: 900px) {
  .about-flex { grid-template-columns: 1fr 1fr; }
}
.about-img img {
  border-radius: 14px;
}
.about-p { font-size: 15px; color: #455A64; margin: 0 0 18px; }

.sec-contact { background: var(--ktb-card); }
.contact-card {
  max-width: 520px;
  margin: 0 auto;
  border: 1px solid var(--ktb-line);
  border-radius: 16px;
  padding: 22px;
  background: var(--ktb-bg);
}
.cc-block {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ktb-line);
}
.cc-block:last-of-type { border-bottom: none; }
.cc-label {
  width: 48px;
  font-weight: 800;
  font-size: 13px;
  color: var(--ktb-muted);
}
.cc-val {
  flex: 1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-weight: 700;
}
.cc-tel { color: var(--ktb-primary2); text-decoration: none; }
.cc-btn {
  border: none;
  background: var(--ktb-cta);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
}
.cc-meta {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--ktb-muted);
  text-align: center;
}

.footer {
  padding: 28px 18px 36px;
  background: var(--ktb-primary2);
  color: rgba(255, 255, 255, 0.88);
  font-size: 13px;
  text-align: center;
}
.footer p { margin: 0 0 10px; }
.footer-links a { color: #FFECB3; text-decoration: none; margin: 0 4px; }
.footer-tech { font-size: 12px; opacity: 0.85; margin-top: 12px !important; }

.float-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  display: flex;
  gap: 0;
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--ktb-line);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.float-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  font-weight: 800;
  text-decoration: none;
  font-size: 15px;
}
.float-call {
  background: var(--ktb-bg);
  color: var(--ktb-primary2) !important;
}
.float-wechat {
  background: var(--ktb-primary);
  color: #fff !important;
}

.f4-top {
  position: fixed;
  right: max(14px, env(safe-area-inset-right, 0px));
  bottom: calc(58px + env(safe-area-inset-bottom, 0px));
  z-index: 10050;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  background: var(--ktb-primary2);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
}
.f4-top:hover { background: var(--ktb-primary); }

@media (min-width: 768px) {
  .float-bottom { display: none; }
  body { padding-bottom: 0; }
  .f4-top {
    bottom: max(22px, env(safe-area-inset-bottom, 0px));
    right: max(20px, env(safe-area-inset-right, 0px));
  }
}