/* 百家乐官网 - 全局样式表 */

:root {
  --color-bg: #faf8f4;
  --color-bg-alt: #f1ede4;
  --color-card: #ffffff;
  --color-ink: #2b2b2e;
  --color-ink-soft: #565a5f;
  --color-ink-faint: #85898e;
  --color-border: #e6e1d6;
  --color-cyan: #5fa39a;
  --color-cyan-soft: #e4f1ee;
  --color-blue: #4c6690;
  --color-blue-soft: #e9eef5;
  --color-orange: #d98a4f;
  --color-orange-soft: #faeadb;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 6px 24px rgba(43, 43, 46, 0.06);
  --max-width: 1120px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.85;
  font-size: 16px;
  overflow-x: hidden;
}

img, svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4 {
  line-height: 1.4;
  font-weight: 700;
  color: var(--color-ink);
}

p {
  margin: 0 0 1em;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-ink);
  color: #fff;
  padding: 10px 16px;
  z-index: 999;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 244, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-ink);
}

.brand img {
  width: 34px;
  height: 34px;
}

.brand:hover {
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-ink);
  margin: 0 auto;
}

.nav-list {
  display: flex;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--color-ink-soft);
  font-size: 14.5px;
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-cyan);
  text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 56px 0 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 32px;
  margin: 0 0 20px;
}

.hero .lede {
  font-size: 17px;
  color: var(--color-ink-soft);
  margin-bottom: 14px;
}

.hero .sub {
  color: var(--color-ink-faint);
  font-size: 14.5px;
}

.hero-figure {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.hero-figure figcaption,
figure.diagram figcaption {
  text-align: center;
  color: var(--color-ink-faint);
  font-size: 13px;
  margin-top: 10px;
}

/* ---------- Section ---------- */
.section {
  padding: 46px 0;
  border-top: 1px solid var(--color-border);
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-head {
  margin-bottom: 28px;
}

.section-head .eyebrow {
  display: inline-block;
  color: var(--color-cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.section-head h2 {
  font-size: 25px;
  margin: 0 0 10px;
}

.section-head p {
  color: var(--color-ink-soft);
  max-width: 760px;
}

/* ---------- Cards / grid ---------- */
.grid {
  display: grid;
  gap: 20px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.card p {
  color: var(--color-ink-soft);
  font-size: 14.5px;
  margin-bottom: 0;
}

.pill {
  display: inline-block;
  background: var(--color-cyan-soft);
  color: var(--color-cyan);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 12.5px;
  font-weight: 700;
  margin-bottom: 10px;
}
.pill.blue { background: var(--color-blue-soft); color: var(--color-blue); }
.pill.orange { background: var(--color-orange-soft); color: var(--color-orange); }

/* ---------- Article blocks ---------- */
.article {
  padding: 30px 0;
  border-top: 1px dashed var(--color-border);
}
.article:first-of-type {
  border-top: none;
  padding-top: 0;
}

.article .category {
  color: var(--color-orange);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
  display: block;
}

.article h3 {
  font-size: 20px;
  margin: 0 0 14px;
}

.article h4 {
  font-size: 16.5px;
  margin: 20px 0 8px;
}

.article p {
  color: var(--color-ink-soft);
  font-size: 15.5px;
}

.article-note {
  font-size: 13px;
  color: var(--color-ink-faint);
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-cyan);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  margin: 14px 0;
}

/* ---------- Diagram figure ---------- */
figure.diagram {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 0 0 20px;
}

/* ---------- Summary /回流 list ---------- */
.summary-list {
  display: grid;
  gap: 18px;
}

.summary-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
}

.summary-item h4 {
  margin: 0 0 8px;
  font-size: 16px;
}

.summary-item p {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: 14.5px;
}

/* ---------- Links row ---------- */
.link-row {
  display: grid;
  gap: 14px;
}

.link-card {
  display: block;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  color: var(--color-ink);
  font-size: 14.5px;
}
.link-card:hover {
  border-color: var(--color-cyan);
  text-decoration: none;
}
.link-card strong {
  color: var(--color-blue);
}

/* ---------- Tabs (room / sensor / risk / pet / device demos) ---------- */
.tab-group {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.tab-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-ink-soft);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 13.5px;
  cursor: pointer;
  font-family: var(--font-main);
}

.tab-btn.active {
  background: var(--color-cyan);
  border-color: var(--color-cyan);
  color: #fff;
}

.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

.tab-panel .kv {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 8px 14px;
  font-size: 14.5px;
  margin-bottom: 6px;
}
.tab-panel .kv dt {
  color: var(--color-ink-faint);
}
.tab-panel .kv dd {
  margin: 0;
  color: var(--color-ink);
}

.risk-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}
.risk-low { background: var(--color-cyan-soft); color: var(--color-cyan); }
.risk-mid { background: var(--color-orange-soft); color: var(--color-orange); }
.risk-high { background: #f6dfda; color: #b0533f; }

/* ---------- FAQ ---------- */
.faq-list {
  border-top: 1px solid var(--color-border);
}
.faq-item {
  border-bottom: 1px solid var(--color-border);
}
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 16px 4px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--color-ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: var(--font-main);
}
.faq-q::after {
  content: "+";
  font-size: 20px;
  color: var(--color-cyan);
  flex-shrink: 0;
}
.faq-item.open .faq-q::after {
  content: "−";
}
.faq-a {
  display: none;
  padding: 0 4px 16px;
  color: var(--color-ink-soft);
  font-size: 14.5px;
}
.faq-item.open .faq-a {
  display: block;
}

/* ---------- App interface mock ---------- */
.app-mock {
  background: var(--color-ink);
  border-radius: 26px;
  padding: 16px;
  max-width: 300px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}
.app-mock-screen {
  background: var(--color-card);
  border-radius: 16px;
  padding: 16px;
  min-height: 400px;
}
.app-mock-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 13.5px;
}
.app-mock-row:last-child { border-bottom: none; }
.app-mock-status {
  font-weight: 700;
  color: var(--color-cyan);
}

/* ---------- Boundary / disclaimer box ---------- */
.boundary-box {
  background: var(--color-blue-soft);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-ink-soft);
  margin: 20px 0;
}
.boundary-box strong {
  color: var(--color-blue);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: #cfd1d4;
  padding: 44px 0 24px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 30px;
}
.footer-col h5 {
  color: #fff;
  font-size: 14px;
  margin: 0 0 12px;
}
.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-col li {
  margin-bottom: 8px;
}
.footer-col a {
  color: #aeb1b6;
  font-size: 13.5px;
}
.footer-col a:hover {
  color: #fff;
}
.footer-brand p {
  color: #9a9da2;
  font-size: 13.5px;
}
.footer-bottom {
  border-top: 1px solid #45464a;
  padding-top: 18px;
  color: #8b8e93;
  font-size: 12.5px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-content: space-between;
}

/* ---------- Back to top ---------- */
.back-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-cyan);
  color: #fff;
  border: none;
  font-size: 18px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  z-index: 90;
}
.back-top.show {
  display: flex;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  font-size: 13px;
  color: var(--color-ink-faint);
  padding: 14px 0 0;
}
.breadcrumb a {
  color: var(--color-ink-faint);
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-list {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-list.open {
    max-height: 520px;
  }
  .nav-list li {
    border-top: 1px solid var(--color-border);
  }
  .nav-list a {
    display: block;
    padding: 14px 20px;
  }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 26px; }
  .tab-panel .kv { grid-template-columns: 110px 1fr; }
}

@media (max-width: 430px) {
  .section { padding: 34px 0; }
  .hero { padding: 40px 0 30px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .app-mock { max-width: 100%; }
}