/* 天津天合安众智能科技 */

:root {
  --paper: #fbf8f2;
  --paper-2: #f3efe6;
  --ink: #1c1916;
  --muted: #5f594f;
  --line: #e4ddd2;
  --accent: #9a2a1f;
  --accent-hover: #7c2018;
  --accent-soft: #c44838;
  --font-serif: "Noto Serif CJK SC", "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --header-h: 5.35rem;
  --wrap: min(1180px, calc(100% - 3rem));
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }
.nowrap { white-space: nowrap; }
img, svg { display: block; max-width: 100%; }
img { height: auto; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 0.8rem;
  z-index: 40;
}
.skip:focus { top: 1rem; }

.wrap { width: var(--wrap); margin: 0 auto; }

header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--header-h);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1rem;
  position: relative;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: inherit;
  flex: none;
  min-width: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.12rem;
  line-height: 1;
}
.brand-zh {
  font-family: var(--font-serif);
  font-size: 1.28rem;
  letter-spacing: 0.12em;
}
.brand-en {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  text-transform: uppercase;
}
.logo,
.seal {
  width: 2.55rem;
  height: 2.55rem;
  flex: none;
  display: block;
  border-radius: 0.4rem;
}

.nav-end {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  margin-left: auto;
  min-width: 0;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: none;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  position: relative;
}
.lang-switch button {
  margin: 0;
  border: 0;
  background: none;
  padding: 0.15rem 0.05rem;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  letter-spacing: inherit;
  border-bottom: 1px solid transparent;
  position: relative;
  z-index: 1;
  transition: color 0.35s ease, border-color 0.35s ease, text-shadow 0.45s ease;
}
.lang-switch button:hover,
.lang-switch button:focus-visible {
  color: var(--ink);
  text-shadow: 0 0 12px color-mix(in srgb, var(--ink) 22%, transparent);
}
.lang-switch button[aria-pressed="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
  text-shadow: 0 0 10px color-mix(in srgb, var(--accent) 30%, transparent);
}
.lang-switch button.is-flash {
  text-shadow: 0 0 16px color-mix(in srgb, var(--accent) 55%, transparent),
               0 0 28px color-mix(in srgb, var(--accent) 28%, transparent);
}
.lang-ghost {
  position: absolute;
  pointer-events: none;
  z-index: 0;
  color: var(--accent);
  font: inherit;
  letter-spacing: inherit;
  line-height: 1;
  white-space: nowrap;
  opacity: 0.65;
  animation: lang-afterimage 0.58s ease-out forwards;
}
@keyframes lang-afterimage {
  0% {
    opacity: 0.65;
    transform: translate(0, 0) scale(1);
    filter: blur(0);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx, 0.4em), -0.18em) scale(1.28);
    filter: blur(4px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .lang-switch button { transition: none; text-shadow: none !important; }
  .lang-ghost { display: none; }
}
.lang-sep { color: var(--line); user-select: none; }

#nav-check { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 1.05rem;
  height: 1.5px;
  background: currentColor;
  position: relative;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}
.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }

header nav ul {
  display: flex;
  align-items: center;
  gap: 0.2rem 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
header nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 1.08rem;
  letter-spacing: 0.04em;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
}
header nav a:hover,
header nav a:focus-visible { color: var(--ink); }
header nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}
header nav a.nav-contact {
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 0.42rem 1rem;
  border-bottom: 1px solid var(--line);
}
header nav a.nav-contact:hover,
header nav a.nav-contact:focus-visible {
  border-color: var(--ink);
}

/* Home hero */
.hero {
  padding: 2.5rem 0 3.2rem;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem 2.5rem;
  align-items: center;
  min-height: calc(100svh - var(--header-h) - 4rem);
}
.hero-copy { min-width: 0; }
.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.28em;
  margin: 0 0 1.3rem;
}
.hero h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.2rem, 5vw, 3.85rem);
  line-height: 1.18;
  letter-spacing: 0.04em;
  margin: 0 0 1.4rem;
}
.hero .lead {
  text-wrap: pretty;
  max-width: 22em;
  margin: 0 0 2.1rem;
  font-size: clamp(1.05rem, 1.5vw, 1.18rem);
  color: var(--muted);
  line-height: 1.85;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  text-decoration: none;
  padding: 0.72rem 1.25rem;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.btn-primary {
  background: var(--accent);
  color: #fffdf8;
  border: 1px solid var(--accent);
}
.btn-primary:hover,
.btn-primary:focus-visible { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-ghost:hover,
.btn-ghost:focus-visible { border-color: var(--ink); }

.hero-photo {
  margin: 0;
  overflow: hidden;
  background: var(--paper-2);
  width: 100%;
  min-height: 280px;
  aspect-ratio: 4 / 3;
  align-self: center;
}
.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 40% 50%;
}

/* Services */
.home-services { padding: 0 0 2rem; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 2.6rem 0 1rem;
  border-top: 1px solid var(--line);
}
.section-label {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.28em;
  color: var(--muted);
}

.chapter {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.4rem 3.5rem;
  align-items: center;
  padding: 3.2rem 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}
.chapter:last-of-type { border-bottom: 1px solid var(--line); }
.chapter .index {
  font-family: var(--font-serif);
  color: var(--accent);
  letter-spacing: 0.12em;
  font-size: 0.95rem;
  margin: 0 0 0.8rem;
}
.chapter h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 2.8vw, 2.05rem);
  line-height: 1.35;
  letter-spacing: 0.05em;
  margin: 0 0 0.4rem;
}
.chapter h2 a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease, text-shadow 0.4s ease;
}
.chapter h2 a:hover,
.chapter h2 a:focus-visible {
  color: var(--accent);
  text-shadow: 0 0 16px color-mix(in srgb, var(--accent) 28%, transparent);
}
.en-name {
  margin: 0 0 1.1rem;
  color: var(--muted);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
}
.chapter p {
  text-wrap: pretty;
  margin: 0 0 1rem;
  color: #3a352f;
  max-width: 38rem;
}
.more {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--ink);
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 35%, transparent);
  padding-bottom: 0.12rem;
}
.chapter:hover .more,
.chapter:focus-visible .more { border-bottom-color: var(--accent); color: var(--accent); }
.chapter:hover .more .arrow,
.chapter:focus-visible .more .arrow { transform: translateX(4px); }
.arrow { display: inline-block; transition: transform 0.2s ease; }

.visual {
  margin: 0;
  overflow: hidden;
  background: var(--paper-2);
  aspect-ratio: 4 / 3;
  min-height: 220px;
}
.visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}
.chapter:hover .visual img { transform: scale(1.03); }

.consult {
  margin: 0 0 1.15rem;
  font-size: 0.95rem;
  color: var(--muted);
}
.consult a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  padding-bottom: 0.05rem;
  word-break: break-all;
}
.consult a:hover,
.consult a:focus-visible {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
}
.page-hero .consult { margin: 1.2rem 0 0; }

/* Contact */
.contact { padding: 5.5rem 0 5rem; }
.contact h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  letter-spacing: 0.08em;
  margin: 0 0 0.8rem;
}
.contact .intro {
  margin: 0 0 1.2rem;
  color: var(--muted);
  max-width: 28rem;
}
.contact .address {
  margin: 0 0 1.4rem;
  color: var(--ink);
  max-width: 36rem;
  font-size: 1.05rem;
  line-height: 1.7;
}
.contact .email-line {
  margin: 0;
  color: var(--ink);
  max-width: 36rem;
  font-size: 1.05rem;
  line-height: 1.7;
}
.contact .email-line .email {
  font-size: inherit;
}
.email {
  display: inline-block;
  color: var(--accent);
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  padding-bottom: 0.15rem;
  word-break: break-all;
}
.email:hover,
.email:focus-visible {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
}

footer {
  border-top: 1px solid var(--line);
  padding: 1.7rem 0 2.2rem;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.7;
  background: var(--paper-2);
}
footer .wrap {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

/* Subpage */
.page-hero { padding: 3.2rem 0 3.4rem; }
.page-hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.4rem 3.2rem;
  align-items: center;
}
.crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.crumb a { text-decoration: none; }
.crumb a:hover, .crumb a:focus-visible { color: var(--ink); }
.page-hero .index {
  font-family: var(--font-serif);
  color: var(--accent);
  letter-spacing: 0.14em;
  margin: 0 0 0.8rem;
  font-size: 0.95rem;
}
.page-hero h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.7rem, 3.6vw, 2.55rem);
  line-height: 1.3;
  letter-spacing: 0.05em;
  margin: 0 0 0.45rem;
}
.page-hero .en-name { color: var(--muted); }
.page-hero .lead {
  margin: 0;
  max-width: 42rem;
  color: #3a352f;
  font-size: 1.05rem;
  text-wrap: pretty;
}
.page-photo {
  margin: 0;
  overflow: hidden;
  background: var(--paper-2);
  aspect-ratio: 4 / 3;
}
.page-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-body { padding: 0.4rem 0 2rem; }
.block { margin: 0 0 2.4rem; max-width: 46rem; }
.block h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.06em;
  margin: 0 0 0.6rem;
}
.block p { margin: 0; color: #3a352f; }
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 0.5rem;
  padding: 0;
  list-style: none;
  max-width: 46rem;
}
.tags li {
  border: 1px solid var(--line);
  background: #fff;
  padding: 0.22rem 0.7rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  max-width: 46rem;
  margin: 3rem 0 0;
  padding-top: 1.8rem;
  border-top: 1px solid var(--line);
}
.pager a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
}
.pager a:hover, .pager a:focus-visible { color: var(--accent); }
.pager .next { margin-left: auto; text-align: right; }
.pager .k {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  margin-bottom: 0.2rem;
  color: var(--muted);
}

.sub .contact { border-top: 1px solid var(--line); padding: 4.2rem 0 4.5rem; }


/* Bilingual: show only the active language */
html[lang="en"] [lang="zh-CN"],
html:not([lang="en"]) [lang="en"] {
  display: none;
}
html[lang="en"] .en-name { display: none; }
html[lang="en"] .hero h1,
html[lang="en"] .chapter h2,
html[lang="en"] .page-hero h1,
html[lang="en"] .contact h2,
html[lang="en"] .block h2 {
  font-family: "Palatino Linotype", Palatino, "Iowan Old Style", "Times New Roman", serif;
  letter-spacing: 0;
}
html[lang="en"] .hero h1 {
  letter-spacing: -0.02em;
  line-height: 1.15;
}
html[lang="en"] .eyebrow,
html[lang="en"] .section-label {
  letter-spacing: 0.14em;
}
html[lang="en"] .hero .lead { max-width: 26em; }

@media (max-width: 860px) {
  :root { --wrap: min(1180px, calc(100% - 2rem)); }
  .nav-end { gap: 0.55rem; }
  .lang-switch { order: 1; }
  .nav-toggle { display: flex; order: 2; }
  header nav {
    display: none;
    order: 3;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: var(--wrap);
    background: #fff;
    border: 1px solid var(--line);
    padding: 0.6rem 0;
  }
  #nav-check:checked ~ nav { display: block; }
  header nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  header nav a,
  header nav a.nav-contact {
    display: block;
    padding: 0.75rem 1rem;
    border: 0;
  }
  header nav a.nav-contact {
    margin: 0.4rem 1rem 0.6rem;
    text-align: center;
    border: 1px solid var(--line);
  }

  .hero { padding: 1.4rem 0 2rem; }
  .hero .wrap {
    grid-template-columns: 1fr;
    gap: 1.6rem;
    min-height: 0;
  }
  .hero-photo {
    order: -1;
    max-height: 42vh;
    aspect-ratio: 16 / 10;
    align-self: auto;
  }
  .hero h1 { letter-spacing: 0.05em; }
  .section-head { padding: 2rem 0 0.4rem; }
  .chapter {
    grid-template-columns: 1fr;
    gap: 1.3rem;
    padding: 2.2rem 0 2.4rem;
  }
  .visual { order: -1; }
  .page-hero { padding: 2.2rem 0 2.2rem; }
  .page-hero .wrap { grid-template-columns: 1fr; gap: 1.4rem; }
  .page-photo { order: -1; }
  .contact { padding: 3.4rem 0 3.2rem; }
}