:root {
  --yellow: #f5c518;
  --yellow-deep: #dfb000;
  --black: #0f0f0f;
  --black-soft: #171717;
  --white: #f7f5f0;
  --gray: #606060;
  --line: rgba(255,255,255,0.08);
  --shadow: 0 18px 50px rgba(0,0,0,.18);
}
* { box-sizing: border-box; }
html {
  max-width: 100%;
  overflow-x: hidden;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  max-width: 100%;
  overflow-x: hidden;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  color: var(--black);
  background: var(--white);
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { font: inherit; }
.container {
  width: calc(100% - 32px);
  max-width: 1320px;
  margin: 0 auto;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(15,15,15,.94);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.header-inner {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
.brand-logo-wrap {
  width: 66px;
  height: 66px;
  border-radius: 16px;
  overflow: hidden;
  border: 2px solid rgba(245,197,24,.95);
  background: #fff;
  box-shadow: 0 10px 30px rgba(245,197,24,.18);
  flex-shrink: 0;
}
.brand-logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.brand-copy-row {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}
.brand-title {
  color: #fff;
  line-height: 1;
  white-space: nowrap;
}
.brand-title-it,
.hero-it,
.section-brand-it,
.footer-it {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 800;
  letter-spacing: .06em;
}
.brand-title-it { font-size: 28px; margin-right: .14em; }
.brand-title-zh {
  font-size: 28px;
  font-weight: 900;
}
.brand-inline-slogan {
  font-style: normal;
  color: var(--yellow);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  white-space: nowrap;
  opacity: .92;
}
.nav {
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: flex-end;
}
.nav a {
  color: rgba(255,255,255,.78);
  font-size: 14px;
  font-weight: 600;
}
.nav a:hover { color: var(--yellow); }
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}
.hero {
  position: relative;
  min-height: clamp(640px, calc(100svh - 84px), 900px);
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--black);
}
.hero-bg,
.hero-bg img,
.hero-overlay {
  position: absolute;
  inset: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  opacity: 0.72;
  filter: contrast(1.08) brightness(0.95);
  transition: opacity 0.3s ease;
}
.hero-overlay {
  background: linear-gradient(90deg,
    rgba(15, 15, 15, 0.92) 0%,
    rgba(15, 15, 15, 0.80) 32%,
    rgba(15, 15, 15, 0.52) 55%,
    rgba(15, 15, 15, 0.18) 78%,
    rgba(15, 15, 15, 0.08) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 0;
}
.hero-text {
  max-width: 680px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  margin: 0 0 16px;
  padding: 0 14px;
  border: 1px solid rgba(245,197,24,.28);
  background: rgba(245,197,24,.1);
  color: var(--yellow);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .08em;
}
.hero h1 {
  margin: 0;
  color: #fff;
  font-size: clamp(56px, 8vw, 108px);
  line-height: .98;
  font-weight: 900;
}
.hero-it { margin-right: .14em; }
.hero-zhanggong { font-weight: 900; }
.hero-subtitle {
  margin: 18px 0 0;
  color: var(--yellow);
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 800;
  line-height: 1.5;
  max-width: 28em;
}
.hero-services {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  max-width: 760px;
}
.hero-services span {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.05);
  color: rgba(255,255,255,.88);
  font-size: 14px;
  font-weight: 800;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 30px;
}
.btn {
  min-height: 56px;
  padding: 0 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  transition: .24s ease;
  border: 0;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--yellow);
  color: var(--black);
  box-shadow: 0 14px 32px rgba(245,197,24,.22);
}
.btn-secondary,
.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,.2);
}
.btn-dark {
  background: var(--black);
  color: #fff;
}
.btn-outline-dark {
  color: var(--black);
  border-color: rgba(15,15,15,.35);
}
.section { padding: 92px 0; scroll-margin-top: 96px; }
.section-light { background: #fff; }
.section-dark { background: var(--black); }
.section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 34px;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.1;
  font-weight: 900;
}
.section-head-dark h2 { color: #fff; }
.section-line {
  width: 52px;
  height: 2px;
  background: var(--yellow);
  flex-shrink: 0;
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: 24px;
}
.service-card {
  border: 1px solid #eef0f4;
  background: #fff;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  border-radius: 8px;
  overflow: hidden;
  min-height: 400px; 
}
.service-card .card-body,
.service-card:not(.with-image) {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.card-image {
  height: auto;
  aspect-ratio: 2 / 1;
  overflow: hidden; 
  border-bottom: 1px solid #f1f1f1;
}
.card-image img { 
  width: 100%; 
  height: 100%; 
  object-fit: cover; 
}
.service-icon {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--yellow);
  color: var(--black);
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 16px;
  border-radius: 4px;
}
.service-card h3 { margin: 0 0 10px; font-size: 22px; font-weight: 800; color: var(--black); }
.service-card p { margin: 0; color: var(--gray); line-height: 1.7; font-size: 14px; }
.service-card em {
  margin-top: auto; 
  padding-top: 16px;
  color: #b08d05;
  font-style: normal;
  font-size: 13px;
  font-weight: 700;
}
.with-image-dark {
  background: #fff !important; 
}
.with-image-dark h3 {
  color: var(--black) !important;
}
.with-image-dark p {
  color: var(--gray) !important;
}
.client-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 20px;
}
.client-list article {
  background: #161616;
  border-left: 4px solid transparent;
  padding: 24px;
  border-radius: 0 4px 4px 0;
  transition: all 0.2s;
}
.client-list article:hover { border-left-color: var(--yellow); background: #202020; }
.client-list h3 { color: #fff; margin: 0 0 10px; font-size: 18px; font-weight: 700; }
.client-list p { margin: 0; color: rgba(255,255,255,.62); line-height: 1.6; font-size: 14px; }
.promise-section { padding-bottom: 42px; }
.promise-grid,
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 20px;
}
.promise-grid article,
.process-grid article {
  padding: 24px;
  border: 1px solid #eef0f4;
  background: #fff;
  border-radius: 6px;
}
.promise-grid span,
.process-grid span {
  display: inline-flex;
  min-width: 44px;
  height: 44px;
  padding: 0 14px;
  align-items: center;
  justify-content: center;
  background: var(--yellow);
  color: var(--black);
  font-weight: 700;
  margin-bottom: 16px;
  border-radius: 4px;
}
.process-grid h3 { margin: 0 0 10px; font-size: 18px; }
.promise-grid p,
.process-grid p { margin: 0; color: var(--gray); line-height: 1.7; font-size: 14px; }
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 48px;
  align-items: center;
}
.about-image-wrap { position: relative; }
.about-image {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  border-radius: 8px;
}
.about-sticker {
  position: absolute;
  left: 16px;
  bottom: 16px;
  background: var(--yellow);
  color: var(--black);
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 700;
  border-radius: 4px;
}
.about-copy p {
  color: rgba(255,255,255,.72);
  line-height: 1.8;
  margin: 0 0 16px;
  font-size: 15px;
}
.about-stats {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-stats article {
  padding: 14px 0;
  border-top: 1px solid rgba(255,255,255,.1);
}
.about-stats strong {
  display: block;
  color: var(--yellow);
  font-size: 24px;
  font-weight: 800;
}
.about-stats span {
  color: rgba(255,255,255,.56);
  font-size: 13px;
}
.contact-section { background: var(--yellow); }
.contact-title {
  margin: 0 0 32px;
  color: var(--black);
  text-align: center;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
}
.contact-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 32px;
  padding: 40px;
  background: rgba(15,15,15,.05);
  border: 1px solid rgba(15,15,15,.08);
  border-radius: 8px;
}
.contact-col { display: grid; gap: 24px; }
.contact-item { display: flex; flex-direction: column; gap: 6px; }
.contact-label {
  color: rgba(15,15,15,.6);
  font-size: 13px;
  font-weight: 700;
}
.phone-number,
.contact-item strong {
  color: var(--black);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
  font-weight: 800;
}
.small-strong { font-size: 18px !important; margin-bottom: 4px; display: block; }
.wechat-copy-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
}
.copy-wechat {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(15,15,15,.25);
  border-radius: 4px;
  background: rgba(255,255,255,.45);
  color: var(--black);
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}
.copy-wechat:hover { background: rgba(255,255,255,.72); }
.copy-feedback {
  min-height: 1.4em;
  color: rgba(15,15,15,.68) !important;
  font-size: 13px !important;
}
.contact-item p { margin: 0; color: rgba(15,15,15,.7); line-height: 1.6; font-size: 14px; }
.contact-actions {
  margin-top: 32px;
  display: flex;
  gap: 16px;
  justify-content: center;
}
.record-placeholder {
  margin: 24px 0 0;
  text-align: center;
  color: rgba(15,15,15,.5);
  font-size: 13px;
}
.site-footer {
  background: var(--black);
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 30px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-brand {
  font-size: 22px;
  font-weight: 800;
}
.footer-it { color: var(--yellow); }
.footer-zhang { color: #fff; }
.footer-meta {
  color: #666;
  font-size: 13px;
}
.mobile-contact-bar { display: none; }
@media (max-width: 980px) {
  .nav { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-image { max-height: 360px; }
}
@media (min-width: 641px) and (max-width: 980px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 10px 0 12px;
  }
  .nav {
    width: 100%;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,.08);
  }
  .nav a { font-size: 13px; }
  .section { scroll-margin-top: 140px; }
}
@media (max-width: 640px) {
  body { padding-bottom: calc(58px + env(safe-area-inset-bottom)); }
  .container { width: min(100% - 28px, 1180px); }
  .section { padding: 50px 0; scroll-margin-top: 64px; }
  .header-inner { min-height: 64px; }
  .brand-logo-wrap { width: 44px; height: 44px; border-radius: 8px; }
  .brand-title-it, .brand-title-zh { font-size: 20px; }
  .brand-inline-slogan { display: none; }
  .hero { min-height: auto; }
  .hero-content { padding: 48px 0; }
  .hero h1 { font-size: 40px; }
  .hero-subtitle { font-size: 18px; margin-top: 14px; }
  .hero-services { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .hero-services span { text-align: center; justify-content: center; font-size: 13px; padding: 8px; min-height: auto; }
  .hero-actions { flex-direction: column; gap: 12px; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .service-grid { grid-template-columns: 1fr; gap: 22px; }
  .service-card { min-height: auto; border-radius: 10px; }
  .service-card:not(.with-image), .service-card .card-body { padding: 20px; }
  .about-stats { grid-template-columns: 1fr; gap: 8px; }
  .contact-panel { grid-template-columns: 1fr; padding: 24px; }
  .contact-actions { flex-direction: column; gap: 12px; }
  .contact-actions .btn { width: 100%; }
  .footer-inner { flex-direction: column; text-align: center; }
  .mobile-contact-bar {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 200;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: calc(54px + env(safe-area-inset-bottom));
    padding-bottom: env(safe-area-inset-bottom);
    background: var(--black);
    border-top: 1px solid rgba(255,255,255,.12);
  }
  .mobile-contact-bar a,
  .mobile-contact-bar button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    border: 0;
    color: #fff;
    background: transparent;
    font: inherit;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
  }
  .mobile-contact-bar a:first-child { background: var(--yellow); color: var(--black); }
  .hero-overlay {
    background: linear-gradient(
      90deg,
      rgba(15, 15, 15, 0.96) 0%,
      rgba(15, 15, 15, 0.9) 60%,
      rgba(15, 15, 15, 0.72) 100%
    );
  }
  .hero-bg img { object-position: center center; opacity: 0.5; }
  .site-footer { padding-bottom: 82px; }
}
@media (max-width: 380px) {
  .hero-services { grid-template-columns: 1fr; }
  .phone-number, .contact-item strong { font-size: 22px; }
}
@media (max-width: 360px) {
  .container {
    width: min(100% - 22px, 1180px);
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .service-card h3 {
    font-size: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* =========================
   AI 办公与智能体服务
========================= */
.section-ai {
  background: #f7f5f0;
}
.ai-intro {
  max-width: 820px;
  margin: -12px 0 30px;
}
.ai-intro p {
  margin: 0;
  color: var(--gray);
  font-size: 16px;
  line-height: 1.8;
}
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 20px;
}
.ai-card {
  padding: 26px;
  border: 1px solid #ece9df;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 14px 38px rgba(0,0,0,.09);
}
.ai-card span {
  display: inline-flex;
  min-width: 58px;
  height: 34px;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--black);
  color: var(--yellow);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .04em;
}
.ai-card h3 {
  margin: 0 0 10px;
  color: var(--black);
  font-size: 20px;
  font-weight: 900;
}
.ai-card p {
  margin: 0;
  color: var(--gray);
  font-size: 14px;
  line-height: 1.75;
}
.ai-tech-note {
  margin-top: 24px;
  padding: 22px 24px;
  border-left: 5px solid var(--yellow);
  background: #111;
  color: #fff;
  border-radius: 8px;
}
.ai-tech-note strong {
  color: var(--yellow);
  font-size: 16px;
}
.ai-tech-note p {
  margin: 8px 0 0;
  color: rgba(255,255,255,.72);
  font-size: 14px;
  line-height: 1.75;
}

@media (max-width: 640px) {
  .ai-intro {
    margin: -8px 0 24px;
  }
  .ai-intro p {
    font-size: 15px;
  }
  .ai-card {
    padding: 22px;
  }
  .ai-tech-note {
    padding: 20px;
  }
}

/* =========================
   全屏与多设备响应式补强
   大屏：扩大内容区，背景始终铺满
   手机：按屏幕宽度自动重排，避免横向滚动
========================= */

/* 让所有主区块的背景横向铺满屏幕，内容仍保持易读宽度 */
.site-header,
.hero,
.section,
.site-footer {
  width: 100%;
}

.hero-bg {
  overflow: hidden;
  background: #0f0f0f;
}

.hero-text {
  width: min(100%, 760px);
}

/* 常规大屏与 2K 显示器 */
@media (min-width: 1440px) {
  .container {
    max-width: 1440px;
    width: calc(100% - 64px);
  }

  .header-inner {
    min-height: 88px;
  }

  .hero {
    min-height: clamp(680px, calc(100svh - 88px), 920px);
  }

  .hero-content {
    padding: 76px 0;
  }

  .hero-text {
    max-width: 780px;
  }

  .hero h1 {
    font-size: clamp(82px, 6vw, 116px);
  }

  .hero-subtitle {
    max-width: 32em;
  }
}

/* 超宽屏：保持画面饱满，但不过度拉伸文字和卡片 */
@media (min-width: 1920px) {
  .container {
    max-width: 1540px;
    width: calc(100% - 96px);
  }

  .hero-bg img {
    object-position: center 46%;
  }

  .hero-overlay {
    background: linear-gradient(90deg,
      rgba(15, 15, 15, 0.88) 0%,
      rgba(15, 15, 15, 0.72) 30%,
      rgba(15, 15, 15, 0.42) 54%,
      rgba(15, 15, 15, 0.12) 80%,
      rgba(15, 15, 15, 0.04) 100%);
  }
}

/* 平板 */
@media (max-width: 980px) {
  .container {
    width: calc(100% - 32px);
  }

  .hero {
    min-height: clamp(620px, calc(100svh - 120px), 820px);
  }

  .hero-bg img {
    object-position: 62% center;
  }

  .hero-text {
    max-width: 680px;
  }

  .service-grid,
  .ai-grid,
  .client-list,
  .promise-grid,
  .process-grid {
    align-items: stretch;
  }
}

/* 手机 */
@media (max-width: 640px) {
  .container {
    width: calc(100% - 24px);
  }

  .site-header {
    position: sticky;
  }

  .hero {
    min-height: calc(100svh - 64px);
    align-items: center;
  }

  .hero-content {
    width: 100%;
    padding: 50px 0 56px;
  }

  .hero-text {
    width: 100%;
    max-width: none;
  }

  .hero-bg img {
    object-position: 68% center;
    opacity: 0.54;
  }

  .hero-overlay {
    background: linear-gradient(90deg,
      rgba(15, 15, 15, 0.94) 0%,
      rgba(15, 15, 15, 0.84) 58%,
      rgba(15, 15, 15, 0.58) 100%);
  }

  .hero-kicker {
    max-width: 100%;
    min-height: 34px;
    white-space: normal;
    line-height: 1.5;
  }

  .hero h1 {
    font-size: clamp(40px, 13vw, 54px);
  }

  .hero-subtitle {
    max-width: none;
    font-size: clamp(17px, 5vw, 21px);
    line-height: 1.55;
  }

  .hero-services {
    width: 100%;
  }

  .section-head {
    align-items: flex-start;
  }

  .section-head h2 {
    font-size: clamp(27px, 8vw, 34px);
  }

  .section-line {
    width: 38px;
    margin-top: 15px;
  }

  .service-grid,
  .ai-grid,
  .client-list,
  .promise-grid,
  .process-grid,
  .about-grid,
  .contact-panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .service-card,
  .ai-card,
  .client-list article,
  .promise-grid article,
  .process-grid article,
  .contact-panel {
    min-width: 0;
  }

  .card-image {
    width: 100%;
    aspect-ratio: 2 / 1;
  }

  .about-image {
    width: 100%;
    max-height: none;
    aspect-ratio: 1 / 1;
  }
}

/* 极窄手机 */
@media (max-width: 390px) {
  .container {
    width: calc(100% - 20px);
  }

  .hero-content {
    padding-top: 42px;
  }

  .hero-services {
    grid-template-columns: 1fr 1fr;
  }

  .btn {
    min-height: 52px;
    padding: 0 20px;
  }
}

/* 手机横屏，防止首屏内容被截断 */
@media (max-width: 900px) and (orientation: landscape) {
  .hero {
    min-height: 620px;
  }
}
/* =========================
   顶部品牌区与导航按比例放大
   保持桌面、平板、手机端协调
========================= */

/* 常规桌面 */
.header-inner {
  min-height: 96px;
  gap: 28px;
}

.brand {
  gap: 16px;
}

.brand-logo-wrap {
  width: 74px;
  height: 74px;
  border-radius: 17px;
}

.brand-copy-row {
  gap: 18px;
}

.brand-title-it {
  font-size: 32px;
}

.brand-title-zh {
  font-size: 32px;
}

.brand-inline-slogan {
  font-size: 15px;
  letter-spacing: .075em;
}

.nav {
  gap: 24px;
}

.nav a {
  font-size: 16px;
  font-weight: 700;
}

/* 较大桌面与 2K 屏幕 */
@media (min-width: 1440px) {
  .header-inner {
    min-height: 100px;
  }

  .brand-logo-wrap {
    width: 78px;
    height: 78px;
    border-radius: 18px;
  }

  .brand-title-it,
  .brand-title-zh {
    font-size: 34px;
  }

  .brand-inline-slogan {
    font-size: 16px;
  }

  .nav {
    gap: 26px;
  }

  .nav a {
    font-size: 16px;
  }

  .hero {
    min-height: clamp(680px, calc(100svh - 100px), 920px);
  }
}

/* 平板横屏与小尺寸笔记本 */
@media (min-width: 641px) and (max-width: 980px) {
  .header-inner {
    min-height: 88px;
    gap: 18px;
  }

  .brand-logo-wrap {
    width: 62px;
    height: 62px;
    border-radius: 14px;
  }

  .brand-title-it,
  .brand-title-zh {
    font-size: 27px;
  }

  .brand-inline-slogan {
    font-size: 13px;
  }

  .nav {
    gap: 12px;
  }

  .nav a {
    font-size: 14px;
  }
}

/* 手机：品牌名略微放大，继续隐藏口号与导航，避免拥挤 */
@media (max-width: 640px) {
  .header-inner {
    min-height: 70px;
  }

  .brand-logo-wrap {
    width: 48px;
    height: 48px;
    border-radius: 10px;
  }

  .brand-title-it,
  .brand-title-zh {
    font-size: 23px;
  }

  .hero {
    min-height: calc(100svh - 70px);
  }
}

/* 极窄手机 */
@media (max-width: 360px) {
  .brand-logo-wrap {
    width: 44px;
    height: 44px;
  }

  .brand-title-it,
  .brand-title-zh {
    font-size: 21px;
  }
}