/* ============================================================
   LUTONG STUDIO · Components
   导航栏 / 页脚 / 按钮 / 卡片 / Hero 视觉 / 表单 / 手风琴 / 流程
   ============================================================ */

/* =========================================================
   按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 24px;
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
  transition: transform var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(0.99); }

.btn--primary {
  color: var(--color-white);
  background: var(--gradient-accent);
  box-shadow: var(--glow-accent);
}
.btn--primary:hover {
  box-shadow: 0 0 56px rgba(124, 92, 255, 0.45);
  transform: translateY(-2px);
}

.btn--ghost {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
  transform: translateY(-2px);
}

.btn--accent {
  color: var(--color-accent-cyan);
  border-color: rgba(57, 216, 255, 0.3);
  background: rgba(57, 216, 255, 0.06);
}
.btn--accent:hover {
  background: rgba(57, 216, 255, 0.12);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.btn--block { width: 100%; }
.btn--sm { min-height: 42px; padding: 0 18px; font-size: var(--text-sm); }

/* =========================================================
   导航栏
   ========================================================= */
.nav {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  transition: top var(--duration-base) var(--ease-out);
}
.nav__inner {
  max-width: 1480px; /* 顶部状态：更宽 */
  margin-inline: auto;
  padding: 10px 10px 10px 22px;
  display: flex;
  align-items: center;
  gap: var(--space-5);
  background: rgba(10, 11, 15, 0.55);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-nav);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-soft);
  transition: background var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    max-width 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
}
/* 滚动后加深 + 收窄到原始 1280px（弹性收缩） */
.nav.is-scrolled .nav__inner {
  max-width: var(--container-max);
  background: rgba(7, 7, 10, 0.82);
  border-color: var(--color-border-hover);
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
}
.nav__logo svg { width: 34px; height: 34px; display: block; }
.nav__logo .studio-exp-back__logo {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  color: #f5f7fa;
  background: #0e1016;
  border: 1px solid rgba(255, 255, 255, 0.16);
}
.nav__logo-text { line-height: 1.05; }
.nav__logo-cn {
  font-weight: var(--weight-bold);
  font-size: 1rem;
  color: var(--color-text);
  letter-spacing: 0.02em;
}
.nav__logo-en {
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.nav__link {
  position: relative;
  padding: 10px 14px;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 1.5px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-out);
}
.nav__link:hover { color: var(--color-text); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link.is-active {
  color: var(--color-text);
}
.nav__link.is-active::after { transform: scaleX(1); }

.nav__actions { display: flex; align-items: center; gap: var(--space-3); }

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}
.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.06);
  transform: scale(1.05);
}
.theme-toggle:active { transform: scale(0.96); }
.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 2px;
}
.theme-toggle__icon { width: 18px; height: 18px; }
/* 暗色（默认）：显示太阳图标（点击切到亮） */
.theme-toggle__icon--moon { display: none; }
/* 亮色：显示月亮图标（点击切到暗） */
[data-theme="light"] .theme-toggle__icon--sun { display: none; }
[data-theme="light"] .theme-toggle__icon--moon { display: block; }
[data-theme="light"] .theme-toggle { background: rgba(0, 0, 0, 0.03); }
[data-theme="light"] .theme-toggle:hover { background: rgba(0, 0, 0, 0.06); }

/* ---------- 语言切换按钮 ---------- */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 38px;
  padding: 0 10px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}
.lang-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.06);
  transform: scale(1.05);
}
.lang-toggle:active { transform: scale(0.96); }
.lang-toggle:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 2px;
}
.lang-toggle__txt { line-height: 1; }
[data-theme="light"] .lang-toggle { background: rgba(0, 0, 0, 0.03); }
[data-theme="light"] .lang-toggle:hover { background: rgba(0, 0, 0, 0.06); }

/* 汉堡按钮（移动端） */
.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.03);
  position: relative;
}
.nav__toggle span {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration-fast) var(--ease-out), opacity var(--duration-fast);
}
.nav__toggle span:nth-child(1) { top: 16px; }
.nav__toggle span:nth-child(2) { top: 21px; }
.nav__toggle span:nth-child(3) { top: 26px; }
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 移动端遮罩 */
.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  background: rgba(7, 7, 10, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.nav.is-open .nav__overlay { display: block; }

/* 移动端菜单面板 */
.nav__mobile {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(82vw, 340px);
  z-index: var(--z-menu);
  padding: 90px 24px 32px;
  background: var(--color-bg-soft);
  border-left: 1px solid var(--color-border);
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
}
.nav.is-open .nav__mobile { transform: translateX(0); }
.nav__mobile-link {
  padding: 14px 16px;
  font-size: 1.05rem;
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}
.nav__mobile-link:hover,
.nav__mobile-link.is-active {
  color: var(--color-text);
  background: var(--color-surface);
  border-color: var(--color-border);
}
.nav__mobile .btn { margin-top: var(--space-4); }

/* =========================================================
   页脚
   ========================================================= */
.footer {
  position: relative;
  z-index: var(--z-content);
  margin-top: var(--space-9);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  background:
    radial-gradient(700px 300px at 50% 0%, rgba(124, 92, 255, 0.06), transparent 70%);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: var(--space-7);
  padding-bottom: var(--space-7);
}
.footer__brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-4);
}
.footer__brand-logo svg { width: 32px; height: 32px; }
.footer__brand-logo .studio-exp-back__logo {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: #f5f7fa;
  background: #0e1016;
  border: 1px solid rgba(255, 255, 255, 0.16);
}
.footer__brand-text { font-weight: var(--weight-bold); font-size: 1.05rem; }
.footer__desc {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 320px;
}
.footer__col-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: 0.04em;
}
.footer__links { display: flex; flex-direction: column; gap: var(--space-3); }
.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  width: fit-content;
}
.footer__link:hover { color: var(--color-accent-cyan); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.footer__bottom a { color: var(--color-text-muted); }
.footer__bottom a:hover { color: var(--color-text-secondary); }

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: all var(--duration-fast) var(--ease-out);
}
.back-to-top:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

/* =========================================================
   卡片（玻璃表面）
   ========================================================= */
.card {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  overflow: hidden;
  transition: transform var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out),
    background var(--duration-base) var(--ease-out);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  background: var(--color-surface);
  box-shadow: var(--shadow-card), var(--glow-blue);
}

/* 卡片内的细描边高光 */
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.12), transparent 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.6;
}

/* 服务卡片 */
.service-card {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.service-card__icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--gradient-soft);
  border: 1px solid var(--color-border);
  color: var(--color-accent-cyan);
}
.service-card__icon svg { width: 26px; height: 26px; }
.service-card__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}
.service-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  flex: 1;
}
.service-card .link-arrow { margin-top: auto; }

/* 项目大卡（横向） */
.project-card {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
  align-items: stretch;
  min-height: 320px;
}
.project-card__media {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
}
.project-card__body {
  padding: var(--space-7);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.project-card__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.project-card__desc {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}
.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.project-card .btn { margin-top: auto; align-self: flex-start; }
.project-card--ai-outfit .project-card__media {
  background: #090711;
}
.project-card--ai-outfit .project-card__media > img {
  object-fit: contain;
}
.project-card--system .project-card__media > img {
  object-fit: contain;
}

/* 案例卡片 */
.case-card {
  display: flex;
  flex-direction: column;
  cursor: pointer;
}
.case-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}
.case-card__media img,
.case-card__media .ph {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}
.case-card:hover .case-card__media img,
.case-card:hover .case-card__media .ph {
  transform: scale(1.05);
}
.case-card--system .case-card__media img,
.case-card--system:hover .case-card__media img {
  object-fit: contain;
  transform: none;
  background: #020817;
}
.case-card--smart-community .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #eef7f1;
}
.case-card--smart-community .case-card__media img,
.case-card--smart-community:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--data-platform .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #03111f;
}
.case-card--data-platform .case-card__media img,
.case-card--data-platform:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--ai-visual .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #050507;
}
.case-card--ai-visual .case-card__media img,
.case-card--ai-visual:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--marketing-dashboard .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #03111f;
}
.case-card--marketing-dashboard .case-card__media img,
.case-card--marketing-dashboard:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--smart-park-platform .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #f4f8ff;
}
.case-card--smart-park-platform .case-card__media img,
.case-card--smart-park-platform:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--ai-visual-workspace .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #050914;
}
.case-card--ai-visual-workspace .case-card__media img,
.case-card--ai-visual-workspace:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--business-data-platform .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #f4f8ff;
}
.case-card--business-data-platform .case-card__media img,
.case-card--business-data-platform:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--jewelry-asset-system .case-card__media {
  aspect-ratio: 1672 / 941;
  background: #fffaf3;
}
.case-card--jewelry-asset-system .case-card__media img,
.case-card--jewelry-asset-system:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card--finance-app .case-card__media,
.case-card--education-mini-program .case-card__media {
  aspect-ratio: 1672 / 941;
}
.case-card--finance-app .case-card__media { background: #110f0d; }
.case-card--education-mini-program .case-card__media { background: #eff7ff; }
.case-card--finance-app .case-card__media img,
.case-card--finance-app:hover .case-card__media img,
.case-card--education-mini-program .case-card__media img,
.case-card--education-mini-program:hover .case-card__media img {
  object-fit: contain;
  transform: none;
}
.case-card__body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.case-card__cat {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-cyan);
}
.case-card__title {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
}
.case-card .link-arrow { margin-top: var(--space-2); }

/* 数据/价值点小卡 */
.stat-card {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.stat-card__value {
  font-size: var(--text-2xl);
  font-weight: var(--weight-extra);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 价值点列表 */
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); }
.value-item {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.value-item__icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: var(--gradient-soft);
  color: var(--color-accent-cyan);
}
.value-item__icon svg { width: 22px; height: 22px; }
.value-item__title { font-weight: var(--weight-semibold); font-size: var(--text-md); }
.value-item__desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: var(--leading-normal); }

/* =========================================================
   Hero 视觉（设备 mockup / 数据卡 / 轨道）
   ========================================================= */
.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  grid-template-rows: auto auto;
  column-gap: var(--space-7);
  row-gap: var(--space-4);
}
.hero__copy { position: relative; z-index: 2; }
.hero__visual { grid-column: 2; grid-row: 1; }
.hero__cta {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
}
.hero__cta .hero__actions,
.hero__cta .hero__trust { margin-top: 0; }
.hero__title {
  margin-top: var(--space-5);
  font-size: var(--text-4xl);
  font-weight: var(--weight-extra);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.hero__desc {
  margin-top: var(--space-5);
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  max-width: 520px;
}
.hero__actions {
  margin-top: var(--space-6);
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.hero__trust {
  margin-top: var(--space-6);
  display: flex;
  justify-content: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.hero__trust span { display: inline-flex; align-items: center; gap: 8px; }
.hero__trust span::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-accent-cyan);
  box-shadow: var(--glow-cyan);
}

.hero__visual {
  position: relative;
  z-index: 1;
  min-height: 340px;
}
.hero__scene {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 340px;
}

/* ---------- Hero Canvas 动画容器 ---------- */
.hero-canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 528 / 256;
  min-height: 300px;
  background-color: rgba(7, 7, 10, 0.55);
  overflow: hidden;
  border: 1px solid rgba(124, 92, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 0 60px rgba(124, 92, 255, 0.04), inset 0 1px 0 rgba(255,255,255,0.03);
  backdrop-filter: blur(8px);
}
.hero-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}
.hero-canvas-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background: radial-gradient(circle, transparent 50%, rgba(7, 7, 10, 0.5) 100%);
}

/* 设备 mockup 通用 */
.device {
  position: absolute;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-hover);
  background: linear-gradient(160deg, #11141d, #0b0d13);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255,255,255,0.03) inset;
  overflow: hidden;
}
.device--laptop {
  width: 76%;
  left: 6%;
  top: 12%;
  aspect-ratio: 16 / 10;
}
.device--phone {
  width: 23%;
  right: 4%;
  top: 30%;
  aspect-ratio: 9 / 19;
  border-radius: 26px;
  z-index: 3;
}
.device__bar {
  height: 26px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-inline: 12px;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255,255,255,0.02);
}
.device__dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.16); }
.device__screen {
  position: relative;
  height: calc(100% - 26px);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
}
.ui-line {
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(90deg, rgba(255,255,255,0.10), rgba(255,255,255,0.03));
}
.ui-line.w40 { width: 40%; }
.ui-line.w60 { width: 60%; }
.ui-line.w80 { width: 80%; }
.ui-block {
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: rgba(255,255,255,0.03);
  flex: 1;
}
.ui-row { display: flex; gap: 8px; }
.ui-row .ui-block { flex: 1; }

/* 浮动数据卡 */
.data-card {
  position: absolute;
  z-index: 4;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg-strong);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  animation: float-soft 7s ease-in-out infinite;
}
.data-card__icon { color: var(--color-accent-cyan); display: grid; place-items: center; }
.data-card__icon svg { width: 18px; height: 18px; }
.data-card__value { color: var(--color-text); font-weight: var(--weight-semibold); font-size: var(--text-sm); }
.data-card--1 { top: 6%; left: 2%; animation-delay: 0s; }
.data-card--2 { top: 40%; right: 2%; animation-delay: 1.4s; }
.data-card--3 { bottom: 8%; left: 14%; animation-delay: 2.6s; }

/* 抽象轨道/节点 */
.orbital {
  position: absolute;
  inset: -10% -10% auto auto;
  width: 60%;
  aspect-ratio: 1;
  z-index: 0;
  pointer-events: none;
  opacity: 0.9;
}

/* =========================================================
   合作流程
   ========================================================= */
.process {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
  position: relative;
}
.step {
  position: relative;
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.step__num {
  font-size: var(--text-xl);
  font-weight: var(--weight-extra);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.02em;
}
.step__title { font-weight: var(--weight-semibold); font-size: var(--text-md); }
.step__desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: var(--leading-normal); }
/* 连接线（点状发光） */
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 46px;
  right: calc(-1 * var(--space-4) / 2);
  width: var(--space-4);
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0.5;
}

/* =========================================================
   CTA 区块
   ========================================================= */
.cta {
  position: relative;
  padding: var(--space-9) var(--space-7);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(700px 360px at 80% 20%, rgba(124, 92, 255, 0.14), transparent 65%),
    radial-gradient(600px 320px at 10% 90%, rgba(57, 216, 255, 0.10), transparent 60%),
    var(--color-surface);
  border: 1px solid var(--color-border);
  text-align: center;
  overflow: hidden;
}
.cta__title { font-size: var(--text-2xl); font-weight: var(--weight-extra); max-width: 720px; margin-inline: auto; }
.cta__desc { margin-top: var(--space-4); color: var(--color-text-secondary); max-width: 580px; margin-inline: auto; }
.cta__actions { margin-top: var(--space-6); display: flex; gap: var(--space-3); justify-content: center; flex-wrap: wrap; }

/* =========================================================
   表单
   ========================================================= */
.form { display: grid; gap: var(--space-4); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field__label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}
.field__label .req { color: var(--color-accent-cyan); }
.field__control {
  width: 100%;
  min-height: 50px;
  padding: 12px 16px;
  font-size: var(--text-base);
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}
.field__control::placeholder { color: var(--color-text-muted); }
.field__control:focus {
  border-color: var(--color-accent-blue);
  background: rgba(85, 124, 255, 0.06);
}
textarea.field__control { min-height: 130px; resize: vertical; line-height: var(--leading-normal); }
select.field__control {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23A4A9B5' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}

/* 修复 Windows 原生 <select> 下拉弹层白字白底（暗色主题下 option 继承近白文字）
   交叉平台稳妥做法：弹层用白底深字。 */
select.field__control option {
  color: #111827;
  background: #ffffff;
}

/* =========================================================
   手风琴（FAQ）
   ========================================================= */
.accordion { display: flex; flex-direction: column; gap: var(--space-3); }
.accordion__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--glass-bg);
  overflow: hidden;
  transition: border-color var(--duration-fast) var(--ease-out);
}
.accordion__item.is-open { border-color: var(--color-border-hover); }
.accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  text-align: left;
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
}
.accordion__icon {
  flex-shrink: 0;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-accent-cyan);
  transition: transform var(--duration-fast) var(--ease-out), background var(--duration-fast);
}
.accordion__item.is-open .accordion__icon { transform: rotate(45deg); background: rgba(57,216,255,0.1); }
.accordion__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-out);
}
.accordion__panel-inner {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* =========================================================
   内页 Hero（非首页）
   ========================================================= */
.page-hero {
  position: relative;
  padding-top: 150px;
  padding-bottom: var(--space-7);
  z-index: var(--z-content);
}
.page-hero__inner { max-width: 840px; }
.page-hero__title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-extra);
  letter-spacing: -0.01em;
  margin-top: var(--space-4);
}
.page-hero__subtitle {
  margin-top: var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
}

/* 服务/详情页内的服务子模块 */
.feature-block {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-7);
  align-items: center;
  padding: var(--space-7) 0;
  border-top: 1px solid var(--color-border);
}
.feature-block:first-of-type { border-top: none; }
.feature-block__media { order: 0; }
.feature-block:nth-child(even) .feature-block__media { order: 2; }
.feature-block__title { font-size: var(--text-xl); font-weight: var(--weight-bold); }
.feature-block__lead { margin-top: var(--space-4); color: var(--color-text-secondary); font-size: var(--text-md); line-height: var(--leading-normal); }
.feature-list { margin-top: var(--space-5); display: grid; gap: var(--space-3); }
.feature-list__item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
}
.feature-list__item .k {
  color: var(--color-accent-cyan);
  font-weight: var(--weight-semibold);
  min-width: 96px;
}
.feature-list__item .v { color: var(--color-text-secondary); font-size: var(--text-sm); }

/* 服务目录锚点导航 */
.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-7);
}
.anchor-nav a {
  padding: 9px 16px;
  font-size: var(--text-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}
.anchor-nav a:hover { color: var(--color-text); border-color: var(--color-border-hover); background: var(--color-surface-hover); }

/* FAQ / 常见咨询 */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }

/* =========================================================
   占位视觉（无图片时使用）
   ========================================================= */
.ph {
  position: relative;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(124, 92, 255, 0.18), transparent 55%),
    radial-gradient(120% 120% at 100% 100%, rgba(57, 216, 255, 0.14), transparent 55%),
    linear-gradient(160deg, #10131c, #0a0c12);
  overflow: hidden;
}
.ph::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at 50% 40%, #000, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, #000, transparent 80%);
}
.ph__label {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 2;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.ph__glyph {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: rgba(255,255,255,0.14);
}
.ph__glyph svg { width: 56px; height: 56px; }

/* 案例产品图：统一 16:10 展示板，移动端内容在画面内并列呈现。 */
.case-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  margin: var(--space-4) 0 var(--space-7);
}
.case-gallery--system {
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.case-gallery--smart-community,
.case-gallery--ai-visual,
.case-gallery--marketing-dashboard,
.case-gallery--smart-park-platform,
.case-gallery--ai-visual-workspace,
.case-gallery--business-data-platform,
.case-gallery--jewelry-asset-system {
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.case-gallery--finance-app,
.case-gallery--education-mini-program {
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.case-gallery--system .case-gallery__image,
.case-gallery--smart-community .case-gallery__image,
.case-gallery--ai-visual .case-gallery__image,
.case-gallery--marketing-dashboard .case-gallery__image,
.case-gallery--smart-park-platform .case-gallery__image,
.case-gallery--ai-visual-workspace .case-gallery__image,
.case-gallery--business-data-platform .case-gallery__image,
.case-gallery--jewelry-asset-system .case-gallery__image {
  aspect-ratio: auto;
  object-fit: contain;
}
.case-gallery--finance-app .case-gallery__image,
.case-gallery--education-mini-program .case-gallery__image {
  aspect-ratio: auto;
  object-fit: contain;
}
.case-gallery--ai-outfit {
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.case-gallery--ai-outfit .case-gallery__image {
  aspect-ratio: auto;
  object-fit: contain;
  background: #090711;
}
.case-gallery--diandongtong {
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.case-gallery--diandongtong .case-gallery__image {
  aspect-ratio: auto;
  object-fit: contain;
  background: #eef7ff;
}
.case-gallery--pet-jewelry {
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.case-gallery--pet-jewelry .case-gallery__image {
  aspect-ratio: auto;
  object-fit: contain;
  background: #fff7f2;
}
.case-gallery--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.case-gallery__item {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: rgba(11, 14, 22, 0.9);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
}
.case-gallery__image {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  background: var(--color-surface);
}
.case-gallery__caption {
  min-height: 52px;
  display: flex;
  align-items: center;
  padding: 13px 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.5;
}
.case-card__media > img,
.project-card__media > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 服务页视觉资产：与生成稿保持 2.1:1，并以 cover 满框裁切。 */
.feature-block__media .ph {
  height: auto;
  min-height: 0 !important;
  aspect-ratio: 2.1 / 1;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  border: 1px solid rgba(92, 202, 255, 0.14);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 52px rgba(0, 5, 16, 0.3);
}
.feature-block__media .ph::after { display: none; }
.service-visual__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* 表单反馈提示 */
.form-feedback {
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  border: 1px solid var(--color-border);
}
.form-feedback--info { color: var(--color-accent-cyan); border-color: rgba(57,216,255,0.3); background: rgba(57,216,255,0.06); }
.form-feedback--error { color: #ff8f8f; border-color: rgba(255,120,120,0.3); background: rgba(255,120,120,0.06); }
.form-feedback--ok { color: #8fffb5; border-color: rgba(120,255,160,0.3); background: rgba(120,255,160,0.06); }
.field.has-error .field__control { border-color: rgba(255,120,120,0.6); background: rgba(255,120,120,0.05); }

/* 案例筛选按钮 */
.filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-7);
}
.filter__btn {
  padding: 9px 18px;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.02);
  transition: all var(--duration-fast) var(--ease-out);
}
.filter__btn:hover { color: var(--color-text); border-color: var(--color-border-hover); }
.filter__btn.is-active {
  color: var(--color-white);
  background: var(--gradient-accent);
  border-color: transparent;
  box-shadow: var(--glow-accent);
}
.case-card.is-hidden { display: none; }

/* 联系信息卡片 */
.contact-info { display: grid; gap: var(--space-4); }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
}
.contact-item__icon {
  width: 44px; height: 44px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: var(--gradient-soft);
  color: var(--color-accent-cyan);
}
.contact-item__icon svg { width: 22px; height: 22px; }
.contact-item__label { font-size: var(--text-xs); color: var(--color-text-muted); letter-spacing: 0.08em; text-transform: uppercase; }
.contact-item__value { font-size: var(--text-md); font-weight: var(--weight-medium); color: var(--color-text); margin-top: 2px; word-break: break-all; }
.replace-note {
  display: inline-block;
  margin-top: 4px;
  font-size: var(--text-xs);
  color: #ffcf8f;
  opacity: 0.8;
}

/* 详情页：上一/下一导航 */
.detail-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}
.detail-nav a { color: var(--color-text-secondary); font-weight: var(--weight-medium); transition: color var(--duration-fast); }
.detail-nav a:hover { color: var(--color-accent-cyan); }

/* 详情页富文本内容块 */
.rich h2 { font-size: var(--text-xl); margin-top: var(--space-7); margin-bottom: var(--space-4); }
.rich h3 { font-size: var(--text-lg); margin-top: var(--space-5); margin-bottom: var(--space-3); }
.rich p { color: var(--color-text-secondary); line-height: var(--leading-relaxed); margin-bottom: var(--space-3); }
.rich ul { display: grid; gap: var(--space-2); margin: var(--space-3) 0; }
.rich ul li {
  position: relative;
  padding-left: 22px;
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}
.rich ul li::before {
  content: "";
  position: absolute;
  left: 4px; top: 9px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-accent-cyan);
}

/* 二维码占位 */
.qr-ph {
  width: 132px;
  height: 132px;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  padding: 10px;
  display: grid;
  place-items: center;
  position: relative;
}
.qr-ph svg { width: 100%; height: 100%; }
.qr-ph__note {
  position: absolute;
  bottom: -22px;
  left: 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* 微信卡片：技术负责人 / 商务负责人 两个二维码并排 */
.contact-qrs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-3);
}
.qr-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.qr-item__meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.qr-item__name {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text);
}
.qr-item__num {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   亮色主题覆盖：修正 components.css 中硬编码的深色表面
   通过 <html data-theme="light"> 激活
   ============================================================ */
[data-theme="light"] .nav__inner {
  background: rgba(255, 255, 255, 0.6);
}
[data-theme="light"] .nav.is-scrolled .nav__inner {
  background: rgba(255, 255, 255, 0.82);
}
[data-theme="light"] .nav__overlay {
  background: rgba(15, 23, 42, 0.28);
}
[data-theme="light"] .hero-canvas-wrap {
  background-color: rgba(255, 255, 255, 0.5);
  border-color: rgba(124, 92, 255, 0.14);
  box-shadow: inset 0 0 60px rgba(124, 92, 255, 0.06), inset 0 1px 0 rgba(0,0,0,0.03);
}
[data-theme="light"] .hero-canvas-overlay {
  background: radial-gradient(circle, transparent 50%, rgba(255, 255, 255, 0.4) 100%);
}
[data-theme="light"] .device {
  background: linear-gradient(160deg, #f0f2f7, #e2e6ee);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(0,0,0,0.04) inset;
}
[data-theme="light"] .ph {
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(124, 92, 255, 0.16), transparent 55%),
    radial-gradient(120% 120% at 100% 100%, rgba(57, 216, 255, 0.12), transparent 55%),
    linear-gradient(160deg, #e8eaf0, #d8dce6);
}
[data-theme="light"] .ph::after {
  background-image:
    linear-gradient(rgba(0,0,0,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.045) 1px, transparent 1px);
}
[data-theme="light"] .case-gallery__item {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.12);
}
[data-theme="light"] .feature-block__media .ph {
  box-shadow: 0 20px 52px rgba(15, 23, 42, 0.14);
}
/* 亮底下反馈文字加深，保证可读 */
[data-theme="light"] .form-feedback--error { color: #c0392b; }
[data-theme="light"] .form-feedback--ok { color: #1a9d4a; }
[data-theme="light"] .replace-note { color: #b8741a; }