/* ==========================================================================
   3. 按钮
   ========================================================================== */
.btn {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 15px; font-weight: 600; line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  overflow: hidden;
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.btn:active { transform: translateY(1px) scale(.985); }

/* 主按钮：渐变 + 掠光效果 */
.btn--primary {
  color: #fff;
  background: var(--g-brand);
  box-shadow: 0 10px 26px rgba(79,110,247,.34);
}
.btn--primary::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(110deg, transparent 20%, rgba(255,255,255,.42) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform .72s var(--ease);
}
.btn--primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 18px 38px rgba(79,110,247,.46);
}
.btn--primary:hover::after { transform: translateX(120%); }

/* 次级按钮（浅底） */
.btn--ghost {
  color: var(--c-text);
  background: #fff;
  border: 1px solid var(--c-border);
  box-shadow: var(--sh-sm);
}
.btn--ghost:hover {
  transform: translateY(-3px);
  border-color: rgba(59,130,246,.45);
  color: var(--c-blue-deep);
  box-shadow: var(--sh-md);
}

/* 次级按钮（深底 · 玻璃拟态） */
.btn--glass {
  color: #e2e8f0;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.btn--glass:hover {
  transform: translateY(-3px);
  color: #fff;
  background: rgba(255,255,255,.14);
  border-color: rgba(255,255,255,.4);
}

.btn--sm { padding: 10px 20px; font-size: 14px; }
.btn--lg { padding: 16px 34px; font-size: 16.5px; }
.btn--block { width: 100%; }


/* ==========================================================================
   4. 导航栏
   ========================================================================== */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(15,23,42,.72);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
/* 滚动后：切换为浅色实心，提升正文区可读性 */
.nav.is-scrolled {
  background: rgba(255,255,255,.9);
  border-bottom-color: var(--c-border);
  box-shadow: 0 8px 30px rgba(15,23,42,.09);
}

.nav__inner {
  width: 100%; max-width: var(--container);
  margin: 0 auto; padding-inline: 24px;
  display: flex; align-items: center; gap: 24px;
}

/* --- 品牌 LOGO（占位） --- */
.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand__mark {
  position: relative;
  width: 42px; height: 42px; border-radius: 12px;
  padding: 3px;
  background: linear-gradient(135deg, var(--c-blue) 0%, var(--c-purple) 100%);
  display: grid; place-items: center;
  box-shadow: 0 4px 14px rgba(15,23,42,.22);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.brand:hover .brand__mark { transform: rotate(-4deg) scale(1.06); box-shadow: 0 8px 22px rgba(15,23,42,.28); }
.brand__logo-img { width: 100%; height: 100%; object-fit: contain; border-radius: 9px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__cn { font-size: 17px; font-weight: 800; letter-spacing: .04em; color: #fff; transition: color var(--dur) var(--ease); }
.brand__en { font-size: 10.5px; font-weight: 600; letter-spacing: .2em; color: var(--c-text-invert-2); transition: color var(--dur) var(--ease); }
.nav.is-scrolled .brand__cn { color: var(--c-ink); }
.nav.is-scrolled .brand__en { color: var(--c-text-3); }

/* --- 主菜单 --- */
.menu { display: flex; align-items: center; gap: 4px; margin-left: 12px; }
.menu__item { position: relative; }

.menu__link {
  display: inline-flex; align-items: center; gap: 6px;
  height: var(--nav-h); padding: 0 15px;
  font-size: 15.5px; font-weight: 500;
  color: #cbd5e1;
  transition: color var(--dur) var(--ease);
}
.nav.is-scrolled .menu__link { color: var(--c-text-2); }
.menu__link:hover, .menu__item.is-open > .menu__link { color: #fff; }
.nav.is-scrolled .menu__link:hover,
.nav.is-scrolled .menu__item.is-open > .menu__link { color: var(--c-blue-deep); }

/* 当前区块高亮（scrollspy） */
.menu__link.is-active { color: #fff; }
.nav.is-scrolled .menu__link.is-active { color: var(--c-blue-deep); font-weight: 600; }
.menu__link::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 18px;
  height: 2px; border-radius: 2px;
  background: var(--g-brand);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.menu__link.is-active::after, .menu__link:hover::after { transform: scaleX(1); }

/* 下拉箭头 */
.caret {
  width: 10px; height: 10px; flex-shrink: 0;
  transition: transform var(--dur) var(--ease);
}
.menu__item.is-open .caret { transform: rotate(180deg); }

/* --- 下拉面板 --- */
.dropdown {
  position: absolute; top: calc(var(--nav-h) - 10px); left: 50%;
  min-width: 268px;
  padding: 10px;
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--c-border);
  box-shadow: var(--sh-lg);
  /* 默认收起 */
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translate(-50%, 10px) scale(.98);
  transform-origin: top center;
  transition: opacity .26s var(--ease), transform .26s var(--ease),
              visibility .26s var(--ease);
}
.menu__item.is-open > .dropdown {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translate(-50%, 0) scale(1);
}
/* 小三角 */
.dropdown::before {
  content: ""; position: absolute; top: -6px; left: 50%;
  width: 12px; height: 12px; margin-left: -6px;
  background: #fff;
  border-left: 1px solid var(--c-border);
  border-top: 1px solid var(--c-border);
  transform: rotate(45deg);
  border-radius: 2px 0 0 0;
}
/* 悬停缓冲区：避免鼠标从菜单移到面板时中断 */
.menu__item::after {
  content: ""; position: absolute; left: 0; right: 0;
  top: calc(var(--nav-h) - 14px); height: 16px;
}

.dropdown__link {
  position: relative;
  display: flex; align-items: center; gap: 11px;
  padding: 10px 13px;
  border-radius: 10px;
  font-size: 14.5px; color: var(--c-text-2);
  transition: background-color .2s var(--ease), color .2s var(--ease),
              transform .2s var(--ease);
}
.dropdown__link:hover {
  background: var(--g-brand-soft);
  color: var(--c-blue-deep);
  transform: translateX(4px);
}
.dropdown__icon {
  width: 30px; height: 30px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 9px; font-size: 15px;
  background: var(--c-bg-soft-2);
  transition: background-color .2s var(--ease);
}
.dropdown__link:hover .dropdown__icon { background: #fff; }
.dropdown__label { font-weight: 500; }

/* 导航右侧动作区 */
.nav__actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

/* 汉堡按钮 */
.hamburger {
  display: none;
  width: 42px; height: 42px; border-radius: 11px;
  align-items: center; justify-content: center;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.16);
  transition: background-color var(--dur) var(--ease);
}
.nav.is-scrolled .hamburger {
  background: var(--c-bg-soft-2);
  border-color: var(--c-border);
}
.hamburger__box { position: relative; width: 20px; height: 14px; }
.hamburger__box span {
  position: absolute; left: 0; width: 100%; height: 2px;
  border-radius: 2px; background: #e2e8f0;
  transition: transform var(--dur) var(--ease), opacity .2s var(--ease),
              background-color var(--dur) var(--ease);
}
.nav.is-scrolled .hamburger__box span { background: var(--c-ink); }
.hamburger__box span:nth-child(1) { top: 0; }
.hamburger__box span:nth-child(2) { top: 6px; }
.hamburger__box span:nth-child(3) { top: 12px; }
.hamburger.is-active .hamburger__box span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.is-active .hamburger__box span:nth-child(2) { opacity: 0; transform: scaleX(.4); }
.hamburger.is-active .hamburger__box span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }


/* ==========================================================================
   5. 移动端抽屉菜单
   ========================================================================== */
.drawer-mask {
  position: fixed; inset: 0; z-index: 98;
  background: rgba(15,23,42,.55);
  backdrop-filter: blur(3px);
  opacity: 0; visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}
.drawer-mask.is-open { opacity: 1; visibility: visible; }

.drawer {
  position: fixed; top: var(--nav-h); right: 0; bottom: 0; z-index: 99;
  width: min(360px, 88vw);
  padding: 22px 20px 40px;
  background: #fff;
  border-left: 1px solid var(--c-border);
  box-shadow: -18px 0 44px rgba(15,23,42,.16);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(102%);
  transition: transform .38s var(--ease);
}
.drawer.is-open { transform: translateX(0); }

.drawer__group + .drawer__group { border-top: 1px solid var(--c-border); }
.drawer__head {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 15px 4px;
  font-size: 16px; font-weight: 600; color: var(--c-text);
  text-align: left;
}
.drawer__head .caret { color: var(--c-text-3); }
.drawer__group.is-open .drawer__head { color: var(--c-blue-deep); }
.drawer__group.is-open .caret { transform: rotate(180deg); }

/* 折叠面板：用 grid-template-rows 实现自适应高度动画 */
.drawer__panel {
  display: grid; grid-template-rows: 0fr;
  transition: grid-template-rows .34s var(--ease);
}
.drawer__group.is-open .drawer__panel { grid-template-rows: 1fr; }
.drawer__panel > div { overflow: hidden; }

.drawer__link {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; margin-bottom: 4px;
  border-radius: 10px;
  font-size: 14.5px; color: var(--c-text-2);
  background: var(--c-bg-soft);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.drawer__link:active, .drawer__link:hover {
  background: var(--g-brand-soft); color: var(--c-blue-deep);
}
.drawer__cta { margin-top: 26px; display: grid; gap: 12px; }
.drawer__contact {
  margin-top: 24px; padding-top: 20px;
  border-top: 1px dashed var(--c-border);
  font-size: 13.5px; color: var(--c-text-3); line-height: 2;
}


/* ==========================================================================
   11. CTA 条
   ========================================================================== */
.cta-band {
  position: relative;
  padding: 76px 0;
  background: var(--g-brand);
  color: #fff; text-align: center;
  overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.09) 1px, transparent 1px);
  background-size: 44px 44px;
  animation: gridDrift 18s linear infinite;
}
.cta-band > .container { position: relative; z-index: 1; }
.cta-band__title { font-size: clamp(24px, 3vw, 36px); font-weight: 800; line-height: 1.35; }
.cta-band__desc { margin: 14px auto 0; max-width: 640px; font-size: 16px; color: rgba(255,255,255,.9); }
.cta-band__actions { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.btn--onbrand {
  color: var(--c-blue-deep); background: #fff;
  box-shadow: 0 12px 28px rgba(15,23,42,.2);
}
.btn--onbrand:hover { transform: translateY(-3px) scale(1.02); box-shadow: 0 18px 38px rgba(15,23,42,.28); }


/* ==========================================================================
   12. 页脚
   ========================================================================== */
.footer { background: var(--c-ink); color: var(--c-text-invert-2); padding: 72px 0 0; }
.footer__top {
  display: grid; grid-template-columns: 1.35fr repeat(5, minmax(0, 1fr));
  gap: 36px 28px;
  padding-bottom: 52px;
  border-bottom: 1px solid rgba(255,255,255,.09);
}
.footer__brand-desc { margin-top: 18px; font-size: 13.5px; line-height: 1.95; max-width: 300px; }
.footer__social { margin-top: 20px; display: flex; gap: 10px; }
.social {
  width: 38px; height: 38px; border-radius: 11px;
  display: grid; place-items: center; font-size: 15px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  transition: all .24s var(--ease);
}
.social:hover { transform: translateY(-4px); color: #fff; background: var(--g-brand); border-color: transparent; }

.footer__col-title {
  font-size: 15px; font-weight: 700; color: #f1f5f9; margin-bottom: 16px;
}
.footer__list { display: grid; gap: 10px; }
.footer__list a, .footer__list span {
  font-size: 13.5px; line-height: 1.7;
  transition: color .2s var(--ease), transform .2s var(--ease);
  display: inline-block;
}
.footer__list a:hover { color: #fff; transform: translateX(4px); }

.footer__bottom {
  padding: 24px 0 30px;
  display: flex; flex-wrap: wrap; gap: 10px 22px;
  align-items: center; justify-content: space-between;
  font-size: 13px;
}
.footer__legal { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer__legal a:hover { color: #fff; }
.badge-placeholder {
  padding: 3px 9px; border-radius: 5px; font-size: 12px;
  color: #94a3b8; background: rgba(255,255,255,.06);
  border: 1px dashed rgba(148,163,184,.3);
}


/* ==========================================================================
   13. 返回顶部
   ========================================================================== */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center;
  color: #fff; background: var(--g-brand);
  box-shadow: 0 12px 28px rgba(79,110,247,.42);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: all var(--dur) var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { transform: translateY(-4px) scale(1.06); }

/* 顶部滚动进度条 */
.progress {
  position: fixed; top: 0; left: 0; z-index: 101;
  height: 3px; width: 0%;
  background: var(--g-brand);
  box-shadow: 0 0 12px rgba(139,92,246,.7);
  transition: width .08s linear;
}


/* ==========================================================================
   14. 预约演示弹窗
   ========================================================================== */
.modal {
  position: fixed; inset: 0; z-index: 120;
  display: grid; place-items: center;
  padding: 24px;
  background: rgba(15,23,42,.66);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  opacity: 0; visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}
.modal.is-open { opacity: 1; visibility: visible; }
.modal__panel {
  width: min(540px, 100%);
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 34px 32px;
  border-radius: var(--r-xl);
  background: #fff;
  box-shadow: var(--sh-lg);
  transform: translateY(22px) scale(.97);
  transition: transform .38s var(--ease);
}
.modal.is-open .modal__panel { transform: translateY(0) scale(1); }
.modal__close {
  position: absolute; top: 18px; right: 18px;
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; font-size: 18px; color: var(--c-text-3);
  background: var(--c-bg-soft-2);
  transition: all .2s var(--ease);
}
.modal__close:hover { color: #fff; background: var(--c-ink); transform: rotate(90deg); }
.modal__title { font-size: 22px; font-weight: 800; }
.modal__sub { margin-top: 8px; font-size: 14px; color: var(--c-text-2); line-height: 1.8; }

.form { margin-top: 24px; display: grid; gap: 15px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.field { display: grid; gap: 7px; }
.field__label { font-size: 13.5px; font-weight: 600; color: var(--c-text-2); }
.field__label i { color: #ef4444; font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 14px;
  border-radius: 10px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-soft);
  font-size: 14.5px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease),
              background-color .2s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; background: #fff;
  border-color: var(--c-blue);
  box-shadow: 0 0 0 3px rgba(59,130,246,.16);
}
.field textarea { resize: vertical; min-height: 84px; }
.form__note { font-size: 12.5px; color: var(--c-text-3); line-height: 1.7; }

/* 轻提示 Toast */
.toast {
  position: fixed; left: 50%; bottom: 40px; z-index: 130;
  transform: translate(-50%, 22px);
  display: flex; align-items: center; gap: 10px;
  padding: 13px 22px; border-radius: 999px;
  font-size: 14.5px; font-weight: 500; color: #fff;
  background: var(--c-ink);
  box-shadow: var(--sh-lg);
  opacity: 0; visibility: hidden;
  transition: all var(--dur) var(--ease);
}
.toast.is-open { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.toast__icon {
  width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center; font-size: 12px;
  background: var(--g-brand);
}