/* ==========================================================================
   顶部导航 · 大气版（宽屏 + 大品牌 + 强视觉）
   ========================================================================== */

/* —— 全宽顶栏 —— */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 11, 13, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 40px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

/* —— 大品牌 —— */
.nav__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav__brand .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent), 0 0 32px rgba(255, 106, 44, 0.3);
  flex-shrink: 0;
}

.nav__logo-img {
  height: 52px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
  margin-right: 6px;
  background: transparent;
  border-radius: 0;
}

.nav__brand .brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: var(--text);
  letter-spacing: 0.02em;
  line-height: 1;
}

.nav__brand .brand-en {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-left: 2px;
  padding-left: 14px;
  border-left: 1px solid var(--border);
  line-height: 1;
}

/* —— 主导航链接 —— */
.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-mute);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.01em;
  transition: all 240ms var(--ease);
  position: relative;
}

.nav__link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.nav__link.is-active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav__link.is-active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* —— 工具栏 —— */
.nav__util {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* 客户分流 */
.nav__audience {
  display: flex;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
}

.nav__audience button {
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  border: none;
  background: transparent;
  color: var(--text-mute);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 240ms var(--ease);
  letter-spacing: 0.02em;
}

.nav__audience button.is-active {
  background: var(--text);
  color: #0a0b0d;
}

.nav__audience button:hover:not(.is-active) {
  color: var(--text);
}

/* 语言切换 */
.nav__lang {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-mute);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: all 240ms var(--ease);
  cursor: pointer;
}

.nav__lang:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.04);
}

.nav__lang .globe {
  width: 14px;
  height: 14px;
  border: 1px solid currentColor;
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
}

.nav__lang .globe::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: currentColor;
}

/* CTA 按钮 */
.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #0a0b0d;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: all 300ms var(--ease);
  box-shadow: 0 4px 20px rgba(255, 106, 44, 0.35);
}

.nav__cta:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(255, 106, 44, 0.45);
}

.nav__cta .arrow {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.15);
  display: grid;
  place-items: center;
  font-size: 12px;
  transition: transform 300ms var(--ease);
}

.nav__cta:hover .arrow {
  transform: translate(1px, -1px);
}

/* 汉堡 */
.nav__burger {
  display: none;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: #2a2a2a;
  border: 2px solid rgba(255, 255, 255, 0.3);
  position: relative;
  z-index: 102;
  cursor: pointer;
  flex-shrink: 0;
}

.nav__burger span {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 3px;
  background: #ffffff;
  border-radius: 2px;
  transition: transform 400ms var(--ease), opacity 240ms var(--ease);
}

.nav__burger span:nth-child(1) { top: 11px; }
.nav__burger span:nth-child(2) { top: 19px; }
.nav__burger span:nth-child(3) { top: 27px; }

.nav.is-open .nav__burger { background: rgba(255,106,44,0.2); border-color: rgba(255,106,44,0.5); }

.nav.is-open .nav__burger span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav.is-open .nav__burger span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__burger span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 移动端 */
@media (max-width: 1024px) {
  .nav__inner { padding: 0 24px; }
  .nav__menu { gap: 4px; }
  .nav__link { padding: 8px 12px; font-size: 13px; }
  .nav__util { gap: 8px; }
  .nav__lang .lang-text { display: none; }
}

@media (max-width: 768px) {
  .nav__inner { height: 60px; padding: 0 16px; }
  .nav__menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: #111214;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 20px 20px 40px;
    gap: 4px;
    z-index: 99;
    overflow-y: auto;
  }
  .nav.is-open .nav__menu { display: flex; }
  .nav__link {
    font-size: 17px;
    padding: 16px 16px;
    color: #e0e0e0;
    font-weight: 500;
    width: 100%;
    text-align: left;
    border-radius: 8px;
  }
  .nav__link.is-active { color: #fff; background: rgba(255,106,44,0.2); }
  .nav__audience { display: none; }
  .nav__lang { display: none; }
  .nav__cta { display: none; }
  .nav__burger { display: block; }
  .nav__brand .brand-en { display: none; }
  .lang-dropdown { display: none; }

  /* 移动端语言切换 — 放进汉堡菜单内显示 */
  .nav.is-open .lang-dropdown {
    display: flex !important;
    width: 100%;
    padding: 12px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 8px;
  }
  .nav.is-open .lang-dropdown-toggle {
    width: 100%;
    justify-content: center;
    padding: 10px 20px;
    background: rgba(255,255,255,0.08);
    border-radius: 8px;
    font-size: 15px;
    color: #fff;
    border: 1px solid rgba(255,255,255,0.15);
  }
  .nav.is-open .lang-dropdown-menu {
    position: static;
    width: 100%;
    margin-top: 8px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: none;
    padding: 8px;
  }
  .nav.is-open .lang-dropdown-menu.is-open { display: block; }
  .nav.is-open .lang-dropdown-item {
    padding: 12px 16px;
    font-size: 15px;
    color: #ccc;
  }
  .nav.is-open .lang-dropdown-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
  .nav.is-open .lang-dropdown-item.is-active { color: #ff6a2c; background: rgba(255,106,44,0.1); }
}

/* ================================
   语言下拉菜单
================================ */
.lang-dropdown {
  position: relative;
}

.lang-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 180px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  display: none;
  z-index: 9999;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}

.lang-dropdown-menu.is-open {
  display: block;
}

.lang-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-mute);
  cursor: pointer;
  transition: all 200ms;
}

.lang-dropdown-item:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text);
}

.lang-dropdown-item.is-active {
  color: var(--accent);
  background: rgba(255,106,44,0.1);
}

.lang-dropdown-item .check {
  font-size: 11px;
  opacity: 0;
}

.lang-dropdown-item.is-active .check {
  opacity: 1;
}

.lang-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-mute);
  letter-spacing: 0.05em;
  cursor: pointer;
  background: transparent;
  transition: all 240ms var(--ease);
  white-space: nowrap;
}

.lang-dropdown-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(255,255,255,0.04);
}

.lang-dropdown-toggle .lang-arrow {
  font-size: 10px;
  transition: transform 200ms;
}

.lang-dropdown-toggle.is-open .lang-arrow {
  transform: rotate(180deg);
}

/* ================================
   RTL 支持
================================ */
[dir="rtl"] .nav__inner {
  flex-direction: row-reverse;
}

[dir="rtl"] .nav__brand {
  flex-direction: row-reverse;
}

[dir="rtl"] .nav__brand .brand-en {
  margin-left: 0;
  margin-right: 2px;
  padding-left: 0;
  padding-right: 14px;
  border-left: none;
  border-right: 1px solid var(--border);
}

[dir="rtl"] .nav__menu {
  flex-direction: row-reverse;
}

[dir="rtl"] .nav__link.is-active::after {
  left: auto;
  right: 50%;
  transform: translateX(50%);
}

[dir="rtl"] .nav__util {
  flex-direction: row-reverse;
}

[dir="rtl"] .nav__audience {
  flex-direction: row-reverse;
}

[dir="rtl"] .nav__cta {
  flex-direction: row-reverse;
}

[dir="rtl"] .nav__cta .arrow {
  transform: rotate(180deg);
}

[dir="rtl"] .lang-dropdown-menu {
  right: auto;
  left: 0;
}

[dir="rtl"] .lang-dropdown-item .check {
  order: -1;
}

[dir="rtl"] .lang-dropdown-item {
  flex-direction: row-reverse;
}