/* ============================================================
   YiguProto Header Stylesheet
   Primary color : #ff6601
   Font          : Arial
   ============================================================ */

:root {
  --yigu-primary: #ff6601;
  --yigu-primary-dark: #d95600;
  --yigu-black: #111111;
  --yigu-dark: #1f1f1f;
  --yigu-gray: #5f6368;
  --yigu-light: #f6f7f9;
  --yigu-border: #e6e8eb;
  --yigu-white: #ffffff;
  --yigu-font: Arial, Helvetica, sans-serif;
  --yigu-shadow: 0 4px 20px rgba(17, 17, 17, 0.08);
  --yigu-shadow-lg: 0 14px 40px rgba(17, 17, 17, 0.14);
}

/* ---------- Base (scoped to header) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--yigu-white);
  border-bottom: 1px solid var(--yigu-border);
  box-shadow: 0 2px 10px rgba(17, 17, 17, 0.04);
  font-family: var(--yigu-font);
  -webkit-font-smoothing: antialiased;
}

.site-header *,
.site-header *::before,
.site-header *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.site-header__bar {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
}

/* ---------- Logo ---------- */
.site-header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__mark {
  display: block;
}

.site-header__wordmark {
  font-family: var(--yigu-font);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.4px;
  color: var(--yigu-black);
  line-height: 1;
}

.site-header__wordmark span {
  color: var(--yigu-primary);
}

/* ---------- Nav ---------- */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.site-nav__item {
  position: relative;
}

/* Mega menu items align to the whole header bar, not to the single item */
.site-nav__item.has-mega {
  position: static;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 26px 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--yigu-dark);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__item.is-open > .site-nav__link {
  color: var(--yigu-primary);
  border-bottom-color: var(--yigu-primary);
}

.caret {
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  display: inline-block;
  transition: transform 0.2s ease;
}

.site-nav__item.is-open > .site-nav__link .caret {
  transform: rotate(225deg) translateY(-1px);
}

/* ---------- Dropdown (2-level) ---------- */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--yigu-white);
  border: 1px solid var(--yigu-border);
  border-radius: 10px;
  box-shadow: var(--yigu-shadow-lg);
  padding: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  z-index: 999;
}

.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown,
.has-dropdown.is-open .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown__list {
  list-style: none;
  display: grid;
  gap: 2px;
}

.dropdown__list a {
  display: block;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--yigu-gray);
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.18s ease, color 0.18s ease, padding-left 0.18s ease;
}

.dropdown__list a:hover,
.dropdown__list a:focus-visible {
  background: var(--yigu-light);
  color: var(--yigu-primary);
  padding-left: 16px;
}

/* ---------- Mega menu (3-level) ---------- */
.mega {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  transform: translateY(10px);
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  background: var(--yigu-white);
  border: 1px solid var(--yigu-border);
  border-radius: 12px;
  box-shadow: var(--yigu-shadow-lg);
  padding: 26px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  z-index: 999;
}

.has-mega:hover .mega,
.has-mega:focus-within .mega,
.has-mega.is-open .mega {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px 32px;
}

.mega__col {
  min-width: 0;
}

.mega__title {
  display: block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--yigu-black);
  text-decoration: none;
  padding-bottom: 8px;
  margin-bottom: 8px;
  border-bottom: 2px solid var(--yigu-primary);
}

.mega__title:hover,
.mega__title:focus-visible {
  color: var(--yigu-primary);
}

.mega__title--gap {
  margin-top: 18px;
}

.mega__subtitle {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--yigu-primary);
  margin: 12px 0 4px;
}

.mega__subtitle a {
  color: inherit;
  text-decoration: none;
}

.mega__subtitle a:hover,
.mega__subtitle a:focus-visible {
  color: var(--yigu-black);
  text-decoration: underline;
}

.mega__subtitle--gap {
  margin-top: 18px;
}

.mega__list {
  list-style: none;
  display: grid;
  gap: 2px;
}

.mega__list a {
  display: block;
  padding: 5px 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--yigu-gray);
  text-decoration: none;
  transition: color 0.16s ease, padding-left 0.16s ease;
}

.mega__list a:hover,
.mega__list a:focus-visible {
  color: var(--yigu-primary);
  padding-left: 5px;
}

.mega__footer {
  display: block;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--yigu-border);
  font-size: 14px;
  font-weight: 600;
  color: var(--yigu-primary);
  text-decoration: none;
  text-align: center;
}

.mega__footer:hover,
.mega__footer:focus-visible {
  color: var(--yigu-black);
}

/* ---------- CTA Button ---------- */
.site-nav__item--cta {
  margin-left: 10px;
}

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 8px;
  font-family: var(--yigu-font);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease, transform 0.15s ease;
  white-space: nowrap;
}

/* Button: primary bg = brand color, text = white, hover = black */
.btn--primary {
  background: var(--yigu-primary);
  color: var(--yigu-white);
  border-color: var(--yigu-primary);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--yigu-black);
  color: var(--yigu-white);
  border-color: var(--yigu-black);
  transform: translateY(-1px);
}

/* ---------- Hamburger (hidden on desktop) ---------- */
.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  background: transparent;
  border: 1px solid var(--yigu-border);
  border-radius: 8px;
  cursor: pointer;
}

.site-header__toggle span {
  display: block;
  width: 22px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--yigu-dark);
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.25s ease;
}

.site-header__toggle.is-active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}
.site-header__toggle.is-active span:nth-child(2) {
  opacity: 0;
}
.site-header__toggle.is-active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ---------- Tablet / Mobile (≤ 1080px) ---------- */
@media (max-width: 1080px) {
  .site-header__bar {
    min-height: 66px;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--yigu-white);
    border-top: 1px solid var(--yigu-border);
    box-shadow: var(--yigu-shadow-lg);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.35s ease, visibility 0.35s ease;
  }

  .site-nav.is-open {
    max-height: calc(100vh - 66px);
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 16px 24px;
  }

  .site-nav__item {
    border-bottom: 1px solid var(--yigu-border);
  }

  .site-nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 16px 4px;
    font-size: 16px;
    border-bottom: none;
  }

  .site-nav__link:hover,
  .site-nav__item.is-open > .site-nav__link {
    color: var(--yigu-primary);
    border-bottom: none;
  }

  /* Mobile & tablet: show level-1 menu only, hide submenu panels */
  .dropdown,
  .mega {
    display: none;
  }

  .caret {
    display: none;
  }

  .mega__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .mega__footer {
    margin-top: 12px;
    padding-top: 12px;
  }

  .site-nav__item--cta {
    margin: 16px 0 4px;
    border-bottom: none;
  }

  .btn--primary {
    width: 100%;
    padding: 15px 28px;
  }
}

/* ---------- Small phones (≤ 480px) ---------- */
@media (max-width: 480px) {
  .site-header__bar {
    padding: 0 16px;
  }

  .site-header__wordmark {
    font-size: 20px;
  }

  .site-header__mark {
    width: 36px;
    height: 36px;
  }
}

/* ---------- Touch tablets (wide but no hover): level-1 only ---------- */
@media (hover: none) and (pointer: coarse) {
  .dropdown,
  .mega {
    display: none;
  }

  .caret {
    display: none;
  }
}

/* ---------- Accessibility ---------- */
.site-nav__link:focus-visible,
.btn:focus-visible,
.site-header__toggle:focus-visible {
  outline: 3px solid rgba(255, 102, 1, 0.5);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .site-nav *,
  .site-header__toggle *,
  .dropdown,
  .mega {
    transition: none !important;
  }
}