/* ═══════════════════════════════════════════════════════════
   NAV
   Single markup, three layouts. Mobile-first.

   HTML structure this CSS expects:
   ┌─ <nav class="nav">
   │  ├─ <div class="container nav__inner">
   │  │  ├─ <a class="nav__logo">
   │  │  ├─ <ul class="nav__menu" id="nav-menu">
   │  │  │  ├─ <li class="nav__item nav__item--has-dropdown">
   │  │  │  │  ├─ <button class="nav__link" aria-expanded>About</button>
   │  │  │  │  └─ <ul class="nav__dropdown">
   │  │  │  │     ├─ <li><a class="nav__dropdown-link">
   │  │  │  ├─ <li class="nav__item">
   │  │  │  │  └─ <a class="nav__link">Sponsorship</a>
   │  │  │  ├─ <li class="nav__item">
   │  │  │  │  └─ <a class="nav__link nav__link--btn">Contact Us</a>
   │  │  │  └─ <li class="nav__social-item">   ← social icons, visible only on mobile
   │  │  ├─ <div class="nav__social">           ← social icons, visible only on desktop
   │  │  └─ <button class="nav__hamburger" id="nav-hamburger">

   Breakpoints:
     Base        → hamburger + full-screen menu
     ≥ 768px     → horizontal nav, dropdowns on hover/click
   ═══════════════════════════════════════════════════════════ */

/* ── Nav bar ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding-block: var(--space-sm);
  background: linear-gradient(to bottom, var(--nav-bg) 0%, transparent 100%);
  transition: transform var(--transition-speed) ease;
}

.nav--hidden {
  transform: translateY(-100%);
}

.nav__inner {
  display: flex;
  align-items: center;
}

/* ── Logo ── */
.nav__logo img {
  height: var(--nav-logo-height-mobile);
  width: auto;
}

.nav__logo:hover {
  opacity: 1;
}

@media (min-width: 768px) {
  .nav__logo img {
    height: var(--nav-logo-height);
  }
}

/* ═══════════════════════════════════════════════════════════
   MOBILE MENU  (base styles — no media query)
   ═══════════════════════════════════════════════════════════ */

/* Menu is hidden by default on mobile */
.nav__menu {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: var(--overlay-heavy);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding-left: var(--space-lg);
  gap: var(--space-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-speed) ease,
              visibility var(--transition-speed) ease;
}

.nav__menu--open {
  opacity: 1;
  visibility: visible;
}

/* Mobile nav links — large, left-aligned */
.nav__item {
  text-align: left;
}

.nav__link {
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: none;
  text-decoration: none;
  transition: opacity var(--transition-speed);
  /* Reset for <button> dropdown triggers */
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__link:hover {
  opacity: 1;
}

/* Contact Us button — styled differently on mobile */
.nav__link--btn {
  /* On mobile it looks like every other link.
     The button styling only kicks in at desktop. */
}

/* ── Mobile dropdown accordion ── */
.nav__dropdown {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-speed) ease;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav__item--open > .nav__dropdown {
  max-height: 500px;   /* Generous max — actual height is content-driven */
  padding-top: var(--space-xs);
}

.nav__dropdown-link {
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 400;
  text-decoration: none;
  transition: opacity var(--transition-speed);
  display: block;
  padding-block: 4px;
}

.nav__dropdown-link:hover {
  opacity: 0.7;
}

/* ── Dropdown chevron indicator ── */
.nav__item--has-dropdown > .nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}

.nav__item--has-dropdown > .nav__link::after {
  content: '';
  display: inline-block;
  width: 0.45em;
  height: 0.45em;
  border-right: 3.5px solid currentColor;
  border-bottom: 3.5px solid currentColor;
  transform: rotate(45deg);
  margin-bottom: 0.15em;
  transition: transform var(--transition-speed) ease;
}

.nav__item--open > .nav__link::after {
  transform: rotate(-135deg);
}

/* ── Social icons inside mobile menu ── */
.nav__social-item {
  padding-top: var(--space-sm);
}

/* ── Social icons outside menu (desktop only) — hidden on mobile ── */
.nav__social {
  display: none;
}

/* Push hamburger to the right on mobile */
.nav__hamburger {
  margin-left: auto;
}

/* ── Hamburger ── */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 200;
  flex-shrink: 0;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: none;
}

.nav__hamburger--open span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.nav__hamburger--open span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger--open span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}


/* ═══════════════════════════════════════════════════════════
   TABLET + DESKTOP  (≥ 768px)
   Menu becomes a horizontal bar. Hamburger disappears.
   Dropdowns become absolute-positioned panels.
   ═══════════════════════════════════════════════════════════ */

@media (min-width: 768px) {

  /* ── Menu becomes inline ── */
  .nav__menu {
    /* Undo the full-screen overlay */
    position: static;
    inset: auto;
    background: none;
    opacity: 1;
    visibility: visible;
    z-index: auto;

    /* Horizontal layout */
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
    margin-left: var(--space-lg);
  }

  /* ── Nav links revert to body font ── */
  .nav__link {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 600;
    letter-spacing: 0;
    text-transform: none;
  }

  /* Underline animation on hover */
  .nav__link:not(.nav__link--btn) {
    position: relative;
  }

  .nav__link:not(.nav__link--btn)::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -3px;
    width: 0;
    height: 1px;
    background: var(--color-white);
    transition: width var(--transition-speed) ease;
  }

  /* Dropdown chevron on hover */
  .nav__item--has-dropdown > .nav__link {
    display: inline-flex;
    align-items: center;
    gap: 0.3em;
  }

  .nav__item--has-dropdown > .nav__link::before {
    content: '';
    order: 1;
    width: 0.45em;
    height: 0.45em;
    border-right: 2.5px solid var(--color-white);
    border-bottom: 2.5px solid var(--color-white);
    transform: rotate(45deg);
    margin-bottom: 0.2em;
    opacity: 0;
    transition: opacity 0.2s ease;
  }

  .nav__item--has-dropdown:hover > .nav__link::before,
  .nav__item--open > .nav__link::before {
    opacity: 1;
  }

  /* Underline animation on dropdown links */
  .nav__item--has-dropdown > .nav__link::after {
    width: 0;
    height: 1px;
    border: none;
    background: var(--color-white);
    transform: none;
    position: absolute;
    left: 0;
    bottom: -3px;
    display: block;
    margin-left: 0;
  }

  .nav__link:not(.nav__link--btn):hover::after,
  .nav__item--has-dropdown:hover > .nav__link::after,
  .nav__item--open > .nav__link:not(.nav__link--btn)::after {
    width: 100%;
  }

  /* Contact Us button style */
  .nav__link--btn {
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: var(--space-xs) calc(var(--space-xs) * 2.5);
    transition: border-color var(--transition-speed),
                background var(--transition-speed),
                opacity var(--transition-speed);
  }

  .nav__link--btn:hover {
    opacity: 1;
    border-color: var(--color-white);
    background: var(--color-white);
    color: var(--color-navy);
  }

  /* ── Dropdown becomes absolute panel ── */
  .nav__item--has-dropdown {
    position: relative;
  }

  .nav__dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    padding-top: 10px;
    max-height: none;
    overflow: visible;
    text-align: left;
    /* Hidden by default via opacity/visibility, not max-height */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
  }

  /* Show dropdown on parent hover OR when JS adds --open */
  .nav__item--has-dropdown:hover > .nav__dropdown,
  .nav__item--open > .nav__dropdown {
    opacity: 1;
    visibility: visible;
    padding-top: 10px;
  }

  .nav__dropdown-link {
    display: block;
    padding: var(--space-xs) 0;
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 600;
    white-space: nowrap;
    transition: transform 0.2s ease;
  }

  .nav__dropdown-link:hover {
    opacity: 1;
    transform: translateX(5px);
  }

  /* ── Hamburger hidden ── */
  .nav__hamburger {
    display: none;
  }

  /* ── Social icons inside menu hidden, outside menu visible ── */
  .nav__social-item {
    display: none;
  }

  .nav__social {
    display: flex;
    margin-left: auto;
  }
}

/* ═══════════════════════════════════════════════════════════
   DESKTOP  (≥ 1200px)
   More breathing room.
   ═══════════════════════════════════════════════════════════ */

@media (min-width: 1200px) {
  .nav__menu {
    margin-left: 50px;
  }
}