/* ============================================
   NMIMS HEADER STYLES
   ============================================ */

:root {
  --nmims-purple: #6B21C8;
  --nmims-dark: #1a1a2e;
  --nmims-gold: #8B6914;
  --header-height: 70px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Nunito Sans', sans-serif;
  padding-top: var(--header-height);
}

/* ============================================
   HEADER BASE
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: #ffffff;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transition: var(--transition);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

/* Scrolled state */
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 4px 24px rgba(107, 33, 200, 0.12);
  border-bottom-color: rgba(107, 33, 200, 0.15);
  height: 60px;
}

.header-inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  gap: 0;
}

/* ============================================
   LOGO AREA
   ============================================ */

/*
  FIX: logo-wrap has a FIXED width so layout never shifts.
  Both logos are position:absolute inside it — only opacity
  changes on scroll, not the space they occupy.
*/
.logo-wrap {
  position: relative;
  width: 220px;        /* fixed — never changes */
  height: 100%;
  flex-shrink: 0;
  text-decoration: none;
  overflow: hidden;
}

/* Default logo (full) — visible at top */
.logo-default {
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 1;
  pointer-events: auto;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Scrolled compact logo — hidden at top */
.logo-scrolled {
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(calc(-50% + 6px));   /* slightly below */
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* On scroll: swap logos — ZERO layout shift */
.site-header.scrolled .logo-default {
  opacity: 0;
  pointer-events: none;
  transform: translateY(calc(-50% - 6px));   /* slide up & fade */
}

.site-header.scrolled .logo-scrolled {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(-50%);               /* slide into place */
}

/* NMIMS Logo SVG Icon */
.logo-icon {
  width: 52px;
  height: 48px;
  flex-shrink: 0;
  transition: var(--transition);
}

.site-header.scrolled .logo-default .logo-icon {
  width: 40px;
  height: 36px;
}

.logo-text-block {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo-nmims {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 18px;
  color: #1a1a2e;
  letter-spacing: 1px;
}

.logo-nmims span {
  color: var(--nmims-purple);
}

.logo-tagline {
  font-size: 7.5px;
  font-weight: 600;
  color: #555;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-top: 2px;
}

/* Compact scrolled logo badge */
.logo-badge {
  background: var(--nmims-purple);
  color: white;
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 13px;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 1px;
}

.logo-badge-sub {
  font-size: 9px;
  font-weight: 600;
  color: #444;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ============================================
   FIND A PROGRAM BUTTON
   ============================================ */
.btn-find-program {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--nmims-purple);
  color: #fff;
  font-family: 'Nunito Sans', sans-serif;
  font-weight: 700;
  font-size: 13.5px;
  padding: 10px 18px;
  border-radius: 6px;
  text-decoration: none;
  margin-left: 20px;
  flex-shrink: 0;
  transition: var(--transition);
  white-space: nowrap;
  line-height: 1.3;
}

.btn-find-program:hover {
  background: #5a18aa;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(107, 33, 200, 0.35);
}

.btn-find-program .btn-arrow {
  font-size: 16px;
  transition: transform 0.2s ease;
}

.btn-find-program:hover .btn-arrow {
  transform: translateX(3px);
}

/* ============================================
   MAIN NAV
   ============================================ */
.main-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  color: #2d2d2d;
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
  background: none;
  border: none;
  font-family: 'Nunito Sans', sans-serif;
}

.nav-link:hover,
.nav-item:hover .nav-link {
  color: var(--nmims-purple);
  background: rgba(107, 33, 200, 0.06);
}

.nav-chevron {
  font-size: 10px;
  transition: transform 0.25s ease;
  opacity: 0.7;
}

.nav-item:hover .nav-chevron {
  transform: rotate(180deg);
}

/* Dropdown
   FIX: top is 100% (no gap). The visual gap is created with
   padding-top so the hover area is CONTINUOUS — cursor can
   move smoothly from nav button into the dropdown. */
.dropdown-menu {
  position: absolute;
  top: 100%;                /* flush — no gap */
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.12), 0 0 0 1px rgba(0,0,0,0.06);
  min-width: 200px;
  padding: 16px 8px 8px;   /* extra top padding = visual breathing room */
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

/* Invisible bridge: fills any sub-pixel gap between button & menu */
.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -8px;
  left: 0;
  right: 0;
  height: 8px;
}

.nav-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.dropdown-menu a {
  display: block;
  padding: 10px 14px;
  font-size: 13.5px;
  font-weight: 600;
  color: #333;
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition);
}

.dropdown-menu a:hover {
  background: rgba(107, 33, 200, 0.08);
  color: var(--nmims-purple);
  padding-left: 18px;
}

/* ============================================
   APPLICATION STATUS BUTTON
   ============================================ */
.btn-app-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 2px solid var(--nmims-purple);
  color: var(--nmims-purple);
  font-family: 'Nunito Sans', sans-serif;
  font-weight: 700;
  font-size: 13px;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  margin-left: 16px;
  flex-shrink: 0;
  transition: var(--transition);
  white-space: nowrap;
  cursor: pointer;
  background: none;
}

.btn-app-status:hover {
  background: var(--nmims-purple);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(107, 33, 200, 0.25);
}

.btn-app-status .btn-arrow {
  font-size: 15px;
  transition: transform 0.2s ease;
}

.btn-app-status:hover .btn-arrow {
  transform: translateX(3px);
}

/* ============================================
   MOBILE HAMBURGER
   ============================================ */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  transition: var(--transition);
  margin-left: auto;
  flex-shrink: 0;
}

.hamburger:hover {
  background: rgba(107, 33, 200, 0.08);
}

.hamburger span {
  display: block;
  height: 2px;
  background: #2d2d2d;
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   MOBILE NAV DRAWER
   ============================================ */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 999;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 20px 0 40px;
}

.mobile-nav.open {
  transform: translateX(0);
}

.mobile-nav-inner {
  padding: 0 20px;
}

.mobile-find-program {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--nmims-purple);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 20px;
  border-radius: 8px;
  text-decoration: none;
  margin-bottom: 24px;
  justify-content: center;
}

.mobile-nav-group {
  margin-bottom: 4px;
}

.mobile-nav-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: #1a1a2e;
  background: none;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-family: 'Nunito Sans', sans-serif;
  transition: var(--transition);
}

.mobile-nav-trigger:hover {
  background: rgba(107, 33, 200, 0.06);
  color: var(--nmims-purple);
}

.mobile-nav-trigger .chevron {
  font-size: 12px;
  transition: transform 0.25s ease;
}

.mobile-nav-trigger.active .chevron {
  transform: rotate(180deg);
}

.mobile-dropdown {
  display: none;
  padding: 4px 0 8px 16px;
}

.mobile-dropdown.open {
  display: block;
}

.mobile-dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #555;
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition);
  border-left: 2px solid #eee;
}

.mobile-dropdown a:hover {
  color: var(--nmims-purple);
  border-left-color: var(--nmims-purple);
  background: rgba(107, 33, 200, 0.04);
}

.mobile-nav-simple a {
  display: block;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: #1a1a2e;
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition);
}

.mobile-nav-simple a:hover {
  color: var(--nmims-purple);
  background: rgba(107, 33, 200, 0.06);
}

.mobile-divider {
  height: 1px;
  background: #eee;
  margin: 16px 0;
}

.mobile-app-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 2px solid var(--nmims-purple);
  color: var(--nmims-purple);
  font-weight: 700;
  font-size: 14px;
  padding: 13px 20px;
  border-radius: 8px;
  text-decoration: none;
  margin-top: 20px;
}

/* ============================================
   OVERLAY
   ============================================ */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .btn-find-program span.btn-text-2 {
    display: none;
  }
}

@media (max-width: 900px) {
  .main-nav,
  .btn-app-status {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .btn-find-program {
    margin-left: 12px;
    font-size: 12.5px;
    padding: 9px 14px;
  }
}

@media (max-width: 480px) {
  .logo-tagline {
    display: none;
  }

  .btn-find-program {
    display: none;
  }

  .header-inner {
    padding: 0 16px;
  }
}