/* ===================================
   CPF Calculator - Custom Stylesheet
   =================================== */

/* Header Styles */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0;
  transition: padding 0.3s ease-in-out;
}

.site-header .header-inner {
  transition: all 0.3s ease-in-out;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Normal State - Full Width */
.site-header.header-normal {
  padding: 0;
}

.site-header.header-normal .header-inner {
  border-radius: 0;
  border-bottom: 1px solid var(--color-border);
  box-shadow: none;
  border-left: none;
  border-right: none;
  border-top: none;
  background: rgba(255, 255, 255, 0.95);
}

/* Scrolled State - Sleek Floating Pill with Apple Glass Effect */
.site-header.header-scrolled {
  padding: 8px 16px;
}

.site-header.header-scrolled .header-inner {
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 
    0 4px 24px rgba(0, 0, 0, 0.06),
    0 1px 2px rgba(0, 0, 0, 0.04),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.08);
  max-width: 860px;
  margin: 0 auto;
}

.site-header.header-scrolled .header-inner > div {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

@media (min-width: 768px) {
  .site-header.header-scrolled {
    padding: 10px 24px;
  }
}

@media (min-width: 1024px) {
  .site-header.header-scrolled {
    padding: 10px calc(50% - 430px);
  }
  
  .site-header.header-scrolled .header-inner {
    max-width: none;
    margin: 0;
  }
}

/* Reduce header height when scrolled */
.site-header.header-scrolled .header-inner .h-16 {
  height: 3rem;
}

.site-header.header-scrolled .header-inner .md\:h-20 {
  height: 3rem;
}

/* Navigation Links */
.nav-link {
  position: relative;
  color: var(--color-body);
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.2s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  background-color: var(--color-white);
  z-index: 1001;
  transition: right 0.3s ease-in-out;
  box-shadow: -4px 0 30px rgba(0, 0, 0, 0.1);
}

.mobile-menu.menu-open {
  right: 0;
}

.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-menu-overlay.overlay-visible {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-link {
  display: block;
  padding: 16px 24px;
  color: var(--color-body);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.mobile-nav-link:hover {
  background-color: var(--color-base-100);
  color: var(--color-primary);
}

/* Hamburger Menu Button */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  cursor: pointer;
  gap: 5px;
}

.hamburger-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-body);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

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

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

/* Footer Styles */
.site-footer {
  background-color: var(--color-base-100);
  border-top: 1px solid var(--color-border);
}

.footer-heading {
  color: var(--color-heading);
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-link {
  color: var(--color-body);
  transition: color 0.2s ease;
  display: block;
  padding: 4px 0;
}

.footer-link:hover {
  color: var(--color-primary);
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-base-200);
  color: var(--color-body);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.social-icon:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* Logo Gradient */
.logo-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Utility: Body padding for fixed header */
.header-spacer {
  height: 72px;
}

@media (min-width: 768px) {
  .header-spacer {
    height: 80px;
  }
}