/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: #0A1628;
  color: #ffffff;
  font-family: 'Inter', system-ui, sans-serif;
  overflow-x: hidden;
}

::selection {
  background: rgba(0, 212, 170, 0.3);
  color: #ffffff;
}

/* ── Animations ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-fade-up {
  animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-fade-in {
  animation: fadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ── Scroll Reveal ── */
.reveal-up,
.reveal-left,
.reveal-right {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left {
  transform: translateX(-40px);
}

.reveal-right {
  transform: translateX(40px);
}

.reveal-up.visible,
.reveal-left.visible,
.reveal-right.visible {
  opacity: 1;
  transform: translateX(0) translateY(0);
}

/* ── Header ── */
#header {
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

#header.scrolled {
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #00D4AA, #E0C068);
  transition: width 0.3s ease;
  border-radius: 1px;
}

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

.nav-link:hover {
  color: #00D4AA !important;
}

/* ── Mobile Menu ── */
#mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

#mobile-menu.closed {
  opacity: 0;
  pointer-events: none;
}

.menu-line {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#menu-toggle.active .menu-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

#menu-toggle.active .menu-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

#menu-toggle.active .menu-line:nth-child(3) {
  width: 24px;
  margin-left: 0;
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-link {
  transition: color 0.3s ease, transform 0.3s ease;
}

.mobile-link:hover {
  transform: scale(1.05);
}

/* ── Buttons ── */
.btn-gold {
  background: linear-gradient(135deg, #C9A84C 0%, #E0C068 50%, #C9A84C 100%);
  background-size: 200% 200%;
  color: #0A1628;
  border: none;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: 'Inter', system-ui, sans-serif;
}

.btn-gold::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #E0C068 0%, #F0D078 50%, #E0C068 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
  border-radius: inherit;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(201, 168, 76, 0.35);
  background-position: right center;
}

.btn-gold:hover::before {
  opacity: 1;
}

.btn-gold span,
.btn-gold svg {
  position: relative;
  z-index: 1;
}

.btn-outline {
  background: transparent;
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: 'Inter', system-ui, sans-serif;
}

.btn-outline:hover {
  border-color: #00D4AA;
  color: #00D4AA;
  background: rgba(0, 212, 170, 0.05);
}

/* ── Menu Tabs ── */
.menu-tab {
  background: transparent;
  color: rgba(255, 255, 255, 0.5);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: 'Inter', system-ui, sans-serif;
}

.menu-tab:hover {
  color: rgba(255, 255, 255, 0.8);
}

.menu-tab.active {
  background: linear-gradient(135deg, #00D4AA, #00B892);
  color: #0A1628;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(0, 212, 170, 0.3);
}

.menu-content {
  animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Form ── */
#contact-form input,
#contact-form textarea {
  background: rgba(10, 22, 40, 0.6);
}

#contact-form input:focus,
#contact-form textarea:focus {
  background: rgba(10, 22, 40, 0.8);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #0A1628;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #00D4AA, #C9A84C);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #00B892, #E0C068);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .font-display {
    font-size: clamp(2rem, 8vw, 3.5rem);
  }

  #hero h1 {
    font-size: clamp(2.5rem, 10vw, 4.5rem);
  }
}