/* ============================================================
   First Frame Studio — Custom Styles
   Complements Tailwind CDN utilities
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;600;700&family=Noto+Sans+TC:wght@300;400;500;600;700&display=swap');

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

body {
  overflow-x: hidden;
}

::selection {
  background-color: rgba(255, 90, 0, 0.12);
  color: #111111b8;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Stagger Children ---------- */
.stagger>* {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.stagger.is-visible>*:nth-child(1) {
  transition-delay: 0.0s;
}

.stagger.is-visible>*:nth-child(2) {
  transition-delay: 0.1s;
}

.stagger.is-visible>*:nth-child(3) {
  transition-delay: 0.2s;
}

.stagger.is-visible>*:nth-child(4) {
  transition-delay: 0.3s;
}

.stagger.is-visible>*:nth-child(5) {
  transition-delay: 0.4s;
}

.stagger.is-visible>*:nth-child(6) {
  transition-delay: 0.5s;
}

.stagger.is-visible>* {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Nav Link Underline ---------- */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: #FF5A00;
  transition: width 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

/* ---------- Portfolio Card ---------- */
.portfolio-card .video-layer {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.portfolio-card:hover .video-layer {
  opacity: 1;
}

/* ---------- Hero Image Parallax ---------- */
.hero-parallax {
  overflow: hidden;
  will-change: transform;
}

.hero-parallax img {
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
}

/* ---------- Mobile Navigation ---------- */
.mobile-nav-overlay {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.mobile-nav-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-panel {
  transform: translateX(100%);
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ---------- Page Transition ---------- */
.page-enter {
  animation: pageEnter 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Smooth Image Loading ---------- */
img {
  opacity: 0;
  transition: opacity 0.5s ease;
}

img.loaded,
img[src=""] {
  opacity: 1;
}

/* Fallback: show images after 2s even if load event doesn't fire */
@keyframes imgFallback {
  to {
    opacity: 1;
  }
}

img {
  animation: imgFallback 0s 2s forwards;
}

/* ---------- Language Selector ---------- */
.lang-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%236E6E73' stroke-width='1.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0 center;
  padding-right: 16px;
}