/* ═══════════════════════════════════════════════════════
   SHARED STYLESHEET — Wei-Hsun Chen Portfolio
   Edit design tokens here to restyle the whole site.
   ═══════════════════════════════════════════════════════

   COLOR TOKENS (shadcn conventions)
   --background          page background
   --foreground          primary text / icons
   --muted               hover / subtle fill
   --muted-foreground    secondary / caption text
   --border              section dividers
   --border-subtle       button / input borders
   --card                image placeholder bg
   --ring                focus ring / hover border

   TYPOGRAPHY TOKENS
   --font-sans           all text (Plus Jakarta Sans)
   --text-body           20px — body, labels, nav, card text
   --text-heading        48px — section headings, footer CTA
   --text-display        fluid — hero headline (set per page)

   SHAPE TOKENS
   --radius              0.5rem — buttons, cards
   --radius-full         9999px — pill / badge
═══════════════════════════════════════════════════════ */

/* ─── Design Tokens — Dark (default) ─────────────────── */
:root {
  --background:       hsl(0 0% 5.9%);
  --foreground:       hsl(0 0% 98%);
  --muted:            hsl(0 0% 14.9%);
  --muted-foreground: #A3A3A3;
  --border:           hsl(0 0% 14.9%);
  --border-subtle:    hsl(0 0% 20%);
  --card:             hsl(0 0% 9%);
  --ring:             hsl(0 0% 70%);

  --radius:      0.5rem;
  --radius-full: 9999px;

  --font-sans:    'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --text-body:    20px;
  --text-heading: 48px;
  --text-display: clamp(36px, 5vw, 48px);
}

/* ─── Design Tokens — Light ──────────────────────────── */
[data-theme="light"] {
  --background:       hsl(0 0% 98%);
  --foreground:       hsl(0 0% 3.9%);
  --muted:            hsl(0 0% 93%);
  --muted-foreground: #737373;
  --border:           hsl(0 0% 89%);
  --border-subtle:    hsl(0 0% 82%);
  --card:             hsl(0 0% 96%);
  --ring:             hsl(0 0% 30%);
}

/* ─── Reset ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  background-color: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
}
a   { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ─── Button ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  background: transparent;
  color: var(--foreground);
  padding: 8px 16px;
  height: 40px;
  transition: background 150ms ease, border-color 150ms ease;
  outline: none;
  -webkit-appearance: none;
}
.btn:hover { background: var(--muted); border-color: var(--ring); }

/* ─── Ghost (icon) Button ────────────────────────────── */
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  border: none;
  background: transparent;
  color: var(--foreground);
  cursor: pointer;
  font-size: 22px;
  transition: background 150ms ease;
  outline: none;
}
.btn-ghost:hover { background: var(--muted); }
.btn-ghost .theme-icon {
  display: inline-block;
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-ghost:hover .theme-icon { transform: rotate(180deg); }

/* ─── Menu button (mobile only) ──────────────────────── */
.btn-menu {
  display: none;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--foreground);
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 8px 16px;
  height: 40px;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease;
}
.btn-menu:hover { background: var(--muted); border-color: var(--ring); }

/* ─── Badge / Social Pill ────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 6px 20px;
  height: 40px;
  background: transparent;
  color: var(--foreground);
  transition: background 150ms ease, border-color 150ms ease;
  cursor: pointer;
}
.badge:hover { background: var(--muted); border-color: var(--ring); }

/* ─── Nav Tab ─────────────────────────────────────────── */
.nav-tab {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--muted-foreground);
  padding: 8px 12px;
  height: 40px;
  border-radius: var(--radius);
  transition: color 150ms ease;
  cursor: pointer;
  text-decoration: none;
  position: relative;
  z-index: 1;
}
.nav-tab:hover,
.nav-tab.active { color: var(--foreground); }

/* ─── Nav Animated Background ────────────────────────── */
.nav-tabs-group {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-tabs-group .nav-tab { position: relative; z-index: 1; }
.nav-bg {
  position: absolute;
  background: var(--muted);
  border-radius: var(--radius);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition:
    left   180ms cubic-bezier(0.4, 0, 0.2, 1),
    width  180ms cubic-bezier(0.4, 0, 0.2, 1),
    top    180ms cubic-bezier(0.4, 0, 0.2, 1),
    height 180ms cubic-bezier(0.4, 0, 0.2, 1),
    opacity 150ms ease;
}

/* ─── Mobile Drawer ───────────────────────────────────── */
.mobile-drawer {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  background: var(--background);
  border-bottom: 1px solid var(--border);
  padding: 64px 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateY(-110%);
  opacity: 0;
  transition: transform 380ms cubic-bezier(0.4, 0, 0.2, 1),
              opacity 280ms ease;
  pointer-events: none;
}
.mobile-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.drawer-item {
  display: flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: var(--text-heading);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--foreground);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: color 150ms ease;
}
.drawer-item:last-child { border-bottom: none; }
.drawer-item:hover { color: var(--muted-foreground); }
.drawer-close {
  position: absolute;
  top: 64px; right: 40px;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--muted-foreground);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 0;
}
.drawer-close:hover { color: var(--foreground); }

/* ─── Navigation ──────────────────────────────────────── */
nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 64px 40px 0;
}
.nav-email {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  text-transform: uppercase;
  color: var(--muted-foreground);
  justify-self: start;
}
.nav-right {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ─── Divider ─────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--border); margin: 0; }

/* ─── Scroll Progress Bar ────────────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  z-index: 9999;
  pointer-events: none;
}
.scroll-progress-bar {
  height: 100%;
  width: 100%;
  background: #2563EB;
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ─── Custom Cursor ───────────────────────────────────── */
/* Only hide default cursor on non-touch (pointer: fine) devices */
@media (pointer: fine) {
  * { cursor: none !important; }
}

#custom-cursor {
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 99999;
  will-change: transform;
  opacity: 0;
  transition: opacity 200ms ease;
}
#custom-cursor.visible { opacity: 1; }

.cursor-ring {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0;
  overflow: hidden;
  transition:
    width         350ms cubic-bezier(0.34, 1.56, 0.64, 1),
    height        350ms cubic-bezier(0.34, 1.56, 0.64, 1),
    border-radius 350ms cubic-bezier(0.34, 1.56, 0.64, 1),
    padding       300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
.cursor-label {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  line-height: 16px;
  color: #0a0a0a;
  white-space: nowrap;
  opacity: 0;
  transform: scale(0.75);
  transition: opacity 180ms ease 60ms,
              transform 280ms cubic-bezier(0.34, 1.56, 0.64, 1) 60ms;
}
.cursor-icon {
  opacity: 0;
  transform: scale(0.75);
  flex-shrink: 0;
  color: #0a0a0a;
  transition: opacity 180ms ease 60ms,
              transform 280ms cubic-bezier(0.34, 1.56, 0.64, 1) 60ms;
}
#custom-cursor.is-view .cursor-ring {
  width: 68px;
  height: 32px;
  border-radius: 16px;
  padding: 8px 12px;
}
#custom-cursor.is-view .cursor-label,
#custom-cursor.is-view .cursor-icon { opacity: 1; transform: scale(1); }

/* Light-mode cursor invert */
[data-theme="light"] .cursor-ring {
  background: rgba(10, 10, 10, 0.8);
}
[data-theme="light"] .cursor-label {
  color: #fafafa;
}
[data-theme="light"] .cursor-icon {
  color: #fafafa;
}

/* ─── Carousel Lightbox ───────────────────────────────── */
#img-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9998;
  visibility: hidden;
  pointer-events: none;
  /* opacity / backdrop are JS-controlled for the morph animation */
}
#img-lightbox.open {
  visibility: visible;
  pointer-events: all;
}

#img-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  cursor: pointer;
  opacity: 0; /* always starts at 0; JS animates it */
}

/* track wrapper — clips overflowing slides */
#lb-track-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  overflow: hidden;
  pointer-events: none;
}

#lb-track {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-shrink: 0;
  will-change: transform;
  transition: transform 420ms cubic-bezier(0.4, 0, 0.2, 1);
}

.lb-slide {
  flex-shrink: 0;
  pointer-events: auto;
  cursor: pointer;
}
.lb-slide img {
  display: block;
  max-height: 80vh;
  width: 100%;
  object-fit: contain;
  border-radius: 12px;
  transition:
    opacity 380ms ease,
    filter  380ms ease,
    transform 420ms cubic-bezier(0.4, 0, 0.2, 1);
}
.lb-slide:not(.lb-active) img {
  opacity: 0.4;
  filter: brightness(0.55);
  transform: scale(0.9);
}
.lb-slide.lb-active {
  cursor: default;
}
.lb-slide.lb-active img {
  opacity: 1;
  filter: none;
  transform: scale(1);
}

#img-lightbox-close {
  position: fixed;
  top: 24px; right: 24px;
  z-index: 10000;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.75);
  transition:
    opacity   260ms ease 100ms,
    transform 320ms cubic-bezier(0.34, 1.56, 0.64, 1) 100ms,
    background 150ms ease;
}
#img-lightbox.open #img-lightbox-close { opacity: 1; transform: scale(1); }
#img-lightbox-close:hover { background: rgba(255, 255, 255, 0.24); }

/* Nav arrows — only shown for multi-image groups */
#lb-prev, #lb-next {
  position: fixed;
  top: 50%; transform: translateY(-50%);
  z-index: 10000;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 150ms ease, opacity 260ms ease;
  opacity: 0;
}
#lb-prev { left: 24px; }
#lb-next { right: 72px; }
#img-lightbox.open #lb-prev,
#img-lightbox.open #lb-next { opacity: 1; }
#lb-prev:hover, #lb-next:hover { background: rgba(255, 255, 255, 0.24); }
#lb-prev[hidden], #lb-next[hidden] { display: none; }

/* Lightbox mobile adjustments */
@media (max-width: 900px) {
  .lb-slide img { max-height: 70vh; border-radius: 8px; }
  #lb-prev { left: 12px; }
  #lb-next { right: 12px; }
  #img-lightbox-close { top: 16px; right: 16px; }
}

/* ─── Text selection ──────────────────────────────────── */
::selection { background: #000; color: #2563EB; }

/* ─── Scrollbar ───────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: 4px; }

/* ─── Footer Credit — text rotate on hover ───────────── */
.footer-credit-link {
  display: inline-block;
  overflow: hidden;
  height: 1.2em;
  line-height: 1.2;
  text-decoration: none;
  color: var(--muted-foreground);
  vertical-align: baseline;
}
.footer-credit-inner {
  display: block;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.footer-credit-link:hover .footer-credit-inner {
  transform: translateY(-50%);
}
.footer-credit-line {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 1.2em;
  line-height: 1.2;
  white-space: nowrap;
}

/* ─── Keyframe Animations ─────────────────────────────── */
@keyframes themeReveal {
  from { clip-path: inset(0 0 100% 0); }
  to   { clip-path: inset(0 0 0%   0); }
}
::view-transition-old(root) { animation: none; }
::view-transition-new(root) {
  animation: 700ms cubic-bezier(0.76, 0, 0.24, 1) both themeReveal;
}

@keyframes wordIn {
  from { opacity: 0; transform: translateY(10px); filter: blur(3px); }
  to   { opacity: 1; transform: translateY(0);    filter: blur(0);   }
}
.word {
  display: inline-block;
  opacity: 0;
  animation: wordIn 500ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes paraIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0);   }
}
.para-animate {
  opacity: 0;
  animation: paraIn 600ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes imgReveal {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0);    }
}

/* ─── Responsive — shared nav rules ──────────────────── */
@media (max-width: 900px) {
  nav { padding: 40px 20px 0; grid-template-columns: 1fr auto; }
  .nav-email { display: none; }
  .nav-tabs-group { display: none; }
  .btn-menu { display: inline-flex; justify-self: start; }
  .btn-ghost { justify-self: end; }
  .nav-right { display: contents; }
  .mobile-drawer { padding: 40px 20px 28px; }
  .drawer-close  { top: 40px; right: 20px; }
}

@media (max-width: 480px) {
  :root { --text-body: 17px; --text-heading: 36px; }
}