/* =========================================================
   Soumyadip Ghorai — Portfolio
   Custom stylesheet (Tailwind CDN handles utility classes;
   this file holds bespoke visuals, animations & tokens)
   ========================================================= */

:root {
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

html, body {
  overflow-x: hidden;
  max-width: 100%;
}

/* ---------- Responsive section padding ----------
   Scales smoothly with viewport width instead of jumping at
   fixed breakpoints, so laptop widths (~1024-1440px) get
   proportionate breathing room instead of feeling cramped
   between the md and lg Tailwind steps. */
.section-px {
  padding-left: clamp(1.25rem, 4vw, 4.5rem);
  padding-right: clamp(1.25rem, 4vw, 4.5rem);
}

/* ---------- Editorial texture backgrounds ----------
   IMPORTANT: this must NOT use `color` + currentColor for the dot tint —
   `color` is inherited, so any child text without its own explicit
   Tailwind text-color class (headings, counters, secondary buttons)
   would silently inherit this near-transparent tint and become
   unreadable. Use a dedicated CSS variable instead so the dot color
   never leaks into text. */
.dot-grid {
  --dot-color: rgba(0,0,0,0.06);
  background-image: radial-gradient(var(--dot-color) 1px, transparent 1px);
  background-size: 28px 28px;
}
.dark .dot-grid { --dot-color: rgba(255,255,255,0.08); }

/* Thinner stroke on small screens: at mobile font sizes a 1.5px stroke is
   relatively thick against the letterforms, so adjacent counters (like the
   "i"/"e" in "Scientist") fill in and become illegible. */
.text-outline {
  -webkit-text-stroke: 1px currentColor;
  color: transparent;
}
@media (min-width: 640px) {
  .text-outline { -webkit-text-stroke: 1.5px currentColor; }
}

/* ---------- Preloader ---------- */
#preloader {
  transition: opacity 0.5s var(--ease), visibility 0.5s var(--ease);
}
#preloader.preloader-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.preloader-ring {
  animation: preloader-spin 1.4s linear infinite;
  transform-origin: 50% 50%;
}
.preloader-arc {
  stroke-dasharray: 60 220;
  stroke-dashoffset: 0;
}
@keyframes preloader-spin {
  to { transform: rotate(360deg); }
}
.preloader-mark {
  animation: preloader-pulse 1.8s var(--ease) infinite;
}
@keyframes preloader-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}
.preloader-dots span {
  animation: preloader-blink 1.4s infinite;
  opacity: 0.2;
}
.preloader-dots span:nth-child(2) { animation-delay: 0.2s; }
.preloader-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes preloader-blink {
  0%, 80%, 100% { opacity: 0.2; }
  40% { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .preloader-ring, .preloader-mark, .preloader-dots span { animation: none; }
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 90ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 180ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 270ms; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 360ms; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 450ms; }

/* ---------- Nav ---------- */
#site-header {
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.nav-link {
  position: relative;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  height: 2px;
  width: 0;
  background: currentColor;
  transition: width 0.3s var(--ease);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.nav-link.active {
  color: var(--tw-nav-active, inherit);
}

/* mobile menu */
#mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease);
}
#mobile-menu.open {
  max-height: 640px;
}

/* ---------- Theme toggle ---------- */
#theme-toggle svg {
  transition: transform 0.5s var(--ease), opacity 0.3s var(--ease);
}

/* ---------- Avatar placeholder ---------- */
.avatar-frame {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  isolation: isolate;
}
.avatar-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: conic-gradient(from 180deg, #a3e635, #16a34a, #0a0a0a, #a3e635);
  z-index: -2;
}
.avatar-frame::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: inherit;
  background: var(--avatar-bg, #0a0a0a);
  z-index: -1;
}
.avatar-initials {
  font-family: 'Big Shoulders Display', sans-serif;
  font-weight: 900;
  letter-spacing: -0.02em;
}

/* orbiting tech chips around hero avatar */
.orbit-chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- Skill radial bars ---------- */
.radial-progress circle {
  transition: stroke-dashoffset 1.2s var(--ease);
}

/* ---------- Footer social icon buttons ---------- */
.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  border: 1px solid rgba(10, 10, 10, 0.15);
  color: currentColor;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease), border-color 0.25s var(--ease);
}
.social-icon svg { width: 1.15rem; height: 1.15rem; }
.social-icon:hover,
.social-icon:focus-visible {
  background-color: #65a30d;
  border-color: #65a30d;
  color: #fff;
  transform: translateY(-2px);
}
.dark .social-icon { border-color: rgba(255, 255, 255, 0.15); }

/* ---------- Branding photo placeholders (About / Highlights) ---------- */
.brand-photo-frame { position: relative; }
.brand-photo-frame img { transition: transform 0.6s var(--ease); }
.brand-photo-frame:hover img { transform: scale(1.04); }

/* ---------- Gallery: fun animated photo grid ---------- */
.gallery-tile {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  /* No resting-state rotation here — the gallery rows are tightly aligned
     (fixed row height, big + small tiles flush edge-to-edge), and any
     baseline tilt would break that alignment. Hover keeps a small,
     playful pop instead. */
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.gallery-tile:hover,
.gallery-tile:focus-visible {
  transform: scale(1.025);
  z-index: 5;
  box-shadow: 0 20px 40px -12px rgba(0,0,0,0.35);
}
/* Parallax images: oversized (130% height) and absolutely positioned so
   script.js can slide them vertically within their cropped frame on scroll
   without ever exposing empty edges. Transform is owned by JS (scroll-driven
   translateY); only filter/opacity are left to CSS transitions. */
.gallery-tile .parallax-img {
  position: absolute;
  left: 0;
  top: -15%;
  width: 100%;
  height: 130%;
  object-fit: cover;
  filter: grayscale(0.5) saturate(1.05);
  transition: filter 0.5s var(--ease);
  will-change: transform;
}
.gallery-tile:hover .parallax-img,
.gallery-tile:focus-visible .parallax-img {
  filter: grayscale(0);
}
@media (prefers-reduced-motion: reduce) {
  .gallery-tile .parallax-img { transform: none !important; top: 0; height: 100%; }
}
.gallery-tile .tile-gradient {
  position: absolute;
  inset: 0;
  transition: transform 0.7s var(--ease);
}
.gallery-tile:hover .tile-gradient {
  transform: scale(1.08);
}
.gallery-tile .gallery-caption {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}
.gallery-tile:hover .gallery-caption,
.gallery-tile:focus-visible .gallery-caption {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .gallery-tile { transform: none !important; }
}

/* Lightbox */
#lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
  padding: 5vh 5vw;
}
#lightbox.open {
  opacity: 1;
  pointer-events: auto;
}
#lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 1rem;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  transform: scale(0.94);
  transition: transform 0.3s var(--ease);
}
#lightbox.open img {
  transform: scale(1);
}
#lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  color: #fff;
}

/* ---------- Marquee for tech arsenal strip ---------- */
.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 28s linear infinite;
  will-change: transform;
  transform: translateZ(0);
  backface-visibility: hidden;
}
.marquee-track:hover { animation-play-state: paused; }
/* Each duplicated group must never shrink/wrap — on narrow (phone) viewports
   flex items default to shrink:1, which squashes and wraps the group and
   breaks the seamless -50% loop math, making the strip look frozen. */
.marquee-track > div {
  flex: 0 0 auto;
  white-space: nowrap;
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- Utility ---------- */
.no-scrollbar::-webkit-scrollbar { display: none; }
.no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

::selection {
  background: #a3e635;
  color: #0a0a0a;
}

/* Focus visibility for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid #a3e635;
  outline-offset: 2px;
}