/* =========================================================
   custom.css — Portfolio site custom styles
   Jatin Sikka | jatinsikka.me
   Dark mode default, light mode toggle
   ========================================================= */

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

/* ----- Design Tokens ----- */
:root {
  /* Dark mode (default) */
  --bg:            #0B0B10;
  --card-bg:       #1E1E23;
  --card-fg:       #F8FAFC;
  --muted-bg:      #232328;
  --muted-fg:      #94A3B8;
  --border:        #1E293B;
  --text:          #F8FAFC;

  /* Accent */
  --accent:        #3B82F6;
  --cta:           #F97316;

  /* Status */
  --status-active:    #22C55E;
  --status-exploring: #F59E0B;
  --status-shipped:   #6366F1;

  /* Transition speed */
  --transition: 0.3s ease;
}

html.light {
  --bg:       #F8FAFC;
  --card-bg:  #FFFFFF;
  --card-fg:  #1E293B;
  --muted-bg: #F1F5F9;
  --muted-fg: #64748B;
  --border:   #E2E8F0;
  --text:     #1E293B;
}

/* ----- Theme Transitions ----- */
*,
*::before,
*::after {
  transition:
    background-color var(--transition),
    color           var(--transition),
    border-color    var(--transition);
}

/* Don't animate transforms/opacity via theme transition — those have their own rules */
* {
  box-sizing: border-box;
}

/* ----- Base ----- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'DM Sans', system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', system-ui, sans-serif;
}

/* ----- Custom Scrollbar (dark mode) ----- */
html:not(.light) {
  scrollbar-width: thin;
  scrollbar-color: var(--muted-fg) var(--muted-bg);
}

html:not(.light)::-webkit-scrollbar {
  width: 6px;
}

html:not(.light)::-webkit-scrollbar-track {
  background: var(--muted-bg);
}

html:not(.light)::-webkit-scrollbar-thumb {
  background-color: var(--border);
  border-radius: 3px;
}

html:not(.light)::-webkit-scrollbar-thumb:hover {
  background-color: var(--muted-fg);
}

/* ----- Scroll Fade-In Animation ----- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity  0.6s ease,
    transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for grouped children */
.fade-in:nth-child(1) { transition-delay: 0s;    }
.fade-in:nth-child(2) { transition-delay: 0.08s; }
.fade-in:nth-child(3) { transition-delay: 0.16s; }
.fade-in:nth-child(4) { transition-delay: 0.24s; }
.fade-in:nth-child(5) { transition-delay: 0.32s; }
.fade-in:nth-child(6) { transition-delay: 0.40s; }

/* ----- Card Hover Lift ----- */
.card-hover {
  transition:
    transform  0.25s ease,
    box-shadow 0.25s ease,
    background-color var(--transition),
    border-color     var(--transition);
  will-change: transform;
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow:
    0 12px 32px rgba(0, 0, 0, 0.35),
    0 2px  8px  rgba(0, 0, 0, 0.20);
}

html.light .card-hover:hover {
  box-shadow:
    0 12px 32px rgba(0, 0, 0, 0.10),
    0 2px  8px  rgba(0, 0, 0, 0.06);
}

/* ----- Status Badges ----- */
.badge-active,
.badge-exploring,
.badge-shipped {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.70rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  border-width: 1px;
  border-style: solid;
}

/* dot indicator */
.badge-active::before,
.badge-exploring::before,
.badge-shipped::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.badge-active {
  color:            var(--status-active);
  background-color: rgba(34, 197, 94, 0.12);
  border-color:     rgba(34, 197, 94, 0.30);
}
.badge-active::before {
  background-color: var(--status-active);
  box-shadow: 0 0 6px var(--status-active);
}

.badge-exploring {
  color:            var(--status-exploring);
  background-color: rgba(245, 158, 11, 0.12);
  border-color:     rgba(245, 158, 11, 0.30);
}
.badge-exploring::before {
  background-color: var(--status-exploring);
}

.badge-shipped {
  color:            var(--status-shipped);
  background-color: rgba(99, 102, 241, 0.12);
  border-color:     rgba(99, 102, 241, 0.30);
}
.badge-shipped::before {
  background-color: var(--status-shipped);
}

/* ----- Mobile Menu Overlay ----- */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(80vw, 320px);
  background-color: var(--card-bg);
  border-left: 1px solid var(--border);
  z-index: 50;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  overflow-y: auto;
}

.mobile-menu.open {
  transform: translateX(0);
}

/* Scrim behind mobile menu */
.mobile-menu-scrim {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.55);
  z-index: 49;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-menu-scrim.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ----- Project Modal Overlay ----- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-panel {
  background-color: var(--card-bg);
  color: var(--card-fg);
  border: 1px solid var(--border);
  border-radius: 1rem;
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(8px);
  transition:
    transform 0.25s ease,
    opacity   0.25s ease;
  opacity: 0;
}

.modal-overlay.open .modal-panel {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* ----- Accent & CTA helpers ----- */
.text-accent { color: var(--accent); }
.text-cta    { color: var(--cta);    }
.bg-accent   { background-color: var(--accent); }
.bg-cta      { background-color: var(--cta);    }

.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--cta);
  color: #fff;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  padding: 0.6rem 1.4rem;
  border-radius: 0.5rem;
  text-decoration: none;
  transition:
    background-color 0.2s ease,
    transform        0.2s ease,
    box-shadow       0.2s ease;
}

.btn-cta:hover {
  background-color: #ea6c10;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.35);
}

/* ----- Research Interest Pill Hover ----- */
.research-pill {
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.research-pill:hover {
  border-color: var(--accent) !important;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.15);
}

.research-pill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.06), transparent);
  transition: left 0.5s ease;
}

.research-pill:hover::after {
  left: 100%;
}

html.light .research-pill:hover {
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.1);
}

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

  .fade-in {
    opacity: 1;
    transform: none;
  }

  .card-hover:hover {
    transform: none;
  }

  .mobile-menu {
    transition: none;
  }

  .modal-overlay,
  .modal-panel {
    transition: none;
  }
}