/* Color Palette Variables (LaTeX Pre-print Editorial Theme) */
:root {
  --bg-paper: #FAF9F5;
  --bg-card: #E8E6DC;
  --bg-card-hover: rgba(232, 230, 220, 0.45);
  --color-ink: #141413;
  --color-muted: #787770;
  --color-terracotta: #D97757;
  --border-terracotta-hover: rgba(217, 119, 87, 0.25);
  --border-divider: rgba(20, 20, 19, 0.1);
  --shadow-progress: rgba(217, 119, 87, 0.3);
}

html.dark {
  --bg-paper: #2A2926;
  --bg-card: #353430;
  --bg-card-hover: rgba(53, 52, 48, 0.45);
  --color-ink: #FAF9F5;
  --color-muted: #A8A7A0;
  --color-terracotta: #E08569;
  --border-terracotta-hover: rgba(224, 133, 105, 0.25);
  --border-divider: rgba(250, 249, 245, 0.08);
  --shadow-progress: rgba(224, 133, 105, 0.4);
}

/* Smooth theme transitions */
body {
  background-color: var(--bg-paper);
  color: var(--color-ink);
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

/* Dynamic Scroll Reveal Base - Spring Pop Animation */
.scroll-reveal {
  opacity: 0;
  transform: scale(0.94) translateY(35px);
  transition: opacity 1s cubic-bezier(0.34, 1.56, 0.64, 1), transform 1s cubic-bezier(0.34, 1.56, 0.64, 1);
  backface-visibility: hidden;
}

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


/* Delay modifiers for sequential card animations */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }

/* Custom Premium Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-paper);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-terracotta);
}

/* Custom Typography Details */
html {
  scroll-behavior: smooth;
}

/* Soft transition for general hover elements */
a, button, input, textarea {
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Project row accordion styles */
.project-row {
  transition: padding 0.5s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.5s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.5s ease-out;
}

.project-row:hover {
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  background-color: var(--bg-card-hover);
  border-color: var(--border-terracotta-hover);
}

.project-details {
  max-height: 0;
  opacity: 0;
  transition: max-height 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-row:hover .project-details {
  max-height: 250px;
  opacity: 1;
}


/* Magnetic Interaction base */
.magnetic-btn {
  position: relative;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s ease, border-color 0.3s ease;
}

/* Scroll-driven text focus defaults */
.scroll-focus-text {
  opacity: 0.2;
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Progress bar shadow */
#scroll-progress {
  box-shadow: 0 1px 10px var(--shadow-progress);
}

.education-card {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}


/* Minimal Input line transitions */
.form-input {
  background: transparent;
  border: none;
  outline: none;
  transition: border-color 0.3s ease;
}

.form-input::placeholder {
  color: var(--color-muted);
}

.form-input:focus {
  border-color: var(--color-terracotta);
}

/* Active Navigation link styling */
.nav-link.active {
  color: var(--color-terracotta);
}

.nav-link.active::after {
  content: '';
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-terracotta);
  margin-top: 2px;
}

/* Collapsible Mobile Menu panel transition */
#mobile-menu {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  border-top: 1px solid transparent;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease-out, border-color 0.4s ease-out;
}

#mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
  border-color: var(--border-divider);
}

/* Hamburger SVG path transitions to form an X cross */
#mobile-menu-toggle.active #hamburger-line-1 {
  transform: translateY(5.25px) rotate(45deg);
}

#mobile-menu-toggle.active #hamburger-line-2 {
  opacity: 0;
}

#mobile-menu-toggle.active #hamburger-line-3 {
  transform: translateY(-5.25px) rotate(-45deg);
}

/* Mobile Nav Link styling */
.mobile-nav-link {
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.mobile-nav-link:hover {
  color: var(--color-terracotta);
  padding-left: 4px;
}