:root {
  --bg-base: #fcfcfc;
  --text-main: #111111;
  --text-muted: #666666;
  --text-faint: #a0a0a0;
  --accent: #2563eb; /* A refined, calm blue */
  --border-subtle: rgba(0, 0, 0, 0.06);

  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --ease-reveal: cubic-bezier(0.25, 1, 0.4, 1);
}

body {
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background-color: rgba(37, 99, 235, 0.15);
  color: var(--text-main);
}

/* Typography Utility */
.font-mono {
  font-family: var(--font-mono);
}

/* Layout */
.layout-wrapper {
  max-width: 1200px;
  margin: 0 auto;
}

.identity-panel {
  position: sticky;
  top: 5rem;
  height: calc(100vh - 10rem);
  display: flex;
  flex-direction: column;
}

.content-panel {
  padding-top: 5rem;
  padding-bottom: 8rem;
}

/* Base fade-in (JS will remove .pre-load) */
.fade-in-section {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.8s var(--ease-reveal),
    transform 0.8s var(--ease-reveal);
  will-change: opacity, transform;
}

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

/* Mobile Responsive Adjustments */
@media (max-width: 991.98px) {
  .identity-panel {
    position: relative;
    top: 0;
    height: auto;
    padding-top: 4rem;
    padding-bottom: 2rem;
  }

  .content-panel {
    padding-top: 2rem;
    padding-bottom: 4rem;
  }

  .project-header {
    flex-direction: column;
    gap: 0.25rem;
    align-items: flex-start;
  }

  .sys-footer {
    margin-top: 3rem;
  }
}

/* Micro-Typography */
.section-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin-bottom: 2rem;
}

.contact-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
  display: inline-flex;
  align-items: center;
}

.contact-link:hover {
  color: var(--text-main);
}

.contact-link::before {
  content: "→";
  margin-right: 0.5rem;
  font-family: var(--font-mono);
  opacity: 0.3;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}

.contact-link:hover::before {
  transform: translateX(3px);
  opacity: 1;
  color: var(--accent);
}

/* 
 * PROJECT LIST & HOVER SYSTEM
 */
.project-list-wrapper {
  position: relative;
  padding-left: 24px;
}

/* The moving indicator */
.active-indicator {
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0;
  background-color: var(--text-main);
  opacity: 0;
  transition:
    transform 0.3s var(--ease-reveal),
    height 0.3s var(--ease-reveal),
    opacity 0.3s ease;
  pointer-events: none;
}

.has-focus .active-indicator {
  opacity: 1;
}

.project-item {
  position: relative;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.project-item:first-child {
  border-top: 1px solid var(--border-subtle);
}

/* Dim non-hovered items when the list has focus */
.has-focus .project-item:not(.is-active) {
  opacity: 0.4;
}

/* Project Header & Title */
.project-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-main);
  margin: 0;
  display: inline-block;
  position: relative;
  /* Tracking interaction */
  letter-spacing: 0;
  transition:
    letter-spacing 0.3s var(--ease-reveal),
    color 0.3s ease;
}

/* Subtle underline grow */
.project-title::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--text-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-reveal);
}

.project-tech {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: opacity 0.3s ease;
}

/* Project Description (Hidden by default) */
.project-reveal-box {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s var(--ease-reveal);
}

.project-desc {
  overflow: hidden;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 300;
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity 0.25s var(--ease-reveal),
    transform 0.25s var(--ease-reveal);
  max-width: 90%;
}

.project-desc-inner {
  padding-top: 0.75rem; /* Only visible when grid expands */
  padding-bottom: 0.5rem;
}

/* IS-ACTIVE STATE (Triggered via JS) */
.project-item.is-active .project-title {
  letter-spacing: 0.015em;
  color: var(--text-main);
}

.project-item.is-active .project-title::after {
  transform: scaleX(1);
}

.project-item.is-active .project-reveal-box {
  grid-template-rows: 1fr;
}

.project-item.is-active .project-desc {
  opacity: 1;
  transform: translateY(0);
}

/* Environment Stack List */
.tech-inline {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 300;
}
.tech-inline span {
  color: var(--text-main);
  font-weight: 400;
}

/* Footer note */
.sys-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
  margin-top: 6rem;
  font-size: 0.75rem;
  color: var(--text-faint);
}

/* ==========================================================================
   MOBILE & RESPONSIVE ADJUSTMENTS
   ========================================================================== */

@media (max-width: 991.98px) {
  /* Release the sticky identity panel on tablet and below */
  .identity-panel {
    position: relative;
    top: auto;
    height: auto;
    padding-top: 3rem;
    padding-bottom: 2rem;
  }

  .content-panel {
    padding-top: 1.5rem;
    padding-bottom: 4rem;
  }

  /* Reduce spacing on mobile for tighter layout */
  .layout-wrapper {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  /* Projects stack vertically instead of baseline alignment */
  .project-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

@media (max-width: 767.98px) {
  /* Adjust project list wrapper to not need left padding for the indicator, 
     as we don't draw the indicator on mobile touch devices */
  .project-list-wrapper {
    padding-left: 0;
  }

  .project-title {
    font-size: 1.1rem;
  }

  .project-desc {
    max-width: 100%;
  }

  /* Hide the active indicator on mobile since we convert to click-to-expand */
  .active-indicator {
    display: none;
  }

  /* Environment stack wraps properly */
  .tech-inline {
    line-height: 1.8;
  }

  .tech-inline li {
    margin-bottom: 0.5rem;
  }

  /* Footer stacks instead of flex space-between */
  .sys-footer {
    flex-direction: column;
    align-items: flex-start !important;
    gap: 0.5rem;
  }
}