/* ═══════════════════════════════════════════════════════════════════
   PORTFOLIO DESIGN SYSTEM — MINIMALIST MONOCHROME (WHITE & DARK)
   Pure vanilla CSS • Zero external dependencies • Strict contrast
   ═══════════════════════════════════════════════════════════════════ */

/* ─── CSS Variables & Design Tokens ──────────────────────────────── */
:root {
  /* Default: Dark Theme */
  --bg: #09090b;
  --bg-subtle: #121215;
  --surface: #121215;
  --surface-hover: #18181b;
  --border: #27272a;
  --border-focus: #f4f4f5;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --text-dim: #71717a;
  --accent: #f4f4f5;
  --accent-inv: #09090b;
  --tag-bg: #1c1c21;
  --tag-text: #d4d4d8;
  --tag-border: #27272a;
  --status-green: #10b981;
  --status-red: #ef4444;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, monospace;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-smooth: 0.35s var(--ease-out-expo);
  --transition-bounce: 0.3s var(--ease-spring);
}

/* Light Theme (White Mode) */
:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-subtle: #f8f8fa;
  --surface: #ffffff;
  --surface-hover: #f4f4f6;
  --border: #e4e4e7;
  --border-focus: #09090b;
  --text: #09090b;
  --text-muted: #52525b;
  --text-dim: #71717a;
  --accent: #09090b;
  --accent-inv: #ffffff;
  --tag-bg: #f4f4f5;
  --tag-text: #27272a;
  --tag-border: #e4e4e7;
  --status-green: #059669;
  --status-red: #dc2626;
}

/* ─── Global Reset & Base Elements ─────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: dark;
}

html[data-theme="light"] {
  color-scheme: light;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  opacity: 0;
  transition: opacity 0.22s var(--ease-out-expo), 
              background-color 0.35s ease, 
              color 0.35s ease, 
              border-color 0.35s ease;
}

body.page-loaded {
  opacity: 1;
}

body.page-exiting {
  opacity: 0;
  transition: opacity 0.15s var(--ease-out-expo);
}

/* ─── Page Transitions & Staggered Entrance Motion ─────────────────── */
.page-transition {
  transition: opacity 0.25s var(--ease-out-expo), transform 0.25s var(--ease-out-expo);
}

/* 5-stop rich vertical + fade entrance */
@keyframes enterFadeUpRich {
  0% {
    opacity: 0;
    transform: translateY(32px) scale(0.98);
  }
  35% {
    opacity: 0.55;
    transform: translateY(14px) scale(0.99);
  }
  65% {
    opacity: 0.88;
    transform: translateY(-2px) scale(1.002);
  }
  85% {
    opacity: 0.98;
    transform: translateY(1px);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Backward compatibility */
@keyframes enterFadeUp {
  0% {
    opacity: 0;
    transform: translateY(32px) scale(0.98);
  }
  35% {
    opacity: 0.55;
    transform: translateY(14px) scale(0.99);
  }
  65% {
    opacity: 0.88;
    transform: translateY(-2px) scale(1.002);
  }
  85% {
    opacity: 0.98;
    transform: translateY(1px);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Left-column card entrance: vertical + left glide */
@keyframes enterLeftFade {
  0% {
    opacity: 0;
    transform: translateY(38px) translateX(-20px) scale(0.97);
  }
  40% {
    opacity: 0.6;
    transform: translateY(14px) translateX(-8px) scale(0.99);
  }
  75% {
    opacity: 0.92;
    transform: translateY(-2px) translateX(2px) scale(1.002);
  }
  90% {
    opacity: 0.98;
    transform: translateY(0.5px) translateX(0);
  }
  100% {
    opacity: 1;
    transform: translateY(0) translateX(0) scale(1);
  }
}

/* Right-column card entrance: vertical + right glide */
@keyframes enterRightFade {
  0% {
    opacity: 0;
    transform: translateY(38px) translateX(20px) scale(0.97);
  }
  40% {
    opacity: 0.6;
    transform: translateY(14px) translateX(8px) scale(0.99);
  }
  75% {
    opacity: 0.92;
    transform: translateY(-2px) translateX(-2px) scale(1.002);
  }
  90% {
    opacity: 0.98;
    transform: translateY(0.5px) translateX(0);
  }
  100% {
    opacity: 1;
    transform: translateY(0) translateX(0) scale(1);
  }
}

/* Filter category transition */
@keyframes cardFilterIn {
  0% {
    opacity: 0;
    transform: translateY(24px) scale(0.96);
  }
  50% {
    opacity: 0.75;
    transform: translateY(6px) scale(0.995);
  }
  80% {
    opacity: 0.96;
    transform: translateY(-1.5px) scale(1.002);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Technical details drawer slide down */
@keyframes drawerSlideDown {
  0% {
    opacity: 0;
    transform: translateY(-12px);
  }
  60% {
    opacity: 0.85;
    transform: translateY(2px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Staggered entrance for page contents */
body.page-loaded .page-header__eyebrow {
  animation: enterFadeUpRich 0.5s var(--ease-out-expo) forwards;
}

body.page-loaded .page-header__title {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.05s both;
}

body.page-loaded .page-header__lead {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.1s both;
}

body.page-loaded .filter-bar {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.14s both;
}

/* Hero Stagger */
body.page-loaded .hero__role {
  animation: enterFadeUpRich 0.5s var(--ease-out-expo) forwards;
}

body.page-loaded .hero__h1 {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.06s both;
}

body.page-loaded .hero__statement {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.12s both;
}

body.page-loaded .hero .btn-group {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.18s both;
}

body.page-loaded .home-summary-grid {
  animation: enterFadeUpRich 0.6s var(--ease-out-expo) 0.22s both;
}

/* Card & List Staggers */
body.page-loaded .project-card:nth-child(1),
body.page-loaded .skill-group:nth-child(1),
body.page-loaded .timeline-entry:nth-child(1),
body.page-loaded .contact-channel:nth-child(1) {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.06s both;
}

body.page-loaded .project-card:nth-child(2),
body.page-loaded .skill-group:nth-child(2),
body.page-loaded .timeline-entry:nth-child(2),
body.page-loaded .contact-channel:nth-child(2) {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.12s both;
}

body.page-loaded .project-card:nth-child(3),
body.page-loaded .skill-group:nth-child(3),
body.page-loaded .timeline-entry:nth-child(3),
body.page-loaded .contact-channel:nth-child(3) {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.18s both;
}

body.page-loaded .project-card:nth-child(4),
body.page-loaded .skill-group:nth-child(4),
body.page-loaded .timeline-entry:nth-child(4) {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.24s both;
}

body.page-loaded .project-card:nth-child(5),
body.page-loaded .timeline-entry:nth-child(5) {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.3s both;
}

body.page-loaded .project-card:nth-child(6),
body.page-loaded .timeline-entry:nth-child(6) {
  animation: enterFadeUpRich 0.55s var(--ease-out-expo) 0.36s both;
}

body.page-loaded .contact-form,
body.page-loaded .availability {
  animation: enterFadeUpRich 0.6s var(--ease-out-expo) 0.16s both;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

button, input, textarea {
  font: inherit;
  color: inherit;
}

/* ─── Accessibility & Screen Reader Only ────────────────────────── */
.sr-only,
.text-rotate-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ─── Rotating Text (React Bits) ─────────────────────────────────── */
.hero__rotating-badge {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px dashed var(--border-focus);
  padding: 0 0.2rem;
  overflow: hidden;
  vertical-align: baseline;
}

.text-rotate {
  display: inline-flex;
  align-items: baseline;
  position: relative;
}

.text-rotate-word {
  display: inline-flex;
  align-items: baseline;
}

.text-rotate-element {
  display: inline-block;
  will-change: transform, opacity;
}

.text-rotate-space {
  white-space: pre;
}


/* ─── Layout Containers ───────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  flex: 1;
  padding: 3.5rem 0 5rem;
}

/* ─── Header & Persistent Navigation ──────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.site-logo {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo__mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.site-nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.35rem 0;
  position: relative;
  transition: color var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--text);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s var(--ease-out-expo);
}

.site-nav__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-nav__link.active {
  color: var(--text);
  font-weight: 600;
}

.site-nav__link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ─── Theme Switcher Button (Icon-Only & Animated) ────────────────── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-width: 36px;
  padding: 0;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-fast), 
              background-color var(--transition-fast), 
              transform 0.2s var(--ease-spring), 
              box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text);
  transform: translateY(-2px) scale(1.08);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

:root[data-theme="light"] .theme-toggle:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.theme-toggle:active {
  transform: scale(0.92);
}

.theme-toggle__icon,
.theme-toggle svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.4s var(--ease-spring);
}

.theme-toggle--spinning .theme-toggle__icon,
.theme-toggle--spinning svg {
  animation: themeIconSpin 0.5s var(--ease-spring) forwards;
}

@keyframes themeIconSpin {
  0% {
    transform: rotate(0deg) scale(0.85);
  }
  50% {
    transform: rotate(180deg) scale(1.15);
  }
  100% {
    transform: rotate(360deg) scale(1);
  }
}

/* ─── Top-Left to Bottom-Right Diagonal Theme Swing (View Transitions) ─ */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-new(root) {
  z-index: 2;
  animation: themeDiagonalSwing 0.42s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes themeDiagonalSwing {
  0% {
    clip-path: polygon(0 0, 0 0, 0 0);
  }
  100% {
    clip-path: polygon(0 0, 300% 0, 0 300%);
  }
}

/* ─── Typography & Page Header ────────────────────────────────────── */
.page-header {
  margin-bottom: 3rem;
}

.page-header__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.page-header__title {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 1rem;
}

.page-header__lead {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 680px;
}

/* ─── Buttons & Action Links ──────────────────────────────────────── */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 2rem;
}

.btn-press,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.18s var(--ease-spring),
              background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              box-shadow 0.2s ease,
              opacity var(--transition-fast);
  text-decoration: none;
  border: 1px solid transparent;
  user-select: none;
  will-change: transform;
}

.btn:active,
.btn-press:active {
  transform: scale(0.95);
  transition-duration: 0.06s;
}

.btn--primary {
  background-color: var(--accent);
  color: var(--accent-inv);
  border-color: var(--accent);
}

.btn--primary:hover {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

:root[data-theme="light"] .btn--primary:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn--primary:active {
  transform: scale(0.95);
}

.btn--secondary {
  background-color: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn--secondary:hover {
  border-color: var(--text);
  background-color: var(--surface-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

:root[data-theme="light"] .btn--secondary:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.btn--secondary:active {
  transform: scale(0.95);
}

/* ─── Home Page Hero ──────────────────────────────────────────────── */
.hero {
  padding: 5rem 0 6rem;
}

.hero-container {
  max-width: 1060px;
}

.hero--split {
  padding: 3rem 0 2rem;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 900px) {
  .hero--split {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 2rem 0;
  }
  .hero__visual {
    height: 520px;
    min-height: 460px;
  }
}

.hero__content {
  display: flex;
  flex-direction: column;
}

.hero__role {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.hero__h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.hero__statement {
  font-size: 1.2rem;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 700px;
  margin-bottom: 2.25rem;
}

.hero__visual {
  position: relative;
  width: 100%;
  height: 620px;
  min-height: 580px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: transparent;
  border: none;
  box-shadow: none;
  overflow: visible;
}

.lanyard-hero {
  width: 100%;
  height: 100%;
  position: relative;
  background: transparent;
  border: none;
  box-shadow: none;
  outline: none;
  overflow: visible;
}

.lanyard-hero canvas {
  width: 100% !important;
  height: 100% !important;
  display: block !important;
  background: transparent !important;
  outline: none !important;
}

.home-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border);
}

.summary-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--surface);
  transition: border-color var(--transition-fast), 
              transform 0.25s var(--ease-out-expo), 
              box-shadow 0.25s var(--ease-out-expo);
  will-change: transform;
}

.summary-card:hover {
  border-color: var(--text-muted);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

:root[data-theme="light"] .summary-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.summary-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.summary-card__text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.summary-card__link {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: color var(--transition-fast), transform 0.2s var(--ease-spring);
}

.summary-card__link:hover {
  text-decoration: underline;
  transform: translateX(3px);
}

/* ─── Projects Filter Bar & Grid ──────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.45rem 1rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: transform 0.18s var(--ease-spring),
              color var(--transition-fast),
              border-color var(--transition-fast),
              background-color var(--transition-fast),
              box-shadow var(--transition-fast);
  will-change: transform;
}

.filter-btn:hover {
  color: var(--text);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

.filter-btn:active {
  transform: scale(0.94);
  transition-duration: 0.06s;
}

.filter-btn.active, .filter-btn[aria-pressed="true"] {
  background-color: var(--accent);
  color: var(--accent-inv);
  border-color: var(--accent);
}

.projects-container {
  max-width: 860px;
}

.project-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 820px;
  margin: 0 auto;
}

.project-card {
  padding: 1.75rem 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--surface);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), 
              background-color var(--transition-fast), 
              transform 0.28s var(--ease-spring), 
              box-shadow 0.28s var(--ease-out-expo);
  will-change: transform;
  position: relative;
}

.project-card:hover {
  border-color: var(--text-muted);
  background-color: var(--surface-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
}

:root[data-theme="light"] .project-card:hover {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.07);
}

/* Left / Right Card Entrance Animations */
.project-card--left {
  animation: enterLeftFade 0.65s var(--ease-out-expo) both;
}

.project-card--right {
  animation: enterRightFade 0.65s var(--ease-out-expo) both;
}

.project-card--filter-in {
  animation: cardFilterIn 0.45s var(--ease-out-expo) both;
}

.project-card__number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  margin-bottom: 0.65rem;
}

.project-card__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.project-card__title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.25;
}

.project-card__meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.project-card__type {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: var(--accent);
  color: var(--accent-inv);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.project-card__category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.project-card__problem {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.6;
  flex-grow: 1;
}

.project-card__meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.5rem;
}

@media (max-width: 600px) {
  .project-card__meta-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
}

.project-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0;
}

.project-card__link {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.42rem 0.85rem;
  background-color: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), 
              border-color var(--transition-fast), 
              background-color var(--transition-fast), 
              transform 0.2s var(--ease-spring);
}

.project-card__link:hover {
  text-decoration: none;
  border-color: var(--accent);
  background-color: var(--accent);
  color: var(--accent-inv);
  transform: translateY(-1px);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}

.project-card__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  border-radius: var(--radius-sm);
}

/* ─── External Link Interstitial Modal ─────────────────────────────── */
.external-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: transparent;
  padding: 0;
  color: var(--text);
  max-width: 520px;
  width: calc(100% - 2rem);
  margin: auto;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.55);
}

:root[data-theme="light"] .external-dialog {
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.12);
}

.external-dialog::backdrop {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

:root[data-theme="light"] .external-dialog::backdrop {
  background: rgba(0, 0, 0, 0.35);
}

.external-dialog__card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.external-dialog__header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.external-dialog__badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.external-dialog__title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
}

.external-dialog__text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.external-dialog__target-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.external-dialog__url-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.external-dialog__url {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
  word-break: break-all;
}

.external-dialog__actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.external-dialog__actions .btn {
  font-size: 0.85rem;
  padding: 0.55rem 1.15rem;
}

/* ─── Skills Page ─────────────────────────────────────────────────── */
.skills-container {
  max-width: 1060px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

@media (max-width: 768px) {
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.skill-group {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.85rem;
  background-color: var(--surface);
  transition: border-color var(--transition-fast), 
              transform 0.25s var(--ease-out-expo), 
              box-shadow 0.25s var(--ease-out-expo);
  will-change: transform;
  display: flex;
  flex-direction: column;
}

.skill-group:hover {
  border-color: var(--text-muted);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

:root[data-theme="light"] .skill-group:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.skill-group__header {
  margin-bottom: 1.15rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.skill-group__title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0;
}

.skill-group .skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.35rem;
}

.skill-group .skill-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.skill-group:hover .skill-tag {
  border-color: var(--text-muted);
}

.skill-group__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
  margin: 0;
  padding: 0;
}

.skill-group__item {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.skill-group__item strong {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  display: inline-block;
  margin-right: 0.35rem;
}

/* ─── Experience / Timeline Page ─────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
  padding-left: 1.5rem;
  border-left: 1px solid var(--border);
  margin-left: 0.5rem;
}

.timeline-entry {
  position: relative;
}

.timeline-entry::before {
  content: '';
  position: absolute;
  left: calc(-1.5rem - 4.5px);
  top: 0.35rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg);
}

.timeline-entry__period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.timeline-entry__role {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.timeline-entry__org {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.timeline-entry__detail {
  list-style: disc;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ─── Contact Page ────────────────────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 3rem;
  align-items: start;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-channel {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  background-color: var(--surface);
  transition: border-color var(--transition-fast), 
              transform 0.25s var(--ease-out-expo), 
              box-shadow 0.25s var(--ease-out-expo);
  will-change: transform;
}

.contact-channel:hover {
  border-color: var(--text-muted);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

:root[data-theme="light"] .contact-channel:hover {
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
}

.contact-channel__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  display: block;
}

.contact-channel__value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.contact-channel__btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  text-align: left;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 600;
  transition: opacity var(--transition-fast), transform 0.15s var(--ease-spring);
}

.contact-channel__btn:hover {
  text-decoration: underline;
  transform: translateX(2px);
}

.contact-channel__btn:active {
  transform: scale(0.96);
}

.availability {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 1.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background-color: var(--surface);
}

.availability__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--status-green);
  display: inline-block;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
  animation: pulseGlow 2.4s infinite var(--ease-in-out);
}

@keyframes pulseGlow {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* ─── Contact Form ────────────────────────────────────────────────── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.form-field input,
.form-field textarea {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--text);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--border-focus);
  outline: none;
}

.form-field textarea {
  min-height: 140px;
  resize: vertical;
}

.field-error {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--status-red);
  min-height: 1rem;
}

.hp-field {
  display: none !important;
  visibility: hidden;
}

.form-submit {
  align-self: flex-start;
  padding: 0.75rem 1.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  background-color: var(--accent);
  color: var(--accent-inv);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.18s var(--ease-spring),
              opacity var(--transition-fast),
              box-shadow 0.2s ease;
  will-change: transform;
}

.form-submit:hover:not(:disabled) {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

:root[data-theme="light"] .form-submit:hover:not(:disabled) {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.form-submit:active:not(:disabled) {
  transform: scale(0.95);
  transition-duration: 0.06s;
}

.form-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-status {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  min-height: 1.2rem;
}

.form-status.success {
  color: var(--status-green);
}

.form-status.error {
  color: var(--status-red);
}

/* ─── Footer ──────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: border-color var(--transition-normal);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer__copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.site-footer__info {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.site-footer__sep {
  opacity: 0.35;
}

.site-footer__link {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.site-footer__link:hover {
  opacity: 0.75;
}

.site-footer__btn {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.site-footer__btn:hover {
  color: var(--text);
}

/* ─── Project Filter Additions ────────────────────────────────────── */
.filter-btn--ghost {
  border-style: dashed;
  margin-left: auto;
}

.filter-btn--ghost:hover {
  border-style: solid;
}

.filter-count {
  display: inline-block;
  font-size: 0.72rem;
  opacity: 0.75;
  margin-left: 0.25rem;
}

/* ─── Project Details Drawer (Dropdown) ───────────────────────────── */
.project-card__drawer {
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

.project-card__summary {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  transition: all var(--transition-fast);
}

.project-card__summary::-webkit-details-marker {
  display: none;
}

.project-card__summary:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.project-card__summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.project-card__chevron {
  display: inline-block;
  transition: transform 0.3s var(--ease-spring);
}

.project-card__drawer[open] .project-card__chevron {
  transform: rotate(180deg);
}

.project-card__expanded {
  margin-top: 1rem;
  overflow: hidden;
  animation: drawerSlideDown 0.32s var(--ease-out-expo) forwards;
  transform-origin: top;
}

.project-card__section {
  margin-bottom: 1rem;
}

.project-card__section:last-child {
  margin-bottom: 0;
}

.project-card__subtitle {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

@keyframes drawerSlideDown {
  0% {
    opacity: 0;
    transform: translateY(-8px) scaleY(0.96);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scaleY(1);
  }
}

/* ─── Keyboard Shortcuts Modal ────────────────────────────────────── */
.shortcuts-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--surface);
  color: var(--text);
  padding: 0;
  max-width: 440px;
  width: 90vw;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
}

.shortcuts-dialog[open] {
  animation: modalPop 0.28s var(--ease-spring) forwards;
}

.shortcuts-dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.shortcuts-dialog[open]::backdrop {
  animation: backdropFade 0.25s var(--ease-out-expo) forwards;
}

@keyframes modalPop {
  0% {
    opacity: 0;
    transform: translate(-50%, -46%) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes backdropFade {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.shortcuts-dialog__inner {
  padding: 1.5rem;
}

.shortcuts-dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.shortcuts-dialog__title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0;
}

.shortcuts-dialog__close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 0.25rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.shortcuts-dialog__close:hover {
  color: var(--text);
}

.shortcuts-dialog__body {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.shortcut-desc {
  font-size: 0.85rem;
}

.shortcut-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  color: var(--text);
  box-shadow: 0 1px 0 var(--border);
}

/* ─── Timeline Entry Tech Tags ────────────────────────────────────── */
.timeline-entry__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.85rem;
}

.timeline-entry__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  background-color: var(--bg-subtle);
}

/* ─── Skill Group Tags ────────────────────────────────────────────── */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  border-radius: var(--radius-sm);
}

/* ─── Responsive Media Queries ────────────────────────────────────── */
@media (max-width: 768px) {
  .site-header__inner {
    height: auto;
    padding: 1rem 0;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .site-nav {
    width: 100%;
    justify-content: space-between;
  }

  .site-nav__links {
    gap: 0.85rem;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .project-card {
    padding: 1.5rem;
  }
}

/* ─── Accessibility: Reduced Motion Support ───────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  body {
    opacity: 1 !important;
    transform: none !important;
  }
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none !important;
  }
}


/* ─── React Bits: TargetCursor Reticle ────────────────────────────── */
.target-cursor-wrapper {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 0 !important;
  height: 0 !important;
  pointer-events: none !important;
  user-select: none !important;
  -webkit-user-select: none !important;
  z-index: 2147483647 !important;
  mix-blend-mode: difference !important;
  transform: translate(-50%, -50%);
}

.target-cursor-dot,
.target-cursor-corner {
  pointer-events: none !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}

.target-cursor-dot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 4px;
  height: 4px;
  background: #ffffff !important;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  will-change: transform;
}

.target-cursor-corner {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  border: 3px solid #ffffff !important;
  will-change: transform;
}

.corner-tl {
  transform: translate(-150%, -150%);
  border-right: none !important;
  border-bottom: none !important;
}

.corner-tr {
  transform: translate(50%, -150%);
  border-left: none !important;
  border-bottom: none !important;
}

.corner-br {
  transform: translate(50%, 50%);
  border-left: none !important;
  border-top: none !important;
}

.corner-bl {
  transform: translate(-150%, 50%);
  border-right: none !important;
  border-top: none !important;
}

/* ─── React Bits: RotatingText ────────────────────────────────────── */
.text-rotate {
  display: inline-flex;
  flex-wrap: wrap;
  white-space: pre-wrap;
  position: relative;
  vertical-align: baseline;
}

.text-rotate-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-rotate-word {
  display: inline-flex;
  overflow: hidden;
  vertical-align: middle;
}

.text-rotate-lines {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.text-rotate-element {
  display: inline-block;
  will-change: transform, opacity;
}

.text-rotate-space {
  white-space: pre;
}

.hero__rotating-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.65rem;
  background-color: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0 0.35rem;
  vertical-align: middle;
  overflow: hidden;
}