/* ==========================================================================
   VEER SANGHVI - PORTFOLIO STYLESHEET
   GitHub-dark theme · Green accent · Google Fonts: Inter, JetBrains Mono
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colour palette - GitHub-dark aligned, matches the profile README SVGs */
  --clr-bg:          #0d1117;
  --clr-surface:     #161b22;
  --clr-surface-2:   #1c2129;
  --clr-border:      #30363d;
  --clr-text:        #c9d1d9;
  --clr-text-muted:  #8b949e;
  --clr-accent:        #39d353;
  --clr-accent-rgb:    57, 211, 83;
  --clr-accent-light:  #56e06d;
  --clr-accent-dim:    rgba(57, 211, 83, 0.15);
  --clr-link:        #58a6ff;
  --clr-white:       #f0f6fc;

  /* Typography */
  --font-display:  'Inter', system-ui, sans-serif;
  --font-sans:   'Inter', system-ui, sans-serif;
  --font-mono:   'JetBrains Mono', 'Courier New', monospace;

  /* Spacing scale */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2.5rem;
  --space-2xl:  4rem;
  --space-3xl:  6rem;

  /* Layout */
  --max-w:      1100px;
  --nav-h:      64px;

  /* Animation */
  --ease:       cubic-bezier(0.4, 0, 0.2, 1);
  --duration:   0.3s;
}

/* --------------------------------------------------------------------------
   2. Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
}

/* --------------------------------------------------------------------------
   3. Typography Helpers
   -------------------------------------------------------------------------- */
.section__heading {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--clr-white);
  margin-bottom: var(--space-2xl);
  position: relative;
  display: inline-block;
}

.section__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  width: 2.5rem;
  height: 3px;
  background: var(--clr-accent);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   4. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-xl);
}

.section {
  padding-block: var(--space-3xl);
}

.section--alt {
  background-color: var(--clr-surface);
}

/* --------------------------------------------------------------------------
   4b. By the Numbers
   -------------------------------------------------------------------------- */
.by-numbers__lede {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
  margin-top: -0.5rem;
  margin-bottom: var(--space-xl);
}

.by-numbers__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--clr-border);
  border: 1px solid var(--clr-border);
  border-radius: 12px;
  overflow: hidden;
}

.by-numbers__item {
  background: var(--clr-surface-2);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.by-numbers__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--clr-accent);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.by-numbers__unit {
  font-size: 0.55em;
  font-weight: 500;
  color: var(--clr-text-muted);
  margin-left: 0.3em;
}

.by-numbers__label {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

@media (max-width: 700px) {
  .by-numbers__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   5. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: background var(--duration) var(--ease),
              color var(--duration) var(--ease),
              border-color var(--duration) var(--ease),
              transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--clr-accent);
  color: var(--clr-bg);
  border: 2px solid var(--clr-accent);
}

.btn--primary:hover {
  background: var(--clr-accent-light);
  border-color: var(--clr-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(57, 211, 83, 0.35);
}

.btn--outline {
  background: transparent;
  color: var(--clr-accent);
  border: 2px solid var(--clr-accent);
}

.btn--outline:hover {
  background: var(--clr-accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(57, 211, 83, 0.2);
}

.btn__icon {
  width: 1.1em;
  height: 1.1em;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   6. Navigation
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(13, 17, 23, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}

.nav--scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

.nav__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--clr-accent);
  letter-spacing: 0.05em;
  transition: opacity var(--duration) var(--ease);
}

.nav__logo:hover {
  opacity: 0.8;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  letter-spacing: 0.02em;
  position: relative;
  transition: color var(--duration) var(--ease);
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  border-radius: 1px;
  transition: width var(--duration) var(--ease);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--clr-accent);
}

.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

/* Hamburger toggle (mobile) */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  padding: 0;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease),
              opacity var(--duration) var(--ease);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   7. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  padding-inline: var(--space-xl);
  overflow: hidden;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(57, 211, 83, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 211, 83, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 100%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin-inline: auto;
  width: 100%;
  padding-block: var(--space-3xl);
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--clr-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.hero__name {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  color: var(--clr-white);
  line-height: 1.05;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  font-weight: 300;
}

.hero__headline {
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  color: var(--clr-text);
  font-weight: 500;
  margin-bottom: var(--space-xl);
  letter-spacing: 0.01em;
}

/* Co-op availability badge */
.coop-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(57, 211, 83, 0.12);
  border: 1px solid rgba(57, 211, 83, 0.45);
  color: var(--clr-accent-light);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  border-radius: 99px;
  margin-bottom: var(--space-xl);
}

.coop-badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-accent);
  flex-shrink: 0;
  animation: badge-pulse 2s ease-in-out infinite;
}

@keyframes badge-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(var(--clr-accent-rgb), 0.6); }
  50%       { box-shadow: 0 0 0 6px rgba(var(--clr-accent-rgb), 0); }
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

/* Stats Card */
.stats-card {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: 12px;
  overflow: hidden;
}

.stats-card__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-xl);
  gap: 0.2rem;
}

.stats-card__number {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--clr-accent);
  line-height: 1;
}

.stats-card__label {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.04em;
  text-align: center;
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.stats-card__divider {
  width: 1px;
  background: var(--clr-border);
  align-self: stretch;
  margin-block: var(--space-md);
}

/* --------------------------------------------------------------------------
   8. About Section
   -------------------------------------------------------------------------- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about__bio p {
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.about__bio p:last-child {
  margin-bottom: 0;
}

.skills__heading {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.skill-item__header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.skill-item__name {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--clr-text);
}

.skill-item__pct {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--clr-accent);
}

.skill-bar {
  height: 6px;
  background: var(--clr-border);
  border-radius: 99px;
  overflow: hidden;
}

.skill-bar__fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent-light));
  border-radius: 99px;
  transition: width 1s var(--ease);
}

/* Categorised skill tags (replaces progress bars) */
.skills__categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.skills__category {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.skills__cat-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin: 0;
}

.skills__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-tag {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--clr-text);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  padding: 0.2rem 0.65rem;
  border-radius: 99px;
  transition: border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.skill-tag:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent-light);
}

/* --------------------------------------------------------------------------
   9. Projects Section
   -------------------------------------------------------------------------- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  border-color: var(--clr-accent);
}

/* Image area */
.project-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--clr-surface);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.project-card:hover .project-card__image img {
  transform: scale(1.05);
}

/* X-FLEX preview - zoom out so the full model fits within the card */
[data-project-id="xflex"] .project-card__image img {
  object-fit: contain;
  transform: scale(0.9);
}

[data-project-id="xflex"]:hover .project-card__image img {
  transform: scale(0.95);
}

/* Wobbler preview: show the whole engine, not an enlarged crop */
[data-project-id="wobbler"] .project-card__image img {
  object-fit: contain;
  transform: scale(0.9);
}

[data-project-id="wobbler"]:hover .project-card__image img {
  transform: scale(0.95);
}

/* Figure-based and terminal card tiles: show the whole image, no crop */
[data-project-id="guzzler"] .project-card__image img,
[data-project-id="restock"] .project-card__image img {
  object-fit: contain;
}

/* Video variant of project card image */
.project-card__image--video {
  background: #000;
}

.project-card__image--video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.project-card:hover .project-card__image--video video {
  transform: scale(1.05);
}

/* Placeholder shown when image fails to load */
.project-card__image--placeholder {
  position: relative;
}

.project-card__image--placeholder::after {
  content: '[ Project Image ]';
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.08em;
}

/* Hide the broken img element inside placeholder */
.project-card__image--placeholder img {
  display: none;
}

/* Blank preview - no image or video available (e.g. NDA projects) */
.project-card__image--blank {
  background: var(--clr-surface-2);
}

.project-card__image--codex {
  background: linear-gradient(135deg, #070d1a 0%, #0c1525 50%, #07101f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.codex-card-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}

.codex-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.28);
  padding: 3px 10px;
  border-radius: 20px;
}

.codex-count {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--clr-text);
  font-family: var(--font-sans);
}

.codex-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--clr-text-muted);
}

/* Live-simulation project cards (HEFP, IQCR) - no photo, badge instead */
.project-card__image--live {
  background: linear-gradient(135deg, #070d1a 0%, #0c1525 50%, #07101f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}

.project-card__label-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.28);
  padding: 3px 10px;
  border-radius: 20px;
}

.project-card__label-count {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--clr-text);
  font-family: var(--font-sans);
}

.project-card__label-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--clr-text-muted);
}

.project-card__body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex: 1;
}

/* Tags */
.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border: 1px solid rgba(57, 211, 83, 0.3);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--clr-white);
  line-height: 1.3;
  margin-top: var(--space-xs);
}

.project-card__desc {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 6;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card__result {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--clr-border);
  margin-top: auto;
}

.result-label {
  font-weight: 600;
  color: var(--clr-accent);
}

.project-card--in-progress .project-card__image {
  position: relative;
}

.project-card--in-progress .project-card__image::before {
  content: 'In Progress';
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--clr-accent);
  color: var(--clr-bg);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}

/* --------------------------------------------------------------------------
   10. Experience / Timeline Section
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: var(--space-2xl);
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--space-xl) / 2);
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--clr-accent) 0%,
    transparent 100%
  );
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-2xl);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

/* Gold dot */
.timeline__marker {
  position: absolute;
  left: calc(var(--space-xl) * -1 + var(--space-xs));
  top: 0.35rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-accent);
  box-shadow: 0 0 0 4px var(--clr-accent-dim);
}

.timeline__period {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--clr-accent);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.timeline__role {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--clr-white);
  margin-bottom: 0.15rem;
}

.timeline__company {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-sm);
}

.timeline__desc {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  max-width: 60ch;
}

.timeline__bullets {
  list-style: disc;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline__bullets li {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  max-width: 70ch;
}

/* --------------------------------------------------------------------------
   11. Extracurriculars Section
   -------------------------------------------------------------------------- */
.extra__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-xl);
}

.extra__card {
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: 12px;
  padding: var(--space-lg);
}

.extra__card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--clr-white);
  margin-bottom: var(--space-md);
}

.extra__list {
  list-style: disc;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.extra__list li {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. Contact Section
   -------------------------------------------------------------------------- */
.contact {
  text-align: center;
}

.contact .section__heading::after {
  left: 50%;
  transform: translateX(-50%);
}

.contact__sub {
  color: var(--clr-text-muted);
  font-size: 1.0625rem;
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
  line-height: 1.8;
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--clr-surface-2);
  border-top: 1px solid var(--clr-border);
  padding-block: var(--space-xl);
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   14. Scroll-reveal Utility
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Stagger reveal timing for items that sit side-by-side in a grid */
.projects__grid .reveal:nth-child(1) { transition-delay: 0s; }
.projects__grid .reveal:nth-child(2) { transition-delay: 0.08s; }
.projects__grid .reveal:nth-child(3) { transition-delay: 0.16s; }
.projects__grid .reveal:nth-child(4) { transition-delay: 0.24s; }
.projects__grid .reveal:nth-child(5) { transition-delay: 0.32s; }

.extra__grid .reveal:nth-child(1) { transition-delay: 0s; }
.extra__grid .reveal:nth-child(2) { transition-delay: 0.08s; }
.extra__grid .reveal:nth-child(3) { transition-delay: 0.16s; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --------------------------------------------------------------------------
   15. Responsive - Tablet (≤ 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--clr-surface);
    border-bottom: 1px solid var(--clr-border);
    padding: var(--space-xl);
    gap: var(--space-xl);
    transform: translateY(-110%);
    transition: transform var(--duration) var(--ease);
    z-index: 999;
  }

  .nav__links.open {
    transform: translateY(0);
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .stats-card {
    width: 100%;
    flex-wrap: wrap;
  }

  .stats-card__item {
    flex: 1 1 calc(50% - 2px);
  }

  .stats-card__divider {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   16. Responsive - Mobile (≤ 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-md);
  }

  .hero {
    padding-inline: var(--space-md);
  }

  .hero__name {
    font-size: clamp(2.2rem, 11vw, 3.5rem);
  }

  .projects__grid {
    grid-template-columns: 1fr;
  }

  .contact__links {
    flex-direction: column;
    align-items: center;
  }

  .timeline {
    padding-left: var(--space-xl);
  }

  .timeline::before {
    left: calc(var(--space-lg) / 2);
  }

  .timeline__marker {
    left: calc(var(--space-xl) * -1 + var(--space-sm));
  }
}

/* --------------------------------------------------------------------------
   15. Project card - interactive / view-details affordance
   -------------------------------------------------------------------------- */
.project-card {
  cursor: pointer;
}

.project-card__repo-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-accent);
  text-decoration: none;
  transition: opacity var(--duration) var(--ease);
}

.project-card__repo-link:hover {
  opacity: 0.75;
}

/* Row of multiple external links on one card (e.g. live demo + repo) */
.project-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.project-card__links .project-card__repo-link {
  margin-top: 0;
}

.project-card__view-btn {
  display: inline-block;
  margin-top: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--duration) var(--ease),
              transform var(--duration) var(--ease),
              color var(--duration) var(--ease);
}

.project-card:hover .project-card__view-btn,
.project-card:focus-visible .project-card__view-btn {
  opacity: 1;
  transform: translateX(0);
}

.project-card:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   16. Project Modal
   -------------------------------------------------------------------------- */
.pmodal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.pmodal[hidden] {
  display: none;
}

.pmodal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  cursor: pointer;
}

.pmodal__dialog {
  position: relative;
  z-index: 1;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: 16px;
  width: 100%;
  max-width: 960px;
  max-height: calc(100vh - 2 * var(--space-md));
  overflow-y: auto;
  animation: pmodal-in 0.25s var(--ease) both;
}

@keyframes pmodal-in {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)   scale(1);    }
}

.pmodal__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 2;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50%;
  color: var(--clr-text-muted);
  transition: color var(--duration) var(--ease),
              border-color var(--duration) var(--ease),
              background var(--duration) var(--ease);
}

.pmodal__close:hover,
.pmodal__close:focus-visible {
  color: var(--clr-white);
  border-color: var(--clr-accent);
  background: var(--clr-surface-2);
  outline: none;
}

.pmodal__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

/* When gallery is hidden, expand info column to full width */
.pmodal__body > .pmodal__gallery[hidden] {
  display: none;
}

.pmodal__body > .pmodal__gallery[hidden] ~ .pmodal__content {
  grid-column: 1 / -1;
  border-left: none;
}

/* Gallery column */
.pmodal__gallery {
  padding: var(--space-xl) var(--space-lg) var(--space-lg) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  border-right: 1px solid var(--clr-border);
}

.pmodal__media-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--clr-surface);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pmodal__media-wrap img,
.pmodal__media-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pmodal__gallery-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  justify-content: center;
}

.pmodal__nav-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50%;
  color: var(--clr-text-muted);
  font-size: 1rem;
  transition: color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

.pmodal__nav-btn:hover,
.pmodal__nav-btn:focus-visible {
  color: var(--clr-accent);
  border-color: var(--clr-accent);
  outline: none;
}

.pmodal__counter {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.08em;
  min-width: 40px;
  text-align: center;
}

.pmodal__caption {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
  text-align: center;
  min-height: 2.4em;
}

.pmodal__thumbs {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: center;
}

.pmodal__thumb {
  width: 56px;
  height: 42px;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  background: var(--clr-surface);
  flex-shrink: 0;
  transition: border-color var(--duration) var(--ease);
}

.pmodal__thumb img,
.pmodal__thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.pmodal__thumb--active {
  border-color: var(--clr-accent);
}

.pmodal__thumb--video {
  position: relative;
}

.pmodal__thumb--video::after {
  content: '▶';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  color: var(--clr-white);
  background: rgba(0,0,0,0.4);
  border-radius: 4px;
}

/* Info column */
.pmodal__content {
  padding: var(--space-xl) var(--space-xl) var(--space-lg) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.pmodal__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.pmodal__title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--clr-white);
  line-height: 1.3;
  padding-right: var(--space-2xl); /* avoid overlap with close btn */
}

.pmodal__desc {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.8;
  flex: 1;
}

.pmodal__result {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--clr-border);
}

.pmodal__external-link {
  margin-top: var(--space-md);
  align-self: flex-start;
}

.pmodal__apps {
  margin-bottom: var(--space-md);
}

.pmodal__apps-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-sm);
}

.pmodal__apps-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.pmodal__app-tile {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  align-items: start;
  padding: 8px 10px;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: 6px;
  text-decoration: none;
  transition: border-color var(--duration) var(--ease);
}

.pmodal__app-tile:hover {
  border-color: rgba(var(--clr-accent-rgb), 0.5);
}

.pmodal__app-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clr-text);
  grid-column: 1;
  grid-row: 1;
}

.pmodal__app-tagline {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--clr-accent);
  grid-column: 1;
  grid-row: 2;
}

.pmodal__app-arrow {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  grid-column: 2;
  grid-row: 1;
  align-self: center;
  padding-left: 4px;
}

/* Responsive: stack gallery above content on narrow screens */
@media (max-width: 640px) {
  .pmodal__body {
    grid-template-columns: 1fr;
  }

  .pmodal__apps-grid {
    grid-template-columns: 1fr;
  }

  .pmodal__gallery {
    padding: var(--space-lg) var(--space-lg) var(--space-sm);
    border-right: none;
    border-bottom: 1px solid var(--clr-border);
  }

  .pmodal__content {
    padding: var(--space-lg);
  }

  .pmodal__title {
    padding-right: 0;
  }
}

/* --------------------------------------------------------------------------
   19. Linear-style type overrides (display font is now Inter; headings need
   explicit weight and tighter tracking that the serif carried implicitly)
   -------------------------------------------------------------------------- */
.section__heading,
.nav__logo,
.stats-card__number,
.project-card__title,
.timeline__role,
.extra__card-title,
.pmodal__title {
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero__name {
  font-weight: 700;
  letter-spacing: -0.03em;
}

.btn--primary:hover,
.btn--outline:hover {
  transform: none;
  box-shadow: none;
}