/* --------------------------------------------------------------------------
   Varun Gupta — Portfolio
   Light, soft-gradient theme. Flat cards, thin borders, subtle motion.
   -------------------------------------------------------------------------- */

:root {
  --color-primary: #4f8cff;
  --color-primary-soft: #e8f0ff;
  --color-primary-mid: #7aa8ff;
  --color-text: #1a1f2e;
  --color-text-muted: #5c6478;
  --color-border: #e5e7eb;
  --color-border-tint: rgba(79, 140, 255, 0.22);
  --color-border-strong: rgba(79, 140, 255, 0.42);
  --color-border-hover: #4f8cff;
  --color-surface: #ffffff;
  --color-bg: #f5f8ff;
  --color-bg-warm: #f0f5ff;
  --gradient-hero: linear-gradient(145deg, #f8fbff 0%, #f0f5ff 35%, #faf5ff 70%, #fff8fb 100%);
  --gradient-accent: linear-gradient(120deg, #4f8cff 0%, #8b9dff 45%, #b8a8ff 100%);
  --gradient-btn: linear-gradient(135deg, #4f8cff 0%, #6ba3ff 48%, #8eb8ff 100%);
  --gradient-btn-hover: linear-gradient(135deg, #3d7aef 0%, #5c94f5 100%);
  --gradient-section-fade: linear-gradient(180deg, rgba(245, 248, 255, 0.65) 0%, rgba(255, 255, 255, 0) 100%);
  --shadow-soft: 0 10px 36px -18px rgba(79, 140, 255, 0.22);
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px -4px rgba(15, 23, 42, 0.08);
  --shadow-card-hover: 0 8px 24px -12px rgba(79, 140, 255, 0.2);
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Poppins", var(--font-sans);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --space-section: clamp(60px, 7vw, 80px);
  --space-section-tight: clamp(48px, 5vw, 64px);
  --container: min(1160px, 92vw);
  --header-h: 64px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-surface);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: #3a6fd9;
}

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

.container {
  width: var(--container);
  margin-inline: auto;
}

/* ----- Page loader ----- */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.page-loader.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.page-loader__inner {
  display: flex;
  gap: 10px;
}

.page-loader__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: loaderBounce 0.6s ease-in-out infinite alternate;
}

.page-loader__dot:nth-child(2) {
  animation-delay: 0.15s;
  background: var(--color-primary-mid);
}

.page-loader__dot:nth-child(3) {
  animation-delay: 0.3s;
  background: #b8a8ff;
}

@keyframes loaderBounce {
  from {
    transform: translateY(0);
    opacity: 0.5;
  }
  to {
    transform: translateY(-10px);
    opacity: 1;
  }
}

/* ----- Scroll progress ----- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  z-index: 10001;
  background: var(--gradient-accent);
  transform-origin: left;
  transition: width 0.05s linear;
}

/* ----- Header / Nav ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: calc(var(--container) + 2rem);
  margin-inline: auto;
  padding: 0.75rem 1.25rem;
  min-height: var(--header-h);
}

.nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.nav__brand:hover {
  color: var(--color-primary);
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.nav__toggle:hover {
  border-color: var(--color-border-strong);
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

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

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

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

.nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__list a {
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  padding: 0.35rem 0;
  position: relative;
}

.nav__list a:not(.nav__cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav__list a:not(.nav__cta):hover {
  color: var(--color-text);
}

.nav__list a:not(.nav__cta):hover::after {
  width: 100%;
}

.nav__cta {
  padding: 0.45rem 1rem !important;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary) !important;
  font-weight: 600 !important;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition) !important;
}

.nav__cta::after {
  display: none !important;
}

.nav__cta:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

@media (max-width: 860px) {
  .nav__toggle {
    display: flex;
  }

  .nav__list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1.25rem 1.25rem;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height 0.35s ease, opacity 0.25s ease;
  }

  .nav__list.is-open {
    max-height: 420px;
    opacity: 1;
    pointer-events: auto;
  }

  .nav__list li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav__list li:last-child {
    border-bottom: none;
    padding-top: 0.5rem;
  }

  .nav__list a {
    display: block;
    padding: 0.85rem 0;
  }

  .nav__cta {
    text-align: center;
  }
}

/* ----- Sections ----- */
.section {
  position: relative;
  padding-block: var(--space-section);
}

.skills::before,
.achievements::before,
.contact::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 40px;
  background: var(--gradient-section-fade);
  pointer-events: none;
  opacity: 0.7;
}

@media (max-width: 640px) {
  .section {
    padding-block: clamp(30px, 6vw, 40px);
  }
}

.section__head {
  margin-bottom: clamp(1.35rem, 3vw, 1.85rem);
  max-width: 36rem;
}

.section__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0;
  color: var(--color-text);
}

.section__lead {
  margin: 0.65rem 0 0;
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.58;
  max-width: 40rem;
}

/* Alternating section surfaces */
.about,
.internship,
.languages {
  background: var(--color-surface);
}

.skills,
.achievements,
.contact {
  background: var(--color-bg);
}

main > .section {
  border-top: 1px solid var(--color-border);
}

main > .hero + .section {
  border-top: none;
}

/* ----- Hero ----- */
.hero {
  position: relative;
  min-height: min(78vh, 640px);
  display: flex;
  align-items: center;
  padding-block: clamp(2.5rem, 6vw, 4rem);
  padding-inline: 1.25rem;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}

.hero__bg::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(ellipse at 18% 28%, rgba(79, 140, 255, 0.16) 0%, transparent 52%),
    radial-gradient(ellipse at 82% 18%, rgba(147, 168, 255, 0.14) 0%, transparent 48%),
    radial-gradient(ellipse at 75% 78%, rgba(184, 168, 255, 0.12) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 100%, rgba(255, 182, 193, 0.09) 0%, transparent 42%);
  animation: heroGradientShift 14s ease-in-out infinite alternate;
}

.hero__bg::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 42%;
  width: min(520px, 58vw);
  height: min(520px, 58vw);
  transform: translateY(-50%);
  background: radial-gradient(circle at 35% 35%, rgba(79, 140, 255, 0.2) 0%, transparent 58%),
    radial-gradient(circle at 65% 55%, rgba(139, 157, 255, 0.16) 0%, transparent 55%);
  border-radius: 42% 58% 48% 52% / 48% 45% 55% 52%;
  filter: blur(0.5px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.95;
}

@keyframes heroGradientShift {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(3%, -2%) scale(1.05);
  }
}

.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.25rem);
  max-width: var(--container);
  margin-inline: auto;
  width: 100%;
  align-items: center;
}

@media (min-width: 900px) {
  .hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
    gap: clamp(1.25rem, 3vw, 2rem);
    align-items: center;
  }
}

.hero__content {
  max-width: 600px;
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--color-primary);
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.2vw, 2.65rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin: 0 0 1.25rem;
  color: var(--color-text);
}

.hero__divider {
  color: var(--color-text-muted);
  font-weight: 500;
  margin: 0 0.2em;
}

.hero__tagline {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 0 1.65rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.65rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn:focus-visible,
.nav__toggle:focus-visible,
.nav__brand:focus-visible,
.form-field__input:focus-visible,
.project-btn:focus-visible,
.project-basic__btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--gradient-btn);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 14px -4px rgba(79, 140, 255, 0.45), 0 2px 6px -2px rgba(79, 140, 255, 0.25);
}

.btn--primary:hover {
  background: var(--gradient-btn-hover);
  color: #fff;
  box-shadow: 0 8px 22px -6px rgba(79, 140, 255, 0.5), 0 4px 10px -4px rgba(79, 140, 255, 0.3);
}

.btn--ghost {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-card);
}

.btn--full {
  width: 100%;
}

.btn:disabled,
.btn[aria-busy="true"] {
  opacity: 0.72;
  cursor: wait;
  transform: none;
  pointer-events: none;
}

.btn--primary:disabled,
.btn--primary[aria-busy="true"] {
  filter: grayscale(0.08);
}

.hero__aside {
  justify-self: end;
  width: 100%;
  max-width: 300px;
}

@media (max-width: 899px) {
  .hero__aside {
    justify-self: center;
    max-width: 320px;
  }
}

.hero__card {
  position: relative;
  padding: 1.35rem 1.4rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.hero__card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.hero__card-inner {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-block: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.hero__card-inner:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.hero__stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.hero__stat-value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
}

.hero__accent {
  position: absolute;
  top: -1px;
  right: -1px;
  width: 64px;
  height: 64px;
  background: var(--gradient-accent);
  opacity: 0.22;
  border-radius: 0 var(--radius-md) 0 var(--radius-md);
  pointer-events: none;
}

/* ----- About ----- */
.about {
  background: var(--color-surface);
}

.about__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
  align-items: center;
}

@media (min-width: 800px) {
  .about__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.about__lead {
  font-size: 1.08rem;
  color: var(--color-text);
  margin: 0 0 1rem;
}

.about__body {
  color: var(--color-text-muted);
  margin: 0 0 1.35rem;
}

.about__edu-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.about__edu-card {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.about__edu-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.about__edu-degree {
  font-weight: 600;
  color: var(--color-text);
}

.about__edu-school {
  color: var(--color-primary);
  font-weight: 500;
  font-size: 0.95rem;
}

.about__edu-meta {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.about__visual {
  display: flex;
  justify-content: center;
}

.about__figure {
  margin: 0;
  max-width: 280px;
  width: 100%;
  text-align: center;
}

.about__photo-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  background: var(--color-bg);
  aspect-ratio: 4 / 5;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.about__visual:hover .about__photo-frame {
  border-color: rgba(79, 140, 255, 0.35);
  box-shadow: var(--shadow-card-hover);
}

.about__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 15%;
  display: block;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.about__visual:hover .about__photo {
  transform: scale(1.04);
}

.about__caption {
  margin: 0.85rem 0 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* ----- Skills ----- */
.skills__grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .skills__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.skill-card {
  padding: 1.15rem 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.skill-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
}

.skill-card__icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  font-size: 0;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.skill-card:nth-child(1) .skill-card__icon {
  color: #2563eb;
  background: #eff6ff;
  border-color: #bfdbfe;
}

.skill-card:nth-child(2) .skill-card__icon {
  color: #7c3aed;
  background: #f5f3ff;
  border-color: #ddd6fe;
}

.skill-card:nth-child(3) .skill-card__icon {
  color: #059669;
  background: #ecfdf5;
  border-color: #a7f3d0;
}

.skill-card:nth-child(4) .skill-card__icon {
  color: #d97706;
  background: #fffbeb;
  border-color: #fde68a;
}

.skill-card:nth-child(5) .skill-card__icon {
  color: #64748b;
  background: #f8fafc;
  border-color: #e2e8f0;
}

.skill-card:hover .skill-card__icon {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.skill-card__title {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 600;
  margin: 0 0 0.65rem;
}

.skill-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.skill-card__list li {
  font-size: 0.88rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(79, 140, 255, 0.15);
  background: var(--color-bg);
  color: var(--color-text-muted);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.skill-card:hover .skill-card__list li {
  border-color: rgba(79, 140, 255, 0.28);
  color: var(--color-text);
}

/* ----- Projects ----- */
.projects {
  background: linear-gradient(180deg, #f5f8ff 0%, #ffffff 38%, #f8faff 100%);
}

.projects-tier {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.projects-tier:last-child {
  margin-bottom: 0;
}

.projects-tier__head {
  margin-bottom: 1.25rem;
  max-width: 42rem;
}

.projects-tier__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: linear-gradient(145deg, var(--color-primary-soft) 0%, var(--color-surface) 100%);
  color: var(--color-primary);
  margin-bottom: 0.65rem;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.projects-tier__icon--secondary {
  color: var(--color-text-muted);
  border-color: var(--color-border);
  background: var(--color-surface);
}

.projects-tier__title {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.45rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.projects-tier__desc {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.projects-tier__head--secondary .projects-tier__title {
  font-weight: 600;
}

/* —— Major projects —— */
.projects-major {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: linear-gradient(165deg, #f5f8ff 0%, #ffffff 55%, #fafbff 100%);
  box-shadow: var(--shadow-card);
}

.project-major {
  display: grid;
  gap: 1.1rem 1.35rem;
  align-items: stretch;
  padding: 1.2rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

@media (min-width: 768px) {
  .project-major {
    grid-template-columns: minmax(140px, 200px) 1fr;
  }
}

.project-major:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
}

.project-major__visual {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  min-height: 140px;
  background: var(--color-bg);
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-major__abbr {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 9vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.project-major:hover .project-major__abbr {
  transform: scale(1.05);
}

.project-major__visual--cs {
  background: linear-gradient(155deg, rgba(79, 140, 255, 0.14) 0%, var(--color-bg) 72%);
}

.project-major__visual--cs .project-major__abbr {
  color: var(--color-primary);
}

.project-major__visual--ee {
  background: linear-gradient(155deg, rgba(111, 76, 255, 0.12) 0%, var(--color-bg) 72%);
}

.project-major__visual--ee .project-major__abbr {
  color: #6f4cff;
}

.project-major__visual--db {
  background: linear-gradient(155deg, rgba(46, 160, 130, 0.11) 0%, var(--color-bg) 72%);
}

.project-major__visual--db .project-major__abbr {
  color: #2ea082;
}

.project-major__body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.project-major__label {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  border: 1px solid rgba(79, 140, 255, 0.25);
  background: var(--color-primary-soft);
}

.project-major__title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 0.2rem;
  color: var(--color-text);
}

.project-major__subtitle {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin: 0 0 0.75rem;
}

.project-major__text {
  margin: 0 0 1.15rem;
  font-size: 0.96rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
}

.project-major__stack {
  margin-bottom: 1.15rem;
}

.project-major__stack-head {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 0.55rem;
}

.project-major__stack-ico {
  flex-shrink: 0;
  opacity: 0.85;
}

.project-major__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.project-major__tags li {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text-muted);
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.project-major:hover .project-major__tags li {
  border-color: rgba(79, 140, 255, 0.32);
  color: var(--color-text);
  background: var(--color-primary-soft);
}

.project-major__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: auto;
}

.project-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.72rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}

.project-btn:hover {
  transform: translateY(-2px);
}

.project-btn:active {
  transform: translateY(0);
}

.project-btn--primary {
  background: var(--gradient-btn);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 14px -4px rgba(79, 140, 255, 0.45);
}

.project-btn--primary:hover {
  background: var(--gradient-btn-hover);
  color: #fff;
  box-shadow: 0 8px 22px -8px rgba(79, 140, 255, 0.48);
}

.project-btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.project-btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-card);
}

.project-btn__gh {
  flex-shrink: 0;
  opacity: 0.95;
}

/* —— Basic projects —— */
.projects-basic {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .projects-basic {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-basic {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-basic {
  display: flex;
  flex-direction: column;
  padding: 1.05rem 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-basic:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
}

.project-basic__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
  color: var(--color-text);
}

.project-basic__line {
  flex: 1;
  margin: 0 0 0.75rem;
  font-size: 0.86rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.project-basic__tech {
  list-style: none;
  margin: 0 0 0.85rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.project-basic__tech li {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.22rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-bg);
}

.project-basic__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  align-self: flex-start;
  margin-top: auto;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition), background var(--transition);
}

.project-basic__btn:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: 0 6px 18px -12px rgba(79, 140, 255, 0.55);
}

.project-basic__btn svg {
  flex-shrink: 0;
  opacity: 0.9;
}

/* ----- Internship ----- */
.internship__timeline {
  position: relative;
  max-width: 640px;
}

.internship__rail {
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary) 0%, rgba(79, 140, 255, 0.2) 100%);
  border-radius: 2px;
}

.internship__card {
  position: relative;
  padding-left: 2.75rem;
}

.internship__marker {
  position: absolute;
  left: 4px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-soft);
}

.internship__body {
  padding: 1.25rem 1.35rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.internship__body:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.internship__meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 1rem;
}

.internship__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
}

.internship__company {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
}

.internship__dates {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.internship__list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--color-text-muted);
  font-size: 0.94rem;
}

.internship__list li {
  margin-bottom: 0.5rem;
}

.internship__list li:last-child {
  margin-bottom: 0;
}

/* ----- Achievements ----- */
.badges {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.badge {
  font-size: 0.84rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  color: var(--color-text);
  transition: transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
}

.badge:hover {
  transform: translateY(-2px) scale(1.02);
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

/* ----- Languages ----- */
.languages {
  background: var(--color-surface);
}

.languages__grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

@media (min-width: 520px) {
  .languages__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .languages__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.lang-card {
  padding: 1.05rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.lang-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.lang-card__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
}

.lang-card__level {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ----- Contact ----- */
.contact__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

@media (min-width: 800px) {
  .contact__grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }
}

.contact__intro {
  color: var(--color-text-muted);
  margin: 0 0 1.5rem;
  font-size: 1.02rem;
}

.contact__links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact__links li {
  margin-bottom: 0.65rem;
}

.contact__links a {
  font-weight: 500;
  color: var(--color-text);
  display: inline-block;
  transition: transform var(--transition), color var(--transition);
}

.contact__links a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.contact__form {
  padding: 1.4rem 1.45rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.form-field__label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.form-field__input {
  font: inherit;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.form-field__input::placeholder {
  color: #9ca3af;
}

.form-field__input:hover {
  border-color: var(--color-border-strong);
}

.form-field__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
  background: var(--color-surface);
}

.form-field__input--area {
  resize: vertical;
  min-height: 120px;
}

.form-note {
  margin: 0.75rem 0 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  min-height: 1.25em;
}

.form-note.is-success {
  color: #1a7f4a;
}

.form-note.is-error {
  color: #c43d3d;
}

/* ----- Footer ----- */
.footer {
  padding: 1.5rem 1.25rem 1.75rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.footer__copy,
.footer__loc {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

/* ----- Reveal on scroll ----- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1), transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal--delay {
  transition-delay: 0.1s;
}

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