/* ══════════════════════════════════════════
   DESIGN TOKENS — Single Source of Truth
══════════════════════════════════════════ */
:root {
  /* Palette — Slate noir + Electric teal accent */
  --clr-bg:          #0c0f12;
  --clr-bg-alt:      #111418;
  --clr-surface:     #161b22;
  --clr-surface-2:   #1e252e;
  --clr-border:      rgba(255,255,255,0.07);
  --clr-accent:      #00c896;
  --clr-accent-dim:  rgba(0, 200, 150, 0.12);
  --clr-accent-2:    #0099ff;
  --clr-text:        #e8edf2;
  --clr-text-muted:  #7a8799;
  --clr-text-faint:  #3d4a58;

  /* Typography */
  --font-display:    'DM Serif Display', Georgia, serif;
  --font-body:       'DM Sans', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs:   0.5rem;
  --space-sm:   1rem;
  --space-md:   1.5rem;
  --space-lg:   2.5rem;
  --space-xl:   4rem;
  --space-2xl:  7rem;

  /* Misc */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-full: 9999px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 32px rgba(0,0,0,0.4);
}

/* ══════════════════════════════════════════
   RESET & BASE
══════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea { font: inherit; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ══════════════════════════════════════════
   SCROLL REVEAL ANIMATIONS
══════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--transition), transform 0.7s var(--transition);
}

.reveal--delay {
  transition-delay: 0.15s;
}

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

/* ══════════════════════════════════════════
   NAVIGATION
══════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--space-lg);
  background: rgba(12,15,18,0.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--clr-border);
  transition: padding var(--transition);
}

.nav.scrolled {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.nav__initials {
  visibility: hidden;
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--clr-accent);
  letter-spacing: 0.05em;
}

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

.nav__link {
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--clr-accent);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--clr-text);
}

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

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 26px;
}

.nav__burger span {
  display: block;
  height: 1.5px;
  background: var(--clr-text);
  transition: var(--transition);
  transform-origin: center;
}

.nav__burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ══════════════════════════════════════════
   HERO
══════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(80px + var(--space-xl)) var(--space-lg) var(--space-xl);
  overflow: hidden;
  gap: var(--space-xl);
}

.hero__bg-glow {
  position: absolute;
  top: -30%;
  right: -15%;
  width: 55vw;
  height: 55vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,200,150,0.08) 0%, transparent 70%);
  pointer-events: none;
  animation: glow-pulse 6s ease-in-out infinite alternate;
}

@keyframes glow-pulse {
  from { transform: scale(1); opacity: 0.6; }
  to   { transform: scale(1.15); opacity: 1; }
}

.hero__content {
  flex: 1;
  max-width: 580px;
}

.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  line-height: 1.02;
  font-weight: 400;
  margin-bottom: var(--space-md);
}

.hero__title em {
  font-style: italic;
  color: var(--clr-accent);
}

.hero__subtitle {
  font-size: 1.05rem;
  color: var(--clr-text-muted);
  max-width: 460px;
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.hero__cta-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero__photo-wrap {
  position: relative;
  flex-shrink: 0;
}

.hero__photo-ring {
  position: absolute;
  inset: -12px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-accent);
  opacity: 0.3;
  animation: ring-rotate 12s linear infinite;
}

@keyframes ring-rotate {
  from { transform: rotate(0deg); border-radius: 25% 35% 45% 30%; }
  50%  { border-radius: 45% 25% 35% 45%; }
  to   { transform: rotate(360deg); border-radius: 25% 35% 45% 30%; }
}

.hero__photo {
  width: 320px;
  height: 400px;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  position: relative;
  z-index: 1;
  filter: grayscale(15%);
  box-shadow: var(--shadow-card);
}

.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-lg);
  left: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  animation: fade-up 2s ease 1.5s both;
}

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

.hero__scroll-line {
  width: 40px;
  height: 1px;
  background: linear-gradient(to right, var(--clr-text-faint), transparent);
  animation: line-extend 2s ease 2s both;
}

@keyframes line-extend {
  from { width: 0; }
  to   { width: 40px; }
}

/* ══════════════════════════════════════════
   BUTTONS
══════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: all var(--transition);
}

.btn--primary {
  background: var(--clr-accent);
  color: #0c0f12;
}

.btn--primary:hover {
  background: #00e5aa;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,200,150,0.3);
}

.btn--ghost {
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
}

.btn--ghost:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  transform: translateY(-2px);
}

.btn--full { width: 100%; justify-content: center; }

/* ══════════════════════════════════════════
   SECTIONS GENERIC
══════════════════════════════════════════ */
.section {
  padding: var(--space-2xl) 0;
}

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

.section__header {
  margin-bottom: var(--space-xl);
}

.section__label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: var(--space-xs);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 400;
  line-height: 1.1;
}

/* ══════════════════════════════════════════
   ABOUT
══════════════════════════════════════════ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-xl);
  align-items: start;
}

.about__lead {
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: var(--space-md);
  line-height: 1.75;
}

.about__text p + p {
  margin-top: var(--space-sm);
  color: var(--clr-text-muted);
}

.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--space-md);
}

.tag {
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--clr-accent-dim);
  color: var(--clr-accent);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid rgba(0,200,150,0.2);
}

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

.stat-card {
  padding: var(--space-md);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--clr-accent);
  transform: translateX(-4px);
}

.stat-card__num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--clr-accent);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-card__label {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
}

/* ══════════════════════════════════════════
   TIMELINE (EXPERIENCE)
══════════════════════════════════════════ */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.timeline__item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: var(--space-md);
  align-items: start;
  position: relative;
}

.timeline__line {
  position: absolute;
  left: 11px;
  top: 28px;
  bottom: calc(-1 * var(--space-xl));
  width: 1px;
  background: var(--clr-border);
}

.timeline__item:last-child .timeline__line {
  display: none;
}

.timeline__dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--clr-surface);
  border: 2px solid var(--clr-accent);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  margin-top: 4px;
  transition: transform var(--transition);
}

.timeline__item:hover .timeline__dot {
  transform: scale(1.3);
  background: var(--clr-accent);
}

.timeline__card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.timeline__card:hover {
  border-color: rgba(0,200,150,0.3);
  box-shadow: 0 0 32px rgba(0,200,150,0.06);
}

.timeline__company-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.timeline__logo-wrap {
  width: 80px;
  height: 48px;
  background: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  flex-shrink: 0;
}

.timeline__logo {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.timeline__logo-fallback {
  font-weight: 700;
  color: #000;
  font-size: 0.9rem;
}

.timeline__role {
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.2;
}

.timeline__company {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  margin-top: 2px;
}

.timeline__date {
  display: inline-block;
  margin-top: 4px;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: var(--clr-accent-dim);
  color: var(--clr-accent);
  font-weight: 500;
}

.timeline__desc {
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
  line-height: 1.75;
}

.timeline__bullets {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.timeline__bullets li {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  padding-left: 1.2rem;
  position: relative;
}

.timeline__bullets li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--clr-accent);
  font-size: 0.8rem;
}

/* ══════════════════════════════════════════
   SKILLS
══════════════════════════════════════════ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.skill-group {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.skill-group__title {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
}

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

.skill-bar {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.skill-bar__name {
  font-size: 0.88rem;
  font-weight: 400;
}

.skill-bar__track {
  height: 4px;
  background: var(--clr-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-bar__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent-2));
  border-radius: var(--radius-full);
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.soft-skills {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.soft-skills__title {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
}

.soft-skills__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.soft-card {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  transition: color var(--transition);
}

.soft-card:hover { color: var(--clr-text); }

.soft-card__icon {
  color: var(--clr-accent);
  font-size: 0.7rem;
  flex-shrink: 0;
}

/* ══════════════════════════════════════════
   EDUCATION
══════════════════════════════════════════ */
.edu__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.edu-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  display: flex;
  gap: var(--space-md);
  transition: border-color var(--transition), transform var(--transition);
}

.edu-card:hover {
  border-color: rgba(0,200,150,0.3);
  transform: translateY(-4px);
}

.edu-card__badge {
  font-size: 1.8rem;
  flex-shrink: 0;
  margin-top: 4px;
}

.edu-card__type {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 0.4rem;
}

.edu-card__title {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.edu-card__inst {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
  margin-bottom: 0.6rem;
}

.edu-card__desc {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
}

/* ══════════════════════════════════════════
   CONTACT
══════════════════════════════════════════ */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact__lead {
  font-size: 1.05rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
  line-height: 1.75;
}

.contact__items {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.contact__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  transition: color var(--transition);
}

.contact__item:hover { color: var(--clr-text); }

.contact__item-icon { font-size: 1rem; }

/* Social links */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
  transition: all var(--transition);
}

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

.social-link--linkedin:hover {
  border-color: #0077b5;
  color: #0077b5;
  box-shadow: 0 4px 16px rgba(0,119,181,0.2);
}

.social-link--email:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  box-shadow: 0 4px 16px rgba(0,200,150,0.2);
}

.social-link--github:hover {
  border-color: #e6edf3;
  color: #e6edf3;
}

/* Form */
.contact__form-wrap {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

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

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
}

.form-group input,
.form-group textarea {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--clr-text);
  font-size: 0.92rem;
  transition: border-color var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(0,200,150,0.1);
}

/* ══════════════════════════════════════════
   CERTIFICATIONS STRIP
══════════════════════════════════════════ */
.certs-strip {
  margin-top: var(--space-xl);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-sm);
}

.cert-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), transform var(--transition);
}

.cert-card:hover {
  border-color: rgba(0,200,150,0.3);
  transform: translateY(-2px);
}

.cert-card__logo-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 4px;
  overflow: hidden;
}

.cert-card__logo {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.cert-card__title {
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--clr-text);
}

.cert-card__date {
  display: block;
  font-size: 0.72rem;
  color: var(--clr-accent);
  margin-top: 2px;
}

/* ══════════════════════════════════════════
   FOOTER
══════════════════════════════════════════ */
.footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--clr-border);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--clr-text-faint);
}

.footer__social {
  display: flex;
  gap: var(--space-sm);
}

.footer__social a {
  color: var(--clr-text-faint);
  transition: color var(--transition);
}

.footer__social a:hover {
  color: var(--clr-accent);
}

/* ══════════════════════════════════════════
   CHATBOX WIDGET
══════════════════════════════════════════ */
.chatbox {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
}

.chatbox__toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: #0c0f12;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,200,150,0.4);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.chatbox__toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(0,200,150,0.5);
}

.chatbox__icon-close {
  display: none;
  position: absolute;
}

.chatbox.open .chatbox__icon-open { display: none; }
.chatbox.open .chatbox__icon-close { display: block; }

.chatbox__badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ff4757;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition), transform var(--transition);
}

.chatbox__badge.hidden {
  opacity: 0;
  transform: scale(0);
}

.chatbox__panel {
  width: 330px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  /* Closed state */
  max-height: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px) scale(0.96);
  transform-origin: bottom right;
  transition: 
    max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.35s ease,
    transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.chatbox.open .chatbox__panel {
  max-height: 460px;
  opacity: 1;
  pointer-events: all;
  transform: translateY(0) scale(1);
}

.chatbox__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 1rem var(--space-md);
  background: linear-gradient(135deg, #001a14, #001f20);
  border-bottom: 1px solid var(--clr-border);
}

.chatbox__avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: #0c0f12;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chatbox__header-name {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1;
}

.chatbox__status {
  display: block;
  font-size: 0.72rem;
  color: var(--clr-accent);
  margin-top: 3px;
}

.chatbox__close-btn {
  margin-left: auto;
  color: var(--clr-text-muted);
  transition: color var(--transition);
}

.chatbox__close-btn:hover { color: var(--clr-text); }

.chatbox__messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  max-height: 300px;
  scrollbar-width: thin;
  scrollbar-color: var(--clr-surface-2) transparent;
}

.chatbox__message {
  max-width: 85%;
  padding: 0.6rem 0.9rem;
  border-radius: 14px;
  font-size: 0.85rem;
  line-height: 1.5;
  animation: msg-in 0.3s ease;
}

@keyframes msg-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chatbox__message--bot {
  background: var(--clr-surface-2);
  color: var(--clr-text);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chatbox__message--user {
  background: var(--clr-accent);
  color: #0c0f12;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
  font-weight: 500;
}

.chatbox__input-row {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem var(--space-md);
  border-top: 1px solid var(--clr-border);
}

.chatbox__input {
  flex: 1;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  padding: 0.5rem 0.9rem;
  color: var(--clr-text);
  font-size: 0.85rem;
  transition: border-color var(--transition);
}

.chatbox__input:focus {
  outline: none;
  border-color: var(--clr-accent);
}

.chatbox__send {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: #0c0f12;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition), background var(--transition);
}

.chatbox__send:hover {
  transform: scale(1.1);
  background: #00e5aa;
}

/* ══════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════ */
@media (max-width: 900px) {
  .about__grid { grid-template-columns: 1fr; }
  .skills__grid { grid-template-columns: 1fr; }
  .edu__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
  .soft-skills__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--clr-bg);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-sm);
    border-bottom: 1px solid var(--clr-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    z-index: 99;
  }

  .nav__links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav__burger { display: flex; }

  .hero {
    flex-direction: column-reverse;
    text-align: center;
    padding-top: calc(80px + var(--space-lg));
    gap: var(--space-lg);
  }

  .hero__photo { width: 220px; height: 280px; }
  .hero__scroll-hint { display: none; }
  .hero__cta-group { justify-content: center; }
  .hero__subtitle { margin: 0 auto var(--space-lg); }

  .timeline__item { grid-template-columns: 18px 1fr; }

  .chatbox {
    bottom: 1.25rem;
    right: 1.25rem;
  }

  .chatbox__panel { width: calc(100vw - 2.5rem); }
}

@media (max-width: 480px) {
  :root { --space-2xl: 4.5rem; }
  .section__title { font-size: 2rem; }
  .edu-card { flex-direction: column; }
  .soft-skills__grid { grid-template-columns: 1fr 1fr; }
}

/* Markdown dentro del chatbox */
.chatbox__message--bot p { margin-bottom: 0.4rem; }
.chatbox__message--bot p:last-child { margin-bottom: 0; }

.chatbox__message--bot strong { color: var(--clr-text); font-weight: 600; }

.chatbox__message--bot ul,
.chatbox__message--bot ol {
  padding-left: 1.2rem;
  margin: 0.4rem 0;
}

.chatbox__message--bot li { margin-bottom: 0.2rem; }

.chatbox__message--bot code {
  background: var(--clr-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--clr-accent);
}

.chatbox__message--bot pre {
  background: var(--clr-bg);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 0.4rem 0;
}

.chatbox__message--bot pre code {
  background: none;
  padding: 0;
}

.chatbox__message--bot a {
  color: var(--clr-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.chatbox__message--bot a {
  color: var(--clr-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
/* ══════════════════════════════════════════
   LIGHT THEME TOKENS
   All colors override :root via data-theme
══════════════════════════════════════════ */
[data-theme="light"] {
  --clr-bg:          #f4f6f9;
  --clr-bg-alt:      #eaecf1;
  --clr-surface:     #ffffff;
  --clr-surface-2:   #dde1e9;
  --clr-border:      rgba(0,0,0,0.10);
  --clr-accent:      #009d75;
  --clr-accent-dim:  rgba(0,157,117,0.12);
  --clr-accent-2:    #0077cc;
  --clr-text:        #0d1520;
  --clr-text-muted:  #4e5d70;
  --clr-text-faint:  #9daabb;
  --shadow-card:     0 4px 20px rgba(0,0,0,0.08);
}

/* Nav background adapts to theme */
[data-theme="light"] .nav {
  background: rgba(244,246,249,0.88);
}

/* Hero glow lighter in light mode */
[data-theme="light"] .hero__bg-glow {
  background: radial-gradient(circle, rgba(0,157,117,0.06) 0%, transparent 70%);
}

/* Smooth color transitions on theme switch */
html { transition: background-color 0.3s ease, color 0.3s ease; }
body, .nav, .section, .section--alt, .stat-card, .timeline__card,
.skill-group, .soft-skills, .edu-card, .certs-strip, .cert-card,
.contact__form-wrap, .chatbox__panel, .chatbox__header,
.form-group input, .form-group textarea {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* ══════════════════════════════════════════
   NAV CONTROLS (lang + theme + burger row)
══════════════════════════════════════════ */
.nav__controls {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

/* ── Language toggle ── */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  padding: 4px 10px;
  user-select: none;
  cursor: default;
}
.lang-toggle__opt {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--clr-text-muted);
  cursor: pointer;
  padding: 2px 5px;
  border-radius: var(--radius-full);
  transition: color 0.25s, background 0.25s;
}
.lang-toggle__opt.active {
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}
.lang-toggle__opt:hover:not(.active) { color: var(--clr-text); }
.lang-toggle__sep { font-size: 0.7rem; color: var(--clr-text-faint); pointer-events: none; }

/* ── Theme toggle switch ── */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: border-color 0.25s;
}
.theme-toggle:hover { border-color: var(--clr-accent); }
.theme-toggle__icon { font-size: 0.82rem; line-height: 1; }

.theme-toggle__track {
  width: 30px;
  height: 16px;
  background: var(--clr-surface-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--clr-border);
  position: relative;
  transition: background 0.3s;
}
[data-theme="light"] .theme-toggle__track {
  background: rgba(0,157,117,0.2);
}
.theme-toggle__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--clr-text-muted);
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1), background 0.3s;
}
[data-theme="light"] .theme-toggle__thumb {
  transform: translateX(14px);
  background: var(--clr-accent);
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .nav__controls { gap: 0.4rem; }
  .lang-toggle { padding: 3px 7px; }
  .theme-toggle { padding: 3px 6px; }
}