/* ============================================
   VARIABLES & RESET
   ============================================ */
:root {
  --bg: #f7f8fc;
  --bg-card: #ffffff;
  --bg-header: #0b1220;
  --text: #1a1a2e;
  --text-muted: #5a6480;
  --accent: #4f6ef7;
  --accent-hover: #3a57e8;
  --border: #e2e6f0;
  --shadow: 0 4px 24px rgba(0,0,0,0.07);
  --shadow-hover: 0 8px 40px rgba(79,110,247,0.15);
  --radius: 14px;
  --transition: 0.25s ease;
  --font: 'Poppins', sans-serif;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --bg-card: #161b27;
  --bg-header: #080d16;
  --text: #e6eaf5;
  --text-muted: #8892b0;
  --accent: #5f7bf8;
  --accent-hover: #7a92ff;
  --border: #1f2937;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
  --shadow-hover: 0 8px 40px rgba(95,123,248,0.2);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ============================================
   HEADER & NAV
   ============================================ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter: blur(12px);
}

.header-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.header-logo span {
  color: var(--accent);
}

nav ul {
  display: flex;
  gap: 0.25rem;
}

nav ul li a {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

nav ul li a:hover {
  color: #fff;
  background: rgba(255,255,255,0.07);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#dark-mode-toggle {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  cursor: pointer;
  font-size: 1rem;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

#dark-mode-toggle:hover {
  background: rgba(255,255,255,0.12);
  color: #fff;
}

.header-cv-btn {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  transition: background var(--transition);
  font-family: var(--font);
  border: none;
  cursor: pointer;
}

.header-cv-btn:hover {
  background: var(--accent-hover);
}

/* ============================================
   MAIN CONTAINER
   ============================================ */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* ============================================
   SECCIÓN BASE
   ============================================ */
section {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

section h2::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
  margin-left: 0.5rem;
}

/* ============================================
   HERO / INTRODUCTION
   ============================================ */
#introduction {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
  padding: 3rem 2.5rem;
  background: linear-gradient(135deg, #0b1220 0%, #111827 100%);
  border: 1px solid rgba(255,255,255,0.05);
}

.hero-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 6px rgba(79,110,247,0.15);
}

#introduction .hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
}

#typed-name {
  color: var(--accent);
}

.hero-tagline {
  font-size: 1rem;
  color: rgba(255,255,255,0.5);
  max-width: 520px;
}

.hero-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 0.5rem;
}

.hero-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1.1rem;
  border-radius: 8px;
  transition: all var(--transition);
  color: rgba(255,255,255,0.75);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
}

.hero-link:hover {
  color: #fff;
  border-color: var(--accent);
  background: rgba(79,110,247,0.1);
}

.hero-link.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.hero-link.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* ============================================
   SOBRE MÍ
   ============================================ */
#about p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ============================================
   TECH STACK
   ============================================ */
.tech-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 1rem;
}

.tech-list li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  transition: all var(--transition);
  cursor: default;
}

.tech-list li:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.tech-list img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  transition: filter var(--transition), transform var(--transition);
}

.tech-list li:hover img {
  transform: scale(1.1);
}

/* Logos que son negros sobre transparente — fondo pill para que se lean en ambos modos */
.tech-list img.logo-dark {
  background: #2d3748;
  border-radius: 8px;
  padding: 4px;
}

[data-theme="dark"] .tech-list img.logo-pill {
  filter: brightness(1.3);
}

.tech-list span {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
}

/* ============================================
   TIMELINE (Experiencia y Educación)
   ============================================ */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  display: flex;
  gap: 1.5rem;
  padding-bottom: 2rem;
  position: relative;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  width: 30px;
  min-width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.timeline-dot i {
  font-size: 0.7rem;
  color: var(--accent);
}

.timeline-content {
  padding-top: 2px;
  flex: 1;
}

.timeline-content h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.timeline-content .timeline-role {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-content .timeline-period {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.timeline-content ul {
  list-style: disc;
  padding-left: 1.1rem;
}

.timeline-content ul li {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================
   PROYECTOS
   ============================================ */
.proyectos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}

.proyecto-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg);
  transition: all var(--transition);
}

.proyecto-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}

.proyecto-card-img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  background: var(--border);
}

.proyecto-card-img-placeholder {
  width: 100%;
  height: 120px;
  background: linear-gradient(135deg, #0d1525 0%, #111827 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 2rem;
  opacity: 0.7;
  transition: opacity var(--transition);
}

.proyecto-card:hover .proyecto-card-img-placeholder {
  opacity: 1;
}

.proyecto-logo-img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 14px;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.4));
}

.proyecto-card-body {
  padding: 1.25rem;
}

.proyecto-card-body h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.proyecto-card-body p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.proyecto-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}

.proyecto-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 5px;
  background: rgba(79,110,247,0.1);
  color: var(--accent);
  border: 1px solid rgba(79,110,247,0.2);
}

.proyecto-links {
  display: flex;
  gap: 0.5rem;
}

.proyecto-link-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.8rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: transparent;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font);
  cursor: pointer;
}

.proyecto-link-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.proyecto-link-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.proyecto-link-btn.primary:hover {
  background: var(--accent-hover);
}

/* ============================================
   CONTACTO
   ============================================ */
#contact form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

#contact label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

#contact input,
#contact textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 0.7rem 1rem;
  font-size: 0.9rem;
  font-family: var(--font);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
  resize: vertical;
}

#contact input:focus,
#contact textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,110,247,0.12);
}

#contact textarea {
  min-height: 130px;
}

.submit-button {
  font-size: 0.9rem;
  font-family: var(--font);
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 9px;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  align-self: flex-start;
}

.submit-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* ============================================
   FLASH MESSAGES
   ============================================ */
.flash {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.85rem 1.1rem;
  border-radius: 9px;
  margin-bottom: 1.25rem;
}

.flash-notice {
  background: rgba(74,222,128,0.1);
  border: 1px solid rgba(74,222,128,0.3);
  color: #16a34a;
}

[data-theme="dark"] .flash-notice {
  color: #4ade80;
}

.flash-alert {
  background: rgba(251,146,60,0.1);
  border: 1px solid rgba(251,146,60,0.3);
  color: #ea580c;
}

[data-theme="dark"] .flash-alert {
  color: #fb923c;
}

/* ============================================
   WHATSAPP BUTTONS
   ============================================ */
.contact-whatsapp-btns {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.whatsapp-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: 9px;
  background: #25d366;
  color: #fff;
  transition: background var(--transition), transform var(--transition);
  border: none;
  cursor: pointer !important;
}

.whatsapp-btn:hover {
  background: #1db954;
  transform: translateY(-1px);
}

.contact-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.contact-divider::before,
.contact-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ============================================
   FOOTER
   ============================================ */
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--accent);
  font-weight: 600;
}

/* ============================================
   ANIMACIONES DE ENTRADA
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ============================================
   HERO AVATAR — ring animado
   ============================================ */
.hero-avatar-wrapper {
  position: relative;
  width: 128px;
  height: 128px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-avatar-wrapper::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent), #a78bfa, #ec4899, var(--accent));
  animation: ring-spin 3s linear infinite;
  z-index: 0;
}

.hero-avatar-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #0b1220;
  z-index: 1;
}

.hero-avatar {
  position: relative;
  z-index: 2;
  width: 116px;
  height: 116px;
  border-radius: 50%;
  object-fit: cover;
  border: none;
  box-shadow: none;
}

@keyframes ring-spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   HEADER GLASSMORPHISM al scroll
   ============================================ */
header.scrolled {
  background: rgba(11, 18, 32, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

/* ============================================
   NAV ACTIVO
   ============================================ */
nav ul li a.active {
  color: #fff;
  background: rgba(79,110,247,0.15);
}

/* ============================================
   TERMINAL ANIMADA
   ============================================ */
.hero-terminal {
  background: rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 0.75rem 1.1rem;
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.7);
  text-align: left;
  min-width: 260px;
  margin-top: 0.25rem;
}

.hero-terminal .t-prompt { color: #4ade80; }
.hero-terminal .t-cmd    { color: #fff; }
.hero-terminal .t-out    { color: var(--accent); }
.hero-terminal .t-cursor {
  display: inline-block;
  width: 8px;
  height: 13px;
  background: #4ade80;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* ============================================
   CARDS CON ACENTO POR CATEGORÍA
   ============================================ */
.proyecto-card[data-cat="ia"] { --card-accent: #a78bfa; }
.proyecto-card[data-cat="web"] { --card-accent: #38bdf8; }
.proyecto-card[data-cat="oss"] { --card-accent: #4ade80; }
.proyecto-card[data-cat="saas"] { --card-accent: #f472b6; }

.proyecto-card[data-cat] {
  border-color: transparent;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--card-accent) 25%, transparent);
}

.proyecto-card[data-cat]:hover {
  box-shadow: 0 8px 32px color-mix(in srgb, var(--card-accent) 20%, transparent);
  border-color: color-mix(in srgb, var(--card-accent) 40%, transparent);
}

.proyecto-card[data-cat] .proyecto-card-img-placeholder {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--card-accent) 12%, #0d1525) 0%,
    #0d1525 100%
  );
  color: var(--card-accent);
}

.proyecto-card[data-cat] .proyecto-tag {
  background: color-mix(in srgb, var(--card-accent) 12%, transparent);
  color: var(--card-accent);
  border-color: color-mix(in srgb, var(--card-accent) 25%, transparent);
}

.proyecto-card[data-cat] .proyecto-link-btn.primary {
  background: var(--card-accent);
  border-color: var(--card-accent);
  color: #0d1117;
}

.proyecto-card[data-cat] .proyecto-link-btn.primary:hover {
  filter: brightness(1.1);
}

/* ============================================
   SOBRE MÍ — dos columnas
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-width: 180px;
}

.about-meta-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.about-meta-item i {
  color: var(--accent);
  width: 14px;
  text-align: center;
}

.about-meta-item strong {
  color: var(--text);
  font-weight: 600;
}

@media (max-width: 540px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ============================================
   CURSOR PERSONALIZADO
   ============================================ */
*, *::before, *::after { cursor: none !important; }

.cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.1s ease, background 0.2s ease, width 0.2s ease, height 0.2s ease;
}

.cursor-ring {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: transform 0.12s ease, width 0.2s ease, height 0.2s ease, opacity 0.2s ease, border-color 0.2s ease;
  opacity: 0.5;
}

.cursor-dot.hovering {
  width: 12px;
  height: 12px;
  background: var(--accent-hover);
}

.cursor-ring.hovering {
  width: 44px;
  height: 44px;
  opacity: 0.25;
  border-color: var(--accent-hover);
}

/* ============================================
   STAT BAR
   ============================================ */
.stat-bar {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 0.25rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}

.stat-number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.45);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ============================================
   SCROLL INDICATOR
   ============================================ */
.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.75rem;
  opacity: 0.4;
  transition: opacity 0.4s ease;
  cursor: pointer !important;
}

.scroll-indicator.hidden {
  opacity: 0;
  pointer-events: none;
}

.scroll-indicator span {
  font-size: 0.68rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scroll-mouse {
  width: 20px;
  height: 32px;
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: 10px;
  display: flex;
  justify-content: center;
  padding-top: 5px;
}

.scroll-wheel {
  width: 3px;
  height: 6px;
  background: rgba(255,255,255,0.5);
  border-radius: 2px;
  animation: scroll-wheel 1.8s ease infinite;
}

@keyframes scroll-wheel {
  0%   { transform: translateY(0); opacity: 1; }
  80%  { transform: translateY(10px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ============================================
   BADGE "APRENDIENDO"
   ============================================ */
.learning-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  background: rgba(79,110,247,0.12);
  border: 1px solid rgba(79,110,247,0.25);
  color: var(--accent);
  margin-bottom: 1rem;
}

.learning-badge .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 0 0 rgba(74,222,128,0.4);
  animation: pulse-badge 2s infinite;
}

@keyframes pulse-badge {
  0%   { box-shadow: 0 0 0 0 rgba(74,222,128,0.4); }
  70%  { box-shadow: 0 0 0 6px rgba(74,222,128,0); }
  100% { box-shadow: 0 0 0 0 rgba(74,222,128,0); }
}

/* ============================================
   TOOLTIP NIVEL EN TECH STACK
   ============================================ */
.tech-list li {
  position: relative;
}

.tech-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-header);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 10;
}

.tech-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--bg-header);
}

.tech-list li:hover .tech-tooltip {
  opacity: 1;
}

.level-advanced { color: #4ade80; }
.level-intermediate { color: #facc15; }
.level-learning { color: #fb923c; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 640px) {
  header {
    padding: 0 1rem;
  }

  nav ul {
    gap: 0;
  }

  nav ul li a {
    padding: 0.4rem 0.5rem;
    font-size: 0.78rem;
  }

  main {
    padding: 1.5rem 1rem 4rem;
    gap: 1.5rem;
  }

  section {
    padding: 1.5rem;
  }

  #introduction {
    padding: 2rem 1.5rem;
  }

  .hero-avatar {
    width: 90px;
    height: 90px;
  }

  #introduction .hero-title {
    font-size: 1.3rem;
  }

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

  .tech-list {
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  }
}

@media (max-width: 480px) {
  .header-logo { font-size: 1rem; }
  nav { display: none; }
}