/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  /* Colors */
  --color-bg:            #ffffff;
  --color-surface:       #f8fafc;
  --color-accent:        #2563eb;
  --color-accent-hover:  #1d4ed8;
  --color-text:          #0f172a;
  --color-text-muted:    #64748b;
  --color-border:        #e2e8f0;

  --color-hero-from:     #0f172a;
  --color-hero-to:       #1e3a8a;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;

  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

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

  /* Misc */
  --container-width: 1100px;
  --radius:          0.5rem;
  --radius-lg:       1rem;
  --transition:      0.2s ease;
  --shadow:          0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-hover:    0 4px 8px rgba(0,0,0,0.1), 0 12px 32px rgba(0,0,0,0.1);
}

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

html {
  scroll-behavior: smooth;
}

ul {
  list-style: none;
}

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

/* ============================================
   BASE
   ============================================ */
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.7;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-2xl) 0;
}

section h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
  color: var(--color-text);
  position: relative;
  display: inline-block;
  padding-bottom: var(--space-sm);
}

section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-weight: 600;
  font-size: var(--text-base);
  transition: all var(--transition);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background-color: transparent;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
  color: #ffffff;
}

/* ============================================
   HEADER & NAV
   ============================================ */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  color: #ffffff;
  background-color: var(--color-accent);
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition);
}

.nav-logo i {
  width: 18px;
  height: 18px;
}

.nav-logo:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #ffffff;
}

.nav-links a.active {
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #ffffff;
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   HERO
   ============================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
  background: linear-gradient(135deg, var(--color-hero-from) 0%, var(--color-hero-to) 100%);
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero-content {
  max-width: 700px;
  position: relative;
  z-index: 1;
  animation: fadeUp 0.8s ease forwards;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#hero h1 {
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
  color: #ffffff;
  animation: fadeUp 0.8s ease 0.1s both;
}

.hero-titulo {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
  animation: fadeUp 0.8s ease 0.25s both;
}

.hero-frase {
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
  animation: fadeUp 0.8s ease 0.4s both;
}

.hero-ctas {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeUp 0.8s ease 0.55s both;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition);
  animation: bounce 2s infinite;
}

.scroll-indicator:hover {
  color: rgba(255, 255, 255, 0.9);
}

.scroll-indicator i {
  width: 28px;
  height: 28px;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   SOBRE MÍ
   ============================================ */
#sobre-mi {
  background-color: var(--color-bg);
}

.sobre-mi-content {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.sobre-mi-foto img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.sobre-mi-texto p {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 720px;
  margin-bottom: var(--space-md);
}

.cv-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  transition: all var(--transition);
}

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

/* ============================================
   SKILLS
   ============================================ */
#skills {
  background-color: var(--color-surface);
}

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

.skills-categoria {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.skills-categoria:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.skills-categoria h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.skills-categoria h3 i {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.skills-categoria li {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.skills-categoria li:last-child {
  border-bottom: none;
}

/* ============================================
   PROYECTOS
   ============================================ */
#proyectos {
  background-color: var(--color-bg);
}

.proyectos-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.proyecto-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.proyecto-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.badge {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius);
  padding: 0.2rem 0.75rem;
  margin-bottom: var(--space-sm);
}

.proyecto-card p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

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

.proyecto-stack li {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius);
  padding: 0.25rem 0.75rem;
}

/* ============================================
   CONTACTO
   ============================================ */
#contacto {
  background-color: var(--color-surface);
  text-align: center;
}

.contacto-subtexto {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
}

.contacto-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.contacto-links a {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.contacto-links a i {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.contacto-links a:hover {
  color: var(--color-accent);
}

/* ============================================
   FOOTER
   ============================================ */
footer {
  background-color: var(--color-hero-from);
  padding: var(--space-lg) 0;
  text-align: center;
}

footer p {
  color: rgba(255, 255, 255, 0.4);
  font-size: var(--text-sm);
}

/* ============================================
   RESPONSIVE — MOBILE
   ============================================ */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2.25rem;
    --text-3xl: 1.5rem;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #0f172a;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: var(--space-md);
    gap: var(--space-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .sobre-mi-content {
    grid-template-columns: 1fr;
  }

  .sobre-mi-foto img {
    max-width: 200px;
    margin: 0 auto;
  }

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

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

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