/* ===== Variables ===== */
:root {
  --bg: #0f1115;
  --fg: #f5f7fa;
  --muted: #a3abb3;
  --brand: #73d070;
  --accent: #a6bdac;
}

/* ===== Reset & Base ===== */
* {
  box-sizing: border-box;
  scroll-behavior: smooth;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  scroll-snap-type: y mandatory;
}

h1, h2, h3 {
  font-weight: 600;
}

/* ===== Layout General ===== */
section {
  padding: 80px 20px;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 40px;
}

/* ===== Pantallas con scroll-snap ===== */
.screen {
  min-height: 100vh;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  justify-content: center; /* centra vertical */
}

.screen section,
.screen header {
  margin: 0 auto;
  width: 100%;
}

.screen:last-of-type {
  min-height: auto;
  scroll-snap-align: end;
}

.screen:first-of-type {
  background: linear-gradient(180deg, #151820, #0f1115);
}

/* ===== Header ===== */
header {
  text-align: center;
  padding: 80px 20px 60px;
  background: transparent; /* hereda fondo del .screen */
}

header h1 span {
  color: var(--brand);
}

header p {
  max-width: 650px;
  margin: 0 auto;
  color: var(--muted);
}

/* ===== Botones ===== */
.btn {
  display: inline-block;
  background: var(--brand);
  color: #111;
  padding: 10px 20px;
  margin-top: 20px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: 0.3s;
}

.btn:hover {
  background: var(--accent);
  color: #fff;
}

/* Botón deshabilitado */
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===== Sobre mí ===== */
#about p {
  max-width: 750px;
  margin: 0 auto;
  text-align: center;
  color: var(--muted);
}

/* ===== Proyectos ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.project-card {
  background: #141821;
  padding: 20px;
  border-radius: 14px;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
  text-align: center;
  transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.project-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 15px;
  display: block;
}

.project-card p {
  color: var(--muted);
}

.links {
  margin-top: 15px;
}

.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.5);
}

.project-card:hover h3 {
  color: var(--brand);
}

/* ===== Certificaciones ===== */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.cert-card {
  background: #141821;
  border: 1px solid #232838;
  border-radius: 14px;
  padding: 18px;
  text-align: center;
  box-shadow: 0 6px 22px rgba(0,0,0,0.35);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.cert-card h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.cert-card .issuer {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.cert-actions {
  margin-top: auto;
  display: flex;
  justify-content: center;
}

.cert-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.5);
}

.cert-card:hover h3 {
  color: var(--brand);
}

/* ===== Contacto ===== */
#contacto {
  text-align: center;
}

#contacto a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
}

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

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 30px;
  background: #0c0e12;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: auto;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .cert-card {
    padding: 16px;
  }
}