/* =========================================================
   DESIGN TOKENS
   Color pairs verified against WCAG 2.1 AA/AAA
   (Navy/Deep Teal base + White/Beige/Light Gray text,
   Yellow/Sky Blue accents) — see easy-node-wiki
   accessible-color-pairs.md
   ========================================================= */
:root {
  /* Color — surfaces (dark mode via elevation, not lighter hues) */
  --color-bg: #1b365d;              /* Navy — page base */
  --color-surface: #003b49;         /* Deep Teal — elevated sections/cards */
  --color-surface-soft: #12294a;    /* subtle secondary surface on Navy */

  /* Color — text (each pairing verified AA/AAA) */
  --color-text: #ffffff;                  /* on Navy or Deep Teal — AAA */
  --color-text-muted-bg: #d0d3d4;         /* Light Gray on Navy — AAA */
  --color-text-muted-surface: #d6d2c4;    /* Beige on Deep Teal — AAA */

  /* Color — accents */
  --color-accent: #ffc845;          /* Yellow — Navy/Deep Teal pairing AAA */
  --color-accent-2: #41b6e6;        /* Sky Blue — Navy pairing AA */

  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-strong: rgba(255, 255, 255, 0.18);

  /* Typography */
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  --text-body-sm: 0.875rem;
  --text-body-md: 1rem;
  --text-body-lg: 1.125rem;
  --text-heading-sm: 1.5rem;
  --text-heading-md: 2rem;
  --text-heading-lg: 2.75rem;
  --text-heading-xl: clamp(2.25rem, 4vw + 1.2rem, 3.75rem);

  --leading-tight: 1.15;
  --leading-heading: 1.25;
  --leading-body: 1.6;

  /* Spacing — 4pt scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Motion — deceleration curve only, no bounce */
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;

  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --radius-pill: 999px;

  --max-width: 72rem;
}

/* =========================================================
   RESET
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  z-index: 100;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-inline: var(--space-6);
}

/* =========================================================
   HEADER / NAV
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(27, 54, 93, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
  gap: var(--space-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-body-lg);
}
.brand-mark {
  font-family: var(--font-mono);
  color: var(--color-accent);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.main-nav a {
  font-size: var(--text-body-sm);
  color: var(--color-text-muted-bg);
  transition: color var(--duration-fast) var(--ease-standard);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.main-nav a:hover { color: var(--color-text); }
.nav-cta {
  color: var(--color-bg) !important;
  background: var(--color-accent);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-weight: 600;
}
.nav-cta:hover { color: var(--color-bg) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: var(--space-4) var(--space-6) var(--space-6);
  gap: var(--space-1);
  border-top: 1px solid var(--color-border);
}
.mobile-nav a {
  padding: var(--space-3) 0;
  min-height: 44px;
  display: flex;
  align-items: center;
  color: var(--color-text-muted-bg);
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav.is-open { display: flex; }

@media (max-width: 51.25em) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  position: relative;
  padding-block: var(--space-32) var(--space-24);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, var(--color-border-strong) 1px, transparent 0);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 30%, black 40%, transparent 90%);
  opacity: 0.5;
}
.hero-inner {
  position: relative;
  max-width: 46rem;
}
.eyebrow {
  font-family: var(--font-mono);
  color: var(--color-accent-2);
  font-size: var(--text-body-sm);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}
.hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-heading-xl);
  font-weight: 700;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-6);
}
.hero-title .accent { color: var(--color-accent); }
.hero-subtitle {
  font-size: var(--text-body-lg);
  color: var(--color-text-muted-bg);
  max-width: 38rem;
  margin-bottom: var(--space-8);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* =========================================================
   BUTTONS
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--text-body-md);
  transition: transform var(--duration-fast) var(--ease-standard),
              background var(--duration-fast) var(--ease-standard);
}
.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

/* =========================================================
   SECTIONS (generic)
   ========================================================= */
.section { padding-block: var(--space-24); }
.section-elevated { background: var(--color-surface); }
.section-kicker {
  font-family: var(--font-mono);
  color: var(--color-accent-2);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-2);
}
.section-elevated .section-kicker,
.section-elevated .section-lead { color: var(--color-accent-2); }
.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-heading-lg);
  font-weight: 700;
  line-height: var(--leading-heading);
  margin-bottom: var(--space-4);
}
.section-lead {
  font-size: var(--text-body-lg);
  color: var(--color-text-muted-bg);
  max-width: 40rem;
  margin-bottom: var(--space-16);
}
.section-elevated .section-lead { color: var(--color-text-muted-surface); }

/* =========================================================
   SKILLS
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--space-8);
}
.skill-group h3 {
  font-family: var(--font-heading);
  font-size: var(--text-body-lg);
  margin-bottom: var(--space-4);
}
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.tag-list li {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted-bg);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
}
.tag-list--mono li {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-muted-surface);
}

/* =========================================================
   PROJECTS
   ========================================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}
.project-card--flagship { grid-column: 1 / -1; }

.project-card {
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--duration-base) var(--ease-standard),
              border-color var(--duration-base) var(--ease-standard);
}
.section-elevated .project-card {
  background: rgba(0, 0, 0, 0.15);
}
.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-2);
}
.project-card--flagship {
  border-color: var(--color-accent);
}
.project-card-body { padding: var(--space-8); }
.project-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.project-card h3 {
  font-family: var(--font-heading);
  font-size: var(--text-heading-sm);
  margin-bottom: var(--space-3);
}
.project-card p {
  color: var(--color-text-muted-surface);
  margin-bottom: var(--space-4);
}
.project-card .tag-list { margin-bottom: var(--space-6); }
.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.project-links a {
  font-size: var(--text-body-sm);
  font-weight: 600;
  color: var(--color-accent-2);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.project-links a:hover { text-decoration: underline; }

.projects-more {
  margin-top: var(--space-12);
  text-align: center;
}
.projects-more a {
  font-weight: 600;
  color: var(--color-accent-2);
}
.projects-more a:hover { text-decoration: underline; }

@media (max-width: 48em) {
  .projects-grid { grid-template-columns: 1fr; }
}

/* =========================================================
   STEPS ("Cómo trabajo")
   ========================================================= */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: var(--space-8);
}
.step-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.step-number {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: var(--text-body-lg);
  display: block;
  margin-bottom: var(--space-3);
}
.step-card h3 {
  font-family: var(--font-heading);
  font-size: var(--text-body-lg);
  margin-bottom: var(--space-2);
}
.step-card p {
  color: var(--color-text-muted-bg);
  font-size: var(--text-body-sm);
}

/* =========================================================
   CONTACT
   ========================================================= */
.section-contact { text-align: center; }
.contact-inner {
  max-width: 36rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.contact-actions { margin-bottom: var(--space-8); }
.contact-links {
  display: flex;
  gap: var(--space-8);
}
.contact-links a {
  font-weight: 600;
  color: var(--color-accent-2);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.contact-links a:hover { text-decoration: underline; }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted-bg);
}

/* =========================================================
   REVEAL ON SCROLL
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--duration-slow) var(--ease-standard),
              transform var(--duration-slow) var(--ease-standard);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn-primary:hover,
  .btn-ghost:hover,
  .project-card:hover {
    transform: none;
  }
}

/* =========================================================
   RESPONSIVE TYPE ADJUSTMENTS
   ========================================================= */
@media (max-width: 30em) {
  .hero { padding-block: var(--space-24) var(--space-16); }
  .section { padding-block: var(--space-16); }
  .contact-links { flex-direction: column; gap: var(--space-4); }
}