/* ============================================================
   Felipe Gutierrez — AI Consulting
   Mobile-first. One accent (teal). Light + dark.
   ============================================================ */

:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --surface-2: #f3f1ea;
  --ink: #191c1f;
  --muted: #5a616a;
  --border: #e5e1d8;
  --accent: #0f766e;
  --accent-hover: #0b5d56;
  --accent-soft: #e2f1ee;
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(20, 24, 28, .04), 0 8px 24px rgba(20, 24, 28, .06);
  --shadow-lift: 0 2px 6px rgba(20, 24, 28, .06), 0 18px 40px rgba(20, 24, 28, .10);
  --radius: 14px;
  --radius-sm: 10px;
  --wrap: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Inter", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1013;
    --surface: #14181b;
    --surface-2: #191e22;
    --ink: #e8eaec;
    --muted: #99a1a9;
    --border: #262c31;
    --accent: #2dd4bf;
    --accent-hover: #5fe3d2;
    --accent-soft: #123433;
    --on-accent: #04211d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
    --shadow-lift: 0 2px 6px rgba(0, 0, 0, .4), 0 18px 40px rgba(0, 0, 0, .5);
  }
}

/* Explicit theme override (viewer toggle) */
:root[data-theme="dark"] {
  --bg: #0d1013; --surface: #14181b; --surface-2: #191e22;
  --ink: #e8eaec; --muted: #99a1a9; --border: #262c31;
  --accent: #2dd4bf; --accent-hover: #5fe3d2; --accent-soft: #123433; --on-accent: #04211d;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  --shadow-lift: 0 2px 6px rgba(0,0,0,.4), 0 18px 40px rgba(0,0,0,.5);
}
:root[data-theme="light"] {
  --bg: #faf9f6; --surface: #ffffff; --surface-2: #f3f1ea;
  --ink: #191c1f; --muted: #5a616a; --border: #e5e1d8;
  --accent: #0f766e; --accent-hover: #0b5d56; --accent-soft: #e2f1ee; --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(20,24,28,.04), 0 8px 24px rgba(20,24,28,.06);
  --shadow-lift: 0 2px 6px rgba(20,24,28,.06), 0 18px 40px rgba(20,24,28,.10);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip; /* guard against horizontal scroll without breaking sticky header */
}

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; font-weight: 700; }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

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

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 20px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--on-accent);
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 100;
}
.skip-link:focus { left: 0; }

:where(a, button):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 12px 22px;
  border-radius: 999px; font-weight: 600; font-size: 1rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .12s ease, background-color .15s ease, border-color .15s ease, box-shadow .15s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--accent-hover); color: var(--on-accent); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { color: var(--ink); border-color: var(--accent); background: var(--surface); }
.btn-lg { min-height: 54px; padding: 15px 30px; font-size: 1.05rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 16px; }

.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 700; }
.brand:hover { color: var(--ink); }
.brand-mark {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--accent); color: var(--on-accent);
  font-weight: 800; font-size: 1.05rem; letter-spacing: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.05; font-size: 1.02rem; letter-spacing: -0.01em; }
.brand-sub { font-size: .72rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }

.nav { display: flex; align-items: center; }
.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 48px; height: 48px; padding: 12px; background: transparent; border: 0; cursor: pointer;
}
.nav-toggle span { height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-menu {
  list-style: none; margin: 0; padding: 0;
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--surface); border-bottom: 1px solid var(--border);
  display: none; flex-direction: column; gap: 2px; padding: 10px 20px 18px;
  box-shadow: var(--shadow);
}
.nav-menu.open { display: flex; }
.nav-menu a { display: block; color: var(--ink); font-weight: 600; padding: 12px 6px; min-height: 44px; }
.nav-menu a:hover { color: var(--accent); }
.nav-menu .nav-cta {
  margin-top: 6px; background: var(--accent); color: var(--on-accent);
  text-align: center; border-radius: 999px; padding: 13px 18px;
}
.nav-menu .nav-cta:hover { background: var(--accent-hover); color: var(--on-accent); }

/* ---------- Layout rhythm ---------- */
.section { padding: 64px 0; }
.section-alt { background: var(--surface-2); }
.section-head { max-width: 640px; margin-bottom: 36px; }
.section-head h2, .about-body h2, .contact h2 { font-size: clamp(1.6rem, 5vw, 2.15rem); margin: 8px 0 12px; }
.section-sub, .contact-sub { color: var(--muted); font-size: 1.05rem; }

.eyebrow {
  text-transform: uppercase; letter-spacing: .13em; font-size: .74rem;
  font-weight: 700; color: var(--muted); margin: 0;
}
.eyebrow-accent { color: var(--accent); }

/* ---------- Hero ---------- */
.hero { padding: 60px 0 52px; border-bottom: 1px solid var(--border); }
.hero-inner { max-width: 760px; }
.hero h1 { font-size: clamp(2.1rem, 8vw, 3.5rem); margin: 14px 0 18px; }
.lede { font-size: clamp(1.08rem, 3.5vw, 1.3rem); color: var(--muted); max-width: 42ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 30px; }
.hero-actions .btn { flex: 1 1 auto; min-width: 0; }

.trust-strip {
  list-style: none; margin: 0; padding: 20px 0 0; border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 8px 22px;
  font-size: .86rem; color: var(--muted); font-weight: 600;
}
.trust-strip li { position: relative; }
.trust-strip li + li::before {
  content: ""; position: absolute; left: -12px; top: 50%;
  width: 4px; height: 4px; border-radius: 50%; background: var(--accent); transform: translateY(-50%);
}

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: 1fr; gap: 16px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.card-num {
  font-size: .8rem; font-weight: 700; letter-spacing: .1em;
  color: var(--accent); margin-bottom: 12px;
}
.card h3 { font-size: 1.22rem; margin-bottom: 9px; }
.card p { color: var(--muted); font-size: .98rem; }

/* ---------- Differentiator banner ---------- */
.banner { background: var(--accent); color: var(--on-accent); padding: 56px 0; }
.banner-inner { max-width: 760px; }
.banner .eyebrow-accent { color: color-mix(in srgb, var(--on-accent) 78%, transparent); }
.banner-line { font-size: clamp(1.7rem, 6vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; margin: 10px 0 16px; }
.banner-body { font-size: 1.08rem; color: color-mix(in srgb, var(--on-accent) 90%, transparent); max-width: 56ch; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr; gap: 30px; align-items: start; }
.about-media { display: flex; }
.about-portrait {
  width: 96px; height: 96px; border-radius: 20px;
  display: grid; place-items: center;
  background: linear-gradient(140deg, var(--accent), var(--accent-hover));
  color: var(--on-accent); font-weight: 800; font-size: 2rem; letter-spacing: .02em;
  box-shadow: var(--shadow);
}
.about-body { display: flex; flex-direction: column; gap: 15px; max-width: 62ch; }
.about-body p { color: var(--muted); }
.about-body p:first-of-type { color: var(--ink); }

/* ---------- Steps ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr; gap: 16px; counter-reset: step; }
.step {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; display: grid; grid-template-columns: auto 1fr; gap: 6px 18px; align-items: center;
}
.step-num {
  grid-row: 1 / span 2;
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
  font-weight: 800; font-size: 1.2rem;
}
.step h3 { font-size: 1.15rem; align-self: end; }
.step p { color: var(--muted); font-size: .98rem; align-self: start; }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact-inner { max-width: 560px; margin-inline: auto; display: flex; flex-direction: column; align-items: center; gap: 14px; }
.contact-sub { margin-bottom: 6px; }
.contact-email { font-size: .95rem; color: var(--muted); }
.contact-phone { font-size: .95rem; color: var(--muted); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 34px 0; }
.footer-inner { display: flex; flex-direction: column; gap: 5px; text-align: center; }
.footer-brand { font-weight: 700; }
.footer-meta, .footer-copy { color: var(--muted); font-size: .9rem; }

/* ============================================================
   Breakpoints
   ============================================================ */
@media (min-width: 640px) {
  .cards { grid-template-columns: 1fr 1fr; gap: 18px; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .step { grid-template-columns: 1fr; text-align: left; align-content: start; gap: 12px; }
  .step-num { grid-row: auto; }
  .hero-actions .btn { flex: 0 0 auto; }
}

@media (min-width: 860px) {
  body { font-size: 17px; }
  .nav-toggle { display: none; }
  .nav-menu {
    position: static; display: flex; flex-direction: row; align-items: center; gap: 6px;
    background: transparent; border: 0; box-shadow: none; padding: 0;
  }
  .nav-menu a { padding: 9px 14px; }
  .nav-menu .nav-cta { margin-top: 0; padding: 11px 20px; }
  .section { padding: 88px 0; }
  .hero { padding: 92px 0 74px; }
  .section-head { margin-bottom: 48px; }
  .about-grid { grid-template-columns: 150px 1fr; gap: 44px; }
  .about-portrait { width: 132px; height: 132px; }
}

@media (min-width: 1000px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}