/* =============================================================================
   Joshua — High-Frequency Trading Headhunter
   Design system + styles for the portfolio scaffold.

   Typography is lifted faithfully from imflorea.dev (measured, not guessed):
     • Display / UI : Manrope 600, UPPERCASE, tracking -0.01em, line-height ~1.0
     • Body         : Mulish 400, 16px / 1.6
     • Labels / data: JetBrains Mono, UPPERCASE, tracking +0.1em
     • Ink #1F273A (dark navy, not black) · Body #4B5563 · Accent #455CE9
   ============================================================================= */

/* ----------------------------------------------------------------------------
   1. Design tokens
   ---------------------------------------------------------------------------- */
:root {
  /* Type families */
  --font-display: "Manrope", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-body: "Mulish", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* Fluid type scale — min → max tracks the imflorea measurements (96px display) */
  --fs-display: clamp(2.75rem, 1rem + 6.8vw, 5.5rem); /* hero          ~44 → 88px */
  --fs-h1: clamp(2rem, 1rem + 4.5vw, 3.5rem);         /* big statement ~32 → 56px */
  --fs-h2: clamp(1.5rem, 1.1rem + 1.6vw, 2rem);       /* section head  ~24 → 32px */
  --fs-h3: 1.5rem;                                     /* sub-item               24px */
  --fs-h4: 1.25rem;                                    /*                        20px */
  --fs-lead: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem); /* hero subhead  ~17 → 20px */
  --fs-body: 1rem;                                     /* body                   16px */
  --fs-sm: 0.875rem;                                   /*                        14px */
  --fs-label: 0.8125rem;                               /* mono eyebrow           13px */

  /* Rhythm */
  --lh-display: 1.0;
  --lh-tight: 1.1;
  --lh-body: 1.6;
  --tracking-display: -0.01em;
  --tracking-tight: -0.02em;
  --tracking-label: 0.14em;
  --measure: 62ch;            /* readable line length for body copy */

  /* Color */
  --ink: #1f273a;             /* headings — dark desaturated navy */
  --ink-2: #4b5563;           /* body text */
  --ink-3: #6b7280;           /* muted / captions */
  --bg: #ffffff;              /* page canvas */
  --bg-2: #fafbfc;            /* alternating panel */
  --line: #e6e8ec;            /* hairline borders */
  --line-2: #f0f1f4;          /* fainter hairline */
  --accent: #455ce9;          /* electric indigo (≈5.3:1 on white — AA) */
  --accent-hover: #3346c4;    /* darker indigo for hover */
  --accent-wash: #f1f3fe;     /* very light indigo tint */

  /* Layout */
  --container: 1200px;
  --gutter: clamp(1.25rem, 0.5rem + 3vw, 4rem);
  --section-y: clamp(4rem, 2rem + 8vw, 9rem);
  --radius: 4px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 200ms;

  /* Z-index scale */
  --z-nav: 50;
  --z-skip: 60;
}

/* ----------------------------------------------------------------------------
   2. Reset / base
   ---------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem; /* offset for fixed nav on anchor jumps */
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01" on, "cv01" on; /* tidy Manrope/Mulish alternates */
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul { list-style: none; padding: 0; }

::selection {
  background: var(--accent);
  color: #fff;
}

/* ----------------------------------------------------------------------------
   3. Typographic primitives
   ---------------------------------------------------------------------------- */
.display,
.h1,
.h2,
h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
  text-wrap: balance;
}

.display {
  font-size: var(--fs-display);
  line-height: var(--lh-display);
  letter-spacing: var(--tracking-display);
  text-transform: uppercase;
}

.h1 { font-size: var(--fs-h1); }
.h2 { font-size: var(--fs-h2); }
.h3 { font-size: var(--fs-h3); letter-spacing: -0.01em; }

.lead {
  font-size: var(--fs-lead);
  color: var(--ink-2);
  line-height: 1.5;
  max-width: var(--measure);
}

.prose { max-width: var(--measure); }
.prose p + p { margin-top: 1.1em; }

/* Monospace eyebrow / index label — the technical "signal" accent */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 400;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-3);
}
.eyebrow .num {
  color: var(--accent);
  font-weight: 600;
}
.eyebrow .num::after {
  content: "";
  display: inline-block;
  width: 1.75rem;
  height: 1px;
  margin-left: 0.6em;
  background: var(--line);
  vertical-align: middle;
}

.text-accent { color: var(--accent); }
.muted { color: var(--ink-3); }

/* ----------------------------------------------------------------------------
   4. Layout
   ---------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Editorial numbered section: label rail (left) + content (right), like the
   reference site. Collapses to a single column on small screens. */
.section {
  padding-block: var(--section-y);
  border-top: 1px solid var(--line);
}
.section--plain { border-top: none; }
.section--alt { background: var(--bg-2); }

.section__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 1rem + 3vw, 3.5rem);
}
@media (min-width: 880px) {
  .section__grid {
    grid-template-columns: minmax(160px, 0.4fr) minmax(0, 1.6fr);
  }
}
.section__head { position: sticky; top: 6rem; align-self: start; }
@media (max-width: 879px) {
  .section__head { position: static; }
}

/* ----------------------------------------------------------------------------
   5. Navigation
   ---------------------------------------------------------------------------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-nav);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--line); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 4.5rem;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.brand .dot {
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.5rem + 1.5vw, 2.25rem);
}
.nav__link {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--dur) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0.15rem;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__link:hover,
.nav__link:focus-visible { color: var(--ink); }
.nav__link:hover::after,
.nav__link:focus-visible::after { transform: scaleX(1); }

@media (max-width: 720px) {
  .nav__links .nav__link { display: none; }
  .nav__links .btn { display: inline-flex; }
}

/* ----------------------------------------------------------------------------
   6. Buttons
   ---------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 44px;            /* touch target */
  padding: 0.75rem 1.35rem;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  transition: background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
  white-space: nowrap;
}
.btn svg { width: 1em; height: 1em; transition: transform var(--dur) var(--ease); }
.btn:hover svg { transform: translateX(3px); }

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

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

.btn--ghost {
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn--ghost:hover { border-color: var(--ink); background: var(--bg-2); }

/* ----------------------------------------------------------------------------
   7. Hero
   ---------------------------------------------------------------------------- */
.hero {
  padding-top: clamp(8rem, 6rem + 8vw, 12rem);
  padding-bottom: var(--section-y);
  position: relative;
  overflow: hidden;
}
/* faint precision grid in the background — decorative, very low contrast */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-2) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-2) 1px, transparent 1px);
  background-size: clamp(48px, 6vw, 88px) clamp(48px, 6vw, 88px);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 0%, #000 40%, transparent 78%);
          mask-image: radial-gradient(ellipse 80% 70% at 30% 0%, #000 40%, transparent 78%);
  opacity: 0.7;
  pointer-events: none;
}
.hero__inner { position: relative; }

.hero__title { margin-top: 1.5rem; }
.hero__title .line { display: block; }
.hero__title .accent-line { color: var(--accent); }

.hero__lead { margin-top: 1.75rem; }

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.5rem;
}

/* Mono meta/stats strip under the hero */
.hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem 2rem;
  margin-top: clamp(3rem, 2rem + 4vw, 5rem);
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.stat .stat__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 1.2rem + 1.8vw, 2.5rem);
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat .stat__label {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ----------------------------------------------------------------------------
   8. "What I do" list
   ---------------------------------------------------------------------------- */
.services { display: grid; gap: 0; }
.service {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem 1.5rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}
.service:first-child { border-top: none; }
.service:hover { background: var(--bg-2); }
.service__num {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--accent);
  padding-top: 0.35rem;
}
.service__title { margin-bottom: 0.5rem; }
.service__desc { max-width: 56ch; }

/* ----------------------------------------------------------------------------
   9. Track record / logos
   ---------------------------------------------------------------------------- */
.proof {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: clamp(1.5rem, 1rem + 2vw, 3rem) 1.5rem;
}
.proof .stat__num { font-size: clamp(2rem, 1.4rem + 2.4vw, 3.25rem); }

.logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}
.logo-chip {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  color: var(--ink-2);
  padding: 0.65rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.logos-label {
  margin-top: 2.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.logos-label + .logos { margin-top: 0.9rem; }

.quote {
  margin-top: 3rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--accent);
}
.quote p {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-h3);
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.quote cite {
  display: block;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-style: normal;
  color: var(--ink-3);
}

/* ----------------------------------------------------------------------------
   10. Contact
   ---------------------------------------------------------------------------- */
.contact__title { margin-bottom: 1.5rem; }
.contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin-top: 2rem;
}
.contact__email {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 1rem + 2.2vw, 2.5rem);
  letter-spacing: -0.02em;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}
.contact__email:hover,
.contact__email:focus-visible { color: var(--accent); }
.contact__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin-top: 2.5rem;
}
.contact__meta a,
.contact__meta span {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  color: var(--ink-2);
}
.contact__meta a { transition: color var(--dur) var(--ease); }
.contact__meta a:hover { color: var(--accent); }

/* ----------------------------------------------------------------------------
   11. Footer
   ---------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--line);
  padding-block: 2.5rem;
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.footer small {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

/* ----------------------------------------------------------------------------
   11b. Developer-focused components (hero proof line, skill bridge, callout)
   ---------------------------------------------------------------------------- */

/* Single mono credibility line under the hero CTAs */
.hero__proof {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem 0.5rem;
  margin-top: clamp(2.5rem, 2rem + 3vw, 4rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.hero__proof strong { color: var(--ink); font-weight: 600; }

/* "Big Tech skill → HFT relevance" mapping list */
.bridge { margin-top: 1.75rem; }
.bridge li {
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  line-height: 1.5;
  color: var(--ink-2);
}
.bridge li:first-child { border-top: none; }
.bridge .arrow { color: var(--accent); padding: 0 0.6rem; }
.bridge .to { color: var(--ink); }
/* "expanding into" lane — flags the low-latency growth direction honestly */
.bridge .tag {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.12rem 0.5rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  vertical-align: middle;
  white-space: nowrap;
}

/* Objection-killer callout */
.callout {
  margin-top: 2rem;
  padding: 1.5rem 1.75rem;
  background: var(--accent-wash);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius);
}
.callout p {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-h4);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 54ch;
}
.callout strong { color: var(--accent); font-weight: 700; }

/* Inclusive note for in-industry engineers */
.inclusive {
  margin-top: 1.75rem;
  max-width: var(--measure);
  color: var(--ink-2);
}
.inclusive strong { color: var(--ink); font-weight: 600; }

/* ----------------------------------------------------------------------------
   12. Accessibility helpers
   ---------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0.5rem; left: 0.5rem;
  z-index: var(--z-skip);
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  transform: translateY(-150%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* Visible focus ring for keyboard users */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ----------------------------------------------------------------------------
   13. Motion — scroll reveal (progressive enhancement, off by default)
   ---------------------------------------------------------------------------- */
.anim .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.anim .reveal.is-in {
  opacity: 1;
  transform: none;
}
.anim .reveal:nth-child(2) { transition-delay: 60ms; }
.anim .reveal:nth-child(3) { transition-delay: 120ms; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}