/* ─────────────────────────────────────────────────────────────
   styles.css — finlaycrawley.com
   Sections:
     1.  CSS Custom Properties
     2.  CSS Reset / Base
     3.  Typography
     4.  Layout utilities
     5.  Skip link
     6.  Navigation + hamburger
     7.  Hero section
     8.  About section
     9.  Projects grid + card components
     10. Contact section
     11. Footer
     12. Buttons
     13. Scroll animations
     14. Responsive breakpoints
───────────────────────────────────────────────────────────── */


/* ─── 1. CSS Custom Properties ──────────────────────────────── */

:root {
  /* Colours */
  --color-bg:              #0d0f12;
  --color-bg-surface:      #161920;
  --color-bg-elevated:     #1e2330;
  --color-border:          #2a2e3d;
  --color-text-primary:    #f0f2f7;   /* ~17:1 on bg — AAA */
  --color-text-secondary:  #9ba3b8;   /* ~7:1  on bg — AA  */
  --color-accent:          #7c9ef0;   /* ~6.5:1 on bg — AA  */
  --color-text-on-accent:  #0d0f12;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #161920, #0d0f12, #111827);

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                 Helvetica, Arial, sans-serif;
  --font-mono:   ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Monaco,
                 Consolas, 'Liberation Mono', monospace;

  /* Layout */
  --nav-height:    64px;
  --container-max: 1100px;

  /* Shape */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Motion */
  --transition-base: 200ms ease;
  --transition-card: 300ms ease;
}


/* ─── 2. CSS Reset / Base ────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-system);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  text-decoration: underline;
}

/* Remove default list styling for accessible lists */
ul[role="list"] {
  list-style: none;
}


/* ─── 3. Typography ──────────────────────────────────────────── */

h1,
h2,
h3,
h4 {
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

p {
  color: var(--color-text-secondary);
  max-width: 65ch;
}

code,
pre {
  font-family: var(--font-mono);
}


/* ─── 4. Layout utilities ────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.section {
  padding-block: 5rem;
}

/* Offset for fixed nav when scrolling to anchor */
section[id] {
  scroll-margin-top: var(--nav-height);
}

.section__heading {
  margin-bottom: 2.5rem;
}


/* ─── 5. Skip link ───────────────────────────────────────────── */

.skip-link {
  position: absolute;
  top: -999px;
  left: -999px;
  z-index: 9999;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: var(--color-text-on-accent);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
}

.skip-link:focus {
  top: 1rem;
  left: 1rem;
  text-decoration: none;
}


/* ─── 6. Navigation + hamburger ──────────────────────────────── */

.site-header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(13, 15, 18, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.nav {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-base);
  z-index: 110;
  position: relative;
}

.nav__logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav__logo:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Hamburger button */
.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-primary);
  z-index: 110;
  position: relative;
}

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

.nav__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transform-origin: center;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Animate bars into × when menu is open (uses aria-expanded) */
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav: full-screen overlay */
.nav__menu {
  position: fixed;
  inset: 0;
  top: var(--nav-height);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  list-style: none;
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.nav__menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.nav__link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  transition: color var(--transition-base), background-color var(--transition-base);
}

.nav__link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}


/* ─── 7. Hero section ────────────────────────────────────────── */

.hero {
  min-height: 100svh; /* modern browsers */
  min-height: 100vh;  /* fallback */
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  padding-top: calc(var(--nav-height) + 2rem);
}

.hero__inner {
  padding-block: 4rem;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
  max-width: none;
}

.hero__name {
  margin-bottom: 1.25rem;
}

.hero__tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.375rem);
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  max-width: 52ch;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}


/* ─── 8. About section ───────────────────────────────────────── */

.about {
  background: var(--color-bg-surface);
}

.about__inner {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.about__content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about__skills {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  align-self: flex-start;
}

.about__skills-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skills-list li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.6rem;
}


/* ─── 9. Projects grid + card components ─────────────────────── */

.projects {
  background: var(--color-bg);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.projects__placeholder {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  text-align: center;
  padding: 3rem 0;
}

.card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition:
    transform var(--transition-card),
    border-color var(--transition-card),
    box-shadow var(--transition-card);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 12px 40px rgba(124, 158, 240, 0.12);
}

.card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: rgba(124, 158, 240, 0.1);
  border: 1px solid rgba(124, 158, 240, 0.2);
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.6rem;
}

.card__ext-link {
  display: flex;
  padding: 0.25rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-base);
}

.card__ext-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

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

.card__title {
  color: var(--color-text-primary);
}

.card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  flex: 1;
  max-width: none;
}

.card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.card__tech li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.15rem 0.5rem;
}


/* ─── 10. Contact section ────────────────────────────────────── */

.contact {
  background: var(--color-bg-surface);
}

.contact__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact__blurb {
  font-size: 1.0625rem;
  max-width: 52ch;
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.contact__socials {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 0.5rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-base);
}

.social-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.social-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}


/* ─── 11. Footer ─────────────────────────────────────────────── */

.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-block: 2rem;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer__copy {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  max-width: none;
}

.footer__nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.footer__nav a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer__nav a:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.footer__nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}


/* ─── 12. Buttons ────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
  white-space: nowrap;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:active {
  transform: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-text-on-accent);
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: #96b3f5;
  border-color: #96b3f5;
  box-shadow: 0 4px 16px rgba(124, 158, 240, 0.35);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(124, 158, 240, 0.06);
}


/* ─── 13. Scroll animations ──────────────────────────────────── */

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: none;
}

/*
 * Prevent flash of invisible content if JS loads slowly.
 * The IIFE removes 'js-loading' on first line, so this only
 * applies for the brief moment before the script executes.
 */
.js-loading .animate-on-scroll {
  opacity: 1;
  transform: none;
}


/* ─── 14. Responsive breakpoints ─────────────────────────────── */

/* ≥ 600px — 2-column project grid */
@media (min-width: 600px) {
  .container {
    padding-inline: 2rem;
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer__nav ul {
    justify-content: flex-end;
  }
}

/* ≥ 768px — inline nav, two-column about */
@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__menu {
    position: static;
    flex-direction: row;
    gap: 0.25rem;
    opacity: 1;
    pointer-events: auto;
    background: transparent;
    justify-content: flex-end;
  }

  .nav__link {
    font-size: 0.9375rem;
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
  }

  .about__inner {
    flex-direction: row;
    gap: 4rem;
    align-items: flex-start;
  }

  .about__content {
    flex: 1;
  }

  .about__skills {
    flex: 0 0 260px;
  }
}

/* ≥ 900px — 3-column project grid */
@media (min-width: 900px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ≥ 1024px — larger section padding, wider container insets */
@media (min-width: 1024px) {
  .container {
    padding-inline: 2.5rem;
  }

  .section {
    padding-block: 7rem;
  }
}

/* Reduced motion — disable all transitions and animations */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
}