/* ==========================================================================
   Dukeelabs Portfolio — Base Styles
   Design tokens, reset, typography, layout primitives, header/footer, hero
   ========================================================================== */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- Design tokens ---------- */
:root{
  --bg-shift-x: 0px;
  --bg-shift-y: 0px;

  /* Core palette — dark by default */
  --bg:            #0F1117;
  --bg-raised:     #181C24;
  --bg-sunken:     #12161D;
  --text:          #F5F7FA;
  --text-muted:    #A1A8B3;
  --text-faint:    #7A828D;
  --border:        #232835;
  --border-strong: #2F3642;

  /* Signal accents */
  --accent:        #5B8CFF;
  --accent-strong: #7AA3FF;
  --accent-soft:   rgba(91, 140, 255, 0.16);
  --accent-secondary: #3DD9B3;
  --accent-text:   #08111F;

  /* Semantic */
  --success: #3DD9B3;
  --danger:  #FF7B72;

  /* Elevation */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.18), 0 1px 1px rgba(0,0,0,0.10);
  --shadow-md: 0 10px 24px rgba(0, 0, 0, 0.18);
  --shadow-lg: 0 18px 40px rgba(0, 0, 0, 0.24);

  /* Type */
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Layout */
  --content-width: 1120px;
  --content-pad: 24px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --body-font-size: 13px;
  --nav-height: 72px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 150ms;
  --dur-med: 320ms;
}

/* ---------- Theme variants ---------- */
html[data-theme="light"]{
  --bg:            #F4F6FA;
  --bg-raised:     #FFFFFF;
  --bg-sunken:     #EEF1F6;
  --text:          #111827;
  --text-muted:    #556172;
  --text-faint:    #7A879A;
  --border:        #E5EAF2;
  --border-strong: #D8E0EA;
  --accent-soft:   rgba(91, 140, 255, 0.12);
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.04), 0 1px 1px rgba(17,24,39,0.03);
  --shadow-md: 0 10px 24px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 18px 40px rgba(17, 24, 39, 0.12);
}

html{ color-scheme: dark; }
html[data-theme="light"]{ color-scheme: light; }

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd{ margin: 0; }
ul[class], ol[class]{ list-style: none; margin: 0; padding: 0; }
img, picture, svg{ display: block; max-width: 100%; }
input, button, textarea, select{ font: inherit; color: inherit; }
a{ color: inherit; text-decoration: none; }
button{ background: none; border: none; cursor: pointer; }

body{
  position: relative;
  isolation: isolate;
  background:
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255,255,255,0.015) 1px, transparent 1px),
    radial-gradient(circle at 18% 16%, rgba(91, 140, 255, 0.12) 0%, transparent 26%),
    radial-gradient(circle at 84% 12%, rgba(61, 217, 179, 0.10) 0%, transparent 24%),
    linear-gradient(135deg, #07080b 0%, #0e1117 45%, #06070a 100%);
  background-size: 72px 72px, 72px 72px, auto, auto, auto;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--body-font-size);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  cursor: none;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur-med) var(--ease), color var(--dur-med) var(--ease);
}

body::before,
body::after{
  content: '';
  position: fixed;
  pointer-events: none;
  z-index: -1;
}

body::before{
  inset: -12% -8% auto auto;
  width: 34vw;
  height: 34vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0) 72%);
  filter: blur(18px);
  animation: pulseGlow 18s ease-in-out infinite alternate;
  transform: translate3d(var(--bg-shift-x), var(--bg-shift-y), 0);
}

body::after{
  inset: auto auto -14% -8%;
  width: 30vw;
  height: 30vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(91, 140, 255, 0.08) 0%, rgba(91, 140, 255, 0) 72%);
  filter: blur(16px);
  animation: pulseGlowAlt 20s ease-in-out infinite alternate;
  transform: translate3d(calc(var(--bg-shift-x) * 0.6), calc(var(--bg-shift-y) * 0.6), 0);
}

.cursor-dot,
.cursor-ring{
  position: fixed;
  left: 0;
  top: 0;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 9999;
}

.cursor-dot{
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(91, 140, 255, 0.95);
  box-shadow: 0 0 0 1px rgba(91, 140, 255, 0.24);
}

.cursor-ring{
  width: 34px;
  height: 34px;
  border: 1px solid rgba(91, 140, 255, 0.35);
  border-radius: 50%;
  transition: width 180ms ease, height 180ms ease, border-color 180ms ease, opacity 180ms ease;
}

body.is-hovering .cursor-ring{
  width: 44px;
  height: 44px;
  border-color: rgba(61, 217, 179, 0.7);
}

body.is-clicking .cursor-dot{
  transform: translate(-50%, -50%) scale(0.72);
}

body.is-clicking .cursor-ring{
  width: 28px;
  height: 28px;
}

@keyframes pulseGlow{
  0%{ transform: translate3d(0, 0, 0) scale(1); opacity: 0.7; }
  100%{ transform: translate3d(4%, -3%, 0) scale(1.05); opacity: 1; }
}

@keyframes pulseGlowAlt{
  0%{ transform: translate3d(0, 0, 0) scale(1); opacity: 0.6; }
  100%{ transform: translate3d(-4%, 3%, 0) scale(1.06); opacity: 0.95; }
}

/* Visible keyboard focus */
a:focus-visible, button:focus-visible, input:focus-visible,
textarea:focus-visible, [tabindex]:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--text);
}
h1{ font-size: clamp(1.6rem, 2.8vw, 2.45rem); font-weight: 700; }
h2{ font-size: clamp(1.2rem, 1.9vw, 1.6rem); }
h3{ font-size: 0.95rem; }
h4{ font-size: 0.9rem; }

p{ color: var(--text-muted); font-size: 0.85rem; }
.lead{ font-size: 0.9rem; color: var(--text-muted); }

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before{
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

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

/* ---------- Layout ---------- */
.container{
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}
.section{
  padding-block: clamp(56px, 8.2vw, 112px);
}
.section-head{
  max-width: 640px;
  margin-bottom: 44px;
}
.section-head h2{ margin-top: 10px; }
.section-head p{ margin-top: 14px; }

/* Fade-in-on-scroll utility (driven by main.js IntersectionObserver) */
.reveal{
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 640ms var(--ease), transform 640ms var(--ease);
}
.reveal.is-visible{
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
  white-space: nowrap;
  text-decoration: none;
}
.btn-lg{
  padding: 12px 20px;
  font-size: 0.95rem;
  min-height: 44px;
}
.btn:active{ transform: translateY(1px); }

.btn-primary{
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
  color: var(--accent-text);
}
.btn-primary:hover{ filter: brightness(1.05); box-shadow: var(--shadow-sm); }

.btn-secondary{
  background: var(--bg-raised);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-secondary:hover{ border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--bg-raised) 86%, var(--accent-soft)); }

.btn-ghost{
  background: transparent;
  color: var(--text-muted);
  padding-inline: 12px;
}
.btn-ghost:hover{ color: var(--accent); }

.btn-sm{ padding: 7px 12px; font-size: 0.78rem; }
.btn-block{ width: 100%; }

.btn svg{ width: 16px; height: 16px; flex-shrink: 0; }
.btn .btn-icon{ width: 18px; height: 18px; }
.hero-actions .btn{ min-width: 186px; }
.cta-band-actions .btn{ min-width: 176px; }

/* ---------- Header / Navigation ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand-mark{
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
}
.brand-sub{
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
}

.nav-links{
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a{
  position: relative;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--dur-fast) var(--ease);
}
.nav-links a::after{
  content: '';
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease);
}
.nav-links a:hover{ color: var(--text); }
.nav-links a:hover::after{ transform: scaleX(1); }
.nav-links a.is-active{ color: var(--text); }
.nav-links a.is-active::after{ transform: scaleX(1); }

.nav-actions{ display: flex; align-items: center; gap: 10px; }

.theme-toggle{
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.theme-toggle:hover{ border-color: var(--accent); color: var(--accent); }
.theme-toggle svg{ width: 17px; height: 17px; }
.theme-toggle .icon-sun{ display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon{ display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun{ display: block; }

.nav-toggle{
  display: none;
  width: 38px; height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  align-items: center;
  justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content: '';
  display: block;
  width: 16px; height: 2px;
  background: var(--text);
  position: relative;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}
.nav-toggle span::before{ position: absolute; top: -5px; }
.nav-toggle span::after{ position: absolute; top: 5px; }
.nav-toggle[aria-expanded="true"] span{ background: transparent; }
.nav-toggle[aria-expanded="true"] span::before{ top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after{ top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero{
  padding-block: clamp(72px, 12vw, 132px) clamp(56px, 8vw, 96px);
  border-bottom: 1px solid var(--border);
}
.hero-inner{ max-width: 760px; }
.hero .eyebrow{ margin-bottom: 18px; }
.hero h1{ margin-bottom: 20px; }
.hero .lead{ max-width: 560px; margin-bottom: 34px; }
.hero-actions{ display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }

.hero-meta{
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.hero-meta-item{ display: flex; flex-direction: column; gap: 4px; }
.hero-meta-item .num{
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text);
}
.hero-meta-item .label{
  font-size: 0.78rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- Footer ---------- */
.site-footer{
  border-top: 1px solid var(--border);
  padding-block: 48px;
  margin-top: 40px;
}
.footer-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-brand{ display: flex; flex-direction: column; gap: 6px; }
.footer-brand .brand{ font-size: 0.95rem; }
.footer-brand p{ font-size: 0.85rem; color: var(--text-faint); }

.social-links{ display: flex; gap: 10px; }
.social-links a{
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.social-links a:hover{ border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.social-links svg{ width: 16px; height: 16px; }

.footer-bottom{
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
}