/*
  styles.css
  Modern, neutral-dark, engineering-focused styling.
  - No UI framework required
  - Uses CSS variables for theme consistency
  - Respects prefers-reduced-motion
*/

:root{
  /* Colors (neutral, professional) */
  /* Light-grey / aluminum palette */
  --bg: #e6e8ec;
  --surface: #f1f3f6;
  --surface-2: #e9edf2;
  --border: rgba(16,24,32,.14);
  --text: rgba(16,24,32,.92);
  --muted: rgba(16,24,32,.70);
  --muted-2: rgba(16,24,32,.58);

  /* Accent kept restrained */
  /* Keep subtle cool accents so they don't fight the logo */
  --accent: #3b556e;
  --accent-rgb: 59, 85, 110;
  --accent-2: #6f7f93;

  /* Layout */
  --container: 1120px;
  --radius: 14px;

  /* Typography */
  /* System-first stack; swap in Inter if you later self-host it */
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

*{ box-sizing: border-box; }
html{ color-scheme: light; }
body{
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1100px 520px at 20% 0%, rgba(0,0,0,.05), transparent 62%),
    radial-gradient(900px 460px at 85% 10%, rgba(var(--accent-rgb), .07), transparent 64%),
    linear-gradient(180deg, rgba(0,0,0,.03), transparent 36%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

/* Accessibility */
.skip-link{
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  color: var(--text);
  padding: .75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 999;
}
.skip-link:focus{ left: 1rem; top: 1rem; }

.container{
  width: min(var(--container), calc(100% - 2rem));
  margin-inline: auto;
}

/* Header / Nav */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(241,243,246,.86);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 0;
  position: relative;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  text-decoration: none;
}

.brand img{
  height: 52px;
  width: auto;
  display: block;
}

.brand-text{
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--text);
  white-space: nowrap;
  font-size: 1.25rem;
}

@media (max-width: 460px){
  .brand img{ height: 46px; }
  .brand-text{ font-size: 1.05rem; }
}
.brand-mark{
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
}
.brand-name{
  font-weight: 650;
  letter-spacing: .01em;
}

.nav{
  position: absolute;
  right: 0;
  top: calc(100% + .5rem);
  padding: .75rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(241,243,246,.96);
  display: grid;
  grid-template-columns: 1fr;
  gap: .4rem;
  min-width: min(420px, calc(100vw - 2rem));
}

.nav a{
  text-decoration: none;
  padding: .55rem .75rem;
  border-radius: 10px;
  color: var(--muted);
  border: 1px solid transparent;
}
.nav a:hover{ color: var(--text); background: rgba(0,0,0,.03); }
.nav a[aria-current="page"]{
  color: var(--text);
  background: rgba(var(--accent-rgb), .10);
  border-color: rgba(var(--accent-rgb), .28);
}

.nav-toggle{
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  border: 1px solid var(--border);
  background: rgba(0,0,0,.03);
  color: var(--text);
  padding: .55rem .75rem;
  border-radius: 12px;
}

.nav[data-collapsed="true"]{ display: none; }

@media (max-width: 520px){
  .nav{ left: 0; right: 0; min-width: auto; }
}

/* Page Layout */
.main{
  padding: 2.25rem 0 3rem;
}

.page-title{
  font-size: clamp(1.55rem, 1.15rem + 1.2vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 .75rem;
}

.page-lede{
  color: var(--muted);
  margin: 0 0 1.5rem;
  max-width: 70ch;
}

.section{
  margin: 2rem 0;
}

.section h2{
  font-size: 1.15rem;
  letter-spacing: .01em;
  margin: 0 0 .75rem;
}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.70));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem;
}

.card h3{
  margin: 0 0 .4rem;
  font-size: 1.05rem;
}

.muted{ color: var(--muted); }
.small{ font-size: .95rem; color: var(--muted); }

.grid{
  display: grid;
  gap: 1rem;
}

.grid-2{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3{ grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px){
  .grid-3{ grid-template-columns: 1fr; }
}
@media (max-width: 760px){
  .grid-2{ grid-template-columns: 1fr; }
}

/* Hero */
.hero{
  padding: 2.25rem 0 1.5rem;
}
.hero-inner{
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1.3fr .7fr;
  align-items: start;
}

@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; }
}

.hero h1{
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 .85rem;
}

.hero p{
  margin: 0 0 1.15rem;
  color: var(--muted);
  max-width: 70ch;
}

.badge-row{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.badge{
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .45rem .65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.65);
  color: var(--muted);
  font-size: .92rem;
}

.dot{
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--accent);
  opacity: .9;
}

/* Buttons */
.btn-row{ display: flex; flex-wrap: wrap; gap: .65rem; }
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  text-decoration: none;
  padding: .75rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.70);
  color: var(--text);
  font-weight: 600;
}
.btn:hover{ border-color: rgba(16,24,32,.22); background: rgba(255,255,255,.82); }
.btn-primary{
  border-color: rgba(var(--accent-rgb), .38);
  background: linear-gradient(180deg, rgba(var(--accent-rgb), .16), rgba(var(--accent-rgb), .08));
}
.btn-primary:hover{ border-color: rgba(var(--accent-rgb), .58); }

/* Lists */
.ul{
  margin: .5rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
}
.ul li{ margin: .25rem 0; }

.tech{
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: .75rem;
}
.tech span{
  font-family: var(--mono);
  font-size: .85rem;
  padding: .25rem .45rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.65);
  color: var(--muted);
}

/* Footer */
.footer{
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  color: var(--muted);
}

.footer-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer a{
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.footer a:hover{ color: var(--text); border-bottom-color: rgba(16,24,32,.25); }

/* Forms */
.form{
  display: grid;
  gap: .85rem;
  max-width: 680px;
}

.field{
  display: grid;
  gap: .35rem;
}

label{ color: var(--muted); font-weight: 600; font-size: .95rem; }

input, textarea{
  width: 100%;
  padding: .75rem .85rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.70);
  color: var(--text);
  outline: none;
}

input:focus, textarea:focus{
  border-color: rgba(var(--accent-rgb), .50);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .14);
}

textarea{ min-height: 140px; resize: vertical; }

.helper{
  font-size: .92rem;
  color: var(--muted-2);
}

.notice{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.70);
  border-radius: 14px;
  padding: .85rem 1rem;
  color: var(--muted);
}

.notice strong{ color: var(--text); }

/* Subtle reveal animation */
.reveal{ opacity: 0; transform: translateY(10px); }
.reveal.is-visible{ opacity: 1; transform: translateY(0); transition: opacity 600ms ease, transform 600ms ease; }

@media (prefers-reduced-motion: reduce){
  .reveal, .reveal.is-visible{ opacity: 1; transform: none; transition: none; }
  html{ scroll-behavior: auto; }
}

/* Utility */
.hr{
  height: 1px;
  background: var(--border);
  border: 0;
  margin: 1.25rem 0;
}