/*
  Main stylesheet (lightweight, responsive, WCAG-friendly)
  - No external frameworks
  - Uses system fonts for speed
  - Uses CSS variables for theme + accessibility toggles
*/

:root{
  /* Default theme: dark, modern blue (as requested) */
  --bg: #000000;
  --surface: #071a3a;
  --text: #eaf2ff;
  --muted: #b6c7e6;
  --border: rgba(59, 130, 246, 0.22);
  --brand: #3b82f6;      /* blue */
  --brand-2: #0ea5e9;    /* sky */
  --good: #15803d;
  --warn: #b45309;
  --bad: #b91c1c;

  /* Sizing */
  --radius: 14px;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.55);

  /* Typography */
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Base font size (adjusted by JS font-size toggle) */
  --base-font: 16px;
}

/* Light mode (via JS toggle sets [data-theme="light"]) */
:root[data-theme="light"]{
  --bg: #ffffff;
  --surface: #f1f6ff;
  --text: #111827;
  --muted: #334155;
  --border: #dbeafe;
  --brand: #2563eb;
  --brand-2: #0ea5e9;
  --shadow: 0 10px 30px rgba(17, 24, 39, 0.08);
}

/* Larger font mode (via JS toggle sets [data-font="lg"]) */
:root[data-font="lg"]{
  --base-font: 18px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  font-family: var(--font);
  font-size: var(--base-font);
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

a{ color: var(--brand); text-underline-offset: 3px; }
a:hover{ color: color-mix(in srgb, var(--brand) 85%, #1e3a8a); }
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
summary:focus-visible{
  outline: 3px solid rgba(14, 165, 233, 0.65);
  outline-offset: 2px;
  border-radius: 8px;
}

/* Layout */
.container{
  width: min(1100px, calc(100% - 2rem));
  margin-inline: auto;
}

/* Make the navbar feel wider without stretching all page content */
.site-header .container{
  width: min(1320px, calc(100% - 1.25rem));
}

.skip-link{
  position: absolute;
  left: -9999px;
  top: 0.75rem;
  z-index: 1000;
  padding: 0.6rem 0.9rem;
  background: var(--text);
  color: var(--bg);
  border-radius: 10px;
}
.skip-link:focus{ left: 1rem; }

/* Header / Nav */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  /* Slightly more colored, but still academic and subtle */
  background:
    linear-gradient(90deg,
      color-mix(in srgb, var(--brand) 10%, var(--bg)),
      color-mix(in srgb, var(--brand-2) 8%, var(--bg))
    );
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--brand) 16%, var(--border));
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.06);
}

/* Accent bar for clearer branding */
.site-header::before{
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-2), var(--brand));
}

.navbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand{
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  text-decoration: none;
}

.brand-mark{
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: radial-gradient(circle at 25% 25%, var(--brand-2), var(--brand));
  box-shadow: var(--shadow);
  flex: 0 0 auto;
}

.brand-text{ display: grid; line-height: 1.15; }
.brand-text strong{ font-size: 0.98rem; }
.brand-text span{ font-size: 0.82rem; color: var(--muted); }

.nav-controls{
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 78%, var(--bg));
  color: var(--text);
  cursor: pointer;
}
.icon-btn:hover{ filter: brightness(0.98); }
.icon{ width: 18px; height: 18px; fill: currentColor; }

.nav-toggle{ display: none; }

.nav-links{
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.nav-links a{
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.7rem;
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 600;
}
.nav-links a[aria-current="page"]{
  background: color-mix(in srgb, var(--brand) 18%, var(--bg));
  border-color: color-mix(in srgb, var(--brand) 38%, var(--border));
}
.nav-links a:hover{
  background: color-mix(in srgb, var(--brand-2) 10%, var(--surface));
  border-color: color-mix(in srgb, var(--brand-2) 22%, var(--border));
}

/* Mobile nav */
@media (max-width: 860px){
  .nav-toggle{ display: inline-flex; }
  .nav-links{
    display: none;
    width: 100%;
    padding: 0.8rem;
    background: color-mix(in srgb, var(--surface) 86%, var(--bg));
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }
  .nav-links.is-open{ display: grid; grid-template-columns: 1fr; }
  .navbar{ flex-wrap: wrap; }
}

/* Page */
main{ padding: 2rem 0 3rem; }

.page-title{
  margin: 0 0 0.6rem;
  font-size: clamp(1.55rem, 2.2vw, 2.1rem);
  letter-spacing: -0.02em;
}

.lead{ margin: 0; color: var(--muted); max-width: 75ch; }

/* Hero */
.hero{
  padding: 1.4rem 0 0;
}

.hero-card{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.4rem;
  padding: 1.4rem;
  border-radius: calc(var(--radius) + 6px);
  background:
    linear-gradient(180deg,
      color-mix(in srgb, var(--brand) 10%, var(--surface)),
      color-mix(in srgb, var(--brand-2) 7%, var(--bg))
    );
  border: 1px solid color-mix(in srgb, var(--brand) 18%, var(--border));
  box-shadow: var(--shadow);
}

@media (max-width: 860px){
  .hero-card{ grid-template-columns: 1fr; }
}

.kicker{
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--muted);
}
.kicker-badge{
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 72%, var(--surface));
  font-family: var(--mono);
  font-size: 0.78rem;
}

.hero h1{
  margin: 0.6rem 0 0.7rem;
  font-size: clamp(2.0rem, 3.3vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero p{ margin: 0 0 1.1rem; color: var(--muted); max-width: 72ch; }

.cta-row{ display: flex; flex-wrap: wrap; gap: 0.7rem; }

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 0.95rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 72%, var(--bg));
}

.btn.primary{
  background: linear-gradient(180deg, color-mix(in srgb, var(--brand-2) 25%, var(--brand)), var(--brand));
  color: white;
  border-color: color-mix(in srgb, var(--brand) 70%, #000);
}
.btn.primary:hover{ filter: brightness(1.03); }

.btn.ghost:hover{ background: color-mix(in srgb, var(--surface) 82%, var(--bg)); }

/* Feature cards */
.grid{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.card{
  grid-column: span 6;
  padding: 1rem;
  border: 1px solid color-mix(in srgb, var(--brand) 14%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 88%, var(--bg));
  position: relative;
}

/* Subtle blue accent on cards (keeps it modern, not flashy) */
.card::before{
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  border-top-left-radius: var(--radius);
  border-top-right-radius: var(--radius);
  background: linear-gradient(90deg, var(--brand-2), var(--brand));
  opacity: 0.55;
}

@media (max-width: 860px){
  .card{ grid-column: span 12; }
}

.card h3{ margin: 0 0 0.4rem; font-size: 1.05rem; }
.card p{ margin: 0; color: var(--muted); }

.card-top{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.pill{
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.82rem;
  border: 1px solid color-mix(in srgb, var(--brand) 18%, var(--border));
  color: color-mix(in srgb, var(--text) 86%, var(--brand));
  background: color-mix(in srgb, var(--brand) 8%, var(--surface));
}

.section{
  margin-top: 2rem;
}
.section h2{
  margin: 0 0 0.6rem;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.section .hint{ margin: 0 0 1rem; color: var(--muted); }

/* Content blocks */
.prose{
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--brand) 14%, var(--border));
  background: color-mix(in srgb, var(--surface) 88%, var(--bg));
}
.prose p{ margin: 0.6rem 0; color: var(--muted); }
.prose ul{ margin: 0.6rem 0; padding-left: 1.2rem; color: var(--muted); }
.prose li{ margin: 0.35rem 0; }

/* Icons in headings */
.h2-row{ display: inline-flex; align-items: center; gap: 0.5rem; }
.h2-row .icon{
  width: 20px;
  height: 20px;
  color: var(--brand);
}

/* Accordions (Milestones) */
.timeline{
  display: grid;
  gap: 0.75rem;
}

details.accordion{
  border: 1px solid color-mix(in srgb, var(--brand) 14%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 88%, var(--bg));
  overflow: clip;
}

details.accordion > summary{
  list-style: none;
  cursor: pointer;
  padding: 0.95rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

details.accordion > summary::-webkit-details-marker{ display: none; }

.summary-main{ display: grid; gap: 0.2rem; }
.summary-main strong{ font-size: 1rem; }
.summary-main span{ color: var(--muted); font-size: 0.9rem; }

.kpi{
  display: inline-flex;
  gap: 0.4rem;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 80%, var(--bg));
  color: var(--text);
}

.accordion-body{ padding: 0 1rem 1rem; color: var(--muted); }
.accordion-grid{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0.8rem;
}

.accordion-grid .mini{
  grid-column: span 6;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--surface) 70%, var(--bg));
}

@media (max-width: 860px){
  .accordion-grid .mini{ grid-column: span 12; }
}

.mini strong{ display: block; margin-bottom: 0.25rem; color: var(--text); }

/* Tables (Documents) */
.table{
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--brand) 14%, var(--border));
}

.table th,
.table td{
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.table th{ background: color-mix(in srgb, var(--surface) 75%, var(--bg)); }
.table td{ color: var(--muted); }

.badge{
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.82rem;
  font-family: var(--mono);
}

.badge.good{ color: var(--good); }
.badge.warn{ color: var(--warn); }
.badge.bad{ color: var(--bad); }

/* Cards for presentations */
.deck{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.deck .card{ grid-column: span 6; }
@media (max-width: 860px){
  .deck .card{ grid-column: span 12; }
}

/* Profile rows (used for supervisors) */
.profile{
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
}

@media (max-width: 520px){
  .profile{ flex-direction: column; }
}

.avatar{
  width: 72px;
  height: 72px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 75%, var(--surface));
  object-fit: cover;
  flex: 0 0 auto;
}

.profile-meta{ display: grid; gap: 0.25rem; }
.profile-meta .title{ color: var(--muted); font-size: 0.92rem; }

.embed{
  width: 100%;
  height: 320px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg) 78%, var(--surface));
}

/* Forms */
.form{
  display: grid;
  gap: 0.9rem;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 88%, var(--bg));
}

.field{ display: grid; gap: 0.35rem; }
label{ font-weight: 600; }
input, textarea{
  width: 100%;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 70%, var(--bg));
  color: var(--text);
}
textarea{ min-height: 140px; resize: vertical; }
.help{ color: var(--muted); font-size: 0.9rem; }

.notice{
  padding: 0.85rem 0.9rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 88%, var(--bg));
  color: var(--muted);
}

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

/* Footer */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 1.4rem 0;
  background: color-mix(in srgb, var(--surface) 25%, var(--bg));
}

.footer-row{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.footer-row small{ color: var(--muted); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ transition: none !important; animation: none !important; }
}