/* -----------------------------
   Design system
------------------------------ */
:root{
  --bg: #0b1220;
  --panel: rgba(255,255,255,0.06);
  --panel-2: rgba(255,255,255,0.09);
  --border: rgba(255,255,255,0.10);
  --text: rgba(255,255,255,0.90);
  --muted: rgba(255,255,255,0.65);
  --link: rgba(255,255,255,0.95);

  --shadow: 0 10px 28px rgba(0,0,0,0.35);
  --radius: 16px;

  --max: 1160px;

  --h1: clamp(2rem, 3vw, 2.6rem);
  --h2: 1.25rem;
  --h3: 1.05rem;
  --body: 1rem;

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;

     --heading: rgba(255,255,255,0.95);
  --subheading: rgba(255,255,255,0.82);

  --pill-purple: #7c3aed;
  --pill-purple-hover: #6d28d9;

  --pill-green: #10b981;
  --pill-green-hover: #059669;
}

/* Optional light mode (auto if user prefers light) */
@media (prefers-color-scheme: light){
  :root{
    --bg: #f6f7fb;
    --panel: rgba(0,0,0,0.03);
    --panel-2: rgba(0,0,0,0.05);
    --border: rgba(0,0,0,0.10);
    --text: rgba(0,0,0,0.88);
    --muted: rgba(0,0,0,0.62);
    --link: rgba(0,0,0,0.92);
    --shadow: 0 10px 28px rgba(0,0,0,0.10);

         --heading: rgba(0,0,0,0.90);
    --subheading: rgba(0,0,0,0.72);
  }
}

/* -----------------------------
   Base
------------------------------ */
*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, Helvetica, sans-serif;
  font-size: var(--body);
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 15% -10%, rgba(110,231,183,0.18), transparent 60%),
    radial-gradient(900px 600px at 90% 0%, rgba(59,130,246,0.20), transparent 55%),
    radial-gradient(700px 500px at 60% 105%, rgba(168,85,247,0.16), transparent 55%),
    var(--bg);
}

/* Links */
a{ color: var(--link); text-decoration: none; }
a:hover{ text-decoration: underline; }

/* -----------------------------
   Header
------------------------------ */
header{
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-4);
}
header .hero{
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: var(--space-5);
  box-shadow: var(--shadow);
}
header h1{
  font-size: var(--h1);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}
header .subtitle{
  color: var(--muted);
  margin-top: var(--space-1);
}
header .links{
  margin-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}


/* Header pills: colored primary actions */
header .pill{
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow: 0 8px 18px rgba(0,0,0,0.18);
  transition: transform 140ms ease, filter 140ms ease, background 140ms ease;
}

/* GitHub = purple */
header .pill[href*="github.com"]{
  background: linear-gradient(180deg, rgba(124,58,237,0.98), rgba(109,40,217,0.98));
  border-color: rgba(124,58,237,0.35);
  color: white;
}

/* APK = green */
header .pill[href$=".apk"],
header .pill[href*=".apk"]{
  background: linear-gradient(180deg, rgba(16,185,129,0.98), rgba(5,150,105,0.98));
  border-color: rgba(16,185,129,0.35);
  color: white;
}

/* Hover states */
header .pill:hover{
  transform: translateY(-2px);
  filter: brightness(1.05);
  text-decoration: none;
}

/* Keyboard focus */
header .pill:focus-visible{
  outline: 3px solid rgba(59,130,246,0.45);
  outline-offset: 3px;
}

/* -----------------------------
   Layout
------------------------------ */
.layout{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-5);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-4);
}

/* Sidebar */
.sidebar{
  position: relative;
}
.sidebar-inner{
  position: sticky;
  top: var(--space-4);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}
.sidebar-title{
  font-weight: 700;
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}
.sidebar-list{
  list-style: none;
  display: grid;
  gap: 0.25rem;
}
.sidebar-list a{
  display: block;
  padding: 0.6rem 0.7rem;
  border-radius: 12px;
  color: var(--muted);
  border: 1px solid transparent;
  transition: background 120ms ease, border-color 120ms ease;
}
.sidebar-list a:hover{
     color: var(--text);
  background: rgba(255,255,255,0.06);
  border-color: var(--border);
  text-decoration: none;
}

.sidebar-list a.active {
  background: rgba(59,130,246,0.15);
  color: white;
  font-weight: 600;
}

/* Optional action buttons (if you add them) */
.sidebar-actions{
  margin-top: var(--space-3);
  display: flex;
  gap: var(--space-2);
}
.button{
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.05);
  color: var(--text);
  padding: 0.6rem 0.75rem;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}
.button:hover{
  background: rgba(255,255,255,0.09);
  transform: translateY(-1px);
}

/* Main content */
main{
  padding-bottom: var(--space-5);
 min-width: 0;
  max-width: 760px;
}

/* -----------------------------
   Collapsible sections
------------------------------ */
details.section,
details.subsection{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: var(--space-3);
}

details.section{
  background: rgba(255,255,255,0.03);
}

details.subsection{
  margin-top: var(--space-3);
  margin-bottom: var(--space-3);
  border-radius: 14px;
  box-shadow: none; /* nested should be calmer */
  background: rgba(255,255,255,0.02);
}

summary{
  list-style: none;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

summary::-webkit-details-marker{ display:none; }

/* nice chevron */
summary::before{
  content: "";
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 140ms ease;
  margin-right: 0.1rem;
}
details[open] > summary::before{
  transform: rotate(45deg);
}

.summary-title{
  font-size: var(--h2);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--heading);
}

.summary-subtitle{
  font-size: var(--h3);
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--subheading);
}

.section-content{
  padding: 1.1rem 1.4rem 1.35rem;
}

/* typography inside content */
.section-content h3{
  margin-top: 1.1rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
  opacity: 0.95;
}
.section-content p{
  margin: 0.75rem 0 1.4rem;
  line-height: 1.75;
color: var(--text);
}
.section-content .muted{
  color: var(--muted);
}

ul, ol{
  margin: 0.5rem 0 1rem 1.2rem;
}
li{ margin: 0.25rem 0; color: var(--text); }

/* Media */
figure{ margin: 1.2rem 0; }
figure img{
  width: 100%;
  max-width: 760px;
  border-radius: 14px;
  border: 1px solid var(--border);
  display: block;
  box-shadow: 0 10px 20px rgba(0,0,0,0.25);
}
figcaption{
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Tables */
.heuristics-table{
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  overflow: hidden;
  border-radius: 14px;
}
.heuristics-table th,
.heuristics-table td{
  border: 1px solid var(--border);
  padding: 0.75rem;
  vertical-align: top;
}
.heuristics-table th{
  background: rgba(255,255,255,0.06);
  text-align: left;
}

/* Footer */
footer{
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--space-4);
  color: var(--muted);
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.08);
}

/* Responsive */
@media (max-width: 960px){
  .layout{ grid-template-columns: 1fr; }
  .sidebar-inner{ position: static; }
  header{ padding-bottom: var(--space-3); }
  header .hero{ padding: var(--space-4); }
}

:root{
  --link-blue: #3b82f6;
  --link-blue-hover: #2563eb;
}

@media (prefers-color-scheme: light){
  :root{
    --link-blue: #2563eb;
    --link-blue-hover: #1d4ed8;
  }
}

main a,
.section-content a,
footer a{
  color: var(--link-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}
  
main a:hover,
.section-content a:hover,
footer a:hover{
  color: var(--link-blue-hover);
}

header a.pill{
  text-decoration: none;
}