@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root{
  --bg:#0f172a;
  --surface:#161f36;
  --border:#233049;
  --text:#f1f5f9;
  --text-muted:#8b98b3;
  --accent:#3b82f6;
  --accent-hover:#2563eb;
}

*{box-sizing:border-box;}

body{
  margin:0;
  font-family:'Inter',Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{color:inherit;text-decoration:none;}

.container{
  max-width:1100px;
  margin:0 auto;
  padding:0 clamp(24px,5vw,64px);
}

/* HEADER */
header{
  position:sticky;
  top:0;
  background:rgba(15,23,42,.9);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--border);
  z-index:10;
}

header .bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 12px;
}

.logo{
  font-size:19px;
  font-weight:700;
  letter-spacing:-0.01em;
}

.logo span{color:var(--accent);}

nav{
  display:flex;
  gap:36px;
  position:absolute;
  left:50%;
  transform:translateX(-50%);
}

nav a{
  font-size:14.5px;
  font-weight:500;
  color:var(--text-muted);
  padding-bottom:4px;
  border-bottom:2px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}

nav a:hover,
nav a[aria-current="page"]{
  color:var(--text);
  border-color:var(--accent);
}

.header-actions{display:flex;}

.btn{
  display:inline-block;
  background:var(--accent);
  color:#fff;
  padding:10px 20px;
  border-radius:8px;
  font-size:14px;
  font-weight:600;
  transition:background .2s ease;
}

.btn:hover{background:var(--accent-hover);}

.btn-outline{
  background:transparent;
  border:1px solid var(--border);
  color:var(--text);
}

.btn-outline:hover{background:var(--surface);border-color:var(--accent);}

/* mobile nav layout fallback */
@media (max-width:760px){
  header .bar{flex-wrap:wrap;gap:14px;justify-content:center;}
  nav{position:static;transform:none;gap:22px;order:3;width:100%;justify-content:center;}
}

/* HERO */
.hero{
  padding:70px 20px 60px;
  text-align:center;
}

.hero .eyebrow{
  font-size:13px;
  font-weight:600;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--accent);
  margin:0 0 14px;
}

.hero h2{
  font-size:clamp(32px,5vw,52px);
  font-weight:700;
  line-height:1.1;
  margin:0 0 16px;
  letter-spacing:-0.01em;
}

.hero p{
  font-size:17px;
  color:var(--text-muted);
  max-width:520px;
  margin:0 auto 30px;
}

/* CARDS */
.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:20px;
  padding:10px 20px 80px;
}

.card{
  background:var(--surface);
  border:1px solid var(--border);
  padding:26px 24px;
  border-radius:12px;
  transition:transform .2s ease,border-color .2s ease;
}

.card:hover{
  transform:translateY(-4px);
  border-color:var(--accent);
}

.card h3{
  margin:0 0 8px;
  font-size:17px;
}

.card p{
  margin:0;
  font-size:14.5px;
  color:var(--text-muted);
}

/* PAGE HEADER (about / projects / contact) */
.page-header{
  padding:56px 20px 40px;
  text-align:center;
  border-bottom:1px solid var(--border);
}

.page-header h1{
  font-size:clamp(30px,4.5vw,44px);
  margin:0 0 12px;
  font-weight:700;
}

.page-header p{
  color:var(--text-muted);
  margin:0;
  font-size:16px;
}

.page-body{
  padding:50px 20px 80px;
  max-width:720px;
  margin:0 auto;
}

.page-body p{color:var(--text-muted);font-size:16px;}

/* PROJECT GRID */
.project-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:20px;
  padding:50px 20px 80px;
  max-width:1100px;
  margin:0 auto;
}

.project-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:12px;
  overflow:hidden;
  transition:transform .2s ease,border-color .2s ease;
}

.project-card:hover{transform:translateY(-4px);border-color:var(--accent);}

.project-thumb{
  height:150px;
  background:linear-gradient(135deg,var(--surface),var(--bg));
  border-bottom:1px solid var(--border);
}

.project-card .info{padding:20px 22px;}
.project-card h3{margin:0 0 6px;font-size:16.5px;}
.project-card p{margin:0;font-size:14px;color:var(--text-muted);}

/* CONTACT */
.contact-list{
  max-width:480px;
  margin:0 auto;
  padding:50px 20px 90px;
  display:flex;
  flex-direction:column;
  gap:14px;
}

.contact-list a{
  display:flex;
  justify-content:space-between;
  align-items:center;
  background:var(--surface);
  border:1px solid var(--border);
  padding:18px 22px;
  border-radius:10px;
  font-size:15px;
  transition:border-color .2s ease;
}

.contact-list a:hover{border-color:var(--accent);}

/* BOOK CLUB */
.book-list{
  max-width:720px;
  margin:0 auto;
  padding:50px 20px 90px;
  counter-reset:book;
}

.book-row{
  counter-increment:book;
  display:flex;
  align-items:baseline;
  gap:18px;
  padding:18px 0;
  border-bottom:1px solid var(--border);
}

.book-row::before{
  content:counter(book);
  font-size:14px;
  color:var(--accent);
  font-weight:600;
  width:22px;
  flex-shrink:0;
}

.book-row .book-info{flex:1;}

.book-row a.title{
  font-size:16px;
  font-weight:600;
  border-bottom:1px solid transparent;
}

.book-row a.title:hover{border-color:var(--accent);color:var(--accent);}

.book-row .author{
  display:block;
  font-size:14px;
  color:var(--text-muted);
  margin-top:2px;
}

/* FOOTER */
footer{
  text-align:center;
  padding:28px 20px;
  border-top:1px solid var(--border);
  color:var(--text-muted);
  font-size:13.5px;
}