:root{
  --card-bg: rgba(0,0,0,.16);
  --card-border: rgba(255,255,255,.18);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.72);
  --btn-bg: rgba(255,255,255,.12);
  --btn-hover: rgba(255,255,255,.20);
  --focus: rgba(255,255,255,.45);
  --radius: 18px;
}

*{ box-sizing:border-box; }
html, body{
  height:100%;
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

body{
  color: var(--text);
  min-height: 100svh;
  min-height: 100dvh;
  position: relative;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 24px;
}

/* ===== BACKGROUND ===== */
body::before{
  content:"";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1200px 600px at 50% 30%, rgba(0,0,0,.25), rgba(0,0,0,.72)),
    url("Book-cover.jpg") center / cover no-repeat;
  filter: blur(10px);
  transform: scale(1.06);
}

body::after{
  content:"";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url("Book-cover.jpg") center / contain no-repeat;
  opacity: 0.92;
}

/* ===== WRAPPER ===== */
.wrap{
  width: min(720px, 100%);
  position: relative;
  z-index: 1;
  transform: translateY(-60px);
}

/* ===== CARD ===== */
.card{
  position: relative;
  border-radius: var(--radius);
  padding: clamp(18px, 4vw, 28px);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  box-shadow: 0 18px 60px rgba(0,0,0,.45);
  text-shadow: 0 1px 2px rgba(0,0,0,.6);

  opacity: 0;
  transform: translateY(8px);
  animation: cardIn 900ms ease forwards;
}

.card::before{
  content:"";
  position:absolute;
  inset:0;
  border-radius: inherit;
  pointer-events:none;
  background: radial-gradient(
    140% 120% at 50% 25%,
    rgba(255,255,255,.06) 0%,
    rgba(0,0,0,0) 45%,
    rgba(0,0,0,.20) 100%
  );
}

.card::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius: inherit;
  pointer-events:none;
  background: linear-gradient(
    135deg,
    rgba(255,255,255,.28) 0%,
    rgba(255,255,255,.10) 18%,
    rgba(255,255,255,0) 55%
  );
  opacity: .35;
}

@keyframes cardIn{
  to{ opacity:1; transform: translateY(0); }
}

header{
  text-align:center;
  position: relative;
  z-index:1;
}

h1{
  font-size: clamp(28px, 5vw, 38px);
  line-height:1.05;
  margin:0 0 6px;
  letter-spacing:.2px;
}

.subtitle{
  margin: 0 0 14px;
  color: var(--muted);
  font-size: clamp(14px, 2.2vw, 16px);
}

/* ===== NAV ===== */
.nav{
  display:flex;
  justify-content:center;
  gap:10px;
  flex-wrap:wrap;
  margin: 12px 0 18px;
}

.nav a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:8px 12px;
  font-size:13px;
  border-radius:999px;
  text-decoration:none;
  color: var(--text);
  background: rgba(255,255,255,.10);
  border: 1px solid var(--card-border);
  transition: background .12s ease, transform .12s ease;
}

.nav a:hover{
  background: rgba(255,255,255,.20);
  transform: translateY(-1px);
}

.nav a[aria-current="page"]{
  background: rgba(255,255,255,.18);
  border-color: rgba(255,255,255,.28);
}

/* ===== BUTTONS / LINKS ===== */
.actions{
  display:flex;
  gap:10px;
  justify-content:center;
  flex-wrap:wrap;
  margin: 10px 0 18px;
  position: relative;
  z-index: 1;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 14px;
  font-size:14px;
  border-radius:12px;
  text-decoration:none;
  color: var(--text);
  background: var(--btn-bg);
  border: 1px solid var(--card-border);
  transition: background .12s ease, transform .12s ease;
}

.btn:hover{
  background: var(--btn-hover);
  transform: translateY(-1px);
}

.btn.primary{
  background: rgba(255,255,255,.18);
  border-color: rgba(255,255,255,.30);
}

.social-inline{
  display:flex;
  gap:8px;
  justify-content:center;
  flex-wrap:wrap;
  margin-top: 8px;
  position: relative;
  z-index: 1;
}

.social-inline a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 10px;
  font-size:13px;
  border-radius:999px;
  text-decoration:none;
  color: var(--text);
  background: rgba(255,255,255,.10);
  border: 1px solid var(--card-border);
  transition: background .12s ease, transform .12s ease;
}

.social-inline a:hover{
  background: rgba(255,255,255,.20);
  transform: translateY(-1px);
}

/* ===== CONTENT ===== */
.content{
  position: relative;
  z-index: 1;
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
  text-align: center;
}

.hr{
  height:1px;
  background: rgba(255,255,255,.14);
  border:0;
  margin: 18px 0;
}

/* ===== CONTACT FORM ===== */
.form{
  width: min(520px, 100%);
  margin: 0 auto;
  text-align: left;
  position: relative;
  z-index: 1;
}

.field{
  display:flex;
  flex-direction:column;
  gap:6px;
  margin: 12px 0;
}

label{
  font-size: 13px;
  color: var(--muted);
}

input, textarea{
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(0,0,0,.18);
  color: var(--text);
  outline: none;
}

input:focus, textarea:focus{
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(255,255,255,.10);
}

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

.form-actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  justify-content:center;
  margin-top: 14px;
}

.helper{
  margin-top: 10px;
  font-size: 12px;
  color: rgba(255,255,255,.65);
  text-align: center;
}

/* ===== FOOTER ===== */
footer{
  margin-top: 18px;
  text-align:center;
  color: var(--muted);
  font-size: 12px;
  position: relative;
  z-index:1;
}

/* Mobile */
@media (max-width: 520px){
  body::after{ opacity: 0.95; }
  .wrap{ transform: translateY(-30px); }
}

@media (prefers-reduced-motion: reduce){
  .card{ animation:none; opacity:1; transform:none; }
}