/* Edulin Games v13 — Space Scientist mission hub.
   Palette matches the authored module HTML so the hub and the missions feel like one book. */
:root{
  --space:#14153A;
  --space-2:#232567;
  --paper:#F1EFF8;
  --card:#FFFFFF;
  --ink:#1F2140;
  --ink-soft:#4B4D74;
  --gold:#F5B841;
  --cyan:#16B8BA;
  --green:#3FA34D;
  --line:#E1DEF0;
  --radius:20px;
  --shadow:0 10px 30px rgba(20,21,58,.10);
  --display:"Trebuchet MS","Segoe UI Rounded",ui-rounded,"Nunito",system-ui,sans-serif;
  --body:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.6;-webkit-text-size-adjust:100%;}
.loading{padding:60px 20px;text-align:center;color:var(--ink-soft);}

/* ── Top bar ── */
.topbar{
  position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  background:var(--space);color:#fff;padding:12px 18px;box-shadow:0 4px 18px rgba(20,21,58,.28);
}
.topbar .brand{display:flex;align-items:center;gap:9px;font-family:var(--display);font-weight:800;font-size:16px;letter-spacing:.01em;}
.topbar .brand .mark{color:var(--gold);font-size:19px;}
.topbar .spacer{flex:1;}
.bar-btn{
  font:inherit;font-family:var(--display);font-weight:700;font-size:14px;cursor:pointer;
  background:rgba(255,255,255,.10);border:1px solid rgba(245,184,65,.45);color:#fff;
  border-radius:999px;padding:8px 15px;
}
.bar-btn:hover{background:rgba(245,184,65,.22);}
.bar-btn.primary{background:var(--gold);border-color:var(--gold);color:#231f05;}
.who{font-size:13px;color:#CBC9EE;}
.who b{color:var(--gold);}

/* ── Hero ── */
header.hero{
  background:radial-gradient(120% 100% at 80% -10%, #2C2E7A 0%, var(--space) 55%);
  color:#fff;padding:34px 20px 40px;text-align:center;
}
header.hero .badge{
  display:inline-flex;align-items:center;gap:8px;background:rgba(245,184,65,.16);
  border:1px solid rgba(245,184,65,.5);color:var(--gold);font-family:var(--display);font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;font-size:12px;padding:7px 14px;border-radius:999px;
}
header.hero h1{font-family:var(--display);font-weight:800;font-size:clamp(26px,6vw,40px);line-height:1.1;margin:14px 0 8px;}
header.hero p{color:#CBC9EE;margin:0 auto;max-width:56ch;}
.progress-strip{
  margin:20px auto 0;max-width:520px;background:rgba(255,255,255,.10);
  border-radius:999px;height:12px;overflow:hidden;
}
.progress-strip i{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--gold));border-radius:999px;transition:width .35s ease;}
.progress-label{margin-top:9px;font-size:14px;color:#EDECFF;}

.wrap{max-width:960px;margin:0 auto;padding:0 18px 70px;}

/* ── Grade jump ── */
.grade-jump{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:26px 0 6px;}
.grade-jump h2{font-family:var(--display);font-size:17px;margin:0 8px 0 0;color:var(--space);}
.grade-btn{
  font:inherit;font-family:var(--display);font-weight:700;font-size:14px;cursor:pointer;
  background:#fff;border:2px solid var(--line);border-radius:999px;padding:9px 16px;color:var(--space);
}
.grade-btn:hover{border-color:var(--cyan);}
.grade-btn.active{background:var(--space);border-color:var(--space);color:#fff;}
.grade-btn small{display:block;font-weight:400;font-size:11px;opacity:.72;}
.jump-note{font-size:14px;color:var(--ink-soft);margin:4px 0 0;}

/* ── Mission list ── */
.mission-list{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:12px;}
.mission-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  display:flex;align-items:center;gap:14px;padding:14px 16px;width:100%;text-align:left;
  font:inherit;color:inherit;cursor:pointer;
}
.mission-card:hover{border-color:var(--cyan);transform:translateY(-1px);}
.mission-card .seq{
  flex:0 0 auto;width:42px;height:42px;border-radius:50%;background:var(--paper);color:var(--space);
  display:flex;align-items:center;justify-content:center;font-family:var(--display);font-weight:800;font-size:15px;
}
.mission-card.done .seq{background:var(--green);color:#fff;}
.mission-card.current{border-color:var(--gold);box-shadow:0 0 0 3px rgba(245,184,65,.28),var(--shadow);}
.mission-card .body{flex:1;min-width:0;}
.mission-card .mid{font-family:var(--display);font-weight:800;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--cyan);}
.mission-card h3{margin:2px 0 3px;font-family:var(--display);font-size:18px;color:var(--space);line-height:1.25;}
.mission-card p{margin:0;font-size:14px;color:var(--ink-soft);}
.mission-card .tick{flex:0 0 auto;font-size:19px;color:var(--green);}
.bonus-chip{display:inline-block;margin-left:8px;background:#FFF4D9;border:1px solid #F3E2B4;color:#8A6A12;border-radius:999px;padding:1px 9px;font-size:11px;font-weight:700;vertical-align:middle;}

/* ── Module reader ── */
.reader{display:none;}
.reader.active{display:block;}
.hub.hidden{display:none;}
.reader-bar{
  position:sticky;top:53px;z-index:30;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  background:rgba(241,239,248,.95);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);padding:10px 18px;
}
.reader-bar .title{font-family:var(--display);font-weight:800;color:var(--space);font-size:15px;flex:1;min-width:180px;}
.nav-btn{
  font:inherit;font-family:var(--display);font-weight:700;font-size:14px;cursor:pointer;
  background:#fff;border:2px solid var(--line);border-radius:999px;padding:8px 15px;color:var(--space);
}
.nav-btn:hover:not(:disabled){border-color:var(--cyan);}
.nav-btn:disabled{opacity:.42;cursor:default;}
.nav-btn.done-btn{background:var(--green);border-color:var(--green);color:#fff;}
.nav-btn.done-btn.is-done{background:#fff;border-color:var(--green);color:var(--green);}
#module-frame{display:block;width:100%;border:0;background:var(--paper);height:calc(100vh - 112px);}

@media (max-width:560px){
  .topbar{padding:10px 12px;}
  .wrap{padding:0 12px 56px;}
  .reader-bar{top:0;position:static;}
  #module-frame{height:calc(100vh - 150px);}
  .mission-card{padding:12px;}
}