/* =========================================================
   UAS Kriptografi — Simulator DES / S-DES / AES / S-AES
   Tema: "Plugboard" — panel sirkuit gelap dengan aksen mint
   & dusty-rose, tipografi mono untuk data biner/hex.
   ========================================================= */

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

:root{
  --bg:            #10121b;
  --bg-alt:        #171a26;
  --surface:       #1c2032;
  --surface-2:     #232840;
  --line:          #2e3352;
  --text:          #eae7dc;
  --text-dim:      #9aa0c0;
  --mint:          #7fe0c8;
  --mint-dim:      #4e9c8c;
  --rose:          #e6a3ad;
  --rose-dim:      #a5717a;
  --amber:         #e8c07d;
  --red:           #e57373;
  --font-display:  'Space Grotesk', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;
  --radius:        10px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:
    radial-gradient(circle at 15% 0%, #1a1e35 0%, transparent 45%),
    radial-gradient(circle at 85% 10%, #1c1830 0%, transparent 40%),
    var(--bg);
  color:var(--text);
  font-family:var(--font-mono);
  line-height:1.55;
  min-height:100vh;
}

a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--font-display); margin:0 0 .4em; letter-spacing:.01em; }
p{ margin:0 0 1em; color:var(--text-dim); }

::selection{ background:var(--mint); color:#0b0d14; }

/* ---------- layout shells ---------- */
.wrap{ max-width:1100px; margin:0 auto; padding:0 24px; }
.site-header{
  border-bottom:1px solid var(--line);
  padding:18px 0;
  background:rgba(16,18,27,.85);
  backdrop-filter:blur(6px);
  position:sticky; top:0; z-index:50;
}
.site-header .wrap{ display:flex; align-items:center; justify-content:space-between; }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; font-size:1.05rem; }
.brand .dot{ width:10px; height:10px; border-radius:50%; background:var(--mint); box-shadow:0 0 12px var(--mint); }
.nav-links{ display:flex; gap:22px; font-size:.85rem; }
.nav-links a{ color:var(--text-dim); transition:color .15s; }
.nav-links a:hover, .nav-links a.active{ color:var(--mint); }

main{ padding:48px 0 80px; }
footer{ border-top:1px solid var(--line); padding:28px 0; color:var(--text-dim); font-size:.78rem; text-align:center; }

/* ---------- hero (landing) ---------- */
.hero{ padding:64px 0 40px; text-align:left; position:relative; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  color:var(--mint); border:1px solid var(--mint-dim); border-radius:999px;
  padding:5px 14px; margin-bottom:22px; background:rgba(127,224,200,.06);
}
.hero h1{
  font-size:clamp(2rem, 4.4vw, 3.2rem);
  font-weight:700; max-width:820px; color:#fff;
}
.hero h1 .accent{ color:var(--mint); }
.hero p.lead{ max-width:640px; font-size:1.02rem; color:var(--text-dim); }

/* module grid */
.module-grid{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:18px; margin-top:38px;
}
.module-card{
  background:linear-gradient(160deg, var(--surface) 0%, var(--bg-alt) 100%);
  border:1px solid var(--line); border-radius:var(--radius);
  padding:24px 22px; position:relative; overflow:hidden;
  transition:transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.module-card::before{
  content:''; position:absolute; inset:0; opacity:0; transition:opacity .18s;
  background:radial-gradient(circle at 100% 0%, rgba(127,224,200,.14), transparent 60%);
}
.module-card:hover{ transform:translateY(-4px); border-color:var(--mint-dim); box-shadow:0 12px 30px -14px rgba(0,0,0,.6); }
.module-card:hover::before{ opacity:1; }
.module-card .tag{
  font-size:.68rem; letter-spacing:.12em; text-transform:uppercase; color:var(--amber);
  display:block; margin-bottom:10px;
}
.module-card h3{ font-size:1.3rem; color:#fff; margin-bottom:8px; }
.module-card p{ font-size:.85rem; margin-bottom:18px; }
.module-card .bits{ font-size:.72rem; color:var(--text-dim); display:flex; gap:14px; margin-bottom:16px; }
.module-card .bits span b{ color:var(--rose); }
.btn-go{
  display:inline-flex; align-items:center; gap:6px; font-size:.8rem;
  color:var(--mint); border-bottom:1px solid var(--mint-dim); padding-bottom:2px;
}
.module-card:hover .btn-go{ border-color:var(--mint); }

.info-strip{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:16px; margin-top:56px; padding-top:36px; border-top:1px solid var(--line);
}
.info-strip .item b{ display:block; color:#fff; font-family:var(--font-display); font-size:1rem; margin-bottom:4px; }
.info-strip .item p{ font-size:.8rem; margin:0; }

/* ---------- module page ---------- */
.module-header{ margin-bottom:8px; }
.module-header .tag{ font-size:.72rem; letter-spacing:.12em; text-transform:uppercase; color:var(--amber); }
.module-header h1{ color:#fff; font-size:2rem; margin:6px 0 8px; }
.module-header p{ max-width:680px; }

.panel{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:26px; margin-top:26px;
}
.panel h2{ font-size:1.05rem; color:#fff; display:flex; align-items:center; gap:10px; }
.panel h2 .num{
  width:26px; height:26px; border-radius:7px; background:var(--surface-2);
  color:var(--mint); display:inline-flex; align-items:center; justify-content:center;
  font-size:.78rem; font-weight:700; border:1px solid var(--line);
}

.field-row{ display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-top:16px; }
@media (max-width:720px){ .field-row{ grid-template-columns:1fr; } }
.field label{ display:block; font-size:.78rem; color:var(--text-dim); margin-bottom:6px; text-transform:uppercase; letter-spacing:.06em; }
.field input[type=text]{
  width:100%; background:var(--bg-alt); border:1px solid var(--line); color:var(--text);
  font-family:var(--font-mono); font-size:.95rem; padding:11px 13px; border-radius:8px;
  letter-spacing:.04em; transition:border-color .15s;
}
.field input[type=text]:focus{ outline:none; border-color:var(--mint); }
.field .hint{ font-size:.7rem; color:var(--text-dim); margin-top:5px; }
.field .err{ font-size:.72rem; color:var(--red); margin-top:5px; min-height:1em; }

.seg{ display:inline-flex; border:1px solid var(--line); border-radius:8px; overflow:hidden; margin-top:16px; }
.seg button{
  background:var(--bg-alt); color:var(--text-dim); border:none; padding:10px 22px;
  font-family:var(--font-mono); font-size:.85rem; cursor:pointer; transition:.15s;
}
.seg button.active{ background:var(--mint); color:#0b0d14; font-weight:600; }

.action-row{ display:flex; gap:12px; margin-top:22px; flex-wrap:wrap; align-items:center; }
.btn{
  font-family:var(--font-mono); font-size:.85rem; font-weight:600; padding:11px 24px;
  border-radius:8px; cursor:pointer; border:1px solid transparent; transition:.15s;
}
.btn-primary{ background:var(--mint); color:#0b0d14; }
.btn-primary:hover{ background:#95ebd6; }
.btn-secondary{ background:transparent; color:var(--text-dim); border-color:var(--line); }
.btn-secondary:hover{ color:var(--text); border-color:var(--text-dim); }
.btn-ghost{ background:transparent; color:var(--rose); border-color:var(--rose-dim); }
.btn-ghost:hover{ background:rgba(230,163,173,.08); }

/* result box */
.result-box{
  margin-top:22px; padding:22px; border-radius:var(--radius);
  background:var(--bg-alt); border:1px solid var(--mint-dim); display:none;
}
.result-box.show{ display:block; }
.result-box .rlabel{ font-size:.72rem; letter-spacing:.1em; text-transform:uppercase; color:var(--mint); margin-bottom:12px; }
.bit-row{ display:flex; flex-wrap:wrap; gap:6px; }
.bit-cell{
  width:34px; height:34px; display:flex; align-items:center; justify-content:center;
  background:var(--surface-2); border:1px solid var(--line); border-radius:6px;
  font-size:.9rem; font-weight:600; color:var(--text);
}
.bit-cell.hex{ width:auto; min-width:34px; padding:0 8px; color:var(--rose); }
.result-hex{ font-size:1.4rem; color:#fff; letter-spacing:.06em; margin-top:6px; }

/* solution steps */
.solution-toggle{
  margin-top:26px; display:flex; align-items:center; gap:10px; cursor:pointer;
  color:var(--mint); font-size:.85rem; user-select:none;
}
.solution-toggle .chev{ transition:transform .2s; display:inline-block; }
.solution-toggle.open .chev{ transform:rotate(90deg); }
.steps{ display:none; margin-top:18px; }
.steps.open{ display:block; }

.step{
  border-left:2px solid var(--line); padding:4px 0 22px 22px; position:relative;
}
.step::before{
  content:attr(data-idx); position:absolute; left:-13px; top:0;
  width:24px; height:24px; border-radius:50%; background:var(--surface-2);
  border:1px solid var(--mint-dim); color:var(--mint); font-size:.68rem;
  display:flex; align-items:center; justify-content:center; font-weight:700;
}
.step:last-child{ border-left-color:transparent; }
.step h4{ font-size:.92rem; color:#fff; margin-bottom:4px; }
.step .desc{ font-size:.8rem; color:var(--text-dim); margin-bottom:10px; }
.step .data-block{
  background:var(--bg-alt); border:1px solid var(--line); border-radius:8px;
  padding:12px 14px; font-size:.82rem; overflow-x:auto;
}
.step table{ border-collapse:collapse; font-size:.8rem; margin:6px 0; }
.step table td, .step table th{ border:1px solid var(--line); padding:4px 9px; text-align:center; }
.step table th{ color:var(--mint); }
.step .kv{ display:flex; gap:8px; flex-wrap:wrap; margin:4px 0; }
.step .kv span{ background:var(--surface-2); border-radius:5px; padding:3px 8px; color:var(--text-dim); }
.step .kv span b{ color:var(--rose); }
.step .matrix{ display:inline-grid; gap:4px; margin:6px 8px 6px 0; vertical-align:top; }
.step .matrix div{
  width:38px; height:32px; background:var(--surface-2); border:1px solid var(--line);
  border-radius:5px; display:flex; align-items:center; justify-content:center; font-size:.78rem;
}
.step .subkey-list{ display:flex; flex-wrap:wrap; gap:8px; }
.step .subkey-list .sk{ background:var(--surface-2); border:1px solid var(--line); border-radius:6px; padding:5px 10px; font-size:.76rem; }
.step .subkey-list .sk b{ color:var(--amber); margin-right:6px; }

.badge{ display:inline-block; font-size:.68rem; padding:2px 8px; border-radius:999px; background:var(--surface-2); color:var(--text-dim); margin-left:8px; }
.badge.enc{ color:var(--mint); border:1px solid var(--mint-dim); }
.badge.dec{ color:var(--rose); border:1px solid var(--rose-dim); }

.back-link{ font-size:.82rem; color:var(--text-dim); display:inline-flex; align-items:center; gap:6px; margin-bottom:18px; }
.back-link:hover{ color:var(--mint); }

@media (max-width:600px){
  .hero{ padding:40px 0 24px; }
  .panel{ padding:18px; }
  .bit-cell{ width:28px; height:28px; font-size:.78rem; }
}