/* =========================================================
   CRYPTOLAB — shared design tokens & components
   Palette   : ink #0B0F14, panel #121821, panel-2 #171F2A
               amber #E8A33D (primary/active bit), cyan #4FD1C5 (secondary),
               red #E8586B (xor), text #E7ECF2, muted #8A97A6
   Type      : "Space Grotesk" for display, "Inter" for body,
               "JetBrains Mono" for every bit / hex / table value
   ========================================================= */

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

:root{
  --ink:        #0B0F14;
  --panel:      #121821;
  --panel-2:    #171F2A;
  --panel-3:    #1D2733;
  --line:       #253141;
  --text:       #E7ECF2;
  --muted:      #8A97A6;
  --muted-2:    #5C6878;
  --amber:      #E8A33D;
  --amber-dim:  rgba(232,163,61,.14);
  --cyan:       #4FD1C5;
  --cyan-dim:   rgba(79,209,197,.14);
  --red:        #E8586B;
  --red-dim:    rgba(232,88,107,.14);
  --violet:     #9C8CF4;

  --f-display:  'Space Grotesk', sans-serif;
  --f-body:     'Inter', sans-serif;
  --f-mono:     'JetBrains Mono', monospace;

  --radius:     14px;
  --radius-sm:  8px;
  --shadow:     0 20px 60px -20px rgba(0,0,0,.6);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:var(--f-body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

/* ambient backdrop: faint drifting bit grid */
.bitfield{
  position:fixed; inset:0; z-index:0; pointer-events:none;
  opacity:.35;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(232,163,61,.06), transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(79,209,197,.06), transparent 40%);
}
.bitfield::before{
  content:'';
  position:absolute; inset:-10%;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:42px 42px;
  opacity:.25;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 40%, transparent 90%);
}

a{color:inherit;}
h1,h2,h3,h4{font-family:var(--f-display); margin:0; letter-spacing:-.01em;}
code, .mono{font-family:var(--f-mono);}

::selection{background:var(--amber); color:var(--ink);}

/* ---------- topbar ---------- */
.topbar{
  position:sticky; top:0; z-index:40;
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 32px;
  background:rgba(11,15,20,.78);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family:var(--f-display); font-weight:700; font-size:1.05rem;
  text-decoration:none;
}
.brand .mark{
  width:28px; height:28px; border-radius:7px;
  background:linear-gradient(135deg, var(--amber), var(--cyan));
  display:grid; place-items:center;
  font-family:var(--f-mono); font-weight:700; font-size:.7rem; color:var(--ink);
}
.brand small{display:block; font-family:var(--f-body); font-weight:500; font-size:.68rem; color:var(--muted); letter-spacing:.06em;}
.navlinks{display:flex; gap:6px; flex-wrap:wrap;}
.navlinks a{
  padding:8px 14px; border-radius:999px; font-size:.82rem; font-weight:500;
  text-decoration:none; color:var(--muted); border:1px solid transparent;
  transition:all .15s ease;
}
.navlinks a:hover{color:var(--text); border-color:var(--line); background:var(--panel);}
.navlinks a.active{color:var(--ink); background:var(--amber); }

main{position:relative; z-index:1;}

/* ---------- landing hero ---------- */
.hero{
  padding:96px 32px 64px;
  max-width:1180px; margin:0 auto;
  display:grid; grid-template-columns:1.15fr .85fr; gap:56px; align-items:center;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--f-mono); font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  color:var(--amber); background:var(--amber-dim); border:1px solid rgba(232,163,61,.3);
  padding:6px 12px; border-radius:999px; margin-bottom:22px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--amber); box-shadow:0 0 8px var(--amber);}
.hero h1{font-size:3.15rem; line-height:1.05; font-weight:700;}
.hero h1 .accent{
  background:linear-gradient(100deg, var(--amber), var(--cyan));
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero p.lede{margin-top:20px; font-size:1.08rem; color:var(--muted); max-width:52ch;}
.hero .cta-row{margin-top:32px; display:flex; gap:14px; flex-wrap:wrap;}

/* hero visual: animated cipher strip */
.cipher-strip{
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; box-shadow:var(--shadow); overflow:hidden;
}
.cipher-strip .row{display:flex; gap:6px; margin-bottom:8px; flex-wrap:wrap;}
.bit{
  width:26px; height:26px; border-radius:6px; display:grid; place-items:center;
  font-family:var(--f-mono); font-size:.78rem; font-weight:600;
  background:var(--panel-3); border:1px solid var(--line); color:var(--muted-2);
  transition:all .35s ease;
}
.bit.on{background:var(--amber-dim); border-color:var(--amber); color:var(--amber);}
.bit.alt{background:var(--cyan-dim); border-color:var(--cyan); color:var(--cyan);}
.cipher-strip .caption{margin-top:12px; font-family:var(--f-mono); font-size:.72rem; color:var(--muted-2);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 20px; border-radius:10px; font-weight:600; font-size:.88rem;
  text-decoration:none; border:1px solid transparent; cursor:pointer;
  font-family:var(--f-body);
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--amber); color:#1a1206;}
.btn-primary:hover{box-shadow:0 8px 24px -8px rgba(232,163,61,.55);}
.btn-ghost{background:var(--panel); border-color:var(--line); color:var(--text);}
.btn-ghost:hover{border-color:var(--cyan); color:var(--cyan);}
.btn-block{width:100%; justify-content:center;}
.btn-sm{padding:8px 14px; font-size:.8rem;}
.btn:disabled{opacity:.45; cursor:not-allowed;}

/* ---------- module cards (landing) ---------- */
.modules{max-width:1180px; margin:0 auto; padding:20px 32px 100px;}
.section-head{display:flex; align-items:baseline; justify-content:space-between; margin-bottom:28px; gap:16px; flex-wrap:wrap;}
.section-head h2{font-size:1.6rem;}
.section-head p{color:var(--muted); margin:0; font-size:.92rem;}

.grid-cards{display:grid; grid-template-columns:repeat(auto-fit,minmax(255px,1fr)); gap:18px;}
.card{
  position:relative;
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  padding:26px; text-decoration:none; color:var(--text); overflow:hidden;
  transition:border-color .2s ease, transform .2s ease;
}
.card:hover{transform:translateY(-4px); border-color:var(--accent, var(--amber));}
.card .tag{
  font-family:var(--f-mono); font-size:.68rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--accent, var(--amber)); margin-bottom:14px; display:block;
}
.card h3{font-size:1.35rem; margin-bottom:8px;}
.card p{color:var(--muted); font-size:.87rem; margin:0 0 18px;}
.card .specs{display:flex; gap:10px; flex-wrap:wrap; margin-bottom:18px;}
.spec{
  font-family:var(--f-mono); font-size:.7rem; color:var(--muted);
  background:var(--panel-3); border:1px solid var(--line); padding:4px 9px; border-radius:6px;
}
.card .go{font-family:var(--f-mono); font-size:.8rem; color:var(--accent, var(--amber)); display:flex; align-items:center; gap:6px;}
.card::after{
  content:''; position:absolute; right:-40px; top:-40px; width:140px; height:140px; border-radius:50%;
  background:var(--accent, var(--amber)); opacity:.06; filter:blur(10px);
}
.card[data-c="cyan"]{--accent:var(--cyan);}
.card[data-c="violet"]{--accent:var(--violet);}
.card[data-c="red"]{--accent:var(--red);}

.footer{
  border-top:1px solid var(--line); padding:26px 32px; text-align:center;
  color:var(--muted-2); font-size:.8rem;
}

/* ---------- module page layout ---------- */
.module-hero{
  padding:44px 32px 8px; max-width:1180px; margin:0 auto;
  display:flex; justify-content:space-between; align-items:flex-end; gap:20px; flex-wrap:wrap;
}
.module-hero h1{font-size:2.1rem;}
.module-hero p{color:var(--muted); max-width:60ch; margin-top:8px;}
.module-badge{
  font-family:var(--f-mono); font-size:.7rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--accent,var(--amber)); background:var(--panel); border:1px solid var(--line);
  padding:6px 12px; border-radius:999px;
}

.workbench{max-width:1180px; margin:0 auto; padding:24px 32px 100px; display:grid; grid-template-columns:380px 1fr; gap:22px; align-items:start;}
@media(max-width:960px){.workbench{grid-template-columns:1fr;} .hero{grid-template-columns:1fr;}}

.panel{
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px;
}
.panel h4{font-size:.72rem; letter-spacing:.1em; text-transform:uppercase; color:var(--muted); margin-bottom:16px;}

.field{margin-bottom:16px;}
.field label{display:block; font-size:.8rem; font-weight:500; color:var(--text); margin-bottom:6px;}
.field .hint{font-size:.72rem; color:var(--muted-2); margin-top:5px;}
input[type=text], select, textarea{
  width:100%; background:var(--panel-2); border:1px solid var(--line); color:var(--text);
  padding:11px 12px; border-radius:9px; font-family:var(--f-mono); font-size:.88rem;
  outline:none; transition:border-color .15s ease;
}
input[type=text]:focus, select:focus, textarea:focus{border-color:var(--amber);}
input.invalid{border-color:var(--red);}
.errmsg{color:var(--red); font-size:.75rem; margin-top:6px; display:none;}
.errmsg.show{display:block;}

.mode-toggle{display:flex; background:var(--panel-2); border:1px solid var(--line); border-radius:9px; padding:3px; gap:3px;}
.mode-toggle button{
  flex:1; background:transparent; border:none; color:var(--muted); padding:9px 0; border-radius:7px;
  font-family:var(--f-body); font-weight:600; font-size:.83rem; cursor:pointer; transition:all .15s ease;
}
.mode-toggle button.active{background:var(--amber); color:#1a1206;}

.actions-row{display:flex; gap:10px; margin-top:20px;}

/* result summary */
.result-panel{
  background:linear-gradient(155deg, var(--panel-2), var(--panel));
  border:1px solid var(--line); border-radius:var(--radius); padding:24px; margin-bottom:20px;
  display:none;
}
.result-panel.show{display:block; animation:fadein .35s ease;}
@keyframes fadein{from{opacity:0; transform:translateY(6px);} to{opacity:1; transform:translateY(0);}}
.result-panel .label{font-family:var(--f-mono); font-size:.7rem; letter-spacing:.1em; text-transform:uppercase; color:var(--muted);}
.result-panel .value{
  font-family:var(--f-mono); font-size:1.5rem; font-weight:600; color:var(--amber);
  word-break:break-all; margin:8px 0 4px;
}
.result-panel .subvalue{font-family:var(--f-mono); font-size:.85rem; color:var(--cyan); word-break:break-all;}
.subkeys{display:flex; flex-wrap:wrap; gap:8px; margin-top:14px;}
.subkey-chip{
  font-family:var(--f-mono); font-size:.74rem; background:var(--panel-3); border:1px solid var(--line);
  padding:6px 10px; border-radius:7px; color:var(--text);
}

/* bit / nibble / byte box grid */
.boxrow{display:flex; gap:6px; flex-wrap:wrap; margin:8px 0;}
.box{
  min-width:30px; height:30px; padding:0 6px; border-radius:6px; display:grid; place-items:center;
  font-family:var(--f-mono); font-size:.78rem; font-weight:600;
  background:var(--panel-3); border:1px solid var(--line); color:var(--text);
}
.box.g-amber{background:var(--amber-dim); border-color:var(--amber); color:var(--amber);}
.box.g-cyan{background:var(--cyan-dim); border-color:var(--cyan); color:var(--cyan);}
.box.g-red{background:var(--red-dim); border-color:var(--red); color:var(--red);}
.box.g-violet{background:rgba(156,140,244,.14); border-color:var(--violet); color:var(--violet);}
.box.wide{min-width:44px;}
.boxrow.gap-group .box{margin-right:2px;}

/* matrix (AES / S-AES state) */
.matrix{display:inline-grid; gap:4px; margin:8px 0;}
.matrix .cell{
  width:52px; height:52px; display:grid; place-items:center;
  font-family:var(--f-mono); font-weight:600; font-size:.85rem;
  background:var(--panel-3); border:1px solid var(--line); border-radius:8px; color:var(--text);
}

/* solution toggle + accordion */
.solution-toggle{
  margin:24px 0 14px; width:100%; text-align:left; cursor:pointer;
  background:var(--panel); border:1px solid var(--line); border-radius:12px;
  padding:16px 20px; display:flex; align-items:center; justify-content:space-between;
  color:var(--text); font-family:var(--f-display); font-weight:600; font-size:1rem;
}
.solution-toggle:hover{border-color:var(--amber);}
.solution-toggle .chev{transition:transform .2s ease; color:var(--muted);}
.solution-toggle.open .chev{transform:rotate(180deg); color:var(--amber);}

.solution-body{display:none;}
.solution-body.open{display:block; animation:fadein .3s ease;}

.accordion-item{border:1px solid var(--line); border-radius:12px; margin-bottom:10px; overflow:hidden; background:var(--panel);}
.accordion-head{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:14px 18px; cursor:pointer; user-select:none;
}
.accordion-head:hover{background:var(--panel-2);}
.accordion-head .title{display:flex; align-items:center; gap:10px; font-weight:600; font-size:.92rem;}
.step-index{
  font-family:var(--f-mono); font-size:.72rem; background:var(--panel-3); color:var(--amber);
  border:1px solid var(--line); padding:3px 8px; border-radius:6px; min-width:2.2em; text-align:center;
}
.accordion-head .chev{color:var(--muted-2); transition:transform .2s ease; font-size:.8rem;}
.accordion-item.open .chev{transform:rotate(180deg);}
.accordion-body{display:none; padding:2px 18px 18px;}
.accordion-item.open .accordion-body{display:block;}
.accordion-item.round{border-color:rgba(79,209,197,.25);}

.substep{margin-bottom:16px;}
.substep:last-child{margin-bottom:0;}
.substep .st-title{font-size:.78rem; font-weight:600; color:var(--cyan); margin-bottom:6px; letter-spacing:.02em;}
.substep .st-desc{font-size:.8rem; color:var(--muted); margin-bottom:6px;}

table.sbox{border-collapse:collapse; font-family:var(--f-mono); font-size:.72rem; margin:8px 0;}
table.sbox th, table.sbox td{
  border:1px solid var(--line); padding:5px 8px; text-align:center; color:var(--muted);
}
table.sbox th{background:var(--panel-2); color:var(--muted);}
table.sbox td.hit{background:var(--amber); color:#1a1206; font-weight:700;}
table.sbox td.rowhit, table.sbox td.colhit{background:var(--panel-3); color:var(--text);}

.note-callout{
  background:var(--cyan-dim); border:1px solid rgba(79,209,197,.35); color:var(--cyan);
  border-radius:9px; padding:10px 14px; font-size:.78rem; margin:10px 0;
}
.empty-state{
  text-align:center; padding:60px 20px; color:var(--muted-2);
}
.empty-state .glyph{font-family:var(--f-mono); font-size:2rem; color:var(--muted-2); margin-bottom:10px;}

.spacer{height:8px;}
hr.div{border:none; border-top:1px solid var(--line); margin:16px 0;}

/* ---------- falling bit rain (landing background) ---------- */
#bitRain{
  position:fixed; inset:0; z-index:0; pointer-events:none;
  opacity:.5;
}

/* ---------- "cara pakai" step section ---------- */
.steps-section{max-width:1180px; margin:0 auto; padding:20px 32px 110px;}
.steps-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:16px;}
.step-card{
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; position:relative; transition:border-color .2s ease, transform .2s ease;
}
.step-card:hover{transform:translateY(-3px); border-color:var(--amber);}
.step-card .step-eyebrow{
  font-family:var(--f-mono); font-size:.7rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--amber); margin-bottom:12px; display:block;
}
.step-card h4{font-family:var(--f-display); font-size:1.15rem; font-weight:600; margin-bottom:10px;}
.step-card p{color:var(--muted); font-size:.86rem; margin:0;}
.step-card::before{
  content:''; position:absolute; left:24px; right:24px; bottom:0; height:2px;
  background:linear-gradient(90deg, var(--amber), transparent);
  opacity:0; transition:opacity .2s ease;
}
.step-card:hover::before{opacity:1;}

@media (prefers-reduced-motion: reduce){
  *{animation:none !important; transition:none !important;}
  #bitRain{display:none;}
}