@import url('https://cdnjs.cloudflare.com/ajax/libs/ibm-plex/6.4.0/css/ibm-plex-mono.min.css');
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600;700&display=swap');

/* ---------- LIGHT THEME (varsayılan) ---------- */
:root{
  --bg: #f5f7f9;
  --panel: #ffffff;
  --panel-2: #eef1f5;
  --border: #dde3e9;
  --border-soft: #e8ecf0;
  --text: #1a222c;
  --text-dim: #5b6672;
  --text-faint: #93a0ac;
  --amber: #b1600e;
  --cyan: #0d7f91;
  --green: #227a52;
  --red: #c1452f;
  --code-bg: #eef1f5;
  --code-border: #dde3e9;
  --final-bg: #fdf3e6;
  --final-border: #e9cda0;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Sans', sans-serif;
  --radius: 3px;
}

/* ---------- DARK THEME ---------- */
[data-theme="dark"]{
  --bg: #0a0d11;
  --panel: #12171d;
  --panel-2: #171d24;
  --border: #232b34;
  --border-soft: #1a2129;
  --text: #dbe2e8;
  --text-dim: #8b98a5;
  --text-faint: #566270;
  --amber: #ffb454;
  --cyan: #57c7d4;
  --green: #6fcf97;
  --red: #e8735f;
  --code-bg: #0d1117;
  --code-border: #232b34;
  --final-bg: #171008;
  --final-border: #3a2a12;
}

*{ box-sizing: border-box; }

/* Fare ile tıklamada varsayılan tarayıcı focus çerçevesini kaldır,
   klavye ile gezinmede (Tab tuşu) erişilebilirlik için ince bir halka bırak. */
button, .opt-card, .choice-card{ outline: none; }
button:focus-visible, .opt-card:focus-visible, .choice-card:focus-visible, input:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
html,body{ margin:0; padding:0; }
body{
  background:
    radial-gradient(circle at 15% 0%, rgba(87,199,212,.05), transparent 45%),
    radial-gradient(circle at 85% 100%, rgba(255,180,84,.04), transparent 45%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
  line-height: 1.5;
  transition: background-color .2s ease, color .2s ease;
}
body, .flow-block, .opt-card, .choice-card, .pn-strip, .summary-box, .btn, .decoder-input-row input, .output-pre, .vis-card{
  transition: background-color .2s ease, border-color .2s ease, color .2s ease;
}

.theme-toggle{
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text-dim);
  font-family: var(--mono); font-size: 11.5px; padding: 7px 12px; border-radius: var(--radius);
  cursor: pointer; display:flex; align-items:center; gap:6px; white-space:nowrap;
}
.theme-toggle:hover{ border-color: var(--cyan); color: var(--cyan); }

::selection{ background: var(--amber); color: #1a1206; }

/* ---------- Layout shell ---------- */
.app{ max-width: 1180px; margin: 0 auto; padding: 28px 20px 80px; }

.masthead{
  display:flex; align-items:baseline; justify-content:space-between;
  border-bottom: 1px solid var(--border); padding-bottom: 18px; margin-bottom: 22px;
  flex-wrap: wrap; gap: 10px;
}
.masthead .title{
  font-family: var(--mono); font-size: 20px; font-weight: 600; letter-spacing: .5px;
  color: var(--text);
}
.masthead .title span{ color: var(--amber); }
.masthead .subtitle{ font-size: 12px; color: var(--text-faint); font-family: var(--mono); }

/* ---------- Tabs ---------- */
.tabs{ display:flex; gap: 2px; margin-bottom: 24px; border-bottom: 1px solid var(--border); flex-wrap:wrap; }
.tab-btn{
  background: transparent; border: none; color: var(--text-dim);
  font-family: var(--mono); font-size: 12.5px; letter-spacing:.3px;
  padding: 11px 16px; cursor: pointer; border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.tab-btn:hover{ color: var(--text); }
.tab-btn.active{ color: var(--amber); border-bottom-color: var(--amber); }

.view{ display:none; animation: fadein .2s ease; }
.view.active{ display:block; }
@keyframes fadein{ from{ opacity:0; transform:translateY(4px);} to{opacity:1; transform:none;} }

/* ---------- Home cards ---------- */
.home-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 8px;}
@media (max-width:820px){ .home-grid{ grid-template-columns: 1fr; } }
.opt-card{
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 20px; cursor: pointer; text-align:left;
  transition: border-color .15s, transform .15s, background .15s;
  position: relative; overflow:hidden;
}
.opt-card::before{
  content:""; position:absolute; left:0; top:0; bottom:0; width:3px; background: var(--border);
  transition: background .15s;
}
.opt-card:hover{ border-color: var(--cyan); transform: translateY(-2px); background: var(--panel-2); }
.opt-card:hover::before{ background: var(--cyan); }
.opt-card .num{ font-family: var(--mono); color: var(--text-faint); font-size: 12px; }
.opt-card h3{ margin: 6px 0 8px; font-size: 16px; color: var(--text); }
.opt-card p{ margin:0; font-size: 13px; color: var(--text-dim); }

/* ---------- Part number strip (signature element) ---------- */
.pn-strip{
  font-family: var(--mono); font-size: 15px; background: var(--panel);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; display:flex; flex-wrap:wrap; gap: 6px; align-items:center;
  margin-bottom: 22px; letter-spacing: .5px;
}
.pn-strip .prefix{ color: var(--text-faint); }
.pn-seg{
  padding: 3px 7px; border-radius: 2px; color: var(--text-faint);
  border: 1px solid transparent;
}
.pn-seg.filled{ color: var(--text); }
.pn-seg.current{ background: rgba(255,180,84,.12); border-color: var(--amber); color: var(--amber); font-weight:600; }
.pn-seg.done{ color: var(--cyan); }

/* ---------- Step wizard ---------- */
.step-head{ display:flex; justify-content:space-between; align-items:baseline; margin-bottom: 14px; flex-wrap:wrap; gap:8px;}
.step-head h2{ font-size: 15px; margin:0; color: var(--text); text-transform: uppercase; letter-spacing:.6px;}
.step-head .step-counter{ font-family: var(--mono); font-size: 12px; color: var(--text-faint);}
.step-help{ font-size: 13px; color: var(--text-dim); margin-bottom: 18px; }

.choice-grid{ display:grid; grid-template-columns: repeat(auto-fill, minmax(210px,1fr)); gap: 10px; }
.choice-card{
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 13px 14px; cursor:pointer; transition: all .12s;
}
.choice-card:hover{ border-color: var(--cyan); }
.choice-card.selected{ border-color: var(--amber); background: rgba(255,180,84,.06); }
.choice-card .code{ font-family: var(--mono); font-weight:600; color: var(--amber); font-size: 13px; }
.choice-card.selected .code{ color: var(--amber); }
.choice-card .desc{ font-size: 12.5px; color: var(--text-dim); margin-top: 4px; }
.choice-card .meta{ font-size: 11px; color: var(--text-faint); margin-top:6px; font-family: var(--mono);}

.grid-2{ display:grid; grid-template-columns: 1fr 1fr; gap:10px;}
@media (max-width:640px){ .grid-2{ grid-template-columns: 1fr; } }

.nav-row{ display:flex; justify-content:space-between; margin-top: 26px; gap: 10px; }
.btn{
  font-family: var(--mono); font-size: 12.5px; letter-spacing:.3px;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  padding: 10px 18px; border-radius: var(--radius); cursor:pointer; transition: all .12s;
}
.btn:hover{ border-color: var(--cyan); color:var(--cyan); }
.btn.primary{ background: var(--amber); color:#1a1206; border-color: var(--amber); font-weight:600;}
.btn.primary:hover{ filter:brightness(1.08); color:#1a1206; }
.btn:disabled{ opacity:.35; cursor:not-allowed; }
.btn.ghost{ background:transparent; }

/* ---------- Summary ---------- */
.summary-box{ background: var(--panel); border:1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.summary-box h3{ margin-top:0; font-size:13px; text-transform:uppercase; letter-spacing:.6px; color: var(--text-dim);}
.summary-table{ width:100%; border-collapse: collapse; font-size: 13px; }
.summary-table td{ padding: 7px 4px; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
.summary-table td:first-child{ color: var(--text-faint); width: 42%; }
.summary-table td:last-child{ color: var(--text); font-family: var(--mono); }

.final-code{
  font-family: var(--mono); font-size: 22px; font-weight:700; color: var(--amber);
  background: var(--final-bg); border:1px solid var(--final-border); border-radius: var(--radius);
  padding: 16px 18px; margin: 14px 0; letter-spacing: 1px; word-break: break-all;
}
.final-code .lbl{ display:block; font-family: var(--sans); font-size:11px; font-weight:500; color: var(--text-faint); text-transform:uppercase; letter-spacing:.5px; margin-bottom:6px;}

.tag{ display:inline-block; font-family: var(--mono); font-size:11px; padding:2px 7px; border-radius:2px; border:1px solid var(--border); color: var(--text-dim); margin-right:6px;}
.tag.plug{ color: var(--green); border-color: rgba(111,207,151,.4); }
.tag.recept{ color: var(--cyan); border-color: rgba(87,199,212,.4); }

/* ---------- Decoder ---------- */
.decoder-input-row{ display:flex; gap:10px; margin-bottom: 20px; flex-wrap:wrap; }
.decoder-input-row input{
  flex:1; min-width:260px; background: var(--panel); border:1px solid var(--border); color: var(--text);
  font-family: var(--mono); font-size: 15px; padding: 12px 14px; border-radius: var(--radius);
}
.decoder-input-row input:focus{ outline:none; border-color: var(--amber); }

.error-box{ color: var(--red); font-size: 13px; font-family: var(--mono); padding: 12px; border:1px solid rgba(232,115,95,.35); background: rgba(232,115,95,.06); border-radius: var(--radius);}

.section-label{ font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing:.6px; color: var(--text-faint); margin: 22px 0 8px; }

footer.note{ margin-top: 40px; font-size: 11.5px; color: var(--text-faint); border-top:1px solid var(--border); padding-top:14px; }

/* ---------- Single-page wizard blocks ---------- */
.wiz-topbar{ margin-bottom: 18px; }

.flow-block{
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 22px 26px; margin-bottom: 22px; background: var(--panel);
}
.flow-block .flow-title{
  font-family: var(--mono); font-size: 13px; color: var(--amber); text-transform: uppercase;
  letter-spacing: .8px; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px solid var(--border);
}

.wiz-section{ margin-bottom: 22px; }
.wiz-section:last-child{ margin-bottom: 0; }
.wiz-section-head{ display:flex; align-items:baseline; gap: 9px; margin-bottom: 10px; flex-wrap:wrap; }
.wiz-section-head .wiz-num{
  font-family: var(--mono); font-size: 11px; color: var(--bg); background: var(--cyan);
  border-radius: 2px; padding: 1px 6px; font-weight: 700;
}
.wiz-section.locked .wiz-section-head .wiz-num{ background: var(--text-faint); }
.wiz-section-head h3{ margin:0; font-size: 13px; color: var(--text); text-transform: uppercase; letter-spacing: .5px; }
.wiz-section.locked .wiz-section-head h3{ color: var(--text-faint); }
.wiz-section-head .wiz-sub{ font-size: 11.5px; color: var(--text-faint); }

.locked-msg{
  font-size: 12.5px; color: var(--text-faint); border: 1px dashed var(--border-soft);
  border-radius: var(--radius); padding: 13px 14px; font-style: italic;
}

.output-block .output-pre{
  white-space: pre-wrap; word-break: break-word; font-family: var(--mono); font-size: 13px;
  background: var(--code-bg); border: 1px solid var(--code-border); border-radius: var(--radius);
  padding: 16px 18px; color: var(--text); margin: 0; line-height: 1.7;
}

/* ---------- Visual summary cards ---------- */
.vis-summary{ display:flex; flex-direction:column; gap: 10px; margin-bottom: 20px; }
.vis-card{
  display:flex; align-items:center; gap: 16px; flex-wrap: wrap;
  background: var(--code-bg); border: 1px solid var(--border); border-left: 4px solid var(--border);
  border-radius: var(--radius); padding: 13px 16px;
}
.vis-card.amber{ border-left-color: var(--amber); }
.vis-card.cyan{ border-left-color: var(--cyan); }
.vis-card.green{ border-left-color: var(--green); }
.vis-card .vis-label{
  font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: .6px;
  color: var(--text-faint); min-width: 80px; flex-shrink: 0;
}
.vis-card .vis-codes{ display:flex; flex-direction:column; gap:4px; flex: 1 1 auto; min-width: 200px; }
.vis-card .vis-code-row{ font-family: var(--mono); font-size: 15px; font-weight: 700; color: var(--text); }
.vis-card .vis-mini-tag{
  font-family: var(--mono); font-size: 10px; font-weight: 600; color: var(--bg); background: var(--text-faint);
  border-radius: 2px; padding: 1px 5px; margin-right: 7px; vertical-align: middle;
}
.vis-card .vis-note{ font-size: 12px; color: var(--text-dim); font-style: italic; margin-left: auto; text-align: right; }

/* ---------- Print ---------- */
@media print{
  body{ background: #fff; color: #000; }
  .tabs, .wiz-topbar, .btn, footer.note{ display: none !important; }
  .flow-block{ display: none !important; }
  .flow-block.output-block{ display: block !important; border: 1px solid #999; background: #fff; }
  .flow-block.output-block .flow-title{ color: #000; }
  .output-pre{ background: #f5f5f5; color: #000; border: 1px solid #999; }
  .vis-card{ background: #fff; border: 1px solid #999; color: #000; }
  .vis-card .vis-code-row, .vis-card .vis-label, .vis-card .vis-note{ color: #000 !important; }
}