/* =========================================================
   iHACKER — Diff Checker
   Red console theme · diff.css
   ========================================================= */

:root{
  --bg:#0B0B0D; --bg-2:#111013; --surface:#17161A; --surface-2:#1F1D22;
  --border:#2C2A30; --border-2:#413E46;
  --text:#F1F1F3; --text-dim:#A0A0A8; --text-mute:#6E6E78;
  --red:#DD0000; --red-bright:#FF2020; --red-deep:#A60000;
  --red-soft:rgba(221,0,0,.12); --red-line:rgba(221,0,0,.45); --red-glow:rgba(221,0,0,.30);
  --green:#22C55E; --amber:#F59E0B;

  /* diff colours */
  --del-row:rgba(221,0,0,.10);  --del-word:rgba(255,32,32,.38);  --del-text:#FFB3B3;
  --ins-row:rgba(34,197,94,.10); --ins-word:rgba(34,197,94,.38); --ins-text:#B6F5CB;

  --font-ui:'Space Grotesk',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',monospace;
}

*,*::before,*::after{ box-sizing:border-box; }
[hidden]{ display:none !important; }
html,body{ margin:0; }
body{
  min-height:100vh; font-family:var(--font-ui); color:var(--text);
  background-color:var(--bg);
  background-image:
    radial-gradient(1000px 520px at 50% -10%, var(--red-soft), transparent 68%),
    linear-gradient(var(--bg-2), var(--bg));
  background-attachment:fixed;
  display:flex; flex-direction:column; align-items:center; padding:0 0 40px;
  -webkit-font-smoothing:antialiased;
}

.breadcrumb{ width:95%; max-width:1280px; margin:16px auto 0; font-family:var(--font-mono); font-size:12px; color:var(--text-mute); display:flex; gap:8px; align-items:center; flex-wrap:wrap; }
.breadcrumb a{ color:var(--text-dim); text-decoration:none; font-weight:500; }
.breadcrumb a:hover{ color:var(--red-bright); }
.breadcrumb span[aria-current]{ color:var(--text); }

.main-container{ width:95%; max-width:1280px; }

.card{
  background:var(--surface); border:2px solid var(--border); border-radius:16px;
  box-shadow:0 10px 30px rgba(0,0,0,.4); padding:22px; margin:16px 0;
}
.head{ text-align:center; }
.head h1{ font-size:clamp(26px,5vw,36px); font-weight:700; color:var(--red); text-shadow:0 0 30px var(--red-glow); letter-spacing:-.5px; margin:0 0 4px; }
.sub{ color:var(--text-dim); font-size:14px; margin:0; }

/* ---------- toolbar ---------- */
.toolbar{ display:flex; flex-wrap:wrap; gap:10px 16px; align-items:center; justify-content:space-between; margin-bottom:16px; }
.seg{ display:inline-flex; background:var(--bg-2); border:2px solid var(--border); border-radius:12px; padding:4px; gap:4px; }
.seg button{
  font-family:var(--font-ui); font-weight:600; font-size:13.5px; color:var(--text-dim);
  background:transparent; border:0; border-radius:8px; padding:8px 14px; cursor:pointer;
  display:inline-flex; align-items:center; gap:7px; transition:background .15s,color .15s;
}
.seg button:hover{ color:var(--text); }
.seg button.active{ background:var(--red); color:#fff; box-shadow:0 4px 14px var(--red-glow); }
.seg-label{ font-family:var(--font-mono); font-size:11px; letter-spacing:.6px; text-transform:uppercase; color:var(--text-mute); margin-right:8px; }
.seg-wrap{ display:flex; align-items:center; flex-wrap:wrap; gap:6px; }

.opts{ display:flex; flex-wrap:wrap; gap:8px 18px; margin:0 0 16px; }
.chk{ display:inline-flex; align-items:center; gap:9px; cursor:pointer; user-select:none; font-size:13.5px; color:var(--text-dim); }
.chk.off{ opacity:.4; pointer-events:none; }
.chk input{ position:absolute; opacity:0; width:0; height:0; }
.box{ width:18px; height:18px; flex:0 0 auto; border:2px solid var(--border-2); border-radius:5px; background:var(--bg-2); display:grid; place-items:center; transition:border-color .15s; }
.box::after{ content:""; width:8px; height:8px; border-radius:2px; background:var(--red-bright); transform:scale(0); transition:transform .15s; }
.chk input:checked ~ .box{ border-color:var(--red); }
.chk input:checked ~ .box::after{ transform:scale(1); }
.chk input:focus-visible ~ .box{ box-shadow:0 0 0 3px var(--red-soft); }

/* ---------- input panes ---------- */
.panes{ display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:14px; }
@media (max-width:760px){ .panes{ grid-template-columns:1fr; } }
.pane{ display:flex; flex-direction:column; min-width:0; border-radius:14px; transition:box-shadow .15s; }
.pane.drop{ box-shadow:0 0 0 3px var(--red-line); }
.pane-h{ display:flex; align-items:center; gap:8px; margin-bottom:8px; min-width:0; }
.pane-h .tag{ font-family:var(--font-mono); font-size:11px; font-weight:700; letter-spacing:.6px; padding:3px 8px; border-radius:6px; }
.tag.a{ background:var(--del-row); color:var(--del-text); border:1px solid rgba(221,0,0,.35); }
.tag.b{ background:var(--ins-row); color:var(--ins-text); border:1px solid rgba(34,197,94,.35); }
.pane-h .name{ font-weight:600; font-size:14px; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; flex:1; }
.mini{
  font-family:var(--font-mono); font-size:12px; color:var(--text-dim); background:var(--surface-2);
  border:1px solid var(--border); border-radius:8px; padding:6px 10px; cursor:pointer;
  display:inline-flex; align-items:center; gap:6px; position:relative; overflow:hidden; white-space:nowrap;
}
.mini:hover{ border-color:var(--red); color:#fff; }
.mini input[type=file]{ position:absolute; inset:0; opacity:0; cursor:pointer; }
textarea.txt{
  width:100%; min-height:280px; resize:vertical; padding:12px 14px;
  font-family:var(--font-mono); font-size:13.5px; line-height:1.55; tab-size:4;
  color:var(--text); background:var(--bg-2); border:2px solid var(--border); border-radius:12px; outline:none;
  transition:border-color .15s, box-shadow .15s; white-space:pre; overflow-wrap:normal; overflow:auto;
}
textarea.txt:focus{ border-color:var(--red); box-shadow:0 0 0 4px var(--red-soft); }
textarea.txt::placeholder{ color:var(--text-mute); }
.meta{ font-family:var(--font-mono); font-size:11.5px; color:var(--text-mute); margin-top:6px; }

.actions{ display:flex; flex-wrap:wrap; gap:10px; margin-top:16px; }
.btn{ font-family:var(--font-ui); font-weight:600; font-size:14px; border-radius:11px; padding:12px 18px; cursor:pointer; border:2px solid transparent; transition:all .15s; display:inline-flex; align-items:center; gap:8px; }
.btn-primary{ background:var(--red); color:#fff; box-shadow:0 6px 18px var(--red-glow); }
.btn-primary:hover{ background:var(--red-bright); transform:translateY(-1px); }
.btn-ghost{ background:var(--surface-2); color:var(--text); border-color:var(--border); }
.btn-ghost:hover{ border-color:var(--red); color:#fff; }
.btn-ghost:disabled{ opacity:.4; cursor:not-allowed; border-color:var(--border); color:var(--text-dim); }
.kbd{ font-family:var(--font-mono); font-size:11px; color:var(--text-mute); align-self:center; }

/* ---------- results ---------- */
.res-head{ display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:12px; margin-bottom:12px; }
.stats{ display:flex; flex-wrap:wrap; gap:8px; }
.chip{ font-family:var(--font-mono); font-size:12.5px; background:var(--bg-2); border:1px solid var(--border); border-radius:999px; padding:6px 12px; color:var(--text-dim); }
.chip b{ color:var(--text); }
.chip.add b{ color:#4ADE80; } .chip.del b{ color:#FF6B6B; } .chip.mod b{ color:var(--amber); }
.chip.muted{ color:var(--text-mute); }
.nav{ display:flex; align-items:center; gap:8px; }
.nav .count{ font-family:var(--font-mono); font-size:12.5px; color:var(--text-dim); min-width:58px; text-align:center; }
.icon-btn{ width:38px; height:38px; display:grid; place-items:center; border-radius:10px; background:var(--surface-2); border:1px solid var(--border-2); color:var(--text-dim); cursor:pointer; }
.icon-btn:hover:not(:disabled){ border-color:var(--red); color:#fff; }
.icon-btn:disabled{ opacity:.35; cursor:not-allowed; }
.export{ display:flex; gap:8px; flex-wrap:wrap; }

.banner{ border-radius:12px; padding:12px 16px; margin-bottom:12px; font-size:14px; display:flex; align-items:center; gap:10px; }
.banner.same{ background:rgba(34,197,94,.10); border:1px solid rgba(34,197,94,.35); color:#86EFAC; }
.note{ font-family:var(--font-mono); font-size:12px; color:var(--amber); margin:0 0 10px; }

.output{ border:2px solid var(--border); border-radius:12px; overflow:hidden; background:var(--bg-2); }
.output:empty{ display:none; }

/* line views */
.dview{ font-family:var(--font-mono); font-size:13px; line-height:1.55; }
.srow{ display:grid; grid-template-columns:3.4em minmax(0,1fr) 3.4em minmax(0,1fr); }
.urow{ display:grid; grid-template-columns:3.4em 3.4em 1.6em minmax(0,1fr); }
.ln{ color:var(--text-mute); text-align:right; padding:1px 8px 1px 4px; user-select:none; font-size:12px; background:rgba(255,255,255,.015); border-right:1px solid var(--border); }
.srow .ln:nth-of-type(3){ border-left:1px solid var(--border); }
.lc{ padding:1px 10px; white-space:pre-wrap; overflow-wrap:anywhere; min-width:0; color:var(--text); }
.sg{ text-align:center; color:var(--text-mute); user-select:none; }
.lc.empty{ background:repeating-linear-gradient(135deg,transparent 0 6px,rgba(255,255,255,.025) 6px 12px); }
.lc.side-del{ background:var(--del-row); }
.lc.side-ins{ background:var(--ins-row); }
.urow.del{ background:var(--del-row); } .urow.del .sg{ color:#FF6B6B; }
.urow.ins{ background:var(--ins-row); } .urow.ins .sg{ color:#4ADE80; }
.dview del{ background:var(--del-word); color:var(--del-text); text-decoration:none; border-radius:3px; }
.dview ins{ background:var(--ins-word); color:var(--ins-text); text-decoration:none; border-radius:3px; }

.chg{ scroll-margin:120px; }
.chg.flash{ animation:flash 1.2s ease; }
@keyframes flash{ 0%{ box-shadow:inset 0 0 0 2px var(--red-bright); } 100%{ box-shadow:inset 0 0 0 2px transparent; } }

.fold{
  display:block; width:100%; text-align:left; font-family:var(--font-mono); font-size:12px;
  color:var(--text-dim); background:var(--surface-2); border:0; border-top:1px dashed var(--border-2); border-bottom:1px dashed var(--border-2);
  padding:6px 14px; cursor:pointer;
}
.fold span{ color:var(--text-mute); }
.fold:hover{ color:#fff; background:var(--surface); }
.fold i{ color:var(--red-bright); margin-right:4px; }

/* word / char views */
.tview{ display:grid; gap:0; }
.tview.split{ grid-template-columns:repeat(2,minmax(0,1fr)); }
.tview.split .tdoc + .tdoc{ border-left:1px solid var(--border); }
@media (max-width:760px){ .tview.split{ grid-template-columns:1fr; } .tview.split .tdoc + .tdoc{ border-left:0; border-top:1px solid var(--border); } }
.tdoc-h{ font-family:var(--font-mono); font-size:11px; letter-spacing:.6px; text-transform:uppercase; color:var(--text-mute); padding:8px 14px; border-bottom:1px solid var(--border); background:rgba(255,255,255,.015); }
.tdoc-b{ font-family:var(--font-mono); font-size:13px; line-height:1.65; padding:12px 14px; white-space:pre-wrap; overflow-wrap:anywhere; min-width:0; }
.tdoc-b del{ background:var(--del-word); color:var(--del-text); text-decoration:line-through; text-decoration-color:rgba(255,179,179,.6); border-radius:3px; }
.tdoc-b ins{ background:var(--ins-word); color:var(--ins-text); text-decoration:none; border-radius:3px; }
.tdoc-b .gap{ display:inline-block; width:2px; height:1.1em; vertical-align:middle; background:var(--red-line); }

.privacy{ font-size:12.5px; color:var(--text-mute); margin-top:12px; display:flex; align-items:center; gap:8px; }
.privacy i{ color:var(--green); }

.toast{ position:fixed; left:50%; bottom:24px; transform:translate(-50%,12px); opacity:0; z-index:999; background:var(--red); color:#fff; font-family:var(--font-mono); font-size:13px; padding:10px 18px; border-radius:999px; box-shadow:0 10px 24px rgba(0,0,0,.5); transition:opacity .2s, transform .2s; pointer-events:none; }
.toast.show{ opacity:1; transform:translate(-50%,0); }

/* ---------- about / SEO ---------- */
.about h2{ font-size:20px; font-weight:600; margin:0 0 12px; }
.about h3{ font-size:16px; font-weight:600; margin:20px 0 8px; }
.about p,.about li{ font-size:14px; line-height:1.7; color:var(--text-dim); }
.about strong{ color:var(--text); font-weight:600; }
.about ul,.about ol{ padding-left:20px; }
.about code{ font-family:var(--font-mono); font-size:12.5px; color:var(--red-bright); background:var(--bg-2); padding:2px 6px; border-radius:5px; }
.faq details{ border:2px solid var(--border); border-radius:12px; background:var(--surface-2); margin-bottom:10px; }
.faq summary{ cursor:pointer; padding:14px 42px 14px 16px; font-weight:600; font-size:14.5px; position:relative; list-style:none; }
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::after{ content:"+"; position:absolute; right:16px; top:50%; transform:translateY(-50%); color:var(--red-bright); font-family:var(--font-mono); font-size:20px; }
.faq details[open] summary::after{ content:"\2013"; }
.faq p{ padding:0 16px 16px; margin:0; font-size:13.5px; }

@media (max-width:600px){
  .card{ padding:16px; }
  .srow{ grid-template-columns:2.6em minmax(0,1fr) 2.6em minmax(0,1fr); }
  .urow{ grid-template-columns:2.6em 2.6em 1.3em minmax(0,1fr); }
  .dview, .tdoc-b{ font-size:12px; }
  .seg button{ padding:7px 10px; font-size:13px; }
}
@media (prefers-reduced-motion:reduce){ *{ transition:none!important; animation:none!important; } }