:root {
  --bg: #0a0e13;
  --panel: #11161d;
  --panel2: #161e27;
  --line: #223040;
  --txt: #d8e2ec;
  --dim: #6d7f92;
  --green: #37e6a0;
  --cyan: #3fc9ff;
  --amber: #ffb454;
  --red: #ff5c6c;
  --purple: #b58cff;
  --mono: "Cascadia Mono", Consolas, "JetBrains Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--mono);
  font-size: 14px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection { background: rgba(55, 230, 160, .25); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #2c3e54; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 18px; width: 100%; }

/* ---------- top bar ---------- */
header#topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
header#topbar .wrap {
  display: flex; align-items: center; gap: 22px;
  padding-top: 12px; padding-bottom: 12px;
}
.logo {
  font-weight: 800; font-size: 16px; letter-spacing: 1px;
  color: var(--green); text-decoration: none;
  text-shadow: 0 0 14px rgba(55, 230, 160, .45);
  white-space: nowrap;
}
.logo span { color: var(--dim); font-weight: 600; }
header nav { display: flex; gap: 4px; }
header nav a {
  color: var(--dim); text-decoration: none; font-size: 12px;
  letter-spacing: 1px; padding: 6px 12px; border-radius: 6px;
  border: 1px solid transparent;
}
header nav a:hover { color: var(--cyan); background: var(--panel2); }
.spacer { flex: 1; }

#authBox { display: flex; align-items: center; gap: 10px; }
.userchip {
  font-size: 12px; color: var(--cyan); letter-spacing: 1px;
  display: flex; align-items: center; gap: 8px;
}
.userchip .role { font-size: 9px; color: var(--purple); border: 1px solid var(--line); border-radius: 3px; padding: 1px 5px; }

/* ---------- buttons & forms ---------- */
.btn {
  background: var(--panel2); border: 1px solid var(--line);
  color: var(--txt); font-family: var(--mono); font-size: 12px;
  letter-spacing: 1px; padding: 9px 16px; border-radius: 6px;
  cursor: pointer; transition: all .12s ease; text-decoration: none;
  display: inline-block;
}
.btn:hover { border-color: var(--cyan); color: var(--cyan); }
.btn.primary {
  background: linear-gradient(135deg, rgba(55,230,160,.15), rgba(63,201,255,.15));
  border-color: rgba(55, 230, 160, .5); color: var(--green);
}
.btn.primary:hover { box-shadow: 0 0 16px rgba(55, 230, 160, .25); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

input, textarea, select {
  background: var(--bg); border: 1px solid var(--line);
  color: var(--txt); font-family: var(--mono); font-size: 13px;
  padding: 10px 12px; border-radius: 6px; width: 100%; outline: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--cyan); box-shadow: 0 0 0 1px rgba(63,201,255,.25);
}
textarea { resize: vertical; min-height: 110px; line-height: 1.6; }
label.f { display: block; font-size: 10px; letter-spacing: 1px; color: var(--dim); margin: 0 0 6px 2px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }

/* ---------- cards / pages ---------- */
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 18px;
}
.panel-title {
  font-size: 11px; color: var(--dim); letter-spacing: 2px;
  margin-bottom: 14px; font-weight: 700;
}

.topic {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 14px 16px; margin-bottom: 10px;
  text-decoration: none; color: var(--txt);
  transition: border-color .12s ease, transform .12s ease;
}
.topic:hover { border-color: var(--cyan); transform: translateX(2px); }
.topic .trow { display: flex; gap: 12px; align-items: flex-start; }
.topic .tmeta { flex-shrink: 0; }
.topic .tmeta .cat {
  font-size: 10px; letter-spacing: 1px; padding: 3px 8px;
  border-radius: 4px; border: 1px solid var(--line); color: var(--cyan);
  background: var(--panel2); white-space: nowrap;
}
.topic .ttitle { font-size: 15px; font-weight: 700; color: var(--txt); }
.topic .tsnip { font-size: 12px; color: var(--dim); margin-top: 5px; line-height: 1.5; overflow: hidden; }
.topic .tfoot {
  margin-top: 10px; font-size: 11px; color: var(--dim);
  display: flex; gap: 14px; flex-wrap: wrap;
}
.topic .tfoot b { color: var(--txt); font-weight: 600; }
.topic .tfoot .codechip { color: var(--purple); }

/* ---------- category filter / search ---------- */
.catbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.catbar a {
  font-size: 11px; letter-spacing: 1px; color: var(--dim);
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 20px;
  text-decoration: none;
}
.catbar a.active { color: var(--green); border-color: rgba(55,230,160,.5); background: rgba(55,230,160,.07); }
.catbar a:hover { color: var(--cyan); border-color: var(--cyan); }
.searchbar { display: flex; gap: 10px; margin-bottom: 14px; align-items: center; }
.searchbar input { flex: 1; }

/* ---------- topic view ---------- */
.post-head { margin-bottom: 16px; }
.post-head .cat {
  font-size: 10px; letter-spacing: 1px; color: var(--cyan);
  border: 1px solid var(--line); border-radius: 4px; padding: 3px 8px;
  display: inline-block; margin-bottom: 10px; background: var(--panel2);
}
.post-head h1 { font-size: 22px; line-height: 1.3; word-break: break-word; }
.post-byline { margin-top: 10px; font-size: 12px; color: var(--dim); }
.post-byline b { color: var(--green); }

.post-body { line-height: 1.75; white-space: pre-wrap; word-break: break-word; font-size: 14px; }

.reply {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 14px 16px; margin-bottom: 10px;
}
.reply .rhead {
  font-size: 11px; color: var(--dim); margin-bottom: 10px;
  display: flex; gap: 10px; align-items: center;
}
.reply .rhead b { color: var(--cyan); font-size: 12px; }
.reply .rbody { line-height: 1.7; white-space: pre-wrap; word-break: break-word; font-size: 13px; }

/* ---------- code blocks ---------- */
.codeblock {
  background: #0b1118; border: 1px solid var(--line);
  border-radius: 8px; margin: 14px 0; overflow: hidden;
}
.codeblock .cbar {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 12px; background: var(--panel2);
  border-bottom: 1px solid var(--line); font-size: 10px;
  color: var(--purple); letter-spacing: 1px;
}
.codeblock .cbar .spacer { flex: 1; }
.codeblock .copybtn {
  background: none; border: 1px solid var(--line); color: var(--dim);
  font-family: var(--mono); font-size: 10px; letter-spacing: 1px;
  padding: 3px 10px; border-radius: 4px; cursor: pointer;
}
.codeblock .copybtn:hover { color: var(--green); border-color: var(--green); }
.codeblock pre {
  padding: 14px; overflow-x: auto; font-size: 13px; line-height: 1.6;
  font-family: var(--mono); color: #c9d7e4;
}
.codeblock pre code { font-family: inherit; }
.tk-kw { color: var(--purple); }
.tk-str { color: var(--green); }
.tk-num { color: var(--amber); }
.tk-com { color: #4a5a6d; font-style: italic; }
.tk-fn { color: var(--cyan); }

/* ---------- empty state ---------- */
.empty {
  text-align: center; color: var(--dim); padding: 48px 0;
  font-size: 12px; letter-spacing: 1px; line-height: 1.8;
}

/* ---------- auth pages ---------- */
.auth-card { max-width: 400px; margin: 30px auto; }
.auth-err { color: var(--red); font-size: 12px; margin-top: 10px; }
.auth-switch { margin-top: 14px; font-size: 12px; color: var(--dim); text-align: center; }
.auth-switch a { color: var(--cyan); text-decoration: none; }

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: 20px; right: 20px; background: var(--panel2);
  border: 1px solid var(--green); color: var(--green); border-radius: 6px;
  padding: 12px 18px; font-size: 12px; letter-spacing: 1px; z-index: 200;
  opacity: 0; transform: translateY(10px); transition: all .2s ease;
  pointer-events: none; max-width: 340px;
}
.toast.show { opacity: 1; transform: none; }
.toast.warn { border-color: var(--amber); color: var(--amber); }

footer { padding: 30px 0 40px; }
.mini { font-size: 10px; color: var(--dim); letter-spacing: 1px; }
.mt16 { margin-top: 16px; }
.hint { font-size: 11px; color: var(--dim); margin-top: 8px; line-height: 1.6; }
.loading { color: var(--dim); padding: 30px 0; text-align: center; font-size: 12px; letter-spacing: 1px; }