/* styles.css — aligned with prototype hub visual language
 * dark deep bg + dot grid · cyan/magenta accents · SF Mono kickers · gradient titles
 */

:root {
  --bg:          #05070C;
  --bg-elev:     #0B0F18;
  --surface:     #111722;
  --surface-2:   #161D2B;
  --line:        rgba(208, 225, 255, 0.08);
  --line-hi:     rgba(208, 225, 255, 0.18);
  --line-accent: rgba(124, 240, 255, 0.35);

  --text:        #EEF6FF;
  --label:       #B9C6DE;
  --muted:       #9AA8BA;
  --dim:         #667386;

  --cyan:        #7CF0FF;
  --cyan-soft:   rgba(124, 240, 255, 0.10);
  --magenta:     #FF3D73;
  --magenta-soft:rgba(255, 61, 115, 0.10);
  --amber:       #F4B640;
  --emerald:     #34D399;
  --violet:      #A855F7;
  --red:         #F87171;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.65 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* dot-grid backdrop ---------------------------------------------------- */
body::before {
  content: "";
  position: fixed; inset: 0;
  background-image:
    radial-gradient(rgba(208, 225, 255, 0.04) 1px, transparent 1px);
  background-size: 22px 22px;
  background-position: 0 0;
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(60vw 50vh at 12% -10%, rgba(124, 240, 255, 0.08), transparent 60%),
    radial-gradient(60vw 50vh at 92% 8%,  rgba(255, 61, 115, 0.06), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

/* layout containers above the backdrop --------------------------------- */
header, .banner, main, footer { position: relative; z-index: 1; }

code, pre, .mono { font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace; }

/* topbar --------------------------------------------------------------- */
#topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 15, 24, 0.92), rgba(11, 15, 24, 0.78));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: sticky; top: 0;
}
.brand {
  display: flex; align-items: baseline; gap: 10px;
  font-weight: 600; font-size: 16px; letter-spacing: 0.2px;
}
.brand::before {
  content: "壹";
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 7px;
  background: linear-gradient(135deg, var(--magenta), var(--cyan));
  color: #04080F; font-weight: 700; font-size: 14px;
  align-self: center;
}
.brand .ver {
  color: var(--muted); margin-left: 4px;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.5px; text-transform: uppercase;
  padding: 2px 8px; border: 1px solid var(--line); border-radius: 999px;
}

#tabs { display: flex; gap: 6px; }
.tab {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 7px 16px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  letter-spacing: 0.1px;
  transition: color .15s, border-color .15s, background .15s, transform .1s;
}
.tab:hover { color: var(--text); border-color: var(--line-hi); }
.tab.active {
  color: var(--bg);
  background: linear-gradient(135deg, var(--cyan), #B7F8FF);
  border-color: transparent;
  font-weight: 600;
}

/* alignment banner ----------------------------------------------------- */
.banner {
  padding: 9px 28px;
  font-size: 12.5px;
  border-bottom: 1px solid var(--line);
  font-family: "SF Mono", ui-monospace, monospace;
  letter-spacing: 0.1px;
  display: flex; align-items: center; gap: 8px;
}
.banner-loading { background: var(--surface); color: var(--muted); }
.banner-ok      { background: rgba(52, 211, 153, 0.06); color: var(--emerald); border-bottom-color: rgba(52, 211, 153, 0.18); }
.banner-warn    { background: rgba(244, 182, 64, 0.07); color: var(--amber);   border-bottom-color: rgba(244, 182, 64, 0.22); }
.banner-error   { background: rgba(248, 113, 113, 0.07); color: var(--red);     border-bottom-color: rgba(248, 113, 113, 0.22); }

/* layout --------------------------------------------------------------- */
#layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: calc(100vh - 110px);
}

/* sidebar -------------------------------------------------------------- */
#sidebar {
  border-right: 1px solid var(--line);
  padding: 22px 14px 40px;
  overflow-y: auto;
  max-height: calc(100vh - 110px);
  background: linear-gradient(180deg, rgba(17, 23, 34, 0.45), rgba(17, 23, 34, 0));
  position: sticky; top: 110px;
}
#sidebar::-webkit-scrollbar { width: 6px; }
#sidebar::-webkit-scrollbar-thumb { background: var(--line-hi); border-radius: 3px; }

.sb-title {
  color: var(--cyan);
  text-transform: uppercase;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 1.2px;
  padding: 4px 14px 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 6px;
}

.sb-group { margin-top: 10px; }
.sb-group-title {
  color: var(--label);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 10.5px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 14px 14px 6px;
  font-weight: 600;
  display: flex; align-items: center; gap: 8px;
}
.sb-group-title::before {
  content: "";
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.8;
}

.sb-list { list-style: none; padding: 0; margin: 0 0 4px; }
.sb-list li a {
  display: block;
  padding: 7px 14px;
  color: var(--label);
  text-decoration: none;
  border-radius: 6px;
  font-size: 13px;
  border-left: 2px solid transparent;
  margin: 1px 4px;
  transition: color .12s, background .12s, border-color .12s, padding-left .12s;
}
.sb-list li a:hover {
  background: var(--cyan-soft);
  color: var(--text);
  border-left-color: var(--cyan);
}
.sb-list li a.active {
  color: var(--cyan);
  background: var(--cyan-soft);
  border-left-color: var(--cyan);
  font-weight: 600;
}

/* content -------------------------------------------------------------- */
#content {
  padding: 32px 44px 80px;
  max-width: 980px;
  overflow-x: auto;
}
.placeholder { color: var(--muted); padding: 30px; font-family: "SF Mono", ui-monospace, monospace; font-size: 12px; }

.welcome {
  padding: 16px 0;
}
.welcome-kicker {
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 10px; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 10px;
}
.welcome h2 {
  margin: 0 0 12px;
  font-size: 28px;
  background: linear-gradient(135deg, var(--text) 0%, var(--cyan) 60%, var(--magenta) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.welcome p { color: var(--label); max-width: 640px; }
.welcome-tip {
  margin-top: 22px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: 8px;
  background: var(--cyan-soft);
  color: var(--label);
  font-size: 13px;
  max-width: 640px;
}

.error {
  color: var(--red);
  padding: 16px 18px;
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: 8px;
  background: rgba(248, 113, 113, 0.05);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.6;
}

/* PRD content ---------------------------------------------------------- */
.prd-content { color: var(--label); }
.prd-content h1 {
  font-size: 30px;
  margin: 0 0 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, var(--text), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.prd-content h2 {
  margin: 38px 0 14px;
  font-size: 22px;
  color: var(--text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 130px;
}
.prd-content h2::before {
  content: "section ";
  color: var(--cyan);
  font-family: "SF Mono", ui-monospace, monospace;
  font-weight: 400;
  font-size: 18px;
  margin-right: 4px;
}
.prd-content h3 {
  margin: 24px 0 8px;
  font-size: 16px;
  color: var(--text);
}
.prd-content h4 {
  margin: 16px 0 6px;
  font-size: 14px;
  color: var(--cyan);
  font-family: "SF Mono", ui-monospace, monospace;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.prd-content p { margin: 10px 0; }
.prd-content code {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1px 7px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--cyan);
}
.prd-content pre {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.55;
}
.prd-content pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--text);
}
.prd-content table {
  border-collapse: collapse;
  margin: 14px 0;
  width: 100%;
  font-size: 13px;
}
.prd-content th, .prd-content td {
  border: 1px solid var(--line);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.prd-content th {
  background: var(--surface);
  color: var(--text);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.prd-content tr:nth-child(even) td { background: rgba(17, 23, 34, 0.4); }
.prd-content blockquote {
  border-left: 3px solid var(--magenta);
  padding: 8px 14px;
  color: var(--label);
  margin: 14px 0;
  background: var(--magenta-soft);
  border-radius: 0 8px 8px 0;
}
.prd-content ul, .prd-content ol { padding-left: 22px; }
.prd-content li { margin: 4px 0; }
.prd-content a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dotted var(--line-accent);
}
.prd-content a:hover { border-bottom-style: solid; color: #B7F8FF; }
.prd-content hr { border: none; border-top: 1px dashed var(--line); margin: 28px 0; }

/* Flow content --------------------------------------------------------- */
.flow-content {}

.flow-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.flow-id-chip {
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 4px 10px;
  border: 1px solid var(--line-accent);
  border-radius: 999px;
  color: var(--cyan);
  background: var(--cyan-soft);
}
.flow-prd-chip {
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 10.5px;
  letter-spacing: 0.6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--label);
}

.flow-fm {
  margin: 4px 0 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0;
}
.flow-fm summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 11.5px;
  font-family: "SF Mono", ui-monospace, monospace;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 9px 14px;
  list-style: none;
}
.flow-fm summary::before {
  content: "▸ ";
  margin-right: 4px;
  display: inline-block;
  transition: transform .15s;
}
.flow-fm[open] summary::before { transform: rotate(90deg); }
.flow-fm pre {
  margin: 0; padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--label);
  white-space: pre-wrap;
  background: var(--bg-elev);
}

.flow-body { color: var(--label); }
.flow-body h2 {
  margin: 32px 0 12px;
  font-size: 18px;
  color: var(--text);
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--line);
  display: flex; align-items: center; gap: 10px;
}
.flow-body h2::before {
  content: "";
  display: inline-block;
  width: 14px; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  border-radius: 2px;
}
.flow-body h2:first-child { margin-top: 0; }
.flow-body h3 {
  margin: 18px 0 6px;
  font-size: 14.5px;
  color: var(--text);
  font-family: "SF Mono", ui-monospace, monospace;
}
.flow-body p { margin: 8px 0; }
.flow-body ol, .flow-body ul { padding-left: 22px; }
.flow-body li { margin: 4px 0; }
.flow-body strong, .flow-body b { color: var(--text); }
.flow-body table {
  border-collapse: collapse;
  width: 100%;
  font-size: 12.5px;
  margin: 12px 0;
}
.flow-body th, .flow-body td {
  border: 1px solid var(--line);
  padding: 7px 10px;
  text-align: left;
  vertical-align: top;
}
.flow-body th {
  background: var(--surface);
  color: var(--text);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.flow-body tr:nth-child(even) td { background: rgba(17, 23, 34, 0.4); }
.flow-body code {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--cyan);
}
.flow-body pre {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.55;
}
.flow-body pre code { background: transparent; border: none; padding: 0; color: var(--text); }
.flow-body blockquote {
  border-left: 3px solid var(--amber);
  padding: 10px 16px;
  margin: 14px 0;
  background: rgba(244, 182, 64, 0.06);
  border-radius: 0 8px 8px 0;
  color: var(--label);
}
.flow-body blockquote strong { color: var(--amber); }
.flow-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dotted var(--line-accent);
}
.flow-body a:hover { border-bottom-style: solid; color: #B7F8FF; }
.flow-body hr { border: none; border-top: 1px dashed var(--line); margin: 24px 0; }

/* Mermaid surface */
.mermaid {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  margin: 18px 0;
  text-align: center;
  position: relative;
  overflow-x: auto;
}
.mermaid::before {
  content: "SEQUENCE";
  position: absolute;
  top: 8px; left: 12px;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 9.5px;
  letter-spacing: 1.2px;
  color: var(--dim);
}
.mermaid svg { max-width: 100%; height: auto; }
.mermaid-error {
  color: var(--red);
  padding: 8px;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 12px;
}

/* footer --------------------------------------------------------------- */
#footer {
  border-top: 1px solid var(--line);
  padding: 14px 28px;
  color: var(--muted);
  font-size: 11.5px;
  font-family: "SF Mono", ui-monospace, monospace;
  letter-spacing: 0.3px;
  background: linear-gradient(0deg, rgba(11, 15, 24, 0.95), rgba(11, 15, 24, 0.6));
}
#footer code { background: transparent; padding: 0; color: var(--label); }

/* responsive ----------------------------------------------------------- */
@media (max-width: 900px) {
  #layout { grid-template-columns: 1fr; }
  #sidebar { position: static; max-height: none; border-right: none; border-bottom: 1px solid var(--line); }
  #content { padding: 24px 18px 60px; }
  #topbar { padding: 12px 18px; flex-wrap: wrap; gap: 10px; }
}