/* HUMAN Playground — blueprint theme
   Palette:
   --ink        #0E1F36  deep blueprint navy (page)
   --panel      #14304F  blueprint panel
   --line       #8FD0E8  cyan drafting lines
   --paper      #F3F0E7  human-side paper
   --paper-ink  #24303C  text on paper
   --amber      #FFB94F  action accent
   Type: Space Grotesk (display) / IBM Plex Sans (body) / IBM Plex Mono (contract)
*/

:root {
  --ink: #0E1F36;
  --panel: #14304F;
  --panel-edge: #2A4A6E;
  --line: #8FD0E8;
  --line-dim: rgba(143, 208, 232, 0.35);
  --paper: #F3F0E7;
  --paper-ink: #24303C;
  --text: #D7E3EE;
  --text-dim: #93A9BD;
  --amber: #FFB94F;
  --amber-ink: #3A2A0A;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    linear-gradient(rgba(143,208,232,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143,208,232,0.045) 1px, transparent 1px),
    var(--ink);
  background-size: 32px 32px, 32px 32px, auto;
  color: var(--text);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  line-height: 1.55;
  min-height: 100vh;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

/* ---------- header ---------- */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.5rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line-dim);
}

.wordmark { display: flex; align-items: baseline; gap: 0.6rem; }

.wordmark-h {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.34em;
  color: var(--line);
}

.wordmark-sub {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.header-links { display: flex; gap: 1rem; align-items: center; }

.header-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--line-dim);
  padding-bottom: 1px;
}
.header-links a:hover, .header-links a:focus-visible { color: var(--line); border-color: var(--line); }

.lang-toggle {
  font: inherit;
  font-size: 0.85rem;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--panel-edge);
  border-radius: 4px;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
}
.lang-toggle strong { color: var(--amber); }
.lang-toggle:hover, .lang-toggle:focus-visible { border-color: var(--line); }

/* ---------- intro ---------- */

.intro {
  max-width: 46rem;
  padding: clamp(2rem, 6vw, 3.5rem) clamp(1rem, 4vw, 3rem) 1rem;
}

.intro h1 {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 0.9rem;
  color: #FFFFFF;
}

.intro p { margin: 0; color: var(--text-dim); max-width: 40rem; }
.intro em { color: var(--line); font-style: normal; font-family: "IBM Plex Mono", monospace; font-size: 0.92em; }

/* ---------- workbench layout ---------- */

.workbench {
  display: grid;
  grid-template-columns: minmax(0, 5fr) auto minmax(0, 6fr);
  gap: clamp(1rem, 2.5vw, 2rem);
  padding: 2rem clamp(1rem, 4vw, 3rem) 3rem;
  align-items: start;
}

.panel { border-radius: 8px; padding: 1.4rem; }

.panel-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

/* human side = paper */

.panel-human {
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}
.panel-human .panel-title { color: #7A6E52; }

#human-input {
  width: 100%;
  font: 1rem/1.5 "IBM Plex Sans", sans-serif;
  color: var(--paper-ink);
  background: transparent;
  border: none;
  border-bottom: 2px solid #C9C2AF;
  resize: vertical;
  padding: 0.2rem 0 0.6rem;
}
#human-input:focus { outline: none; border-bottom-color: var(--amber); }
#human-input::placeholder { color: #9A917B; }

.examples { display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: center; margin: 0.9rem 0 1.2rem; }
.examples-label { font-size: 0.8rem; color: #7A6E52; }

.chip {
  font: 0.8rem "IBM Plex Sans", sans-serif;
  background: transparent;
  color: var(--paper-ink);
  border: 1px solid #C9C2AF;
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  cursor: pointer;
}
.chip:hover, .chip:focus-visible { border-color: var(--paper-ink); background: rgba(36,48,60,0.06); }

.btn-primary {
  font: 600 0.95rem "Space Grotesk", sans-serif;
  letter-spacing: 0.03em;
  background: var(--amber);
  color: var(--amber-ink);
  border: none;
  border-radius: 6px;
  padding: 0.75rem 1.4rem;
  cursor: pointer;
  width: 100%;
}
.btn-primary:hover { filter: brightness(1.06); }
.btn-primary:focus-visible { outline: 3px solid var(--line); outline-offset: 2px; }

/* loop spine — signature element */

.loop-spine {
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
  padding-top: 2.6rem;
  position: relative;
}

.loop-spine::before {
  content: "";
  position: absolute;
  top: 3rem; bottom: 0.6rem; left: 50%;
  width: 1px;
  background: var(--line-dim);
}

.loop-step {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.loop-step b {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1rem;
  width: 2.1rem; height: 2.1rem;
  display: grid; place-items: center;
  border: 1px solid var(--line-dim);
  border-radius: 50%;
  background: var(--ink);
  color: var(--text-dim);
  transition: color 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.loop-step i {
  font-style: normal;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

.loop-step.active b {
  color: var(--ink);
  background: var(--line);
  border-color: var(--line);
  box-shadow: 0 0 14px rgba(143, 208, 232, 0.55);
}
.loop-step.active i { color: var(--line); }

/* agent side = blueprint */

.panel-agent {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
}
.panel-agent .panel-title { color: var(--line); margin-bottom: 0; }

.panel-agent-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.domain-badge {
  font: 500 0.7rem "IBM Plex Mono", monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  border: 1px solid rgba(255, 185, 79, 0.45);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
}

.output-tabs { display: flex; gap: 0.4rem; margin-bottom: 0.8rem; }

.output-tabs [role="tab"] {
  font: 500 0.8rem "IBM Plex Mono", monospace;
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--panel-edge);
  border-radius: 5px;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
}
.output-tabs [role="tab"][aria-selected="true"] {
  color: var(--ink);
  background: var(--line);
  border-color: var(--line);
}
.output-tabs [role="tab"]:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

.output {
  margin: 0;
  background: rgba(8, 20, 38, 0.65);
  border: 1px solid var(--panel-edge);
  border-radius: 6px;
  padding: 1rem;
  min-height: 16rem;
  max-height: 26rem;
  overflow: auto;
  font: 0.8rem/1.6 "IBM Plex Mono", monospace;
  color: var(--line);
  white-space: pre-wrap;
  word-break: break-word;
}
.output:focus-visible { outline: 2px solid var(--amber); }

.output-actions { display: flex; gap: 0.6rem; margin-top: 0.9rem; }

.btn-secondary {
  font: 500 0.85rem "IBM Plex Sans", sans-serif;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--panel-edge);
  border-radius: 5px;
  padding: 0.45rem 1.1rem;
  cursor: pointer;
}
.btn-secondary:hover:not(:disabled), .btn-secondary:focus-visible { border-color: var(--line); color: var(--line); }
.btn-secondary:disabled { opacity: 0.45; cursor: not-allowed; }

/* editor */

.editor { margin-top: 1.2rem; border-top: 1px dashed var(--panel-edge); padding-top: 0.9rem; }
.editor summary {
  cursor: pointer;
  font: 500 0.85rem "IBM Plex Sans", sans-serif;
  color: var(--text-dim);
}
.editor summary:hover { color: var(--line); }

.editor-grid { display: grid; gap: 0.9rem; margin-top: 1rem; }

.editor-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-dim);
}
.editor-grid small { color: var(--text-dim); }

.editor-grid input, .editor-grid textarea {
  font: 0.85rem/1.5 "IBM Plex Mono", monospace;
  color: var(--text);
  background: rgba(8, 20, 38, 0.65);
  border: 1px solid var(--panel-edge);
  border-radius: 5px;
  padding: 0.5rem 0.65rem;
  resize: vertical;
}
.editor-grid input:focus, .editor-grid textarea:focus { outline: none; border-color: var(--line); }

/* footer */

.site-footer {
  border-top: 1px solid var(--line-dim);
  padding: 1.4rem clamp(1rem, 4vw, 3rem) 2rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.site-footer a { color: var(--text); }
.site-footer a:hover { color: var(--line); }

/* responsive */

@media (max-width: 900px) {
  .workbench { grid-template-columns: 1fr; }
  .loop-spine {
    flex-direction: row;
    justify-content: center;
    gap: 1.2rem;
    padding-top: 0;
  }
  .loop-spine::before {
    top: 50%; left: 12%; right: 12%; bottom: auto;
    width: auto; height: 1px;
    transform: translateY(-1.05rem);
  }
  .loop-step i { display: none; }
}

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