/* ===== Design tokens =====
   Direction: engineering blueprint. Deep navy "drafting table" background,
   cyan trace lines, a single warm amber accent used like a highlighter pen.
   Everything technical is set in mono; everything human is set in Inter.
*/
:root {
  --bg: #0a1930;
  --bg-deep: #071224;
  --grid-line: rgba(143, 211, 255, 0.07);
  --panel: #0f2444;
  --panel-2: #0c1d3a;
  --panel-border: rgba(143, 211, 255, 0.16);
  --cyan: #7fd1ff;
  --cyan-dim: rgba(127, 209, 255, 0.55);
  --amber: #ff9f5a;
  --mint: #6ee7b7;
  --red: #ff8a8a;
  --text: #eaf4ff;
  --text-muted: #7c93b3;
  --text-faint: #6c82aa;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius: 6px;
}

* { box-sizing: border-box; }

/* Ensure the HTML `hidden` attribute always wins over CSS display rules */
[hidden] { display: none !important; }


@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* Ambient blueprint grid */
.blueprint-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 85%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 85%);
}

/* ===== Header ===== */
.site-header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px clamp(20px, 4vw, 48px);
  border-bottom: 1px solid var(--panel-border);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 30px; height: 30px; color: var(--cyan); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.header-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--text-faint);
  padding-bottom: 2px;
  white-space: nowrap;
}
.header-link:hover { color: var(--cyan); border-color: var(--cyan-dim); }

/* ===== Layout ===== */
.layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 22px;
  padding: clamp(20px, 3vw, 40px) clamp(20px, 4vw, 48px) 40px;
  align-items: start;
}

@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: clamp(20px, 2.6vw, 30px);
  position: relative;
}

.panel::before {
  /* corner brackets — the blueprint signature motif, reused everywhere */
  content: "";
  position: absolute;
  inset: 8px;
  pointer-events: none;
  border: none;
}

/* ===== Input panel ===== */
.input-panel h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  line-height: 1.2;
  margin: 0 0 12px;
}

.lede {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0 0 26px;
}
.lede code {
  font-family: var(--font-mono);
  color: var(--cyan);
  background: rgba(127, 209, 255, 0.08);
  padding: 1px 5px;
  border-radius: 3px;
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

textarea {
  width: 100%;
  min-height: 108px;
  resize: vertical;
  background: var(--bg-deep);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 14px;
  line-height: 1.5;
}
textarea::placeholder { color: var(--text-faint); }
textarea:focus { border-color: var(--cyan-dim); }

.char-count {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
  margin-top: 6px;
}

.example-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 24px;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 7px 13px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.chip:hover { border-color: var(--cyan-dim); color: var(--cyan); }

.btn-primary {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--cyan);
  color: var(--bg-deep);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 20px;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}
.btn-primary:hover { box-shadow: 0 0 0 3px rgba(127, 209, 255, 0.18); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.6; cursor: progress; }
.btn-icon { width: 18px; height: 18px; }

.error-box {
  margin-top: 14px;
  padding: 12px 14px;
  background: rgba(255, 138, 138, 0.08);
  border: 1px solid rgba(255, 138, 138, 0.35);
  border-radius: var(--radius);
  color: var(--red);
  font-size: 0.85rem;
}

.api-settings-link {
  display: block;
  margin-top: 20px;
  background: none;
  border: none;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 0;
}
.api-settings-link:hover { color: var(--text-muted); }
.api-settings-link span { color: var(--cyan-dim); }

/* ===== Output panel ===== */
.output-panel { min-height: 520px; display: flex; flex-direction: column; }

.output-header { margin-bottom: 18px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--panel-border); }
.tab {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 4px;
  margin-right: 18px;
  cursor: pointer;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--cyan); border-bottom-color: var(--cyan); }

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  gap: 16px;
  padding: 40px 20px;
  text-align: center;
}
.empty-state svg { width: 110px; height: auto; }
.empty-state p { margin: 0; font-size: 0.9rem; }

.loading-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.loading-trace {
  width: 180px;
  height: 2px;
  background: var(--panel-border);
  position: relative;
  overflow: hidden;
  border-radius: 2px;
}
.loading-trace::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: -40%;
  width: 40%;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  animation: trace-sweep 1.1s ease-in-out infinite;
}
@keyframes trace-sweep {
  0% { left: -40%; }
  100% { left: 100%; }
}

.result-state { flex: 1; display: flex; flex-direction: column; }

.architecture-summary {
  font-size: 0.92rem;
  color: var(--text-muted);
  border-left: 2px solid var(--cyan-dim);
  padding-left: 14px;
  margin: 0 0 20px;
}

.tab-view { flex: 1; }

.diagram-mount { width: 100%; }
.diagram-mount svg { width: 100%; height: auto; display: block; }

.code-view { position: relative; }
.code-view pre {
  background: var(--bg-deep);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin: 0;
}
.code-view code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
  z-index: 2;
}
.copy-btn:hover { color: var(--cyan); border-color: var(--cyan-dim); }
.copy-btn.copied { color: var(--mint); border-color: var(--mint); }

/* ===== Footer ===== */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  padding: 20px;
}