:root {
  --void: #05040f;
  --nebula-violet: #8b5cf6;
  --nebula-cyan: #22d3ee;
  --nebula-magenta: #e879f9;

  --primary-gradient: linear-gradient(135deg, #8b5cf6, #22d3ee);

  --glass-bg: rgba(21, 15, 51, 0.5);
  --glass-border: rgba(167, 163, 201, 0.16);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.35);

  --text: #f4f2ff;
  --text-secondary: #a7a3c9;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-solid: #12102a;

  --error: #ff6b81;

  --radius-l: 20px;
  --radius-m: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  background:
    radial-gradient(circle at 0% 0%, rgba(139, 92, 246, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 100% 0%, rgba(34, 211, 238, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 100% 100%, rgba(232, 121, 249, 0.1) 0%, transparent 45%),
    var(--void);
  background-attachment: fixed;
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* Page wrapper */
.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

/* Top bar */
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* Logo */
.logo {
  font-family: 'Unbounded', sans-serif;
  font-size: 26px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
}
.logo .shiwan { color: var(--nebula-violet); }
.logo .online { color: var(--nebula-cyan); }
.logo:focus-visible { outline: 2px solid var(--nebula-cyan); outline-offset: 4px; border-radius: 6px; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  text-decoration: none;
  border: 1px solid var(--glass-border);
  padding: 8px 14px;
  border-radius: 10px;
  transition: 0.2s;
}
.back-link:hover { background: rgba(255,255,255,0.12); }
.back-link:focus-visible { outline: 2px solid var(--nebula-cyan); outline-offset: 2px; }

/* Title */
.title {
  margin-top: 24px;
  font-family: 'Unbounded', sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.subtitle {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Layout: panels */
.layout {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.panel {
  background: var(--glass-bg);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-radius: var(--radius-l);
  border: 1px solid var(--glass-border);
  padding: 20px 20px 22px;
  box-shadow: var(--glass-shadow);
}

.panel-title {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--nebula-cyan);
  font-weight: 700;
  margin-bottom: 14px;
}

/* Inputs */
.row {
  margin-bottom: 14px;
}

.row label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.row-inline {
  display: flex;
  gap: 8px;
}

#method {
  width: 110px;
  flex-shrink: 0;
  color-scheme: dark;
}

#url {
  flex: 1;
  min-width: 0;
}

select,
input,
textarea {
  padding: 10px 12px;
  border-radius: var(--radius-m);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  outline: none;
  transition: 0.2s;
}

input, textarea { width: 100%; }

textarea {
  resize: vertical;
  min-height: 60px;
  max-height: 260px;
}

select:focus, input:focus, textarea:focus {
  background: rgba(255,255,255,0.1);
  border-color: rgba(139,92,246,0.5);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.2);
}

input::placeholder, textarea::placeholder { color: var(--text-secondary); }

/* Send button */
.btn {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-m);
  border: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  background: var(--primary-gradient);
  color: white;
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 14px rgba(139,92,246,0.3);
}
.btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn:active { transform: scale(0.98); }
.btn:focus-visible { outline: 2px solid var(--nebula-cyan); outline-offset: 2px; }

/* Error */
.error {
  margin-top: 10px;
  font-size: 12px;
  color: var(--error);
  min-height: 16px;
}

/* Response meta */
.response-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
}

/* Tabs */
.response-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}
.tab-btn {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: 0.2s;
  font-family: inherit;
}
.tab-btn:hover { background: rgba(255,255,255,0.12); color: var(--text); }
.tab-btn.active {
  border-color: transparent;
  background: var(--primary-gradient);
  color: white;
}
.tab-btn:focus-visible { outline: 2px solid var(--nebula-cyan); outline-offset: 2px; }

/* Response boxes */
.response-box {
  min-height: 180px;
  max-height: 380px;
  overflow: auto;
  padding: 12px;
  border-radius: var(--radius-m);
  border: 1px solid var(--glass-border);
  background: var(--surface-solid);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}
.hidden {
  display: none;
}

/* Hint */
.hint {
  margin-top: 10px;
  font-size: 11px;
  color: var(--text-secondary);
}

/* Mobile */
@media (max-width: 800px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .page {
    padding: 16px 12px 24px;
  }
  .logo {
    font-size: 22px;
  }
}