:root {
  --bg: #0b1020;
  --bg-soft: #111935;
  --panel: rgba(20, 29, 58, 0.7);
  --panel-2: rgba(16, 24, 49, 0.9);
  --text: #f2f5ff;
  --muted: #9ba8cc;
  --accent: #5c8dff;
  --accent-2: #8e5dff;
  --danger: #ff6e8a;
  --success: #43d38f;
  --border: rgba(151, 177, 255, 0.2);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
  --bg: #eef3ff;
  --bg-soft: #dce7ff;
  --panel: rgba(255, 255, 255, 0.8);
  --panel-2: rgba(248, 251, 255, 0.95);
  --text: #1f2a47;
  --muted: #66708d;
  --accent: #3f72ff;
  --accent-2: #7a4dff;
  --danger: #d94461;
  --success: #0f9f63;
  --border: rgba(96, 122, 196, 0.24);
  --shadow: 0 14px 28px rgba(43, 67, 130, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", ui-sans-serif, -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(92, 141, 255, 0.2) 0, transparent 34%),
    radial-gradient(circle at 88% 10%, rgba(142, 93, 255, 0.18) 0, transparent 30%),
    linear-gradient(155deg, var(--bg), var(--bg-soft) 56%, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel) 90%, transparent);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.topbar nav {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

a {
  color: color-mix(in oklab, var(--text) 85%, var(--accent));
  text-decoration: none;
  opacity: 0.92;
}

a:hover {
  opacity: 1;
}

.layout {
  max-width: 1100px;
  margin: 26px auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 0 16px 32px;
}

.layout.single {
  max-width: 900px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

label {
  font-weight: 600;
}

input,
textarea,
button {
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 11px 13px;
  font: inherit;
  width: 100%;
}

textarea {
  resize: vertical;
}

button {
  cursor: pointer;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  border: none;
  font-weight: 600;
  transition: transform 120ms ease, filter 120ms ease;
}

button:hover {
  transform: translateY(-1px);
  filter: saturate(1.06);
}

.danger {
  background: linear-gradient(120deg, var(--danger), color-mix(in oklab, var(--danger) 55%, var(--accent-2)));
}

.muted {
  color: var(--muted);
}

.error {
  color: var(--danger);
}

.success {
  color: var(--success);
}

.result {
  white-space: pre-wrap;
  background: color-mix(in oklab, var(--panel-2) 86%, black 14%);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.button-grid {
  display: grid;
  gap: 10px;
}

.button-grid form {
  display: grid;
  gap: 6px;
  align-content: start;
}

.chat-box {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: color-mix(in oklab, var(--panel-2) 93%, black 7%);
  display: grid;
  gap: 10px;
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.msg {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: color-mix(in oklab, var(--panel-2) 80%, black 20%);
}

.role {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.mini {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 8px;
  background: color-mix(in oklab, var(--panel-2) 70%, black 30%);
}

.task {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: color-mix(in oklab, var(--panel-2) 78%, black 22%);
}

.task-top {
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}

.task-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
  flex-wrap: wrap;
}

.btn-link {
  display: inline-block;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in oklab, var(--panel-2) 80%, black 20%);
}

.tabs-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 12px 0 14px;
}

.tab {
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel-2) 80%, black 20%);
  color: var(--text);
  font-weight: 700;
}

.tab-active {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  border: none;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel-2) 82%, black 18%);
  font-weight: 700;
}

.chat-shell {
  display: grid;
  gap: 12px;
}

.scroll {
  max-height: 62vh;
  overflow: auto;
  padding-right: 6px;
}

.older summary {
  cursor: pointer;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 10px;
}

.older-list {
  display: grid;
  gap: 10px;
  max-height: 36vh;
  overflow: auto;
  padding-right: 6px;
}

.composer {
  margin-top: 8px;
}

.grid-2 {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.callout {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: color-mix(in oklab, var(--panel-2) 85%, black 15%);
}

.topbar h1 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.2px;
}

.theme-toggle {
  padding: 10px 12px;
  border-radius: 12px;
  background: color-mix(in oklab, var(--panel-2) 75%, black 25%);
  border: 1px solid var(--border);
}

@media (max-width: 860px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}