:root {
  --bg: #f4f0e8;
  --bg-soft: #fbfaf7;
  --surface: rgba(255, 252, 246, 0.76);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(34, 44, 55, 0.12);
  --text: #18222d;
  --muted: #5d6b78;
  --accent: #117a65;
  --accent-strong: #0f5f50;
  --accent-soft: rgba(17, 122, 101, 0.14);
  --warn: #c26b2f;
  --shadow-lg: 0 28px 68px rgba(32, 36, 43, 0.12);
  --shadow-md: 0 14px 30px rgba(32, 36, 43, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --transition: 180ms cubic-bezier(0.22, 0.9, 0.28, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(239, 147, 78, 0.16), transparent 24%),
    radial-gradient(circle at right 20%, rgba(17, 122, 101, 0.18), transparent 22%),
    linear-gradient(180deg, #fcfaf6 0%, #f3efe7 44%, #ece6dc 100%);
}

button,
input,
select,
textarea {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

button {
  cursor: pointer;
}

.ambient {
  position: fixed;
  border-radius: 999px;
  filter: blur(24px);
  pointer-events: none;
}

.ambient-left {
  top: -120px;
  left: -80px;
  width: 320px;
  height: 320px;
  background: rgba(239, 147, 78, 0.16);
}

.ambient-right {
  right: -120px;
  bottom: -80px;
  width: 360px;
  height: 360px;
  background: rgba(17, 122, 101, 0.16);
}

.shell {
  width: min(calc(100% - 28px), 1600px);
  margin: 14px auto;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 18px;
}

.panel {
  border: 1px solid rgba(255, 255, 255, 0.75);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 252, 246, 0.72)),
    rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(18px) saturate(1.05);
}

.sidebar,
.workspace {
  display: grid;
  gap: 18px;
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 14px;
}

.brand-card,
.nav-card,
.status-card,
.note-card,
.hero,
.stat-card,
.settings-panel,
.chat-panel {
  border-radius: var(--radius-xl);
}

.brand-card,
.nav-card,
.status-card,
.note-card {
  padding: 20px;
}

.brand-card {
  display: flex;
  gap: 16px;
  align-items: center;
}

.brand-mark {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fdfcf8;
  background: linear-gradient(135deg, #1b8f76, #0f5f50);
  box-shadow: 0 18px 32px rgba(15, 95, 80, 0.22);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: rgba(24, 34, 45, 0.48);
}

h1,
h2,
h3,
p,
ul,
pre {
  margin: 0;
}

h1,
h2,
h3 {
  letter-spacing: -0.04em;
}

h1 {
  font-size: 1.65rem;
}

h2 {
  font-size: clamp(1.8rem, 2vw, 2.65rem);
  line-height: 1.06;
}

h3 {
  font-size: 1.25rem;
}

.nav-list {
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.nav-item {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(17, 122, 101, 0.06);
  color: var(--muted);
}

.nav-item.active {
  background: linear-gradient(135deg, rgba(17, 122, 101, 0.14), rgba(239, 147, 78, 0.14));
  color: var(--text);
  font-weight: 700;
}

.status-card,
.note-card {
  display: grid;
  gap: 14px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.95rem;
}

.status-row span,
.note-card p {
  color: var(--muted);
}

.hero {
  padding: 24px 28px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.hero-copy {
  margin-top: 12px;
  max-width: 68ch;
  color: var(--muted);
}

.hero-actions,
.chat-actions,
.composer-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stat-card {
  padding: 18px 20px;
  display: grid;
  gap: 6px;
}

.stat-card span,
.stat-card small {
  color: var(--muted);
}

.stat-card strong {
  font-size: 1.5rem;
  letter-spacing: -0.04em;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 18px;
}

.settings-panel,
.chat-panel {
  padding: 22px;
  display: grid;
  gap: 18px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.settings-form,
.composer {
  display: grid;
  gap: 16px;
}

.settings-primary-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.86fr) minmax(0, 1.14fr);
  gap: 14px;
  align-items: start;
}

.system-prompt-field textarea {
  min-height: 208px;
}

.advanced-settings {
  border: 1px solid rgba(24, 34, 45, 0.08);
  border-radius: 22px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(246, 241, 233, 0.56));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.72);
}

.advanced-settings-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.advanced-settings-head strong {
  letter-spacing: -0.02em;
}

.advanced-settings-body {
  display: grid;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(24, 34, 45, 0.08);
}

.settings-panel.is-collapsed .advanced-settings {
  padding-bottom: 14px;
}

.settings-panel.is-collapsed .system-prompt-field textarea {
  min-height: 248px;
}

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

.field-grid.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 8px;
}

.field-wide {
  grid-column: 1 / -1;
}

.field span {
  font-size: 0.92rem;
  color: var(--muted);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.field textarea {
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: rgba(17, 122, 101, 0.4);
  box-shadow: 0 0 0 4px rgba(17, 122, 101, 0.12);
}

.model-picker {
  position: relative;
}

.model-trigger {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(249, 245, 238, 0.78)),
    rgba(255, 255, 255, 0.72);
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.72);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.model-trigger:hover {
  transform: translateY(-1px);
}

.model-trigger:focus-visible,
.model-picker.is-open .model-trigger {
  outline: none;
  border-color: rgba(17, 122, 101, 0.42);
  box-shadow:
    0 0 0 4px rgba(17, 122, 101, 0.12),
    0 18px 30px rgba(24, 34, 45, 0.08);
}

.model-trigger-copy {
  min-width: 0;
  display: grid;
  gap: 4px;
  text-align: left;
}

.model-trigger-copy strong,
.model-trigger-copy small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.model-trigger-copy strong {
  font-size: 1rem;
  letter-spacing: -0.03em;
}

.model-trigger-copy small {
  color: var(--muted);
}

.model-trigger-arrow {
  flex: none;
  font-size: 1.25rem;
  color: var(--accent-strong);
  transition: transform var(--transition);
}

.model-picker.is-open .model-trigger-arrow {
  transform: rotate(180deg);
}

.model-popover {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: 0;
  z-index: 20;
  padding: 12px;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(250, 247, 241, 0.92)),
    rgba(255, 255, 255, 0.78);
  box-shadow: 0 26px 52px rgba(20, 28, 36, 0.14);
  backdrop-filter: blur(20px) saturate(1.05);
}

.model-search-shell {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  min-height: 48px;
  border-radius: 16px;
  border: 1px solid rgba(24, 34, 45, 0.08);
  background: rgba(255, 255, 255, 0.82);
}

.model-search-icon {
  color: var(--muted);
}

.model-search-input {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 0;
}

.model-search-input:focus {
  outline: none;
}

.model-options {
  margin-top: 10px;
  max-height: 320px;
  overflow: auto;
  display: grid;
  gap: 8px;
  padding-right: 4px;
}

.model-options::-webkit-scrollbar {
  width: 10px;
}

.model-options::-webkit-scrollbar-thumb {
  background: rgba(17, 122, 101, 0.18);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.model-option {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 16px;
  padding: 12px 14px;
  text-align: left;
  background: rgba(255, 255, 255, 0.58);
  display: grid;
  gap: 5px;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.model-option:hover,
.model-option.is-active {
  transform: translateY(-1px);
  background: rgba(17, 122, 101, 0.09);
  border-color: rgba(17, 122, 101, 0.18);
}

.model-option.is-selected {
  background: linear-gradient(135deg, rgba(17, 122, 101, 0.16), rgba(239, 147, 78, 0.14));
  border-color: rgba(17, 122, 101, 0.2);
}

.model-option-name {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.model-option-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.86rem;
}

.model-option-empty {
  padding: 24px 18px;
  border-radius: 16px;
  text-align: center;
  color: var(--muted);
  background: rgba(24, 34, 45, 0.04);
}

.field-note,
.composer-hint {
  color: var(--muted);
  font-size: 0.85rem;
}

.switch-toggle {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.6);
  align-content: center;
}

.switch-toggle input {
  width: 18px;
  height: 18px;
  justify-self: start;
}

.message-list {
  min-height: 520px;
  max-height: 72vh;
  overflow: auto;
  display: grid;
  gap: 14px;
  padding-right: 4px;
}

.message-card {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.76);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-md);
}

.message-card.role-user {
  background: linear-gradient(135deg, rgba(17, 122, 101, 0.12), rgba(255, 255, 255, 0.9));
}

.message-card.role-assistant {
  background: linear-gradient(135deg, rgba(239, 147, 78, 0.1), rgba(255, 255, 255, 0.92));
}

.message-card.role-system {
  background: rgba(24, 34, 45, 0.04);
}

.message-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 0.84rem;
  color: var(--muted);
}

.message-role {
  font-weight: 700;
  text-transform: capitalize;
  color: var(--text);
}

.message-body {
  white-space: pre-wrap;
  line-height: 1.65;
}

.reasoning-block {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.reasoning-block summary {
  cursor: pointer;
  color: var(--accent-strong);
  font-weight: 600;
}

.reasoning-content {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(24, 34, 45, 0.05);
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86rem;
}

.composer {
  padding-top: 6px;
  border-top: 1px solid var(--line);
}

.primary-button,
.ghost-button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  transition: transform var(--transition), opacity var(--transition), background var(--transition);
}

.primary-button {
  color: #fdfcf8;
  background: linear-gradient(135deg, #1b8f76, #0f5f50);
  box-shadow: 0 16px 24px rgba(15, 95, 80, 0.22);
}

.ghost-button {
  color: var(--text);
  background: rgba(255, 255, 255, 0.64);
  border: 1px solid rgba(24, 34, 45, 0.08);
}

.subtle-button {
  color: var(--accent-strong);
  background: rgba(17, 122, 101, 0.08);
}

.ghost-button.compact {
  padding: 10px 14px;
}

.primary-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
}

.primary-button:disabled,
.ghost-button:disabled {
  cursor: not-allowed;
  opacity: 0.56;
  transform: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(17, 122, 101, 0.1);
  color: var(--accent-strong);
  font-size: 0.85rem;
  font-weight: 700;
}

.chip.is-pending {
  background: rgba(239, 147, 78, 0.16);
  color: var(--warn);
}

.chip.is-error {
  background: rgba(194, 107, 47, 0.14);
  color: #9a4c18;
}

.empty-state {
  min-height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  border: 1px dashed rgba(24, 34, 45, 0.12);
  border-radius: 22px;
  padding: 36px 20px;
}

@media (max-width: 1180px) {
  .shell,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .settings-primary-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(calc(100% - 18px), 100%);
    margin: 9px auto;
  }

  .hero,
  .panel-head,
  .composer-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .stats-grid,
  .field-grid,
  .field-grid.two-up {
    grid-template-columns: 1fr;
  }

  .message-list {
    min-height: 420px;
    max-height: none;
  }
}