:root {
  --bg: #0d0f12;
  --bg-deep: #08090b;
  --surface: #171a1f;
  --surface-soft: #1c2026;
  --surface-raised: #222733;
  --ink: #f3f5f8;
  --muted: #9ba3af;
  --muted-strong: #c3cad4;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --accent: #8fb7ff;
  --accent-hover: #b9d1ff;
  --accent-ink: #07111f;
  --accent-soft: rgba(143, 183, 255, 0.12);
  --success: #86d9ad;
  --danger: #ff9c9c;
  --radius: 8px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --shadow-soft: 0 12px 34px rgba(0, 0, 0, 0.22);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% -12%, rgba(143, 183, 255, 0.12), transparent 32rem),
    linear-gradient(180deg, var(--bg), var(--bg-deep));
  color: var(--ink);
  font-family:
    Inter, "SF Pro Display", "SF Pro Text", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

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

.app-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: rgba(9, 11, 14, 0.92);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 17px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-bottom: 6px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  background: #ffffff;
  color: #101318;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand strong,
.brand span {
  display: block;
}

.brand span,
.panel p,
.session-state,
.provider-card span {
  color: var(--muted);
  font-size: 12.5px;
}

.brand strong {
  font-size: 17px;
  line-height: 1.1;
}

.brand span {
  margin-top: 3px;
}

.new-chat,
.login-box button,
.prompt-workbench button {
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
  padding: 12px 15px;
  cursor: pointer;
  font-weight: 700;
  box-shadow: var(--shadow-soft);
  transition:
    transform 150ms ease,
    background 150ms ease,
    box-shadow 150ms ease;
}

.new-chat:hover,
.login-box button:hover,
.prompt-workbench button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.3);
}

.new-chat {
  width: 100%;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 9px;
}

.new-chat span {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  background: rgba(7, 17, 31, 0.14);
}

.panel {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.panel-label {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  font-weight: 800;
  color: #818b99;
}

.login-box {
  display: grid;
  gap: 8px;
}

.password-field {
  position: relative;
}

.password-field input {
  width: 100%;
  padding-right: 48px;
}

.login-box .password-toggle {
  position: absolute;
  top: 50%;
  right: 8px;
  width: 34px;
  height: 34px;
  padding: 0;
  display: grid;
  place-items: center;
  transform: translateY(-50%);
  background: transparent;
  color: var(--muted-strong);
  border: 0;
  box-shadow: none;
}

.login-box .password-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-50%);
  box-shadow: none;
}

.login-box.authenticated .password-field {
  display: none;
}

.login-box input,
.topbar select,
.prompt-workbench textarea,
.advanced-grid select {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #111419;
  padding: 11px 12px;
  outline: none;
  transition:
    border-color 150ms ease,
    box-shadow 150ms ease,
    background 150ms ease;
}

.login-box input {
  background: #111419;
  border-color: var(--line);
  color: var(--ink);
}

.login-box input::placeholder {
  color: #707987;
}

.login-box input:focus,
.topbar select:focus,
.prompt-workbench textarea:focus,
.advanced-grid select:focus {
  border-color: rgba(143, 183, 255, 0.78);
  box-shadow: 0 0 0 3px rgba(143, 183, 255, 0.13);
}

.session-state {
  margin: 8px 0 0;
}

.provider-list {
  display: grid;
  gap: 8px;
}

.provider-card {
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.025);
  transition:
    background 150ms ease,
    border-color 150ms ease,
    transform 150ms ease;
}

.provider-card:hover {
  background: rgba(255, 255, 255, 0.045);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.provider-card strong {
  color: var(--ink);
}

.provider-card strong,
.provider-card span {
  display: block;
}

.quiet {
  margin-top: auto;
}

.workspace {
  position: relative;
  display: grid;
  grid-template-rows: auto auto minmax(220px, 1fr);
  padding: 72px clamp(20px, 4vw, 60px) 30px;
  gap: 20px;
  min-width: 0;
  background:
    radial-gradient(circle at 62% 16%, rgba(143, 183, 255, 0.09), transparent 28rem),
    linear-gradient(180deg, rgba(13, 15, 18, 0.84), var(--bg-deep));
}

.language-switch {
  position: absolute;
  top: 22px;
  right: clamp(20px, 4vw, 60px);
  display: inline-flex;
  gap: 8px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
  backdrop-filter: blur(12px);
}

.language-button {
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted-strong);
  padding: 8px 11px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 800;
}

.flag-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.25));
}

.language-button:hover,
.language-button.active {
  background: rgba(143, 183, 255, 0.14);
  color: var(--ink);
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.eyebrow {
  color: var(--muted);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 12px;
  margin: 0 0 6px;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(24px, 2.45vw, 36px);
  line-height: 1.1;
  max-width: 980px;
  font-weight: 760;
}

h2 {
  font-size: clamp(26px, 2.85vw, 42px);
  line-height: 1.12;
  max-width: 860px;
  font-weight: 760;
}

.prompt-toolbar select,
.advanced-grid select {
  min-height: 46px;
  color: var(--ink);
  box-shadow: none;
  background: #111419;
}

.hero,
.chat-card,
.prompt-workbench {
  background: rgba(32, 32, 32, 0.86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero {
  padding: clamp(16px, 2.5vw, 28px) 0 0;
  display: grid;
  place-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: transparent;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.hero::after {
  content: none;
}

.status-pill {
  display: inline-flex;
  width: fit-content;
  padding: 7px 11px;
  margin: 0 auto 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #d7e5ff;
  font-size: 13px;
  font-weight: 800;
  border: 1px solid rgba(143, 183, 255, 0.24);
}

.hero-copy {
  max-width: 710px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.7;
}

.prompt-workbench {
  padding: clamp(20px, 2.8vw, 30px);
  display: grid;
  gap: 16px;
  max-width: 880px;
  width: 100%;
  justify-self: center;
  background: rgba(23, 26, 31, 0.92);
  border-color: rgba(255, 255, 255, 0.1);
}

.prompt-heading {
  display: grid;
  gap: 6px;
}

.section-kicker {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.prompt-heading h2 {
  font-size: clamp(21px, 2vw, 29px);
  max-width: 760px;
}

.prompt-toolbar,
.advanced-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(210px, 1fr));
  gap: 12px;
}

.prompt-toolbar label,
.advanced-grid label {
  display: grid;
  gap: 7px;
  color: var(--muted-strong);
  font-size: 13px;
  font-weight: 700;
}

.prompt-toolbar select,
.advanced-grid select,
.prompt-workbench textarea {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  outline: none;
}

.task-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 8px;
}

.prompt-workbench .task-card {
  appearance: none;
  text-align: center;
  display: grid;
  place-items: center;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.025);
  color: var(--ink);
  box-shadow: none;
  transform: none;
}

.prompt-workbench .task-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--line-strong);
  transform: translateY(-1px);
  box-shadow: none;
}

.prompt-workbench .task-card.active {
  background: rgba(143, 183, 255, 0.12);
  border-color: rgba(143, 183, 255, 0.42);
}

.task-card strong {
  font-size: 13.5px;
  line-height: 1.2;
}

.prompt-workbench textarea {
  width: 100%;
  min-height: 230px;
  resize: vertical;
  background: rgba(8, 10, 12, 0.64);
  color: var(--ink);
  padding: 17px;
  line-height: 1.65;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.prompt-workbench textarea::placeholder {
  color: #78818f;
}

.prompt-toolbar select:focus,
.prompt-workbench textarea:focus {
  border-color: rgba(143, 183, 255, 0.84);
  box-shadow: 0 0 0 3px rgba(143, 183, 255, 0.13);
}

.chat-card {
  min-height: 0;
  overflow: hidden;
  background: transparent;
  box-shadow: none;
}

.conversation {
  padding: 26px 24px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  max-width: 920px;
}

.message.user {
  align-self: flex-end;
  grid-template-columns: minmax(0, 1fr) 36px;
}

.message.user .avatar {
  grid-column: 2;
}

.message.user .bubble {
  grid-row: 1;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #202631;
  color: var(--ink);
  font-weight: 800;
  border: 1px solid var(--line-strong);
}

.message.assistant .avatar {
  background: linear-gradient(145deg, #222a36, #0b0d11);
  color: var(--accent-hover);
  border-color: transparent;
}

.bubble {
  background: rgba(28, 32, 38, 0.94);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 15px;
  line-height: 1.55;
  white-space: pre-wrap;
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.18);
}

.message.user .bubble {
  background: #232a35;
  color: var(--ink);
  border-color: var(--line-strong);
}

.bubble p {
  margin: 6px 0 0;
}

.composer-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.advanced-options {
  min-width: min(620px, 100%);
}

.advanced-options summary {
  width: fit-content;
  cursor: pointer;
  color: var(--muted-strong);
  font-size: 13px;
  font-weight: 800;
  list-style-position: outside;
}

.advanced-grid {
  margin-top: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.025);
}

.range-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
}

.tuning {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}

.prompt-workbench button:disabled {
  cursor: wait;
  opacity: 0.76;
  transform: none;
}

.tuning label {
  display: flex;
  align-items: center;
  gap: 10px;
}

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

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

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    position: static;
    height: auto;
  }

  .workspace {
    padding: 76px 18px 18px;
  }

  .language-switch {
    left: 18px;
    right: auto;
  }

  .topbar {
    grid-template-columns: 1fr;
    display: grid;
  }

  .prompt-toolbar {
    grid-template-columns: 1fr;
  }

  .task-grid {
    grid-template-columns: 1fr;
  }

  .advanced-grid {
    grid-template-columns: 1fr;
  }

  .composer-footer {
    display: grid;
  }

  .hero {
    text-align: left;
    place-items: start;
  }

  .status-pill {
    margin-left: 0;
  }

  .hero-copy {
    margin-left: 0;
  }

}