:root {
  color-scheme: light;
  --bg: #edf2f8;
  --bg-accent: #d9e7ff;
  --panel: #ffffff;
  --text: #152033;
  --muted: #5b6b81;
  --border: #d5deea;
  --brand: #0b5fff;
  --brand-dark: #0846c2;
  --brand-soft: #eaf1ff;
  --success: #0f7b4a;
  --error: #b42318;
  --shadow: 0 18px 50px rgba(21, 32, 51, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(11, 95, 255, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 123, 74, 0.08), transparent 22%),
    linear-gradient(180deg, #f7faff 0%, var(--bg) 48%, #e8eef6 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(213, 222, 234, 0.9);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
}

.site-header__inner,
.site-main {
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
}

.site-header__mark {
  width: 0.85rem;
  height: 2rem;
  border-radius: 999px;
  background: linear-gradient(180deg, #3b82f6, #0b5fff 55%, #00a1ff);
  box-shadow: 0 0 0 6px rgba(11, 95, 255, 0.08);
}

.site-header__product,
.chat-intro__eyebrow,
.login-card__eyebrow {
  display: block;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-header__title {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
}

.site-header__signout {
  appearance: none;
  border: 1px solid var(--border);
  background: white;
  color: var(--text);
  border-radius: 999px;
  padding: 0.65rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.site-header__signout:hover {
  border-color: #b8c7db;
  background: #f8fbff;
}

.site-main {
  padding: 2rem 0 3.5rem;
}

.chat-intro {
  margin-bottom: 1.25rem;
}

.chat-intro h1,
.login-card__title {
  margin: 0.35rem 0 0.75rem;
  font-size: clamp(2rem, 4vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.chat-intro p,
.login-card__copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  max-width: 42rem;
}

.chat-page {
  display: grid;
  gap: 1rem;
}

.chat-page__panel {
  background: var(--panel);
  border: 1px solid rgba(213, 222, 234, 0.95);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.35rem;
}

.chat-page__examples {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.chat-page__chip {
  appearance: none;
  border: 1px solid var(--border);
  background: #f7faff;
  color: var(--text);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}

.chat-page__chip:hover:not(:disabled) {
  border-color: #9db7ef;
  background: var(--brand-soft);
  transform: translateY(-1px);
}

.chat-page__chip:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.chat-page__form {
  display: grid;
  gap: 0.8rem;
}

.chat-page__label-row,
.chat-page__answer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.chat-page__label,
.chat-page__answer-title {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
}

.chat-page__hint,
.chat-page__meta {
  color: var(--muted);
  font-size: 0.88rem;
}

.chat-page__input {
  width: 100%;
  min-height: 132px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.05rem;
  font: inherit;
  line-height: 1.55;
  background: #fbfcff;
  transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.chat-page__input:focus {
  outline: none;
  border-color: var(--brand);
  background: white;
  box-shadow: 0 0 0 4px rgba(11, 95, 255, 0.12);
}

.chat-page__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.chat-page__button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 0.8rem 1.25rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

.chat-page__button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.chat-page__button--primary {
  background: linear-gradient(180deg, #2f7bff, var(--brand));
  color: white;
  box-shadow: 0 10px 24px rgba(11, 95, 255, 0.22);
}

.chat-page__button--primary:hover:not(:disabled) {
  background: linear-gradient(180deg, #256fff, var(--brand-dark));
}

.chat-page__button--secondary {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.chat-page__button:disabled {
  opacity: 0.58;
  cursor: not-allowed;
  transform: none;
}

.chat-page__status {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 1.4rem;
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.chat-page__status--error {
  color: var(--error);
}

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

.chat-page__pulse {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 0 rgba(11, 95, 255, 0.45);
  animation: pulse 1.4s infinite;
}

.chat-page__answer-shell {
  position: relative;
  min-height: 14rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(247, 250, 255, 0.9), rgba(255, 255, 255, 0.96));
  padding: 1rem 1.05rem;
}

.chat-page__answer {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.65;
  font: inherit;
  color: var(--text);
}

.chat-page__answer--placeholder {
  color: var(--muted);
}

.chat-page__empty {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
}

.chat-page__empty strong {
  color: var(--text);
  font-size: 1rem;
}

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.login-shell {
  width: min(440px, 100%);
}

.login-card {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(213, 222, 234, 0.95);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 1.7rem;
}

.login-card__form {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.35rem;
}

.login-card__label {
  font-weight: 700;
}

.login-card__input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  font: inherit;
  background: #fbfcff;
}

.login-card__input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(11, 95, 255, 0.12);
  background: white;
}

.login-card__button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 0.9rem 1.2rem;
  margin-top: 0.35rem;
  font: inherit;
  font-weight: 700;
  color: white;
  cursor: pointer;
  background: linear-gradient(180deg, #2f7bff, var(--brand));
  box-shadow: 0 12px 28px rgba(11, 95, 255, 0.22);
}

.login-card__button:hover {
  background: linear-gradient(180deg, #256fff, var(--brand-dark));
}

.login-card__error,
.login-card__field-error {
  color: var(--error);
  font-size: 0.92rem;
}

.login-card__error {
  margin: 0;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(11, 95, 255, 0.45);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(11, 95, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(11, 95, 255, 0);
  }
}

@media (max-width: 640px) {
  .site-main {
    padding-top: 1.35rem;
  }

  .chat-page__panel,
  .login-card {
    padding: 1.1rem;
    border-radius: 20px;
  }

  .chat-page__label-row,
  .chat-page__answer-header {
    align-items: flex-start;
    flex-direction: column;
  }
}