/* Core reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #0C9488;
  --color-text: #1E1E1E;
  --color-background: #FFFFFF;
  --color-muted: #F7F7F8;
  --color-border: #E7E7EA;
  --color-warning: #FFCC66;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(3rem, 8vw, 6rem) 1.5rem 4rem;
}

.page__inner {
  width: min(960px, 100%);
}

.hero-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.logo {
  font-size: clamp(2.75rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-header__copy {
  font-size: clamp(1.25rem, 2.8vw, 1.6rem);
  max-width: 24rem;
  font-weight: 500;
}

.question-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 28px;
  padding: clamp(2rem, 5vw, 2.75rem);
  box-shadow: 0 18px 36px rgba(15, 20, 40, 0.05);
}

.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;
}

.question-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.question-form input {
  appearance: none;
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 1.15rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-muted);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.question-form input::placeholder {
  color: rgba(30, 30, 30, 0.48);
  font-weight: 400;
}

.question-form input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(12, 148, 136, 0.16);
  background-color: var(--color-background);
}

.form-footer {
  display: flex;
  align-items: stretch;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.suggestions {
  display: flex;
  flex: 1 1 auto;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.suggestion {
  border: 1px solid var(--color-border);
  background: var(--color-background);
  border-radius: 999px;
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.suggestion:hover,
.suggestion:focus {
  outline: none;
  border-color: rgba(12, 148, 136, 0.4);
  background-color: var(--color-muted);
  transform: translateY(-1px);
}

.submit-btn {
  border: none;
  border-radius: 999px;
  padding: 0.9rem 2.4rem;
  font-size: 1rem;
  font-weight: 600;
  color: #FFF;
  background-color: var(--color-primary);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  flex: 0 0 auto;
}

.submit-btn:hover,
.submit-btn:focus {
  outline: none;
  background-color: #08776d;
  transform: translateY(-2px);
  box-shadow: 0 14px 24px rgba(12, 148, 136, 0.22);
}

.form-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

.meta-warning {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(30, 30, 30, 0.7);
}

.warning-icon {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--color-warning);
  color: var(--color-text);
  font-size: 0.75rem;
  font-weight: 700;
}

.meta-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.meta-link:hover,
.meta-link:focus {
  text-decoration: underline;
}

.feedback {
  font-size: 0.9rem;
  margin-top: 1.25rem;
  display: none;
}

.feedback--error {
  color: #D14343;
}

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

.response-stream {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.response-stream:empty {
  display: none;
}

.user-message,
.bot-message {
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 1rem 1.25rem;
  font-size: 0.98rem;
  line-height: 1.5;
}

.user-message {
  background-color: var(--color-muted);
  align-self: flex-end;
  max-width: 80%;
}

.user-message p {
  white-space: pre-line;
}

.bot-message {
  background-color: var(--color-background);
  align-self: stretch;
  max-height: clamp(320px, 40vh, 420px);
  overflow-y: auto;
}

.message-content p {
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content ul,
.message-content ol {
  margin: 0.75rem 0 0.75rem 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.message-content strong {
  font-weight: 600;
}

.message-content a {
  color: var(--color-primary);
  text-decoration: underline;
  word-break: break-word;
}

.message-content em {
  font-style: italic;
}

.loading {
  opacity: 0.6;
  font-style: italic;
}

.about-section {
  padding: clamp(3rem, 8vw, 5rem) 1.5rem 4rem;
  background-color: var(--color-muted);
}

.about-section__inner {
  width: min(760px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}

.about-section h2 {
  font-size: 1.6rem;
  font-weight: 600;
}

.about-section p {
  font-size: 1.05rem;
  color: rgba(30, 30, 30, 0.78);
}

.footer {
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  font-size: 0.95rem;
  color: rgba(30, 30, 30, 0.6);
}

@media (max-width: 720px) {
  .hero-header {
    align-items: flex-start;
  }

  .hero-header__copy {
    max-width: 100%;
  }

  .form-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .submit-btn {
    width: 100%;
    justify-content: center;
  }

  .form-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .question-card {
    padding: 1.75rem;
  }

  .logo {
    font-size: 2.4rem;
  }

  .hero-header__copy {
    font-size: 1.1rem;
  }

  .suggestion {
    width: 100%;
    text-align: center;
  }
}