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

:root {
  --bg: #F8F7F4;
  --white: #FFFFFF;
  --text: #111111;
  --text-secondary: #666666;
  --border: #E5E5E0;
  --generative-bg: #F0EDE8;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

header {
  padding: 24px 40px;
  border-bottom: 1px solid var(--border);
  background: var(--white);
}

.wordmark {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

main {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 40px;
  width: 100%;
}

.intro {
  margin-bottom: 40px;
}

.intro h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
  line-height: 1.2;
}

.intro p {
  color: var(--text-secondary);
  font-size: 16px;
}

.confidentiality {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.input-section {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 48px;
}

textarea {
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: transparent;
  padding: 20px;
}

textarea::placeholder {
  color: #BBBBBB;
}

.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

.char-count {
  font-size: 12px;
  color: var(--text-secondary);
}

button {
  background: var(--text);
  color: var(--white);
  border: none;
  border-radius: 4px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 24px;
  cursor: pointer;
  transition: opacity 0.15s;
}

button:hover {
  opacity: 0.75;
}

button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.hidden {
  display: none;
}

.loading {
  text-align: center;
  padding: 40px 0;
  color: var(--text-secondary);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.problem-summary {
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border-left: 3px solid var(--text-secondary);
  padding: 12px 16px;
  border-radius: 4px;
  margin-bottom: 28px;
  line-height: 1.5;
}

.summary-hint {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: -20px;
  margin-bottom: 28px;
}

.summary-hint a {
  color: var(--text-secondary);
  text-decoration: underline;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.generative-heading {
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.lens-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 10px;
}

.lens-name {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 6px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.lens-rank {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.lens-rationale {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
}

.generative-card {
  background: var(--generative-bg);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 10px;
}

.generative-tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  font-weight: 400;
}

.generative-card--expertise {
  background: #EEE8F0;
}

.gap-type-badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 3px;
}

.gap-type-badge--knowledge {
  background: #E0EBE4;
  color: #2D6A4F;
}

.gap-type-badge--expertise {
  background: #DDD5E8;
  color: #5C3D7A;
}

.email-section {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.email-section h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.email-section > p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

.email-form {
  display: flex;
  gap: 10px;
}

.email-form input[type="email"] {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 16px;
  font-family: var(--font);
  font-size: 14px;
  background: var(--white);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.email-form input[type="email"]:focus {
  border-color: var(--text);
}

.consent-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  line-height: 1.5;
}

.consent-label input[type="checkbox"] {
  margin-top: 2px;
  flex-shrink: 0;
  cursor: pointer;
}

.email-feedback {
  margin-top: 12px;
  font-size: 14px;
}

.email-feedback.success { color: #2D6A4F; }
.email-feedback.error { color: #B00020; }

.privacy-notice {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.privacy-notice a {
  color: var(--text-secondary);
}

footer {
  padding: 24px 40px;
  border-top: 1px solid var(--border);
  background: var(--white);
}

footer p {
  font-size: 12px;
  color: var(--text-secondary);
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

@media (max-width: 600px) {
  header { padding: 20px; }
  main { padding: 40px 20px; }
  footer { padding: 20px; }
  .intro h1 { font-size: 26px; }
  .email-form { flex-direction: column; }
}