* {
  box-sizing: border-box;
}

:root {
  --bg: #f5efe7;
  --bg-soft: #fcf8f2;
  --surface: rgba(255, 252, 247, 0.9);
  --surface-strong: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --line: #d8d1c7;
  --line-strong: #c6bcae;
  --primary: #286f95;
  --primary-strong: #1f5a79;
  --accent: #c62828;
  --add-bg: #e8f6ea;
  --add-text: #0d7a38;
  --remove-bg: #fdebec;
  --remove-text: #c62828;
  --shadow: 0 24px 60px rgba(48, 38, 30, 0.08);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(40, 111, 149, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(217, 119, 6, 0.08), transparent 22%),
    linear-gradient(180deg, #fbf7f1 0%, #f3ece1 100%);
  color: var(--text);
  font-family: "Malgun Gothic", "Apple SD Gothic Neo", Arial, sans-serif;
  font-size: 14px;
}

button,
textarea,
input {
  font: inherit;
}

.app-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 36px 20px 44px;
}

.hero {
  margin-bottom: 20px;
  padding: 6px 2px;
}

.hero__eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.hero__title {
  margin: 0;
  font-size: 32px;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.hero__description {
  max-width: 720px;
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.compare-form {
  width: 100%;
  padding: 26px 24px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.seo-content {
  margin-top: 22px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.info-card,
.faq-section {
  padding: 22px 24px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.info-card h2,
.faq-section h2,
.faq-item h3 {
  margin: 0;
  letter-spacing: -0.02em;
}

.info-card h2,
.faq-section h2 {
  font-size: 22px;
}

.faq-item h3 {
  font-size: 18px;
}

.info-card p,
.faq-item p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.info-list {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

.faq-section {
  margin-top: 20px;
}

.faq-list {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.faq-item {
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.76);
}

.form-row {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 18px;
  align-items: start;
  margin-bottom: 18px;
}

.form-row--actions {
  margin-bottom: 16px;
}

.form-label {
  padding-top: 12px;
  color: #2b2b2b;
  font-weight: 700;
  line-height: 1.4;
}

.form-label--empty {
  padding-top: 0;
}

.form-control {
  min-width: 0;
}

.view-switch {
  display: inline-flex;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
  vertical-align: top;
}

.view-switch__button,
.primary-button,
.utility-button,
.utility-link {
  border: 0;
  cursor: pointer;
  transition:
    transform 150ms ease,
    background-color 150ms ease,
    color 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease;
}

.view-switch__button {
  min-width: 96px;
  padding: 10px 16px;
  color: var(--muted);
  background: transparent;
  border-radius: 999px;
  font-weight: 700;
}

.view-switch__button.is-active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-strong) 100%);
  box-shadow: 0 8px 18px rgba(40, 111, 149, 0.24);
}

.editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

textarea {
  width: 100%;
  min-height: 230px;
  padding: 14px 16px;
  resize: vertical;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.88)),
    repeating-linear-gradient(
      180deg,
      transparent,
      transparent 31px,
      rgba(31, 35, 40, 0.025) 31px,
      rgba(31, 35, 40, 0.025) 32px
    );
  line-height: 1.6;
  letter-spacing: -0.01em;
  box-shadow: inset 0 1px 2px rgba(31, 35, 40, 0.03);
}

textarea:focus {
  border-color: rgba(40, 111, 149, 0.5);
  outline: 0;
  box-shadow:
    0 0 0 4px rgba(40, 111, 149, 0.12),
    inset 0 1px 2px rgba(31, 35, 40, 0.03);
}

.action-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.primary-button {
  padding: 11px 18px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-strong) 100%);
  border-radius: 12px;
  box-shadow: 0 12px 24px rgba(40, 111, 149, 0.18);
  font-weight: 700;
}

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

.utility-button,
.utility-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  color: var(--primary);
  border: 1px solid rgba(40, 111, 149, 0.16);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.utility-button {
  position: relative;
}

.utility-button input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.utility-link:hover,
.utility-button:hover {
  color: var(--primary-strong);
  border-color: rgba(40, 111, 149, 0.28);
  background: rgba(255, 255, 255, 0.95);
}

.status-text {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.result-section {
  min-width: 0;
}

.split-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.result-box {
  min-height: 72px;
  max-height: 290px;
  padding: 14px 16px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 246, 241, 0.96));
  box-shadow: inset 0 1px 1px rgba(31, 35, 40, 0.02);
}

.result-box--unified {
  white-space: pre-wrap;
}

.result-line,
.split-line {
  min-height: 22px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.7;
  color: #111111;
  letter-spacing: -0.01em;
}

.split-line--empty {
  color: transparent;
}

.empty-state {
  color: #9a8f82;
}

.inline {
  display: inline;
  padding: 0 1px;
  border-radius: 2px;
  text-decoration: none;
}

.inline--add {
  background: var(--add-bg);
  color: var(--add-text);
}

.inline--remove {
  background: var(--remove-bg);
  color: var(--remove-text);
  text-decoration: line-through;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

@media (max-width: 860px) {
  .app-shell {
    padding: 24px 14px 32px;
  }

  .hero__title {
    font-size: 28px;
  }

  .compare-form {
    padding: 20px 16px;
    border-radius: 20px;
  }

  .editor-grid,
  .info-grid,
  .split-results {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .form-row {
    grid-template-columns: 1fr;
    row-gap: 8px;
  }

  .form-label {
    padding-top: 0;
  }
}