:root {
  --teal-dark: #0e7872;
  --teal-mid: #2ecac4;
  --teal-pale: #e6faf9;
  --coral: #ff8c6b;
  --coral-pale: #fff3ef;
  --gradient: linear-gradient(135deg, #2ecac4 0%, #ff8c6b 100%);
  --text-dark: #0d2e2c;
  --text-mid: #3a5e5c;
  --text-light: #6a9090;
  --bg-light: #f2fafa;
  --white: #ffffff;
  --border: #d8ecea;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  color: var(--text-dark);
  background: var(--bg-light);
  line-height: 1.65;
}

a {
  color: var(--teal-dark);
}

/* Top bar + breadcrumb */
.skill-topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1rem 1.5rem;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.skill-topbar__brand {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.skill-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-light);
}

.skill-breadcrumb a {
  color: var(--text-mid);
  text-decoration: none;
}

.skill-breadcrumb a:hover {
  color: var(--teal-dark);
  text-decoration: underline;
}

.skill-breadcrumb__current {
  color: var(--text-dark);
  font-weight: 600;
}

/* Main layout */
.skill-main {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Action buttons */
.skill-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}

.skill-actions__label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-left: 0.4rem;
}

.skill-btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: 8px;
  border: 1px solid var(--teal-mid);
  background: var(--white);
  color: var(--teal-dark);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.05s;
}

.skill-btn:hover {
  background: var(--teal-pale);
}

.skill-btn:active {
  transform: translateY(1px);
}

.skill-btn--claude {
  border-color: var(--coral);
  color: #b5482c;
}

.skill-btn--claude:hover {
  background: var(--coral-pale);
}

.skill-btn--chatgpt {
  border-color: var(--teal-dark);
}

/* Rendered skill content */
.skill-content {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  padding: 2.25rem 2.5rem;
}

.skill-content h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}

.skill-content h2 {
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--teal-pale);
  color: var(--teal-dark);
}

.skill-content h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--text-dark);
}

.skill-content p,
.skill-content ul,
.skill-content ol,
.skill-content blockquote,
.skill-content table {
  margin-bottom: 1rem;
}

.skill-content ul,
.skill-content ol {
  padding-left: 1.5rem;
}

.skill-content li {
  margin-bottom: 0.35rem;
}

.skill-content blockquote {
  border-left: 4px solid var(--teal-mid);
  background: var(--teal-pale);
  padding: 0.75rem 1rem;
  border-radius: 0 8px 8px 0;
  color: var(--text-mid);
}

.skill-content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.88em;
  background: var(--bg-light);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.skill-content pre {
  background: #0d2e2c;
  color: #e6faf9;
  padding: 1rem 1.25rem;
  border-radius: 10px;
  overflow-x: auto;
  margin-bottom: 1rem;
}

.skill-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.skill-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.skill-content th,
.skill-content td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.skill-content th {
  background: var(--teal-pale);
  font-weight: 600;
}

.skill-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.skill-content a {
  color: var(--teal-dark);
  word-break: break-word;
}

/* Footer */
.skill-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-light);
}

.skill-footer a {
  color: var(--teal-dark);
  text-decoration: none;
  font-weight: 600;
}

.skill-footer a:hover {
  text-decoration: underline;
}

/* Index page */
.index-title {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.index-sub {
  color: var(--text-mid);
  margin-bottom: 2.5rem;
}

.index-region {
  margin-bottom: 2.5rem;
}

.index-region h2 {
  font-size: 1.4rem;
  color: var(--teal-dark);
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--teal-pale);
}

.index-list {
  list-style: none;
  display: grid;
  gap: 1rem;
}

.index-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.3rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s, box-shadow 0.1s;
}

.index-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.index-item__link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-dark);
  text-decoration: none;
}

.index-item__link:hover {
  color: var(--teal-dark);
}

.index-item__desc {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-mid);
}

@media (max-width: 600px) {
  .skill-content {
    padding: 1.5rem 1.25rem;
  }
  .skill-main {
    padding: 1.5rem 1rem 3rem;
  }
}