/* ==============================
   Responsive layout for tongxiaofeng.com
   ============================== */

/* --- Base typography --- */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-weight: 400;
  color: #2c2c2c;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* --- Navigation --- */
nav {
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06) !important;
}

nav .brand-logo {
  font-size: 1.4rem !important;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* --- Article content page --- */
.article-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.article-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.5rem;
  color: #1a1a1a;
}

.article-header .article-meta {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #eee;
}

.article-header .article-meta-published-at {
  font-size: 0.95rem;
}

/* --- Article body --- */
.article-body {
  font-size: 1.08rem;
  line-height: 1.9;
}

.article-body p {
  margin-bottom: 1.4em;
  text-align: justify;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 3rem;
  margin-bottom: 1.2rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #e8e8e8;
  color: #1a1a1a;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: #1a1a1a;
}

.article-body h4 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
}

.article-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem auto;
  border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.article-body blockquote {
  border-left: 4px solid #1a73e8;
  margin: 1.8em 0;
  padding: 0.8em 1.2em;
  background: #f8f9fa;
  color: #444;
  font-style: normal;
}

.article-body blockquote p {
  margin-bottom: 0.5em;
}

.article-body blockquote p:last-child {
  margin-bottom: 0;
}

.article-body code {
  background: #f1f3f5;
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

.article-body pre {
  background: #282c34;
  color: #abb2bf;
  padding: 1.2em 1.5em;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 1.8em 0;
}

.article-body pre code {
  background: none;
  padding: 0;
  font-size: 0.88em;
}

.article-body strong {
  font-weight: 600;
  color: #1a1a1a;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95rem;
}

.article-body th,
.article-body td {
  border: 1px solid #e0e0e0;
  padding: 0.6em 1em;
  text-align: left;
}

.article-body th {
  background: #f5f5f5;
  font-weight: 600;
}

.article-body hr {
  border: none;
  border-top: 1px solid #e8e8e8;
  margin: 2.5rem 0;
}

.article-body ol,
.article-body ul {
  padding-left: 1.8em;
  margin-bottom: 1.4em;
}

.article-body li {
  margin-bottom: 0.4em;
}

/* --- Summary list (homepage) --- */
.article-summary {
  max-width: 780px;
  margin: 0 auto;
  padding: 1.8rem 1.5rem;
  border-bottom: 1px solid #f0f0f0;
}

.article-summary h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  line-height: 1.4;
}

.article-summary h3 a {
  color: #1a1a1a;
  transition: color 0.15s;
}

.article-summary h3 a:hover {
  color: #1a73e8;
}

.article-summary-meta {
  margin-bottom: 0.6rem;
}

.article-summary-text {
  color: #555;
  line-height: 1.75;
  font-size: 1rem;
}

/* --- Paginator --- */
.paginator-container {
  max-width: 780px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

/* --- Footer --- */
.page-footer {
  margin-top: 2rem;
}

/* --- Responsive: large screens (1200px+) --- */
@media (min-width: 1200px) {
  .article-content {
    max-width: 820px;
  }

  .article-summary {
    max-width: 820px;
  }

  .article-header h1 {
    font-size: 2.5rem;
  }

  .article-body {
    font-size: 1.1rem;
  }
}

/* --- Responsive: extra large screens (1600px+) --- */
@media (min-width: 1600px) {
  .article-content {
    max-width: 860px;
  }

  .article-summary {
    max-width: 860px;
  }

  .article-body {
    font-size: 1.12rem;
    line-height: 1.95;
  }
}

/* --- Responsive: tablet (601px - 992px) --- */
@media (max-width: 992px) {
  .article-content {
    padding: 1.5rem 1.2rem 3rem;
  }

  .article-header h1 {
    font-size: 1.9rem;
  }

  .article-body {
    font-size: 1.05rem;
  }

  .article-body h2 {
    font-size: 1.45rem;
  }

  .article-summary h3 {
    font-size: 1.35rem;
  }
}

/* --- Responsive: mobile (600px and below) --- */
@media (max-width: 600px) {
  .article-content {
    padding: 1rem 1rem 2.5rem;
  }

  .article-header h1 {
    font-size: 1.6rem;
    line-height: 1.4;
  }

  .article-body {
    font-size: 1rem;
    line-height: 1.85;
  }

  .article-body h2 {
    font-size: 1.3rem;
    margin-top: 2.5rem;
  }

  .article-body h3 {
    font-size: 1.15rem;
  }

  .article-body img {
    margin: 1.5rem auto;
    border-radius: 2px;
  }

  .article-body blockquote {
    margin-left: 0;
    margin-right: 0;
    padding: 0.6em 1em;
  }

  .article-summary {
    padding: 1.2rem 1rem;
  }

  .article-summary h3 {
    font-size: 1.25rem;
  }

  nav .brand-logo {
    font-size: 1.2rem !important;
  }
}

/* ==============================
   Landing page
   ============================== */
.landing-hero {
  padding: 70px 0 40px;
  min-height: calc(100vh - 130px);
}

.landing-photo-wrapper {
  margin-bottom: 24px;
}

.landing-photo {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
  border: 3px solid #fff;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
}

.landing-name {
  font-size: 2.2rem;
  font-weight: 700;
  color: #1a1a1a;
  margin: 0;
  letter-spacing: 0.08em;
}

.landing-name-en {
  font-size: 1rem;
  color: #888;
  margin: 6px 0 0;
  font-weight: 400;
  letter-spacing: 0.03em;
}

.landing-tagline-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 14px;
  font-size: 0.9rem;
  color: #aaa;
  letter-spacing: 0.08em;
}

.landing-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #ccc;
  display: inline-block;
}

.landing-cards {
  margin-top: 48px;
}

.landing-card {
  background: #fff;
  border-radius: 12px;
  padding: 30px 28px;
  box-shadow: 0 1px 8px rgba(0,0,0,0.04);
  border: 1px solid #eee;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s;
}

.landing-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.landing-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.landing-card-flag {
  font-size: 1.2rem;
}

.landing-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1a1a1a;
  margin: 0;
}

.landing-card p {
  font-size: 0.95rem;
  color: #666;
  line-height: 1.75;
  flex: 1;
}

.landing-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.landing-btn {
  background-color: #1a1a1a !important;
  border-radius: 8px !important;
  text-transform: none !important;
  font-size: 0.88rem !important;
  height: 36px !important;
  line-height: 36px !important;
  padding: 0 22px !important;
  letter-spacing: 0.02em !important;
  box-shadow: none !important;
}

.landing-btn:hover {
  background-color: #333 !important;
}

.landing-link-text {
  font-size: 0.9rem;
  color: #666;
  text-decoration: none;
  transition: color 0.2s;
}

.landing-link-text:hover {
  color: #1a1a1a;
}

/* Section title with lines */
.landing-section-title {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 40px 0 20px;
}

.landing-section-title h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #999;
  margin: 0;
  white-space: nowrap;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.landing-section-line {
  flex: 1;
  height: 1px;
  background: #e8e8e8;
}

.landing-writings-grid {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.landing-writing-item {
  flex: 1;
  min-width: 250px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  background: #fafafa;
  border-radius: 10px;
  border: 1px solid #eee;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.15s;
  text-decoration: none;
}

.landing-writing-item:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  border-color: #ddd;
  transform: translateY(-1px);
}

.landing-writing-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.landing-writing-title {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 4px;
}

.landing-writing-desc {
  display: block;
  font-size: 0.85rem;
  color: #999;
  line-height: 1.5;
}

/* ==============================
   Footer social links
   ============================== */
.footer-social {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: #555;
  transition: color 0.2s, background 0.2s;
}

.footer-social a:hover {
  color: #1a1a1a;
  background: #e8e8e8;
}

.footer-wechat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #555;
  padding: 8px 0;
}

.footer-wechat svg {
  flex-shrink: 0;
}

.footer-wechat-text {
  font-size: 0.85rem;
  color: #777;
}

@media (max-width: 600px) {
  .landing-hero {
    padding: 40px 0 20px;
  }

  .landing-photo {
    width: 100px;
    height: 100px;
  }

  .landing-name {
    font-size: 1.7rem;
  }

  .landing-name-en {
    font-size: 0.9rem;
  }

  .landing-cards {
    margin-top: 28px;
  }

  .landing-card {
    padding: 22px 18px;
    min-height: auto;
    margin-bottom: 14px;
  }

  .landing-writings-grid {
    flex-direction: column;
  }

  .landing-writing-item {
    min-width: auto;
  }

  .landing-section-title h4 {
    font-size: 0.82rem;
  }
}