/* =============================================
   小蓝白 · Global Stylesheet — Style C Warm Editorial
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg:          #faf9f6;
  --bg2:         #f3f1eb;
  --bg3:         #eceae2;
  --border:      #dedad0;
  --border2:     #ccc8bc;
  --text:        #1a1814;
  --text2:       #4a4540;
  --text3:       #8c8679;
  --text4:       #b0a99e;
  --accent:      #b45309;
  --accent-dk:   #92400e;
  --accent-lt:   #fef3c7;
  --accent-bg:   #fffbf2;
  --code-bg:     #f0ede5;
  --nav-h:       60px;
  --max-w:       1100px;
  --side-p:      48px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(250,249,246,0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--side-p);
  z-index: 200;
}
.nav-logo {
  font-family: 'EB Garamond', serif;
  font-size: 21px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.nav-links a {
  color: var(--text2);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 400;
  padding: 6px 12px;
  border-radius: 4px;
  letter-spacing: 0.2px;
  transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--text); background: var(--bg2); }
.nav-links a.active { color: var(--accent); }
.nav-links .nav-cta {
  background: var(--accent);
  color: white !important;
  padding: 6px 16px;
  border-radius: 4px;
  font-weight: 500;
  margin-left: 8px;
}
.nav-links .nav-cta:hover { background: var(--accent-dk); }

/* ── FOOTER ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 22px var(--side-p);
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-w);
  margin: 64px auto 0;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-logo {
  font-family: 'EB Garamond', serif;
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-beian {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-beian a {
  font-size: 12px;
  color: var(--text4);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: color .15s;
}
.footer-beian a:hover { color: var(--text3); }

/* ── PAGE WRAPPER ── */
.page-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--side-p);
}

/* ── RULED SECTION ── */
.ruled-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 72px var(--side-p);
  border-top: 1px solid var(--border);
}
.ruled-section-sm {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px var(--side-p);
  border-top: 1px solid var(--border);
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 44px;
  gap: 20px;
}
.section-num {
  font-family: 'EB Garamond', serif;
  font-size: 13px;
  color: var(--text4);
  font-style: italic;
  min-width: 28px;
}
.section-title {
  font-family: 'EB Garamond', serif;
  font-size: 34px;
  font-weight: 400;
  letter-spacing: -0.3px;
  flex-grow: 1;
}
.section-action {
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text3);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  white-space: nowrap;
  transition: color .15s, border-color .15s;
}
.section-action:hover { color: var(--accent); border-color: var(--accent); }

/* ── BUTTONS ── */
.btn {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  padding: 11px 26px;
  transition: background .15s, color .15s, opacity .15s;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-dk); }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: white; }
.btn-ghost {
  background: var(--bg2);
  color: var(--text2);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg3); }
.btn-sm { padding: 7px 16px; font-size: 12px; }
.btn-full { width: 100%; text-align: center; display: block; }

/* ── CODE ── */
code, .code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--accent-dk);
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 20px 24px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
}
pre code { background: none; padding: 0; border-radius: 0; color: inherit; font-size: inherit; }

/* ── FORM ELEMENTS ── */
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text2);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
textarea, input[type="text"], select {
  font-family: 'Inter', sans-serif;
  font-size: 13.5px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  outline: none;
  width: 100%;
  transition: border-color .15s;
  border-radius: 0;
  appearance: none;
}
textarea:focus, input[type="text"]:focus, select:focus {
  border-color: var(--accent);
}
textarea {
  resize: vertical;
  min-height: 100px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
}
.textarea-output {
  background: var(--bg2);
  cursor: default;
}

/* ── CHIP / TAG ── */
.chip {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 3px 9px;
}
.chip-accent { background: var(--accent); color: white; }
.chip-outline { border: 1px solid var(--border2); color: var(--text3); }
.chip-warm { background: var(--accent-lt); color: var(--accent-dk); }

/* ── UTILITIES ── */
.serif { font-family: 'EB Garamond', serif; }
.mono  { font-family: 'JetBrains Mono', monospace; }
.text3 { color: var(--text3); }
.text4 { color: var(--text4); }
.italic { font-style: italic; }
.mt4 { margin-top: 4px; }
.mt8 { margin-top: 8px; }
.mt16 { margin-top: 16px; }
.mt24 { margin-top: 24px; }
.mt32 { margin-top: 32px; }
hr.divider { border: none; border-top: 1px solid var(--border); }