/* ============================================
   水無月紫苑 — Academic Style
   ============================================ */

:root {
  --bg-primary:    #0a0a0f;
  --bg-secondary:  #12121a;
  --bg-tertiary:   #1a1a24;
  --text-primary:  #e8e6e1;
  --text-secondary:#888;
  --accent-purple: #7c3aed;
  --accent-red:    #dc2626;
  --accent-gold:   #d4a574;
  --border-color:  #2a2a35;

  --font-zh:     "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-ja:     "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-en:     "Georgia", "Times New Roman", serif;
  --font-mincho: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", "游明朝", "MS Mincho", serif;
  --font-sans:   var(--font-zh);
}

:lang(zh) { --font-sans: var(--font-zh); }
:lang(ja) { --font-sans: var(--font-ja); }
:lang(en) { --font-sans: var(--font-en); }

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection { background: var(--accent-purple); color: white; }

/* ============================================
   Typography
   ============================================ */

h2 {
  font-family: var(--font-mincho);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

h3 {
  font-family: var(--font-mincho);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin: 3rem 0 1rem;
}

p { margin-bottom: 1.25rem; line-height: 1.8; }

a { color: var(--text-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-purple); }

ul { list-style: none; padding: 0; margin: 1.25rem 0; }
ul li { margin-bottom: 0.75rem; padding-left: 1.25rem; position: relative; }
ul li::before { content: '—'; position: absolute; left: 0; color: var(--accent-red); font-weight: 300; }
ul li a { color: var(--accent-gold); }
ul li a:hover { color: var(--accent-purple); }

blockquote {
  border-left: 2px solid var(--accent-purple);
  padding-left: 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin: 1.5rem 0;
}

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

code {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.85em;
  background: var(--bg-secondary);
  padding: 0.15em 0.4em;
  border-radius: 2px;
}

/* ============================================
   站名区域
   ============================================ */

.site-header-top {
  background: var(--bg-primary);
  padding: 1.6rem 2rem 1.2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.site-title { display: inline-block; }

.site-title a {
  font-family: var(--font-mincho);
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-primary);
  display: block;
  position: relative;
}

.site-title a::after {
  content: '';
  position: absolute;
  bottom: -0.3rem;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-purple);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-title a:hover { color: var(--text-primary); }
.site-title a:hover::after { transform: scaleX(1); }

/* ============================================
   导航栏
   ============================================ */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  height: 3rem;
  display: flex;
  align-items: center;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

nav a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  position: relative;
  transition: color 0.2s;
}

nav a:hover { color: var(--text-primary); }

nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--accent-red);
  transition: width 0.15s ease;
}

nav a:hover::after { width: 100%; }

/* ============================================
   Dropdown
   ============================================ */

.dropdown {
  position: relative;
  padding-bottom: 1rem;
  margin-bottom: -1rem;
}

.dropbtn { cursor: pointer; user-select: none; }
.dropbtn::after { content: ' ▾'; font-size: 0.7em; opacity: 0.6; }

.dropdown-content {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%) translateY(-5px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  min-width: 160px;
  padding: 0.5rem 0;
  border-radius: 2px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s linear 0.15s, opacity 0.15s, transform 0.15s;
  pointer-events: none;
}

.dropdown:hover .dropdown-content {
  visibility: visible; opacity: 1;
  transform: translateX(-50%) translateY(0);
  transition-delay: 0s;
  pointer-events: auto;
}

.dropdown::after {
  content: '';
  position: absolute;
  top: 100%; left: 0; right: 0;
  height: 1rem;
  background: transparent;
}

.dropdown-content a {
  display: block;
  padding: 0.6rem 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all 0.15s;
}

.dropdown-content a:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding-left: 1.5rem;
}

/* ============================================
   Language Switcher
   ============================================ */

.lang-switcher {
  position: absolute;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
}

.lang-switcher-inner {
  position: relative;
  padding-bottom: 1rem;
  margin-bottom: -1rem;
}

.lang-current {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  font-size: 0.8rem;
  border-radius: 2px;
  transition: all 0.15s;
  user-select: none;
  white-space: nowrap;
}

.lang-switcher-inner:hover .lang-current {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

.lang-current .arrow {
  font-size: 0.6rem;
  transition: transform 0.2s;
}

.lang-switcher-inner:hover .arrow { transform: rotate(180deg); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  min-width: 130px;
  padding: 0.25rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-5px);
  transition: visibility 0s linear 0.15s, opacity 0.15s, transform 0.15s;
  pointer-events: none;
}

.lang-switcher-inner:hover .lang-dropdown {
  visibility: visible; opacity: 1;
  transform: translateY(0);
  transition-delay: 0s;
  pointer-events: auto;
}

.lang-switcher-inner::after {
  content: '';
  position: absolute;
  top: 100%; left: 0; right: 0;
  height: 1rem;
  background: transparent;
}

.lang-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.6rem 0.9rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.82rem;
  text-align: left;
  border-radius: 2px;
  transition: all 0.1s;
}

.lang-option:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.lang-option.active { color: var(--accent-purple); font-weight: 500; }
.lang-option .check { opacity: 0; font-size: 0.75rem; }
.lang-option.active .check { opacity: 1; }

/* ============================================
   Main / Sections
   ============================================ */

main {
  max-width: 700px;
  margin: 0 auto;
  padding: 2.5rem 2rem 5rem;
  flex: 1;
  width: 100%;
}

section { margin-bottom: 2.5rem; }

/* 问候板块左紫线 */
section:nth-of-type(2) div[data-lang="zh"] p,
section:nth-of-type(2) div[data-lang="ja"] p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent-purple);
  margin-bottom: 1.25rem;
}

/* ============================================
   Post List（首页最近更新 / 各列表页）
   ============================================ */

.post-list { display: flex; flex-direction: column; }

.post-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border-color);
}

.post-item:first-child { border-top: 1px solid var(--border-color); }

.post-meta { display: flex; align-items: center; gap: 0.75rem; }

.post-date {
  font-size: 0.78rem;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

.post-tag {
  font-size: 0.72rem;
  color: var(--accent-purple);
  border: 1px solid var(--accent-purple);
  padding: 0.1rem 0.5rem;
  border-radius: 1px;
  letter-spacing: 0.05em;
}

.post-title {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
  display: block;
  transition: color 0.15s;
}

.post-title:hover { color: var(--accent-purple); }

/* ============================================
   Article Page（文章正文）
   ============================================ */

.article-header { margin-bottom: 2.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border-color); }

.article-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }

.article-title {
  font-family: var(--font-mincho);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1.4;
  color: var(--text-primary);
}

.article-body { font-size: 0.97rem; line-height: 1.9; }

.article-body h2 { font-size: 1.05rem; margin-top: 2.5rem; }
.article-body h3 { font-size: 0.97rem; margin-top: 1.8rem; }
.article-body p { margin-bottom: 1.3rem; color: var(--text-secondary); }
.article-body p:first-child { color: var(--text-primary); }

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  transition: color 0.15s;
}

.article-back:hover { color: var(--accent-purple); }

/* ============================================
   Policy 政见放送
   ============================================ */

/* 政策导言 — 紫线格式，同主页问候 */
.policy-intro p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent-purple);
  margin-bottom: 1.25rem;
  line-height: 1.8;
}

/* 政策主张大标题居中 */
.policy-section-title {
  text-align: center;
  margin-bottom: 0.5rem;
}

/* h3板块标题比policy-item-title大一档 */
.policy-section h3 {
  font-family: var(--font-mincho);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 3rem 0 1rem;
  color: var(--text-primary);
}

.policy-list { display: flex; flex-direction: column; }

.policy-item {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border-color);
}

.policy-item:first-child { border-top: 1px solid var(--border-color); }

.policy-item-title {
  font-family: var(--font-mincho);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.policy-item-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin: 0;
}

/* ============================================
   Language Content Visibility
   ============================================ */

[data-lang] { display: none; animation: fadeIn 0.25s ease; }
[data-lang].active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Footer
   ============================================ */

footer {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-top: auto;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .site-header-top { padding: 1.2rem 1rem 1rem; }
  .site-title a { font-size: 1.5rem; }

  header {
    padding: 0 1rem;
    height: auto;
    min-height: 2.75rem;
    flex-wrap: wrap;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }

  .main-nav {
    position: static;
    transform: none;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
  }

  .lang-switcher {
    position: static;
    transform: none;
    margin-left: auto;
  }

  main { padding: 1.5rem 1rem 3rem; }
}

/* ============================================
   Scrollbar
   ============================================ */

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-purple); }