/* Navigation */
.nav {
  position: fixed;
  top: 0; left: 0;
  width: 240px;
  height: 100vh;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  z-index: 50;
  transition: transform var(--transition);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  margin-bottom: 2rem;
}

.nav-logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: #fff; font-weight: 800;
  flex-shrink: 0;
}
.nav-logo-img {
  width: 36px; height: 36px; border-radius: 10px;
  object-fit: contain; flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(168,85,247,0.4));
}

.nav-logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-section-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 0.75rem;
  margin: 1rem 0 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav-item:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(168,85,247,0.12);
  color: var(--accent-purple);
}

.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }

.nav-bottom {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}
.nav-user:hover { background: var(--bg-card-hover); }
.nav-user-info { flex: 1; min-width: 0; }
.nav-user-name { font-size: 0.875rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-user-role { font-size: 0.75rem; color: var(--text-muted); }

/* Top bar (mobile) */
.topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  z-index: 50;
}

/* Theme & lang toggles */
.theme-toggle, .lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
}
.theme-toggle:hover, .lang-toggle:hover {
  color: var(--text-primary);
  border-color: var(--accent-purple);
}

.nav-controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

/* Lang dropdown */
.lang-dropdown {
  position: relative;
}
.lang-menu {
  position: absolute;
  bottom: calc(100% + 0.5rem);
  left: 0; right: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: none;
  z-index: 100;
}
.lang-menu.open { display: block; }
.lang-option {
  padding: 0.6rem 0.875rem;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background var(--transition);
  display: flex; align-items: center; gap: 0.5rem;
  /* 支持维吾尔文等多语言显示 */
  font-family: 'UKIJ Esliye', 'UKIJ Tor', 'Scheherazade New',
               'Inter', 'PingFang SC', 'Microsoft YaHei',
               'Helvetica Neue', sans-serif;
}
.lang-option:hover { background: var(--bg-card); color: var(--text-primary); }
.lang-option.active { color: var(--accent-purple); }

/* Layout with sidebar */
.layout {
  display: flex;
  min-height: 100vh;
}
.layout-content {
  margin-left: 240px;
  flex: 1;
  min-height: 100vh;
  padding: 2rem;
}

/* ── 维吾尔/哈萨克语 RTL 侧边栏适配 ── */
[dir="rtl"] .nav {
  left: auto;
  right: 0;
  border-right: none;
  border-left: 1px solid var(--border);
}
[dir="rtl"] .layout-content {
  margin-left: 0;
  margin-right: 240px;
}
[dir="rtl"] .nav-item {
  text-align: right;
  flex-direction: row-reverse;
}
[dir="rtl"] .lang-menu {
  left: auto;
  right: 0;
}
[dir="rtl"] .nav-user {
  flex-direction: row-reverse;
}

/* ── 平板（768px~1024px）侧边栏缩窄 ── */
@media (max-width: 1024px) and (min-width: 769px) {
  .nav {
    width: 200px;
  }
  .layout-content {
    margin-left: 200px;
  }
  [dir="rtl"] .layout-content {
    margin-left: 0;
    margin-right: 200px;
  }
  .nav-logo-text {
    font-size: 0.95rem;
  }
}

/* ── 手机（≤768px）── */
@media (max-width: 768px) {
  .nav {
    transform: translateX(-100%);
    width: 260px;
    /* 确保在所有手机上铺满可见侧边栏宽度 */
    box-shadow: var(--shadow-lg);
  }
  .nav.open { transform: translateX(0); }
  /* RTL下从右侧滑入 */
  [dir="rtl"] .nav {
    transform: translateX(100%);
    left: auto;
    right: 0;
    border-left: 1px solid var(--border);
    border-right: none;
  }
  [dir="rtl"] .nav.open {
    transform: translateX(0);
  }
  .topbar { display: flex; }
  .layout-content {
    margin-left: 0;
    margin-right: 0;
    padding: 1rem;
    padding-top: 4.5rem;
  }
  [dir="rtl"] .layout-content {
    margin-left: 0;
    margin-right: 0;
  }
  .nav-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(2px);
    z-index: 49;
    display: none;
  }
  .nav-overlay.open { display: block; }
}

/* ── 超小屏（≤375px）── */
@media (max-width: 375px) {
  .nav { width: 240px; padding: 1rem 0.75rem; }
  .layout-content { padding: 0.75rem; padding-top: 4.5rem; }
  .nav-logo { margin-bottom: 1.25rem; }
  .nav-item { font-size: 0.85rem; padding: 0.55rem 0.625rem; }
}

/* ── 横屏手机 ── */
@media (max-height: 500px) and (max-width: 900px) {
  .nav {
    overflow-y: auto;
    padding: 0.75rem;
  }
  .nav-logo { margin-bottom: 1rem; }
  .nav-section-label { margin: 0.5rem 0 0.25rem; }
}