/* ===== 欢乐AI 统一顶部导航 ===== */

/* 基础结构 */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:#FFFFFF;border-bottom:1px solid #E5E5E5;display:flex;justify-content:center}
.nav-inner{width:100%;max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 16px;height:56px}

/* Logo - 橙色 */
.nav-logo{text-decoration:none;display:flex;align-items:center;gap:8px;font-size:19px;font-weight:700;color:#F59E0B;flex-shrink:0}
.nav-logo .logo-icon{width:32px;height:32px;background:linear-gradient(135deg,#F59E0B,#FF8C42);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff;font-weight:700;flex-shrink:0}

/* 导航链接 - 深灰色文字，橙色下划线高亮 */
.nav-links{display:flex;list-style:none;gap:2px;margin:0;padding:0;flex-shrink:0}
.nav-links li{position:relative;display:flex;align-items:center}
.nav-links a{text-decoration:none;color:#444;font-size:15px;font-weight:500;padding:8px 16px;transition:all .2s;display:block;white-space:nowrap}
.nav-links a:hover{color:#F59E0B}
.nav-links li.active a{color:#10B981;font-weight:600;background:transparent}
.nav-links li.active::after{content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:24px;height:3px;background:#10B981;border-radius:3px 3px 0 0}

/* 右侧按钮区 */
.nav-right{display:flex;align-items:center;gap:12px;flex-shrink:0}

/* 椭圆橙色登录按钮 */
.nav-login{text-decoration:none;color:#F59E0B;font-size:14px;font-weight:600;padding:8px 22px;border:1px solid #E8E8E8;border-radius:20px;background:#F5F5F5;transition:all .25s;white-space:nowrap;display:inline-block;box-shadow:none;flex-shrink:0}
.nav-login:hover{background:#FFF8E1;border-color:#F59E0B;transform:translateY(-1px);box-shadow:0 2px 8px rgba(245,158,11,.15);color:#F59E0B}

/* 用户信息 */
.nav-user{display:flex;align-items:center;gap:8px;font-size:14px;color:#333;cursor:pointer}
.avatar2{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#F59E0B,#FF8C42);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}
.vip-badge{font-size:10px;padding:2px 6px;border-radius:10px;background:linear-gradient(135deg,#F59E0B,#FF8C42);color:#fff;font-weight:700}
.nav-user-wrap{position:relative}
.nav-user-wrap button{background:none;border:none;font-size:12px;color:#999;cursor:pointer;padding:4px}
.user-dropdown{display:none;position:absolute;top:100%;right:0;background:#fff;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,.12);min-width:140px;padding:4px;z-index:1001}
.user-dropdown.show{display:block}
.user-dropdown a{display:block;padding:10px 16px;font-size:14px;color:#333;text-decoration:none;border-radius:8px;transition:background .15s}
.user-dropdown a:hover{background:#FFF8E1;color:#F59E0B}

/* 汉堡菜单按钮 */
.hamburger{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:4px;z-index:1001;flex-shrink:0}
.hamburger span{display:block;width:22px;height:2px;background:#333;border-radius:2px;transition:all .2s}

/* ===== 响应式 ===== */

/* 桌面端 (>=900px)：完整横向导航 */
@media(min-width:900px){
  .hamburger{display:none !important}
  .nav{display:flex !important}
  .nav-inner{flex-direction:row !important;flex-wrap:nowrap !important}
  .nav-links{display:flex !important;position:static;flex-direction:row;background:none;box-shadow:none;padding:0;gap:2px}
  .nav-links li.active::after{display:block}
  .nav-links li.active a{background:none}
}

/* 平板/手机 (<900px)：汉堡菜单 */
@media(max-width:899px){
  .hamburger{display:flex}
  .nav-links{display:none;position:absolute;top:56px;right:0;background:#fff;box-shadow:0 4px 20px rgba(0,0,0,.12);border-radius:0 0 12px 12px;flex-direction:column;padding:8px 0;min-width:180px;z-index:1000}
  .nav-links.show{display:flex}
  .nav-links a{padding:12px 24px;font-size:15px}
  .nav-links li.active::after{display:none}
  .nav-links li.active a{background:#FFF7ED}
}

/* 汉堡菜单切换JS（页面内联） */